JPH0822646B2 - Electric / manual interlocking lock mechanism for casters in beds, etc. and its operation control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric / manual interlocking lock mechanism for casters in a bed or the like, which has improved operability, and a method of controlling the operation thereof.

[0002]

2. Description of the Related Art For example, many casters for movement, which are attached to the legs of a bed or the like, have a lock mechanism. That is, the lock mechanism includes, for example, a braking piece that abuts on the wheel to lock the wheel, an operating rod that presses the braking piece against the wheel, and a cam member that presses the operating rod. There is a structure in which a stepping operation means is attached to the rotating shaft of the cam member.

[0003]

However, according to the above-mentioned stepping operation means, when the actuating rod is operated to lock and unlock the wheels, the operation of the stepping operation means provided on each caster is prevented. It is necessary to perform stepping operation, lifting operation in reverse, and to provide stepping pedals for locking and unlocking the wheels respectively. On the contrary, the lifting operation requires a large force and becomes a burden, and if the number of operation pedals is increased, it must be taken into consideration enough to set the operation pedal to a position where it is easy to operate. The present invention has been made in view of the above-described problems, and enables wheels to be locked and unlocked by electric power, and further, electric / manual operation of casters in a bed or the like that can be manually operated even during a power failure. An object is to provide a dual-use interlocking lock mechanism.

[0004]

[Means for Solving the Problems] [Means for Solving the Problems]
For this reason, the present invention provides a cap such as a bed equipped with a lock mechanism.
In this case, the lock mechanism is a power for locking operation.
Has a rotating shaft for transmitting the
Attach these operating arms so that they can be linked via the interlocking rod.
The caster is operated in a stepped-up manner on the rotary shaft of one of the casters.
Working means is attached, and a projection piece is projected on the interlocking rod.
This projection piece is operated by the operation of the stepping operation means.
Electric drive is provided via a dynamic disconnecting means that allows the operation of the interlocking rod.
It is characterized in that the moving mechanism is connected. In the above-mentioned configuration, the electric drive mechanism has a motor as a drive source, a screw shaft connected to the motor, and a locking frame that can move back and forth on the screw shaft. The structure which forms a permissible movement space part and is provided with a locking part which abuts on the projection piece.
Electric / manual interlocking lock mechanism for casters in the beds etc. described. In addition, the caster can be operated both electrically and manually.
In the dynamic lock mechanism, the electric drive mechanism is activated, the locking frame is moved, the operating arm is rotated through the projection piece and the interlocking rod, and the lock mechanism is locked or unlocked. Detect it and then rotate the motor in the opposite direction to the direction of rotation when locking or unlocking,
It is characterized in that the locking frame is moved so that the projection piece is located at a substantially intermediate portion of the allowable movement space part of the locking frame.

[0005]

[Function] When the electric drive mechanism is activated to lock the caster, the locking frame moves on the screw shaft and extends, and the locking portion of the locking frame comes into contact with the protruding piece, and the interlocking rod is pressed. , The operating arm rotates. As a result, the rotation shaft of the lock mechanism rotates, and the lock mechanism is locked. On this occasion,
When the lock of the lock mechanism is detected by an appropriate detecting means, the motor rotates in the direction opposite to the rotation direction at the time of locking, the locking frame moves on the screw shaft and recedes, and the protruding piece engages. It reaches almost the middle part of the allowable movement space part of the stop frame. When the protruding piece reaches such a position, the interlocking rod and the operating arm are in a state of being mechanically disconnected from the electric drive mechanism, so that the stepping-on operation means is electrically operated when there is a power failure or in a place where there is no power supply equipment. It can be operated without any trouble without any load from the drive mechanism.

Further, in order to unlock, the motor is rotated in the opposite direction to the rotation direction at the time of the lock operation, and the projecting piece is pulled in by the locking portion of the locking frame. And the rotation shaft of the lock mechanism is rotated. When the unlocking is detected by an appropriate detecting means, the motor rotates in the opposite direction, the locking frame moves on the screw shaft and extends, and the protruding piece substantially extends in the allowable movement space portion of the locking frame. It reaches the middle part and is in a state of being mechanically disconnected.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric / manual interlocking lock mechanism for casters in a bed or the like according to the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 indicates a base frame of the bed, and casters 2 are attached to the squares of the base frame 1. The caster 2 is provided with an electric / manual interlocking lock mechanism 3. The electric / manual interlocking lock mechanism 3 is a lock mechanism (not shown) having a known structure built in the caster 2 and this lock. It is composed of an electric drive mechanism 4 for operating the mechanism. The lock mechanism has a rotating shaft 5 for transmitting power for performing a locking operation, and an operating arm 6 is attached to the rotating shaft 5 so that the operating arms 6 can be interlocked via an interlocking rod 7. Then, the stepping operation means 8 is attached to the rotary shaft 5 of one of the casters 2, and the projecting piece 9 is projected on the interlocking rod 7, and the projecting piece 9 is connected by the operation of the stepping operation means 8.
Via a dynamic connecting / disconnecting means (described later) that allows the operation of the moving rod 7.
The electric drive mechanism 4 is connected.

As shown in FIGS. 2 and 3, the electric drive mechanism 4 has a motor 10 as a drive source, a screw shaft 11 connected to the motor 10, and a female screw (not shown) which moves forward and backward on the screw shaft 11. Power interruptions with
A locking frame 12 which is a means, and in which the locking frame 12 is formed with an allowable movement space portion 13 for the projection piece 9 and a locking portion 14 which comes into contact with the projection piece 9. is there.

