JP5637372B2 - Bed back lifting device - Google Patents

Description

  The present invention relates to a bed back raising device having a back raising function for lifting a user's back lying on the bed with respect to the lower body, and in particular, a lumbar support function that reduces the pressure on the abdomen by curving the user's waist when raising the back. The present invention relates to a bed back raising device having

  As a bed back raising device, during the back raising operation to lift the back of the user lying on the bed against the lower body, the bottom near the waist of the bottom supporting the user moves in a direction to warp the waist, and the user's abdomen The thing which can reduce a feeling of pressure is disclosed (patent document 1). According to this, during the back raising operation, the rotating roller functioning as a contact provided separately from the back raising drive arm moves over the cam while moving in conjunction with the back raising drive arm. A lumbar support function that pushes up and urges the user's abdomen by bending the waist (pelvis) is obtained, and the abdominal pressure can be further reduced by warping the pelvis.

  Furthermore, as a bed back raising device, lowering the buttocks before raising the back, lifting the waist, and then entering the back raising operation allows the back to be raised with the pelvis raised, reducing the feeling of pressure on the abdomen. What can be done is disclosed (Patent Document 2).

JP 2005-237493 A JP 2002-172144 A

  In such a bed back raising device that lifts the back of the user lying on the bed with respect to the lower half of the body, a rotating roller that functions as a contact is used for the lumbar support in the initial stage immediately after the back raising operation of the back raising drive arm is started. Before hitting the bottom, a portion other than the rotating roller (slider) of the lumbar support portion sometimes hits the lumbar support bottom. In this case, a smooth lumbar support operation cannot always be obtained.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bed back raising device that can smoothly move to a lumbar support operation at the beginning of the back raising operation of the back raising drive arm.

The basic configurations common to the aspects 1 to 3 of the bed back raising device according to the present invention include: a base that constitutes the bed; a back bottom that is provided on the base and supports a user's back lying on the bed; A bottom frame that supports a lumbar support bottom facing at least the user's waist side, and a back raising mechanism that lifts the back bottom together with the bottom frame so as to lift the user's back against the user's lower body,
(I) The back raising mechanism includes a back raising drive arm whose base end is pivotally supported on the base body and whose tip is raised to lift the back bottom against the lower body of the user; And a back-up drive source for turning in the back-down direction, and a back end for turning in the back-up direction and the back-down direction following the turning of the back-up drive arm, with the base end pivotally supported by the base. With a raised follower arm,
(Ii) The back-up follower arm operates the lumbar support bottom with respect to the bottom frame so that the user's waist is bent toward the abdomen side, and the back-up mechanism of the back-up mechanism is used as the lumbar support bottom. It has a lumbar support part with contacts that can slide along
(Iii) The lumbar support bottom has a rail portion extending toward the lumbar support bottom while the back raising drive arm approaches or contacts the contactor of the lumbar support portion at the beginning of the back raising operation. Have. The initial stage of the back-up operation refers to a stage until the back bottom is inclined at a predetermined angle (for example, an arbitrary value within a range of 1 to 20 ° or a range of 2 to 15 °) with respect to the horizontal plane of the bed.

According to the basic configuration common to aspects 1 to 3 of the bed back raising device according to the present invention,
(I) back lifting mechanism includes a back-raising drive arm for lifting tip base end portion is pivotally supported pivotably on substrate relative to the lower body of the user back bottom, back lifting direction back lifting drive arm A back-up drive source for turning in the back-down direction, and a back-up follower for pivoting in the back-up direction and back-down direction following the back-up drive arm, with the base end pivotally supported by the base body And an arm.
(Ii) The back-up driven arm has a contact that can contact the bottom for the lumbar support. Here, the contactor operates the lumbar support bottom with respect to the bottom frame so that the user's waist is bent and biased toward the abdomen, and the lumbar as the back raising operation of the back raising mechanism progresses. It is slidable along the bottom for support.
(Iii) The lumbar support bottom has a rail portion. The rail part approaches or contacts the contact of the lumbar support part at the beginning of the back raising operation of the back raising drive arm, and extends toward the lumbar support bottom. Thus, at the beginning of the back raising operation of the back raising drive arm, the contactor such as the rotating roller of the lumbar support part and the rail part face each other and can contact each other. For this reason, when the back raising operation of the back raising drive arm is started, the back raising driven arm moves together with the back raising drive arm in the back raising direction. At this time, the contactor such as the rotating roller of the lumbar support part moves in the back-up direction together with the back-up follower arm. In this case, a contact such as a rotating roller facing the rail portion of the lumbar support portion moves along the rail portion, and further smoothly moves from the rail portion to the lumbar support bottom. For this reason, it is suppressed that parts other than a slider, such as a rotating roller of a lumbar support, hit the lumbar support bottom at the beginning of the back raising operation of the back raising drive arm. As a result, a smooth lumbar support operation can be obtained at the beginning of the back raising operation of the back raising drive arm.

