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Publication numberUS3922741 A
Publication typeGrant
Publication dateDec 2, 1975
Filing dateJan 9, 1974
Priority dateJan 9, 1973
Also published asDE2363446A1, DE2363446C2
Publication numberUS 3922741 A, US 3922741A, US-A-3922741, US3922741 A, US3922741A
InventorsSemeia Roberto
Original AssigneeAmf Mares Sub Spa
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Composite swim fins
US 3922741 A
Abstract
A swim fin including a scoop member made from a stiff plastic material molded to a shoe member made from a soft synthetic elastomer, the scoop member having a planar portion forming a half-sole for the shoe; projections, recesses and apertures being formed on the scoop member for providing an additional mechanical bond between the scoop member and the shoe member.
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Description  (OCR text may contain errors)

Unlted States Patent 1 [1 11 3,922,741

Semeia 1 Dec. 2, 1975 [54] COMPOSITE SWIM FINS 3,302,223 2/l967 Ciccotelli 9/309 3,344,449 10/1967 Grilli 9/309 [751 Invent: Rapano, Italy 3,522,345 7/1970 Bent-eve Olsen 425/129 5 [73] Assignee: AMF Mares Sub S.p.A., Rapallo,

Italy Primary ExaminerTrygve M. Blix [22] Filed: Jan. 9, 1974 Assistant Examiner-Charles E. Frankfort Attorney, Agent, or Firm.lames G. OBoyle [21] Appl. No.: 431,693

[30] Foreign Application Priority Data [57] ABSTRACT Jan. 9, 1973 Italy 12405/73 A swim fin including a scoop member made from a stiff plastic material molded to a shoe member made [52] US. Cl 9/309; 425/129 from a 50ft ynthetic elastomer, the scoop member [51] Int. GL2 A63B 31/10 having a planar portion forming a half-sole for the Field of Search 9/ shoe; projections, recesses and apertures being formed 425/129 5 on the scoop member for providing an additional mechanical bond between the scoop member and the [56] References Cited shoe member.

UNITED STATES PATENTS Ferraro 9/309 2 Claims, 8 Drawing Figures Sheet 1 of4 US. Patent Dec. 2, 1975 Sheet 2 of 4 3,922,741

U.S. Patent Dec. 2, 1975 US. Patent Dec. 2, 1975 Sheet 3 Of4 3,922,741

US. Patent Dec. 2, 1975 Sheet4 of4 3,922,741 v fcoMrosnE SWIM FINUS' BACKGROUND OF THE INVENTION The present invention relates to swim fins of the kind comprisinga shoe portion and a scoop portionintegr'al therewith. It is known that in order to achieve the best propulsionres ults in a swim fin it is necessary that the scoop portion be relatively rigid and elastic, whilst the shoe portion should have a certain flexibility and pliability in order that it may adapt itself to the foot without exerting any kind of abrasive friction on the foot.

These different requirements cannot be satisfied by manufacturing the shoe and scoop portions of the swin fin of the same material.

It has been proposed, as shown for instance from the US. Pat. No. 3,302,222, to produce separately the shoe portion and the scoop portion from different materials, providing the said portions with complementary coupling means for interconnecting the said portions.

A composite swim fin of the kind disclosed in the above mentioned Patent is difficult to be produced due to the difficulty of providing it with the complementary coupling means; it requires a subsequent assembly step of the two parts of the fin, and is therefore costly.

It is therefore the main object of the present invention to obviate to the drawbacks of the prior art fins of the kind comprising a shoe portion made of a material different from that of the scoop portion.

SUMMARY OF THE INVENTION According to the invention, a swim fin is provided comprising a scoop member made from a relatively stiff plastics material, and a shoe member made from a relatively soft synthetic elastomer, the said shoe member being moulded directly on the said scoop member, the said scoop member being provided at the junction areas with the shoe member with projections, recesses and/or through passages for providing an additional mechanical bond between the scoop member and the shoe member being moulded on it.

Further features and advantages of the swim fin of the invention will be disclosed in the detailed description thereof which is given hereinbelow with reference to the accompanying drawings showing a preferred embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal section through a swim fin according to the invention.

FIG. 2 is a longitudinal sectional view of the rear portion of the scoop member of the swim fin according to the invention.

FIG. 3 is a top plan view of the rear portion of the scoop member of FIG. 2.

FIG. 4 is an enlarged perspective view of the particular of one of the side webs of the rear end of the scoop member.

FIGS. 5 and 6 are vertical sections taken along the lines V-V and VIVI of FIG. 2, before the moulding of the shoe member on the scoop member.

FIGS. 7 and 8 are vertical sections corresponding to FIGS. 5 and 6, after the moulding of the shoe member on the scoop member of the swim fin.

