SU1574930A1 - Wedge brake - Google Patents

Abstract

The invention relates to mechanical engineering, in particular, to a wedge brake, and can be used for braking a movable rod in cabinets, consoles, etc., where it is necessary to raise and lower the cover with a part of the equipment placed on it. The purpose of the invention is to increase the reliability of the device by reducing the rate of fall of the article held. The brake includes a housing 1, a movable rod 2 and a liner 3, spring-loaded by a cylindrical spring 4 to the lid 5. The liner has a transverse wedge groove 6 in which a wedge 7 is installed, a plate spring 8 pressed into the groove 8. In the housing there are grooves 9 through which the wedge is passed 7, and its ends are installed with the possibility of contacting and interacting with the restrictive nut 10 screwed on the body along the thread. 3 il.

Description

FIG, G

The invention relates to mechanical engineering and can be used for braking a rolling rod in cabinets, consoles, where, for adjustment and maintenance, it is necessary to raise and lower the cover with a part of the equipment placed on it.

The purpose of the invention is to increase the reliability of operation by reducing the rate of fall of the retained isotra.

Fig, 1 shows the device for burning the fixed position of the rod, the section; in fig. 2 - section A-A on {lg.1; in FIG. 3 is a section BB in FIG. i (brake at release of wedge / stem),

The device contains corpses 1, of which the movable rod 2 and the liner 3 are installed, internally sprung by the coil spring 4 to the lid 5 “The liner 3 has, in addition to a cylindrical hole for the rod, a transverse groove 6 in the trapezium shape, one hundred -) The angle of which is parallel to the axis of the rod, and the other is inclined to the axis of the rod by ANGLE 4 ± 1. Moreover, the smaller base of the Trapezium is located at the bottom, and the larger one is at the top.

In the transverse groove 6 of the liner 3, a wedge 7 is installed, having a Form Similar to the transverse groove 6 of the tna-3 insertion. Above the wedge there is a plate spring 8 fixed in gas. In case 1 there are also grooves 9, into which horses of wedge 7 enter to contact and interact with restrictive nut 10. Case-1 has an external thread, through which nut 10 and lock nut 11 can be moved. to housing 1.

The brake works as follows

In the initial position, the stem is fixed in the upper position and the liner 3 is pressed by the spring 4 to the lid 5. The coupling wedge 7 by the plate spring 8 and its own weight is wedged between the rod 2 and the liner 3 so that these three bodies are one

(Figure 1).

After the stem is decelerated, the weight of the held product moves the stem down together with the liner 3, compressing the spring 4. This joint movement continues until the ends of the wedge 7 fall to the position of the stop in the nut 10 (FIG. 3), after which the wedge ,

compressing the leaf spring 8, disengages the stem and the liner.

Now the rod is lowered, and the liner under the action of the spring 4, which presses on it with a force greater than the weight of the retained product and several times more than the weight of the liner and wedge, is pushed up sharply and reattaches the rod 2 to the liner 3 (Figure 1). After that, they fall together again, compressing the spring 4, to the position of the stop in the nut 10. In the future, the process is repeated until the load is completely lowered. Moreover, the spring 4 in the initial position has a force of approximately 0.5 of the weight of the product held, and on the wedge 7 in the disengaged state (Figure 3) a spring acts with a force of 0.9 weight of the product.

B device-prototype with a free fall from a height of H 0.5 m, the product falls with a final speed V

-j2gh -j2-9,8. 0.5 3.3 m / s; g - 9.8 m / s1 - the acceleration of the force t is hard.

In the proposed device, with a spring force of 0.9 times the weight of the product, the fall acceleration is reduced by a factor of 10 and is 1 m / s. Then the maximum speed of the movement is V, 5 1 m / s, i.e. decreases by more than 3 times, which significantly reduces the overload when the product is stopped.

In addition, when the device is serviced by the operator, the convenience of operation is significantly increased by reducing physical activity and increasing safety and by raising and lowering the lid with the weight mounted on it.

Claims (1)

Invention Formula A wedge brake comprising a housing with grooves in which a spring-loaded locking element is placed has a movable rod and an insert inside the housing, characterized in that, in order to increase reliability by reducing the falling speed of the retained product, it is provided with a support spring and a nut. the support spring is installed inside the housing under the liner, and the nut is on the outer part of the housing, the locking element is designed in the form of a wedge and is placed on the corresponding wedge groove and through 51574930 the housing grooves, and its protruding engagement with the limiter, the housing ends are fitted with a possible nut. i A - A YU Editor I. Casarda Compiled by V. Kazimiruk Tehred M. Didyk Proofreader N. Korol Order 1773 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, g, Uzhgorod, st. Gagarin, 101 Fig 2 6 - B g Circulation 553 Subscription