Device for determining swing speed of rotatable implements

• US 4,788,863 A
• Filed: 11/23/1987
• Issued: 12/06/1988
• Est. Priority Date: 11/29/1986
• Status: Expired due to Fees

• Current Assignee: Tanaka Manufacturing Company Limited
• Original Assignee: Tanaka Manufacturing Company Limited
• Inventors: Tanaka, Yoshihisa
• Primary Examiner(s): CHAPMAN JR, JOHN E
• Application Number:
  US07/124,205
• Time in Patent Office: 379 Days
• Field of Search: 73/493, 273/26 B, 273/186 A, 116/203, 116/223, 116/303, 200/61.45 M, 235/91 H
• US Class Current: 73/493
• CPC Class Codes: G01P 1/10 for indicating predetermined speeds
• CPC Class Codes: G01P 15/036 for indicating predetermined acceleration values
• CPC Class Codes: G01P 3/16 by using centrifugal forces of solid masses governors G05D13/10

Abstract

A device for determining swing speed of rotatable implements, for example human activated sporting goods such as a bat, a tennis racquet, etc. The device comprises a mounting base, a magnetically attractable arcuately movable member in the form of a metal plate, a stopper, the movable member upon activation coming into contact with the stopper to produce a hitting sound, a support member detachably supporting the movable member, and a rotatable disk magnet likewise supported by the support member, the movable member being rotatably movable through a rotational arcuate width between the stopper and the support member. The device further comprises a counter which may be contacted by the movable member to detect numerical frequency of rotations of the movable member.

Claims

1. A device for determining the swing speed of rotatable objects, comprising a mounting base, a magnetically attractable movable plate member, said movable plate member pivotally mounted at one end on said mounting base, a stopper provided in the path of said movable member at one rotational arcuate direction thereof, whereby said movable member may come into contact with the stopper to produce a hitting sound, a transversely movable support member which is set in the path of the other rotational arcuate direction of said movable member, said support member supporting a magnetized disk to which said movable member is detachably attracted, whereby upon presetting the magnetized disk may be moved in a transverse longitudinal direction, relative to the pivot of the movable member, said movable member having an arcuate limit of specific rotation between said stopper and said support member.

2. A device for deciding swing speed according to claim 1, including a lever actuated counter which comes into contact with the movable member to detect numerical frequency of rotations of the movable member.