CN202579737U - Cam anti-receding device - Google Patents

Abstract

The utility model relates to a cam anti-receding device. Retaining cams are mounted on pin shafts, spring clamps and the pin shafts are fixed on a bottom plate, one end of a torsional spring is fixed on each spring clamp, the other end of each torsional spring penetrates through a pinhole on each retaining cam, each retaining cam automatically rotates inwards around the corresponding pin shaft under the elastic action, a retaining plate is fixed on a rail, and each retaining cam and the retaining plate are contacted on a contact surface in a pressing manner. By the aid of the anti-receding device, when an anti-receding mechanism moves upwards, friction produced by the retaining cams sliding on the surface of the retaining plate enables the retaining cams to rotate downwards, a gap between each retaining cam surface and the retaining plate is reduced in tendency, each retaining cam gradually presses the retaining plate, the pressure is increased while the friction is larger, the friction is increased to be large enough, and each retaining cam and the retaining plate are prevented from relative movement by the aid of extremely strong resistance, so that self-locking is achieved to prevent the mechanism from receding.

Description

A kind of cam is prevented unloading device

Technical field

The utility model relates to the anti-unloading device of a kind of cam.Belong to the recreation facility technical field.

Background technique

The general ratchet anti-back mechanism structure of using is complicated, and noise is big, impacts greatly, and is easy to wear to ratchet ratchet easy-rupturing.

Summary of the invention

In order to overcome existing deficiency, the utility model provides a kind of cam to prevent unloading device.

A kind of cam is prevented unloading device, base plate, stopping cam, rotating spring, bearing pin, retaining plate, spring clamp; Annexation between the above-mentioned parts:

The stopping cam is installed on the bearing pin, and spring clamp and bearing pin are fixed on the base plate, and rotating spring one end is fixed on the spring clamp; The other end passes the aperture on the stopping cam, and the stopping cam inwardly rotates around bearing pin under elastic reaction automatically; Retaining plate is fixing in orbit; The stopping cam presses at the surface of contact place with retaining plate and contacts.

Retaining plate is motionless; Anti-retrogression mechanism moves downward; 2 frictional force that produce along the slip of retaining plate surface of stopping cam make the oriented top rotation of two stopping cams trend; Stopping camming surface and retaining plate gap are tending towards increasing, and the surface friction drag that produces between stopping cam and retaining plate is very little, can not stop both relative movement.

The utility model has the advantages that to have anti-unloading device, mechanism moves upward when anti-retrogression, and the stopping cam rotates the stopping cam downwards in the frictional force that the slip of retaining plate surface produces; Stopping camming surface and retaining plate gap are tending towards reducing, and the stopping cam also compresses retaining plate gradually, and pressure increases; Frictional force is also big more; Frictional force increases until enough big, and extremely strong resistance stops both caused by relative motion self-lockings, and prophylactico-therapeutic institution falls back.

Description of drawings

When combining accompanying drawing to consider; Through with reference to following detailed, can more completely understand the utility model better and learn wherein many attendant advantages easily, but accompanying drawing described herein is used to provide the further understanding to the utility model; Constitute the part of the utility model; Illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model, like figure wherein:

Fig. 1 is the structural representation of the utility model.

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Embodiment

Obviously, the many modifications made based on the aim of the utility model of those skilled in the art and the variation protection domain that belongs to the utility model.

Embodiment 1: as shown in Figure 1,

A kind of cam is prevented unloading device, base plate 1, stopping cam 2, rotating spring 3, bearing pin 4, retaining plate 5, spring clamp 6.

Base plate 1, stopping cam 2, rotating spring 3, bearing pin 4, retaining plate 5, the annexation between the spring clamp 6:

Stopping cam 2 is installed on the bearing pin 4, and spring clamp 6 is fixed on the base plate 1 with bearing pin 4, and rotating spring 3 one ends are fixed on that the other end passes the aperture on the stopping cam 2 on the spring clamp 6, can make stopping cam 2 under elastic reaction around bearing pin 4 inwardly rotation automatically.Retaining plate 5 fixing (track does not mark in the accompanying drawings) stopping cams 2 in orbit press at the surface of contact place with retaining plate 5 and contact.

Working principle: retaining plate 5 is motionless; Anti-retrogression mechanism moves downward; 2 frictional force that produce along the slip of retaining plate surface of stopping cam make the oriented top rotation of two stopping cams trend; Stopping camming surface and retaining plate gap are tending towards increasing, and the surface friction drag that produces between stopping cam and retaining plate is very little, can not stop both relative movement.Mechanism moves upward when anti-retrogression, and stopping cam 2 rotates the stopping cam downwards in the frictional force that the slip of retaining plate surface produces, and stopping camming surface and retaining plate gap are tending towards reducing; The stopping cam also compresses retaining plate gradually; Pressure increases, and frictional force is also big more, and frictional force increases until enough big; Extremely strong resistance stops both caused by relative motion self-lockings, and prophylactico-therapeutic institution falls back.

As stated, the embodiment of the utility model has been carried out explanation at length, but as long as break away from the inventive point and the effect of the utility model in fact a lot of distortion can not arranged, this will be readily apparent to persons skilled in the art.Therefore, such variation also all is included within the protection domain of the utility model.

Claims (1)

1. the anti-unloading device of cam is characterized in that base plate, stopping cam, rotating spring, bearing pin, retaining plate, spring clamp; Annexation between the above-mentioned parts:

The stopping cam is installed on the bearing pin, and spring clamp and bearing pin are fixed on the base plate, and rotating spring one end is fixed on the spring clamp; The other end passes the aperture on the stopping cam, and the stopping cam inwardly rotates around bearing pin under elastic reaction automatically; Retaining plate is fixing in orbit; The stopping cam presses at the surface of contact place with retaining plate and contacts.

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