JPH08282950A - Braking device for lift device - Google Patents

Abstract

PURPOSE: To provide a braking device which stably controls lifting of a lift member of a lift device by a simple operation further to surely hold the member stopped by small operating force. CONSTITUTION: A friction braking unit 2 and a meshing braking unit 4 are movably mounted in a lift member 12 and respectively pressed to adjacently provided friction fixed member 1 and meshing fixed member 3 through elastic materials 5, 6. When an operating lever 8, swivelably held to the lift member 12, is operated in a lift direction of the lift member 12, the braking unit 4 is separated respectively from the fixed member 3 against the elastic materials 5, 6, to release braking force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for an elevating device which is manually moved up and down.

[0002]

2. Description of the Related Art A friction brake is used to adjust the speed or to stop at an arbitrary position with an elevating device that is manually moved up and down, but it requires a slight adjustment in operation and is large in order to obtain a strong braking force. Operation was required.

[0003]

In the above case, when the release lever of the brake is operated, the brake is released and the elevating member moves up and down. However, when the load is balanced with a spring or a weight, there is a subtle imbalance in the balance. If not operated, the lifting member may run away. Further, a friction brake requires a large operating force to obtain a strong braking force, but a small meshing force is sufficient for a meshing brake. If there is a large speed difference, meshing is impossible. Therefore, the present invention solves the above problem.

[0004]

In order to achieve the above object, the present invention is provided with a friction fixing member, an elevating member which can be moved up and down along the friction fixing member, and a friction braking body which is vertically moved integrally with the elevating member. A braking force is generated by pressing the friction braking member against the friction fixing member with an elastic material or the like. Further, along with the friction fixing member, a mesh fixing member having a large number of concave portions and a mesh braking body fitted in the concave portions by an elastic material or the like are elastically mounted on the friction braking body, and further, An operating lever for pulling the meshing braking member and the elastic fixing member against the friction fixing member and the meshing fixing member is attached to the elevating member. The operating direction of the operating lever is parallel to the vertical direction of the lifting member.

[0005]

[Operation] When the raising / lowering member is raised, if the operating lever is pushed up, the braking force is released and the raising / lowering member is raised by the force of the operating force and the balance member. If the force of the balance member is large, the lifting member is accelerated, but the operating lever is also accelerated in the upward direction accordingly, so that the force pushing up the operating lever is diminished and the operating lever returns. Is pressed against the friction fixing member to exert a braking force, and the rising speed becomes slow. Therefore, the runaway can be stopped. When lowering the elevating member, the operating lever is pushed down to release the braking force, and the elevating member is lowered by the operating force.
When the force of the balance member is small, the lifting member is accelerated, but the operating lever is also accelerated in the descending direction accordingly, the force of pushing down the operating lever is attenuated, the operating lever returns, and the braking force also acts. You can stop the runaway. When the operating lever is fully returned, the elastic braking material engages the braking body,
It fits into the concave portion of the meshing fixing member to reliably stop and hold the lifting member.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. 1, 2, and 3 show an embodiment of a braking device according to the present invention. This braking device includes a friction fixing member 1, a friction braking body 2 that is pressed against the friction fixing member 5 by the elastic material 5, the friction braking body 2, and an elastic material 6 into a meshing fixing member 3 having a large number of recesses 7. The meshing braking body 4 is pressed. When the mesh braking body is at the same position as the concave portion 7, it is fitted into the concave portion. Therefore, even if the pressing force of the elastic material 6 is small, a large braking force is generated, and the force for operating the operation lever against the elastic material 6 can be reduced. In the above braking body, the protruding guide roller 13 is slidably attached to the elevating member 12 which is guided by the guide rail 14 and moves up and down. Each fixing member is provided along the guide rail 14 in the vicinity of the elevating member. The operating lever 8 is swingably held by fulcrums 15 and 16 fixed to the elevating member 12,
2 ascending direction (indicated by arrow 18) or descending direction (arrow 1)
9)) (indicated by arrows 20 and 21, respectively)
As shown in FIG. 3, the brake body is separated from the fixing member against the elastic material via the lever 10 and the linear body 9 (indicating the operation in the upward direction), and is also moved up and down via the fulcrums 15 and 16. A force in an ascending direction or a descending direction is applied to the member 12. The spring constant of the elastic material 5 is made larger than the spring constant of the elastic material 6. By operating the operation lever 8, the mesh braking body 4 is
When the elastic member 6 is separated from the fixed member 3 against the elastic member 6 through the lever 10 and the linear member 9, and the operation lever is further operated, the elastic force of the elastic member 6 is repulsed. It becomes larger than the generated force, the friction braking body 2 is separated from the friction fixing member 1, and the braking force is released. The balance member 17 applies a lifting force to the lifting member 12 to assist the lifting of the lifting member 12, and a weight can be used via a coil spring, a gas spring, or a pulley. As the friction fixing material, you can use a rubber belt etc. to increase the frictional force, and for the meshing fixing material, you can make a hole in the square member to form a recess, or use a toothed belt, bushed chain, etc. You can also

[0007]

Since the present invention is laterally formed as described above, the following great effects can be obtained. Claim 1
According to the described braking device, the operation lever 8 is moved to the lifting member 12
By pushing in the same direction as the ascending / descending direction, the ascending / descending force can be applied to the ascending / descending member and the braking force can be released to easily ascend / descend the ascending / descending member. Moreover, the balance between the balance member 17 and the elevating / lowering member 12 is insufficient. Therefore, when the elevating / lowering member is accelerated, the operation lever 8 returns to increase the friction braking force to decelerate the elevating / lowering member, without requiring special adjustment. It is possible to stably move up and down by always following the speed at which the operation lever 8 is pushed. According to the braking device of claim 2, a large braking force can be obtained with a small operating force by fitting the meshing braking body 4 into the concave portion of the meshing fixing member 3. Since the meshing braking member 4 is sufficiently decelerated by the friction fixing member 3 and the friction fixing member 3 to press the meshing braking member 4 against the meshing fixing member 3, the meshing braking member 4 can be fitted smoothly and the impact is small.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view.

FIG. 3 is a vertical sectional view.

[Explanation of symbols]

 1, friction fixing member 2, friction braking member 3, mesh fixing member 4, mesh braking member 5, 6 elastic material 8, operating lever 10, lever 12, lifting member 15 16 fulcrum 17, balancing member

Claims (2)

[Claims] 1. A friction fixing member (1) is provided, and a friction braking member (2) is movably attached to an elevating member (12) that moves up and down in the vicinity of the friction fixing member (1) via an elastic material (5). Is pressed against the friction fixing member 1 and the operating lever 8 held by the elevating member 12 so as to be swingable in the ascending / descending direction is pushed in the ascending / descending direction so that the friction braking body 2 is resistant to the elastic material 5. The braking device for the lifting device is characterized in that the lifting device 12 is pulled apart from the friction fixing member 1 and a lifting force is applied to the lifting member 12. 2. A friction fixing member (1) is provided with a mesh fixing member (3) having a large number of recesses (7), and a mesh braking member (4) is movably attached to the friction braking member (2) via an elastic material (6). The elastic braking member 6 is fitted into the recess 7 of the mesh fixing member 3 by the elastic member 6, and the spring constant of the elastic member 5 pressing the friction braking member is pressed against the engaging braking member. The braking device for an elevating device according to claim 1, wherein the spring constant of the elastic material 6 is made larger.