JP2768406B2 - Linear drive mechanism with emergency release means - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear drive mechanism provided with an emergency release means, which is suitable as a power source for a floor elevating mechanism such as a bed.

[0002]

2. Description of the Related Art In recent years, beds equipped with a floor undulating mechanism have been widely used. In addition, beds equipped with an elevating mechanism for raising and lowering the entire floor have been introduced. In addition, due to the labor shortage of nurses and the like in recent years, the floor raising / lowering mechanism and the elevating mechanism have been electrified for labor saving. According to the electric bed, the patient can operate the floor undulating mechanism by himself to take a desired posture. By the way, the electric floor undulating mechanism as described above,
The floor elevating mechanism has a drawback that it cannot be moved in the event of a failure or power failure. That is, for example, when the floor is raised to a high position, if the electric mechanism breaks down or stops due to a power failure, the floor cannot be lowered to the original low position, and the patient descends from the floor. Can not do. For this reason, means for moving the mechanism by rotating the motor output shaft using a manually operated handle is employed.

[0003]

However, since such a function is not frequently used, the existence of the function itself is often not recognized. In addition, even if the user knows the above function and is taught how to use it, there are cases where it is impossible for a nurse or the like who is well versed in operation.
For example, the motor must be bent down and the handle must be mounted on the motor because it is located at the bottom of the board, and when operating, the posture in the operation is low and unnatural posture, especially for the operator However, it was impossible for the elderly. The present invention has been proposed from such a background, in an emergency, such as at the time of a power failure, so that the floor portion that has been suspended in operation can be quickly returned to the original,
In particular, it is an object of the present invention to provide a linear drive mechanism provided with emergency release means, which is suitable as a power source of a floor elevating mechanism such as a bed.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a linear motion drive mechanism for applying a driving force in a linear direction to an operation target mechanism to perform an operation displacement. The drive mechanism is dynamically connected to the drive mechanism via a buffering support means, and the buffering support means is configured to support in a buffering direction in the same direction as the direction of the driving force of the linear drive mechanism. And a restraining / releasing means for operating the force. When the mechanism to be actuated is operated, the restraining / releasing means for operating the driving force is operated to restrain the buffering means in the operating direction of the driving force. It is characterized in that it is configured to release and buffer the operation target mechanism to the initial state. In the above-described configuration, the shock-absorbing support means is a gas spring having a cylinder, a rod provided in the cylinder so as to be able to advance and retreat, and a means for restraining / releasing the movement of the rod. And a starting shaft that expands and contracts by a motor, and connects the distal end of the starting shaft to the mechanism to be actuated, while connecting the main body and the rod distal end side of the gas spring via a connecting means. It is characterized in that the connecting means is movably supported on a guide member provided in the same direction as the direction of action of the driving force. In addition, the
The shock-absorbing support means is provided on the cylinder and the cylinder so that it can advance and retreat.
Constrain / unconstrain the staking rod and the movement of this rod
Means, and the linear drive device
The structure consists of a main unit with a built-in motor,
A starting shaft that moves.
While connecting the main body and gas spring
The rod is connected to the cylinder via the connecting means.
The tip side is configured to be attached to the operation target mechanism, and the connection
Means on a guide member provided in the same direction as the direction of action of the driving force.
In addition, it is configured to be movably supported.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a linear drive mechanism provided with an emergency release means according to the present invention will be described with reference to the attached drawings, showing one embodiment. FIG. 1 shows a floor elevating mechanism 1 in a bed, which is a mechanism to be actuated, to which a linear drive mechanism having an emergency release means is applied. The floor lifting mechanism 1 has high-low links 3 at both ends of the bed frame 2.
It has an L-shaped long arm and short arm 3a, 3b,
a is rotatably connected to a base frame (not shown), and the bed frame 2 is supported by short arms 3b. The bed frame 2 is provided with a linear drive mechanism 5 via a gas spring 4 as a buffering support means. This linear drive mechanism 5
Has a main body 6 containing a motor (not shown) and a gear mechanism (not shown), and a starting shaft 7 which is extended and contracted by the motor. The linear drive mechanism 5 has the distal end of the starting shaft 7 connected to the short arm 3 b of one of the high-low links 3. The main body 6 is connected to the gas spring 4 attached to one end of the bed frame 2. is there.