DESCRIPTION OF THE INVENTION The swim fin shown in FIG. 1 comprises a scoop portion 1, made from relatively stiff plastics material, and

forinstance from Ethylene-Vinylacetate copolimer and a shoe portion 2 made from a relatively soft rubberlike material, and particularly from a mixture of a copolymer ofethylene-vinylacetate and thermoplastic rubber, which shoe portion is moulded, for instance by an injection moulding process, on the previously formed scoop portion, so as firmly adhere to it.

The shoe portion isprovided, at the toe end with an aperture for the passage of the toes, whilst at the heel end it is provided with a pull-on strap 3.

The rear end portion 4 of the scoop member 1 is formed as a sole for the shoe member 2, and extends for about the half of the length of this member. The rear edge 6 of the terminal portion 4 of the scoop member 1 is V shaped, as clearly shown in FIG. 3. The scoop member 1 is further provided with longitudinally extending side webs 5, the height of which is increasing toward the rear end of the scoop member. In the rear portion of the scoop member 1, the side webs 5 extend upwardly from the terminal portion 4 of the scoop member 1, so as to laterally surround the shoe member 2, to which they become firmly bonded during the moulding of the shoe member 2 on the scoop member 1.

At the front zone of the rear portion 4 of the scoop member 1 a recess 7 is formed. At the rear edge 6 of the scoop member 1 a number of upwardly projecting pin-like members 8 are integrally formed. During the moulding of the shoe member 2, the moulded shoe material penetrates the recess 7, whilst the projections 8 are embedded into the material of the shoe member. In this manner, in addition to the welded bond between the scoop member and the moulded shoe member, an additional mechanical bond is provided between the said parts.

The side webs 5 of the scoop member 1 are provided at their upper end with an inwardly projecting rim 9. The upper comer portion 10 of the side webs 5 is stepped down, and at this corner an oblique opening 11 is formed in the side webs 5. At a position slightly in advance of the said opening 11, a vertical boring 12 is formed through the rim 9, as shown in FIGS. 3 to 6.

The shoe member is moulded on the scoop member 1 in such a manner as to rest under the rim 9, and to cover the stepped-down comer portion 10 of the side webs 5. The material of the shoe portion 2 fills the lateral openings 11 and the vertical borings 12, as clearly shown in FIGS. 7 and 8. In this manner at the corner portions 10 of the side webs 5 a particularly firm bond between the scoop member and the shoe member is obtained. The rear portion of the shoe member, which freely projects from the scoop member 1 joins laterally and at its bottom flush with the scoop member 1. Of course, the said shoe member may be moulded on the scoop member so as to partially overlap the scoop member at the junction edges.

Having thus described my invention, I claim:

1. A swim fin comprising a scoop member made from a relatively stiff plastic material molded to a shoe member made from a relatively soft synthetic elastomer, said scoop member having two side webs laterally surrounding at least the fore end of the shoe member, the upper edge of each side web having an inwardly extending rim, said side webs having at least one side opening and at least one vertical bore passing through the side webs upper rim through which the molded shoe material on the outer surface of the shoe side wall penetrates, said scoop member having a planar portion the projections thereon are embedded into said lower surface of the shoe sole, thereby providing an additional mechanical bond between the scoop member and the shoe member.

