JPS6219656Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a braking device used for emergency stopping of a moving body guided by a rail, such as an elevator cab.

Figure 1 shows a conventional braking device of this type.
In the figure, 1 is a rail that guides the moving body 2, 3 is a brake member equipped with a braking member 3a on the surface facing the rail 1, and 4 is pressed by a pressure spring 5 supported by the moving body 2, and the roller 6 is Through the inclined surface 3b of the brake child 3
The pusher 7 is supported by the movable body 2 and is an operating spring that presses the brake 3 in the direction opposite to the moving direction of the movable body 2. Although not shown, the presser metal 4
is constructed so that it can only move in a direction perpendicular to the rail 1.

With the structure described above, when the movable body 2 is guided along the rail 1 and the operating spring 7 is actuated while descending as shown by the arrow A, the brake 3 is moved by the actuating spring 7 as shown by the arrow B. It moves in the opposite direction to the moving direction of the moving body 2. As a result, the brake 3 is pressed via the rollers 6 due to the wedge action with the pusher 4 pressed by the push spring 5, and the movable body 2 is braked by the frictional force generated between the rail 1 and the brake member 3a. Ru.

By the way, when braking is performed using the device configured as described above, the force applied from the push spring 5 to the inclined surface 3b of the brake element 3 is reduced as shown in FIG.
P ₁ , the reaction force from the rail 1 is F ₁ , the friction force that brakes the brake 3 is F ₂ , and the reaction force acting on the brake 3 from the moving body 2 is F ₃ , these forces are balanced, but , a clockwise rotation moment M ₁ is generated in the right brake element 3, and a counterclockwise rotation moment M ₂ is generated in the left brake element 3.

In the figure, |F ₁ |=F ₁ , |F ₂ |=F ₂ , |F ₃
|=F ₃ , |P ₁ |=P ₁ , F ₁ =P ₁ cosα, F ₃ =F ₂ −
P ₁ sinα, M ₁ = O ₁ O ₃ ×F ₃ + O ₁ O ₂ ×P ₂ , as a result, the surface pressure between the rail 1 and the friction member 3a increases in the moving direction of the moving body 2, and the braking member There was a drawback that uneven wear occurred, where the wear was large at the leading end of 3a and the wear was small at the rear end.

This invention improves the above-mentioned drawbacks by dispersing and forming a large number of recesses on the braking surface of the braking member that comes into contact with the rail, the distribution density of which decreases or increases in the direction of movement of the moving body. The present invention provides a control device in which the surface pressure between the rail and the braking surface is uniform and there is no uneven wear.

An embodiment of this invention will be described below with reference to FIGS. 3 and 4. In the figure, 8 is a groove 8 that is attached to the brake 3 and is used to adjust the contact area with the rail 1.
The braking member formed with a groove 8a is formed so that the area ratio occupied by the groove 8a is reduced so that the contact area with the rail 1 increases in the direction of movement of the moving body 2 shown by the arrow A. Note that the other parts are completely the same as the conventional one.

With the above structure, when the operating spring 7 is activated while the moving body 2 is descending, the brake 3 moves in the opposite direction to the moving direction of the moving body 2, and is applied to the rail 1 by receiving the force from the operating spring 7. However, as mentioned above, a clockwise rotational moment is generated in the right brake element 3, a counterclockwise rotational moment is generated in the left brake element 3, and the contact area between the rail 1 and the brake surface 8b is If the contact pressure is uniform, the contact pressure between the contact surfaces will increase toward the tip in the moving direction, but in this design, the shape of the braking surface is formed so that the contact area increases toward the tip. Therefore, the surface pressure can be made almost uniform, and uneven wear can thereby be prevented. Further, since the structure of the braking surface for making the surface pressure uniform can be simply formed by forming recesses with varying distribution density, the brake can be manufactured at low cost.

Note that depending on the position of the force applied to the inclined surface 3b of the brake spring 5 by the pressing spring 5, the direction of the rotational moment applied to the brake child 3 may be opposite to that in the above embodiment. The ratio occupied by the groove 8a may be adjusted so that the contact area between the rail 1 and the braking surface 8b becomes smaller toward the tip of the braking member.

Further, in the above embodiment, the contact area is adjusted by adjusting the proportion occupied by the grooves 8a, but the invention is not limited to this, and a large number of recesses are formed on the braking surface to adjust the density. The contact area may be increased or decreased by adjustment.

As described above, according to this invention, the distribution density of the recesses formed on the braking surface is decreased or increased in the direction of movement of the moving body to make the surface pressure between the rail and the braking surface uniform. , uneven wear of the braking member is prevented, and safety during braking can be improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a conventional example, Fig. 2 is a mechanical explanatory diagram during braking, Figs. 3 and 4 show an embodiment of this invention, and Fig. 3 is a front view of the braking member. FIG. 4 is a side view of the braking member. In the figures, the same reference numerals indicate the same or equivalent parts, 1 is a rail, 2 is a moving body, 3 is a brake, 8 is a brake member, 8a is a groove, and 8b is a brake surface.

Claims (1)

[Scope of utility model registration request] A braking device that performs braking by pressing a brake element supported by a movable body against a rail that guides the movable body,
A braking device for a movable body, characterized in that a large number of recesses are formed dispersedly on the braking surface of the braking member attached to the brake element, and the distribution density of the recesses is decreased or increased in the direction of movement of the movable body. .