TW202019365A - Bed apparatus - Google Patents

Abstract

This bed apparatus includes a bed frame, a floor plate body, a back-raising mechanism, an operating shaft, an attachment member, a transmission member, and a pressing member. The floor plate body includes a fixed floor part and a back floor part which has a center back part and a pair of side back parts that are connected to both sides of the center back part so as to rotate forward, and which is rotatable relative to the fixed floor part. The back-raising mechanism raises and lowers the back floor part. The operating shaft is rotatably supported by a back surface of the center back part. The attachment member is provided on an intermediate part of the operating shaft. The transmission member has one end fixed to the attachment member and another end fixed to a portion where tensile force is generated when the back floor part is driven in a rising direction, and causes the operating shaft to rotate by this tensile force. The pressing member is provided on both ends of the operating shaft such that the angle thereof can be changed, and is positioned in either an operating position at which the pair of side back parts are caused to rotate forward when the operating shaft is rotated by the transmission member or a non-operating position at which the pair of side back parts are not caused to rotate forward.

Description

Bed device

Field of invention The invention relates to a back-up bed device suitable for users with physical inconvenience.

Background of the invention For example, for a bed device used by a user with physical inconvenience, a back-up bed device is known. In the back-up type bed device, the bed plate body provided in the bed frame is divided into a plurality of parts such as a back bed part, a waist bed part, and a foot bed part, and the bed parts are rotatably connected. The back bed portion is provided at a position corresponding to the upper body of the user, and can be driven to be raised and lowered by a back lifting mechanism.

In the above-mentioned back-up type bed device, if a user with poor physical strength, etc., wants to stand up the back bed portion and raise his upper body, this posture cannot be maintained, and it may fall sideways. Therefore, as shown in Patent Document 1, a bed device that can prevent a user whose upper body has stood up from falling sideways is proposed.

In the bed apparatus shown in Patent Document 1, the back bed portion is composed of a center back and a pair of side backs rotatably connected to both sides of the center back. The back bed portion is made of foamed resin, and a pair of protrusions each having an inclined surface are integrally formed on the back surfaces of the pair of side back portions. An inclined portion is formed at an end portion where the protruding strip portion becomes an upper end when lifting the back.

On the other hand, in addition to the back-up roller, the back-up arm that raises and lowers the back-up bed portion is also provided with a push-up roller. The push-up roller is intended to drive the back-lifting arm to rotate in the upward direction to make the back-up bed portion stand up, and to rotate from the inclined surface on the protrusion on the back of the side back. With this, the side back is pushed toward the front side of the central back in accordance with the height of the protrusion.

At this time, after the pair of side backs are rotated forward with one side of the width direction connected to the central back as a fulcrum, the pair of side backs that have been rotated are used to prevent the user’s upper body from standing up. The head fell sideways. Advanced technical literature

[Patent Literature] [Patent Document 1] Japanese Patent No. 3910873

Summary of the invention Problems to be solved by invention According to the above-mentioned conventional structure, in order to form a mechanism for tilting the side back, it is necessary to provide a push-up roller on the back-lifting arm and a protrusion on the side back.

That is, it is necessary to provide a push-up roller that constitutes a mechanism for inclining the side back on the back raising arm that constitutes the back lifting mechanism that raises and lowers the back bed portion relative to the waist bed portion, and a protrusion is provided on the back of the side back unit. Moreover, the back-up arm, the push-up roller, and the protruding portion must be positioned in relation to each other.

Therefore, since the relative assembly accuracy or manufacturing accuracy of the back raising mechanism and the mechanism for tilting the side backs is required, its manufacturing or assembly operations are time-consuming.

The present invention is to provide a bed device which can rotate the side backs provided on both sides of the central back of the back bed part by a mechanism separate from the back lift mechanism when the back is lifted. Means to solve the problem

The bed device according to one aspect of the present invention includes: Bed frame The bed plate body includes: a fixed bed portion fixed to the bed frame; and a back bed portion having a central back portion and a pair of side back portions, and provided to be rotatable relative to the fixed bed portion, the pair of side back portions It is connected to the central back and both sides of the central back in a rotating direction; Lifting the back mechanism to raise and lower the back bed portion of the bed plate body; Actuating shaft, the axis is rotatably supported by the back of the central back along the width of the central back; The mounting member is arranged in the middle of the actuating shaft; One end of the transmission member is fixed to the mounting member, and the other end is fixed to the part that actuates the back-lifting mechanism to drive the back-bed portion in the erecting direction and generates tension, and the tension causes the aforementioned The actuation shaft rotates in a predetermined direction; and The pressing member is provided at both ends of the actuating shaft, can change the angle with respect to the circumferential direction of the actuating shaft, and is driven in the standing direction at the back bed portion, and the actuating shaft is rotated by the transmission member When moving, the pair of side backs are positioned at either an actuating position that rotates forward or a non-actuating position that does not rotate forward.

Detailed description of the preferred embodiment

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 10.

1 and 2 are perspective views of the bed device of this embodiment. This bed apparatus includes the bottom frame 1 shown in FIG. 2. The bottom frame 1 is formed in a rectangular shape, and installation legs 2 are provided at four corners thereof. Furthermore, a caster can be provided instead of the foot 2 for installation.

As shown in FIG. 2, one end of the connecting rod 4 (only three places shown in the figure) constituting the up-and-down driving mechanism 3 is pivotally connected to the upper surface of the four corners of the bottom frame 1, and the other end is pivotally connected to a rectangle formed as described below Four corners of the frame-shaped bed frame 5.

The four connecting rods 4 are driven to be linked to each other by a driving source 6 for up and down via an interlocking link (not shown). That is, the connecting rod 4 is pivotally connected to one end of the bottom frame 1 as a fulcrum, and is flattened to a horizontal state, and is driven in the rising direction shown in FIG. 2.

Thereby, the bed frame 5 can be deformed from the lowered position shown in FIG. 1 to the raised position shown in FIG. 2.

As shown in FIG. 3, the bed frame 5 has a body frame portion 11 formed in a rectangular frame shape. An adjustment frame 12 is held at one end and the other end of the main body frame portion 11 in the longitudinal direction.

The pair of adjustment frames 12 provided on one end side and the other end side of the main body frame portion 11 in the longitudinal direction can move along the long side direction of the main body frame portion 11 as shown by the arrow X, and can be moved The stop assembly shown is fixed at a predetermined moving position.