In the electric / manual interlocking lock mechanism 3 as described above, a control means for executing the following operation procedure is provided.
(Not shown) is provided. That is, the electric drive mechanism 4 is activated and the locking frame 12 is moved to move the projection piece 9 and the interlocking rod 7.
The actuating arm 6 is rotated through the lock mechanism to lock or unlock the lock mechanism, and the lock mechanism is locked or unlocked by an appropriate detecting means.
Detecting the lock release, and then rotating the motor 10 in the opposite direction to the rotation direction at the time of locking or releasing the lock,
The operation procedure of moving the locking frame 12 so that the protruding piece 9 is located at a substantially intermediate portion of the allowable movement space 13 of the locking frame 12 is executed.

The electric / manual interlocking lock mechanism 3 according to the present invention is constructed as described above. Next, its operation will be described. When the electric drive mechanism 4 is activated to lock the caster 2, the locking frame 12 moves on the screw shaft 11 and extends (see FIG. 4 a), and the locking piece 14 of the locking frame 12 is attached to the projecting piece 9. Abut, the interlocking rod 7 is pressed, and the operating arm 6 rotates (see FIG. 4b). As a result, the rotation shaft 5 of the lock mechanism is rotated, and the lock mechanism is locked. At this time, when the lock of the lock mechanism is detected by an appropriate detection means, the motor 10 rotates in the opposite direction to the rotation direction at the time of locking, and the locking frame 12 moves on the screw shaft 11 and retracts. Then, the protruding piece 9 reaches a substantially middle portion of the allowable movement space portion 13 of the locking frame 12 (see FIG. 4c). When the projecting piece 9 reaches such a position, the interlocking rod 7 and the operating arm 6 are in a state of being mechanically disconnected from the electric drive mechanism 4, and therefore, when the power is cut or a place without a power supply facility is depressed. The operation means 8 can be operated without any trouble in the absence of load by the electric drive mechanism 4 (see FIGS. 5a and 5b).

To release the lock, the motor 10
Is rotated in the direction opposite to the rotation direction at the time of the lock operation, the projection piece 9 is pulled in by the locking portion 14 of the locking frame 12, the interlocking rod 7 and the operating arm 6 are interlocked, and the locking mechanism is rotated. The moving shaft 5 is rotated. When unlocking is detected by an appropriate detecting means, the motor 10 rotates in the opposite direction, the locking frame 12 moves on the screw shaft 11 and extends, and the projecting piece 9 allows the locking frame 12 to move. Moving space 13
It reaches the approximate middle part of the, and is in a state of being mechanically disconnected.

As described above, the lock mechanism of the caster 2 can be quickly locked and unlocked by the electric drive mechanism 4, labor is reduced, and the lock mechanism is locked or unlocked. , Electric drive mechanism 4
By mechanically disconnecting the lock mechanism from the lock mechanism, the lock mechanism of the caster 2 can be easily operated manually even during a power failure, so that there is no problem in an emergency.

[0013]

As described above, according to the present invention, the casters can be locked and unlocked electrically, so that the operability is significantly improved and the manual operation is possible even during a power failure. However, there is a great advantage that it can be fully supported.

[0014]

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a base frame of a bed or the like provided with an electric / manual interlocking lock mechanism for casters according to the present invention.

FIG. 2 is an enlarged side view of the essential parts of the electric / manual interlocking lock mechanism of the caster shown in FIG.

FIG. 3 is an enlarged side view of a main part of the electric drive mechanism shown in FIG.

FIG. 4A is an operation explanatory view of the electric drive mechanism of the electric / manual interlocking lock mechanism of the caster according to the present invention.

FIG. 4b is an operation explanatory diagram of the electric / manual interlocking lock mechanism of the caster according to the present invention.

FIG. 4c is an operation explanatory view of the electric drive mechanism of the electric / manual interlocking lock mechanism of the caster according to the present invention.

FIG. 5a is an explanatory diagram of an operation when the stepping operation device is operated in the electric / manual interlocking lock mechanism of the caster according to the present invention.

FIG. 5b is an explanatory view of the operation when the stepping operation device is operated in the electric / manual interlocking lock mechanism of the caster according to the present invention.

[Explanation of symbols]

1 Base frame 2 Casters 3 Electric / manual interlocking lock mechanism 4 Electric drive mechanism 5 Rotating shaft 6 Actuating arm 7 Interlocking rod 8 Stepping type operating means 9 Projection piece 10 Motor 11 Screw shaft 12 Locking frame 13 Allowable moving space part 14 Locking part

Claims (3)

[Claims] 1. A caster such as a bed having a lock mechanism, wherein the lock mechanism has a rotation shaft for transmitting power for performing a locking operation, and the operation arm is attached to the rotation shaft. the interlocked linked structure through the associated rod, either fitted with a depression-type operating means to the rotation axis of the caster, on the projecting piece while projecting the projecting piece to the associated rod, the depression type operation means By operating
Electric drive through a dynamic disconnecting means that allows the movement of the moving rod
An electric / manual interlocking lock mechanism for casters in beds etc. characterized by connecting the mechanism. 2. The electric drive mechanism includes a motor as a drive source, a screw shaft connected to the motor, and a locking frame that can move back and forth on the screw shaft, and the locking frame has a protruding piece. 2. The interlocking mechanism for electric / manual combination of casters in a bed or the like according to claim 1, wherein the allowable movement space portion is formed and a locking portion that abuts the projection piece is provided. 3. A combined electric / manual interlocking rod of the caster.
In the lock mechanism, start the electric drive mechanism to open the locking frame.
Move it and rotate the operating arm through the protruding piece and the interlocking rod to
Lock or unlock the lock mechanism,
Detects unlocking, and then locks or locks
Rotate the motor in the opposite direction of the
The piece should be positioned approximately in the middle of the allowable movement space of the locking frame.
In beds etc. characterized by moving the locking frame
Control of the combined electric / manual interlocking lock mechanism of the caster
Method.