The bed may be a type that can adjust the height position of the frame so that it can be raised or lowered, or a fixed type that cannot adjust the height position of the frame so that it can be raised or lowered.
According to the bed back raising device according to aspect 1, in the basic configuration common to aspects 1 to 3, the lumbar support portion includes a support member having a first arm and a second arm that intersect each other, a first arm, One of the second arms is provided with a contact provided so as to be idle with respect to the support member. In this case, according to the bed back raising device according to aspect 1, in the basic configuration common to aspects 1 to 3, the support member of the lumbar support portion is the lumbar support bottom during the back raising operation of the back raising drive arm. The lumbar support part is provided on the back-up driven arm so that the idler contact of the lumbar support part comes into contact with the rail part preferentially rather than contacting. In this case, when the back-up drive arm is in the back-up position, the idler contact of the lumbar support part has priority over the rail part over the support member of the lumbar support part in contact with the bottom for the lumbar support. To touch. For this reason, the noise which generate | occur | produces because the support member of a lumbar support part contacts the bottom for lumbar support is suppressed.
According to the bed back raising device according to aspect 2, in the basic configuration common to aspects 1 to 3, the lumbar support portion has a lumbar support position that contacts the contact with at least the lumbar support bottom of the back bottom. The lumbar support bottom can be switched to a release position where the lumbar support position is released without contacting the contactor. When the lumbar support part is switched to the lumbar support position, when the back drive arm is raised, the lumbar support bottom near the waist out of the bottom that supports the user pushes the user's waist to the user's belly. Press toward the side. In this case, the user's waist is slightly warped forward, the user's posture is prevented from leaning forward, and the feeling of pressure on the user's abdomen is reduced. However, depending on the user's physical condition, it may be preferable to release the lumbar support position. In such a case, the lumbar support part is switched to the release position. In this case, when the back drive arm is raised, the lumbar support bottom does not press the user's waist toward the user's ventral side.
According to the bed back raising device according to aspect 3, in the basic configuration common to aspects 1 to 3, the distance between the contact of the lumbar support part and the rail part before the start of the back raising operation of the back raising drive arm is set. A distance adjusting mechanism to be adjusted is provided on at least one of the rail portion and the lumbar support bottom. In this case, the distance between the contact of the lumbar support part and the rail part before the start of the back raising operation is adjusted. As a result, the timing for demonstrating the lumbar support function at the beginning of the back raising operation is adjusted.

  According to the bed back raising device according to the present invention, as described above, at the beginning of the back raising operation of the back raising drive arm, the contactor such as the rotating roller of the lumbar support portion and the rail portion face each other and face each other. It is possible to contact. For this reason, when the back raising operation of the back raising drive arm is started, the back raising driven arm moves together with the back raising drive arm in the back raising direction. At this time, as the back-up follower arm advances, contacts such as a rotating roller of the lumbar support portion also operate in the back-up direction. In this case, in the initial stage of the back-up operation, the contact of the rotating roller or the like facing the rail portion of the lumbar support portion moves along the rail portion, and further smoothly from the rail portion to the lumbar support bottom. Can move to. For this reason, in the initial stage of starting the back raising operation of the back raising drive arm, it is possible to prevent a portion other than the slider such as the rotating roller of the lumbar support from hitting the lumbar support bottom. As a result, a smooth lumbar support operation can be obtained.

It is a side view of the bed apparatus which concerns on Embodiment 1 and is provided with a back raising mechanism. FIG. 2A is a side view of the bed apparatus according to the first embodiment, in which the back raising mechanism is operated in the back raising direction while switching the lumbar support portion to the lumbar support position, and FIG. It is a side view of the bed apparatus which is operating the back raising mechanism in the back raising direction while switching the lumbar support part to the release position. FIG. 3A is a side view of a main part showing a state where the lumbar support part is fixed to the lumbar support position according to the first embodiment, and FIG. 3B is a side view of the lumbar support part from the lumbar support position. FIG. 3C is a side view of the main part showing a state in which the lumbar support part is switched to the release position, and shows a state in the middle of switching to the release position. It is a side view which shows the process which concerns on Embodiment 1 and a back raising drive arm, a 1st back raising driven arm, and a 2nd back raising driven arm operate | move. FIG. 4 is an enlarged view showing, in an enlarged manner, the vicinity of the lumbar support portion in the initial stage when the back raising operation of the back raising drive arm is started according to the first embodiment. FIG. 10 is an enlarged side view showing a back raising mechanism before starting the back raising operation of the back raising drive arm according to the second embodiment. FIG. 10 is an enlarged side view showing the vicinity of a lumbar support portion of a back raising mechanism before starting a back raising operation of a back raising drive arm according to the second embodiment. FIG. 10 is an enlarged side view showing a back raising mechanism immediately after starting the back raising operation of the back raising drive arm according to the second embodiment. FIG. 10 is an enlarged side view showing the vicinity of a rotating roller of a lumbar support portion of a back raising mechanism immediately after starting a back raising operation of a back raising drive arm according to the second embodiment. FIG. 10 is an enlarged side view showing the vicinity of a rotating roller of a lumbar support portion of a back raising mechanism before starting a back raising operation of a back raising drive arm according to the third embodiment. It is a side view which shows the rotation roller vicinity of the lumbar support part of a lumbar support part of a back raising mechanism which completes the back raising operation | movement of a back raising drive arm concerning a reference example . FIG. 10 is an enlarged side view showing a state in which the position of the rail portion is switched to the first position before starting the back raising operation of the back raising drive arm according to the fourth embodiment. FIG. 10 is an enlarged side view showing a state where the position of the rail portion is switched to the second position before starting the back raising operation of the back raising drive arm according to the fourth embodiment.

(Embodiment 1)
1 to 5 schematically show the concept of Embodiment 1 of the present invention. As shown in FIG. 1, the bed back raising device according to the present embodiment includes a base body 100 that constitutes a bed, a back bottom 102 that is provided on an upper frame 101 of the base body 100 and supports a user's back lying on the bed. A bottom 104, a bottom bottom 105 that supports the user's bottom, a thigh bottom 106 that supports the user's thigh, a crus bottom 107 that supports the user's crus, and a bottom frame 110 that supports the back bottom 102 And a back raising mechanism 20A for raising the back bottom 102 so as to lift the user's back against the lower body of the user.

  As shown in FIG. 1, the back bottom 102 is disposed on the bottom frame 110, facing the back side of at least the waist of the user, and a lumbar support bottom 103 for warping the waist (pelvis), and the user's bottom It has a fixed bottom 109 facing the upper side of the back surface portion facing the lumbar support bottom 103 in the back surface. The bottom 103 can swing with respect to the fixed bottom 109 via a pivotal support 102w. Although the lumbar support bottom 103 is held by the bottom frame 110, it can float from the upper surface 100u of the bottom frame 110 (see FIG. 2A). The fixed bottoms 104 and 109 are fixed to the bottom frame 110. As shown in FIG. 1, a space 108 is formed between the lumbar support bottom 103 and the fixed bottom 104. This space 108 makes it easier for the lumbar support bottom 103 to float by eliminating the friction of the bottom 103 that floats when raising the back against the fixed bottom 104. Each of the bottoms 102, 106, 107, 104, 103, and 109 described above may be formed using a resin as a base material, or may be formed in a hollow box shape using a metal such as an iron alloy or an aluminum alloy. In use, a mattress on which a user lies is generally placed on the upper surface of each bottom 102, 106, 107, 104, 103, 109.

