JP4976182B2 - Cable assembly - Google Patents

Description

  The present invention relates to a cable assembly used for an active headrest device of a vehicle, for example.

  During driving, a gap is often interposed between the head of the occupant and the headrest. When the vehicle is collided, the active headrest device quickly drives the headrest forward. And the clearance gap between a passenger | crew's head and a headrest is narrowed. For this reason, when an active headrest apparatus is used, a passenger | crew's head or neck can be protected from the impact at the time of a rear-end collision.

For example, in Patent Documents 1 and 2, an active movement for driving the headrest forward by driving the headrest frame and the headrest support bracket built in the seat back upward by using the rearward movement load of the occupant's waist generated at the time of the vehicle rear-end collision as an input. Headrest device is introduced.
JP 2006-7830 A JP 2006-7832 A JP-A-10-81162

  In the case of the active headrest device described in Patent Literatures 1 and 2, the headrest is driven via the headrest frame and the headrest support bracket. For this reason, not only the headrest but also the headrest frame and the headrest support bracket must be movable parts. This complicates the structure of the headrest frame and the headrest support bracket, and thus the structure of the seat back.

  The headrest frame and the headrest support bracket are made of metal and are relatively heavy. Since the headrest frame and the headrest support bracket, which are heavy objects, need to be moved upward against gravity, in the case of the active headrest device described in Patent Documents 1 and 2, it is difficult to ensure the speed of operation.

  In this regard, Patent Document 3 introduces an active headrest device that drives only a headrest. The headrest described in Patent Document 3 incorporates an extrusion device for extruding a part thereof forward. On the other hand, a drive device is mounted below the seat cushion. The drive device and the extrusion device are connected by a control cable. The control cable is routed inside the seat back and inside the headrest stay. As the drive piston moves, the inner cable of the control cable is pulled. The extrusion device is driven by the tension.

  In the case of the active headrest device described in Patent Document 3, it is not necessary to drive the headrest frame or the headrest support bracket. For this reason, the structure inside the seat back can be simplified. In addition, it is easy to ensure the speed of operation.

  However, the control cable is routed inside the headrest stay. For this reason, the headrest stay cannot be separated from the headrest support bracket. That is, the headrest cannot be removed from the seat back. Therefore, in the case of the active headrest device of Patent Document 3, the versatility is lacking, and the types of vehicles that can be employed are limited.

  The cable assembly of the present invention has been completed in view of the above problems. Therefore, an object of the present invention is to provide a cable assembly in which a detachable member can be arranged in a part of a power transmission path.

  (1) In order to solve the above problems, a cable assembly according to the present invention seals a cylindrical side wall portion having a pair of slits extending in the axial direction and one axial end of the side wall portion, and a counterpart member. A head member having a top wall portion disposed adjacent to the opening portion, an opening portion opened at the other axial end of the side wall portion and connected to an open end of the pair of slits, and the side wall through the opening portion. Including a bottom member having an insertion portion inserted on the inner diameter side of the portion, a cable insertion hole penetrating in the axial direction, and a section facing the insertion portion in the radial direction on the outer diameter side of the side wall portion. A casing cap having an annular member to be disposed; a cylindrical outer casing having an output side end fixed to the bottom member; and being inserted into the outer casing so as to be reciprocally movable in an axial direction. Each phase passes through the cable insertion hole and passes through the pair of slits. And a control cable having an output side end portion having a pair of branch ends inserted so as to be reciprocally movable in the axial direction, and by applying tension to the inner cable, the outer cable is provided. An axial compressive force is generated in the casing, the output side end portion of the outer casing is driven by a reaction force of the axial compressive force, and the counterpart member is moved by the top wall portion of the casing cap. (Corresponding to claim 1). Here, the “annular” of the annular member is a concept including an endless ring (as an example, an O-ring shape) as well as an endless ring (as an example, a C ring shape).

  When the load is transmitted by transmitting the tension as in the above-mentioned Patent Document 3, the cable for transmitting the tension (in the case of Patent Document 3, the inner cable) needs to be integrated. For this reason, a detachable member cannot be arranged in a part of the power transmission path.

  On the other hand, in the case of the cable assembly of the present invention, the mating member is moved not by tension but by transmission of pressing force. For this reason, among the outer casing, the casing cap, and the counterpart member constituting the power transmission path, the casing cap and the counterpart member are separate. Therefore, the casing cap and the counterpart member can be arranged on separate members. For this reason, the member in which the casing cap is disposed and the member in which the counterpart member is disposed can be separated at times other than during power transmission. Thus, according to the cable assembly of the present invention, a detachable member can be disposed in a part of the power transmission path.

  Further, according to the cable assembly of the present invention, the pressing force is transmitted not by the inner cable but by the outer casing. The outer casing has a larger diameter than the inner cable. For this reason, even when an axial compression force is applied from the casing cap to the outer casing when pressing the mating member, the outer casing is unlikely to be compressed and buckled. Therefore, it is possible to reliably transmit the pressing force.

  According to the cable assembly of the present invention, the pair of slits both reach the opening. For this reason, the pair of branch ends of the inner cable can be inserted into the pair of slits of the casing cap, respectively, very easily without applying an excessive load on the casing cap or the inner cable. Therefore, assembly work is easy. Moreover, there is little possibility that damage will remain to a casing cap or an inner cable by an assembly | attachment operation | work.

  Further, according to the cable assembly of the present invention, the opening side portion of the side wall portion of the head member has a diameter due to the insertion portion of the bottom member arranged on the inner diameter side and the annular member arranged on the outer diameter side. Sandwiched in the direction. For this reason, the open ends of the pair of slits can be reliably sealed. Therefore, it is possible to suppress the branch end of the inner cable from dropping from the slit via the open end.

  In general, in the case of a bottomed cylindrical member, the opening side has lower rigidity than the bottom side. In this respect, also in the case of the head member of the cable assembly of the present invention, the opening side is less rigid than the top wall side. In addition, in the case of the head member, since the pair of slits are connected to the opening, the rigidity on the opening side tends to be lower.

  However, the opening side portion of the side wall portion of the head member is sandwiched in the radial direction by the insertion portion of the bottom member arranged on the inner diameter side and the annular member arranged on the outer diameter side. For this reason, it can suppress that the rigidity of the part by the side of the opening part of a side wall part falls.

  (2) Preferably, in the configuration of (1), the side wall portion further has a head-side inner diameter engaging portion, and the insertion portion further engages with the head-side inner diameter engaging portion. It is better to have a structure having a side engaging portion (corresponding to claim 2). According to this configuration, the bottom member and the head member can be assembled relatively easily by engaging the head side inner diameter engaging portion and the bottom side engaging portion.

  (3) Preferably, in the configuration of (2), a pair of the head-side inner diameter engagement portion and the bottom-side engagement portion are arranged so as to face each other in the radial direction, and the pair of slits Are arranged so as to oppose each other in the radial direction, and the arrangement direction of the pair of head side inner diameter engaging portions and the arrangement direction of the pair of slits are preferably substantially orthogonal to each other ( Corresponding to claim 3).

  According to this configuration, the groove width direction of the pair of slits, the arrangement direction of the pair of head-side inner diameter engagement portions, and the arrangement direction of the pair of bottom-side engagement portions substantially coincide. For this reason, when the head member and the bottom member are assembled, that is, when the insertion portion of the bottom member is inserted into the inner diameter side of the side wall portion of the head member, the head-side inner diameter engagement portion is brought into sliding contact with the insertion portion, or When the side engaging portion is in sliding contact with the side wall portion, the opening can be enlarged in the groove width direction of the pair of slits relatively easily. For this reason, a bottom member and a head member can be assembled | attached more easily through the enlarged opening part.

