Amusement devices: games – Surface projectile game; game element – Simulated game
Patent
1982-09-20
1984-11-20
Marlo, George J.
Amusement devices: games
Surface projectile game; game element
Simulated game
273DIG14, A63B 6936
Patent
active
044835361
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to the detection of self-movement and in a particular but by no means exclusive application affords sportsmen such as golfers a device by which they are able to detect sway of their body during execution of a stroke.
BACKGROUND ART
It is believed that one of a golfer's principal concerns in perfecting his technique should be to minimise the sideways sway of a notional pivot point in the upper part of his body as he executes the backward and forward swing prior to striking the ball. It is further believed that this theoretically perfect position entails substantially no sideways movement of the eyes during the course of the swing, or at least a consistent slight eye movement characteristic of the golfer. It will be understood that the term "sideways" is being applied in relation to the golfer's torso and corresponds to a fore-and-aft movement relative to the intended line of travel of the ball. It is an objective of this invention to provide a novel device for the detection of self-movement which is especially adaptable as a sway detector for use in golf practice.
DISCLOSURE OF THE INVENTION
The invention accordingly provides a device for detection of self-movement characterized by an optically convergent interface, substantially linear marker means, and positioning means to relatively position the interface and linear marker means so that the marker means extends away from said interface on the same side as the focus or focal line thereof, at least to a position P at which the virtual image of the linear marker means is significantly further displaced from said interface than is the position P in real space.
In a preferred embodiment, said interface is provided by a solid, relatively thin element constituting a lens separated, when in situ, from the marker means by air, and in that the position P is displaced in real space a distance from said interface preferably between 0.4f and f, most preferably between 0.4f and 0.6f, f being the focal length of the lens.
If, alternately, the medium between said interface and said linear marker means is substantially uniform, such as a solid block of substantially transparent material, e.g. perspex, the position P is displaced, in real space, a distance from said interface preferably between 0.4nf and nf, most preferably between 0.4nf and 0.6nf, where n is the refractive index of the medium and f is the focal length of said interface.
The aforesaid lens may be a strip of plastics material having at least one part-cylindrical surface inclined with respect to said marker means whereby the angle between the line of the marker means and the axis of the lens is between 40.degree. and 70.degree..
BRIEF DESCRIPTION OF DRAWINGS
The invention will be further described, by way of example only, with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of a device according to the invention, shown in the assembled condition ready for use by a golfer;
FIG. 2 is a view similar to that of FIG. 1, but showing the transportable condition of the device;
FIGS. 3A and 3B are front elevational views of the device as depicted in FIG. 1, demonstrating the operation of the device in detecting self-movement;
FIG. 4 is a cross-section on the line 4--4 in FIG. 3A;
FIG. 5 is a diagrammatic representation of an alternative device according to the invention; and
FIG. 6 schematically depicts a further, more complex device according to the invention.
MODES FOR CARRYING OUT THE INVENTION
The device 10 illustrated in FIGS. 1 to 4 includes a shallow base 12 having a bottom 11, side walls 13, 14, a front wall 15 and a partition 16 which together define a pair of internal chambers 18, 19 (FIG. 4). Rearward chamber 19, by far the larger of the two, is covered by a transparent plate 20 and so defines a pocket which is open at the rear end of base 12 to snugly receive, for storage, a lens element 22, as best seen in FIG. 2.
Lens element 22 is a relatively thin plate or strip of transparent material, such as for example polymethylmet
REFERENCES:
patent: 1556062 (1925-10-01), Baugh
patent: 2929631 (1960-03-01), Gillon
patent: 3000261 (1961-09-01), Frenkel
patent: 3468545 (1969-09-01), Anderson
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