In other words, the overall length of the bed frame 5 can be adjusted according to the height of the user, etc. by adjusting the mounting position of the frame 12 on the body frame portion 11.

On both sides of the pair of adjustment frames 12, a pair of support members 14 are provided, respectively. One end of the arm member 15 is rotatably connected to both ends of each support member 14, and the other end of the arm member 15 is pivotally connected to the adjustment frame 12.

Thereby, the support member 14 can move between a position close to the side of the adjustment frame 12 as shown by the solid line in FIG. 3 and a position away from the side of the adjustment frame 12 as shown by the chain line.

Support holes 16 are formed at both ends of the upper surface of the support member 14 in the longitudinal direction, respectively. When the support member 14 is moved to the position indicated by the chain line, a pair of legs of the side grille (not shown) are inserted into the support hole 16.

As shown in FIGS. 1 and 2, a plate body 17 composed of a head plate and a foot plate is connected to the lower end portion and is provided on the short side portion of the adjustment frame 12 in a standing state.

On both sides of the body frame portion 11, a decoration member 18 is provided at a portion between the pair of support members 14. The decoration member 18 is arranged such that when the support member 14 is positioned close to the side of the adjustment frame 12, the side surface will be almost in line with the side surface of the adjustment frame 12.

Thereby, when the support member 14 is not used, the support member 14 and the decoration member 18 are integrated, and the drop on the side of the bed frame 5 can be prevented, so that a good appearance can be exhibited.

As shown in FIGS. 1 and 2, a bed plate body 25 is provided on the upper surface of the bed frame 5. The bed plate body 25 has a pair of fixed bed portions 26 divided into two and attached to the middle portion of the main body frame portion 11 in the longitudinal direction.

The first waist bed portion 27 and the second waist bed portion 28 are rotatably connected to one of the fixed bed portions 26 in sequence. The connecting portion 29 protrudes from one side of the second waist bed portion 28, and the back bed portion 31 is connected to the connecting portion 29.

As shown in FIG. 1, the back bed portion 31 has a central back 32 that is rotatably connected to the connecting portion 29 at its lower end, and a pair of side backs 33 connected to both sides of the central back 32. The central back 32 is pivotable toward the front (front) as a fulcrum, and the lateral back 33 is pivotable toward the front with one side connected to the central back 32 as a fulcrum.

The pair of first foot bed portions 35 and the second foot bed portions 36 are sequentially connected to the other fixed bed portion 26 in a rotatable manner.

The first waist bed portion 27 and the second waist bed portion 28 of the bed board body 25, and the first foot bed portion 35 and the second foot bed portion 36 are composed of two overlapping members, and each of them is provided as Move relative to another member. Moreover, when one of the movable members is moved relative to the other member, one of the members can be fixed at a predetermined moving position relative to the other member.

Thereby, when the adjustment frame 12 is moved relative to the body frame portion 11 to change the length of the bed frame 5, the bed plate body 25 can be set to correspond to the length of the bed frame 5.

The bed frame 5 is provided with a back raising mechanism 37 shown in FIG. 4. The bed board body 25 can be flattened from the state shown in FIG. 2 to the first waist bed portion 27, the second waist bed portion 28, the back bed portion 31, and the first foot shown in FIG. The direction in which the bed portion 35 and the second foot bed portion 36 are raised is driven.

The back-up mechanism 37 has a drive unit 38 with a built-in drive source (not shown). The axis of the first drive shaft 41 and the second drive shaft 42 are provided parallel to the drive portion 38. The drive shafts 41 and 42 are rotated by a drive source (not shown).

Both end portions of the first drive shaft 41 and the second drive shaft 42 are rotatably supported by the inner surfaces of both sides of the body frame portion 11 of the bed frame 5.

A link 43 is provided at each end of the first drive shaft 41 and the second drive shaft 42 in the axial direction. One end of the connecting arm 44 and the other end are rotatably connected to the pair of links 43. Thereby, when the first drive shaft 41 is rotationally driven, the second drive shaft 42 is linked to the rotation through the connecting arm 44.

A pair of back raising arms 45 are connected to the base end and provided at both ends of the first drive shaft 41. A pair of back-up rollers 46 are rotatably provided at the front end portions of the pair of back-up arms 45 at predetermined intervals.

One end of the attachment link 47 is connected to both ends of the second drive shaft 42. The base end of the foot link 49 is pivotally connected to the other end of the mounting link 47, and the front end of the foot link 49 is provided with a rotatable foot lift roller 48.

One end of the link 51 is pivotally connected to the base end of the foot link 49, and the other end of the link 51 is pivotally connected to the end of the second drive shaft 42. When the second drive shaft 42 rotates in conjunction with the first drive shaft 41, the foot lift roller 48 is linked to its rotation, and the linkage link 51, the foot link 49, and the mounting link 47 are linked to each other, and are provided on the foot link The foot lifting roller 48 at the front end of 49 is driven upward from the lower position.

As a result, the back-up mechanism 37 drives the bed plate body 25 lying flat in the horizontal state as shown in FIG. 2, and erects the first and second waist bed portions 27 and 28 and the back bed portion 31 as shown in FIG. 1. Furthermore, the back raising mechanism 37 flexes the first foot bed portion 35 and raises the second foot bed portion 36.

FIG. 5 shows the back surface of the back bed portion 31 of the bed plate body 25 (the lower surface when the back bed portion 31 is flattened horizontally as shown in FIG. 2 ). A pair of back raising rails 53 are fixed to the back of the second waist bed portion 28, and the pair of back raising rails 53 are spaced apart in the width direction of the second waist bed portion 28 at predetermined intervals.

The back-raising rail 53 is formed by a member having three plate-shaped sections and flexed in cross-section, and has a length spanning from the first waist bed portion 27 to the back surface of the central back 32 of the back bed portion 31.

The back-up roller 46 shown in FIG. 4 is rotatably engaged with the back-up rail 53. With this, the back-up arm 45 is driven in the standing direction by the rotation of the first drive shaft 41, and the back-up roller 46 rotates along the back-up rail 53. At this time, the first waist bed portion 27 is linked to the second waist bed portion 28, the back bed portion 31, and the second waist bed portion 28, and is driven to stand upright as shown in FIG. 1 from the state of being flat as shown in FIG. status.