  (4) Preferably, in the configuration of the above (2) or (3), the head-side inner diameter engaging portion is an engaged recess formed in an inner peripheral surface of the side wall portion, and the bottom side engagement The joint portion is an engaging claw projecting on the outer peripheral surface of the insertion portion, and the side wall portion further includes the engaging claw between the opening and the engaged recessed portion. It is better to have a claw guide recess for guiding to the mating recess (corresponding to claim 4). Here, the “recessed portion” of the engaged recessed portion is a concept including a hole shape penetrating the side wall portion in the inner and outer directions.

  According to this configuration, by aligning the claw guide recess and the engaging claw in the axial direction, the positioning of the bottom member and the head member before assembly can be performed relatively easily. Further, by guiding the track of the engaging claw with the claw guide recess, the engaging claw can be engaged with the engaged recess relatively easily.

  (5) Preferably, in any one of the constitutions (1) to (4), the side wall portion is further slid radially on the inner diameter side to the pair of slits and extends in the axial direction. The inner end of the inner cable further includes a shaft portion on which the pair of branch ends project, and the shaft portion is relative to the sliding hole. The pair of branch ends is preferably slidable in the axial direction relative to the pair of slits (corresponding to claim 5).

  According to this configuration, when the casing cap and the output side end of the inner cable move relatively, the output side end is less likely to rattle against the casing cap. For this reason, the operation reliability at the time of power transmission becomes high.

  (6) Preferably, in any one of the configurations (1) to (5), the side wall portion further includes a head-side outer diameter engaging portion, and the annular member further includes the head-side outer portion. It is better to have an annular member side engaging portion that engages with the radial engaging portion (corresponding to claim 6). According to this structure, a head member and an annular member can be assembled | attached comparatively easily by engaging a head side outer diameter engaging part and an annular member side engaging part.

  (7) Preferably, in any one of the configurations (1) to (6), the side wall portion may further include a flange portion that determines an axial position of the annular member on the outer peripheral surface ( (Corresponding to claim 7). According to this configuration, when the annular member is assembled, the annular member can be easily positioned. In addition, the annular member is less likely to be displaced in the axial direction after assembly.

  (8) Preferably, in any one of the configurations (1) to (7), the counterpart member is inserted into the headrest stay to transmit an operation force when moving at least a part of the headrest forward. It is better that the output rod is configured (corresponding to claim 8).

  That is, this structure uses the cable assembly of this invention for the power transmission of an active headrest apparatus. In the case of this configuration, at least a part of the headrest is driven forward by pressing the output rod at the top wall portion of the casing cap. For this reason, it is not necessary to drive a headrest frame or a headrest support bracket. Therefore, the structure inside the seat back can be simplified. In addition, it is easy to ensure the speed of operation.

  When the headrest is driven by transmitting tension as in Patent Document 3, the cable for transmitting tension (inner cable in Patent Document 3) needs to be integrated. For this reason, as described above, the headrest cannot be detached from the seat back.

  On the other hand, in the case of this configuration, the headrest is driven not by tension but by transmission of pressing force. For this reason, the casing cap and the output rod are separate from the outer casing, the casing cap, and the output rod that constitute the power transmission path. Specifically, the casing cap, that is, the control cable, is separately disposed on the seat back side, and the output rod is separately disposed on the headrest stay side. For this reason, the headrest can be attached to and detached from the seat back during normal times (for example, when the seat is in a full flat state) while maintaining the function of the active headrest device at the time of the vehicle rear-end collision. For this reason, the versatility with respect to a vehicle type is high.

  ADVANTAGE OF THE INVENTION According to this invention, the cable assembly which can arrange | position a detachable member in a part of power transmission path can be provided.

  Hereinafter, an embodiment in which the cable assembly of the present invention is embodied for power transmission of an active headrest device will be described.

<First embodiment>
[Cable assembly layout]
First, the arrangement of the cable assembly of this embodiment will be described. FIG. 1 shows a transparent perspective view of a sheet on which the cable assembly of this embodiment is arranged. FIG. 2 shows a transparent perspective view near the headrest stay mounting portion of the seat back of the seat. FIG. 3 shows an exploded perspective view of the vicinity of the headrest stay mounting portion of the seat back of the seat. In the drawings shown below, the azimuth (left and right) is defined with reference to the case of looking forward from the rear of the vehicle. As shown in FIGS. 1 to 3, the seat 9 includes a headrest 90 and a seat back 91.

  A headrest stay 900 projects from the lower edge of the headrest 90. The headrest stay 900 is made of metal and has a cylindrical shape. A pair of headrest stays 900 are arranged on the left and right. Among these, a stay side guide groove 901 is formed at the lower end portion of the right headrest stay 900. The stay side guide groove 901 has a substantially C-shape that extends upward from the lower end opening and curves in the circumferential direction. Two stay side guide grooves 901 are arranged opposite to each other in the radial direction. The right headrest stay 900 is inserted with an output rod 902 made of metal and having a round bar shape. The upper end of the output rod 902 is connected to a locking member (not shown). The locking member locks an urging spring (not shown). The biasing spring accumulates a biasing force for pushing the front portion of the headrest 90 forward.

  A rectangular block-shaped headrest detaching member 910 is attached to the upper edge of the seat back 91. A stay insertion hole (not shown) is formed in the upper surface of the headrest detaching member 910. A pair of headrest detaching members 910 are arranged on the left and right. A push-type button 910 a is disposed on the right headrest detaching member 910.

  A headrest support bracket 911 is embedded below the headrest detaching member 910. The headrest support bracket 911 is made of metal and has a cylindrical shape. A pair of headrest support brackets 911 are arranged on the left and right. The pair of headrest stays 900 are respectively inserted into the pair of headrest support brackets 911 through the stay insertion holes of the headrest attaching / detaching member 910.

  A plurality of recesses (not shown) are formed on the outer peripheral surface of the right headrest stay 900 at predetermined intervals in the axial direction. On the other hand, the right headrest detachable member 910 is provided with a convex portion (not shown) interlocked with the button 910a. By selectively engaging the convex portion with any of the plurality of concave portions, the insertion amount of the headrest stay 900 relative to the headrest support bracket 911, that is, the height of the headrest 90 can be adjusted.

  A bracket guide groove 912 is formed in the right headrest support bracket 911. The bracket-side guide groove 912 has a substantially J-shape that extends upward from the lower end opening and curves downward by a slight amount. The bracket side guide groove 912 is bent in the opposite direction to the bending direction of the stay side guide groove 901. Two bracket-side guide grooves 912 are arranged opposite to each other in the radial direction.

  The cable assembly 1 includes a casing cap 2 and a control cable 3. The cable assembly 1 is routed between the inside of the right headrest support bracket 911 and a metal pressure receiving plate 913 embedded in the lower portion of the seat back 91 (position corresponding to the occupant's waist). The routing path of the cable assembly 1 is substantially S-shaped. A method of attaching the casing cap 2, that is, the cable assembly 1 to the headrest support bracket 911 and the headrest stay 900 will be described in detail later.

