JP2812204B2 - Undulation mechanism of floor in bed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for raising and lowering a floor in a bed, and more particularly, to a floor in a bed in which the floor can be raised and lowered more than usual at a normal speed. It relates to the undulating mechanism of the part.

[0002]

2. Description of the Related Art In general, a mechanism for raising and lowering a floor portion of a bed includes a screw shaft connected to an output shaft of a driving source such as a motor or a manually rotating crank shaft provided below the floor portion, as an internal thread of an operating rod. The operating rod is screwed, and the distal end of the operating rod is connected to the distal end of a push-up arm protruding from the lower surface of the floor provided to be able to move up and down, and rotates the output shaft of a drive source such as the motor or crankshaft. By moving the operating rod forward and backward, the push-up arm on the lower surface of the floor is rotated, thereby gradually raising and lowering the floor.

However, in an emergency such as when the patient's condition suddenly changes, it is necessary to raise and lower the floor quickly beyond the normal raising and lowering speed driven by the driving source. As a mechanism for urgently raising and lowering the floor as described above, for example, Japanese Utility Model Publication No. Hei 6-2670 discloses a mechanism in which a screw shaft is connected to an output shaft of a motor as a driving source and inserted through a cover pipe. A female screw is screwed into the female screw, one end of the starting portion pipe is attached to the female screw, and the screw shaft is made to enter the starting portion pipe, and a projection is provided on an outer peripheral portion near the other end portion of the starting portion pipe, The other end of the starting pipe is screwed into a connecting pipe having a threaded groove formed in an inner wall, and a back-raising arm that is inclined and protruded from the lower surface of the floor is connected to the connecting pipe via a clutch. By operating the clutch interposed between the connecting pipe and the back raising arm to disconnect the connected state and make the connecting pipe free,
Due to the load exerted from the floor via the back-raising arm, the connecting pipe rotates and the protrusion on the outer peripheral portion near the other end of the starting pipe advances through the threaded groove of the connecting pipe, onto the starting pipe. A floor raising / lowering mechanism having an emergency release means capable of retreating and returning a floor to an original position is disclosed. Japanese Utility Model Publication No. 5-47748 discloses a motor as a drive source. By connecting the operating rod which can move forward and backward by the activation of the cylinder, the cylinder constituting the gas spring is connected to this operating rod in the same direction as the operating rod, the operating arm of the back bottom is connected to the rod of the gas spring, and the tip of the rod When the gas spring unlocking means is released by operating the gas spring unlocking means, the rod is buffered in the cylinder. And retracted, starting unit of floor undulations mechanism is disclosed that the back bottom is possible lodging return to its original position.

[0004]

However, in the above-described conventional mechanism for raising and lowering the floor, although the floor in the raised state can be returned to the original lowered state urgently, the former actual floor 6 is used. In the mechanism disclosed in JP-A-2670, when the floor part in the wake-up state is urgently returned to the lying state, the starting part pipe projects from the cover pipe and remains at the position when the floor part was woken up. However, the floor cannot be woken up by the motor as it is. Therefore, in order to raise the back again by the motor, the motor is rotated in the reverse direction to retract the starting portion pipe to the original position,
The motor needs to be able to raise and lower the floor. Also, in the latter mechanism disclosed in Japanese Utility Model Publication No. 5-46748, when the back bottom in the rising state is urgently returned to the lying state, the operating rod is left as it was when the back bottom was raised. As it is, the back bottle cannot be woken up by the motor as it is. Therefore, in this case, in order to raise the back again, the motor is rotated in the reverse direction to retract the operating rod to the original position.
At this time, the unlocking means of the gas spring is operated to release the locked state of the rod, the cylinder is retreated together with the retraction of the operating rod, the rod is pulled out of the cylinder, and the operation of the unlocking means is stopped. It is necessary to lock the rod of the gas spring so that the back bottom can be raised and lowered by the motor.