  As shown in FIG. 1, the back raising mechanism 20A for raising the user's back includes a back raising drive arm 200 that drives to raise the back bottom 102, and the back raising drive arm 200 in the back raising direction (in the direction of arrow U1). ) And a back raising drive source 210 for driving to turn in the back-lowering direction (arrow U2 direction). The base end portion 200e of the back raising drive arm 200 is pivotally supported on the upper frame 101 of the base body 100 by a pivotal support tool 200r, and a back raising rotary roller 200f (back raising rolling element) is provided at the distal end portion. It is provided so as to be rotatable. The back-up rotating roller 200f rolls along the back surface 109r while supporting the back surface 109r of the back bottom 109 during back-up. A drive arm 213 driven by a back drive source 210 is connected to the base end portion 200 e of the back drive arm 200.

  As shown in FIG. 1, the back drive source 210 has a main body 211 that is driven by fluid pressure or a motor, and a rod 212 that can be expanded and contracted in the directions of arrows B <b> 1 and B <b> 2 with respect to the main body 211. The rod 212 is connected to the drive arm 213 via a pivotal support 212r. When the back raising drive source 210 is driven in the forward direction and the rod 212 is extended in the direction of arrow B1 (back raising direction), the back raising drive arm 200 is swung in the back raising direction (arrow U1 direction) via the drive arm 213. . In the back-up state, when the back-up drive source 210 is driven in the reverse direction and the rod 212 contracts in the direction of arrow B2 (back-down direction), the back-up drive arm 200 is moved through the drive arm 213 in the back-down direction (arrow U2). Turn in the direction).

  As shown in FIGS. 2A and 2B, the back raising mechanism 20 </ b> A has a first back raising driven arm 300 and a second back raising driven arm 400 in addition to the back raising drive arm 200. The second back-up driven arm 400 has a base end portion 400e pivotally supported on the upper frame 101 of the base body 100 via a pivotal support 400r so as to be pivotable in the height direction, and follows the back-up drive arm 200. Then, it turns in the back-up direction and the back-down direction. The front end portion 400f of the second back-up driven arm 400 is pivotally supported on the bottom frame 110 via a pivotal support 400m. As shown in FIGS. 2 (A) and 2 (B), a pin 113 serving as a turning center protruding laterally from the bottom frame 110 is fixed by welding or a fixture. The first back-up driven arm 300 includes a main body arm 310 and a lumbar support portion 350 attached to the front end portion 310f of the main body arm 310. The main body arm 310 is pivotally supported by the upper frame 101 via a pivotal support 310r so that the base end portion 310e of the main body arm 310 is pivotable. ) And turn downward.

  As shown in FIGS. 2 and 3, the lumbar support portion 350 includes a support member 353 that is formed in a substantially U-shape (L-shape) so that the first arm 351 and the second arm 352 are connected by the connecting portion. And an idle rotation that is a rolling element that functions as a contact that is provided on the first arm 351 via a rotation shaft 365 and that can contact at least the back surface 103r of the lumbar support bottom 103 on the waist side of the back bottom 102. The roller 360 and the attachment 380 for detachably attaching to the bottom frame 110 in the state which engaged the support member 353 with the main body arm 310 are provided. The attachment 380 is a bolt having a male screw, but is not limited to this. A nut 382 (see FIGS. 2A and 3B) having a female screw 382c is fixed to the back side of the mounting hole 115 of the bottom frame 110 by welding or a fixture.

  As shown in FIG. 3, the second arm 352 of the support member 353 has a long hole 390 that extends in a straight line for relatively moving the pin 113 when the position of the lumbar support portion 350 is adjusted. In FIG. 3A showing the lumbar support position, the fitting 380 is screwed into the female screw 382c of the nut 382 in a state of being fitted to the other end portion 390f side of the long hole 390. Thus, the lumbar support portion 350 is fixed to the bottom frame 110 while being engaged with the main body arm 310. Thus, in the lumbar support position, the pin 113 is located on the one end 390e side in the length direction of the long hole 390.

  That is, FIG. 2A and FIG. 3A show the lumbar support function in which the lumbar support portion 350 urges the lumbar support position (the user's waist (pelvis) to warp toward the user's ventral side). The position being switched to (position to perform). At the lumbar support position, the back surface 103r of the lumbar support bottom 103 on the waist side of the back bottom 102 is pressed by the roller surface 362 of the rotating roller 360 of the lumbar support portion 350, and the arrow A1 direction against the upper surface 110u of the bottom frame 110 The lumbar support bottom 103 is lifted away from the upper surface 110u of the bottom frame 110 by moving toward the user (the direction toward the user, the direction in which the lower back is bent to the ventral side). According to such a lumbar support position, the user's waist that presses the user's waist to the ventral side is biased in a slightly warped direction (lumbar support state), and the user's posture is bent forward. This suppresses the feeling of pressure on the abdomen of the user on the bed.

  By the way, depending on a user's physical condition etc., it may be preferable not to use the lumbar support function which warps a waist | hip | lumbar part. In this case, the lumbar support unit 350 is switched from the lumbar support position (FIG. 3A) to the release position (FIG. 3C). In this case, as shown in FIG. 3A, in a state where the lumbar support portion 350 is set at the lumbar support position, first, the attachment tool 380 is removed from the attachment hole 115 of the bottom frame 110. After that, as shown in FIG. 3B, the lumbar support portion 350 is moved (slid) upward (Y3 direction) along the bottom frame 110, and the pin 113 and the other end portion 390f of the long hole 390 are applied. . In this case, since the pin 113 and the other end 390f of the long hole 390 come into contact with each other, excessive movement (excessive sliding) of the lumbar support portion 350 is prevented. Thereafter, the lumbar support portion 350 is turned about 180 ° downward along the direction of the arrow A3 with the pin 113 as the rotation center. As a result, as shown in FIG. 3C, the rotating roller 360 that performs the lumbar support function is retracted and stored on the back surface 110r side of the bottom frame 110. In this way, the rotating roller 360 is retracted and stored on the back surface 110r side of the bottom frame 110. In this state, the male screw of the fixture 380 is inserted into the mounting hole 115 of the bottom frame 110 and screwed to the female screw 382c of the nut 382 on the back side of the mounting hole 115. As a result, the lumbar support portion 350 is fixed to the bottom frame 110 in a state of being fixed at the release position. The rotating roller 360 does not interfere with the operations of the back raising drive arm 200, the first back raising driven arm 300, and the second back raising driven arm 400.

