JPH0567294B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an interlocking operation mechanism for casters in a mobile supine table such as a bed or a patient carrier.

(Prior Art) In mobile supine tables for transferring patients, such as ICU beds, recovery beds, or transport vehicles,
In order to ensure smooth running, casters with good running performance are installed at the four corners, and these are operated simultaneously by an interlocking operation mechanism to control running and fixing, for example, the state where the vehicle can run straight and change direction, and where it can only run straight. The vehicle can be set in a state in which the vehicle can run or in a state in which it is not possible to run.

As such an interlocking operation mechanism, there is a conventional one shown in FIG. 5, for example. This mechanism is suitable for supine table a
Mounting cylinders c constructed at the four corners of the base frame b of
A support shaft f that rotatably supports a wheel support frame e of a caster d having a built-in locking mechanism is fitted to and supported by the support shaft f, and the left and right shafts forming a pair in the width direction on the head side and foot side of the base frame b, respectively, are fitted and supported. An interlocking operating shaft g that operates these lock mechanisms is located between the casters d.
The interlocking operation shafts g on the head side and the foot side can be interlocked by an interlocking link mechanism consisting of an interlocking arm h and an interlocking link i, and an operation pedal j is provided at a suitable position on the interlocking operation shaft g. It consists of

(Problem to be Solved by the Invention) In the conventional interlocking operation mechanism described above, the operation pedal j is located at a relatively deep position to prevent the foot from getting stuck while driving, so it is difficult to operate. If the height of the floor part k supported on the base frame b is low, the operation must be performed in an unstable state.

The present invention aims to solve the above problems.

(Means for Solving the Problems) Means for solving the above-mentioned problems will be explained with reference to drawings corresponding to embodiments.The interlocking operation mechanism of the casters in the movable supine table of the present invention is as follows.
A floor part 2 is supported above the base frame 1 so as to be movable up and down, and casters 4 are provided on the left and right sides of the head side and the foot side of the base frame 1, respectively, for operating a built-in locking mechanism with an interlocking operation shaft 3. In a movable supine table in which these interlocking operation shafts 3 are operated by an interlocking mechanism consisting of an interlocking arm 17 and an interlocking link 18, the operating lever 20 is rotated on the top of the board 19 on the head side or foot side of the floor section 2. The operating lever 21 is rotatably provided on the base frame 1, and these levers 20 and 21 are connected via a drive rod 22 that is telescopic and capable of transmitting rotational force, and the interlocking mechanism The actuating portion 25 and the actuating lever 21 are connected via an actuating link 26.

In the above configuration, the operating lever 20 and the operating lever 21 can be configured to be tiltable. Further, the actuating portion can be configured by extending the interlocking link.

(Function) When the operating lever 20 is rotated, its rotational force is transmitted to the operating lever 21 via the drive rod 22, and the operating lever 21 is rotated. The rotation of the actuation lever 21 causes the actuation link 26 to actuate the interlocking mechanism to rotate the interlocking operation shafts 3 on the head and foot sides of the base frame 1. In this way, the board 1 on the head side or foot side of the floor part 2
A locking mechanism built into the caster 4 is actuated by an operation lever 20 provided on the upper part of the caster 9, and a switching operation can be performed between a state in which the vehicle can travel and a state in which it cannot travel. When the floor section 2 is raised and lowered relative to the base frame 1, the drive rod 22 expands and contracts accordingly, and rotational force is transmitted even in this state. Therefore, the locking mechanism of the caster 4 can be operated regardless of the height of the floor 2.

