JOHN M HOGAN
Engineers in Warrington, PA
License number
Pennsylvania PE021657E
Category
Engineers
Type
Professional Engineer
Address
Address
Warrington, PA 18976
Professional information
Tennis Training Apparatus
US Patent:
4460172, Jul 17, 1984
Filed:
Oct 13, 1981
Appl. No.:
6/310573
Inventors:
John M. Hogan - Warrington PA
International Classification:
A63B 6938
US Classification:
273 29A
Abstract:
An apparatus for practicing tennis strokes, especially ground strokes, provides a support for holding a tennis ball at an initial predetermined position while allowing for a rotation of this ball about a horizontal axis of the support, this horizontal axis support being allowed to move along a predetermined ideal longitudinal axis and being biased to return to its initial position, whereby an irregular stroking of the tennis ball results in a less than ideal operation of the apparatus which is readily detected.