  As shown in FIG. 3A, at the lumbar support position, one end portion 390e of the long hole 390 is located on the upper side and faces the pin 113, and the other end portion 390f is located on the lower side and attached to the fixture 380. Face to face. As shown in FIG. 3C, in the release position, the positional relationship is opposite to the lumbar support position, and one end 390e of the elongated hole 390 is located on the lower side and faces the fixture 380, and the other end The portion 390f is located on the upper side and faces the pin 113. This is because the lumbar support portion 350 is turned about 180 ° in the direction of the arrow A3. In this way, the fixture 380 and the attachment hole 115 (nut 382) can be shared by the lumbar support position and the release position, and can be made singular, which is advantageous in simplifying the attachment structure.

  Here, FIG. 2B and FIG. 3C show the release position. At the release position, the rotating roller 360 is retracted backward (in a direction away from the user's waist) with respect to the bottom frame 110. For this reason, the roller surface 362 of the rotating roller 360 is not in contact with the back surface 103r of the lumbar support bottom 103 on the waist side, and the lumbar support bottom 103 moves in the release direction (arrow A2 direction), and the user It is kept away from the lower back. In such a release position, as shown in FIG. 3C, the rotating roller 360 is not in contact with the back surface 103r of the lumbar support bottom 103, and the pin 113 is the other end 390f in the length direction of the long hole 390. Located on the side.

  Thus, according to the present embodiment, the direction of the lumbar support portion 350 can be changed using the long hole 390. When the lumbar support part 350 is switched from the lumbar support position to the release position, the lumbar support part 350 is attached to the back raising mechanism 20A. For this reason, when the lumbar support function is not used, the risk of losing the lumbar support portion 350 can be solved. When the lumbar support function is exhibited, the lumbar support unit 350 is switched to the lumbar support position. In this state, when the back raising drive source 210 is driven in the forward direction and the rod 212 is extended in the direction of arrow B1 (see FIG. 1), the back raising drive arm 200 is centered on the pivotal support 200r via the drive arm 213. It turns in the back raising direction (arrow U1 direction). At this time, the first back-up driven arm 300 follows and pivots in the back-up direction (arrow U10 direction) around the pivotal support 310r. The second back-up driven arm 400 follows and turns in the back-up direction (arrow U20 direction) around the pivotal support 400r. As a result, the user's back lying on the bed can be lifted.

  According to the present embodiment, as shown in FIG. 3A, when using the lumbar support function, the lumbar support portion 350 has a two-point support structure of the pin 113 and the fixture 380, and the load applied by the user. Even when is acting on the rotating roller 360, the lumbar support portion 350 is prevented from idling. In particular, since the load application direction (the direction opposite to the direction of the arrow A1) and the direction in which the long groove 390 extends are substantially orthogonal, the idling of the lumbar support portion 350 is effectively prevented. Further, as shown in FIG. 3C, the lumbar support portion 350 is also a two-point support structure of the pin 113 and the fixture 380 even in the release position, and the lumbar support portion 350 is prevented from idling.

  4A to 4I, when the back bottom 102 (bottoms 103 and 109) is raised, the back raising drive arm 200, the first back raising driven arm 300, and the second back raising driven arm 400 are shown. The turning process is shown. 4A to 4I do not execute the lumbar support function. As shown in FIGS. 4A to 4I, the back bottom 102 is gradually raised from an angle of 0 °. For example, the back is raised to an angle of 75 °. The maximum back-up angle is not limited to 75 °, and can be changed as appropriate according to the type of bed. According to the present embodiment, the lumbar support bottom 103 on the waist side of the back bottom 102 is operated by the operation of the first back raising driven arm 300 and the second back raising driven arm 400 at the time of raising the back as in the conventional case. Displacement is made in the rear of the user (in the direction of arrow RA shown in FIG. 4I).

  As described above, according to the present embodiment, the lumbar support portion 350 is switched from the lumbar support position to the release position depending on the physical condition of the user. Thus, when the lumbar support part 350 is switched from the lumbar support position to the release position, the lumbar support part 350 is attached to the back raising mechanism 20A. The possibility of losing 350 can be eliminated.

  According to this embodiment, the attachment 380 attaches the lumbar support part 350 to the main body arm 310 or the bottom frame 110 at the lumbar support position, and attaches the lumbar support part 350 to the main body arm 310 or the bottom frame 110 at the release position. Thus, the fixture 380 is shared in both the lumbar support position and the release position. For this reason, in the release position where the lumbar support function is not used, the risk of the fixture 380 being lost is eliminated. Thus, according to the present embodiment, the lumbar support portion 350 is attached to the back raising mechanism 20A in both the lumbar support position and the release position. In this case, since the lumbar support portion 350 is attached to the back raising mechanism 20A even in the release position where the lumbar support portion 350 is not used, there is a risk that the lumbar support portion 350 may be lost when the lumbar support portion 350 is not used. Can be resolved.

  According to the present embodiment, the bottom 104 is fixed to the bottom frame 110 as can be understood from FIG. When the lumbar support function is performed, the lumbar support bottom 103 floats from the bottom frame 110, but the bottoms 104 and 109 do not float from the bottom frame 110. This is because if the lumbar support bottom 103 and the bottom 104 are integrally formed at the lumbar support position and float from the bottom frame 110, the flying height may become excessive.

