Tapeline with unidirectional transmission mechanism

Abstract

The invention relates to a measuring tape with unidirectional transmission mechanism, comprising cranking handle (1), cranking seat (3) and tape core mechanism (100) for driving tape (15) draw out and roll up. The cranking handle (1) which can turn over is set on the cranking seat (3). It is characterized in that a facing (4) and linking block (5) are set between the cranking seat (3) and the tape core mechanism (100). The facing (4) is fixed on the cranking seat (3) and rotates as the cranking seat rotates. The top end of linking block (5) protrudes out of the cranking seat (3) and the bottom end which can be disassembled can be matched with embedding groove (41) of facing. Elastic part (52), which makes the linking block (5) always possess the trend of protruding the cranking seat, is set at the bottom of said linking block (5). Compared with prior technology, merits of invention are that by the disassembling connection of linking block and tape core mechanism unidirectional rotation of the cranking seat and the tape core mechanism is realized; the problem that when tape rolls up the cranking handle hurts people is avoided while rolling up is smoother; it is provide with compact total structure, simpleness, practicality, low part cost and convenient combination.

Description

technical field [0001] The invention relates to a tape measure, in particular to a swing-type tape measure with a one-way transmission mechanism. Background technique [0002] During the use of existing measuring tapes for measuring long distances, the tape is generally rewound in a rolling manner, that is, the rocker is shaken, and through the cooperation of the bushing and the rotating shaft, the core is driven to rotate, so that the drawn tape is wound onto the core. , the handle rotates synchronously with the core, the handle rotates one turn, and the tape measure retracts one turn accordingly. The following discloses several tape measures that are rewound in a rocking and rolling manner. [0003] Chinese utility model patent: ZL91212457.1 discloses a "quick winding tape measure" (publication number: CN2092740U). The measuring tape is characterized in that a device is added between the rotating shaft and the rocking handle so that the measuring tape can be retracted qu...

AI Technical Summary

Problems solved by technology

[0005] In the existing rocking tape measure, the tape shaft and the rocking handle are bidirectionally connected, that is, the rocking handle and the tape shaft rotate together when winding or unwinding, which has the following disadvantages: first, when unwinding, the rocking The handle may hit the user's body, or even hurt people; secondly, when unwinding, the tape is pulled out with relatively large resistance, which affects the unwinding speed; finally, when unwinding, the handle may reset during the rotation process, causing the core to stop Turning and pulling the tape in reverse may cause a caliper phenomenon, damage the tape, and affect the progress of the work

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