Patent GB-792244-A (GB)
Title: Clamp device
IPC: B60R1/02
Filed: 1954-10-21
Abstract: 792,244. Clamp fastenings. PUCKERT, E. W. Oct. 21, 1955 [Oct. 21, 1954], No. 30385/54. Class 44 [Also in Group XXXIII A clamp device for attaching a mirror or other motor accessory to a motor vehicle, has a body part and a clamp plate which together provide gripping surfaces adapted to grip a flange on the vehicle as the clamp plate and body part are screwed towards each other by a fixing screw or screws and in which the gripping surfaces are maintained parellel to one another by means of two parallel sets of guides inclined at an acute angle to the axis or axes of the fixing screw or screws, each constituted by a face on one or other of the clamp plate and body part co-operating with a face or edge on the other of said members or on a member which moves therewith during fixing action. As shown in Fig. 2, the body part 1 has a gripping surface 9 and the clamp plate 2 has a gripping part 8 which are maintained parallel in their gripping position by means of guide faces on limbs 7, 11 of the clamp plate which co-operate with faces 5, 12 on the body part. The clamp plate 2 is moved to its clamping position on the body part by means of screws 3 which pass through elongated apertures in the clamp plate 2 and engage threaded bores in the body part. In a modification Figs. 3 and 4, the clamp plate 2<SP>1</SP> is provided with a pair of arms 13, 13<SP>1</SP> each having at its outer end an ear 15, the ears each having a part-spherical depression and combining to grip a spherical head S of a bracket B. The arms 13, 13<SP>1</SP> are moved together to grip the head S by means of a screw 16 and a nut 17. The arms are of inverted L-section and provide a recess in which the body part 1<SP>1</SP> is partially housed. The clamp plate 2<SP>1</SP> is drawn towards the body part 1<SP>1</SP> by means of a screw 22 which passes through an elongated aperture in the clamp plate 2<SP>1</SP> and engages a threaded socket 25 on the body part 1<SP>1</SP>. The clamp plate is provided wth a guide face 2<SP>11</SP>. which co-operates with a guide face on the body part 1<SP>1</SP> and these and a second guide face 26 on the body part which co-operates with the stem of the screw 16 ensures that the gripping face 8<SP>1</SP> of the clamp plate remains parallel to the gripping face 19<SP>1</SP> of the body as the screw 22 is tightened. In another construction Fig. 5 the device is combined with a bracket B. The body part 32 is in the form of a casing and the clamp plate comprises two limbs 39, 40 connected by an intermediate part 41. The limb 39 has an elongated aperture to receive a screw 30 which engages a screw threaded hole in the end of the bracket B. The bracket B is rotatably mounted by means of a spigot 38 in a bush 37 which is secured in an opening 34 in the casing 32. The part 41 of the clamp plate is at an angle to the axis of the screw 30 and co-operates with a side wall 44 of the casing to guide the clamp plate during its clamping movement. The end of the limb 39 is also bent and co-operates with the end of the bush to guide the clamping plate during its clamping movement. During its movement therefore the gripping face of the limb 40 of the clamp plate remains parallel to the gripping face of a rib 43, on the casing. The clamp faces are drawn together by rotating the bracket B relative to the screw 30 and after clamping, the screw is locked to the bracket by means of a grub screw 31.