1978-07-12
1980-12-23
Pinkham, Richard C.
Undertaking
272 38, A63G 120
Patent
active
042406234
ABSTRACT:
A swing having a hydraulically actuated counterweight which returns to a rest position which has relatively low potential energy when said swing is unoccupied. In addition to this safety feature the swing seat is surrounded by a circular frame to protect the rider and bystanders from possible injury.
REFERENCES:
patent: 1987004 (1935-01-01), Eyerly
patent: 2723120 (1955-11-01), Hackleman
patent: 3152802 (1964-10-01), Heisler et al.
patent: 3298685 (1967-01-01), Williams
patent: 3321203 (1967-05-01), Hansen
patent: 3469837 (1969-09-01), Heilig
patent: 3885788 (1975-05-01), Harris
patent: 4018435 (1977-04-01), Howell
patent: 4032138 (1977-06-01), Willis
Space trainer, Hopkins Mfg. Corp., Dept. PP, 430 Peyton St., Emporid, Kan., Washington Star "Parade of Progress Section," Jan. 17, 1960, p. 13.
Kramer Arnold W.
Pinkham Richard C.
Weiss Harry M.
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