As described above, in the conventional floor raising / lowering mechanism, it is possible to urgently return the floor in the raised state to the original lying state, but it is possible to raise the floor with the motor again as it is. Therefore, it is necessary to retreat the starting pipe and the operating rod to the original position by, for example, rotating the motor in the reverse direction, so that the floor can be raised and lowered again. In addition, in these up-and-down mechanisms, the floor part in the up-raised state as described above can be returned to the down state by retreating the connecting pipe or the rod of the gas spring, but usually, the floor part is in the down state. In some cases, the connecting pipe and the rod of the gas spring are in an extended state with respect to the starting pipe and the cylinder, so that it is impossible to urgently wake up the floor in the lying state. In addition, in addition to the above, for example, Japanese Utility Model Publication No. 6-2671, Japanese Utility Model Application Laid-Open No. 5-41.
No. 460, Japanese Utility Model Laid-Open No. 5-44118, and the like also disclose a similar mechanism capable of urgently returning a floor portion in a rising state to a lying state. However, in any of the mechanisms, when the floor portion in the rising state is urgently returned to the lying state, the floor portion cannot be raised again by the motor as it is, and the motor or the like cannot be used. It is necessary to return the starting pipe and the like to a state where the floor can be raised and lowered again by reversely rotating the floor, and it is impossible to urgently raise the floor in the lying state.

In view of the above, in the present invention, not only can the bed portion of the bed in the wake-up state be brought down to a state in which it exceeds the normal speed by the drive source,
Even when the floor is in the lying state, it can be quickly woken up beyond the normal wake-up speed by the drive source, and after urging the floor as described above urgently, the motor or the like is rotated in reverse. It is an object of the present invention to provide an up-and-down mechanism for a floor portion of a bed which enables the floor portion to be raised and lowered again from the same state without requiring an operation to perform the same.

[0007]

According to the present invention, in order to achieve the above object, a floor undulating mechanism for a bed according to the present invention is provided with a drive source such as a motor below the floor of the bed and rotated by the drive source. A first bevel gear is mounted on a rotating shaft, the first bevel gear meshes with a second bevel gear mounted on a screw shaft, and the screw shaft is screwed into a screw for mounting the same on an operating rod. Is connected to the tip of a push-up arm protruding from the lower surface of the floor provided so as to be able to move up and down, and the first bevel gear attached to the rotary shaft is attached to a screw shaft. And a disconnecting means for disconnecting from the main body. In the above case, the first bevel gear attached to the rotating shaft is attached so as to be non-rotatable and slidable in the axial direction with respect to the rotating shaft, and the first bevel gear is attached to the second bevel gear attached to the screw shaft. Disengaging means for engaging the first bevel gear attached to the rotating shaft and separating from the second bevel gear against the elastic force of the elastic urging means is provided, while being engaged by the elastic force of the elastic urging means. Can be. Further, in this case, the holding member is rotatably connected to the first bevel gear attached to the rotating shaft, a screw shaft is protruded from the holding member, and the holding member is moved by the elastic force of the elastic urging means. The first bevel gear urged and connected to the holding member may be configured to rotate in a direction in which the first bevel gear meshes with the second bevel gear.

[0008]

The mechanism for raising and lowering the floor of the bed according to the present invention is as follows.
When the driving source is driven to rotate the rotating shaft, the screw shaft rotates through the first bevel gear of the rotating shaft and the second bevel gear of the screw shaft. As the operating rod advances and retreats due to the rotation of the shaft, the push-up arm of the floor connected to the distal end of the operating rod rotates, and the floor rises and falls. When urging the floor beyond the normal undulating speed of the drive source, the separating means is operated to separate the first bevel gear of the rotating shaft from the second bevel gear of the screw shaft. For example, the screw shaft is freely rotatable, and the operating rod can freely move forward and backward while rotating the screw shaft, and can raise and lower the floor beyond the undulating speed of the driving source. When the operation of the separating means is released, the first bevel gear of the rotating shaft is meshed with the second bevel gear of the screw shaft again, and the floor returns to a state where it can be raised and lowered again by the driving source. At this time, the first bevel gear is moved to the second
In such a configuration, the first bevel gear of the rotating shaft is automatically re-engaged by the elastic urging means only by releasing the operation of the separating means. And the floor returns to a state where it can be raised and lowered by the drive source. Further, a holding member is rotatably connected to the first bevel gear attached to the rotating shaft, a screw shaft is protruded from the holding member, and the holding member is urged by the elastic force of elastic urging means. The first bevel gear connected to the holding member is
In the case where the first bevel gear is configured to rotate in the direction in which it meshes with the bevel gear, the first bevel gear can be separated from the second bevel gear by rotating the screw shaft of the holding member. When the rotation of the screw shaft of the member is released, the screw shaft of the holding member is reversed by the resilient force of the elastic urging means, and the two bevel gears automatically return to the meshing state again.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a floor undulating mechanism according to the present invention.