  Now, according to this embodiment, the following characteristic structure is adopted. FIG. 5 shows an initial start immediately after the back raising drive arm 200 starts the back raising operation. As shown in FIG. 5, the bottom frame 110 is slightly inclined at an angle θ1 (for example, an arbitrary value in the range of 2 to 15 °) with respect to the virtual horizontal line HA (corresponding to the upper surface of the upper frame 101 of the bed). The rail portion 60 is integrally connected to a portion 103k of the lumbar support bottom 103 that faces the fixed bottom 104. The rail part 60 is made of metal, ceramics, hard resin, etc., and has a first rail part 61 and a second rail part 62, both intersecting via an intersection part 63, V-shaped. The first rail portion 61 is pressed by the rotating roller 360. The second rail portion 62 reinforces the first rail portion 61. The rail portion 60 is attached to the lumbar support bottom 103 by attachment means such as welding, fittings (for example, bolts, rivets), and fitting. As a result, the portion 103k of the lumbar support bottom 103 that faces the space 108 is located. It is fixed integrally to the side.

  The load on the upper body of the user at the time of raising the back is supported by the back raising drive arm 200 driven by the back raising drive source 210. On the other hand, although the rail portion 60 is pressed by the rotating roller 360 at the time of raising the back, a load for causing the lumbar support bottom 103 to float and warp the waist of the user acts mainly. A large load does not act on the rail portion 60.

  As shown in FIG. 5, the guide surface 61 a of the first rail portion 61 of the rail portion 60 is rotated by the lumbar support portion 350 at the beginning of the start immediately after the back raising operation of the back raising drive arm 200 is started. The roller 360 (contactor, rolling element) is in contact with the roller surface 362 while facing the roller surface 362. According to the present embodiment as described above, as can be understood from FIG. 5, at the beginning of the back raising operation of the back raising drive arm 200, the first back raising driven arm 300 turns in the back raising direction (arrow U 10 direction). Accordingly, the lumbar support portion 350 has a first back so that the rotatable roller 360 (contactor) of the lumbar support portion 350 can preferentially contact the draft surface 61a of the first rail portion 61 of the rail portion 60. It is provided at the tip of the raised follower arm 300.

  That is, when the first arm 351 of the support member 353 of the lumbar support portion 350 comes into contact with the corner portion 103x of the lumbar support bottom 103 during the back raising operation of the back raising drive arm 200, abnormal noise is generated or the corner portion 103x. May wear excessively. In this regard, according to the present embodiment, as can be understood from FIG. 5, the roller surface 362 of the rotating roller 360 of the lumbar support portion 350 is in the initial stage immediately after the back raising follower arm 300 starts the back raising operation. The rail part 60 which approaches or contacts while facing is provided. As shown in FIG. 5, the rail portion 60 extends toward the back surface 103 r of the lumbar support bottom 103. Therefore, when the back-up driven arm 300 performs a back-up operation in the back-up direction (the direction of the arrow U10), the portion 351x of the first arm 351 of the support member 353 of the lumbar support portion 350 is the corner portion 103x of the lumbar support bottom 103. It is suppressed that it contacts. As a result, generation | occurrence | production of the abnormal noise resulting from the said contact is suppressed. As a result, the first arm 351 of the support member 353 is suppressed from rubbing against the corner 103x of the lumbar support bottom 103. For this reason, wear, damage, etc. of the lumbar support bottom 103 are avoided. Similarly, wear and damage of the support member 353 of the lumbar support portion 350 can be avoided.

  Further, according to the present embodiment, as shown in FIG. 5, during the back raising operation of the back raising follower arm 300, the first arm 351 of the support member 353 of the lumbar support portion 350 is connected to the corner 103 x of the lumbar support bottom 103. The lumbar support part 350 has a first contact with the first rail part 61 of the rail part 60 so that the roller surface 362 of the idling rotatable roller 360 (contactor) of the lumbar support part 350 comes into contact with the first rail part 61 preferentially. It is provided on the side of the front end portion of the one-side raised follower arm 300. As a result, when the back-up driven arm 300 performs the back-up operation, an abnormal noise is generated when the first arm 351 of the support member 353 of the lumbar support portion 350 contacts the corner portion 103x of the lumbar support bottom 103. It is suppressed. As a result, while the idling rotation roller 360 rolls, the guide surface 61a of the first rail portion 61 of the rail portion 60 reaches the corner portion 103x of the lumbar support bottom 103, and the corner portion 103x is in the direction of arrow X1 (see FIG. 5). ) And smoothly move to the back surface 103r of the bottom 103. For this reason, wear, damage, etc. of the lumbar support bottom 103 are avoided. Similarly, wear and damage of the support member 353 of the lumbar support portion 350 can be avoided.

  According to the present embodiment, the lumbar support unit 350 can be switched between the lumbar support position and the release position. However, the present invention is not limited to this, and the lumbar support member 350 may always be set at the lumbar support position and cannot be switched to the release position.

(Embodiment 2)
6 to 9 show Embodiment 2 of the present invention. This embodiment basically has the same configuration and the same function and effect as the first embodiment. FIG. 6 shows a state where the back raising operation of the back raising drive arm 200 is not executed. FIG. 7 shows an enlarged main part of FIG. FIG. 8 shows an initial state immediately after the back raising drive arm 200 starts a back raising operation in the back raising direction (arrow U1 direction). FIG. 9 shows an enlarged main part of FIG.

  According to the present embodiment, the following characteristic structure is employed as in the first embodiment. As shown in FIGS. 6 and 7, as in the first embodiment, a space 108 is formed between the lumbar support bottom 103 and the fixed bottom 104. The rail portion 60 is integrally connected to a portion 103k of the lumbar support bottom 103 on the fixed bottom 104 side. As shown in FIG. 7, the rail portion 60 is located in the space 108 and is formed of a first rail portion 61 and a second rail portion 62 that form a hollow portion 65, and has a V shape in cross section. Eggplant. The weight of the rail portion 60 can be reduced by the hollow portion 65. The rail portion 60 is disposed at a portion 103k of the lumbar support bottom 103 and is attached by welding, a fixture or the like, and is positioned so as to face the space 108.

