Buoys – rafts – and aquatic devices – Water skimming or walking device – Surfboard
Patent
1988-09-16
1991-02-26
Peters, Jr., Joseph F.
Buoys, rafts, and aquatic devices
Water skimming or walking device
Surfboard
441 79, A63C 1500
Patent
active
049958437
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a surfboard, the aft region of which has underneath a vertically narrow flexible tongue, of which the bending-up range is limited by an elastic device, and has covering material on top.
The property of such a board is that, when it moves straight ahead, when the surfer's weight is partially absorbed by his arms because of the leaning posture, it (substantially) maintains its originally predetermined shape, but during turning, when the surfer can exert more pressure on the board, the aft of the board bends up, thus making turning easier.
In a known board of this type (U.S. Pat. No. 3,902,207), the elastic device is a two-armed lever which has a fulcrum fixed to the board and of which one arm is supported on the tongue and the other arm on an elastic stop element acting in the vertical direction. This device is relatively complicated and takes up considerable space in the vertical direction.
The object on which the invention is based is to design the surfboard defined in the introduction, in such a way that it is made simpler than the known surfboard and takes up less space in the vertical direction.
According to the invention, this object is achieved by means of two stays which are arranged in succession in the longitudinal direction of the surfboard and of which that at the rear is fastened to the tongue and that at the front is located in the region of the front tongue end or preceding this, and by means of a stringer which is intrinsically elastic in the longitudinal direction of the board or is mounted elastically and which is arranged between the twso stays.
The design according to the invention, in comparison with the knwon design, is characterized by greater simplicity and less space required in the vertical direction.
In a further development of the invention, the space above the tongue is filled with highly elastic material. This affords, among other things, the advantage that the surfer's feet are cushioned, giving him a pleasant feeling.
It is also proposed that there be underneath the stringer plinths which are fixed to the tongue or fixed to the stringer and which end at a short distance from the stringer or tongue. This ensures that a bending of the tongue is limited in the downward direction.
It is expedient furthermore if there are springs between the tongue and the stringer, which springs are preferably adjustable in relation to the spring characteristic. This measure serves to influence the bending line of the tongue when the latter bends upwards or downwards.
Further details of the invention emerge from the drawing. In this:
FIG. 1 shows a section through a first embodiment of the invention along the line II--II of FIG. 2,
FIG. 2 shows a plan view of this first embodiment,
FIG. 3 shows a detail in a vertical section,
FIG. 4 shows a section through a second embodiment of the invention along the line IV--IV of FIG. 5,
FIG. 5 shows a plan view of this second embodiment,
FIG. 6 shows a section through a third embodiment of the invention along the line VI--VI of FIG. 7, and
FIG. 7 shows a plan of this third embodiment.
FIGS. 1 and 2 show the aft end of a surfboard according to the invention. This comprises a tongue 1, two stays 2 and 3, a strigner 4 clamped between the stays 2 and 3, an elastic buffer 5 between the stringer 4 and the stay 2, highly elastic filling material 6 above the tongue. 1 (the material is omitted in FIG. 2), and loops 7 and 8 for holding the surfer's feet. The elastic filling material 6 is preferably a foam in which at least the outer pores of the foam are closed. The stringer 4 is mounted so as to be longitudinally displaceable relative to the stay 2 via a bolt 9 which is inserted into slots 10 of two brackets 11 fixed to the stay. The stringer 4 is supported, via a plate 12, on the rubber buffer 5 which itself rests against the stay 2 by means of its front end. The rubber buffer 5 thus ensures an elastic mounting of the stringer 4 in the longitudinal direction of the board
FIG. 3 shows this mounting in detail. A screw 13 passes through the rubb
REFERENCES:
patent: 3902207 (1975-09-01), Tinkler et al.
patent: 3988794 (1976-11-01), Tinkler et al.
Peters Jr. Joseph F.
Stone Mark P.
Swinehart Edwin L.
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