CN2359338Y

CN2359338Y - Anti-theft manhole cover

Info

Publication number: CN2359338Y
Application number: CN 99227151
Authority: CN
Inventors: 张小波; 孙育风
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-01-22
Filing date: 1999-01-22
Publication date: 2000-01-19
Anticipated expiration: 2009-01-22

Abstract

The utility model relates to an anti-theft manhole cover, which is a cast iron manhole cover with anti-theft performance. A spring lock of an anti-theft device and an anti-theft fastening tongue use the circle center of the manhole cover as the center and are respectively and symmetrically fixed at the lower parts of the edges at both ends of the diameter of the manhole cover, wherein, the side surface of a lock tongue forms a staircase shape, and the inner part of a corresponding lock casing also forms a corresponding staircase shape. A spring is positioned at the lower part in the lock casing, one end of the spring is propped in the lock casing, and the other end is propped at the back part of the lock tongue. Straight teeth are arranged on the side surface of one side of the lock tongue, the other side of the lock tongue is provided with a limited block, and an opening hole is arranged at the inner side of the lock casing of the straight teeth on the corresponding lock tongue. A circular hole is arranged on the manhole cover, and the inner part of the circular hole is provided with a circular plug connected by screw threads.

Description

Anti-stealing manhole cover

The utility model is a kind of cast iron inspection shaft lid with anti-theft feature, especially a kind of anti-stealing manhole cover that has lock function.

Present widely used cast iron inspection shaft is stamped circular and polygonal, but most cast iron inspection shaft lid based on circle.And the inspection shaft of these cast irons lid is general without any antitheft measure, just is placed on the inspection shaft mouth, is therefore very easily stolen, thereby causes many traffic and personnel's casualty accident, causes damage also for simultaneously the property of country.In order to solve above problem, people also constantly propose the scheme of various solutions, and the new design of concrete anti-stealing manhole cover is also arranged, but because the problem of its cost and practicality never enters the stage of promoting the use of for a long time.

Goal of the invention of the present utility model just provides a kind of have better anti-theft feature and the low anti-stealing manhole cover of cost.

Anti-stealing manhole cover of the present utility model mainly is made up of inspection shaft lid and anti-theft device, anti-theft device is made up of latch lock and antitheft block tongue, and latch lock and antitheft block tongue are that the symmetrical respectively inspection shaft that is fixed in center covers the bottom that the diameter two ends are inspection shaft lid edge with the center of circle of inspection shaft lid.Theftproof lock is made up of lock housing, dead bolt, spring, wherein the side of dead bolt is stepped, corresponding lock housing inside also is the stepped of correspondence, spring is positioned at the bottom of lock housing, and a crown of spring is in lock housing, and the other end withstands on the back recesses of dead bolt, on a flank side surface of dead bolt, be provided with straight-tooth, another side at dead bolt is provided with limited block, and the inboard of the lock housing of the straight-tooth on the corresponding dead bolt is provided with an open hole.Inspection shaft covers and is provided with a circular hole, and it is stifled to be provided with the circle that connects with the spiral shell mosquito in circular hole.During installation, open hole on the lock housing of latch lock is aimed at the circular hole that inspection shaft covers, and dead bolt is stretched to outside the inspection shaft lid, simultaneously antitheft block tongue is installed in the opposite of latch lock, its dead bolt also stretches out outside the inspection shaft lid, after this anti-stealing manhole cover installed, as opening this inspection shaft lid, at first the circle that will cover with the TO inspection shaft of special use was stifled, and then insert open hole with special-purpose straight-tooth shape key, by rotation, dead bolt is inwardly moved, just can open this inspection shaft lid at last.

Advantage of the present utility model is:

1. good anti-theft effect.Do not having under the situation of special tool, common people can't open this inspection shaft lid, and open this inspection shaft lid and also want the regular hour, therefore can effectively prevent the stolen problem of inspection shaft lid, can both play the effect of safety guarantee to country, to the individual.

2. cost simple in structure is low.Latch lock all has only lock housing, dead bolt, three parts of spring, adds antitheft block tongue, and whole anti-theft device has only four parts, so structure is very simple, low cost of manufacture.

3. reliability height.Because simple in structure, latch lock has only 3 parts altogether, and required precision is not high, therefore the fault rate of using is extremely low, can effectively guarantee the reliability of using.

4. good antirust property, corrosion-resistant, high temperature resistant, good seal.

