Patent GB-731188-A (GB)
Title: Improvements relating to fastening devices
Inventor: RALPH ARTHUR HENRY
IPC: F16B5/10
Filed: 1952-12-16
Abstract: 731,188. Stud and socket fasteners. DZUS FASTENER EUROPE, Ltd. Dec. 16, 1953 [Dec. 16, 1952], No. 31871/52. Class 44. A fastening device for releasably securing together two articles or parts 3, 16, comprises a stud member 12 carried by one of the articles or parts 16 and a receptalce member 1 which is secured to the other article or part 3 and carries a resilient element 10 with which the stud member 12 can engage, engagement and disengagement of the two members being effected by partial rotation of the stud member in one direction or the other relatively to the receptacle member, relative axial movement between the parts when the fastener is in its locked position being positively prevented by a member 14 which, in the locked position of the fastener is in engagement both with the stud member 12 and with the receptacle member 1. The receptacle member 1 has a flange 2 by which it is secured to the part 3 and has a stud receiving bore 4 having at one end a counterbore 5 in which a pressure cup 6 is axially slidable. In the form shown the pressure cup 6 is urged away from the receptacle 1 by a pair of helical springs 9 and it is guided in its movement by two studs (not shown) which are fixed to the receptacle 1. The resilient member 10, which is an S-shaped spring, is riveted to the pressure cup 6 and extends diametrically across a stud-receiving bore 7 in it to engage a helical cam slot 11 in the stud 12. The part of the pressure cup within the counterbore 5 has a conical bore in which is disposed the member 14 which is an annular collar. This collar is split radially into three segments. The outer periphery of the collar is conical to engage the conical bore in the pressure cup and the segments are urged outwardly by a spring circlip 15 fitting in a groove in the inner periphery of the collar. The stud 12 is formed with a peripheral recess 19 in which the collar can engage and it is rotatably secured to the part 16 by a circlip 18. When the stud is in the bores 4 and 7 and is rotated, the pressure cup is drawn upwardly against the springs 9 by the engagement of the slot 11 with the spring 10 and by this movement the conical bore forces the segments of the collar inwardly against the pressure of the spring circlip 15 to enter the recess 19. The spring 10 drops into a pair of locking seats at the upper end of the slot 11 at the completion of the stud rotation and its axial movement is then prevented by the engagement of the upper part of the collar with the base of the counter-bore 5 and by the engagement of the lower part of the collar with a shoulder 20 on the stud formed by the recess 19. When the stud is rotated in the opposite direction the springs 9 and 15 move the various parts apart to allow the stud to disengage. In a modification the pressure cup is guided by ears which engage in slots in the wall of the counterbore 5, instead of by the use of studs and the springs 9 are omitted, the pressure of the spring circlip alone being used to move the collar segments and pressure cup to disengaged position.