  Before the back raising drive arm 200 starts the back raising operation in the direction of the back raising (arrow U1), as shown in FIG. 6, the rotating roller 360 is retracted from the back surface 109r of the fixed bottom 109 via the interval ΔE1. ing. Further, as shown in FIG. 7, which is an enlarged view of the main part of FIG. 6, before starting the back raising operation, the roller surface 362 of the rotating roller 360 faces the space 108 from the upper surface 110u of the bottom frame 110. Projects upward. Accordingly, the roller surface portion 362 r on one side from the uppermost portion 362 u of the roller surface 362 of the rotating roller 360 is inclined so as to descend toward the lumbar support bottom 103. In order to cope with such an inclination of the roller surface portion 362r, in FIG. 7 (showing the state before the back raising operation), the first rail portion 61 of the rail portion 60 passes through the space 108 from the lumbar support bottom portion 103. Thus, it is inclined so as to gradually rise toward the fixed bottom 104. For this reason, when the back-up driven arm turns in the back-up direction (arrow U10 direction), the rotating roller 360 can effectively press the first rail portion 61.

  FIG. 7 shows a state where the back raising operation of the back raising drive arm 200 is not executed by the back raising drive source 210 (state before the back raising operation) as described above. According to this state, as shown in FIG. 7, the rotating roller 360 (contactor) of the lumbar support part 350 is positioned so as to face the space 108, and ΔK <b> 1 from the upper surface 110 u of the bottom frame 110 to the space 108. Probably protruding upwards. The reason for projecting by ΔK1 before the back raising operation is that when the back raising of the apparatus is completed, the lumbar support bottom 103 is projected in an arrow A1 direction (see FIG. 3A, the lumbar support direction) by an appropriate amount. This is because the user's waist (pelvis) at the time of raising the user's back is warped and urged toward the user's abdomen, thereby reducing the feeling of pressure on the user's abdomen. As described above, according to the present embodiment, before the back raising operation, as shown in FIG. 7, the rotation roller 360 protrudes upward from the upper surface 110 u of the bottom frame 110 into the ΔK1 space 108 and the lumbar support portion 350 rotates. The roller 360 (contactor) approaches the first rail portion 61 while facing the first rail portion 61 while forming a gap ΔW1 with the first rail portion 61 of the rail portion 60. Since such a gap ΔW1 is provided, the rotation roller 360 presses the rail portion 60 at a time delayed by Δt (ΔW1 movement time) with respect to the back raising start time, and as a result, the lumbar support The bottom 103 is displaced in the lumbar support direction (arrow A1 direction).

  8 and 9 show an initial stage immediately after the back raising drive source 210 starts driving and the back raising operation of the back raising drive arm 200 slightly proceeds as described above. In the initial stage, as can be understood from FIG. 9, the roller surface 362 of the rotatable roller 360 (contactor) of the lumbar support portion 350 that preferentially contacts the guide surface 61 a of the first rail portion 61 of the rail portion 60. It is set to be.

  That is, as can be understood from FIG. 9, the portion 351 x of the first arm 351 that does not have the rolling property of the lumbar support portion 350 at the initial stage of the back raising operation of the back raising drive arm 200 is the corner of the lumbar support bottom 103. When contacting the portion 103x, there is a risk that abnormal noise may be generated due to rubbing or the like. In this regard, according to the present embodiment, as shown in FIG. 9, the portion 351x of the first arm 351 of the support member 353 of the lumbar support portion 350 at the initial stage immediately after the start of the back raising operation of the back raising drive arm 200 is the lumbar. The roller surface 362 of the idling rotatable roller 360 (contactor, rolling element) having rolling properties in the lumbar support portion 350 is more in contact with the corner portion 103x of the support bottom 103 than the first rail of the rail portion 60. Preferentially contacts the guide surface 61a of the part 61.

  Therefore, according to the present embodiment, the first arm 351 of the support member 353 of the lumbar support portion 350 is in the corner 103x of the lumbar support bottom 103 at the initial start immediately after the back raising operation of the back raising drive arm 200 is started. Occurrence of abnormal noise that occurs when touching is effectively suppressed. That is, the first arm 351 of the support member 353 is suppressed from rubbing against the corner 103x of the lumbar support bottom 103. As a result, wear, damage and the like of the lumbar support bottom 103 are avoided. Similarly, wear and damage of the support member 353 of the lumbar support portion 350 can be avoided.

  Further, as can be understood from FIG. 5, the rotation roller surface 362 of the rotation roller 360 (contactor) capable of idling of the support member 353 of the lumbar support portion 350 at the initial stage immediately after the start of the back raising operation of the back raising drive arm 200 is the rail. As the back raising operation of the back raising drive arm 200 further proceeds, the roller surface 362 of the rotating roller 360 moves the corner 103x of the lumbar support bottom 103 as the back raising operation arm 200 further advances. The lumbar support operation can be smoothly performed because the vehicle can smoothly move in the direction of the arrow X1 (see FIG. 9) and slide along the back surface 103r of the lumbar support bottom 103.

  In the present embodiment, the lumbar support portion 350 may be configured to be switchable between a lumbar support position and a release position, or the lumbar support member 350 is always set at the lumbar support position. Therefore, the structure may not be switched to the release position.

(Embodiment 3)
FIG. 10 shows a third embodiment. This embodiment has basically the same configuration and the same operation and effect as the first and second embodiments. Hereinafter, the description will focus on the different parts. FIG. 10 shows a state before the back raising operation is started. As shown in FIG. 10, the rail portion 60 </ b> B is fixed to the lumbar support bottom 103 while being reinforced by ribs 650. Before starting the back raising operation, the rail portion 60B is already in contact with the roller surface 362 of the rotating roller 360. In this case, almost simultaneously with the start of the back raising operation of the back raising drive source 210, the rotating roller 360 can immediately move the rail portion 60B and thus the lumbar support bottom 13 in the arrow A1 direction (lumbar support direction). Therefore, the lumbar support effect is manifested with the start of raising the back. Note that in this embodiment as well, the lumbar support portion 350 may be configured to be switchable between the lumbar support position and the release position, or The lumbar support member 350 is always set at the lumbar support position and may not be switched to the release position.

