NL9201644A - Lock device for a bicycle - Google Patents

Abstract

The invention relates to a lock device for a bicycle, which comprises components which can be fitted and removed, which components, after they have been fitted, result in a bicycle lock which essentially cannot be cracked. Fitting takes place in the following way: an opening for the key is drilled at the intended location in the seat tube. Then, a shaped flanged cylinder with a locking groove is placed against and in the seat tube via the bracket housing, and the abovementioned cylinder is secured, by means of a steel spring, in its place in the seat tube or bracket housing. Then, the double-cylinder lock structure, together with the (extended) key belonging to the lock structure, is placed in the seat tube via the saddle pin opening, and the lock structure is locked in the locking groove, located in that area, of the flanged cylinder. Finally, the pedal axle is fitted with two (?) locking-pin openings in the bracket housing. It is then possible, via the key hole which has already been drilled, to countersink the locking pin of the double-cylinder lock structure in a locking-pin opening of the pedal axle. A bicycle lock which has been put in place in this or similar way is essentially impossible to break open. In the event of unforeseen circumstances, for example the key breaking, it is possible to unlock the lock structure from the flanged cylinder again by means of the (extended) spare key and to remove it via the saddle-pin opening.

Description

Locking device for a bicycle.

The invention relates to a bicycle locking device comprising a lock construction consisting of a double-cylindrical housing with two keyholes and means incorporated in the housing for moving back and forth between the retracted and expanded position of the locking pin present in the housing, which locking pin can move back and forth by means of a key or similar means inserted in the keyhole provided, the free end of the locking pin in the expanded position countersunk in a recess of the bottom bracket, which leads to locking of the specially designed bottom bracket, and means incorporated in the housing for locking and unlocking the lock construction arranged in the seat tube and bracket housing, which construction there is essentially inextricably connected to said frame parts.

Such a locking device is known from the Dutch "Terinzagelegging" 8400707.

In the known locking device, the lock housing / lock housings at the ends are essentially unbreakably secured by welding and / or solder joints, integrally forming part of the frame tube sloping from the bottom bracket to the steering head, in which tube the locking pin (s) ) is capable of reciprocating substantially along the axis of this tube by means of the key inserted in the keyhole or similar member and may engage in an expanded or recessed position in an opening or recess of the head tube and / or bottom bracket .

The drawback of this known locking device is that the construction is designed in such a way that in the event of the lock mechanism becoming inoperative, it cannot be essentially replaced.

Furthermore, this construction requires a completely changed manufacturing process and is essentially only applicable within the manufacturing process. Moreover, such a construction requires special requirements with regard to the heat resistance of the interior of the lock construction.

The object of the invention is to provide a locking device of the said type which does not have these drawbacks.

This object is achieved in that the locking device, consisting of a double-cylindrical lock construction, which construction according to the invention is lowered and is essentially inseparably locked in the seat tube and the bracket housing.

In a latching device which is lysed in this way, the recess in which the locking pin can engage is arranged in the crank shaft adapted for this purpose. This lock can be released without a key or similar means only by sawing or burning both the frame tube and the housing of the locking device and then attempting to remove the underlying part of the locking device.

This results in irreparable damage to the frame.

It is noted that in the Dutch Patent Specification 40050 a locking device for a bicycle is known, in which a locking pin extending through the oblique from the bottom bracket to the steering head is used for locking the inner head tube.

However, the pin is operated by a complicated mechanism by rotating the crankshaft after a key inserted into the lock structure has been turned over and taken out, which construction is mounted within the frame tube running from the crankshaft to the saddle. The lock can be released by dismantling the bottom bracket.

A locking device is known from the Netherlands patent 2380, wherein the housing of the lock mechanism is arranged inside the horizontally running frame tube and by means of locking pin guides, fastened with screws passing through the pipe wall, the locking pin in the expanded position in the openings provided for this purpose. the headset can grab. The locking device is easily lifted by clearing the key entry from the frame tube and then chiseling the locking pin to the retracted position.

The invention is further described with reference to the drawings.

Fig. 1 shows steel spring 10 with the frame tube lips A and the seat tube or locking pin opening C, which serves to unambiguously and essentially unbreakably insert the lock construction into the seat tube and bracket housing.

Fig. 2 shows collar cylinder 9 with locking groove 9 '.