[Configuration of cable assembly]
Next, the structure of the cable assembly 1 of this embodiment is demonstrated. FIG. 4 is a perspective view of the casing cap of the cable assembly of the present embodiment. FIG. 5 shows an exploded perspective view of the head member, the bottom member, and the annular member of the casing cap. FIG. 6 is an exploded perspective view of the head member and the bottom member of the casing cap. FIG. 7 shows a cross-sectional view in the VII-VII direction of FIG. The casing cap shown in FIGS. 4, 5, and 6 is obtained by rotating the casing cap shown in FIGS. 2 and 3 by about 45 ° in the circumferential direction.

  The casing cap 2 includes a head member 20, a bottom member 21, and an annular member 22. The head member 20 is made of polyamide, and includes a top wall part 200, an opening part 201, and a side wall part 202.

  The side wall 202 has a cylindrical shape. The top wall portion 200 has a disk shape. The top wall part 200 seals the upper end of the side wall part 202. On the other hand, the opening 201 is opened at the lower end of the side wall 202. For this reason, the head member 20 has a bottomed cylindrical shape (cup shape) that opens downward as a whole.

  The side wall portion 202 includes a pair of slits 202a, a pair of engaged holes 202b, one claw guide concave portion 202c, a sliding hole 202d, four engaging convex portions 202e, a flange portion 202f, and a step portion. 202k. Of these, the engaged hole 202b is included in the engaged recess of the present invention. The engaging convex portion 202e is included in the head side outer diameter engaging portion of the present invention.

  The flange portion 202f has an annular shape. The flange portion 202f protrudes from the outer peripheral surface of the side wall portion 202 in the diameter increasing direction. The flange portion 202f is disposed slightly below the axial direction of the side wall portion 202.

  Each of the pair of slits 202a has a long hole shape extending in the axial direction. The pair of slits 202a extends by dividing the flange portion 202f. Each of the pair of slits 202a penetrates the side wall 202 in the radial direction. The pair of slits 202a are disposed to face each other in the radial direction. The open ends of the lower edges of the pair of slits 202a are each continuous with the opening 201.

  Each of the pair of engaged holes 202b has a rectangular hole shape. The pair of engaged holes 202b are disposed below the flange portion 202f. Each of the pair of engaged holes 202b penetrates the side wall portion 202 in the radial direction. The pair of engaged holes 202b are disposed to face each other in the radial direction. The arrangement direction of the pair of engaged holes 202b and the arrangement direction of the pair of slits 202a are substantially orthogonal to each other.

  The pair of claw guide recesses 202 c are interposed between the pair of engaged holes 202 b and the opening 201. The pair of claw guide recesses 202c are arranged to face each other in the radial direction. The pair of claw guide recesses 202c have a tapered shape in which the interval gradually decreases upward.

  As shown in FIG. 7, the step portion 202 k is partitioned on the inner diameter side of the side wall portion 202. The stepped portion 202k is formed so as to reduce in diameter upward. The step portion 202k is disposed to face the lower end of the flange portion 202f in the radial direction.

  As shown in FIG. 7, the sliding hole 202 d is partitioned on the inner diameter side of the side wall portion 202. 202 d of sliding holes are arrange | positioned above the level | step-difference part 202k (small diameter side). The space in the sliding hole 202d has a cylindrical shape. The sliding hole 202d communicates with the pair of slits 202a in the radial direction.

  Each of the four engaging convex portions 202e has a triangular pyramid shape. The four engaging convex portions 202e are projected from the outer peripheral surface of the side wall portion 202. The four engagement convex portions 202e are disposed below the flange portion 202f. The four engaging convex portions 202e are arranged approximately 90 ° apart from each other in the circumferential direction of the side wall portion 202. Moreover, the arbitrary engaging convex part 202e is arrange | positioned in the middle of the slit 202a and the to-be-engaged hole 202b in the circumferential direction.

  The bottom member 21 is made of polyamide like the head member 20 and has a short-axis columnar shape. The bottom member 21 includes a pair of engaging claws 210, a cable insertion hole 211, and an insertion portion 212.

  The insertion part 212 forms the upper part of the bottom member 21. The insertion part 212 is accommodated on the inner diameter side of the side wall part 202 with the opening 201 sealed as if it were a stopper. The upper end of the insertion part 212 is in contact with the step part 202k on the inner diameter side of the side wall part 202. That is, the lower end opening of the sliding hole 202d is sealed by the upper end of the insertion portion 212.

  The pair of engaging claws 210 protrude from the outer peripheral surface of the insertion portion 212. The engaging claw 210 has a substantially triangular cross section that is pointed upward. The pair of engaging claws 210 are disposed to face each other in the radial direction. The pair of engaging claws 210 are engaged with the pair of engaged holes 202 b from the inner diameter side of the side wall portion 202. By the engagement, the bottom member 21 and the head member 20 are firmly integrated.

  The cable insertion hole 211 passes through the bottom member 21 in the vertical direction. As shown in FIG. 7, a stepped portion 211 a whose hole diameter decreases upward is formed in the middle of the cable insertion hole 211 in the axial direction.

  The annular member 22 is made of polyamide like the bottom member 21 and the head member 20, and has a short-axis cylindrical shape. The annular member 22 includes an engagement step 220. The annular member 22 is mounted on the outer peripheral surface of the side wall portion 202. The annular member 22 is disposed below the flange portion 202f. The annular member 22 seals the open ends of the pair of slits 202a. Further, the annular member 22 covers the pair of engaged holes 202b and the four engaging convex portions 202e from the outer diameter side. The engagement step 220 is annular and is disposed on the inner peripheral surface of the annular member 22. The engagement step 220 has a stepped shape that protrudes upward in the reduced diameter direction. Four engagement convex portions 202e of the side wall portion 202 are engaged with the lower surface of the engagement step 220. By this engagement, the annular member 22 and the head member 20 are firmly integrated. In addition, the lower part of the head member 20 than the flange portion 202f is sandwiched in the radial direction by the insertion portion 212 on the inner diameter side and the annular member 22 on the outer diameter side.

  The control cable 3 includes an outer casing 30 and an inner cable 31. The outer casing 30 has a three-layered tube shape. That is, the outer casing 30 includes a resin liner (not shown), a steel wire shield layer laminated on the outer diameter side of the liner, and a resin layer coat layer laminated on the outer diameter side of the shield layer. Become. As shown in FIG. 1, the input side end 30a of the outer casing 30 is fixed to a bracket 913a arranged on the left side of the pressure receiving plate 913. On the other hand, as shown in FIG. 7, the output side end 30 b of the outer casing 30 is fixed to the bottom member 21 in a state where it is inserted up to the stepped portion 211 a of the cable insertion hole 211. The output side end 30 b of the outer casing 30 is fixed simultaneously with the molding of the bottom member 21. That is, the output side end 30b is fixed to the bottom member 21 by insert molding in which resin is filled with the output side end 30b of the outer casing 30 placed in advance in the mold.

  The inner cable 31 includes a cable body 310 and a cable end member 311. Among these, the cable end member 311 is included in the “output side end” of the inner cable of the present invention.

  The cable body 310 has a thin line shape. The cable main body 310 includes a steel wire core wire (not shown) and a number of steel wire strands wound around the core wire. The cable body 310 is inserted into the outer casing 30 so as to be relatively slidable in the axial direction. As shown in FIG. 1, the input side end 310a of the cable body 310 is fixed to a trigger member 913b disposed on the left side of the pressure receiving plate 913. On the other hand, as shown in FIGS. 4 to 7, the output side end portion 310 b of the cable main body 310 passes through the cable insertion hole 211 and reaches the inside of the casing cap 2.

