Patent GB-822563-A (GB)
Title: Improvements relating to fastening device and method of manufacturing same
IPC: F16B5/10
Filed: 1956-05-22
Abstract: 822,563. Stud and socket fastenings; bolts etc.; screw-heads. ZAHODIAKIN, V. F. May 22, 1956 [Feb. 15, 1956], No. 15853/56. Classes 44, 89(1) and 89(2) A stud and socket fastening comprises a contractable sleeve 30 interposed between a stud element 24 and a socket element, and adapted to grip and hold the stud element in the fastened position. The socket element comprises a fixed, internally threaded cylinder 25, Fig. 3, of larger diameter than an axially registering hole 22 in a member 20 to be fastened. Within the cylinder is an expandible sleeve 30, Figs. 3 and 10, which is split longitudinally at 31, diametrically opposite to which is a thinned area 32 which provides resiliency for the contraction and expansion of the sleeve, the sleeve being contracted and inserted into the cylinder 25 before fixing to member 20. If desired the sleeve 30 may have an internal expander, Fig. 14 (not shown). The bore of the sleeve 30 is larger at one end than the other, the different bores 36, 37 being joined by a tapered wall 38; a double keyhole slot 40, Fig. 4, utilizes the bore 37 as its central bulge and the flat surface 42, on either side of slot 40 forming the end of the sleeve 30, terminates in a declivity 43, on the far side of which is a high barrier 44. The stud element 24 consists of a stud 45, having protuberances 49 at one end and a tapered head 47 with a bearing 48 at the other end, and a bushing 51, Fig. 12, having a flared seating portion 52 to engage a hole 23 in the other member 21 to be fastened. Beyond the seating portion 52 is a housing 53 and a narrower split neck 54. a snap ring 57, Fig. 3, in a groove 56 between the neck 54 and housing 53, preventing removal of the stud 45, the protuberances 39 passing through slots 55 in the narrower neck 54, a spring in the housing 60 tending to slide the stud outwards from the bushing. A snap ring 62, Fig. 3, in a recess 64 in hole 23 of member 21, has tongues for engaging channels 61 on the housing 53 to prevent removal of the stud element from, but permitting silding in, the member 21. To operate. With the holes 22 and 23 in member 20 and 21 registering the stud element is passed into the cylinder 25, then by pressing inwards upon and rotating, the stud 45 its protuberances 49 pass through the keyhole slot 40 and on to the flat surfaces 42, further rotation brings the protuberances 49 into the declivity 43 to abut the barrier 44, further rotation causes the sleeve 30 to rotate and draw the stud element into the socket element and hence the two members 20, 21 together. A final turn of the stud 45 causes a wedging action between the threads of the sleeve and housing to contact the sleeve causing the neck 54 to grip the stud shank 46. To release the fastening. Rotation of the stud in the reverse direction causes the protuberances 49 to abut a small wall 65 of the declivity 43 causing the sleeve 30 to rotate until the protuberances easily ride over the wall 65 and register with the keyhole slot 40, the spring 60 then retracts the stud element and so permits it to be completely withdrawn from the socket. In the fastened position the bearing 48 is partly in both members 20, 21 to resist any shear stresses due to attempted sliding of the two members.