Patent GB-728603-A (GB)
Title: Improvements in or relating to fastening devices
Inventor: LANE ARTHUR HAMPTON
IPC: F16B2/06
Filed: 1952-05-08
Abstract: 728,603. Band clips. ROTOL, Ltd. June 12,1953 [May 8, 1952], No. 11711/52. Class 44. A device for fastening two members together comprises a flanged element adapted to be carried by one of the members, a ring or disc having a castellated outer peripheral edge adapted to be carried by the other member, a contractible split sleeve surrounding and rotatably mounted on the flange of the flanged element and having an inwardly directed castellated flange axially spaced from the flanged element, the castellations on the ring or disc being dimensioned and located to pass between the sleeve flange castellations and to lie axially between the sleeve flange castellations and the flange of the flanged element on appropriate rotational adjustment of the sleeve, means for contracting the sleeve, and means to cause the sleeve to move axially relative to the flanged element when the sleeve is contracted to lock the ring or disc between the sleeve flange castellations and the flange of the flanged element. In the arrangement shown in Figs. 1 and 6, in which a flanged element 5 is secured to a gear box 35 and in which an accessory is to be mounted on the gear box and to be driven thereby, a ring 7 carrying the accessory is formed with castellations 12 which are complementary to spaces between teeth 10 formed on an outwardly directed flange 8 of the element 5. The inner portion of the ring 7 lies within a cross limb of a T-section inner edge of the element 5 with the interposition of a sealing ring 37. The assembled flange and ring is surrounded by a split sleeve 13 formed with lugs 15, 16, an inwardly directed shoulder 17 and a castellated flange 18 corresponding to the castellations 12, whereby upon rotational adjustment of the sleeve, the ring 7 may be passed through the flange 18 for engagement with the flange 8 of the element 5. A conical face 11 of the flange 8 and the shoulder 17 provide abutting surfaces for a spring split ring 21. A threaded bolt 22 pivoted on the lug 15 carrying a collar 23 co-operates with a cavity on the lug 16 whereby the bolt may be tensioned to contract the sleeve 13. A projection 24 on the bolt 22 is adapted to enter a slot 25 in the element 5. In the full line position, Fig. 1. a projection 26 on the collar 23 engages a slot 42 in a spring loaded sleeve 27 which is formed with an internally threaded nut 29 for engagement with the bolt 22. The nut 29 is formed with an externally splined shoulder which engages with corresponding internal splines on the sleeve 27, the arrangement being such that application of a box spanner to nut 29, displaces the sleeve 27 to allow rotation of the nut to contract the sleeve 13. The nut is prevented from complete withdrawal by a circlip on the end of the bolt 22 and a shoulder on the sleeve 27, prevents its outward movement beyond the splines. In a modification, Fig. 4, a lug is provided on each projection 26 which co-operates with a circlip 45 for a seating 44 on the sleeve 27 to prevent separation of the sleeve 27 and collar 23. The device is assembled by placing sleeve 13 in position on element 5, the ring 21 is sprung into place and the assembly is secured to the gear box, with the nut 29 in its most accessible position. The accessory with the ring 7 attached, is presented to the element 5, the sleeve 13 being adjusted so that the castellations 18 overlie the castellations 12. The bolt 22 is brought to the full line position of Fig. 1 and the nut 29 tightened to contract the sleeve 13 and to move it axially due to the inclined surfaces 11, 19. An oil passage is provided between the gear box and the accessory Fig. 6.