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US 5,291,774 AGranted
Tennis ball tester
OwnerCharles E. Putnam, Jr.inventor
Life of this patent
Estimating the term…
Abstract
A means of testing used tennis balls by inserting them between a compression arm with a pressure point midway of the ball and a base with backstop which also engages the ball. The weighted compression arm is allowed to fall on the ball and a reading is obtained at the forward end of the tester to determine if the ball is playable, practicable or should be discarded.
Claims1
A tennis ball testing apparatus, comprising:
- a base (C), including an elongated horizontal bottom member, a vertically extending backstop 7 connected to a first end of the bottom member, and a pair of vertically extending housing members (9) having lower ends that are respectively connected to opposite sides of the bottom member adjacent to the second opposite end of the bottom member, each of said housing members including indicia (11) on the front of the respective housing members such that the indicia of both housing members are simultaneously viewable from a front of the apparatus, and a horizontally positioned connecting member (10) whose ends are respectively fixed to the upper ends of the housing members (9);
- and a compression arm assembly (B), including an elongated compression arm having a first end pivotally connected to the upper end of the backstop 7, a pair of horizontally extending indicator means (5) extending away from opposite sides of the compression arm adjacent to the second opposite end of the compression arm, said compression arm extending above the bottom member from the backstop (7) to a position passed the housing members, an arm lifter (6) coupled to the second end of the arm and projecting away from the arm towards the front of the apparatus, a weight (3) located on the upper surface of the compression arm, and a pressure member (1) attached to the lower surface of the compression arm adjacent the first end of the compression arm;
- whereby the backstop (7) comprises a means to permit consistent positioning of tennis balls to be tested between the pressure member (1) and upper surface of the bottom member;
- whereby said arm lifter (6) and said connecting member (10) together comprise a means to permit the compression arm to be raised away from the upper surface of the bottom member with a single operator hand;
- and whereby the indicator means and indicia of the front of the housing members together comprise a means to provide an indication of the condition of a tennis ball to be tested.
2 more elements
Dependencies are inferred from the claim text.