WO1991011358A1

WO1991011358A1 - Burglary alarm for a bicycle

Info

Publication number: WO1991011358A1
Application number: PCT/DK1991/000028
Authority: WO
Inventors: Bent Emil Petersen
Original assignee: Bent Emil Petersen
Priority date: 1990-02-05
Filing date: 1991-01-30
Publication date: 1991-08-08
Also published as: DK28790A; DK28790D0

Abstract

Burglary alarm for a bicycle, mounted inside the bicycle frame and comprising a ratchet wheel (10) milled out in the bicycle's crank (12) as well as a ratchet pawl (9), which by means of a sliding bolt (3) can be put in or out of engagement with the ratchet wheel (10). The sliding bolt (3) is operated by a rack (7), which can be moved by a toothed wheel (8) worked by means of a lock mechanism (4).

Description

BURGLARY ALARM FOR A BICYCLE.

The invention relates to a burglary alarm for a bicycle, installed inside the bicycle frame.

The peculiar thing about the invention is that inside the bicycle frame, the crank of the bicycle includes a ratchet wheel milled out between two cylindrical stops with a lar- ger diameter than the diameter of the ratchet wheel, and that inside the tube frame of the bicycle a ratchet pawl is installed made to be able to be put in and out of engage¬ ment with the ratchet wheel by the means of a turnable, first lock mechanism. When the ratchet pawl is engaged with the ratched wheel, this burglary alarm will function as a mechanical ratchet, making a high rattle sound when the bicycle is used. When hearing the rattle sound the police or other persons at once will be aware of that the bicycle is being stolen. The lock mechanism could be made to be operated by a key in such a way that the ratchet mechanism easily can be discon¬ nected by the owner, when he wants to use the bicycle. The lock mechanism could be a gear-wheel engaged with a rack installed at the ratchet pawl, so that by turning of the lock mechanism the ratchet pawl can be put in or out of engagement with the ratchet wheel.

To secure against dismounting of the first lock mechanism, the burglary alarm also includes a second lock mechanism. At least one of the lock mechanisms could be a cylinder lock and the other lock mechanism could be installed in such a way that it is only accessible through that tube part of the bicycle frame, inside which the lock mechanism is installed. The first lock mechanism could in this way be made to be operated by a key, which is in the owner's possession only, while the other lock mechanism (system locking device) could be made to be operated by f.inst. an authorized bi¬ cycle dealer only. The invention is explained more explicitly in the following by the means of a performance example in accordance with the invention and referring to the drawing, where Fig. 1 shows a crank with a milled out toothed wheel be- tween two cylindrical stops, which is a part of the burgla¬ ry alarm according with the invention. Fig. 2 shows another part of the burglary alarm and Fig. 3 shows a section of a part of the bicycle frame with the crank and the burglary alarm in accordance with the in- vention.

The part of the burglary alarm, shown in fig. 2, consists of a cylindrical block 1 with milled out holes or passages for a cylinder lock 2, a cylinder lock 4, a toothed wheel 8 and in the block 1 a movable rack 7. The rack 7 is attached to a sliding bolt 3 with a ratchet pawl 9.

The cylinder lock 4 is secured in the block 1 by the means of a pin 5. By turning of the cylinder lock 4 and thereby the toothed wheel 8, the rack 7 and with that the sliding bolt 3 and the ratchet pawl 9 can be moved back and forth. Thereby the ratchet pawl can be put in or out of engagement with the ratchet wheel 10 in the crank 12. On each side of the ratchet wheel 10 a stop 11 is screwed on, which prevents the removal of the crank 12 from the bi¬ cycle frame and thereby prevents the dismounting of the bur¬ glary alarm when it is in connection, i.e. the ratchet pawl 9 is engaged with the ratchet wheel 10. The burglary alarm can only be dismounted by means of the cylinder lock 2, which can only be operated with an authori¬ zed key, and which is only accessible from the end of that tube part of the frame, inside which it is mounted, mainly the tube part of the frame for the bicycle saddle. The invention also covers other mechanisms than the rack/ toothed wheel mechanisms 7, 8, which can put the ratchet pawl 9 in or out of engagement with the ratchet wheel 10. For instance, the toothed wheel 8 could be replaced by an eccentric and the rack replaced with a bar with a stop for the eccentric.

Claims

PATENT CLAIMS.

1. Burglary alarm for bicycles mounted inside the frame of the bicycle, c h a r a c t e r i z e d in that inside the frame the bicycle's crank (12) consists of a ratchet wheel (10) milled out between to cylindrical stops (11) with a larger diameter than the diameter of the ratchet wheel (10), and that there inside the tube frame is mounted a ratchet pawl (9) made to be able to be put in or out of en¬ gagement with the ratchet wheel (10) by the means of a turnable first lock mechanism (4).

2. Burglary alarm according to claim no. 1, c h a r a c - t e r i z e d in that the lock mechanism (4) has a toothed wheel (8) in engagement with a rack (7) mounted on the rat¬ chet pawl (9).

3. Burglary alarm according to claim no. 1, c h a r a c ¬ t e r i z e d in that the lock mechanism (8, 7) has an ec- centric in engagement with a stop on a bar mounted on the ratchet pawl (9).

4. Burglary alarm according to any of the beforementioned claims, c h a r a c t e r i z e d in that a second lock mechanism (2) secures against dismounting of the first lock mechanism (4).

5. Burglary alarm according to any of the beforementioned claims, c h a r a c t e r i z e d in that at least one of the lock mechanisms (2, 4) is a cylinder lock.

6. Burglary alarm according to claim no. 4 or claim no. 5, c h a r a c t e r i z e d in that the second lock mecha¬ nism (2) is only accessible through that tube part of the bicycle frame, inside which the lock mechanism (2) is mounted.