The gas spring 4 is composed of a cylinder 4a and a rod 4b which is provided on the cylinder 4a so as to be able to advance and retreat. That is, the gas spring 4 has a partition (not shown) movably provided in the cylinder 4a to fill a high-pressure gas at the end of the cylinder 4a to form a gas chamber, and the oil is separated from the partition by the partition. Is enclosed via a partition to form an oil chamber, and a rod 4b is mounted in this oil chamber so as to be able to advance and retreat via a piston. The piston divides the oil chamber into two parts, and the piston divides the oil chamber into two parts. An oil flow path communicating with the oil flow path is formed, and an on-off valve for opening and closing the flow path is provided in the oil flow path. An operating shaft (not shown) for opening and closing the on-off valve is axially movable in the rod 4b. In addition to the provision, the tip of the operation shaft is projected from the rod 4b. By pressing the operating shaft, the on-off valve is operated to open the oil flow path, so that the piston can be moved in the oil chamber,
The rod 4b is configured to extend and retract with respect to the cylinder 4a, and has a function of opening the operating shaft, shutting off the oil flow path by an on-off valve, restraining the piston in the oil chamber, and placing the rod 4b in a restrained state. .

In the gas spring 4 having such a configuration,
The proximal end of the cylinder 4a is fixed to one end of the bed frame 2, while the distal end of the rod 4b is fixed to the main body 6 of the linear drive mechanism 5 via a fitting 8 which is a connecting means. In the receiving fitting 8, a pressing operation means (not shown) for pressing the operation shaft is arranged close to an operation shaft for projecting from the rod 4b and for restricting / releasing the rod 4b.

As shown in FIG. 2, the receiving member 8 is movably supported by a rolling member 10 on a guide member 9 provided along the longitudinal direction of the bed frame 2. Further, a support structure of the receiving fitting 11 as shown in FIG. 3 is also possible. That is, the receiving metal fitting 11 is configured to be able to move along the guide rod 12 via a sliding member (not shown) by bridging the pair of guide rods 12 provided in the longitudinal direction of the bed frame 2.

The linear drive mechanism 5 provided with the emergency release means according to the present invention is configured as described above. Next, the operation thereof will be described. When the linear drive mechanism 5 is activated to extend the starting shaft 7, the main body 6 of the linear drive mechanism 5
Since the short arm 3b connected to the tip of the starting shaft 7 is pressed rightward in the drawing because the rod 4b of the gas spring 4 is in a restrained state via the receiving fitting 8, the high-low link 3 is displaced, and the bed frame 2 And the floor can be adjusted and supported at a desired height (see FIG. 4).

In the event of a power failure or emergency, the linear drive mechanism 5 stops, and the floor is restrained at its height and cannot be moved. Then, when the operating means arranged on the receiving fitting 8 presses the operating shaft projecting from the rod 4b of the gas spring 4, the rod 4b becomes free, and the force from the main body 6 of the linear drive mechanism 5 is applied to the rod 4b. In addition, the rod 4b retreats in a cushioning manner toward the cylinder 4a. Then, the high-low link 3 is rotationally displaced so as to return to the initial position, and the floor supported by the bed frame 2 descends at a suppressed speed and can return to the original height (see FIG. 5). ). When the emergency state returns to normal, in order to raise and lower the floor again, the operating shaft of the rod 4b of the gas spring 4 is pressed by the operating means of the receiving bracket 8, and the rod 4b is set in the free state. The linear drive mechanism 5 is activated in the opposite direction to the operation of raising the floor, and the activation shaft 7 is retracted toward the main body 6.

