Back to results
US 3,940,132 AGranted
Tennis service instructional device
OwnerJohn S. Lopatto, IIIinventor
Life of this patent
Estimating the term…
Abstract
In order to aid in the instructions of the service stroke in tennis, a tennis ball is releasably held by suction at the mouth of a suspended supple hose at the proper height to be stroked by a tennis racquet as in serving. The ball is easily released from the restraining force of the suction upon impact by the tennis racquet.
Claims5
An apparatus for use as an aid in learning the service stroke in tennis comprising,
- a substantially vertical overhead support,
- supple flexibly yieldable tubular means suspended from said support,
- said tubular means having a lower open end for seating against the uppermost portion of the surface of a tennis ball placed at a height above a player's head,
- and means for applying suction to the other end of said tubular means with a force which is just sufficient to maintain the weight of the ball in said open end but to be overcome to release the ball by impact of a racquet striking against the ball during a service stroke.
1 more element
Dependencies are inferred from the claim text.