Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1982-08-02
1988-01-12
Pinkham, Richard C.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
A63B 6100
Patent
active
047186690
ABSTRACT:
An electrically operated line monitor for tennis which uses one or more rays substantially smaller in effective cross-section than a tennis ball to monitor areas of a tennis court adjacent critical lines thereof. The rays pass over the playing surface of the court at a height lower than the height of a tennis ball. In various embodiments, a first ray which actuates a `good` signal on essentially complete interruption of its effective part travels over an area of the court in which a ball would strike if it were "good". The first ray travels essentially parallel to and in practice slightly distanced from a perpendicular from said critical line and is so positioned that a ball in play falling across the said `good` area towards the said critical line and which just completely interrupts the reception of the effective part of the said first ray must afterwards strike the said critical line. The said first ray is the nearest `good` ray to the perpendicular from the said critical line.
Further embodiments employ additional rays (referred to as further rays) and positioned slightly on either the inside or the outside of a perpendicular to the critical line depending on whether "good" or "fault" balls are to be monitored. The further rays are spaced progressively further from the perpendicular so that a ball in play striking the ground in a monitored area will interrupt the passage of at least one of the rays, thereby actuating a signal. In one of these embodiments, the first ray functions as a master ray to monitor the area just inside the perpendicular from the critical line. If the master ray is interrupted by the passage of a good ball which subsequently skids into the fault area, the master ray prevents any subsequent signal.
REFERENCES:
patent: 3370284 (1968-02-01), Bango
patent: 3415517 (1968-12-01), Kirst
patent: 3810148 (1974-05-01), Karsten
patent: 3854719 (1974-12-01), Supran
patent: 4004805 (1977-01-01), Chen
patent: 4375289 (1983-05-01), Schmall et al.
Electronic Design, Apr. 26, 1976, p. 20.
Carlton William C.
England Margaret P.
Brown T.
Pinkham Richard C.
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