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1. 发明专利

GB749204A Improvements in swimming fins 未知
公开(公告)号：GB749204A
公开(公告)日：1956-05-23
申请号：GB2539453
申请日：1953-09-14
申请人： JOHN CALDWELL TANNOCK
发明人： TANNOCK JOHN CALDWELL , SHAW LEONARD HENRY
IPC分类号： A63B31/11
摘要： 749,204. Swim-fins. TANNOCK, J. C. May 4, 1954 [Sept. 14, 1953; Oct. 15. 1953; Jan. 8, 1954], Nos. 25394/53, 28529/53 and 626/54. Class 77 The fin portion of a swim-fin is moulded of thermo-plastic material of such stiffness and resilence that when a wearer of the fin walks in air at a speed between one and four miles per hour the fin portion becomes bent as the wearer's weight is transferred to the toe of the foot in the action of walking, and does not return from its bent shape to its flat shape in less than two seconds which is sufficient time for the wearer to return that foot to the ground again. The fin shown comprises a fin-portion 10 having integrally moulded therewith a bridge-piece 11 and toe-engaging pillar 12 together with a separately formed, adjustable foot encircling strap 13 and a separately formed adjustable ankle strap 14. The fin 10 is formed with ribs 18, 19, 20, 21, 22, edged with beading 31. and provided with two openings 23, 24 beneath the bridge-piece. Slots 25, 26, 27, 28, 29, and notches 32, 33, at the inner edges of openings 23, 24, respectively, for the reception of strap 13, are provided in the bridge-piece 11 and fin 10. Slots 34, 35, are formed in the bridge-piece for the reception of strap 14. The fin is fitted to the foot as shown in Fig. 6 the strap 13 being passed through slots 25, 27, 29, 28, or 25, 27, 33, 32, or 26, 27, 29, 28, depending upon the size of the wearer's foot. The strap 13 is buckled by engaging a head portion 37 formed at one of its ends with one of a series of slots 38 formed at its other end. Slots 38 are formed at both ends of strap 14 and for connection to the slots 34, 35, connecting links 41 comprising head portions 43, 44 and strap portion 42 (Figs. 11. 12), are used each link being passed through a slot 38 and either slot 34 or 35. The thermo-plastic material may be polyvinyl chloride having a British Standard hardness of between 3 and 40. Polyethylene having the required properties may also be used. Specification 749,221 is referred to.

2. 发明专利

GB749221A Improvements in swimming fins 未知
公开(公告)号：GB749221A
公开(公告)日：1956-05-23
申请号：GB1300254
申请日：1953-09-14
申请人： JOHN CALDWELL TANNOCK
发明人： TANNOCK JOHN CALDWELL , SHAW LEONARD HENRY
IPC分类号： A63B31/11
摘要： 749,221. Swim-fins. TANNOCK J. C. May 4, 1954 [Sept. 14, 1953; Oct. 15. 1953; Jan. 8. 1954], Nos. 13002/54. 13003/54 and 13004/54. Divided out of 749,204. Class 77 In a swim-fin comprising a fin portion, stop means for limiting forward movement of the foot over the fin portion and attachment means engaging the foot or ankle to restrain separating movement between the foot and the stop means, a bridge-piece of flexible material defines with tne nn portion an open-ended pocket for the reception of the wearer's toe3 and/or adjacent part of the foot. and the stop means comprises a pillar or pin or the like projecting between the bridgepiece and the fin portion to be received between the great toe and the adjacent .toe when the swim-fin is worn. The fin shown comprises a fin portion 10 having integrally moulded therewith a bridgepiece 11 and toe-engaging pillar 12 together with a separately formed adjustable foot encircling strap 13 and a separateiy formed adjustable ankle strap 14. The fin 10 is formed with ribs 18, 19, 20, 21, 22, edged with beading 31, and provided with two openings 23, 24, beneath the bridge-piece. Slots 25, 26, 27, 28, 29, and notches 32, 33, at the inner edges of openings 23, 24, respectively, for the reception of strap 13, are provided in the bridge-piece 11 and fin 10. Slots 34, 35, are formed in the bridge-piece for the reception of strap 14. The hn is fitted to the foot as shown in Fig. 6 the strap 13 being passed through slots 25, 27, 29, 28 or 25, 27, 33, 32, or 26, 27, 29, 28, depending upon the size of the wearer's foot. The strap 13 is buckled by engaging a head portion 37 formed at one of its ends with one of a series of slots 38 formed at its other end. Slots 38 are formed at both ends of strap 14 and for connection to the slots 34, 35, connecting links 41 comprising head portions 43, 44 and strap portion 42 (Figs. 11, 12) are used each link being passed through a slot 38 and either slot 34 or 35. The fin portion 10 may be moulded of thermo-plastic material of such stiffness and resilience that when a wearer of the fin wa:ks in air at a speed between one and four miles per hour the fin portion becomes bent as the wearer's weight is transferred to the toe of the foot in the action of walking, and does not return from its bent shape to its flat shape in less than two seconds which is sufficient time for the wearer to return that foot to the ground again. The thermo-plastic material may be polyvinyl chloride having a British Standard hardness of be- .tween 3 and 40. Polyethylene having the required properties may also be used. In a modified fin the fin portion may comprise metal strengthening ribs either embedded between two sheets of thermoplastic material or moulded within a single sheet. Specification 749,204 is referred to.

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