Patents Assigned to R. J. Lasker
  • Patent number: 5222732
    Abstract: A device for teaching correct tennis stroke while swinging a tennis racket to hit a tennis ball. The device is comprised of a frame having a pair of spaced apart, triangular shaped side members. An elongated shaft is extended between the side members and has each end attached to a respective side member. A wheel is rotatably mounted on the shaft between the side members and above a ground support surface. Each side member has a configuration to allow the frame to be suspended on a support and above the ground support surface whereby the wheel will be freely rotatable on the shaft when struck by a tennis racket. The wheel is then struck with a glancing blow of a tennis racket during followthrough of the swinging motion of a trainee.
    Type: Grant
    Filed: September 27, 1991
    Date of Patent: June 29, 1993
    Assignee: R. J. Lasker
    Inventor: David M. Robey
  • Patent number: 5056785
    Abstract: The invention relate to a tennis stroke practice device wherein a shaft having a plurality of angular bends intermediate its end is provided with a handle attached to one of its ends and a wheel rotatably attached to its other end.The device has a size whereby a player can grasp the handle in one of his hands and a tennis racquet in his other hand and practice various tennis strokes by positioning the wheel at various positions relative to his body and strike the wheel with the tennis racquet.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: October 15, 1991
    Assignee: R. J. Lasker
    Inventor: David M. Robey