  The cable end member 311 is made of steel (manufactured by die casting) and has a substantially T shape (hammer head shape). The cable end member 311 includes a pair of branch ends 311a and a shaft portion 311b.

  The shaft portion 311b has a cylindrical shape. The shaft portion 311b is fixed to the output side end portion 310b of the cable body 310. The shaft portion 311b is accommodated in the sliding hole 202d of the side wall portion 202. Here, the outer diameter of the shaft portion 311b is set slightly smaller than the inner diameter of the sliding hole 202d. For this reason, the outer peripheral surface of the shaft portion 311b can be slidably and relatively smoothly in contact with the inner peripheral surface of the sliding hole 202d.

  Each of the pair of branch ends 311a has a small diameter columnar shape. The pair of branch ends 311a is provided so as to protrude in the diameter increasing direction from the side peripheral surface of the shaft portion 311b. The pair of branch ends 311a are disposed in the vicinity of the upper end of the shaft portion 311b. The pair of branch ends 311a are disposed to face each other in the radial direction. The pair of branch ends 311a respectively penetrates the pair of slits 202a in the radial direction. That is, the tips of the pair of branch ends 311 a protrude toward the outer diameter side of the side wall portion 202. Here, the outer diameter of the branch end 311a is set slightly smaller than the groove width of the slit 202a. For this reason, the outer peripheral surface of the branch end 311a can be slid relatively smoothly with the groove side surface of the slit 202a.

[Assembly method of cable assembly]
Next, a method for assembling the cable assembly 1 according to this embodiment will be described. The method of assembling the cable assembly 1 according to the present embodiment includes a first step of assembling the head member and the bottom member, and a second step of further assembling an annular member to the head member to which the bottom member is assembled. .

  First, the first step will be described. FIG. 8 shows an exploded perspective view of the head member and the bottom member in the first step in the cable assembly assembling method of the present embodiment. FIG. 9 is an exploded axial sectional view of the head member and the bottom member in the same process. FIG. 10 shows an enlarged view in the circle X of FIG. In addition, the cross-sectional direction of FIG. 9 is the same as that of FIG.

  Before the first step, as shown in FIG. 7, the control cable 3 is attached to the bottom member 21 in advance. Specifically, the output side end 30 b of the outer casing 30 is fixed to the bottom member 21 in a state where it abuts on the stepped portion 211 a of the cable insertion hole 211. Further, the cable end member 311 protrudes above the bottom member 21 from the cable insertion hole 211. The head member 20 and the bottom member 21 are arranged in series on substantially the same axis. The head member 20 and the bottom member 21 are positioned so that the pair of engaged holes 202b and the pair of engaging claws 210 face each other in the vertical direction.

  After starting the process, the bottom member 21 is moved closer to the head member 20 in this state. When both members are brought close to each other, as shown in FIG. 8, the pair of branch ends 311 a of the cable end member 311 are inserted into the pair of slit 202 a open ends of the head member 20. Furthermore, when both members are brought close to each other, as shown in FIG. 9, the shaft portion 311 b of the cable end member 311 is inserted into the sliding hole 202 d of the head member 20.

  Thereafter, the insertion portion 212 of the bottom member 21 is inserted into the inner diameter side of the side wall portion 202 of the head member 20 through the opening 201. At this time, as shown in FIG. 9, the pair of engaging claws 210 first approach the pair of claw guide recesses 202 c. Here, the pair of claw guide recesses 202c have a taper shape in which the interval gradually narrows upward. On the other hand, the pair of engaging claws 210 has a triangular shape that is pointed upward. For this reason, as shown in FIG. 10, the load F0 applied to the claw guide recess 202c from the engagement claw 210 is a component force F1 substantially perpendicular to the surface extending direction of the claw guide recess 202c and a direction substantially perpendicular to the load F0. It is decomposed | disassembled into the component force F2. Among these, the space | interval between a pair of nail | claw guide recessed parts 202c is expanded by component force F1 (> load F0). In other words, the pair of engaging claws 210 uses the wedge force-increasing mechanism to expand the opening 201 with the pair of slits 202a (see FIG. 8 described above) of the head member 20 as a boundary.

  Thus, the insertion part 212 is inserted into the inner diameter side of the side wall part 202 while expanding the opening part 201. The pair of engaging claws 210 are engaged with the pair of engaged holes 202b from the inside by the elastic restoring force of the opening 201 once pushed through after passing through the pair of claw guide recesses 202c. As described above, the assembly of the head member 20 and the bottom member 21, that is, the first step is completed by engaging the pair of engaging claws 210 and the pair of engaged holes 202b.

  Subsequently, the second step will be described. FIG. 11 is an exploded axial sectional view of the head member, the bottom member, and the annular member in the second step in the cable assembly assembling method of the present embodiment. FIG. 12 shows an axial cross-sectional view of the casing cap after completion of the same process. 11 and 12 are the same as those in FIG.

  Before the second step, as shown in FIG. 11, the head member 20, the bottom member 21, and the annular member 22 are arranged in series on substantially the same axis. After the start of the process, the annular member 22 is brought relatively close to the head member 20 and the bottom member 21 in this state. Then, the side wall portion 202 of the head member 20 is relatively inserted into the inner diameter side of the annular member 22. The insertion is performed until the upper end of the annular member 22 contacts the lower surface of the flange portion 202f. Here, on the outer peripheral surface of the side wall portion 202, as shown in FIG. 5, four engaging convex portions 202e are formed. On the other hand, an engagement step 220 is formed on the inner peripheral surface of the annular member 22. For this reason, when the side wall 202 is relatively inserted into the inner diameter side of the annular member 22, the four engaging protrusions 202 e and the engaging step 220 are engaged.

  As described above, the assembly of the head member 20 and the annular member 22, that is, the second step is completed by engaging the four engagement convex portions 202 e with the engagement step 220. In this way, the cable assembly 1 of the present embodiment is assembled.

[Attaching method of cable assembly]
Next, a method for attaching the cable assembly 1 of the present embodiment to the headrest support bracket 911 and the headrest stay 900 will be described. The method of attaching the cable assembly 1 of the present embodiment includes a bracket attaching step for attaching the cable assembly 1 to the headrest support bracket 911, and a stay attaching step for attaching the cable assembly 1 attached to the headrest support bracket 911 to the headrest stay 900. Have.

  First, the bracket mounting process will be described. FIG. 13 is a perspective view showing the first half of the bracket mounting process. In FIG. 14, the locus | trajectory with respect to the bracket side guide groove of the branch end in a bracket attachment process is shown.

  In the bracket attaching step, as shown in FIG. 13, the casing cap 2 of the cable assembly 1 is inserted into the lower end of the headrest support bracket 911. Here, the headrest support bracket 911 has a pair of bracket-side guide grooves 912 formed therein. In addition, a pair of branch ends 311 a of the inner cable 31 protrude from the casing cap 2 in the lateral direction. When the casing cap 2 is inserted, the pair of branch ends 311a are inserted into the pair of bracket-side guide grooves 912, respectively. As the insertion depth of the casing cap 2 with respect to the headrest support bracket 911 becomes deeper, the branch end 311a relatively rises in the bracket side guide groove 912 as shown in FIG. Finally, the branch end 311a reaches the curved end 912a of the bracket-side guide groove 912.

