Hand-muscle developer

• US 5,100,126 A
• Filed: 06/05/1991
• Issued: 03/31/1992
• Est. Priority Date: 06/05/1991
• Status: Expired due to Fees

• Current Assignee: Chien Hsing Liou
• Original Assignee: Chien Hsing Liou
• Inventors: Liou, Chien Hsing
• Primary Examiner(s): Bahr, Robert
• Assistant Examiner(s): Reichard, Lynne A.
• Application Number:
  US07/710,535
• Time in Patent Office: 300 Days
• Field of Search: 272/67, 272/135, 272/137, 272/139, 272/140, 272/142, 128/25 R, 128/77, 128/26
• US Class Current: 482/46
• CPC Class Codes: A63B 21/00069 Setting or adjusting the resistance level; Compensating for a preload prior to use, e.g. changing length of resistance or adjusting a valve
• CPC Class Codes: A63B 21/0455 having torsion element around its longitudinal axis
• CPC Class Codes: A63B 23/14 for wrist joints

Abstract

A hand-muscle developer, comprising a tubular base having a rocker arm pivotably connected thereto at one end by a pair of connecting plates and a pair of links with two pairs of torsional springs respectively retained therebetween. Operator'"'"'s hand is inserted through the tubular base to hold a cross bar on the rocker arm and to drive it to rotate back and forth. Rotating the tubular base causes the torsional springs to produce a resisting force against the applied force from operator'"'"'s hand and therefore, operator'"'"'s hand muscles are trained. Adjusting screws are provided for adjusting the tension of the torsional springs.

Claims

1. A hand-muscle developer, comprising:

a base comprised of two symmetrical rod portions longitudinally disposed at two opposite locations, a first arched wall portion connected between said two symmetrical rod portions at one end and a second arched wall portion connected between said two symmetrical rod portions at an opposite end and opposite side relative to said first arched wall portion, and two substantially U-shaped brackets respectively made on said two symmetrical rod portions at one end adjacent to said second arched wall portion, said U-shaped brackets having each a first connecting end at an upper end and a second connecting end at a lower end;

a rocker arm having a hand-hold transversely disposed at one end and two unitary, opposite connecting members at the bottom spaced from said hand-hole, said connecting members having each a first connecting end at one end respectively pivotably connected to the first connecting end on each of said U-shaped brackets and a second connected end at an opposite end;

a pair of connecting plates having each a first connecting end at one end respectively pivotably connected to the second connecting end on each of said U-shaped brackets and a second connecting end at an opposite end;

a pair of links having each a first connecting end at one end respectively pivotably connected to the second connecting end on each of said connecting plates and a second connecting end at an opposite end respectively pivotably connected to the second connecting end on each of said connecting member;

a first pair of torsional springs respectively retained between said two connecting members and said two U-shaped brackets;

a second pair of torsional springs respectively retained between said pair of connecting plates and said pair of links; and

a pair of adjusting screws respectively fastened in said pair of connecting members to control the tension of said second pair of torsional springs.

2. The hand-muscle developer of claim 1, wherein said rocker arm is pivotably connected to said base via said pair of connecting plates and said pair of links by rivets and C-shaped retainer rings so that it can be rotated on said base back and forth.

3. The hand-muscle developer of claim 1, wherein said rocker arm has two front projections with said hand-hold connected therebetween by lock screws for the holding of the hand to drive it to rotate on said base back and forth.

4. The hand-muscle developer of claim 1, wherein an operator'"'"'s hand is inserted through said first and second arched wall portions to hold said hand-hold and to drive it to rotate vertically downward so as to squeeze said first and second pairs of torsional springs causing said first and second pairs of torsional springs to produce a resisting force to force said hand-hold to move back to former position once applied force from operator'"'"'s hand is released therefrom.