CN2178671Y

CN2178671Y - Anti-theft siren for bicycle

Info

Publication number: CN2178671Y
Application number: CN 93247424
Authority: CN
Inventors: 毛建昌
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-09
Filing date: 1993-12-09
Publication date: 1994-10-05
Anticipated expiration: 2003-12-09

Abstract

The utility model relates to an anti-theft alarm device for bicycles, which overcomes the defects of too complicated structure, large volume, inconvenient installation and inconvenient repair existing in alarm circuits in the prior art. A metal contact head is arranged on a front fork of a bicycle, and an alarm is arranged on an inclined beam of the bicycle. After the bicycle stops, the bicycle head can naturally deflect for a certain angle, the contact head 2 can be contacted with a voltage output contact head 3 on the alarm 6, an alarm key switch can be opened, and the alarm circuit can be in an alarm waiting status. When the bicycle is stolen by a thief, the bicycle head is wrenched, the contact head 2 is separated from the contact head 3, and the alarm can send out sound for alarm at once.

Description

Anti-theft siren for bicycle

The utility model relates to a kind of bicycle anti-theft alarm device.

It is one with lock body and warning that existing bicycle theft-prevention newspaper is stolen annunciator many, have only when lock body and pried open or locking bar is clamped and just can send alerting signal when disconnected, the multifunction bicycle antitheft alarm system is also arranged, as CN90222936.2 " multifunction bicycle burglar alarm ", it is declined by mercury bead and wipes the antitheft alarm system that sensor, touching type induction control circuit and the disconnected alarm control circuit of chain pincers are integrated and form to sop up liquid, it to picking lock, the disconnected chain of pincers, remove car or the destruction annunciator all can be reported to the police.But, complicated because its element is many, cost is improved, volume is big in addition, makes troubles to installation.

The purpose of this utility model is that a kind of cost of design is low, and volume is little, is convenient to the reliable alarm bicycle anti-theft alarm device is installed.

The purpose of this utility model is achieved in that a metal contact 2 is housed on the front fork 1 of bicycle, sounding oscillating circuit annunciator 6 is housed on the cant beam 7 of bicycle, and the voltage output end head 3 on the annunciator 6 is drawn the apical position that is contained in the hard sleeve 4 by lead 10.After bicycle parking, the inclined to one side naturally give part of a turn of bicycle head, contact 2 also contacts immediately with contact 3, at this moment opens alarm switch 5, and annunciator just is in treats alarm condition.When the burglar stole car, as long as move headstock, just contact 2 and contact 3 can dialysis, annunciator is sounding alarm immediately.

Be described in further detail below in conjunction with accompanying drawing.

Accompanying drawing 1 is that warning device of the present utility model is provided with scheme drawing on bicycle; Accompanying drawing 2 is the contact 3 on the annunciator and the cut-away view of sleeve pipe 4; Accompanying drawing 3 is sounding oscillating circuit figure of annunciator.

Referring to accompanying drawing 3, power supply E(adopts 4 joint 1.5V dry storage batterys among the figure), source switch 5, alerting signal producer integrated package A, loudspeaker 11, potential device W and

metal contact

2,3 constitute alarm control circuits.

When contact 2 with after 3 contact, closed source switch 5, (4) pin of integrated package A is in active potential in the warning circuit, makes (3) pin output low level, loudspeaker 11 are noiseless, whole warning is in the wait alarm condition; If in a

single day contact

2 and 3 disconnects, potential device W makes (4) pin be in high potential, and circuit produces vibration, and loudspeaker 11 send alerting signal.

Referring to accompanying

drawing

1,2, metal contact 2 usefulness screws 9 laterally are fixed on the bicycle front fork 1, the shell of annunciator 6 is fastened on the bicycle cant beam 7 with fastener 8, in addition, the source switch 5 of alarm circuit is controlled by key, key hole is on the shell of annunciator, and the voltage output end head 3 of annunciator 6 is fixed on apical position in the hard sleeve 4 by lead 10, and sleeve pipe 4 is affixed with body case of annunciator.After bicycle comes to a complete stop, headstock nature deflection 20-80 degree angle, contact 2 also contacts immediately with contact 3, at this moment open warning key switch (being closed source switch), annunciator just is in the wait alarm condition, when the burglar steals car and moves headstock, contact 2 and 3 dialysis immediately, (4) pin current potential raises in the warning circuit, and circuit produces vibration, loudspeaker 11 sounding alarms.Have only when headstock to reset, promptly contact 2 contacts again with 3, or uses the key power cut-off, and alarm sound just can stop.

Separate with insulation mat 12 between contact 3 and the sleeve pipe 4 among Fig. 2.

The utility model is simple in structure, and volume is little, be convenient to install, and cost is low, and in addition because circuit is uncomplicated, maintenance is also convenient.

Claims

1, a kind of bicycle anti-theft alarm device, it is characterized in that it is that a metal contact 2 is housed on the front fork 1 of bicycle, sounding oscillating circuit annunciator 6 is housed on the cant beam 7 of bicycle, the voltage output end head 3 of annunciator 6 is drawn the apical position that is contained in the hard sleeve 4 by lead 10, sleeve pipe 4 is affixed with body case of annunciator, separate with insulation mat 12 between contact 3 and the sleeve pipe 4, the source switch 5 of alarm circuit is by key control, and key hole is on the shell of annunciator.