JP4831332B2 - Strut prop - Google Patents

Description

  The present invention relates to a telescopic strut that is vertically installed between a floor surface and a ceiling surface.

  As a prior art regarding such a strut, for example, there is one disclosed in Patent Document 1. The thing shown by this patent document 1 is equipped with the large diameter pipe standingly arranged by the floor surface side, and the small diameter pipe inserted in this large diameter pipe so that expansion-contraction is possible, and is arrange | positioned at the ceiling side. A fixing ring is attached to the upper end portion of the large-diameter pipe, and a fastening ring capable of expanding and contracting is inserted into the lower end portion of the small-diameter pipe. The large-diameter pipe and the small-diameter pipe are linked by a link. It is connected. A handle that is rotated is attached to the fastening ring, and a cam mechanism that transmits the amount of rotation of the handle to the fastening ring as an expansion / contraction diameter displacement is provided between the two.

  When installing the struts, the handle is flipped up so that the fastening ring is in a diameter-expanded state. In this state, the small-diameter pipe is lifted up by hand, and the top receiving member provided at the upper end of the ceiling support member is Abut. Thereafter, the handle is pulled down to reduce the diameter of the fastening ring, the fastening ring is fastened and fixed to the small diameter pipe, and the small diameter pipe is pushed up integrally with the fastening ring by the link to the ceiling side. The large diameter pipe and the small diameter pipe are stretched between the ceiling and the floor surface.

JP2003-206640A.

  By the way, in the strut shown in the above-mentioned Patent Document 1, the small diameter pipe and the fastening ring are fastened for the first time by rotating the handle, and the small diameter pipe is linked by further rotating the handle. Since it is configured to abut against the ceiling by the action, for example, when the small diameter pipe is lifted by hand with the handle flipped up, if the hand is released, the small diameter pipe will hold something. The action does not work either, and the small diameter pipe descends, and as a result, it is impossible to install the column. For this reason, when installing the column, it is necessary to rotate the handle while keeping the small diameter pipe lifted and held by hand.

  However, when a parallel operation of “a small diameter pipe holding operation” and “a handle turning operation” is required in this way, for example, to perform the operation alone, a corresponding physique and force are required. Therefore, for example, if the operator is a powerless woman or an elderly person, it may be difficult to operate, and in some cases it may be necessary to ask for the assistance of others, etc. There is a problem in terms of ease of operation.

  Moreover, it is requested | required that a support | pillar should be erected vertically as much as possible between a ceiling and a floor surface from a viewpoint of ensuring the installation intensity | strength or maintenance of aesthetics. For this reason, when installing the column, it is necessary to confirm the verticality by, for example, visual observation from a separated position or by placing a level on the column, but in the column of Patent Document 1, Since this is a structure that drops when a hand is released from the small-diameter pipe, for example, at least two people are required to confirm the verticality by visual observation from the separated position, and the installation work cost is high. On the other hand, if this is done alone, it will be seen from the approaching position, so the accuracy of checking the verticality will be impaired, and there will be problems with respect to the installation strength and aesthetics of the columns.

  SUMMARY OF THE INVENTION The present invention has been made with the object of providing a strut that can be installed easily and easily with high workability.

  The present invention employs the following configuration in order to solve the above problems.

  In the first invention of the present application, the first columnar body and the second columnar body configured to be mutually extendable and contractable are provided, and the first columnar body and the second columnar body are extended in the extending direction between the floor surface and the ceiling surface. In the struts that are erected in a stretched state, the rack gear fixed to either one of the first pillar and the second pillar is provided on one of the other sides and rotated by an operating member. And a first tensioning portion provided on the other side of the first pillar body and the second pillar body, and being locked to the rack gear in the first position. A latch member that restricts the relative displacement of the body and the second column body in the contracting direction and allows the relative displacement in the extending direction, and holds the rack gear in a non-locked state in the second position. Provided with a latch mechanism, and relative extension of the first pillar body and the second pillar body. Thus, there is provided a thrust adjusting section for adjusting the thrust generated between both ends in the extension direction by the expansion and contraction displacement of the spring member, and the operation member is a first gear that disengages the pinion gear from the rack gear. It is possible to operate between an operation position and a second operation position in which the pinion gear is engaged with the rack gear to extend the first column 1 and the second column by a predetermined amount, and from the first operation position. The latch member is forcibly switched from the first position to the second position at a third operation position set immediately before the second operation position when operated to the second operation position. It is a feature.

  According to a second invention of the present application, in the strut according to the first invention, the rack gear is axially disposed on one side of the outer peripheral surface of one of the first pillar body and the second pillar body. In the groove provided in the extended state, the mounting position in the extending direction is fitted and fixed so as to be adjustable.

  In a third invention of the present application, in the strut according to the second invention, the groove is provided on the other side of the first pillar body and the second pillar body in an area where the rack gear does not exist. The feature is that the protrusions can be engaged.

  According to a fourth invention of the present application, in the projecting strut according to the third invention, the projection is engaged with the rack gear in the expansion / contraction direction of the first pillar body and the second pillar body. The present invention is characterized in that the reduction displacement of the column body and the second column body is regulated.