( Reference example )
FIG. 11 shows a reference example . This reference example has basically the same configuration and the same operation and effect as the above-described embodiment. Hereinafter, the description will focus on the different parts. FIG. 11 shows a state where the back lifting operation is completed. As shown in FIG. 11, the back-up driven arm 300 includes a main body arm 310 and a lumbar support portion 350 </ b> C provided on the distal end side of the main body arm 310. The lumbar support portion 350 </ b> C is provided with a rotatable roller 360 having a roller surface 362 via a rotation shaft 365. The rotating roller 360 has a structure that cannot be easily detached from the main body arm 310. At the time of raising the back, as shown in FIG. 11, the back-up follower arm 300 turns, and the rotating roller 360 (contactor) that functions as a rolling element of the lumbar support portion 350C warps the user's waist toward the ventral side. Next, the lumbar support bottom 103 is operated with respect to the bottom frame 110 in the arrow A1 direction (lumbar support direction).

(Embodiment 4 )
12 and 13 show a fourth embodiment. The present embodiment has basically the same configuration and the same operational effects as the above-described embodiments. Hereinafter, the description will focus on the different parts. As shown in FIGS. 12 and 13, the rail portion 60 has a distance adjustment mechanism 70 that adjusts the distance between the roller surface 362 of the rotating roller 360 of the lumbar support portion 350 and the first rail portion 61. That is, one end 61e of the first rail portion 61 is pivotally supported by the support plate 103d of the lumbar support bottom 103 so as to be pivotable via the pivot 63. The engaging member 65 provided at the one end portion 62e of the second rail portion 62 has an engaging claw 66 made of resin or metal. The engaging claw 66 is detachable by engaging and disengaging the first locking hole 70f (first position) and the second locking hole 70s (first position) of the lumbar support bottom 103, respectively. Yes. The other end portion 61 f of the first rail portion 61 and the other end portion 62 f of the second rail portion 62 are connected to each other by a pivotal support 67 so as to be able to turn.

  FIG. 12 shows a case where the engaging claw 66 of the engaging member 65 of the second rail portion 62 is inserted and engaged with the first locking hole 70 f of the lumbar support bottom 103. In this case, as shown in FIG. 12, the crossing angle θa between the first rail portion 61 and the second rail portion 62 is relatively small before the back raising operation. As a result, as shown in FIG. 12, the first rail portion 61 contacts the cylindrical roller surface 362 of the rotating roller 360. In this case, when the back raising operation is started, the guide surface 61 a of the first rail portion 61 is already in contact with the roller surface 362 of the rotating roller 360. For this reason, simultaneously with the start of the back raising operation, the rotating roller 360 can immediately press the first rail portion 61 of the rail portion 60 in the direction of arrow A10 (see FIG. 12, lumbar support direction), and as a result, the lumbar support bottom 103 is pressed by the arrow A1. It can be immediately pressed in the direction (see FIG. 12, lumbar support direction).

  On the other hand, FIG. 13 shows a case where the engaging member 65 of the second rail portion 62 is inserted into the second locking hole 70s of the lumbar support bottom 103 and engaged therewith. In this case, as shown in FIG. 13, the crossing angle θa between the first rail portion 61 and the second rail portion 62 is relatively large before the back raising operation. As a result, the first rail portion 61 is separated from the roller surface 362 of the rotating roller 360 by ΔW10. In this case, when the back raising operation of the back raising mechanism 20 </ b> A is started, the roller surface 362 of the rotating roller 360 is not in contact with the guide surface 61 a of the first rail portion 61. For this reason, at the start of raising the back, the timing when the roller surface 362 of the rotating roller 360 lifts the rail portion 60 in the arrow A10 direction (lumbar support direction) is slightly delayed by ΔW10. The timing for starting lifting the lumbar support bottom 103 in the direction of arrow A1 (the lumbar support direction) is slightly delayed by ΔW10. As described above, according to the user's preference or the like, the engagement member 65 is made to be the first engagement hole 70f (first engagement portion) or the second engagement hole 70s (first engagement portion) of the lumbar support bottom 103. By switching to, the roller surface 362 of the rotating roller 360 can adjust the timing for lifting the lumbar support bottom 103 in the direction of arrow A1 (the lumbar support direction in which the waist is bent to reduce the pressure on the abdomen).

  Also in this embodiment, the lumbar support portion 350 may be configured to be switchable between the lumbar support position and the release position, or the lumbar support member 350 is always set at the lumbar support position. It may be a structure that cannot be switched to the release position.

(Other)
According to the first embodiment described above, the rail portion 60 is provided in the portion 103k facing the space 108 in the lumbar support bottom 103. However, the present invention is not limited to this. Other parts may be used. The rail portion 60 has a V shape in cross section, but is not limited thereto, and may be a W shape or a right triangle shape in which the second rail portion 62 is oriented in the horizontal direction. In switching from the lumbar support position to the release position, the turning angle of the lumbar support portion 350 is about 180 °, but is not limited to this, and the structure is about 90 °, about 120 °, and about 270 °. It is also good. Although the support member 353 of the lumbar support part 350 has a dogleg shape, the present invention is not limited to this.

  As a contact that presses the lumbar support bottom 103, a rotatable cylindrical rotating roller 360 is employed, but the present invention is not limited thereto, and a spherical rotating roller may be used. The sliding roller 360 is not limited to the rotating roller 360, and a sliding body or a sliding body having a low solid coefficient of friction that slides smoothly while contacting the back surface 103r of the lumbar support bottom 103 and the rail portion 60 may be used. As a sliding body or a slide body, you may form using the fluororesin etc. which are rich in solid lubricity.

  The lumbar support portion 350 can be switched between the lumbar support position and the release position capital. However, the present invention is not limited to this, and the lumbar support member 350 may have a structure that is always set at the lumbar support position. In some cases, the fixed bottom 104 may be abolished. The base 100 constituting the bed may be a type in which the height position of the upper frame 101 is fixed, or a type in which the height position of the upper frame 101 can be raised and lowered. The present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope not departing from the gist.