At this time, if the second drive shaft 42 is linked to the first drive shaft 41, the first foot bed portion 35 and the second foot bed portion 36 can be driven in the upward direction. In addition, whether to interlock the second drive shaft 42 with the first drive shaft 41 can be selectively set.

The bed board body 25 is provided with a pair of head-up rails 55 on the inner side in the width direction than the pair of back-up rails 53. One end of these head-up rails 55 is fixed to the lower surface (back surface) of the first waist bed portion 27. These head-up rails 55 are used to make the center back 32 of the back bed portion 31 fall forward with its base end as a fulcrum, as described later.

As shown in FIG. 5, on the back of the central back 32 of the back bed portion 31, a hollow actuating shaft 56 is provided above the front ends of the pair of back-lift rails 53. Both ends of the operating shaft 56 are rotatably held by the holder 57.

The arm portion 58 having a predetermined length as a mounting member is an intermediate portion fixed at one end in the axial direction of the actuating shaft 56. And one end of the cable 59 as a conductive member is fixed to the other end of the arm portion 58. The cable 59 is engaged with the roller 60 and changes direction to approach the back of the central back 32, and the other end extends toward the back of the second waist bed portion 28.

Both ends of the cross member 61 are fixedly erected on one end portion of the pair of back raising rails 53 on the second waist bed portion 28 side. A holder 62 is provided in the middle of the horizontal member 61.

As shown in FIG. 6, the winding shaft 63 to which the pulley 63 a is attached is rotatably supported by the holder 62. At one end of the winding shaft 63, a fastening member 64 such as a nut is provided. With the fastening member 64, the winding shaft 63 can be kept from rotating.

One end of the cable 59 is wound by the pulley 63a of the winding shaft 63. Therefore, the winding length of the cable 59 is adjusted by the pulley 63a, whereby the length of the cable 59 from one end connected to the arm portion 58 to the other end on the winding shaft 63 side can be adjusted.

When the back bed portion 31 flexes the first and second waist bed portions 27 and 28 by the back lifting mechanism 37 and is driven in the rising direction, the linear distance between the connecting end of the cable 59 and the other end becomes smaller and tension is generated.

When tension is generated on the cable 59, the tension is transmitted to the actuating shaft 56 via the arm 58. As a result, the actuating shaft 56 rotates in a direction that the front end side of the arm portion 58 approaches the back surface of the central back 32.

As described above, the other end of the cable 59 is wound around the winding shaft 63 of the holder 62 with an adjustable length. On the other hand, the length of the bed plate body 25 can be adjusted as described above.

Therefore, when the length of the bed plate body 25 is changed in accordance with the height of the user, etc., the winding amount of the other end of the cable 59 on the winding shaft 63 is adjusted in accordance with the length change, and the total length of the cable 59 is changed. Thereby, even if the length of the bed plate body 25 is changed, the back bed portion 31 can be reliably raised with a fixed tension.

Furthermore, in this embodiment, the other end of the cable 59 is fixed to the holder 62 provided on the cross member 61, and the cross member 61 is erected between the pair of back raising rails 53. In other examples, the other end of the cable 59 can also be fixed outside the cross member 61 erected between the back lifting rails 53, that is, it can be fixed to the cable 59 when the back bed portion 31 is driven in the standing direction The portion where tension is generated is, for example, the first or second waist bed portions 27, 28, or the bed portion 26.

At both ends of the actuating shaft 56, there are provided pressing members 66 made of rollers. When the actuating member 66 is rotated by the cable 59 as the actuating shaft 56, it pushes the side back 33 of the back bed 31 Back to the front.

That is, as shown in FIGS. 7( a) and (b ), one end of the support shaft 67 is rotatably inserted into the end of the operating shaft 56. At the other end of the support shaft 67, an installation groove 68 is formed that penetrates in the radial direction and opens toward the front end surface of the support shaft 67. One end portion of the stopper member 69 whose side shape is L-shaped is attached to the attachment groove 68. A gap 71 with a predetermined interval is formed between the other end of the stopper member 69 and the outer peripheral surface of the support shaft 67, and one circumferential end of the peripheral wall of the actuating shaft 56 enters the gap 71.

An attachment shaft 72 is attached to one end of the stop member 69. The axis of the mounting shaft 72 is inclined at a predetermined angle with respect to the axis of the support shaft 67, for example, an angle of 45 degrees. The pressing member 66 is rotatably attached to the front end portion of the mounting shaft 72.

Plate-shaped holding members 73 are provided at both ends of the actuating shaft 56. The holding members 73 are fixed in the middle of the vertical direction along the axial direction of the outer peripheral surface of the support shaft 67. Both ends of the holding member 73 in the vertical direction protrude outward in the radial direction of the actuating shaft 56.

The holding member 73 is provided on one of the side surfaces of the stop member 69, that is, in a state where the actuating shaft 56 is mounted on the back of the central back 32, it will be located on the front side of the stop member 69.

Thereby, by rotating the support shaft 67 with respect to the actuating shaft 56, the stopper member 69 abuts on the lower end or the upper end of the holding member 73 in the height direction, and the mounting shaft 72 is held in either the non-actuated position or the actuated position 5, the non-actuated position is a state where the axis of the mounting shaft 72 is inclined upward with respect to the axis of the actuating shaft 56 as shown in FIG. 5, the actuated position is rotated 180 degrees from the non-actuated position and the axis of the mounting shaft 72 is directed downward Tilted state.

7(b) shows a state where the mounting shaft 72 is held at the actuated position, and the stopper member 69 is engaged with the front side of the lower end 73a of the upper and lower direction of the holding member 73.

When lifting the back, the actuating shaft 56 rotates in the direction indicated by the arrow R in FIG. 7(b) by the tension of the cable 59, and the mounting shaft 72 faces the back of the side back 33 through the holding member 73 and the actuating shaft 56 Side rotation.

When the mounting shaft 72 rotates, the pressing member 66 provided at the front end portion thereof rotates in a direction to press the back surface of the side back 33. Thereby, the side back 33 is driven from the state not inclined to the front side of the center back 32 shown in FIG. 10(a) to the state toward the front side of the center back 32 shown in FIG. 10(b).

As a result, the side back 33 prevents the head of the user whose upper body is supported by the back bed 31 from falling sideways.

The side back 33 is free to rotate toward the front side of the central back 32 with one side as a fulcrum. Therefore, to return the side back 33 that has been pushed forward by the pressing member 66 to the unupright state, first, the side back 33 is rotated forward more than the state where the pressed member 66 is standing move.