(A) The struts according to the first invention of the present application When the struts are installed, the struts are placed on the floor surface in a standing state, and the operation member is set at the first operation position. At the same time, the latch member is set to the first position. Then, the first column body 1 and the second column body 2 are manually displaced relative to each other in the extending direction to extend the projecting strut, and the upper end side thereof is brought into contact with or close to the ceiling surface (hereinafter referred to as “zero point”). It is called “setting operation”). In this case, since the latch function of the latch member is continuously working during the extension operation, even if the hand is released from the tension column during the extension operation, it will not be displaced (dropped) to the reduction side. The extended state is maintained.

  After the zero point setting operation is completed, the installation position of the strut post and the verticality thereof are confirmed.In this case, the extension state of the strut post is held by the latch member as described above. This can be easily confirmed at a position away from the strut.

  Here, if it is considered that the installation position of the struts or the verticality is not appropriate, the upper end of the struts, that is, the ceiling side of the first column and the second column In the state where the upper end portion of the one located at the position is held by hand, the latch member is temporarily switched from the first position to the second position, the projecting strut is slightly reduced, and the upper end portion is separated from the ceiling surface. Then, the installation position and the verticality are corrected, and then the latch member is switched to the first position again and the zero point setting operation is performed.

  When the zero point setting operation is completed, the operation member is operated from the first operation position to the second operation position. By the operation of the operation member, the pinion gear meshes with the rack gear, and the first column body 1 and the second column body 2 are further extended and displaced as the operation member rotates. Is stretched between the floor surface and the ceiling surface to generate a predetermined thrust. In that case, the thrust tension adjusting section works and is adjusted so that the thrust tension does not become excessive. Therefore, the tension strut does not damage the ceiling surface (i.e., the ceiling surface is not damaged). Between the floor surface and the ceiling surface in a state in which a necessary tension is maintained between the floor surface and the ceiling surface.

  When the operation member is set to the second operation position, the installation operation of the strut is completed. At this time, the operation member is moved to the third operation position set immediately before the second operation position. When reaching, the operating member forcibly switches the latch member from the first position to the second position. Therefore, for example, if the latch member is held at the first position even when the operation member is set at the second operation position, the thrust is applied to the latch member. Cannot be switched from the first position to the second position afterwards, and it may be difficult to remove the struts installed in a stretched state. However, as described above, if the latch member is switched to the second position before the operation member is set to the second operation position, the above problem can be avoided and the tension installed in the tension state. It becomes possible to remove the column.

  Thus, according to the strut column according to the first invention of the present application, the combination of the strut tension applying portion and the latch mechanism portion allows the strut strut to be held without being attached to the hand and holding it. Since the stretched state of the tension strut can be maintained and the installation work can be performed in that state, for example, as shown in Patent Document 1, until the fastening of the small diameter pipe and the fastening ring is completed Compared to the structure that needs to hold the small-diameter pipe by hand and avoid its fall, the installation work of the strut can be done easily and easily. It is possible to obtain extremely advantageous effects in terms of workability and work cost.

  Moreover, by providing the above-mentioned tension adjusting section, it is possible to ensure a good installation strength without damaging the ceiling surface of the above-mentioned tension column, high reliability in use of the above-mentioned tension column, and Safety is ensured.

(B) The strut according to the second invention of the present application According to the strut according to the present invention, the following specific effects can be obtained in addition to the effects described in (a) above. That is, according to the present invention, the rack gear is extended in a groove provided in an axially extending state on one side of the outer peripheral surface of either the first column or the second column. The mounting position in the direction is fitted and fixed so as to be adjustable.

  Here, the height between the ceiling and floor where the upper and lower ends of the struts are supported is not constant, and even if they are in the same building, they are often different for each installation location. The amount of extension required to generate the required thrust on the column, that is, the amount of extension based on the operation of the operation member after the zero point is set, is substantially constant without being substantially affected by the size of the height. Is done. Therefore, if the mounting position of the rack gear can be adjusted as in the present invention, the required thrust can be obtained while minimizing the length dimension of the rack gear, and as a result, the rack gear, the extension As a result, the struts can be reduced in size, weight, and cost.

  The rack gear mounting position corresponds to that the rack gear can mesh with the pinion gear in the zero point setting state (that is, at the time when the operation member starts to rotate from the first operation position to the second operation position side). The rack gear can be engaged with the pinion gear), and below the corresponding position, the amount of movement of the rack gear corresponding to the operation between the first operation position and the second operation position of the operation member (that is, the operation member) It is only necessary to set the rack gear at a position longer than the length corresponding to the amount of expansion / contraction of the above-mentioned strut strut obtained by the above operation. After performing the zero point setting operation by setting the attachment position, the operation member is rotated from the first operation position to the second operation position side, so that the above-mentioned struts can be reliably extended and the required protrusions can be obtained. Tension can be obtained, and appropriate installation strength of the above-mentioned strut support column is ensured.

  Further, the rack gear is fitted and fixed in the groove, in other words, the rack gear does not extend outward from the outer peripheral surface of one side of the first column body or the second column body, The first columnar body and the second columnar body are set to about the diameter required for strength performance, and this can avoid an unnecessarily large diameter, which is advantageous in terms of cost reduction.