FIG. 1 is a perspective view of a couch 1 for an intensive care unit showing an example of a couch employing a floor raising / lowering mechanism according to the present invention. In the couch 1, a main body frame 4 is mounted on a leg base 2 provided with casters 3 so as to be able to move up and down by a lifting means (not shown). On the upper surface side of the main body frame 4, a back floor plate 41, a seat floor plate 42, and two front and rear leg floor plates 43 and 44 constituting a floor portion are respectively attached. A head board 5 and a foot board 6 are attached to the front and rear of the main body frame 4, respectively. Further, the four corners of the main body frame 4 are rotatable to absorb an impact at the time of a collision with a wall surface or the like during movement. Bumpers 7 are attached.

As shown in FIG. 2, each floor plate 41, 42, 43, 44 constituting the floor is
a, 42a, 43a, 44a to floor panels 41b, 42a.
b, 43b, and 44b are integrally attached. The back floor plate 41 is disposed at a front portion of the main body frame 4 near the headboard 5, and a rear end thereof is pivotally attached to the main body frame 4 so as to be freely rotatable. Upper back arm 8 projecting diagonally
The distal end of an operating rod 10 of an actuator 9 having one end pivotally connected to the main body frame 4 is connected to the lower end of the main body frame 4. By moving the operating rod 10 of the actuator 9 forward and backward, the back floor plate 41 comes up and down. ing. Also, leg floor plate 43,
Reference numeral 44 denotes a leg push-up arm which is rotatably connected to each other, has a front end portion of a front leg floor plate 43 pivotally connected to the main body frame 4 and has an obliquely projecting lower surface. 1
The lower end of 1 is connected to the distal end of the operating rod 13 of the leg-mounted actuator 12. By moving the operating rod 13 of the leg-mounted actuator 12 forward and backward, the front leg floor plate 43 is tilted. Along with the tilting, the rear leg floor plate 44 pivotally attached to the rear end tilts.

The back lifting actuator 9 is shown in FIG.
As shown in FIG. 2, a motor 15 as a drive source is provided horizontally inside a main body 14, and an output shaft 16 of the motor has a worm 17 attached to the output shaft 16 and meshes with the worm 17. A vertical rotating shaft 19 is connected by a worm gear 18. A first bevel gear 20 is attached to the lower end of the connecting shaft 19 so as to be slidable in the axial direction of the rotating shaft 19 and non-rotatable with a key 21 or the like. The lower surface of the first bevel gear 20 has the bevel gear 2
The holding member 22 is rotatably connected to and fixed to the main body 14 through a cover member 24 attached to the lower surface of the actuator body 14. A coil spring 25 is interposed between the holding member 22 and the inner surface of the cover member 24 so as to protrude from the lower surface.
The elastic member 5 is elastically urged upward so that the holding member 22 rotates. The first bevel gear 20 of the rotating shaft 19 is provided with a second bevel gear 27 attached to the base end of a screw shaft 26 provided orthogonal to the rotating shaft 19 in a meshing state. And this screw shaft 26 is
Guide rod 2 projecting laterally from actuator body 14
8 is inserted into a pipe-shaped operating rod 10 inserted in
A slider 30 is provided at the base end of the operating rod and screwed into a screw 29, and a slider 30 sliding in the operating rod 10 is provided at the distal end thereof. An operating rod 31 is attached to the tip of the screw shaft 23 of the holding member 22 protruding from the actuator body 14, and one end of an operating wire 32 is attached to the operating rod 31 as shown in FIGS. The other end of the operation wire 32 is connected and fixed to an operation lever 33 provided on the lower surface of the main body frame 4, and the operation wire 33 is operated by operating the operation lever 33.
, The screw shaft 23 of the holding member 22 can be rotated by remote control.