As described above, the linear drive mechanism provided with the emergency release means according to the present invention has been described with reference to one embodiment.
The connection structure between the gas spring 4, the receiving member 8, and the linear drive mechanism 5 may be a structure as shown in FIG.
In such a structure, the cylinder 4a of the gas spring 4 is attached to the receiving fitting 8 side, and the tip of the rod 4b is attached to one end of the bed frame 2, and the rod 4b projecting from the tip of the rod 4b is restrained / restricted. A pressing operation means (not shown) for pressing the operation shaft 13 is disposed near the one end of the bed frame 2 on the operation shaft 13 for releasing. Further, in the above-described embodiment, the linear drive mechanism including the emergency release means is described as being applied to the floor elevating mechanism in the bed. However, the linear drive mechanism may include a back raising mechanism and a leg raising mechanism in the bed. It can also be applied as a power source in.

[0012]

As described above, according to the present invention, when a power failure occurs,
Even in an emergency, the floor can be quickly lowered at a suppressed speed, which is an indispensable function of the electric type and has an effect of further improving handling.

[0013]

[Brief description of the drawings]

FIG. 1 is a side elevational view of an essential part showing an embodiment of a bed floor raising / lowering mechanism to which a linear drive mechanism provided with an emergency release means according to the present invention is applied.

FIG. 2 is a schematic plan view showing a connection configuration of a linear drive mechanism and an emergency release unit shown in FIG. 1;

FIG. 3 is a schematic plan view showing another example of the connection configuration between the linear drive mechanism and the emergency release unit shown in FIG. 1;

FIG. 4 is an explanatory side view of a main part showing a state in which a linear drive mechanism provided with an emergency release means according to the present invention is activated, a floor lifting mechanism is operated, and a bed frame is raised.

FIG. 5 is an explanatory side view of a main part showing a state where the bed frame is returned by operating the emergency release means according to the present invention.

FIG. 6 is an explanatory perspective view of a main part showing another example of the mounting configuration of the emergency release means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor raising / lowering mechanism 2 Bed frame 3 Hi-low link 3a Long arm 3b Short arm 4 Gas spring 4a Cylinder 4b Rod 5 Linear drive mechanism 6 Main body 7 Starting shaft 8,11 Receiving metal fitting 9 Guide member 10 Rolling member 12 Guide rod 13 Operation axis

Claims (3)

(57) [Claims] 1. A linear drive mechanism for applying a driving force in a linear direction to an operation target mechanism and displacing the operation target mechanism, wherein the operation target mechanism and the linear drive mechanism are motively connected via a buffering support means. The shock-absorbing support means is configured to shock-absorb in the same direction as the drive force acting direction of the linear drive mechanism, and is provided with restraint / restraint release means for the drive force action direction. When the operation is performed, the restraint in the direction of action of the drive force is released by operating the restraint / restraint release means in the direction of action of the drive force, and the mechanism to be actuated is returned to the initial state in a buffered manner by the restraint of the buffering means in the direction of action of the drive force. A linear drive mechanism provided with an emergency release means. 2. The cushioning support means is a gas spring having a cylinder, a rod provided on the cylinder so as to be able to move forward and backward, and a means for restraining / releasing the movement of the rod. A body with a built-in motor,
A starting shaft that is telescopically operated by a motor, and a tip of the starting shaft is connected to the operation target mechanism, while the main body and a rod tip side of the gas spring are connected via connecting means; A linear drive mechanism provided with emergency release means according to claim 1, characterized in that it is movably supported on a guide member provided in the same direction as the direction of action of the driving force. 3. The cushioning support means includes a cylinder and a cylinder.
A rod provided on the Linda so that it can advance and retreat, and the operation of this rod
Gas spring having means for restraining / unrestraining
The linear drive mechanism includes a main body having a built-in motor,
A starting shaft that is telescopically operated by a motor.
While connecting the tip of a shaft to the mechanism to be actuated,
And the cylinder of the gas spring via the connecting means.
And attach the rod end to the mechanism to be actuated.
The connecting means is in the same direction as the direction of action of the driving force.
On the guide member provided in the direction
A linear drive mechanism provided with the emergency release means according to claim 1 .