  Next, the stay attaching process will be described. FIG. 15 is a perspective view showing a state after the bracket attaching process is completed and before the stay attaching process is started. FIG. 16 shows the arrangement of the branch end with respect to the bracket side guide groove and the stay side guide groove at the start of the stay attaching process. FIG. 17 shows the arrangement of the branch end with respect to the bracket side guide groove and the stay side guide groove in the course of the stay mounting process. FIG. 18 shows the arrangement of the branch end with respect to the bracket-side guide groove and the stay-side guide groove after the stay mounting step.

  In the stay attaching step, as shown in FIG. 15, the headrest stay 900 is inserted into the headrest support bracket 911 through a stay insertion hole formed in the upper surface of the headrest attaching / detaching member 910. At this time, the opening ends 901a of the pair of stay side guide grooves 901 and the curved ends 912a of the pair of bracket side guide grooves 912 are aligned so as to face each other in the vertical direction. When the headrest stay 900 is inserted in this state, as shown in FIG. 16, the branch end 311a housed in the curved end 912a is relatively inserted into the opening end 901a of the stay side guide groove 901. . As the insertion depth of the headrest stay 900 with respect to the headrest support bracket 911 becomes deeper, the branch end 311a moves in the circumferential direction while being regulated by the bracket side guide groove 912 and the stay side guide groove 901 as shown in FIG. . In other words, the branch end 311 a moves in the radial overlap portion between the bracket side guide groove 912 and the stay side guide groove 901. Finally, as shown in FIG. 18, the branch end 311 a reaches the curved end 901 b of the stay side guide groove 901.

  Thus, the attachment of the cable assembly 1 to the headrest support bracket 911 and the headrest stay 900 is completed, and the state shown in FIG. After the attachment, the lower end of the output rod 902 in the headrest stay 900 is disposed immediately above the top wall portion 200 of the casing cap 2.

[How to remove the headrest]
Next, a method for detaching the headrest 90 from the seat back 91 will be described. When removing the headrest 90 shown in FIG. 1 from the seat back 91, the headrest stay 900 is pulled upward from the headrest support bracket 911 while pressing the button 910a of the headrest attaching / detaching member 910 shown in FIG. That is, the headrest stay 900 is pulled upward from the headrest support bracket 911 in a state where the engagement between the concave portion on the outer peripheral surface of the headrest stay 900 and the convex portion of the headrest detachable member 910 is released.

  At this time, the branch end 311a moves in the bracket-side guide groove 912 from the straight line portion to the curved end 912a while drawing the locus of FIG. 18 → FIG. 17 → FIG. In addition, the branch end 311a moves in the stay side guide groove 901 from the curved end 901b to the opening end 901a. That is, the branch end 311a is transferred from the curved end 901b of the stay side guide groove 901 to the curved end 912a of the bracket side guide groove 912.

  On the contrary, when the headrest 90 shown in FIG. 1 is attached to the seat back 91, the headrest stay 900 is inserted into the headrest support bracket 911 while pressing the button 910a of the headrest detachable member 910 shown in FIG. The movement at this time is the same as that in the stay attaching step in [Cable assembly attaching method].

[Headrest height adjustment method]
Next, a method for adjusting the height of the headrest 90 relative to the seat back 91 will be described. When adjusting the height of the headrest 90 with respect to the seat back 91 shown in FIG. 1, the headrest stay 900 is moved relative to the headrest support bracket 911 while pressing the button 910a of the headrest detaching member 910 shown in FIG. Move up or down. That is, the headrest stay 900 is moved upward or downward with respect to the headrest support bracket 911 in a state where the engagement between the concave portion on the outer peripheral surface of the headrest stay 900 and the convex portion of the headrest detachable member 910 is released.

  Here, as shown in FIGS. 2 and 18, the bracket end guide groove 912 is in a state where the branch end 311a is engaged with the curved end 901b of the stay side guide groove 901 after the completion of the cable assembly attachment. It is arranged in the straight part. For this reason, the branch end 311a can move the straight part of the bracket side guide groove 912 in the vertical direction together with the curved end 901b.

  Within the vertically movable range of the branch end 311a, the relative height of the curved end 901b, that is, the stay side guide groove 901, with respect to the bracket side guide groove 912 can be freely set. In other words, the occupant can freely set the relative height of the headrest 90 with respect to the seat back 91 within the up-and-down direction movable range of the branch end 311a.

[Movement of cable assembly during vehicle rear-end collision]
Next, the movement of the cable assembly 1 of this embodiment at the time of a vehicle rear-end collision will be described. FIG. 19A shows a schematic diagram of the cable assembly of the present embodiment before the vehicle rear-end collision. FIG. 19B is a schematic diagram of the cable assembly at the time of vehicle rear-end collision. FIG. 20 is an axial sectional view of the vicinity of the casing cap of the cable assembly of the present embodiment before the vehicle rear-end collision. FIG. 21 is a sectional view in the axial direction near the casing cap of the cable assembly at the time of vehicle collision.

  Before the vehicle rear-end collision, as shown in FIG. 19A, the input side end 30a of the outer casing 30 is fixed to the bracket 913a. The input side end 310a of the cable body 310 of the inner cable 31 is connected to the trigger member 913b. Further, as shown in FIG. 20, the lower end of the output rod 902 is disposed immediately above the top wall portion 200 of the head member 20. Further, the output side end 30 b of the outer casing 30 is connected to the bottom member 21 of the casing cap 2. Further, the pair of branch ends 311 a of the cable end member 311 of the inner cable 31 are respectively inserted into the pair of slits 202 a, the pair of stay side guide grooves 901, and the pair of bracket side guide grooves 912 of the head member 20. (See Figure 2 above).

  Here, the pair of branch ends 311a is engaged with the curved ends 901b of the pair of stay side guide grooves 901 (see FIG. 18). Further, the headrest stay 900 is fixed to the headrest support bracket 911 by a button 910 a of the headrest detaching member 910. Therefore, the pair of branch ends 311a is immovable with respect to the pair of stay side guide grooves 901 (that is, the headrest stay 900) and the pair of bracket side guide grooves 912 (that is, the headrest support bracket 911). On the other hand, the pair of branch ends 311 a can move in the vertical direction relatively with respect to the pair of slits 202 a of the head member 20.

  At the time of the vehicle rear-end collision, the occupant is pressed against the seat back 91. For this reason, a load is input from the occupant waist to the pressure receiving plate 913 via the front surface of the seat back 91. As shown in FIG. 19B, the trigger member 913b is pulled downward by the load. Here, as described above, the pair of branch ends 311a of the cable end member 311 of the inner cable 31 is immovable with respect to the pair of stay side guide grooves 901 and the pair of bracket side guide grooves 912, respectively. For this reason, when the trigger member 913b is pulled, the inner cable 31 tends to deform so as to approach the straight line L so as to connect the trigger member 913b and the cable end member 311 with the shortest distance.

  At this time, the outer casing 30 also tends to deform following the inner cable 31. For this reason, an axial compression force is applied to the outer casing 30. Here, as described above, the input side end portion 30a of the outer casing 30 is fixed to the bracket 913a and does not move. Therefore, the output side end 30b of the outer casing 30 moves upward by the reaction force of the axial compression force. In other words, the casing cap 2 is raised. As shown in FIG. 21, the rising casing cap 2 pushes up the output rod 902. Therefore, the engagement of the locking member with the urging spring is released, and the front portion of the headrest 90 protrudes forward (specifically, the front upper side) quickly due to the urging force accumulated in the urging spring. The protruding headrest 90 approaches the occupant's rear head and protects the occupant from whiplash and the like.

