CN2328700Y

CN2328700Y - Anti-theft lock for manhole cover

Info

Publication number: CN2328700Y
Application number: CN 96213291
Authority: CN
Inventors: 刘宝林
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-06-12
Filing date: 1996-06-12
Publication date: 1999-07-14
Anticipated expiration: 2006-06-12

Abstract

The utility model relates to an anti-theft lock for a manhole cover. The utility model is composed of a positive lock, a negative lock and a special key, and is characterized in that the positive and the negative locks are conveniently fixed at the back of the manhole cover. A lower cover of the manhole cover is fixedly clamped on a lower brim of the manhole cover. The manhole cover can be opened only by the special key. The theft-proof manhole cover is not limited by the size and environment of the manhole cover, and passes five times of experiment use in two years. The utility model has the advantages of simple structure, easy manufacture and assembly, agile open, corrosion resistance, durability, etc. The enforcement of the technology plays definite guarantee function to the government property and the security of the people mass.

Description

Manhole antitheft lock

The utility model belongs to theftproof lock and makes the field.

Existing public technology in the utility model prior art field, its pattern manhole cover lock has only been paid attention to interior lock construction, but sewage silt is flow to the corruption rust that causes in the lock, and the staff easily breaks lock, the deficiency that problems such as cost height but design, and the structure of lock and key is also complicated.

Purpose of design of the present utility model is: at weak point of the prior art, design a kind of simple in structure, open manhole antitheft lock flexibly.

Design scheme of the present utility model is: the back side that will just lock, negative locking fixes on well lid, and well lid lower cover, lock are stuck under the well eaves automatically, and private key can be opened by carrying well lid in the keyhole rotation.Positive and negative lock three-major-items are by the moulding of high-test metal material one-step casting, therefore reach purpose such as simple in structure, cheap, that corrosion resistant is durable.

Description of drawings:

Fig. 1 is that the sight schematic diagram is cutd open in the front after the anti-money lock of well lid is installed.

Fig. 2 is that private key is just being seen and cutd open schematic diagram.

1. just locking with reference to Fig. 1 is by lock (1); Dead bolt (2); Bullet Spring (3); Pad card (4) forms. Negative lock (5) is mould casting. To just lock, Negative locking fixes on the back side diameter of well lid (6), will bear earlier then lock fork and exist The lower eaves of walling crib (7) glides and just locks, and dead bolt will slide back to after the meeting bullet and be stuck in Eaves under the walling crib, this moment, well lid was in the lock shape.

2. be by key cylinder (8) with reference to Fig. 2 private key; Key hook (9) Cover (10); Spring (11) pin (12) forms. It is key be again cleaner, It is staff's all-purpose instrument.

3. positive and negative being locked in after the well lid back side fixes, the distance according to key is a radius again, is tangent point with the rear orifice of dead bolt just, finds out center of circle punching on well lid, this center of circle is exactly a keyhole.

4. when lock is opened, be that Key hook is forwarded to when becoming the 150 degree left and right sides with key cylinder, the Key hook tip is put in the keyhole, and then Key hook is forwarded to when becoming 90 to spend with key cylinder, low sleeve, to advancing to stretch key, screw key finds the dead bolt hole hook again, key, dead bolt certain distance of will moving, on carry key, can open well lid.

Embodiment:

Fig. 1 and Fig. 2 are a kind of embodiment of manhole antitheft lock.

Implement: see figures.1.and.2 and the content of manual, by prior art install, debugging gets final product.

Claims

1. one kind by the manhole antitheft lock of just locking, negative lock, private key are formed, and its feature is as follows:

A: described just the lock is by lock (1); Dead bolt (2); Spring (3); Pad card (4) is formed, and described negative lock (5) is a mould casting, and its positive and negative lock all is fixed on well lid (6) back side.The lock shape is that dead bolt, negative lock all are stuck on the walling crib (7);

B. described private key is by key cylinder (8); Key hook (9); Cover (10); Spring (11); Pin (12) is formed.

2. manhole antitheft lock according to claim 1 is characterized in that: just lock, bear lock and all be fixed on the back side diameter of well lid.

3. manhole antitheft lock according to claim 1 is characterized in that: just lock, bear lock and also can once cast on well lid.

4. manhole antitheft lock according to claim 1 is characterized in that: there is open slot the key cylinder lower end of private key, and Key hook one end is to be clipped in the open slot flatly, and by a pin riveting can be movable.Spring, cover are arranged on the key cylinder.

5. according to its described manhole antitheft lock of claim, it is characterized in that: positive and negative lock is by metal material or nonmetals casting.