Fig. 1 is a general structure schematic diagram of the present utility model.Have wherein that inspection shaft lid 1, circular hole 11, circle are stifled 12, latch lock 2, antitheft block tongue 3.

Fig. 2 is the plan structure schematic diagram of latch lock 2.Lock housing 21, open hole 211, dead bolt 22 are wherein arranged, straight-tooth 221, limited block 222.

Fig. 3 be among Fig. 2 A-A to cross-sectional view.Lock housing 21, dead bolt 22, spring 23 are wherein arranged.

Embodiment of the present utility model is as follows:

The prefabricated lock housing 21 of method elder generation difference with casting, dead bolt 22, antitheft block tongue 3, one side is provided with an open hole 211 in the inside of lock housing, this open hole is connected with the lock housing inboard, inner bottom surface in lock housing is stepped, two horizontal stands are up and down promptly arranged, corresponding dead bolt 22 is also stepped, match with lock housing, side at dead bolt is that a side of open hole 211 is provided with the straight-tooth 221 of opening usefulness on the corresponding lock housing, the direction of this straight-tooth is an above-below direction, one side is provided with limited block 222 on the opposite of dead bolt straight-tooth, lives dead bolt with control and skids off lock housing, and the height of dead bolt is slightly less than the height of lock housing inboard.During installation, dead bolt is placed the inside of lock housing, the straight-tooth of dead bolt and the open hole of lock housing are positioned at the same side, be provided with a spring 23 between the lower step in lock housing and the lower step of dead bolt, this spring is a stage clip, its effect is to keep dead bolt to stretch out the edge of inspection shaft lid, at last this lock is screwed lower edges at the inspection shaft lid, dead bolt is outside, open hole on its lock housing is aimed at the circular hole that inspection shaft covers, when opening this lock, as long as insert open hole and rotation with corresponding special-purpose straight-tooth shape key, just can cover thereby open inspection shaft with dead bolt to reclaiming.In order to have more theftproof, simultaneously can prevent that also the foreign material on the road surface from falling into open hole, therefore circle stifled 12 is installed in the circular hole 11 that inspection shaft covers, this circle stifled with circular hole between with being threaded, the stifled top of circle also is designed to outer polygon or inner polygon or interior cross, so that, have more theftproof performance simultaneously with the supporting use of corresponding special opening instrument.Antitheft block tongue 3 is located at the opposite of inspection shaft lid lower springs lock, be the two ends that latch lock and antitheft block tongue are located at the same diameter in inspection shaft lid bottom, this antitheft block tongue is screwed the lower edges at the inspection shaft lid, block tongue stretches out the edge of inspection shaft lid, and this antitheft block tongue also can be cast into one simultaneously with the inspection shaft lid.During use, earlier in the hole of the frame bottom that antitheft block tongue one side insertion inspection shaft is covered, put down the inspection shaft lid then, with straight-tooth shape private key the dead bolt of latch lock is regained, inspection shaft is covered in place, again dead bolt is stretched into afterwards in the lockhole of inspection shaft lid frame, take out straight-tooth shape private key after, block up in the circular hole that is screwed into the inspection shaft lid with circle, so just can effectively play antitheft effect.

Claims

1. anti-stealing manhole cover, formed by inspection shaft lid (1) and anti-theft device, it is characterized in that anti-theft device is made up of latch lock (2) and antitheft block tongue (3), latch lock (2) and antitheft block tongue (3) with the center of circle of inspection shaft lid (1) be the center respectively symmetry to be fixed on inspection shaft lid (1) diameter two ends be the bottom at inspection shaft lid edge.

2. anti-stealing manhole cover according to claim 1, it is characterized in that theftproof lock (2) is by lock housing (21), dead bolt (22), spring (23) is formed, wherein the side of dead bolt (22) is stepped, corresponding lock housing inside also is the stepped of correspondence, spring (23) is positioned at the bottom of lock housing (21), one crown of spring (23) is in lock housing (23), the other end withstands on the back recesses of dead bolt (22), on a flank side surface of dead bolt, be provided with straight-tooth (221), another side at dead bolt is provided with limited block (222), the inboard of the lock housing (21) of the straight-tooth (221) on the corresponding dead bolt (22) is provided with an open hole (211).

3. anti-stealing manhole cover according to claim 1 and 2 is characterized in that inspection shaft lid (1) is provided with a circular hole (11), is provided with in circular hole (11) with the circle that is threaded stifled (12).