[Function and effect]
Next, the effect of the cable assembly 1 of this embodiment is demonstrated. According to the cable assembly 1 of this embodiment, a part of the headrest 90 can be driven forward by pressing the output rod 902 with the top wall portion 200 of the casing cap 2. For this reason, it is not necessary to drive a headrest frame or a headrest support bracket. Therefore, the structure inside the seat back 91 can be simplified. In addition, it is easy to ensure the speed of operation.

  Further, when driving the headrest 90 by transmitting tension as in the above-mentioned Patent Document 3, the cable for transmitting the tension (in the case of Patent Document 3, the inner cable) needs to be integrated. For this reason, as described above, the headrest 90 cannot be detached from the seat back 91.

  On the other hand, in the case of the cable assembly 1 of the present embodiment, the headrest 90 is driven not by tension but by transmission of pressing force. For this reason, the casing cap 2 and the output rod 902 are separate from the outer casing 30, the casing cap 2, and the output rod 902 that constitute the power transmission path. Specifically, the casing cap 2, that is, the control cable 3 is disposed separately on the seat back 91 side, and the output rod 902 is disposed separately on the headrest stay 900 side. For this reason, the headrest 90 can be attached to and detached from the seat back 91 in a normal state (for example, when the seat is in a full flat state) while ensuring the function of the active headrest device at the time of the vehicle rear-end collision. For this reason, the versatility with respect to a vehicle type is high.

  Moreover, the casing cap 2 is not an integral object, but is composed of three parts, that is, a head member 20, a bottom member 21, and an annular member 22. If the casing cap 2 is an integral part and the output side end 30b of the outer casing 30 is to be fixed to the casing cap 2 at the same time as molding (see FIG. 20), it is necessary to dispose a molding pin. The molding pin is inserted into the cavity so as to penetrate the top wall portion 200 forming portion in the vertical direction, and is disposed so as to close the end surface of the output side end portion 30b of the outer casing 30. By inserting the forming pin, a portion of the cable insertion hole 211 above the step portion 211a can be formed. In addition, the inflow of the resin into the outer casing 30 can be prevented. However, when the molding pin is inserted, a hole remains as a molding pin insertion mark in the top wall portion 200 after molding. It is difficult to press the output rod 902 in the state where the hole remains in the top wall portion 200. For this reason, a part for closing the hole is required separately. In addition, an operation process for attaching the component is also required. Moreover, as long as it is a site | part which presses the output rod 902 directly, it is preferable that the structure of the top wall part 200 is simple. That is, it is preferable that the top wall portion 200 is a single piece.

  In this respect, the casing cap 2 of the cable assembly 1 according to the present embodiment is composed of three parts: a head member 20, a bottom member 21, and an annular member 22. The output member end 30b of the outer casing 30 is fixed to the bottom member 21. On the other hand, the top member 20 that presses the output rod 902 is disposed on the head member 20. For this reason, the output side end portion 30 b of the outer casing 30 can be fixed simultaneously with the molding of the bottom member 21. In addition, when the head member 20 is molded, a molding pin is not necessary, so there is no possibility that a hole is formed in the top wall portion 200.

  Further, according to the cable assembly 1 of the present embodiment, the pressing force is transmitted not by the inner cable 31 but by the outer casing 30. The outer casing 30 has a larger diameter than the inner cable 31. For this reason, when the output rod 902 is pushed up, even if an axial compression force is applied from the casing cap 2 to the outer casing 30, the outer casing 30 is unlikely to undergo compression buckling. Therefore, it is possible to reliably transmit the pressing force.

  Moreover, according to the cable assembly 1 of this embodiment, the bottom member 21 and the head member 20 are assembled | attached when the engaging claw 210 and the to-be-engaged hole 202b engage. For this reason, the bottom member 21 and the head member 20 can be assembled with one touch.

  Moreover, according to the cable assembly 1 of this embodiment, the head member 20 and the annular member 22 are assembled | attached by the four engagement convex parts 202e and the engagement level | step difference 220 engaging. For this reason, the head member 20 and the annular member 22 can be assembled with one touch.

  Further, according to the cable assembly 1 of the present embodiment, the claw guide recess 202 c is formed near the opening 201 of the head member 20. For this reason, when the bottom member 21 is inserted, the engagement claw 210 can be easily aligned. Moreover, the head member 20 can be expanded in the diameter increasing direction with a small load F0 by the wedge increasing mechanism shown in FIG. Therefore, assembly work is easy. In particular, when a large number of casing caps 2 are assembled continuously, the work load on the operator can be reduced.

  Further, according to the cable assembly 1 of the present embodiment, as shown in FIG. 6, the cable end member 311 is fixed to the output side end 310b in advance before the head member 20 and the bottom member 21 are assembled. I can keep it. For this reason, after the head member 20 and the bottom member 21 are assembled, the assembling work is easier as compared with the case where the cable end member 311 is fixed to the output side end portion 310b. In addition, the head member 20 and the bottom member 21 can be assembled after the work related to the control cable 3 such as the adjustment of the floating length of the inner cable 31 is completed.

  In addition, if at least one of the pair of slits 202a has an endless long hole shape, an excessive load is applied when the cable end member 311 is inserted into the slit, causing some damage to the casing cap 2 or the cable end member 311. May remain.

  In this regard, the pair of slits 202a of the cable assembly 1 of the present embodiment are both continuous with the opening 201 and have an end-like long hole shape. For this reason, as described above, the cable end member 311 can be inserted into the pair of slits 202a relatively easily only by bringing the bottom member 21 relatively close to the head member 20. Therefore, there is little possibility that damage will remain in the casing cap 2 or the cable end member 311.

  Further, according to the cable assembly 1 of the present embodiment, the arrangement direction of the pair of engaged holes 202b (or the arrangement direction of the pair of engaging claws 210) is substantially orthogonal to the arrangement direction of the pair of slits 202a. ing. For this reason, the groove width direction of the pair of slits 202a and the direction of the component force F1 applied to the pair of claw guide recesses 202c from the pair of engaging claws 210 when the insertion portion 212 is inserted (see FIG. 10 above) are substantially the same. I'm doing it. Therefore, when the insertion part 212 is inserted, the groove width of the pair of slits 202a is easily widened. That is, the opening 201 is easy to expand. Also in this respect, the assembling work is easy.

  Further, according to the cable assembly 1 of the present embodiment, the outer diameter of the shaft portion 311b is set slightly smaller than the inner diameter of the sliding hole 202d. For this reason, when the cable end member 311 descends relatively in the casing cap 2 at the time of a vehicle rear-end collision, compared to the case where the outer diameter of the shaft portion 311b is extremely smaller than the inner diameter of the sliding hole 202d. (See FIG. 21 above), the cable end member 311 is less likely to rattle. In addition, the smooth movement of the cable end member 311 is less likely to be restricted by the sliding resistance than when the outer diameter of the shaft portion 311b is substantially the same as the inner diameter of the sliding hole 202d. Therefore, the cable assembly 1 of this embodiment has high operational reliability.