The elevating mechanism for the floor section 2 can be configured as appropriate, but in the case of applying an elevating mechanism in which the floor section 2 shifts laterally with respect to the base frame 1 when ascending and descending, the operation lever 20 and the Lever 2
If 1 is made tiltable, there will be no problem in operation.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

1 and 2 schematically represent the overall structure of a supine table to which the present invention is applied, and in these figures, reference numeral 1 denotes a base frame, and 2 denotes a floor supported above the base frame so as to be movable up and down. Department. In these figures, illustration of the elevating mechanism is omitted, and an appropriate mechanism can be applied to the elevating mechanism itself.
Therefore, on the left and right sides of the head and foot sides of the base frame 1, a built-in locking mechanism is installed on the interlocking operation shaft 3.
It is equipped with casters 4 that can be operated by. As the caster 4, for example, one disclosed in Japanese Patent Publication No. 50-7336 can be applied. That is, FIG. 4 shows such a caster 4, in which a wheel support frame 6 supporting a wheel 5 is rotatably fixed to the lower side of a support shaft 7, and a brake piece 8 is attached to the wheel support frame 6 in a vertically movable manner. A locking member 10 for pressing the upper side of the brake piece 8 is provided at the lower end of an operating rod 9 which is freely fixed and movable up and down within the support shaft 7. Further, the operating rod 9 is urged upward by a spring 11, and a cam 12 for moving it downward is provided on the support shaft 7, and this cam 12 is rotated by a cam operating shaft 13 that crosses the support shaft 7. The configuration is such that the actuating rod 9 is moved by moving the actuating rod 9. The actuating rod 9 moves the lock member 10 to a first position where it presses the brake piece 8, a second position where it abuts the upper side of the wheel support frame 6, and a free third position between these positions. The structure is such that it is held in this position. The first position corresponds to a state where the vehicle cannot travel, the second position corresponds to a state where only straight travel is possible, and the third position corresponds to a state where both straight travel and direction changes are possible. For this reason, engaging portions 14 and 15 are formed on the upper side of the brake piece 8 and the lower side of the lock member 10, and on the upper side of the lock member 10 and the upper side of the wheel support frame 6, respectively, to prevent movement in the turning direction. There is.

The caster 4 having the above configuration has the base frame 1
The cam operating shaft 13 is fitted into and supported by mounting cylinders 16 formed at the four corners of the mounting cylinder 16, and the cam operating shaft 13 is made to protrude in the transverse direction of the mounting cylinder 16, and this cam operating shaft 13 itself is configured as the interlocking operation shaft 3. Alternatively, by connecting the interlocking operating shaft 3 to the cam operating shaft 13, the operating rod 9 can be operated from the outside. And these interlocking operation shafts 3 have interlocking arms 1.
7 are provided protrudingly, and these interlocking arms 17 are connected by an interlocking link 18 to form an interlocking mechanism.

Therefore, the board 19 on the head side or foot side of the floor part 2
An operating lever 20 is rotatably provided on the upper part of the base frame 1, and an operating lever 21 is rotatably provided on the base frame 1. are connected. In the figure, the drive rod 22 is connected to the outer square pipe 23 on the operating lever 20 side and the operating lever 21.
It consists of an inner square pipe 24 on the side. One end of the interlocking link 18 projects toward the actuating lever 21, and this protruding portion constitutes an actuating portion 25. The actuating portion 25 and the actuating lever 21 are connected via an actuating link 26. In addition,
The actuating portion 25 can be constructed by, for example, having an actuating arm protruding directly from the interlocking operation shaft 3.

In the above configuration, the lock state shown in FIG.
That is, when the operating lever 20 is rotated from the state in which the lock member 10 is in the first position described above to the state shown in FIG.
also rotates in the same direction to pull the actuating link 26.
Due to this movement of the operating link 26, the interlocking link 18
is also pulled, both interlocking operation shafts 3 are rotated by the interlocking arm 17, operating the cam 12, the locking member 10 reaches the third position, and the wheels 5 of the caster 4 are in a free state. In other words, the vehicle is in a state where it can both drive straight and change direction. In addition, the operating lever 20
If the locking member 10 is placed in a position intermediate between FIG. 1 and FIG. 2, the locking member 10 reaches the third position, and the wheels 5 of the caster 4 are in a state in which only straight forward travel is possible.