Next, the mounting shaft 72 at the actuated position is rotated to a non-actuated position whose axis is inclined upward relative to the axis of the actuated shaft 56, and the stopper member 69 is engaged with and held by the upper end 73b of the holding member 73 at this position Install shaft 72.

Thereby, since the holding state of the side back 33 is released by the pressing member 66, the side back 33 can be returned to the untilted state.

In addition, if the back bed portion 31 is raised with the mounting shaft 72 held in the inactive position, the back bed portion 31 can be raised without tilting the side back portion 33 forward.

That is, according to the above-mentioned configuration, when the back bed portion 31 is lifted up, the stop member 69 is rotated, and the pressing member 66 is positioned at the actuated position or the non-actuated position, whereby the side back can be selected 33Whether it rotates in the standing direction.

Furthermore, the mechanism for driving the pair of side backs 33 in a forwardly inclined direction is referred to as a side lift mechanism 74, and the pair of side backs 33 are provided on both sides of the central back 32 of the back bed 31 .

The central back 32 whose lower end is rotatably connected to the connecting portion 29 of the second waist bed portion 28 can be tilted forward by the head-up mechanism 75 shown in FIGS. 5, 8 and 9.

As shown in FIG. 5, the head-up mechanism 75 has a pair of head-up guides provided at both ends in the width direction of the central back 32 of the back bed portion 31 along the direction crossing the width direction (set up and down) 76. Both ends of the support shaft 77 are rotatably supported between one end of the pair of head-up guides 76 on the upper end side.

As shown in FIGS. 8 and 9, one end of the head-up arm 78 is connected to the end of the support shaft 77, respectively. The head-up roller 79 engaged with the head-up rail 55 is rotatably supported by the other end of the head-up arms 78.

On the side surface of the head-up guide portion 76, an arc-shaped first guide groove 81 and a second guide groove 82 are formed. The second guide groove 82 is also arc-shaped and presents a shape similar to the first guide groove 81 Concentric and the same angle in the circumferential direction.

As shown in FIG. 5, one end and the other end of the rod-shaped positioning member 83 are movably inserted into the pair of first guide grooves 81. One end of the arm member 84 is connected to one end of the positioning member 83 and the other end, respectively. The other end of the pair of arm members 84 is connected to the connecting rod 85.

A lever-shaped operating member 86 is provided in the middle of the arm member 84. The aforementioned operating member 86 has one end fixed to the arm member 84, and the other end side protrudes from the second guide groove 82 to the outer side of the head-up guide 76 .

As shown in FIG. 8, when the positioning member 83 is located at one end side of the first guide groove 81, the head-up roller 78 provided at one end is engaged with the head-up rail 55 so that it will not be pushed by the positioning member 83. The state of turning sideways and forward. As a result, the back bed portion 31 is kept in a state where it does not lie flat forward with the lower end as a fulcrum.

As shown in FIG. 9, when the arm member 84 is rotated with the connecting rod 85 as a fulcrum by the operation member 86, and the positioning member 83 is moved from one end side of the first guide groove 81 to the other end side, by The positioning member 83 presses the middle portion of the head-up arm 78.

With this, the head-up arm 78 takes the head-up roller 79 engaged with the head-up rail 55 as a fulcrum, that is, the head-up arm 78 takes one end as a fulcrum and the other end side faces the front of the back bed portion 31 shown by arrow W in FIG. 9 Swing sideways.

As a result, since the lower end of the back bed portion 31 pivots toward the front as a fulcrum, the head of the user whose upper body is located on the back bed portion 31 is raised forward.

As described above, after the back bed portion 31 is raised, the operating member 86 can be operated to move the positioning member 83 from one end of the first guide groove 81 to the other end, thereby leaning forward .

In addition, when the back bed portion 31 is in a flat state, if the operation member 86 is operated to move the positioning member 83 from one end of the first guide groove 81 to the other end, and the back bed portion 31 is erected, the standing bed portion 31 Then, the distance between the second waist bed portion 28 of the head-up rail 55 and the other end portion opposed to the back surface of the back bed portion 31 is enlarged from the state shown in FIG. 8 as shown in FIG. 9.

Thereby, as shown in FIG. 9, the positioning member 83 causes the head-up arm 78 to be pushed and held in a state of being rotated forward using the head-up roller 79 as a fulcrum, so that the back bed portion 31 can be tilted toward the front side.

That is, according to the above configuration, the back bed portion 31 can be tilted forward by operating the operation member 86 after the back bed portion 31 is driven in the upward direction by the back raising mechanism 37.

Not only that, when the back bed portion 31 is flat, if the operating member 86 is operated first to move the positioning member 83 from one end of the first guide groove 81 to the other end, the back bed portion 31 is raised, thereby The back bed portion 31 may be tilted forward in conjunction with the standing.

According to the bed device configured in this way, the operating shaft 56 for rotating the pair of side backs 33 provided on both sides of the central back 32 of the back bed part 31 as the back bed part 31 stands up The members such as the cable 59 and the pressing member 66 may be provided on the back side of the bed plate body 25, regardless of the operation or arrangement of members constituting the back-up mechanism 37 for driving the back-bed portion 31 up and down.

In other words, by the mechanism separated from the back raising mechanism 37, the side backs 33 provided on both sides of the central back 32 of the back bed portion 31 can be rotated forward when lifting the back.

Therefore, since the side back 33 can be rotated forward when the back is lifted by a mechanism that does not require assembly accuracy or manufacturing accuracy with respect to the back lift mechanism 37, the manufacturing or assembly of the mechanism can be easily performed.

The bed frame 5 and the bed plate body 25 of the bed device can be changed in length according to the height of the user. When changing the length of the bed frame 5 and the bed plate body 25, the length of the cable 59 for rotating the side back 33 in the forward direction when lifting the back must be adjusted.

The other end of the cable 59 whose one end is connected to the operating shaft 56 via the arm 58 is wound around the winding shaft 63 with an adjustable length. Therefore, when the length of the bed frame 5 and the bed plate body 25 has been changed, the length of the cable 59 may be changed in accordance with the change in the length. Therefore, even if the lengths of the bed frame 5 and the bed plate body 25 have been changed, one of the back bed portions 31 and the pair of side back portions 33 can be reliably rotated forward while holding the user's head while lifting the back .

