Patent GB-1367876-A (GB)
Title: Restraining device for a vehicle occupant
IPC: B60R21/04
Filed: 1971-01-11
Abstract: 1367876 Vehicle restraint device ACCLES BRITAX Ltd 30 Sept 1971 [30 June 1970 11 Jan 1971] 31637/70 and 1186/71 Heading B7B A vehicle occupant restraint apparatus comprises a rigid arm pivotally supported by mounting means, the arm being lightly biased towards the occupant's chest, there being means for automatically locking the arm when the occupant or the vehicle is subjected to sudden movement caused by a vehicle collision. In a preferred embodiment, Fig. 2, a pad 1 is rigidly or rotatably mounted on the upper end of a cranked swing arm 2 the lower end of which is mounted on a rotatable shaft provided with a releasable locking means 3. Padding may be provided for protection of the occupant's knees. A latch locking the shaft with the arm in its inoperative position may be released manually or automatically when a passenger is seated in the vehicle or when some part is operated, such as an ignition circuit, the brakes or gear-box, the engine or a switch on the speedometer which is actuated on exceeding a predetermined low speed of the vehicle. Upon release the arm 2 swings towards the occupant under suitable biasing means such as a spring. A further switch may be provided which is actuated by say, opening of the car door, so that the arm is held in the inoperative position when the occupant wishes to get out of the seat. To allow free movement of the occupant when the arm 2 is in the operative position an inertia locking means, Fig. 3, may be provided in which a pawl 12 mounted on a plate 13 is lifted into engagement with a ratchet 11 which is concentric with a fixed shaft 10 and rigidly attached to the arm. Lifting of the pawl 12 into engagement with the ratchet 11 could be achieved by a variety of known locking mechanisms responsive to vehicle speed. In certain circumstances the plate 13 may alternatively be formed as a sector of a disc brake held against rotation by a pair of brake discs sandwiching the plate until a predetermined force is developed at the pad 1. Furthermore, the thickness of the disc sector may be increased in its direction of movement relative to the brake pads so that resistance of movement of the arm 2 would increase with distance travelled. Referring to Fig. 5, when the brake 32 is released in direction 33 fluid pressure from generator 21 is connected to cylinder 28 to move piston 29 and hence push rod 31 against spring 30 to either move the restraining device by a mechanical or electrical connection into the operative position or alternatively to hold a locking means which restrains the device in the operative position. The push rod 31 may also be adapted to hold a tongue of a door lock, Fig. 6 (not shown), in the locked position until the engine is switched off so that the tongue is automatically withdrawn by a spring and the door released. As shown in Fig. 9, cranked arm 41 is rotatably mounted on a shaft 44 passing through a carriage member 47 which is slidable in tubular housing 48. Arm 41 is connected by linkage 45 to a check device 46 which is inertia locking or responsive to vehicle acceleration forces to lock arm 41 in its operative position. Upon a vehicle collision, carriage member 47 is carried to the right, as shown in Fig. 9, for apertured disc 48<SP>1</SP> to slide down rod 50 compressing the honeycomb 49 to exert a retarding force on arm 41.