Fig. 3 shows the special design of the bottom bracket 11 with recesses 8 '' for locking pin 8. The purpose of this design is to create the necessary strength of the shaft, as well as making the locking pin essentially untouchable even for the most professional milling machines, while the currently used techniques of cassette bearings, with recesses 8 '' of course and pressed bearings, remain fully applicable.

Fig. 4 is a sectional view of the mounted locking device.

A bore is made in the designated place in seat tube 1 for key mouth 7. Then, via the bracket housing 2, the designed collar cylinder 9 is placed in seat tube 1 and collar cylinder 9 is clamped by means of steel spring 10 against bracket housing 2 and in seat tube 1, whereby the frame tube lips A of steel spring 10 engages in the relevant existing frame tube openings and thus steel spring 10 will form a shaped and unambiguously placed part of bracket housing 2.

Subsequently, the double-cylindrical lock housing 6 is placed in the seat tube 1 via the seat post opening 5. The locking and the essentially unbreakable connection of the lock housing 6 is effected by inserting the extension key or a similar member intended for this purpose into key mouth 7 'and by locking the locking spring 8 'in the housing 6 in the locking groove 9' of the collar cylinder 9 by means of the so-called bayonet locking system, which system guarantees an unambiguous placement.

A key mouth plate is placed on key mouth 7 as a finish.

Finally, the bottom bracket 11 is mounted in the usual way.

It is now possible to let locking pin 8 sink into locking pin hole 8 '' via key mouth 7 via key mouth 7, which has the result that the crankshaft cannot rotate, so that the bicycle is essentially unusable.

Alternative, unsealed embodiments of the locking device described above are: a. In the manufacturing process, a so-called shrink-collar cylinder can be used instead of the mounted collar cylinder 9 in combination with steel spring 10.

The benefits are clear. More advantageous, since steel spring 10 is dispensed with, while the lock housing 6 remains universally applicable without change.

b. A lock housing design with a shaped lockable and unlockable collar instead of collar cylinder 9 with locking groove 9 'and a lock housing with locking spring 8'.

The advantage is that collar cylinder 9 is omitted.

When locking the bottom bracket in this way, which, as well as unlocking, is only possible with the appropriate key or similar element, it is essentially impossible to undo the locked lock other than by sawing, burning or grinding the seat tube 1 and lock housing. 6 at the level of the bracket house and then use the necessary means to remove the remains. In some cases, the frame is essentially irreparably damaged. Other attempts by unauthorized persons to unlock the bicycle locked in this way do not lead to the desired result, because: 1. As already mentioned, bottom bracket 11 cannot be removed axially, which prevents! by locking pin 8 la. Locking pin 8 is untouchable in the current state of the art, while the bottom bracket design adds a certainty dimension to this.

lb. Steel spring 10 may be accessible, but not displaceable, causing locking pin 8 in locking pin opening C and frame tube lips A.

2. Lock housing 6 in combination with collar cylinder 9 cannot be removed or moved significantly, which is prevented by the designed collar.

2a. The lock housing 6 cannot be removed without the appropriate member or key, which is prevented by locking spring 8'2b. Nor can the lock housing be displaced internally, which is prevented by the bayonet locking system of locking groove 9.

In the current state of the art, key mouth 7 'is in fact inaccessible and destruction of the underlying cylinder by the tension element behind locking spring 8' will not yield the desired result, nor will destruction of key mouth 7 and connecting cylinder.

Claims (6)

Locking device for a bicycle, comprising a lock construction characterized by a housing with two equal cylinders with keyholes and means for locking and unlocking the lock construction in a part of the frame and for locking means present in the housing and unlocking the locking pin present in the lock construction in the appropriate bottom bracket. Locking device according to claim 1, characterized in that the lock construction can be mounted inseparably via the seat post opening in the seat tube of the frame by means of the mounting material provided by the bracket housing, i.e. a steel spring / collar cylinder combination, or a shrink collar cylinder. a steel spring for fastening the lock construction with locking collar. Locking device according to claim 1, characterized in that the locking pin, when expanded, is galvanized into a recess of the bottom bracket. Locking device according to claims 1/3, characterized in that the crankshaft is constructed such that destruction of the locking pin is essentially impossible. Locking device according to claims 1-4, characterized in that the locking device is a combination of mountable parts by means of the appropriate means and the key or similar member belonging to the locking device. Locking device according to claims 1-5, characterized in that a mounted locking device is only used by authorized persons using the key or similar member belonging to the locking device, e.g. broken key, disassembled.