  Further, according to the cable assembly 1 of the present embodiment, the outer diameter of the branch end 311a is set slightly smaller than the groove width of the slit 202a. For this reason, when the outer diameter of the branch end 311a is extremely smaller than the groove width of the slit 202a, the cable end member 311 is relatively lowered in the casing cap 2 at the time of the vehicle rear-end collision ( 21), the cable end member 311 is less likely to rattle. In addition, as compared with the case where the outer diameter of the branch end 311a and the groove width of the slit 202a substantially coincide with each other, the smooth movement of the cable end member 311 is less likely to be restricted by the sliding resistance. Therefore, the cable assembly 1 of this embodiment has high operation reliability also in this respect.

  Further, according to the cable assembly 1 of the present embodiment, the opening 201 side portion of the side wall portion 202 of the head member 20 is disposed on the outer diameter side with the insertion portion 212 of the bottom member 21 disposed on the inner diameter side. The annular member 22 is sandwiched in the radial direction. For this reason, the open ends of the pair of slits 202a can be reliably sealed. Therefore, it is possible to suppress the branch end 311a of the inner cable 31 from dropping from the slit 202a through the open end.

  In general, in the case of a bottomed cylindrical member, the opening side has lower rigidity than the bottom side. In this regard, also in the case of the head member 20 of the cable assembly 1 of the present embodiment, the rigidity on the opening 201 side is lower than that on the top wall part 200 side. In addition, in the case of the head member 20, since the pair of slits 202a are connected to the opening 201, the rigidity on the opening 201 side tends to be lower.

  However, the opening 201 side portion of the side wall portion 202 of the head member 20 is radially formed by the insertion portion 212 of the bottom member 21 disposed on the inner diameter side and the annular member 22 disposed on the outer diameter side. It is pinched. For this reason, it can suppress that the rigidity of the part by the side of the opening part 201 of the side wall part 202 falls.

  Further, according to the cable assembly 1 of the present embodiment, the flange portion 202 f is formed on the outer peripheral surface of the side wall portion 202. For this reason, when the annular member 22 is assembled, the positioning of the annular member is easy. Further, the annular member 22 is not easily displaced in the axial direction after assembly.

  Moreover, according to the cable assembly 1 of this embodiment, the insertion depth of the insertion part 212 with respect to the side wall part 202 is regulated by the step part 202k. For this reason, there is no possibility that the insertion portion 212 enters the sliding hole 202d. In other words, the axial length of the sliding hole 202d, that is, the stroke of the cable end member 311 can be adjusted by the position of the stepped portion 202k.

  Further, according to the cable assembly 1 of the present embodiment, the inner diameter of the headrest support bracket 911 and the outer diameters of the flange portion 202f and the annular member 22 are substantially the same. For this reason, it is possible to prevent the casing cap 2 from rattling in the headrest support bracket 911.

  Further, according to the cable assembly 1 of the present embodiment, the inner diameter of the headrest stay 900 and the outer diameter of the side wall portion 202 (excluding the flange portion 202f) are substantially the same. For this reason, it is possible to prevent the casing cap 2 from rattling in the headrest stay 900.

<Second embodiment>
The difference between the cable assembly of this embodiment and the cable assembly of the first embodiment is that no flange portion is disposed on the outer peripheral surface of the side wall portion. Moreover, the external thread part is arrange | positioned at the outer peripheral surface of a side wall part. Further, the engagement step is not disposed on the inner peripheral surface of the annular member. Moreover, the internal thread part is arrange | positioned at the internal peripheral surface of an annular member. Therefore, only the differences will be described here.

  FIG. 22 is an exploded perspective view of the head member, the bottom member, and the annular member of the casing cap of the cable assembly of the present embodiment. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol.

  As shown in FIG. 22, the flange portion is not disposed on the outer peripheral surface of the side wall portion 202 of the head member 20. A male screw portion 202g is formed on the outer peripheral surface of the lower portion of the side wall portion 202. On the other hand, an internal thread portion 221 is formed on the inner peripheral surface of the annular member 22 instead of the engagement step. The annular member 22 can be assembled to the head member 20 by inserting the head member 20 relatively to the inner diameter side of the annular member 22 and screwing the male screw portion 202g into the female screw portion 221.

  The cable assembly 1 of the present embodiment has the same effects as the cable assembly of the first embodiment with respect to the parts having the same configuration. Further, according to the cable assembly 1 of the present embodiment, the annular member 22 can be positioned by adjusting the axial position of the male screw portion 202g in the side wall portion 202. For this reason, a flange part is unnecessary.

<Third embodiment>
The difference between the cable assembly of this embodiment and the cable assembly of the first embodiment is that two flange portions are arranged on the outer peripheral surface of the side wall portion. Further, the annular member has a substantially C shape. Therefore, only the differences will be described here.

  FIG. 23 is an exploded perspective view of the head member, the bottom member, and the annular member of the casing cap of the cable assembly of the present embodiment. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol.

  As shown in FIG. 23, on the outer peripheral surface of the side wall portion 202 of the head member 20, an opening end flange portion 202h is disposed in addition to the flange portion 202f. The opening end flange 202 h is formed on the periphery of the opening 201 of the side wall 202. The annular member 23 has a substantially C shape. That is, the annular member 23 has a notch 230. The annular member 23 is mounted in a section of the side wall portion 202 between the flange portion 202f and the open end flange portion 202h.

  When assembling the annular member 23, the annular member 23 is externally fitted to the section on the outer peripheral surface of the side wall 202 from the outside in the radial direction. At this time, after making the notch 230 and the slit 202 a face each other, the annular member 23 is pressed against the outer peripheral surface of the side wall 202. Here, the opening width of the notch 230 is set larger than the groove width of the slit 202a. For this reason, the C-shaped both ends of the annular member 23 can slide along the outer peripheral surface of the side wall 202 without being immersed in the slit 202a. After the external fitting, the annular member 23 is rotated by approximately 90 ° so that the position of the notch 230 does not overlap the position of the slit 202a.

  The cable assembly 1 of the present embodiment has the same effects as the cable assembly of the first embodiment with respect to the parts having the same configuration. Further, according to the cable assembly 1 of the present embodiment, the annular member 23 has the notch 230. For this reason, the annular member 23 can be assembled to the side wall portion 202 from the radially outer side. Therefore, it is not necessary to insert the control cable 3 into the inner diameter side of the annular member 23 before assembling the head member 20 and the bottom member 21. Therefore, the assembly of the casing cap 2 is easy. Further, the casing cap 2 can be easily disassembled. Further, after the mounting, the annular member 23 is restricted from the outer diameter side by the inner peripheral surface of the headrest support bracket 911 (see FIG. 20). For this reason, there is little possibility that the annular member 23 will drop off after attachment.

<Others>
The embodiment of the cable assembly of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  For example, in the above embodiment, the headrest 90 is driven by the urging force accumulated in the urging spring. However, the headrest 90 may be driven by the pressing force itself transmitted from the outer casing 30 → the casing cap 2 → the output rod 902. Further, instead of the pressure receiving plate 913, for example, a sensor may be arranged at the rear of the vehicle, and an operation force may be applied to the inner cable 31 using a signal from the sensor as a trigger.

  Further, the number of the engagement holes 202b, the claw guide recesses 202c, and the engagement claw 210 is not particularly limited. For example, three at every 120 ° and four at every 90 ° may be arranged. Further, the engaged hole 202b may be disposed on the bottom member 21 and the engaging claw 210 may be disposed on the head member 20, respectively.

