CN2147507Y

CN2147507Y - Safety snap device for band tape

Info

Publication number: CN2147507Y
Application number: CN 92242047
Authority: CN
Inventors: 李诗林
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-18
Filing date: 1992-11-18
Publication date: 1993-11-24
Anticipated expiration: 2002-11-18

Abstract

The utility model relates to a safety snap device for a curve ruler, comprising a shell, a hollow rotary wheel, a key, a curve ruler plate, a reed, an extension spring, a cramp, etc. The rotary wheel can be turned by making a center post as the center of a circle for the reed is coiled on the hollow position of the rotary wheel, one end of the reed is combined at the rotary wheel, and the other end is fixed on the center post of the shell. The pivot hole of the key is sheathed and closed on the convex post of the shell, the extension spring is extended and fixed on the bottom left corner of the shell, the cramp on the key is buckled to the rotary wheel, and the effect of a ratchet wheel is generated. And thus, the curve ruler plate can be optionally and automatically positioned by the utility model with a reasonable and safe structure, and the utility model is suitable to the existing steel tapes of various types.

Description

Safety snap device for band tape

The utility model relates to a kind of button locking apparatus, particularly a kind of tape measure safety snap device.

Existing steel tape does not generally all have locating device, even there are some steel tapes that locating device is arranged, all is to realize by the mode of pushing down band tpae sheet yet.This kind locator meams is reliable inadequately, occurs skidding sometimes.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and provides a kind of band tpae sheet that makes arbitrarily to locate automatically, and tape measure safety snap device rational in infrastructure, reliable in action.

The purpose of this utility model can reach by following measure: the utility model comprises housing, middle loose pulley, button, band tpae sheet, it is characterized in that: the two-wheeled sheet is established in the runner both sides, wheel sheet edge is provided with equidistant teeth groove continuously, establish a pivot hole in the middle of the button, a cramp is established in its upper end, an extension spring is established in its below, one reed is wound in the hollow part of runner, one end of this reed is incorporated into runner, the other end then is fixed on the newel of housing, the pivot hole of button is sleeved on the projection of housing, and extension spring stretched is fixed on the below of housing, cramp can be detained to runner.

Fig. 1 is a three-dimensional exploded view of the present utility model;

Fig. 2 detains the structural representation that ends under the state for the utility model is in;

Fig. 3 is in structural representation under the release conditions for the utility model.

The utility model is described in further detail below in conjunction with accompanying drawing (embodiment):

With reference to Fig. 1～Fig. 3, the utility model is made up of housing 1, middle loose pulley 2, button 3, band tpae sheet 21, reed 22, extension spring 33, cramp 31 etc.Middle loose pulley 2 both sides are provided with two-wheeled sheet 23, and wheel sheet 23 edges are provided with equidistant monocline direction V font teeth groove continuously, can be for coiling one band tpae sheet 21 in the middle of the two-wheeled sheet 23; Establish a pivot hole 32 in the middle of the button 3, a cramp 31 is established in button 3 upper ends, and the width of this cramp 31 is a bit larger tham the width of runner 2, and an extension spring 33 is established in button 3 belows; A newel 11 is established at housing 1 center, and side is established a projection 12.One reed 22 is wound in the hollow part of runner 2, one end of this reed is incorporated into runner 2, the other end then is fixed on the newel 11 of housing 1, runner 2 can be rotated for the center of circle by this newel 11, pivot hole 32 with button is sleeved on the projection 12 of housing 1 again, and these extension spring 33 stretchings are fixed on housing 1 lower left corner, the cramp 31 on the button 3 is detained to runner 2; And when button 3 suffered pressure left, extension spring 33 can draw back cramp 31, made runner 2 go back to original position, had a kind of ratchet effect.

The utility model has following advantage compared to existing technology: band tpae sheet is arbitrarily located automatically, and rational in infrastructure, safe and reliable, the cost of required increase is lower, applicable to existing all types of steel tape.

Claims

1, a kind of tape measure safety snap device, comprise housing (1), middle loose pulley (2), button (3), band tpae sheet (21), it is characterized in that: two-wheeled sheet (23) is established in runner (2) both sides, wheel sheet (23) edge is provided with equidistant teeth groove continuously, establish a pivot hole (32) in the middle of the button (3), a cramp (31) is established in its upper end, an extension spring (23) is established in its below, one reed (22) is wound in the hollow part of runner (2), one end of this reed (22) is incorporated into runner (2), the other end then is fixed on the newel (11) of housing (1), the pivot hole (32) of button (3) is sleeved on the projection (12) of housing 1, and extension spring (33) stretched be fixed on the below of housing (1), cramp (31) can be detained to runner (2).