2. A swim fin according to claim 1, in which the shoe member is moulded on the scoop member so as to partially overlap the scoop member at the junction edges.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3302222 *Nov 30, 1964Feb 7, 1967Luigi FerraroSwimming flipper
US3302223 *Mar 26, 1965Feb 7, 1967Samuel Ciccotelli StephenSwim-fin
US3344449 *Jun 10, 1966Oct 3, 1967Chloe GrilliSwimming device of mermaid shape
US3522345 *Oct 23, 1967Jul 28, 1970Bent Ove OlsenPremade heel unit for shoes and a method of making the same
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4887985 *Feb 3, 1988Dec 19, 1989Amf IncorporatedSwim fin provided with a self-shaping, fluid flow conveying and controlling canal-like member
US4954111 *Oct 28, 1988Sep 4, 1990Cressi-Sub S.P.A.Swimming flipper made of two different materials
US4954112 *Mar 30, 1989Sep 4, 1990Giovanni NegriniFlipper for flipper swimming
US5163859 *Jan 11, 1991Nov 17, 1992Technisub S.P.A.Rigid thermoplastic and soft elastomer
US5266062 *Jul 28, 1992Nov 30, 1993John L. Runckel TrustAmphibious footwear
US5273469 *Mar 6, 1992Dec 28, 1993Lueschen Jeffrey DComposite swim fin with cantilevered heel
US5290194 *Apr 16, 1993Mar 1, 1994KranscoSwim fin with differential stiffness characteristics
US5387145 *Jul 7, 1993Feb 7, 1995Wagner; John L.Swim fins
US5522748 *May 19, 1995Jun 4, 1996Cressi Sub S.P.A.Flipper for swimming and production method
US5588890 *May 10, 1995Dec 31, 1996Htm Sport S.P.A.Swimming fin
US5595518 *Apr 19, 1993Jan 21, 1997Ours; RogerFin device, in particular for water sports, and method of manufacture of such a device
US5683279 *Nov 16, 1995Nov 4, 1997Dacor CorporationMulti-part diving fin
US5702277 *Apr 10, 1996Dec 30, 1997Wagner; John LeeHigh performance swim fin
US5746631 *Jan 11, 1996May 5, 1998Mccarthy; Peter T.High efficiency hydrofoil and swim fin designs
US6095879 *May 13, 1999Aug 1, 2000Mccarthy; Peter T.Methods for creating consistent large scale blade deflections
US6146224 *May 18, 1999Nov 14, 2000Mccarthy; Peter T.High efficiency hydrofoil and swim fin designs
US6322412 *Feb 23, 2001Nov 27, 2001Htm Sport S.P.A.Swimming flipper with interchangeable blade
US6371821Nov 14, 2000Apr 16, 2002Nature's Wing Fin Designs, LlcHigh efficiency hydrofoil and swim fin designs
US6413133Aug 1, 2000Jul 2, 2002Mccarthy Peter T.Methods for creating consistent large scale blade deflections
US6482059Feb 1, 2001Nov 19, 2002Mccarthy Peter T.High efficiency hydrofoil and swim fin designs
US6497597Mar 5, 2002Dec 24, 2002Mccarthy Peter T.High efficiency hydrofoil and swim fin designs
US6585548Jan 4, 2002Jul 1, 2003Mccarthy Peter T.High efficiency hydrofoil and swim fin designs
US6607411Jan 4, 2002Aug 19, 2003Mccarthy Peter T.High efficiency hydrofoil and swim fin designs
US6712656Dec 28, 2001Mar 30, 2004Mccarthy Peter T.Methods for creating consistent large scale blade deflections
US6719599Nov 19, 2002Apr 13, 2004Mccarthy Peter T.High efficiency hydrofoil and swim fin designs
US6843693May 9, 2001Jan 18, 2005Mccarthy Peter T.Methods for creating large scale focused blade deflections
US6884134Jul 18, 2003Apr 26, 2005Mccarthy Peter T.High deflection hydrofoils and swim fins
US6918805Jan 22, 2004Jul 19, 2005Mccarthy Peter T.Methods for creating consistent large scale blade deflections
US6979241 *Aug 6, 2002Dec 27, 2005ZoomersSwim training fin
US7018256Jun 25, 2004Mar 28, 2006Mccarthy Peter TMethods for creating large scale focused blade deflections
US7101240Nov 13, 2003Sep 5, 2006Mccarthy Peter THigh efficiency hydrofoil and swim fin designs
US7465205Jul 19, 2006Dec 16, 2008Mccarthy Peter TMethods for creating consistent large scale blade deflections
US7581997Sep 5, 2007Sep 1, 2009Mccarthy Peter TMethod for creating consistent large scale blade deflections
US7601041Aug 21, 2006Oct 13, 2009Mccarthy Peter THigh deflection hydrofoils and swim fins
US7862395Sep 7, 2007Jan 4, 2011Mccarthy Peter TMethods for creating consistent large scale blade deflections
US8641464Apr 7, 2011Feb 4, 2014Cetatek Holdings Inc.Flippers, boots, systems including same, and methods of using same
WO1997018014A1 *Nov 15, 1996May 22, 1997Dacor CorpMulti-part diving fin
Classifications
U.S. Classification441/64, 425/129.1
International ClassificationA63B31/11, A63B31/00
Cooperative ClassificationA63B31/11, A63B2031/112
European ClassificationA63B31/11
Legal Events
DateCodeEventDescription
Oct 12, 1994ASAssignment
Owner name: HTM SPORT S.P.A., ITALY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUMITOMO BANK, LIMITED, THE;REEL/FRAME:007166/0759
Effective date: 19940927
Oct 12, 1994AS02Assignment of assignor's interest
Owner name: HTM SPORT S.P.A. VIA CERISOLA BORGHETTO 37, ITALY-
Effective date: 19940927
Owner name: SUMITOMO BANK, LIMITED, THE
May 22, 1989ASAssignment
Owner name: SUMITOMO BANK, LIMITED, THE, A COMPANY OF JAPAN, J
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMF MARES S.P.A., AN ITALIAN CORP.;REEL/FRAME:005077/0511
Effective date: 19890331
May 22, 1989AS02Assignment of assignor's interest
Owner name: AMF MARES S.P.A., AN ITALIAN CORP.
Owner name: SUMITOMO BANK, LIMITED, THE, 3-2, MARUNOUCHI, 1-CH
Effective date: 19890331