The operation of raising and lowering the back floor plate 41 in the above-described floor raising and lowering mechanism according to the present invention will be described below. First, as shown in FIGS.
The first bevel gear 20 is engaged with the second bevel gear 27 of the screw shaft by the coil spring 25, and in this state, the motor 15 of the actuator 9 is started to rotate the output shaft 16 to raise the back. When this is done, the rotating shaft 19 connected via the worm 17 and the worm gear 18 rotates, and via the first bevel gear 20 attached to the rotating shaft 19 and the second bevel gear 27 attached to the screw shaft 26. The screw shaft 26 rotates, and the operating rod 10 projects from the guide rod 28 of the actuator 9. As a result, the push-up arm 8 on the lower surface of the back floor plate 41 connected to the distal end of the operating rod 10 rotates, and the back floor plate 41 gently rises. When the motor 15 of the actuator 9 is rotated in the reverse direction, the operating rod 10 retreats into the actuator main body 14 and the back floor plate 41 gently falls down.

If it becomes necessary to raise or lower the back floor plate 41 beyond the raising and lowering speed of the actuator 9 by the motor 15 due to a sudden change in the patient's condition or the like, as shown in FIG. When the provided operation lever 33 is pressed down, the end of the operation wire 32 connected to the operation lever 33 is pulled, and the screw shaft 23 of the holding member 22 connected and fixed to the other end of the operation wire 32 is rotated. With this rotation, the screw shaft 23 of the holding member 22 descends so as to protrude downward from the cover member 24, and the first bevel gear 20 rotatably connected to the holding member 22 moves downward along the rotation shaft 19. It slides and is separated from the second bevel gear 27 attached to the proximal end of the screw shaft 26 as shown in FIGS. As a result, the screw shaft 26 is separated from the motor 15 serving as a driving source and becomes freely rotatable, and the operating rod 10 freely advances and retreats with respect to the screw shaft 26 while rotating the screw shaft 26. Reference numeral 41 denotes a state in which it can freely undulate regardless of the motor 15 which is the drive source of the actuator 9. Operation lever 3
3 is released, the helical shaft 23 of the holding member 22 that has been rotated and protruded against the resilient force of the coil spring 25 is reversely rotated by the resilient force of the coil spring 25 to rotate the first bevel gear 20. Is returned to the original state as if by pushing up the first shaft of the rotating shaft 19.
Of the second bevel gear 2 of the screw shaft 26 again.
7, the screw shaft 26 is rotated by the drive of the motor 15 to move the operating rod 10 forward and backward.
Can be undulated.

As described above, according to the floor raising / lowering mechanism according to the present invention, the motor 15 and the screw shaft 26 are connected by pressing down the operation lever 33 regardless of the state of the back floor plate 41 in any raised / lowered state. The screw shaft 26 is freely rotatable only by disengaging the engaged state between the first bevel gear 20 attached to the rotating shaft 19 and the second bevel gear 27 attached to the base end of the screw shaft 26. Thus, the back floor plate 41 can be quickly raised and lowered beyond the rotation speed of the motor 15. By simply releasing the operation lever 33, the first and second bevel gears are brought into a meshing state again by the resilient force of the coil spring 25, and the screw shaft 26 and the motor 15 are connected. 41 can be returned to an up-and-down state. As described above, in the conventional undulating mechanism, the connecting pipe and the gas cylinder are provided so as to be able to advance and retreat with respect to the screw shaft, and in the case of an emergency, the connecting pipe and the gas cylinder are retracted so that the floor portion can be laid back and restored. In the case where the floor portion in the wake-up state is urgently returned to the upright position, it is necessary to reverse the motor to retract the screw shaft. However, in the present invention, even if the back floor plate 41 is urgently raised and lowered, It is not necessary to return the screw shaft 26 in accordance with the position of the raised back floor plate 41 as in the above, and the back can be raised again by the motor from that position only by engaging the two bevel gears 20, 27. Furthermore,
In the conventional undulating mechanism, since the connecting pipe and the gas cylinder are in the extended state during the undulating operation of the floor by the ordinary motor, it is impossible to urgently wake the floor in the lying state, In the undulating mechanism according to the present invention, such a connecting pipe or gas cylinder is not used, the first bevel gear 20 is separated from the second bevel gear 27, and the screw shaft 26 and the motor 15 as a driving source are separated. The back-floor board 41 can be freely raised and lowered by releasing the connection of the back-floor board 41, so that the back-floor board 41 can be freely raised and lowered in any direction in which the back-floor board 41 is raised or lowered in any position. Is possible.

Although the motor 15 is used as a drive source for the actuator 9 in the above embodiment, a drive source such as a crankshaft that is manually driven by operating a handle may be used as the drive source. Further, in the embodiment, the above-mentioned emergency undulating mechanism is provided only in the back floor portion 41, but the leg floor portion 4 is provided.
A similar undulating mechanism can be provided for the members 3 and 44. Further, in the embodiment, the motor 15 and the screw shaft 26 are separated by pressing down the operation lever 33, but may be configured to be separated by raising the operation lever 33.