(C) The strut according to the third invention of the present application According to the strut according to the present invention, the following specific effects can be obtained in addition to the effects described in (b) above. That is, in the present invention, since the protrusion provided on the other side of the first pillar body and the second pillar body can be engaged in the region of the groove where the rack gear does not exist, The first pillar body 1 and the second pillar body 2 are positioned in the circumferential direction (rotation prevention) by the cooperation of the grooves, and the guide action is performed in the relative expansion and contraction direction. As a result, the rack gear and the pinion gear correspond to each other. The relationship is always properly maintained, and the reliability in the expansion / contraction operation of the struts is ensured.

(D) The strut according to the fourth invention of the present application According to the strut according to the present invention, the following specific effects can be obtained in addition to the effects described in (c) above. In other words, in the present invention, the protrusions engage with the rack gear in the extending and contracting direction of the first column body and the second column body, so that the reduction displacement of the first column body and the second column body is restricted. In any case, for any reason, the reduction displacement of the first columnar body and the second columnar body due to the meshing of the rack gear and the pinion gear, or the engagement between the rack gear and the latch member Even if the restriction of the reduction displacement of the first pillar body and the second pillar body due to the above becomes ineffective, and the first pillar body and the second pillar body are inadvertently reduced and displaced, the reduction displacement is caused by the rack gear and the protrusion. Is stopped at the time of engagement, and is not further reduced and displaced, ensuring operational safety and reliability.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

  A: Basic structure of the strut

  In FIG. 1, the installation state of the strut support Z which concerns on embodiment of this invention is shown. The struts Z are erected in a vertically stretched state between the floor surface F and the ceiling surface C, and the first column 1 positioned on the floor surface F side, 1 is a telescopic column having a second column 2 which is fitted in the column 1 so as to be extendable and is located on the ceiling surface C side. P is provided. The upper end portion of the second column 2 is provided with a later-described thrust adjusting portion Q, and the thrust adjusting portion Q is provided with a plate-like ceiling abutting member 4. Further, a handle 44 (corresponding to an “operation member” in the claims) is provided between the upper end portion of the first column 1 and a portion near the lower end of the second column 2 inserted therein. A later-described thrust applying portion R provided with is provided.

  The struts Z allow the lower end of the first column 1 to be grounded to the floor surface F via the grounding portion P, while the upper end of the second column 2 is connected to the ceiling contact material. 4 and the projecting tension adjusting portion Q are installed in contact with the ceiling surface C. At this time, projecting tension is applied between both ends of the strut post Z by the projecting tension applying portion R. In addition, when the thrust tension is adjusted to an appropriate value by the thrust tension adjusting portion Q, the tension strut Z has a frictional force acting between the floor surface F and the grounding portion P, and the ceiling surface. Due to the frictional force acting between C and the ceiling contact material 4, it is installed with high installation strength between the floor surface F and the ceiling surface C.

  Here, the installation procedure of the above-mentioned strut support Z will be briefly described with reference to FIG.

  First, the length dimension of the projecting column Z (the distance dimension between the lower surface of the grounding portion P and the upper surface of the ceiling contact member 4) is made to correspond to the height dimension H1 between the floor surface F and the ceiling surface C. Thus, an initial set length H2 shorter than the dimension H1 by a predetermined dimension H3 is set in advance (an operation for setting the mounting position of the rack gear 26 described later). The projecting column Z set to the initial set length H2 is erected at a predetermined installation position, and the second column 2 is pulled upward from the first column 1 and lifted to lift the ceiling abutment. The contact material 4 is brought into contact with the ceiling surface C (temporary work of the struts Z to be described later).

  In this temporary state, no tension is generated in the projecting strut Z, and the tension is generated only when the second column 2 is further displaced from here. Accordingly, the ceiling surface C is a base point for generating a tangential tension, that is, a zero point position. Hereinafter, this operation is referred to as a zero point setting operation (described in detail later).

  After the zero point setting operation is completed, the projecting tension applying portion R is operated to further raise the second column 2 by a predetermined amount to generate a projecting tension between both ends of the projecting strut Z. The thrust tension adjusting section Q is adjusted so that the thrust tension does not become excessive. That is, the second column 2 is further pushed up by the dimension H4 from the zero point position by the thrust applying portion R, and the displacement of the second column 2 is absorbed as the elastic displacement in the thrust adjusting portion Q ( As will be described in detail later, the elastic repulsive force generates a required thrust.

  The tension strut Z installed in this way can be used alone as a handrail extending in the vertical direction, for example, a stand-up assisting handrail, etc. In addition, it is used as a supporting column for the cantilevered handrail M, a supporting column for the both-side-supported handrail N that is placed between the other column Y, and the like.

B: Specific Configuration of Strut Support Post Z Based on the basic configuration described above, the specific structure and installation method of the support post Z will be described in detail below with reference to the accompanying drawings.

B-1: First pillar 1
As shown in FIGS. 1 to 3, the first pillar body 1 is constituted by a pipe body having a predetermined length, and an end face material 8 is attached to the lower end thereof. Then, the following grounding portion P is attached to the end face material 8.

