Patent GB-447904-A (GB)
Title: Improvements in connection with thief-proof devices for, and means of preventing unauthorised use of motor vehicles
IPC: B60R25/10
Filed: 1934-11-14
Abstract: 447,904. Guarding against unauthorized use of motor vehicles. EVANS, C. J., and EVANS, S. C., 99, London Road North, Lowestoft. Nov. 14, 1934, No. 32753. Addition to 408,712. [Class 79 (iii)] [See also Group XXXVII. The device for causing the doors &c. of a motor vehicle to be automatically looked or fastened in the event of unauthorized manipulation of the brake or gear-changing mechanism, claimed in the parent Specification, is associated with a plurality of means for controlling the ignition or starting system, so that it remains or is rendered operative or inoperative according to which control means is used in starting the vehicle. The arrangement comprises a second or alternative switch which may be incorporated with the ordinary ignition or starting switch and operated by a special key or which may be an independent switch concealed and /or operated by a key or combination lock. A compound switch adapted to be operated by alternative keys 29 or 30 is shown in Fig. 1, the ignition switch 35 in the front part of the casing 21 being operated alone if the ordinary key 30 is employed whilst, if the special key 29 is used, both the ignition switch and a rear switch 42, putting the theft-preventing device in or out of operation, are actuated. For this purpose the spring pressed contact plates 35, 42 of the respective switches are carried by separate but coaxial key-slotted spindles 33, 34, the rear spindle 34 being normally secured by a rotary barrel lock 59 carried by the partition wall 27 of the casing. In an alternative construction, the casing of the rotary barrel lock is secured to the rear spindle 34, whilst the inner portion 60 of the lock is integral with the spindle 33. In this case, the theft preventing device would be normally inactive and be brought into operation by use of the ordinary ignition key 30 whilst, if the special key 29 is used, the lock between the two spindles is released and only the front spindle 33 would be rotated. In the circuit arrangements shown in Figs. 5 and 20, 64 represents the gear &c. actuated switch of the parent invention for bringing into operation the door &c. locking means 68 and audible and/or visual alarm means 67 and which may also cut-off the ignition and/or fuel supply. Fig. 5 shows coil ignition 65 and a compound switch 21 as in Fig. 1. The theft preventing means is normally in operation, the bridge 70 of the rear switch 42 normally connecting terminals 54, 55 leading to a terminal 71 on the switch 64 and thence to the alarm &c. means 67, 68. When the ignition switch 35 is operated by the ordinary key 30 the terminals 50, 51 are bridged putting the ignition coil 65 in circuit with the battery 63 through the switch 64. If, however, the special key 29 is used the bridge 70 of the rear switch 42 is shifted to the terminals 52, 53, current then being supplied direct to the coil 65 and the alarm &c. devices 67, 68, being cut out of action. In the arrangement shown in Fig. 20, an ordinary ignition switch 83 is used in conjunction with a separate concealed and/or locked switch 84 and the switch 64 acts through an electromagnetic switch 73, magneto ignition 66 being shown. In this form the theft-preventing means is normally cut out and remains inactive if the ignition is switched on by the switch 84, it is, however, brought into operation if the switch 83 is employed. Sixteen circuit arrangements are shown in the drawings accompanying the Specification, representing all combinations of the following four alternatives :-theft-preventing means normally in or out of action, coil or magneto ignition, compound or separate switches, switch 64 connected to alarms &c. directly or through the electromagnetic switch 73.