The head-up mechanism 75 moves the positioning member 83 along the first guide groove 81 by the operating member 86 after the back bed portion 31 is raised, so that the back bed portion 31 can be kept tilted forward.

Moreover, if the positioning member 83 is moved along the first guide groove 81 before the back bed portion 31 is raised, it can be linked to the action of raising the back bed portion 31 by the back lift mechanism 37 The back bed portion 31 is inclined forward.

Therefore, depending on the user's physical condition, etc., the back bed portion 31 may be tilted forward when standing, or after the back bed portion 31 is raised, the back bed portion 31 may be inclined forward, or the The back bed portion 31 that has been tilted returns to the original state such as not tilted, and the state in which the back bed portion 31 is tilted is selected. Thereby, the convenience of using the bed device is improved.

The side raising mechanism 74 can be actuated by driving the back bed portion 31 in the rising direction, and the head raising mechanism 75 can be actuated by setting the position of the positioning member 83 relative to the first guide groove 81.

In other words, the side-lifting mechanism 74 and the head-up mechanism 75 can be actuated separately or simultaneously. Therefore, since the side-lift mechanism 74 and the head-up mechanism 75 can be used separately or simultaneously according to the user's physical strength or the like, the convenience of the bed device is further improved.

In addition, in the above-described first embodiment, the first and second waist bed portions 27 and 28 are provided on the bed plate body 25, and the back bed portion 31 is connected to the second waist bed portion 28. However, if the first and second waist bed portions 27 and 28 cannot be provided in the bed plate body 25, the back bed portion 31 may be connected to the fixed bed portion 26.

In addition, the pair of side backs 33 provided on both sides of the central back 32 of the back bed portion 31 may be divided into a plurality of in the vertical direction.

In addition, the bed device may not include the first and second waist bed portions 27 and 28. In such a case, the central back 32 of the back bed 31 may be rotatably attached to the fixed bed 26. In short, it suffices that the central back 32 is rotatably provided directly or indirectly on the fixed bed portion 26.

Next, the second embodiment of the invention will be described with reference to FIGS. 11 to 15. In addition, the same parts as those in the first embodiment are given the same symbols and their descriptions are omitted.

FIG. 11 shows the back side of the back bed portion 31, the first and second waist bed portions 27, 28, and the fixed bed portion 26 of the bed plate body 25 as in FIG. 6 of the first embodiment.

In the first embodiment, a head-up rail 55 or a head-up arm 78 fixed at one end to the lower surface (back surface) of the first waist bed portion 27, and a head-up guide 76 are provided to constitute the head-up mechanism 75, but the first In the second embodiment, the head-up mechanism 75 is configured without using the head-up rail 55, the head-up arm 78, the head-up guide 76, and the like. In addition, in the second embodiment, the symbol indicating the head-up mechanism is set to 75A.

The head-up mechanism 75A of the second embodiment will be described below. At the upper part of the back of the central back 32, an actuating shaft 56 is provided. The operating shaft 56 is rotatably held by a pair of holders 57. At both ends of the actuating shaft 56, as shown in FIGS. 11 and 14, one end of the pair of plate-shaped pair of mounting arms 101 is fixed in a state orthogonal to the axis of the actuating shaft 56.

At the other end of the mounting arm 101, there is also a plate-shaped movable arm 102 which is rotatably connected by a connecting shaft 103. At the other end of the movable arm 102, as shown in FIG. 13, a roller-shaped actuating member 104 is rotatably supported by the support shaft 105.

The actuating member 104 and the support shaft 105 constitute a restricting member that restricts the angle at which the back bed portion 31 inclines forward as described later. Furthermore, the restricting element may be constituted by the support shaft 105 only.

The actuating member 104 is provided to be movable within the back-up rail 53. The support shaft 105 is movably inserted into the long hole 106 formed at the end of the back-raising rail 53 along the longitudinal direction.

As shown in FIG. 12, long holes 106 are formed at both ends of the pair of back-raising rails 53 in the longitudinal direction. With such a configuration, the pair of aforementioned back-lift rails 53 can be positioned in the up-down direction without restriction. Furthermore, the long hole 106 may be substantially provided only at the end (upper end) of the back-up rail 53 on the back bed portion 31 side.

The movable arm 102 can be fixed in a linear state with respect to the mounting arm 101 by the locking mechanism 108 so as not to rotate. The locking mechanism 108 has a pair of movable pieces 111 as shown in FIGS. 13(a) and (b) and FIGS. 14(a), (b) and (c). 110 is rotatably attached to the middle portion of the pair of left and right attachment arms 101 in the longitudinal direction. One end of the locking rod 112 and the other end are fixed to the other ends of the pair of movable pieces 111, respectively.

As shown in FIGS. 12(a) and 13(a), on the side in the width direction of one end of the movable arm 102, that is, on the more distal side where the connecting arm 103 is connected to the mounting arm 101, A concave engaging portion 113 is formed.

As shown in FIGS. 12(a) and 13(a), the movable arm 102 is flexed with respect to the mounting arm 101, and rotated as shown in FIGS. 12(b) and 13(b) with respect to the mounting arm 101 is slightly linear, and the pivot 110 supporting the movable piece 111 serves as a fulcrum, and together with the movable piece 111, the locking lever 112 is rotated to elastically engage the engaging portion 113 of the pair of movable arms 102.

As a result, as shown in FIGS. 12( b) and 13 (b ), the movable arm 102 is held in a state of being almost linear with respect to the mounting arm 101 without rotation.

When the mounting arm 101 and the movable arm 102 are in a flexed state and are held linearly by the locking mechanism 108, the central back 32 of the back bed portion 31 is pushed forward through the operating shaft 56 to which the mounting arm 101 is mounted.

Thereby, the actuation shaft 56 is provided on the back bed portion 31 on the back side from the state shown in FIGS. 12(a) and 13(a), as shown in FIGS. 12(b) and 13(b), to pivotally connect The lower end of the connecting portion 29 of the second waist bed portion 28 serves as a fulcrum and tilts forward.

At this time, the actuating member 104 which is provided at the other end of the movable arm 102 and is engaged with the long hole 106 of the back lift rail 53 moves toward the back rail 53 in FIG. 12(b) in response to the tilt of the central back 32 Move in the direction of the upper end.

Furthermore, the support shaft 105 provided with the actuation member 104 is engaged with the long hole 106 of the back lift rail 53. Therefore, the back bed portion 31 is prevented from falling forward beyond the length formed by the mounting arm 101 and the movable arm 102 held in a straight line by the locking mechanism 108.