  As shown in FIGS. 2 and 3, the grounding part P includes a grounding plate 9 and a cover 11. The ground plate 9 is a disc having a predetermined diameter, and a work hole 16 is provided at the center thereof. Further, a fixing plate 10 is attached to the ground plate 9 so as to cover the work hole 16, and the end face material 8 on the first pillar 1 side is brought into contact with the fixing plate 10. The ground plate 9 is fixed to the lower end of the first column 1 by fastening these with the fixing bolt 16.

  As shown in FIGS. 4 and 5, the cover 11 has a reverse funnel-shaped body provided with an insertion hole 11a at the center of the outer wall 11b. The inner surface of the outer wall 11b has a bent wall shape. Four ribs 12 having a shape are integrally formed so as to surround the insertion hole 11a, and a pair of left and right engaging claws 13 are formed.

  As shown in FIGS. 2, 3 and 6, the cover 11 is attached so as to cover the ground plate 9 from above with the first pillar body 1 inserted through the insertion hole 11a. It is done. At this time, the fixing plate 10 on the ground plate 9 side is fitted into the facing space of the ribs 12 on the cover 11 side, thereby positioning the cover 11 and the ground plate 9 in the circumferential direction. While preventing the rotation, the locking claws 13 are locked to the left and right edges of the fixing plate 10 to prevent the locking plate 10 from coming off in the vertical direction.

  The second column 2 described below is inserted into the first column 1 so as to be relatively displaceable in the axial direction, and the protruding tension applying portion R is provided at the upper end of the first column 1. These will be described later.

B-2: Second pillar 2
As shown in FIGS. 1, 7, and 8, the second column 2 is a tube having a predetermined length formed by drawing or the like, and both ends thereof are cut off and the outer periphery thereof. A mounting groove 20 is formed on one side of the surface so as to extend over the entire length in the axial direction. The mounting groove 20 is for mounting an adjusting rod 25 having a rack gear 26, which will be described later, in a fitted state, and guide grooves 21 are formed on both side walls thereof. A plurality of bolt holes 22 are formed in the bottom portion 20 a of the mounting groove 20 at a predetermined interval in the extending direction of the mounting groove 20.

  On the other hand, the following tension adjustment part Q is attached to the upper end of the second column 2. As shown in FIG. 9, the projecting tension adjusting portion Q includes a cap 31 formed of a tubular body that is externally fitted to the upper end portion of the second column 2 so as to be slidable relative to the upper end. An end face member 32 is fixed to the upper end of the cap 31, and elongated holes 34 extending in the axial direction of the cap 31 are provided at two positions on the outer peripheral wall that are opposed to each other in the radial direction across the axis. Each is formed. The pair of elongated holes 34 are respectively inserted into the outer peripheral portions of both ends of a pin 35 that penetrates the spring receiver 37 inserted in the cap 31 in the radial direction, and the end face member 32 and the spring receiver 37. A coil spring 33 is mounted between them.

  The ceiling contact member 4 is fixed to the end face member 32 of the cap 31 by a fixing bolt 36. As shown in FIG. 1, the ceiling abutting material 4 is formed of a long rectangular plate material having a predetermined length, and its upper surface serves as an abutting surface for the ceiling surface C.

  The protruding tension adjusting portion Q configured as described above is fitted and arranged on the upper end portion of the second column body 2 in a state where the spring receiver 37 is in contact with the upper end surface of the second column body 2. . In a state where no pressing force (push-up force) is applied from the second column body 2 side, the pin 35 is located on the lower end side of the long hole 34 as shown in FIG. 9, and the coil spring 33 is The coil spring 33 is in the most extended state, and generates a spring force that suppresses rattling of the spring receiver 37.

  From this state, when the second columnar body 2 is pushed up and the ceiling contact member 4 comes into contact with the ceiling surface C (that is, the zero point setting operation state), the coil spring 33 is reduced and displaced from that point. A spring force corresponding to the amount is generated, and the maximum spring force is generated when the maximum displacement amount S is reached. The spring force generated in the coil spring 33 acts between the floor surface F and the ceiling surface C as the projecting tension of the projecting strut Z, and the floor surface F and the grounding plate 9 of the grounding part P by the projecting tension. A frictional force is generated between the ceiling surface C and the ceiling abutting member 4 so that the struts Z are installed and fixed in a stretched state.

  Thus, the displacement of the second column 2 is converted into the compression displacement of the coil spring 33, and the spring force corresponding to the amount of the compression displacement acts as a projecting tension. A situation in which the displacement directly acts on the ceiling surface C as an excessive protrusion tension and causes the ceiling surface C to be damaged is surely avoided. In other words, by providing the thrust tension adjusting portion Q, the ceiling surface C is not damaged, and an appropriate thrust tension necessary for fixing and holding the tension strut Z can be secured. .

B-3: Tension applying portion R
The projecting tension applying portion R constitutes a main portion of the present invention together with the latch mechanism portion T described below. At the upper end portion of the first column 1, the first column 1 and the second column 1 are provided. It is provided between the column bodies 2. That is, as shown in FIGS. 10 to 12, the projecting tension applying portion R includes a joint body 60, an adjustment rod 25 provided with the rack gear 26, and a handle 44 provided with a pinion gear 45.

