CN200952288Y - Manhole cover antitheft lock - Google Patents

Abstract

The utility model discloses a thief resistant for well cover, which comprises a positive lock, a negative lock, as well as a special key, which is characterized in that the positive lock and the negative lock are conveniently fixed on the back of the well cover, and the lower cover of the well cover will be firmly blocked on a lower eaves of the well loop. The well cover can be opened only through the special key without the restrictions of size of well cover and environment. Through experimental use, the utility model has the advantages of simple installation, flexible opening, corrosion resistance, as well as durability, thus the implementation of the technology will play a role in safeguarding the state property and the safety of the masses.

Description

Manhole antitheft lock

Affiliated technical field

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

Background technology

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 the corruption that exists sewage silt to flow to cause in lock rust, the staff easily breaks lock, the deficiency of problem such as cost height and design, and also more complicated of the structure of lock and key.

Summary of the invention

The purpose of the utility model design is: the weak point of design before improving, design a kind of more perfect unlatching simple in structure 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.Well lid lower cover, lock are stuck under the well eaves automatically.Private key by keyhole go down rotation, on carry, well lid can open.Just lock, negative lock two big parts are by the moulding of high-test metal material one-step casting, so reach purpose such as simple in structure, cheap, that corrosion resistant is durable.

Description of drawings:

Fig. 1 is that the normal cross-section after manhole antitheft lock is installed is looked schematic diagram.

Fig. 2 is a private key normal cross-section schematic diagram.

1, just locking with reference to Fig. 1 is by lock (1); Dead bolt (2); Spring (3); Pad card (4) spring dirt-proof boot (a) is formed.Negative lock (5) is a mould casting.To just lock, bear locking and fix on the back side diameter of well lid (6), will bear the following eaves of lock fork in walling crib (7) then, and glide and just lock, dead bolt will be slided resilience after the meeting and be stuck in eaves under the walling crib, and well lid is in the lock shape at this moment.

2, be by key cylinder (8) with reference to Fig. 2 private key; Key hook (9) cover (10); Spring (11) pin (12) is formed.It is key be again cleaner, be 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 portion sky of dead bolt just, finds out center of circle punching on well lid, this center of circle is exactly a keyhole.

When 4, lock is opened, be that Key hook is forwarded to when becoming the 160 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, lid can drive a well greatly.

5,, easily and open, so present technique adopts half-blindness hole, middle strutting, doublet and anteposition in the dead bolt guide pad by imitation key thing hook owing to the hole in the guide pad of dead bolt rear end.The most advanced and sophisticated punching of key groove milling makes the dead bolt rear end that fits like a glove, key tip, so have only private key to open.

The specific embodiment

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

Concrete enforcement:, get final product by existing technology installation, debugging with reference to the content of Fig. 1, Fig. 2 and description of drawings.

Claims (7)

1. one kind by the manhole antitheft lock of just locking, negative lock, private key are formed, and it is characterized in that: described just the lock is by lock (1); Dead bolt (2); Spring (3); Pad card (4); Spring dirt-proof boot (a) is formed; Described negative lock (5) is that mould casting constitutes; Its positive and negative lock all is fixed on the diameter of well lid (6) back side, and the lock shape is that dead bolt, negative lock all are stuck on the walling crib (7); 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: lock (1), negative lock (5) also can once be cast on the diameter of the well lid back side.

4. manhole antitheft lock according to claim 1 is characterized in that: there is open slot the key cylinder of private key (8) lower end, and Key hook (9) one ends are flat being clipped in key cylinder (8) open slot, by a pin (12) riveting, can be movable; Spring (11), cover (10) are arranged on the key cylinder (8).

5. manhole antitheft lock according to claim 1 is characterized in that in the middle of the guide pad of manhole antitheft lock dead bolt (2) rear end blind hole being arranged, and post is arranged in the hole, also can be semicircle blind hole strutting, and post links to each other with anterior.

6. manhole antitheft lock according to claim 1 is when is characterized in that private key is opened manhole antitheft lock, dead bolt (2) rear end guide pad is the point of contact motion.

7. manhole antitheft lock according to claim 1 is characterized in that: just lock, bear lock by metal material or nonmetals casting.

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