[0017]

As described above, the floor raising / lowering mechanism of the bed according to the present invention moves the rotating shaft connected to the driving source and the operating rod for rotating the push-up arm protruding from the lower surface of the floor. The bevel gears are connected to each other via a pair of bevel gears meshing with each other, and both bevel gears can be separated by separating means, and the screw shaft is separated from the drive source by separating between the two bevel gears. By being configured to be freely rotatable, the floor portion can be quickly raised and lowered in the event of an emergency by exceeding the raising and lowering speed of the drive source, and the two bevel gears can be maintained even after the emergency floor raising and lowering operation. By simply returning the screw shaft to the meshing state, the floor can be raised and lowered again by the drive source, and the motor as the drive source is rotated in the reverse direction to return the screw shaft to the original state, as in the conventional case. Although it is not necessary, and in the conventional up-and-down mechanism, it was not possible to urgently raise the floor in the lying state, but in the present invention, not only the urging of the floor in the rising state, It is also possible to urgently raise the floor in the lying state beyond the wake-up speed by the drive source.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bed employing a floor undulating mechanism according to the present invention.

FIG. 2 is an exploded perspective view showing an attachment structure between a main body frame and a floor.

FIG. 3 is an explanatory side view of a main part showing the undulating operation of the back floor plate.

FIG. 4 is a longitudinal sectional view of a back-raising actuator.

FIG. 5 is an explanatory diagram showing a relationship between a back-lifting actuator and an operation lever.

FIG. 6 is an explanatory view showing how a back floor plate is raised and lowered by a motor.

FIG. 7 is a longitudinal sectional view of a main part showing a structure of a connecting portion between the rotating shaft and the screw shaft in a connected state.

FIG. 8 is an explanatory view showing a state in which the back floor plate is raised and lowered while being separated from the motor.

FIG. 9 is a longitudinal sectional view of a main part showing a structure of a connecting portion between the rotating shaft and the screw shaft in a separated state.

[Explanation of symbols]

1 bed, 2 legs, 3 casters, 4 floor, 5 headboard, 6 footboard, 7 rotating bumper, 8 back push upper arm 8, 9 actuator,
10 operating rod, 11 leg push-up arm, 12 actuator, 13 operating rod, 14 actuator body,
15 motors, 16 output shafts, 17 worms, 1
8 Worm gear, 19 rotating shaft, 20 bevel gear,
21 key, 22 holding member, 23 screw shaft, 24
Cover member, 25 coil spring, 26 screw shaft, 27 bevel gear, 28 guide rod, 29 female thread, 30 slider, 31 operating rod, 32 operating wire, 33 operating lever, 41 back floor board, 42
Hip floor board, 43 leg floor board, 44 leg floor board.

Claims (3)

(57) [Claims] 1. A drive source such as a motor is mounted below the bed of a bed, a first bevel gear is mounted on a rotating shaft rotated by the drive source, and the first bevel gear is mounted on a screw shaft. The screw shaft is screwed into the screw to attach the screw shaft to the operating rod, and the tip of the operating rod is attached to the tip of the push-up arm protruding from the lower surface of the floor provided so as to be able to move up and down. Coupled with the first shaft attached to the rotating shaft.
A bed raising and lowering mechanism in a bed provided with a separating means for separating the bevel gear from the second bevel gear attached to the screw shaft. 2. A first bevel gear attached to a rotating shaft is attached so as to be non-rotatable with respect to the rotating shaft and slidable in the axial direction.
The first bevel gear is meshed with the second bevel gear attached to the screw shaft by the elastic force of the elastic urging means, and the first bevel gear attached to the rotating shaft is elastically driven by the elastic urging means. The mechanism for raising and lowering a floor in a bed according to claim 1, further comprising a separating means for separating the second bevel gear against the force against the force. 3. A holding member is rotatably connected to a first bevel gear attached to a rotary shaft, a screw shaft is protruded from the holding member, and the holding member is elastically biased by an elastic force. 3. The mechanism according to claim 2, wherein the first bevel gear urged and connected to the holding member rotates in a direction in which the first bevel gear meshes with the second bevel gear.