FIG. 3 shows an example of an elevating mechanism. Although some parts of the elevating mechanism are omitted, the base frame 1 and the floor 2 are connected by a rotation support arm 27 constituting a parallel link mechanism. The rotary support arm 27 is rotated by driving a drive arm 29 protruding from a rotary rod 28 that connects the rotary support arms 27 on both sides with a telescopic drive rod 30 such as a screw shaft type. The floor part 2 is moved up and down by the user, and the floor part 2 shifts in the lateral direction with respect to the base frame 1 when going up and down. When such a lifting mechanism is used, the operating lever 20 and the operating lever 21 are configured to be tiltable by providing play at their respective installation locations or by supporting them with spherical bearings.

However, when the floor part 2 shifts to the right with respect to the base frame 1 as shown in FIG.
2, so there will be no inconvenience caused by misalignment. Therefore, regardless of whether the floor section 2 is in a high or low state, the operating lever 20 can be rotated to make the caster 4 immobile as shown in FIG. It can be made movable as shown.

The caster 4 described above has a built-in locking mechanism that can be moved to three holding positions in order to be able to operate the caster 4 in three states: a state where it cannot run, a state where it can only run straight, and a state where it can run straight and change direction. However, it goes without saying that the caster 4 may be inoperable between two states: a state where the vehicle cannot travel and a state where it can travel straight and change direction.

(Effects of the Invention) As described above, the present invention provides a movable supine table in which the floor part can be raised and lowered, and includes casters with a built-in locking mechanism provided on the left and right sides of the base frame on the head and foot sides respectively. The operating lever is located on the top of the board on the head or foot side of the floor, making it very easy to operate and making it extremely easy to move the mobile supine table and fix it in the moving position. . Further, the present invention has the advantage that an appropriate mechanism for raising and lowering the floor can be applied.

[Brief explanation of the drawing]

1 to 4 correspond to an embodiment of the present invention, and FIGS. 1a and 1b are an explanatory perspective view and an enlarged perspective view of essential parts, respectively, in a locked state, and FIG. 2a and FIG. , b are an explanatory perspective view and an enlarged perspective view of essential parts, respectively, in the unlocked state. FIGS. 3a and 3b are explanatory side views of the floor lowered state and the floor raised state, respectively, showing the movement of the floor raising and lowering mechanism. FIG. 4 is an explanatory sectional view of the caster. FIG. 5 is an explanatory diagram of a conventional example. Code, 1...Base frame, 2...Floor, 3...
...Interlocking operation axis, 4...Casters, 5...Wheels,
6... Wheel support frame, 7... Support shaft, 8... Brake piece, 9... Operating rod, 10... Lock member, 11
... Spring, 12 ... Cam, 13 ... Cam operating shaft,
14, 15, engaging portion, 16... mounting cylinder, 17...
... Interlocking arm, 18 ... Interlocking link, 19 ... Board, 20 ... Operation lever, 21 ... Operation lever,
22... Drive rod, 23... Outer corner pipe, 24...
...Inner corner pipe, 25... Actuation part, 26... Actuation link, 27... Rotating support arm, 28... Rotating rod,
29... Drive arm, 30... Telescopic drive rod.

Claims (1)

[Scope of Claims] 1. A caster that supports a floor part above a base frame so as to be able to rise and fall, and that operates built-in locking mechanisms using interlocking operation shafts on the left and right sides of the head and foot sides of the base frame, respectively. In a movable supine table in which these interlocking operation shafts are operated by an interlocking mechanism consisting of an interlocking arm and an interlocking link, an operating lever is rotatably provided on the top of a board on the head side or foot side of the floor. In addition, operating levers are rotatably provided on the base frame, and these levers are connected via a drive rod that is extendable and capable of freely transmitting rotational force, and the operating portion configured in the interlocking mechanism and the operating lever are actuated. Interlocking operation mechanism 2 of casters in a movable supine table, characterized in that they are connected via a link.A caster in a movable supine table, characterized in that the operating lever and the operating lever according to claim 1 are configured to be tiltable. Interlocking operation mechanism 3 An interlocking operation mechanism for casters in a movable supine table, characterized in that the actuating section is constructed by extending an interlocking link.