Patent GB-663081-A (GB)
Title: Spools or bobbins
IPC: B65H75/14
Filed: 1948-07-17
Abstract: 663,081. Bobbins. MICA & MICANITE SUPPLIES, Ltd., and PARSONS, F. A. Aug. 17, 1949 [July 17. 1948; Dec. 14, 1948], Nos. 19249/48 and 32317/48. Class 120(iii) A bobbin comprises end discs and a hollow body of circular section having tongues which are slotted or slit over part of their peripheral length and which traverse slots of corresponding size in the end discs, so centreing the end discs upon the body, and the end discs are retained by bringing that part of each tongue which lies to the outside of the slot or slit in the tongue out of line with the corresponding slot in the end disc by relatively rotating the body and discs to form a bayonet joint, or by bending the said part of the tongue to one side, or by both methods, and applying permanent locking means coacting with every tongue to prevent the said part thereof from moving back into line with the slot. As shown, Fig. 2, tongues 2 of bayonet form on the core 1 are passed through slots 5 in an end disc 4 and the core turned to engage the bayonet joints; a locking disc 6 slotted at 7 is then secured to the end disc, e.g. by rivets, screws, adhesive, or welding, with slots 7 receiving tongues 2 and locking them against rotation. In another embodiment, Fig. 5, the tongues 2, which are slit at 9, are passed through slots 5 and the tongue ends are then bent outwards as shown, and a locking disc 6 having slots 11 conforming to the shape of the bent tongues is secured to disc 4. In each case the open parts of the slots may be filled with cement, to provide additional locking. In modified construction, the tongues do not project beyond the outer face of the end disc, the slots extending into recesses which permit the necessary sliding or bending of the tongues. The joints are locked by filling the open parts of the recesses and slots with cement. In further modifications, the body may be slit longitudinally so as to be slightly contractible, the slots in the end discs and locking discs being large enough to permit the necessary movement of the tongues during contraction; the body is held out to maximum diameter by its resilience or by internal C springs. A central spindle-receiving tube may be incorporated, the reduced ends of the tubes filling in the central holes 12, 13 in the end and locking discs 5 where a tapered spindle is to be used, one end of the bobbin may be bushed to receive the small end of the spindle. The central tube may project at the ends to provide pivots, or separate pivots may be secured to the bobbin ends. Additional means may be provided for holding the parts together, e.g. the ends of a central tube may be expanded or beaded over, or provided with screw threads receiving nuts outside the locking discs; or tie bars &c. may engage the end or locking discs and be located just inside the body. The end and locking discs may be slotted to receive lugs, the end disc being backed, inside the body, by a metal plate which locates the central tube. Steaming holes may be provided in the body of the bobbin and drainage holes in the ends. The bobbin may be made of metal, vulcanized fibre, or laminated paper or fabric bonded with synthetic resin. According to the second Provisional Specification, with a construction as in Fig. 5, bending of the tongues is not essential, tie rods, welding, adhesive, or a central tube being relied upon to hold the parts together.