  In the above embodiment, the output side end 30b of the outer casing 30 is fixed simultaneously with the molding of the bottom member 21, but the bottom member 21 is first molded and then output to the cable insertion hole 211 of the bottom member 21. The output side end 30b may be fixed by inserting the side end 30b and finally fitting a metal socket on the bottom member 21. When the bottom member 21 is made of metal, the output side end 30b may be fixed by crimping the bottom member 21 itself.

  Also, the method for joining the cable end member 311 to the cable body 310 of the inner cable 31 is not particularly limited. In addition to casting, joining may be performed by welding, caulking, or the like.

  Further, the material of each member constituting the cable assembly 1 is not particularly limited. For example, the casing cap 2 may be made of other resin such as polyoxymethylene. Further, it may be made of metal. Moreover, the material of the wire which comprises the control cable 3, the number of twists, etc. are not specifically limited.

  Moreover, in the said embodiment, although the cable assembly of this invention was used for active headrest apparatuses, the cable assembly of this invention can be used for various apparatuses which perform power transmission by pressing.

It is a permeation | transmission perspective view of the sheet | seat in which the cable assembly of 1st embodiment is arrange | positioned. It is a permeation | transmission perspective view of the headrest stay vicinity vicinity of the seat back of the seat. It is a disassembled perspective view of the vicinity of the headrest stay mounting portion of the seat back of the seat. It is a perspective view of the casing cap of the cable assembly. It is a disassembled perspective view of the head member, bottom member, and annular member of the casing cap. It is a disassembled perspective view of the head member and bottom member of the casing cap. It is a VII-VII direction sectional view of Drawing 6. It is a disassembled perspective view of the head member and bottom member of the 1st process in the assembly | attaching method of the cable assembly. It is a decomposition axial direction sectional view of the head member and bottom member of the same process. FIG. 10 is an enlarged view in a circle X of FIG. 9. It is a decomposition axial direction sectional view of the head member of the 2nd process in the assembly method of the cable assembly, a bottom member, and an annular member. It is an axial sectional view of the casing cap after completion of the same process. It is a perspective view which shows the state of the bracket attachment process first half in the attachment method of the cable assembly. It is a schematic diagram which shows the locus | trajectory with respect to the bracket side guide groove of the branch end in the same process. It is a perspective view which shows the state after completion | finish of a bracket attachment process and before a stay attachment process start. It is a schematic diagram which shows arrangement | positioning with respect to the bracket side guide groove and stay side guide groove of the branch end at the time of a stay attachment process start. It is a schematic diagram which shows arrangement | positioning with respect to the bracket side guide groove and stay side guide groove of the branch end in the middle of the process. It is a schematic diagram which shows arrangement | positioning with respect to the bracket side guide groove and stay side guide groove of the branch end after the process completion | finish. (A) is a schematic diagram of the cable assembly before the vehicle rear-end collision. (B) is the schematic diagram of the cable assembly at the time of a vehicle rear-end collision. It is an axial sectional view of the casing cap of the cable assembly before the vehicle rear-end collision. It is an axial sectional view of a casing cap of the cable assembly at the time of a vehicle rear-end collision. It is a disassembled perspective view of the head member of the casing cap of the cable assembly of 2nd embodiment, a bottom member, and an annular member. It is a disassembled perspective view of the head member of the casing cap of the cable assembly of 3rd embodiment, a bottom member, and an annular member.

Explanation of symbols

1: Cable assembly.
2: casing cap, 20: head member, 21: bottom member, 22: annular member, 23: annular member, 200: top wall, 201: opening, 202: side wall, 202a: slit, 202b: engaged Hole (engaged recessed portion), 202c: claw guide recessed portion, 202d: sliding hole, 202e: engaging convex portion (head side outer diameter engaging portion), 202f: flange portion, 202g: male screw portion, 202h: open end Flange part, 202k: step part, 210: engagement claw, 211: cable insertion hole, 211a: step part, 212: insertion part, 220: engagement step, 221: female thread part, 230: notch part.
3: control cable, 30: outer casing, 30a: input side end, 30b: output side end, 31: inner cable, 310: cable body, 310a: input side end, 310b: output side end, 311: Cable end member (output side end portion), 311a: branch end, 311b: shaft portion.
9: Seat, 90: Headrest, 91: Seatback, 900: Headrest stay, 901: Stay side guide groove, 901a: Open end, 901b: Curved end, 902: Output rod, 910: Headrest detachable member, 910a: Button, 911: Headrest support bracket, 912: Bracket side guide groove, 912a: curved end, 913: pressure receiving plate, 913a: bracket, 913b: trigger member.
F0: Load, F1: Component force, F2: Component force, L: Straight line.

Claims (8)

A cylindrical side wall portion having a pair of slits extending in the axial direction, a top wall portion that seals one axial end of the side wall portion and is disposed close to the mating member, and an axis of the side wall portion A head member having an opening that is opened at the other end in the direction and that is connected to the open ends of the pair of slits;
A bottom member having an insertion portion inserted into the inner diameter side of the side wall portion through the opening, and a cable insertion hole penetrating in the axial direction;
An annular member disposed on the outer diameter side of the side wall portion including a section facing the insertion portion in the radial direction;
A casing cap having
A cylindrical outer casing having an output side end fixed to the bottom member;
An output having a pair of branch ends that are inserted into the outer casing so as to be reciprocally movable in the axial direction, penetrate the cable insertion holes, and are respectively inserted into the pair of slits so as to be reciprocally movable in the axial direction. An inner cable having side ends;
A control cable having
With
By applying tension to the inner cable, an axial compressive force is generated in the outer casing, and the output side end of the outer casing is driven by a reaction force of the axial compressive force, and the top wall of the casing cap Cable assembly for moving the mating member at a portion. The side wall portion further has a head side inner diameter engaging portion,
The cable assembly according to claim 1, wherein the insertion portion further includes a bottom-side engagement portion that engages with the head-side inner diameter engagement portion. A pair of the head side inner diameter engaging part and the bottom side engaging part are arranged so as to face each other in the radial direction,
The pair of slits are arranged to face each other in the radial direction,
The cable assembly according to claim 2, wherein the arrangement direction of the pair of head-side inner diameter engaging portions and the arrangement direction of the pair of slits are substantially orthogonal to each other. The head-side inner diameter engaging portion is an engaged recess that is recessed in the inner peripheral surface of the side wall portion,
The bottom side engaging portion is an engaging claw protruding from the outer peripheral surface of the insertion portion,
The cable according to claim 2 or 3, wherein the side wall portion further includes a claw guide recess for guiding the engaging claw to the engaged recess between the opening and the engaged recess. assembly. The side wall portion further has, on the inner diameter side, a sliding hole that communicates with the pair of slits in the radial direction and extends in the axial direction.
The output side end portion of the inner cable further includes a shaft portion on which a pair of branch ends project.
The shaft portion is slidable in the axial direction relative to the sliding hole,
The cable assembly according to any one of claims 1 to 4, wherein the pair of branch ends are slidable in the axial direction relative to the pair of slits. The side wall portion further has a head-side outer diameter engaging portion,
The cable assembly according to any one of claims 1 to 5, wherein the annular member further includes an annular member side engaging portion that engages with the head-side outer diameter engaging portion.   The cable assembly according to claim 1, wherein the side wall portion further includes a flange portion that determines an axial position of the annular member on an outer peripheral surface.   The cable assembly according to any one of claims 1 to 7, wherein the counterpart member is an output rod that is inserted into the headrest stay to transmit an operation force when moving at least a part of the headrest forward. .

Images