A lock for manhole covers

Abstract

A lock for trench manhole covers. The upper cover (1) is engaged with the core seat (3) to form a lock body cavity (4), the lower end of the hole wall of the strip key hole (5) on the upper cover is engaged with the upper end surface of the core seat (3), and the core body (2) is located in the lock body (2). In the body cavity, there is a space for the core body to move in the lock body cavity. There is a lock tongue on the core body, which cooperates with the tongue hole of the lock body cavity wall. The long hole in the core body has a cavity for the core body to move, and the lock body cavity has a dial. A toggle mechanism for moving the core body; there are at least two blind holes (13) in the core body with openings facing the core seat (3), and an upper cylinder (14) and an elastic member (15) are arranged therein; the core seat ( 3) There are at least two stepped through holes (16) corresponding to the blind holes (13), and there are lower cylinders (17) in them, and the upper end face of the core seat and the lower end face of the core body form a first joint surface ( 18), there is a key through hole (19) in the core seat (3); the second joint surface (20) formed by the upper cylinder (14) and the corresponding lower cylinder (17) is located in the stepped through hole (16). on different levels.

Description

Technical field [0001] The invention relates to a lock, in particular to a mechanical lock for a manhole cover. Background technique [0002] In urban municipal construction, all kinds of trench wells need to be equipped with corresponding trench covers. Since there is no special trench cover lock at present, it is easy to lose them. [0003] The announcement date is September 5, 2007, and the invention application document with the announcement number CN101029543 discloses "a kind of mechanical lock" with the application number 200710034697.4. The mechanical lock has a lock body, and the lock body includes a lock cylinder. Cover, core body and core seat; the mechanical lock changes the marbles in the traditional lock structure into cylinders, that is, there are several cylinders in the core cover, and inner columns corresponding to the inner cylinders of the core cover are arranged in the core Body, all corresponding groups of cylinders and inner cylinders have a contact e...

AI Technical Summary

Problems solved by technology

The mechanical lock has good structural performance, high locking performance, and good anti-theft performance. However, due to structural reasons such as the key hole and the rotating core, it is not suitable for locking ditch covers.

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