Mechanical guns and projectors – Centrifugal – Mechanical
Patent
1973-04-27
1977-04-05
Pinkham, Richard C.
Mechanical guns and projectors
Centrifugal
Mechanical
124 50, 124 41R, 124 36, 124 80, 280 43, F41B 304
Patent
active
040155781
ABSTRACT:
A portable, self-contained tennis ball throwing apparatus is disclosed which includes a constantly rotating cam having gradually increasing radii of successive points around its periphery and an abrupt transition from a maximum radius to a minimum radius, a pivotally mounted throwing arm having one end biased into contact with the periphery of the cam and supporting a ball receiving cup at its other end, and a resilient member for biasing the throwing arm, such that the cam effectively cocks the throwing arm at a relatively slow rate and releases the throwing arm to move under the influence of the resilient member to impart a throwing force to a tennis ball. The housing of the apparatus is mounted on a carriage which is movable with respect to the housing to change the pitch angle thereof, and, therefore, the angle of trajectory of a thrown ball. The ball receiving cup is also adjustable to change the angle of trajectory of the thrown ball. An adjustable anchoring arm is provided for the resilient member and permits adjustment of the tension applied to the throwing arm. A gravity feed ball hopper feeds a ball release mechanism which is actuated by the throwing arm once during each throwing cycle to release one ball at a time onto the ball receiving cup.
REFERENCES:
patent: 1295069 (1919-02-01), Rouen
patent: 1912360 (1973-06-01), Blanchard
patent: 2057599 (1936-10-01), Serrano
patent: 2767985 (1956-10-01), Maxcey et al.
patent: 2836430 (1958-05-01), Langenbacher
patent: 2878801 (1959-03-01), Patchin et al.
patent: 2908266 (1959-10-01), Cooper
patent: 3470859 (1969-10-01), Ponza
patent: 3695247 (1972-10-01), Tucker et al.
Browne William R.
Pinkham Richard C.
Wiseman Jack M.
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