| CPC A63B 21/00069 (2013.01) [A63B 21/023 (2013.01); A63B 21/4035 (2015.10); A63B 23/16 (2013.01)] | 18 Claims |
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1. A hand grip strengthener, comprising:
a first operation arm;
a second operation arm;
a strength adjustment assembly comprising a spring element, a spring driving element, and an adjustment control element, wherein said spring element is arranged to generate a resistance force to the relative movement between said first operation arm and said second operation arm, wherein when said adjustment control element is operated by the user, said spring driving element is driven to move, so as to drive said spring element to move to adjust the resistance force, wherein said adjustment control element comprises an adjusting knob and a driving shaft coupled to said adjusting knob, wherein said spring driving element comprises a moving member which is screwed on said driving shaft in a manner that when said adjusting knob is rotated, said driving shaft is rotating to drive said moving member to move, so as to drive said spring element to move;
a scale display element comprising a base arm and a plurality of resistance level scales provided on said base arm; and
an indication element which is arranged to be driven by said moving member to move along with the movement of said spring driving element, so as to be selectively aligned with said plurality of resistance level scales;
wherein said base arm comprises:
a channel for receiving said moving member therein in a slidably movable manner; and
an elongated window, which is a through window, extended along a length of said base arm to communicate with said channel, wherein said indication element is moved and displayed along said elongated window to precisely indicate a movement of said moving member along said channel so as to precisely align said indication element with one of said resistance level scales.
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