The following technical idea can also be grasped from the description of this specification.
[Additional Item 1] A base that constitutes the bed, a back bottom that is provided on the base and supports a user's back lying on the bed, and a lumbar support bottom that faces at least the user's waist on the back bottom. A supporting bottom frame; and a back raising mechanism that raises the back bottom together with the bottom frame so that the user's back is lifted with respect to the user's lower body. A back-up drive arm that is pivotally supported and has a tip that lifts the back bottom relative to the user's lower body, and a back-up drive for turning the back-up drive arm in the back-up and back-down directions And a base end portion pivotally supported by the base body so as to pivot in the back-up direction and the back-down direction following the turning of the back-up drive arm. The back-up follower arm operates the lumbar support bottom with respect to the bottom frame so as to warp the user's waist toward the ventral side, and the back-up lift arm. A bed back raising device having a lumbar support portion having a contactor slidable along the lumbar support bottom together with a back raising operation of the mechanism. In this case, the lumbar support bottom can be moved by the lumbar support portion, and the user's waist can be bent toward the ventral side.

  100 is a base, 101 is an upper frame, 102 is a back bottom, 103 is a lumbar support bottom, 104 is a fixed bottom, 110 is a bottom frame, 20A is a back raising mechanism, 200 is a back raising drive arm, and 210 is a back raising drive source , 211 is a body, 212 is a rod, 213 is a drive arm, 300 is a first back-up driven arm, 310 is a body arm, 350 is a lumbar support part, 351 is a first arm, 352 is a second arm, and 353 is a support member. 360 is a rotating roller (contact), 362 is a roller surface, 380 is a fixture, 390 is a long hole, 400 is a second back-up driven arm, 60 is a rail portion, 61 is a first rail portion, and 61a is a guide surface. , 62 is a second rail portion, 65 is an engaging member, and 70 is a distance variable mechanism.

Claims (3)

A base that constitutes a bed, a back bottom that is provided on the base and supports a user's back lying on the bed, and a bottom frame that supports a lumbar support bottom that faces at least the user's waist side of the back bottom; A back raising mechanism that lifts the back bottom together with the bottom frame so as to lift the user's back against the user's lower body;
The back raising mechanism includes a back raising drive arm that has a base end pivotally supported on the base body and a tip that raises the back bottom relative to the lower body of the user, and the back raising drive arm. A back-up drive source for turning in the direction and the back-down direction, and a base end portion pivotally supported by the base body so as to turn in the back-up direction and the back-down direction following the turning of the back-up drive arm And a back-up follower arm for
The back-up follower arm operates the lumbar support bottom with respect to the bottom frame so that the user's waist is bent toward the ventral side, and the lumbar support is used together with the back-up operation of the back-up mechanism. It has a lumbar support part with contacts that can slide along the bottom,
The lumbar support bottom is a rail that extends toward the lumbar support bottom while the back drive arm approaches or contacts the contactor of the lumbar support portion in the initial stage of the back up operation. Department have a,
The lumbar support portion includes a support member having a first arm and a second arm that intersect with each other, and the contact provided so as to be idled in any one of the first arm and the second arm. And
In the back raising operation of the back raising drive arm, the idler contact of the lumbar support part has priority over the rail part rather than the support member of the lumbar support part coming into contact with the bottom for the lumbar support. in contact, wherein the lumbar support portion bed back lifting device that provided in the back lifting follower arm. A base that constitutes a bed, a back bottom that is provided on the base and supports a user's back lying on the bed, and a bottom frame that supports a lumbar support bottom that faces at least the user's waist side of the back bottom; A back raising mechanism that lifts the back bottom together with the bottom frame so as to lift the user's back against the user's lower body;
The back raising mechanism includes a back raising drive arm that has a base end pivotally supported on the base body and a tip that raises the back bottom relative to the lower body of the user, and the back raising drive arm. A back-up drive source for turning in the direction and the back-down direction, and a base end portion pivotally supported by the base body so as to turn in the back-up direction and the back-down direction following the turning of the back-up drive arm And a back-up follower arm for
The back-up follower arm operates the lumbar support bottom with respect to the bottom frame so that the user's waist is bent toward the ventral side, and the lumbar support is used together with the back-up operation of the back-up mechanism. It has a lumbar support part with contacts that can slide along the bottom,
The lumbar support bottom is a rail that extends toward the lumbar support bottom while the back drive arm approaches or contacts the contactor of the lumbar support portion in the initial stage of the back up operation. Part
The lumbar support portion releases the lumbar support position without bringing the contactor into contact with the lumbar support bottom, and the lumbar support position with which the contactor is brought into contact with at least the lumbar support bottom of the back bottom. A bed back raising device that can be switched to a release position . A base that constitutes a bed, a back bottom that is provided on the base and supports a user's back lying on the bed, and a bottom frame that supports a lumbar support bottom that faces at least the user's waist side of the back bottom; A back raising mechanism that lifts the back bottom together with the bottom frame so as to lift the user's back against the user's lower body;
The back raising mechanism includes a back raising drive arm that has a base end pivotally supported on the base body and a tip that raises the back bottom relative to the lower body of the user, and the back raising drive arm. A back-up drive source for turning in the direction and the back-down direction, and a base end portion pivotally supported by the base body so as to turn in the back-up direction and the back-down direction following the turning of the back-up drive arm And a back-up follower arm for
The back-up follower arm operates the lumbar support bottom with respect to the bottom frame so that the user's waist is bent toward the ventral side, and the lumbar support is used together with the back-up operation of the back-up mechanism. It has a lumbar support part with contacts that can slide along the bottom,
The lumbar support bottom is a rail that extends toward the lumbar support bottom while the back drive arm approaches or contacts the contactor of the lumbar support portion in the initial stage of the back up operation. Part
A distance adjustment mechanism that adjusts the distance between the contact of the lumbar support part and the rail part before starting the back raising operation of the back raising drive arm is provided on at least one of the rail part and the bottom for the lumbar support. provided it is in that bed back-up system.

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