The present invention relates to a hand gripper including a first arm, a second arm, a pair of spring members, a first spring member coupling shaft, and a second spring member coupling shaft, wherein a plurality of first elastic force adjusting grooves and a plurality of second elastic force adjusting grooves, to which the first spring member coupling shaft and the second spring member coupling shaft are selectively coupled, respectively, to adjust strength of elastic force provided by the spring members, are formed in a first body of the first arm and a second body of the second arm, respectively.
1. A hand gripper comprising:
a first arm including a first body and a first grip portion;
a second arm including a second body and a second grip portion, wherein an upper end portion of the second body is rotatably connected to an upper end portion of the first body;
a pair of spring members symmetrically provided on front and rear surfaces of the first and second bodies, each of the spring members including a first compression spring, first spring supports and second spring supports by which the first compression spring interposed therebetween is compressibly supported;
a first spring member coupling shaft through which the first spring supports are connected to each other and which is supported by the first body; and
a second spring member coupling shaft through which the second spring supports are connected to each other and which is supported by the second body;
wherein a plurality of first elastic force adjusting grooves and a plurality of second elastic force adjusting grooves, to which the first spring member coupling shaft and the second spring member coupling shaft are selectively coupled, respectively, to adjust strength of elastic force provided by the spring members, are formed in the first body and the second body, respectively.
2. The hand gripper of claim 1 , wherein:
a through-hole through which the first spring member coupling shaft passes is formed in the first body; and
the plurality of first elastic force adjusting grooves to which the first spring member coupling shaft is coupled are formed in an inner side surface of the through-hole.
3. The hand gripper of claim 2 , wherein the plurality of second elastic force adjusting grooves are provided in one outer side surface of the second body opposite to the plurality of first elastic force adjusting grooves.
4. The hand gripper of claim 1 , wherein:
the second body includes front and rear connecting plates which are disposed with the upper end portion of the first body interposed therebetween, coupled to the second body, and coupled to the first body by a rotation shaft;
a stopper, which is interposed between the front and rear connecting plates to be rotatably coupled by a hinge shaft and has a contact surface in contact with a contact portion formed on the upper end portion of the first body, is provided on an upper surface of the second body;
a plurality of stopper fixing grooves are formed in a lower surface of the stopper;
a support member coupled to the stopper fixing groove by an elastic force of a second compression spring is disposed on an upper portion of the second body which corresponds to the stopper fixing groove; and
a plurality of grooves are formed on the contact portion to which the contact surface of the stopper is selectively coupled.
5. The hand gripper of claim 1 , wherein:
each of the first body and the second body includes a plate-shaped coupling portion extending downward, wherein a nut mounting groove through which a nut is mounted is formed to pass through a surface of the coupling portion, and an incision groove connected to the nut mounting groove is formed in an end portion of the coupling portion; and
each of the first grip portion and the second grip portion includes a hollow coupling groove into which the coupling portion is rotatably inserted and which extends in a longitudinal direction, wherein a bolt fastening hole, which is connected to the coupling groove and into which a bolt fastened to the nut is inserted, is formed in a lower end of each of the first and second grip portions.
6. A hand gripper comprising:
a first arm including a first body and a first grip portion;
a second arm including a second body and a second grip portion, wherein an upper end portion of the second body is rotatably connected to an upper end portion of the first body; and
a pair of spring members symmetrically provided on front and rear surfaces of the first and second bodies, each of the spring members including a first compression spring, first spring supports and second spring supports by which the first compression spring interposed therebetween is compressibly supported;
a first spring member coupling shaft through which the first spring supports are connected to each other and which is supported by the first body; and
a second spring member coupling shaft through which the second spring supports are connected to each other and which is supported by the second body;
wherein a through-hole is formed to pass through a surface of at least one of the first body and the second body, and a plurality of elastic force adjusting grooves to which the first spring member coupling shaft or the second spring member coupling shaft is coupled are formed in an inner side surface of the through-hole.