JPH0444461Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a central brake system, specifically a brake system suitable for swivel casters, and more specifically, a brake system suitable for swivel casters.
The present invention relates to a central braking device suitable for flexible casters that can collectively stop or release the drive of a plurality of flexible casters.

(Prior Art) Swivel casters are used in carts, moving heads, etc. for these purposes of movement. Flexible casters do not have a specific directionality, and the direction of movement is determined by the movement of the main body, such as a cart. That is, it is difficult to specify the direction of the caster when the vehicle is stopped. In particular, when a plurality of swivel casters, for example four, are attached to a truck or the like, the directions of each caster often vary when the vehicle is stopped. Therefore, as shown in FIG. 7, which is a perspective view of a conventional caster, the brake lever 43 is fixed not to the rotating shaft 42 side of the caster but to the wheel stay 41 side fixed to the wheel 44.
4. No matter which direction the wheel stay 41 faces, the brake can be activated and released by operating in the direction of the arrow.

(Problem to be solved by the invention) However, since the brake lever 43 rotates together with the wheels 44 and the wheel stays 41, each wheel 44
The direction of the brake lever 43 varies,
It is difficult to activate and release the brakes on each wheel 44 at once, and if you dare to activate them all at once, there is a problem that requires a complicated link mechanism, so a central braking system has not been used.

(Means for Solving the Problem) This invention includes a mounting surface, a plurality of main shafts protruding below the mounting surface, a wheel stay that is rotatable about the axial direction of the main shaft with respect to the main shaft, A wheel supported by a wheel stay, a brake lever that attaches and detaches the brake by coming into contact with and separating from each of two or more wheels, and is biased so that it does not come into contact with the wheel when not in operation, and each brake. An operating lever for bringing the lever into contact with each wheel and releasing the contact, one pulley and the other pulley that are installed facing each other on the same plane and can be moved close to each other and away from each other, and one end of the lever is A primary connecting means made of a deformable linear material that is attached to the other pulley, is rotated around the one pulley at the intermediate portion, and then extends in the direction of extension of the other pulley; a central brake lever mounted at the other end and selectively tensioning and relaxing the primary coupling means, and an intermediate section on a circumference provided concentrically with the circumference of one pulley or on the circumference of the other pulley; , or a secondary connecting means made of a deformable linear material that spans either of the circumferences provided concentrically with the circumference of the other pulley and whose ends are attached to different operating levers. Provides a central braking device with the following characteristics.

(e) Action When using the brake, operate the central brake lever and tension the primary connection means. Then, the primary coupling means is pulled, and the positions of one pulley and the other pulley become closer.

Then, the middle part spans the circumference that is concentric with the circumference of one pulley, or the circumference of the other pulley, or the circumference that is concentric with the circumference of the other pulley. The secondary coupling means attached to different operating levers are also tensioned, and the two
Next, the operator operates the operating lever attached to the end of the connecting means to bring the brake lever into contact with the wheel. Therefore, the brakes are applied to all the wheels that require brake operation at the same time, and the brakes are not applied to each wheel at the same time.

(Example) This invention will be explained with reference to FIG. 1 showing a partially enlarged view of an example of this invention, FIG. 2 showing a state of use, and FIG. 3 showing the principle of operation in a state of use.

1 is a moving bed. The main shaft 2 is vertically provided at the four corners of the mounting surface 17 of the moving bed 1. Main shaft 2
As shown in FIG. 1, a wheel stay 4 is attached to the lower end of the main shaft 1 through a bearing 3, centered on the axial direction of the main shaft 1. A wheel 5 is fixed to the tip of the wheel stay 4 so as to be rotatable about a shaft provided at the tip. The wheel 5 consists of a tire 6 and a wheel 7. These wheels 5, wheel stays 4, etc. form swivel casters A, B, C, and D, respectively. The casters are paired with caster A and caster D, and caster B and caster C. A brake lever drive device 9 is provided below each main shaft 2, which has a larger diameter than the main shaft 2, has a protrusion 8 on the outside, and has a cover on the outer periphery of the protrusion 8. In this embodiment, the brake lever drive device 9 has an operating lever 10 integrated with the protrusion 8 at the upper part.
The wheel stay 4 can be moved in the direction of the wheel stay 4 and in the opposite direction by rotation according to the multiple threads provided on the main shaft 2 with the main shaft 2 as the axis. The operating lever 10 is normally positioned by a biasing force such as a spring so that the brake lever drive device 9 does not fall.

11 is a brake lever. The brake lever 11 is pivotally supported at the upper part of the wheel stay 4 at approximately the center, and by moving around the shaft, one end comes into contact with the protrusion 8 of the brake lever drive device 9, and the other end comes into contact with a part of the wheel 5. It is possible to contact with. The brake lever 11 performs a braking action on the wheel 5 by bringing the other end into contact with the wheel 5, but normally, the brake lever 11 performs a braking action on the wheel 5 by the action of a spring (not shown) installed on the shaft portion that biases the brake lever in the non-abutting direction. Take a position where there is no contact.
The operating levers 10 of each swivel caster are connected by a connecting means as shown in FIG. 3, and are interlocked with the operation of the central brake lever 12.