  The joint body 60 includes a cylindrical portion 61 having an inner diameter dimension that can be fitted onto the upper end portion of the first column 1 and a pair of extending portions that extend in parallel from one side of the cylindrical portion 61 at a predetermined interval. 62 and 63, and the first pillar 1 is attached to the first pillar 1 by fitting the engagement hole 61 into the upper end of the first pillar 1. In order to prevent the joint body 60 from coming off from the first column body 1, as shown in FIG. 14, a protrusion 57 of a stopper member 55, which will be described later, attached to the joint body 60 side is provided by the first column body 1. This is done by being inserted into a through hole 14 formed in the peripheral wall.

  One end 44a of the handle 44 is pivotally supported via a fulcrum pin 41 at the upper position of the pair of left and right extending portions 62, 63 of the joint body 60, and teeth are formed on the one end 44a only approximately half a circumference. The pinion gear 45 is fixed coaxially with the fulcrum pin 41, and the pinion gear 45 is also rotated integrally with the handle 44 by a turning operation. An engagement pin 48 projects from the side surface of the pinion gear 45 where the handle 44 is not attached. The engaging pin 48 is engaged with a latch member 42 (described later) by rotating the handle 44 to change its position.

  As shown in FIG. 1, the handle 44 has a first operation position (see FIG. 16) that is flipped upward around the fulcrum pin 41, and a second state that hangs downward from the fulcrum pin 41. A rotation operation is performed between the operation positions (see FIG. 10), and a third operation position (see FIG. 23) is set immediately before the second operation position.

  On the other hand, as described above, the lower end side portion of the second column body 2 is fitted into the upper end portion of the first column body 1, and in this case, the pinion gear 45 is connected to the second column body 2 side. Is engaged with a rack gear 26 of an adjustment rod 25 attached to the rack. That is, as described above, the adjustment rod 25 as shown in FIG. 13 is attached to the attachment groove 20 (see FIGS. 7 and 8) provided on the outer peripheral surface of the second column 2. The adjustment rod 25 is formed of a rod body having a rectangular cross section, and a rack gear 26 is provided on one side surface thereof, and guide protrusions 27 are provided on a pair of side surfaces sandwiching the rack gear 26 in the tooth width direction. Yes. Further, a bolt insertion hole 28 through which the fixing bolt 29 is inserted is provided at the upper end portion of the adjustment rod 25.

  As shown in FIG. 12, the adjustment rod 25 configured as described above is configured so that the rack gear 26 faces outward and the pair of left and right guide protrusions 27 are respectively formed in the guide grooves 21 of the mounting grooves 20. The fitting groove 20 is fitted in the fitted state. Then, the fixing bolt 29 inserted into the bolt insertion hole 28 is selectively screwed into one of the plurality of bolt holes 22 on the mounting groove 20 side to be fixed to the second column 2 side. Accordingly, when the guide protrusion 27 is fitted in the guide groove 21, the guide protrusion 27 functions as a guide in the axial direction of the adjustment rod 25 and also prevents the adjustment rod 25 from being detached from the mounting groove 20. In addition, the fixing bolt 29 fulfills the function of positioning and fixing the adjusting rod 25 in the axial direction of the mounting groove 20, and the adjusting rod 25 is integrated with the second column 2 by both of them. The

  The mounting position of the adjusting rod 25 in the axial direction of the second column 2 can be changed by selecting the bolt hole 22 into which the fixing bolt 29 is screwed. Will be described later.

  By inserting and inserting the second column 2 to which the adjustment rod 25 is attached in this manner into the first column 1, the rack gear 26 of the adjustment rod 25 is moved as shown in FIGS. 11 and 12. Opposing to the pinion gear 45 on the handle 44 side, therefore, by rotating the handle 44, the second column 2 is displaced in the upward direction integrally with the adjustment rod 25, and the second column The body 2 is extracted upward from the first column 1 and as a result, the strut Z is extended.

  In order to expand and contract the extending column Z by rotating the handle 44, the first column 1 and the second column 2 are always connected so that the pinion gear 45 can mesh with the rack gear 26. Although the circumferential positioning is required, the positioning function is such that the protrusion 57 of the stopper member 55 is locked in the bolt hole 22 on the second column 2 side as shown in FIG. As described above, it is realized by the above.

  Here, the relative relationship between the operation position of the handle 44 and the meshing state of the pinion gear 45 and the rack gear 26 will be described.

  As described above, the handle 44 is rotated between the first operation position and the second operation position. In this case, in this embodiment, the handle 44 is set to the first operation position. Then, as shown in FIGS. 16 to 18, the rack gear 26 of the adjustment rod 25 is opposed to the portion where the teeth of the pinion gear 45 are not provided. It can be performed freely without being restricted by the pinion gear 45.

  On the other hand, when the handle 44 is rotated from the first operation position to the second operation position, the pinion gear 45 meshes with the rack gear 26 at the initial stage of rotation as shown in FIG. As the handle 44 is rotated, the second column 2 is pushed upward (see FIG. 23). Such an operation is continued until the handle 44 reaches the second operation position, as shown in FIGS.