In other words, the actuating member 104 limits the inclination angle of the back bed portion 31, that is, prevents the central back 32 from being inclined too far forward.

In this manner, the head-up mechanism 75A of the second embodiment is equipped with the mounting arm 101 and the movable arm 102 on the actuating shaft 56 for the side-lift mechanism 74 described later.

Furthermore, the back-raising rail 53 holds the actuating member 104 via the support shaft 105 inserted into the long hole 106, and in the locking mechanism 108, the movable arm 102 rotatably connected to the mounting arm 101 is locked by the lever 112 Keep it non-rotatable and straight.

Therefore, according to the head-up mechanism 75A in this embodiment, it is possible to reduce the number of parts or simplify the structure. Moreover, since the backrest portion 31 can be tilted or the tilted state can be released only by operating the locking mechanism 108, its operation is also easy.

On the other hand, the side lifting mechanism 74 in the second embodiment has almost the same structure as the first embodiment. That is, as shown in FIG. 11, the side lifting mechanism 74 has a cable 59 as a transmission member. The cable 59 generates tension when the back bed portion 31 of the bed plate body 25 is driven by the back lifting mechanism 37 in the erecting direction. The tension causes the actuating shaft 56 to rotate in a predetermined direction.

The cable 59 is inserted into the outer tube 121. One end of the cable 59 is attached to the attachment 122, and the attachment 122 is provided on the lower surface of the first waist bed portion 27. One end of the cable 59 is engaged with the first roller 124 rotatably provided on the first holder 123 to change direction. The first holder 123 is provided on the lower surface of the fixed bed 26.

One end of the outer tube 121 is fixed to the first holder 123. That is, one end of the cable 59 is exposed from the outer tube 121 between the one end of the outer tube 121 and the attachment 122.

The middle portion of the outer tube 121 is greatly loosened and bent, and the middle portion is held by the jig 125 provided on the back surface (lower surface) of the second waist bed portion 28. The other end of the outer tube 121 is fixed to the second holder 127 provided at the upper end of the central back 32.

The other end of the cable 59 led out from the other end of the outer tube 121 is engaged with the second roller 128, and the second roller 128 is rotatably supported by the second holder 127. The end of the cable 59 is connected to the arm portion 58 which is provided at the central portion in the longitudinal direction of the operating shaft 56 and serves as a mounting member.

Thereby, the back-up arm 45 is driven in the upright direction by the back-up mechanism 37 shown in FIG. 4, and the back-up rail 53 is driven in the upright direction by the back-up roller 46 provided in the back-up arm 45.

Therefore, since the back bed portion 31 rises in conjunction with the back lift rail 53, the tension is generated in the cable 59 by the rise. When tension is generated in the cable 59, the actuating shaft 56 will rotate in a predetermined direction by the tension.

At both ends of the actuating shaft 56, as shown in FIGS. 14( a) to (c ), the pressing member 66 is provided so that the angle can be changed with respect to the circumferential direction of the actuating shaft 56. Next, when the back bed portion 31 is driven in the rising direction and the actuating shaft 56 is rotated by the cable 59, the pressing member 66 and the actuating shaft 56 are rotated in a predetermined direction, and the pair of side backs 33 are pressed back.

As a result, the pair of side backs 33 are displaced from the non-actuated position that has not rotated forward, to the operating position that has been pushed by the pressing member 66 and rotated forward. Such a configuration is the same as the first embodiment.

In addition, as shown in FIG. 11, in the portion of the back surface where the pressing member 66 on the back surface of the side back 33 rotates, the pressing member 66 is formed in the flat concave portion 33 a and can be smoothly rotated.

The cable 59 as a transmission member is inserted through the outer tube 121. Therefore, when a tension is generated in the cable 59 when the back is lifted, the cable 59 moves smoothly compared to the case where it is not inserted into the outer tube 121.

Both the outer tube 121 and the cable 59 have a length that allows the middle portion to relax. Therefore, even if the length from the fixed bed portion 26 to the back bed portion 31, for example, the length dimension of the back bed portion 31 becomes longer according to the height of the user, etc., it is possible to correspond to different lengths by slack.

In other words, the side lift mechanism 74 of the above configuration is similar to the first embodiment, and even if the length of the bed plate body 25 has been changed, it is possible to correspond without changing the length of the outer tube 121 or the cable 59.

In the head-up mechanism 75A of the bed device of the second embodiment configured as above, if the movable arm 102 is rotated linearly with respect to the mounting arm 101, in this state, the movable arm 102 is locked by the locking mechanism 108 into If it cannot be rotated, the central back 32 of the back bed portion 31 can be kept tilted forward as shown in FIGS. 12(b) and 13(b). Furthermore, at this time, the pair of side backs 33 are also tilted integrally with the center back 32.

Thereby, since the tilted central back 32 can be used to support the user's head while standing up, there is an advantage that the user can maintain an easy-to-eat posture, for example.

In addition, the support shaft 105 supporting the actuating member 104 is engaged with the long hole 106 of the back rail 53. Therefore, when the movable arm 102 is locked to the mounting arm 101 by the locking mechanism 108, when the back bed portion 31 is tilted forward, the back bed portion 31 can be prevented from tilting forward beyond the mounting arm 101 and the movable The length dimension of the arm 102.

That is, not only can the back bed portion 31 be tilted forward at a predetermined angle, but it can also be prevented from being excessively tilted.

On the other hand, if the locked state in which the movable arm 102 is locked by the locking mechanism 108 is released, the central back 32 may be kept in a state of not tilting forward as shown in FIGS. 12(a) and 13(a). At this time, the central back 32, that is, the back bed portion 31 can be deflected in the inclined direction by the cable 59 even if external force is applied.

As in the first embodiment, the side lift mechanism 74 positions the pressing member 66 at either of the actuated position and the non-operated position. When the back bed portion 31 is raised, the side raising mechanism 74 is set to a state in which it rotates forward while pressing the back of the side back 33, and does not rotate without pressing the side back Either of the 33 states.

Therefore, when the back bed portion 31 is driven in the rising direction, it can be set to selectively actuate the head-up mechanism 75A and the side-lift mechanism 74. In other words, since either of the head-raising mechanism 75A and the side-lift mechanism 74 can be operated, on the other hand, or both, it can be used in a state desired by the user.