That is, as shown in FIG. 2, a pulley 1 that can reciprocate on the same plane in the longitudinal direction of the movable bed is installed at the bottom of the movable bed 1, which does not pose an obstacle to the work.
3 and 14 are fixed facing each other. Pulley 13 is the third
As shown in the figure, the connecting means 1 is composed of a pulley having a double circumference, and the short radius of the pulley connects the operating levers 10 of the pair of swivel casters A and D.
Pulleys 15a, 1 for fixing 6a to the moving bed 1
5b. A connecting means 16b for connecting the operating levers 10 of the swivel casters B and C is attached to the circumference of the pulley 14 on the lower frame 1 of the moving bed 1.
A pulley 15 is attached to the pulley 15 so as to be slidable in the direction of the arrow shown in FIG.
c, 15d. Each connecting means is made of a wire in this embodiment, but any other material capable of pulling both pulleys 13 may be used, such as a wire, a string, or a belt. A connecting means 16c is provided between the center of the pulley 14 and the central brake lever 12 via the large radius circumference of the pulley 13.

Next, the effect will be explained. When the central brake lever 12 is actuated, each connecting means moves as shown by the arrow in FIG. 3, shortens the distance between the pulleys 13 and 14, and rotates each operating lever 10. Then,
The brake lever drive device 9 moves in the direction of the wheel stay 4. As a result, one end of the brake lever 11 contacts or strengthens the contact with the protrusion 8 of the brake lever drive device 9, the brake lever 11 rotates around the support shaft, and the other end contacts the wheel 5. The brakes can be applied without causing all four wheels to shift. When the central brake lever 12 is applied in the opposite direction, the operating lever 10 rotates in the opposite direction and the brake is released.

FIG. 4 is a diagram showing the operating principle of the second embodiment in use. In this embodiment, one end of the connecting means 16a is connected to the pulley 15b, and one end of the connecting means 16b is connected to the pulley 15b.
5c. Therefore, in this embodiment, by operating the central brake lever 12, the brakes provided only on the diagonal swivel casters A and C are activated and released.

FIG. 5 shows another embodiment in which a pair of casters A and D on the opposite side of the central brake lever 12 are operated. In this embodiment, the connecting means 16b connecting the casters B and C is not provided, and the pulley 14 is fixed to the lower frame 18. Therefore, by operating the central brake lever 12, the brakes provided only on casters A and D are activated and released.

In the embodiment shown in FIG. 6, a connecting means 16a for connecting casters A and D is not provided, and the pulley 13 is fixed to the lower frame 18. Therefore, by operating the central brake lever 12, the brakes provided only on casters B and C are activated and released.

(Effects of the invention) Therefore, in this invention, the brake levers provided for each of the plurality of wheels of the swivel caster can be operated centrally despite having a simple structure. To provide a brake device that can be easily operated all at once even when a plurality of brake devices are used. For example, in a mobile bed, it is possible to install it at the bottom of the bed where it does not get in the way during use.

[Brief explanation of the drawing]

Fig. 1 is a partially enlarged view of the embodiment of this invention, Fig. 2 is a usage state diagram, Fig. 3 is a diagram of the operating principle in the usage state, and Figs. 4, 5, and 6 are other embodiments. FIG. 7, which is a diagram of the operating principle in an example usage state, is a diagram of a conventional example. 2...Main shaft, 4...Wheel stay, 5...Wheel,
9... Brake lever drive device, 11... Brake lever, 12... Centralized brake lever, 13,
14... Pulley, 15, 16... Connection means, 17...
...Placement surface.

Claims (1)

[Scope of utility model registration request] A mounting surface, a plurality of main shafts protruding below the mounting surface, a wheel stay that is rotatable about the axial direction of the main shaft with respect to the main shaft, wheels supported by the wheel stays, and two or more wheels. The brake levers are energized so that the brakes are not in contact with the wheels when not in operation, and the brake levers are brought into contact with and released from the wheels by respectively touching and releasing the brakes. one pulley and the other pulley, which are arranged opposite to each other on the same plane and can be moved close to and apart from each other; one end is attached to the other pulley, and an intermediate portion of the one pulley A primary connecting means made of a deformable linear material that is passed around the circumference and extended in the direction of extension of the other pulley, and a primary connecting means that is attached to the other end of the primary connecting means and selected as the primary connecting means. A central brake lever providing tension and relaxation, with an intermediate section located on a circumference concentric with the circumference of one pulley; 1. A central braking device comprising a secondary connecting means made of a deformable linear material, which spans one of the circumferences of the central brake system, and whose ends are attached to different operating levers.