  All the turning operations of the handle 44 are performed manually. Then, the position holding at the first operation position is performed by a stopper or a rotation biasing member (not shown). On the other hand, the position holding at the second operation position is performed by the lock member 52 provided in the intermediate portion 44b of the handle 44. That is, as shown in FIG. 14, the lock member 52 is pivotally supported by the fulcrum pin 50 at the intermediate portion 44 b of the handle 44. The lock member 52 includes a push button 52b at one end 52a, and the other end 52c as a latching claw. The lock member 52 is pivotally supported by the fulcrum pin 50 in a state where the push button 52b protrudes outward of the handle 44.

  On the other hand, a stopper member 55 is attached to the joint body 60. The stopper member 55 includes a receiving claw 56 at a position corresponding to the handle 44 lock member 52 in the rotation direction of the handle 44, and the protrusion 57 is provided on the back side thereof. Is fixed to the joint body 60 in a state in which is inserted into the mounting groove 20 of the second pillar body 2 through the through hole 14 provided on the joint body 60 side.

  When the handle 44 is set to the second operation position, the latching claw 52c of the lock member 52 is latched to the receiving claw 56 of the stopper member 55, and thereby the second operation position is set. Position holding is performed. Further, in this position holding state, by pressing the push button 52 b of the lock member 52 and rotating the lock member 52 around the fulcrum pin 50, the latching claw 52 c is moved to the stopper member 55. The handle 44 is detached from the receiving claw 56, and the handle 44 can be turned from the second operation position to the first operation position.

  In this embodiment, in order to prevent the push button 52b from being inadvertently pressed and released from being fixed when the handle 44 is fixed at the second operation position, the handle 44 is used in this embodiment. Is set at the second operation position, the lock pin 51 is attached by penetrating both the extending portions 62 and 63 of the joint body 60 and the handle 44, and the lock pin 51 is used to attach the lock member 52. The rotation to the unlocking side is restricted to prevent the push button 52b from being inadvertently pressed, and the latching function of the latching claw 52c and the catching claw 56 for some reason should be avoided. Even if this is damaged, the rotation of the handle 44 toward the first operation position can be restricted.

B-4: Latch mechanism T
The thrust tension applying portion R is provided with a latch mechanism portion T described below. This latch mechanism T is for restricting the lowering of the second column 2 as necessary, that is, the contraction displacement of the strut Z, as shown in FIGS. The adjustment gear 25 includes a rack gear 26 and a latch member 42 that is pivotally supported by the fulcrum pin 41 adjacent to the pinion gear 45.

  The latch member 42 is formed of a plate-shaped piece, and an operation portion 42a is provided on one end side, and a latch claw 42b that can be engaged with the rack gear 26 is provided on the other end side. Further, the latch member 42 is provided with a ball receiving hole 46 into which a retractable engaging ball 43 provided on the extending portion 63 side of the joint body 60 is engaged. The latch member 42 is always urged by a return spring 47 in a direction in which the latch claw 42 b approaches the rack gear 26.

  The latch member 42 has a second position where the latch claw 42b is not locked to the rack gear 26 as shown in FIGS. 11 and 12, and as shown in FIGS. The position of the latch claw 42b can be changed between the first positions where the latch claws 42b are engaged with the rack gear 26. In the second position, the engagement balls 43 are engaged with the ball receiving holes 46, so that the first position is changed. Two positions are held. Further, the latch member 42 is provided with an engaging portion 42c that can engage with the engaging pin 48 on the pinion gear 45 side. Note that the position of the latch member 42 from the second position to the first position is changed by manually pushing up the operating portion 42a to engage and disengage the engaging ball 43 from the ball receiving hole 46. .

  In the state in which the latch member 42 is set at the first position, the latch pawl 42b is connected to the rack gear 26 in the direction in which the second column 2 is contracted (that is, in the contracting direction of the projecting column Z). In the state where the movement of the rack gear 26 is restricted and the latch member 42 is set at the second position, the latch member 42 does not perform any restriction action on the rack gear 26, and The extending and retracting operation of the strut Z is free.

C: Installation operation and the like of the strut post Z Next, the installation operation and the like of the strut post Z will be described.

C-1: Mounting Operation of Adjustment Rod 25 as Preliminary Operation Here, setting of the mounting position of the adjustment rod 25 on the second column 2 and its operation will be described.

  As described above, the mounting position in the axial direction of the second column 2 of the adjusting rod 25 provided with the rack gear 26 is a plurality of bolt holes provided in the mounting groove 20 of the second column 2. It can be changed by selecting one of 22 and screwing the fixing bolt 29 into the bolt hole 22. Further, when installing the above-mentioned strut column Z, the length dimension of the strut column Z is made to correspond to the height dimension H1 between the floor surface F and the ceiling surface C, and only a predetermined dimension H3 than the dimension H1. It is necessary to set in advance to a short initial set length H2 (see FIG. 1).

  Accordingly, first, as shown in FIGS. 16 to 18, the handle 44 is set to the first operation position, the latch member 42 is set to the second position, and the second column 2 is displaced in the axial direction. Make it possible. At this time, the adjusting rod 25 is fitted in the mounting groove 20 of the second column 2 but is not fixed by the fixing bolt 29.