Furthermore, regardless of whether the head raising mechanism 75A drives the back raising mechanism 37 to erect the back bed portion 31, if the mounting arm 101 is held in a locked state that cannot be rotatably locked to the movable arm 102 by the locking mechanism 108, then The central back 32 can be maintained inclined forward.

In the first and second embodiments described above, the transmission member using the cable as a means for rotating the actuating shaft when lifting the back has been exemplified. As the transmission member, a structure in which the actuating shaft can be rotated by a rotational drive source such as a transmission motor can be used instead of the cable. Furthermore, the rotary drive source can also be operated in conjunction with the back lifting mechanism when the back of the back bed is lifted.

1: bottom frame 2: Setting foot 3: Up and down drive mechanism 4: connecting rod 5: bed frame 6: Drive source for up and down 11: Body frame 12: Adjust the frame 14: Supporting member 15: Arm member 16: Support hole 17: plate body 18: Decorative components 25: bed board 26: Fixed bed 27: 1st waist bed 28: Second waist bed 29: Connection Department 31: Back bed 32: Central back 33: lateral back 33a: concave part 35: The first foot bed 36: Second foot bed 37: Back lifting mechanism 38: Drive Department 41: 1st drive shaft 42: 2nd drive shaft 43: connecting rod 44: Link arm 45: Raise the back arm 46: Lift the back roller 47: Install connecting rod 48: Foot lift roller 49: Foot connecting rod 51: Linkage linkage 53: Lift back track 55: Head-up track 56: Actuating shaft 57: Retainer 58: arm (mounting member) 59: Cable (transmission member) 60: roller 61: Cross member 62: Retainer 63: scroll axis 63a: Pulley 64: fastening member 66: Pushing member 67: fulcrum 68: Installation ditch 69: stop member 71: clearance 72: Mounting shaft 73: holding member 73a: lower end 73b: upper end 74: side lift mechanism 75,75A: Head-up mechanism 76: Head-up guide 77: fulcrum 78: raise the arm 79: Head-up roller 81: 1st guide groove 82: 2nd guide groove 83: positioning member 84: arm member 85: connecting rod 86: Operating component 101: mounting arm 102: movable arm 103: connecting shaft 104: Actuating member (limiting component) 105: fulcrum 106: long hole 108: locking mechanism 110: support shaft (restriction assembly) 111: movable piece 112: Locking lever 121: Outer tube 122: mounting tool 123: 1st retainer 124: the first roller 125: Fixture 127: 2nd retainer 128: 2nd roller W, X: arrow

FIG. 1 is a perspective view showing a first embodiment of the present invention and a bed device for raising a back bed portion.

Fig. 2 is a perspective view of the bed plate body of the aforementioned bed device.

Fig. 3 is a plan view showing the bed frame.

Fig. 4 is an explanatory diagram of a drive mechanism for driving the bed plate body up and down.

FIG. 5 is a diagram showing the back bed portion of the bed plate body, the first and second waist bed portions, and the back side of the fixed bed portion.

FIG. 6 is a diagram showing a state of setting the cables that drive the side backs of the back bed portion along with the back-up driving.

FIG. 7(a) is a plan view of one end portion where the actuating shaft of the pressing member is provided, and FIG. 7(b) is a side view of the one end portion.

8 is a side view showing the bed plate body of the head-up mechanism in a state where the back bed portion is not tilted forward when the back bed portion is raised.

9 is a side view showing the bed plate body of the head-up mechanism in a state where the back bed portion is tilted forward when the back bed portion is raised.

FIG. 10(a) is a rear view of a state where the side back of the back bed portion is not inclined toward the front side of the central back, and FIG. 10(b) is a rear view of the state where the side back is inclined toward the front side of the central back.

11 is a diagram showing the back side of the back bed portion, the first and second waist bed portions, and the fixed bed portion of the bed plate body according to the second embodiment of the present invention.

FIG. 12(a) is a side view of the bed plate body shown in FIG. 11, and FIG. 12(b) is a side view of a state where the back bed portion is inclined forward by the head-up mechanism.

13(a) is an enlarged side view of the back bed portion of FIG. 12(a), and FIG. 13(b) is an enlarged side view of the back bed portion of FIG. 12(b).

FIG. 14(a) is a plan view showing a side-lift mechanism and a head-up mechanism provided on the back side of the back bed portion, FIG. 14(b) is a front view of the same, and FIG. 14(c) is a side view of the same.

Fig. 15 is an enlarged view of a connecting portion of the mounting arm and the movable arm of the head-up mechanism.

53: Lift back track

56: Actuating shaft

58: arm (mounting member)

59: Cable (transmission member)

60: roller

61: Cross member

62: Retainer

63: scroll axis

63a: Pulley

64: fastening member

74: side lift mechanism

Claims (13)

