Undertaking
Patent
1989-11-15
1991-11-12
Crow, Stephen R.
Undertaking
272141, A63B 2100
Patent
active
050641891
ABSTRACT:
A gymnastic apparatus capable of generating a harmonic resistance to an exerciser comprises mainly an elongated guiding screw rod and a transverse shaft. The guiding screw rod comprises thereon a moving block capable of moving along the screw thread of the guiding screw rod to compress the coiled spring. The moving block includes a straight rod having a collision element arranged at each end thereof for the purpose of triggering the rocking levers of the reversing members. The transverse shaft is composed of two sliding blocks pivotally and respectively arranged on two spline sleeves. Located at one end of the spline sleeve is a clutch member, which engages with the bevel wheel so as to enable the bevel wheel to drive the guiding screw rod. At the outset, an exerciser's reciprocating motion of driving two rowing arms actuates the transverse shaft to turn in one direction so as to initiate the rotation of the guiding screw rod, which in turn triggers the moving block to move along the screw thread of the guiding screw rod to compress the coiled spring until such time when the intensity of recoil force of the compressed spring has reached a predetermined maximum degree. Thereafter, the reversing members are triggered by collision elements of the straight rod to alter the direction, in which the guiding screw rod rotates, to bring about the retreat of the moving block to release the compressed spring until the reversing members are activated again. Therefore, the reciprocating actions of compressing and decompressing the coiled spring result in a cyclic generation of a harmonic resistance to an exercier's hands.
REFERENCES:
patent: 4541627 (1985-09-01), MacLean et al.
patent: 4583731 (1986-04-01), Crivello et al.
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