  In this state, the second pillar body 2 is manually pulled out from the first pillar body 1 so that the upper surface position of the ceiling contact member 4 becomes the initial set length H2. Adjust the length. In this state, the lower end of the adjustment rod 25 is brought into contact with the protrusion 57 of the stopper member 55 as shown in FIG. In this case, the length dimension of the rack gear 26 of the adjustment rod 25 is such that the pinion gear 45 can be engaged with the upper position of the rack gear 26 when the lower end of the adjustment rod 25 is in contact with the protrusion 57. Is set in advance.

  In a state where the lower end of the adjustment rod 25 is in contact with the protrusion 57, the bolt insertion hole 28 formed in the adjustment rod 25 matches any of the plurality of bolt holes 22 formed on the second column body 2 side. If so, the fixing bolt 29 may be screwed in as it is to fix the adjusting rod 25 to the second column 2 side.

  On the other hand, if the bolt insertion hole 28 does not match any of the bolt holes 22, the bolt insertion hole 28 should be matched with the bolt hole 22 located closest to the bolt insertion hole 28. While maintaining the position of the adjusting rod 25, only the second column 2 is moved in the axial direction, and then the fixing bolt 29 is screwed into the matched bolt hole 22 so that the adjusting rod 25 is It fixes to the 2nd pillar 2 side (this state is a state shown in FIG. 16). Thus, the setting and fixing work of the attachment position of the adjustment rod 25 to the second column 2 is completed. It should be noted that the setting and fixing work of the adjustment rod 25 to the second pillar body 2 may be performed in a state where the struts Z are laid on the floor surface F.

C-2: Zero Point Setting Operation Next, the projecting column Z is erected in a state where the projecting column Z is installed and the grounding part P is installed on the floor F. When the strut Z is erected, the handle 44 is set to the first operation position and the latch member 42 is set to the second position in this state, so that the pinion gear 45 and the latch member 42 The movement restricting action of the rack gear 26 does not work, and the second column 2 is subjected to the action of dropping due to its own weight. In this state, the lower end of the adjusting rod 25 is in contact with the protrusion 57. The second pillar body 2 does not fall any further.

Next, as shown in FIGS. 19 to 21, while the handle 44 is held at the first operation position, only the latch member 42 is manually switched from the second position to the first position, and the latch claw 42b is moved. Are engaged with the corresponding teeth of the rack gear 26. Therefore, in this state, the second column 2 can be pulled upward (that is, the protruding column Z can be extended) but cannot move in the direction of contraction.
Next, holding the second column 2 by hand, pulling it up to bring the ceiling abutting material 4 into contact with the ceiling surface C, and setting the zero point of the strut post Z. Even if the second column 2 is released during the zero setting operation or after the zero setting operation is completed, the second column 2 is not dropped by the latch function of the latch member 42, and the zero position is maintained. To do. This completes the temporary work of the struts Z.

C-3: Projection tension application operation Next, the handle 44 is rotated from the first operation position to the second operation position. Then, as shown in FIG. 22, the pinion gear 45 meshes with the rack gear 26, and the second pillar body 2 is gradually pushed upward as the handle 44 rotates. When the handle 44 reaches the third operation position set immediately before the first operation position, as shown in FIG. 23, the engagement pin 48 provided on the pinion gear 45 is connected to the ceiling contact member 4. Is engaged with the engaging portion 42c on the latch member 42 side.

  Therefore, when the handle 44 is further rotated from this state, the latch member 42 is rotated from the first position to the second position by the engagement pin 48, and the latch claw 42b of the latch member 42 is The latch member 42 is forcibly separated from the rack gear 26 and the latch function of the latch member 42 disappears.

  Finally, when the handle 44 reaches the second operation position, as shown in FIGS. 10 to 12, the second column 2 is pushed upward by the pinion gear 45, and this The state is maintained by the latching action of the latching claw 52 c and the receiving claw 56 of the lock member 52 and the locking action of the lock pin 51.

  When the handle 44 is set to the second operation position and the second column 2 is raised as described above, the thrust adjusting portion Q provided on the upper end side of the second column 2 is The upward displacement of the second column 2 acts as an appropriate thrust between the floor surface F and the ceiling surface C, and the ground plate 9 of the floor surface F and the grounding portion P is affected by the thrust. A frictional force is generated between the ceiling surface C and the ceiling abutting member 4, so that the struts Z are installed and fixed in a stretched state. This completes the installation work of the struts Z.

  Note that when the handle 44 is set to the second operation position, the latch member 42 is set to the second position. For example, when the set strut Z is removed, the lock member 42 is locked. The pin 51 is removed, the push button 52b of the lock member 52 is pressed, the latching action of the latching claw 52c and the catching claw 56 is released, and the handle 44 is moved from the second operation position to the first operation position. When it is turned to the side, the second pillar body 2 is lowered to the initial position, and the ceiling abutting member 4 is separated from the ceiling surface C. Therefore, the projecting column Z can be easily removed from the standing state. Can do.

C-4: Specific operational effects In the strut strut Z of this embodiment, a combination of the strut tension imparting portion R and the latch mechanism portion T does not keep the strut strut Z attached to the hand. Since the extension state of the strut Z can be maintained and installation work can be performed in that state, for example, as shown in Patent Document 1, the small diameter pipe and the fastening ring can be fastened. Compared to a structure in which it is necessary to hold the small-diameter pipe by hand until it is completed and to prevent its falling, the installation work of the strut Z can be performed easily and easily. This is extremely advantageous in terms of workability and work cost in installation work.