A bed device characterized by: Bed frame The bed board has: Fixed bed portion, fixed to the aforementioned bed frame; and The back bed portion has a central back portion and a pair of side back portions, and is configured to be rotatable with respect to the fixed bed portion, and the pair of side back portions are connected to both sides of the central back portion in a forward rotation direction; Lifting the back mechanism to raise and lower the back bed portion of the bed plate body; Actuating shaft, the axis is along the width of the central back, and is rotatably supported by the back of the central back; The mounting member is arranged in the middle of the actuating shaft; One end of the transmission member is fixed to the mounting member, and the other end is fixed to the part that actuates the back-lifting mechanism to drive the back-bed portion in the erecting direction and generates tension, and the tension causes the aforementioned The actuation shaft rotates in a predetermined direction; and The pressing member is provided at both ends of the actuating shaft, can change the angle with respect to the circumferential direction of the actuating shaft, and is driven in the standing direction at the back bed portion, and the actuating shaft is rotated by the transmission member When moving, the pair of side backs are positioned at any one of an actuating position that rotates forward and a non-actuating position that does not rotate forward. A bed device characterized by: Bed frame The bed board body is provided with a back bed portion, and the back bed portion includes a central back portion and a pair of side back portions, and the pair of side back portions are rotatably connected to both sides of the central back portion in a forward direction; Lifting the back mechanism to raise and lower the back bed portion of the bed plate body; The actuating shaft, the axis is along the width of the central back, and is rotatably supported by the back of the central back; and The pressing member is provided at both ends of the actuating shaft, can change the angle with respect to the circumferential direction of the actuating shaft, and when the back bed portion is driven in the erecting direction and the actuating shaft is rotated, the pair of the aforesaid The back of the side portion is positioned at either an actuated position that rotates forward or a non-actuated position that does not rotate forward. The bed device according to claim 1, wherein the mounting member is arm-shaped, one end is connected to the actuating shaft, the other end protrudes outward in the radial direction of the actuating shaft, and the other end of the mounting member is connected to the end of the transmission member . The bed device according to claim 1 or 2, wherein the pressing member is provided on the actuating shaft in a manner that can be positioned at the actuated position and the non-actuated position by a positioning mechanism, The aforementioned positioning mechanism includes: The support shaft is inserted into the end of the actuating shaft in a rotatable and movable manner in the direction of the shaft; The stop member is provided at the front end of the support shaft; Installing a shaft such that the axis is inclined at a predetermined angle with respect to the axis of the actuating shaft, and the pushing member is provided at the front end; and The holding member is provided at the end of the actuating shaft. When the back bed portion is driven in the rising direction by the back-lifting mechanism, the pressing member provided at the other end of the mounting member is positioned and held at the actuating position. The bed device according to claim 1, wherein the aforementioned transmission member is provided with an adjustable length, The aforementioned bed frame has an adjustable length configuration, The length of the transmission member is set according to the length of the bed frame. The bed device according to claim 1 or 2, wherein the member constituting the mechanism for driving the back side portion of the back bed portion forward when the back bed portion is driven in an upright direction, and the member constituting the back raising mechanism are not repeat. A bed device characterized by: Bed frame The bed board has: Fixed bed portion, fixed to the aforementioned bed frame; The waist bed portion is arranged to be rotatable relative to the fixed bed portion; and Back bed, Lifting the back mechanism to raise and lower the waist bed portion and the back bed portion of the bed plate body; A head-up guide portion is provided at the end of the back bed portion on the waist bed portion side, and an arc-shaped first guide groove is formed on the side; A head-up rail, one end is fixed to the waist bed portion, and is arranged to span the back bed portion and the back side of the waist bed portion; A head-up arm, one end of which is pivotally connected to the head-up guide part, has a head-up roller rotatably engaged with the head-up track at the other end, and the head-up roller rotates along the head-up track together with the head-up guide part Rotating with the one end as a fulcrum, rotating the back bed portion forward with respect to the waist bed portion; and The positioning member has an end inserted into the first guide groove and can be selectively positioned at a first position and a second position. The first position is not located by one end of the first guide groove The head-lifting arm rotates the back bed portion forward, and the second position is the position where the back-bed portion rotates forward by the head-up arm when it is located at the other end of the first guide groove . The bed device according to claim 7, wherein an arc-shaped second guide groove juxtaposed with the first guide groove is formed on the side of the head-up guide portion, and an arm member is provided, and the arm member is one end Pivotally connected to the side of the head-up guide, and the end of the positioning member connected to the other end, An operation member is provided in the second guide groove. The operation member rotates the arm member to move the positioning member between one end and the other end of the first guide groove. The bed device according to claim 7, which positions the positioning member at the second position of the first guide groove when the back bed portion is in a flat state before being driven by the back lifting mechanism in the upright direction In this way, the back bed portion can be linked with the back raising portion by the back lifting mechanism to stand up and fall forward. A bed device characterized by: Bed frame The bed board has: Fixed bed portion, fixed to the aforementioned bed frame; and The back bed portion has a central back portion and a pair of side back portions. The pair of side back portions are rotatably connected to both sides of the central back portion in a forward direction, and the lower end of the central back portion can be rotated relative to the fixed bed portion move; Lifting the back mechanism to raise and lower the back bed portion of the bed plate body; A side lifting mechanism, when the back bed portion of the bed plate body is driven in the rising direction by the back lifting mechanism, rotating the pair of side back portions forward; and The head-up mechanism, when the back bed portion of the bed plate body is driven in the rising direction by the back-up mechanism, rotates the back bed portion forward, The aforementioned side-lifting mechanism and the aforementioned head-up mechanism can be actuated either or both at the same time. A bed device characterized by: Bed frame The bed board body has: a waist bed portion rotatably provided at one end of the bed frame, and a back bed portion rotatably connected to the other end of the waist bed portion at one end; The back-lifting mechanism has: a back-lifting arm and a back-lifting track, which raises and lowers the back-bed portion of the bed plate body. A back-up roller is provided on the end side, and the back-up rail is one end portion mounted on the lower side of the waist bed portion and for the back-up roller to be rotatably engaged; and The head-up mechanism, when the back bed portion of the bed plate body is driven in the rising direction by the back-up mechanism, rotates the back bed portion forward, The aforementioned head-up mechanism has: Actuating shaft, the axis is along the width direction of the back bed portion, and is rotatably supported by the back surface of the back bed portion; One end of the mounting arm is fixed to the actuating shaft without rotation; A movable arm, one end of which is rotatably connected to the other end of the aforementioned mounting arm; A locking mechanism that keeps the movable arm in a pair that cannot rotate the mounting arm, and tilts the front end of the back bed portion forward as a fulcrum; and The restricting component is provided on the other end of the movable arm so as to be movable along the other end of the back lifting rail, and when the back bed portion is held by the locking mechanism at the lower end as a fulcrum, it is tilted forward At this time, the angle at which the back bed portion is inclined forward is restricted. The bed device according to claim 11, wherein the back bed portion has a central back portion and a pair of side back portions, and the pair of side back portions are rotatably connected to both sides of the central back portion in a forward direction, The bed device further includes a side lifting mechanism, which rotates the pair of side backs forward when the back bed portion is driven in the rising direction by the back lifting mechanism. The aforementioned side lift mechanism includes: The transmission member is to rotate the actuating shaft in a predetermined direction when the back bed portion of the bed plate body is driven by the back lifting mechanism in the rising direction; and The pressing member is provided at both ends of the actuating shaft and can change the angle with respect to the circumferential direction of the actuating shaft, and when the back bed portion is driven in the rising direction and the actuating shaft is rotated by the transmission member, Position the pair of side backs at either an actuated position that rotates forward or a non-actuated position that does not rotate forward. The bed device according to claim 12 is based on the setting of whether the locking mechanism is used to integrate the movable arm with the mounting arm, and whether the pushing member is moved to any one of the actuated position and the non-actuated position The setting can selectively actuate the head-up mechanism and the side-lift mechanism in response to the driving of the back bed portion in the rising direction.

Images