CN2194960Y - Theft-proof crank lock for bicycle - Google Patents

Abstract

The utility model provides a theft-proof crank lock for bicycles, which is composed of a pedal, a crank, a centre shaft and a lock on the crank. A connecting block is sheathed with the centre shaft, and the connecting block is fixed with the centre shaft by male pins. One end of the crank is in the shape of a fork. The connecting block is hinged with the crank by a screw bolt, and corresponding bolt holes and locking pin holes are arranged on both the connecting block and the crank. The edges of the inner sides of the front and the back ends of the connecting block are provided with flanges, and the end surface of a movable crank is provided with a lug boss. The lock is fixed on the crank, and a locking pin matches with the locking pin holes on the crank and the connecting block. The utility model has the advantages of high theft-proof coefficient, simple structure, easy application, etc. and a bicycle and the utility model is combined into a whole. The utility model is suitable for the theft prevention of middle-grade and high-grade bicycles.

Description

Theft-proof crank lock for bicycle

The utility model relates to a kind of bicycle lock, particularly a kind of antitheft crank lock that car, lock are combined as a whole.Be fit to medium-to-high grade bicycle theft-prevention, thief-proof.

Prior art generally is that car, lock separate, and its defective is no matter to lock how to improve, and always exposed stealer is as long as destroying lock just can steal intact car outside, and safety factor is poor; Chinese patent (patent No. 91214090.9) front fork locking device though possessed hidden characteristics, has bigger improvement to front fork structure, does not see and applies.

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, designs a kind of little, effective antitheft crank lock that car, lock can be combined as a whole that improves.

The purpose of this utility model is such realization: the crank that changes the left threading parts of existing bicycle is movable crank.On crank and bicycle middle shaft, increase a contiguous block.Contiguous block by existing mode with pin directly and axis be connected and fixed, pin and pin hole on the contiguous block are that tight fit and its length and pin-and-hole are consistent, contiguous block has bolt hole and front and back lockpin hole, edge, the inside, front and back end tool flange up and down, the crank that matches with contiguous block has respective bolt holes, lockpin hole, and its lower end mask boss, lock body is fixed on the crank, and the lockpin hole on lock pin and crank and the contiguous block matches.

With contiguous block and the movable crank that dormant bolt connects, can make crank forward, fixing backward.Forwards fixing, bicycle can normally be ridden and be sailed; Rearward fixing, then the foot-operated parts on crank top insert trailing wheel steel wire space, cause trailing wheel not rotate.

The contiguous block piece that is rectangle, but also ovalize piece, and two lockpin holes on it are symmetrical distribution along bolt hole.

It is that foursquare cylinder, this cylinder are smaller downwards that lock pin should adopt cross section.

During example structure that the utility model will describe in detail below in conjunction with the accompanying drawings, it has simple in structure, easy enforcement as can be seen, and because of the good advantages such as (destroy lock and promptly destroy bicycle itself) of theftproof performance that car, lock are combined as a whole.

Fig. 1 is a kind of structural front view of the utility model.

Fig. 2 is the another kind of form of structure front view of the utility model.

Fig. 3 is Fig. 1 user mode schematic diagram.

Among the figure: 1 crank, 2 contiguous blocks, 3 axis, 4 lockpin holes, 5 locks

6 pins, 7 bolts, 8 foot-operated 9 trailing wheels, 10 pedal spindles

With reference to Fig. 1-Fig. 3, the crank that changes left threading 8 parts of existing bicycle is movable crank 1, and crank 1 one ends are fork-shaped, sets up a contiguous block 2 on the axis 3 of crank 1 and bicycle.Contiguous block 2 is fixing with axis 3 with pin 6 by current mode, and the pin-and-hole on pin 6 and the contiguous block 2 is a tight fit, and its length consistent with pin-and-hole (part of emerging does not have), pulls in order to avoid influence the front and back of activity crank 1.With equal corresponding bolt 7 holes and lockpin holes 4 of tool on the hinged contiguous block 2 of bolt 7 and the movable crank 1, two lockpin holes 4 on the contiguous block 2 also are symmetrical distribution along bolt 7.Edge, the inside, contiguous block 2 front and back ends tool flange, movable crank 1 lower end mask boss.Lock body is fixed on the crank 1, and the lockpin hole 4 on lock pin and crank 1 and the contiguous block 2 matches.Flange is used to offset the destructive power of bicycle when fall down on the left side, protection lock 5 lock pins.The effect of boss is to protect pin 6 holes that are connected with axis 3 when bicycle locks backward, prevent stealer under face up and get pin 6.Place's rectangularity piece, groove but contiguous block 2 and movable crank 1 match, but also ovalize piece, groove.Configuration lock 5 on it.Lock core is screwed on movable crank 1, and the lock cover is fixed with riveting, weldering mode, and the thickness of lock cover should be a little bigger, wants tight, firm with the fixing of crank 1.The width of lock 5 should equate with the thickness of crank 1.Keyhole is provided with movable protecting cover, prevents that silt and rainwater from entering.It is foursquare cylinder that the lock pin that matches with square lockpin hole 4 should adopt cross section, this cylinder is gradually little downwards, its role is to reduce move up and down resistance and increase firm degree of lock pin, behind the trailing wheel of bicycle locking simultaneously, even destroyed the dormant bolt on the crank, can not pull crank.The keyhole of lock 5 can select to be installed in the appropriate location on the square or oval movable crank 1.Foot-operated 8 are fixed on the other end of movable crank 1 by pedal spindle 10, and pedal spindle 10 exposed parts are cylindrical, make its inconvenience dismounting.

Using method: when bicycle does not use, unblank 5 groups to rise the lock pin of fixing movable crank 1, then movable crank 1 is pulled backward put in place after locking again, foot-operated 8 of crank 1 top is inserted in the trailing wheels 9 steel wire spaces, trailing wheel promptly can not rotate.Otherwise then bicycle can normally use.

Claims (5)

1, a kind of bicycle theft-prevention crank lock, form by the lock on foot-operated, crank and axis, the crank, it is characterized in that: contiguous block is directly also used dowel fixes with the axis socket, crank one end is fork-shaped, contiguous block and crank bolted splice, the bolt hole of equal tool correspondence and lockpin hole on it, edge, the inside, contiguous block front and back end tool flange, movable crank lower end mask boss, lock body is fixed on the crank, and the lockpin hole on lock pin and crank and the contiguous block matches.

2, bicycle theft-prevention crank lock as claimed in claim 1, it is characterized in that: contiguous block and crank are hinged with dormant bolt.

3, bicycle theft-prevention crank as claimed in claim 1 lock is characterized in that: the contiguous block piece that is rectangle, and two lockpin holes on it are symmetrical distribution along bolt hole.

4, bicycle theft-prevention crank lock as claimed in claim 3, it is characterized in that: contiguous block is an elliptical blocks.

5, bicycle theft-prevention crank lock as claimed in claim 1, it is characterized in that: lock pin is that cross section is foursquare cylinder.

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