D: Others (D-1) In this embodiment, when the protrusion tension applying portion R is provided between the first column body 1 and the second column body 2, the handle 44 is disposed on the first column body 1 side. The adjustment rod 25 is provided on the second column body 2 side, but the present invention is not limited to such a configuration. For example, the handle 44 is disposed on the second column body 2 side. The collar 25 can also be provided on the first column body 1 side.

  (D-2) In this embodiment, the thrust tension adjusting portion Q is provided on the upper portion of the second column 2, but the present invention is not limited to such a configuration. The part Q can also be provided on the first column body 1 side.

It is an installation state explanatory view of the strut according to the first embodiment of the present invention. It is the II-II expanded sectional view of FIG. It is III-III expanded sectional drawing of FIG. It is the IV-IV arrow line view of FIG. It is VV sectional drawing of FIG. It is a VI-VI arrow line view of FIG. It is an enlarged front view of the 2nd pillar shown in FIG. It is VIII-VIII sectional drawing of FIG. It is an expanded sectional view of the IX part of FIG. It is an expanded sectional view of the X section of FIG. It is an enlarged view of the XI part of FIG. It is a XII-XII arrow line view of FIG. It is a whole perspective view of the rack gear shown in FIG. It is an enlarged view of the XIV part of FIG. It is XV-XV sectional drawing of FIG. FIG. 11 is a cross-sectional view illustrating a state in which an operation member is flipped up from the state illustrated in FIG. 10. It is an enlarged view of the XVII part of FIG. It is XVIII-XVIII expanded sectional drawing of FIG. It is sectional drawing which shows a state when operating a latch member and performing zero point setting operation from the state shown in FIG. It is an enlarged view of the XX part of FIG. It is XXI-XXI sectional drawing of FIG. It is sectional drawing which shows a state when a handle | steering-wheel is rotated downward from the state shown in FIG. It is sectional drawing which shows a state when the handle | steering-wheel is further rotated downward from the state shown in FIG.

Explanation of symbols

1 .. 1st column body 2 .. 2nd column body 3 .. Joint 4 .. Ceiling contact material 8 .. End face material 9 .. Grounding plate 10 .. Fixing plate 11 .. Cover 12 .. Rib 13 · Claw 14 · · Through hole 19 · · Perimeter wall 20 · · Mounting groove 21 · · Guide groove 22 · · Bolt hole 25 · · Adjustment rod 26 · · Rack gear 27 · · Guide protrusion 28 · · Bolt insertion hole 29 · · Fixing bolt 31 · · Cap 32 · · End material 33 · · Coil spring 34 · · Long hole 35 · · Pin 36 · · Fixing bolt 37 · · Spring support 39 · · Presser material 41 · · Support pin 42 · · Latch Member 43 ·· Engaging ball 44 · · Handle 45 · · Pinion gear 46 · · Ball receiving hole 47 · · Return spring 48 · · Engagement pin 50 · · Support pin 51 · · Lock pin 52 · · Lock Member 55 ·· Stopper member 56 ·· Claw 57 ·· Protrusion 60 ·· Joint body 61 · · Tube portion 62 · · Extension portion 63 · · Extension portion C · · Ceiling surface F · · Floor surface P · · Grounding part Q ・ ・ Tension adjustment part R ・ ・ Tension application part T ・ ・ Latch mechanism part Z ・ ・ Tension strut

Claims (4)

The first columnar body and the second columnar body that are configured to be stretchable with respect to each other are provided, and the first columnar body and the second columnar body are erected in a state where they are stretched in the extending direction between the floor surface and the ceiling surface. A strut to be made,
A thrust applying portion provided with a rack gear fixed to either one of the first column and the second column and a pinion gear provided on either side and rotated by an operation member;
Relative to the reduction direction of the first pillar and the second pillar by being provided on the other side of the first pillar and the second pillar and being locked to the rack gear at the first position. A latch mechanism that includes a latch member that restricts the displacement and allows a relative displacement in the extension direction, and holds the rack gear and the non-locking state in the second position;
A tension adjusting section for adjusting the tension generated between both ends of the first column body and the second column body in accordance with the relative extension of the first column body and the second column body by the expansion and contraction displacement of the spring member;
The operating member is configured to extend the first column 1 and the second column by a predetermined amount by engaging the pinion gear with the rack gear and a first operating position where the pinion gear is not engaged with the rack gear. The latch member is operable between the second operation positions, and the latch member is set at a third operation position set immediately before the second operation position when operated from the first operation position to the second operation position. A strut that is configured to forcibly switch from the first position to the second position. In claim 1,
The mounting position of the rack gear in the extending direction is adjusted in a groove provided in an axially extending state on one side of the outer peripheral surface of one of the first columnar body and the second columnar body. A strut that is fitted and fixed as possible. In claim 2,
A strut that is provided with a protrusion provided on the other side of the first pillar and the second pillar in an area of the groove where the rack gear does not exist. In claim 3,
The protrusion is configured to restrict a reduction displacement of the first column body and the second column body by engaging with the rack gear in an expansion / contraction direction of the first column body and the second column body. Strut strut characterized by.

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