Ergonomic Hand Grip Strengthener

Abstract

An ergonomic hand grip strengthener includes a front operation handle for ergonomic placement of an index finger, a middle finger, a ring finger and a pinky finger of the holding hand of the user, a rear operation handle for abutting against a thumb and a palm of the holding hand of the user, and a strength adjustment assembly for adjusting a resistance applied to approaching movement between the front operation handle and the rear operation handle.

What is claimed is: 
     
         1 . An ergonomic hand grip strengthener for being gripped by a holding hand of a user, comprising:
 a front operation handle for placement of an index finger, a middle finger, a ring finger and a pinky finger of the holding hand of the user;   a rear operation handle for abutting against a thumb and a palm of the holding hand of the user; and   a strength adjustment assembly for adjusting a resistance applied to approaching movement between said front operation handle and said rear operation handle.   
     
     
         2 . The ergonomic hand grip strengthener according to  claim 1 , wherein said front operation handle comprises a first groove profile surface defining a first holding groove for holding the index finger, a second groove profile surface defining a second holding groove for holding the middle finger, a third groove profile surface defining a third holding groove for holding the ringer finger, and a fourth groove profile surface defining a fourth holding groove for holding the pinky finger, wherein each of said first holding groove, said second holding groove, said third holding groove and said fourth holding groove is extended along a circumferential direction and occupies a quarter to three quarters of a circumference of said front operation handle. 
     
     
         3 . The ergonomic hand grip strengthener according to  claim 2 , wherein said first groove profile surface comprises a first middle line, said second groove profile surface comprises a second middle line, said third groove profile surface comprises a third middle line, said fourth groove profile surface comprises a fourth middle line, wherein said first middle line has a first central contact position, said second middle line has a second central contact position, said third middle line has a third central contact position, said fourth middle line has a fourth central contact position, wherein said first central contact position is positioned backward compared with said second central contact position, wherein said fourth central position is positioned backward compared with said third central contact position. 
     
     
         4 . The ergonomic hand grip strengthener according to  claim 3 , wherein said first groove profile surface is configured to be symmetrical with respect to said first middle line, said second groove profile surface is configured to be symmetrical with respect to said second middle line, said third groove profile surface is configured to be symmetrical with respect to said third middle line, said fourth groove profile surface is configured to be symmetrical with respect to said fourth middle line. 
     
     
         5 . The ergonomic hand grip strengthener according to  claim 2 , wherein said first holding groove is positioned further back than said second holding groove, wherein said fourth holding groove is positioned further back than said third holding groove. 
     
     
         6 . The ergonomic hand grip strengthener according to  claim 1 , wherein said rear operation handle comprises an arm body and a protrusion part extended from a side of said arm body for conforming to a groove of the palm of the holding hand of the user. 
     
     
         7 . The ergonomic hand grip strengthener according to  claim 2 , wherein said rear operation handle comprises an arm body and a protrusion part extended from a side of said arm body for conforming to a groove of the palm of the holding hand of the user. 
     
     
         8 . The ergonomic hand grip strengthener according to  claim 4 , wherein said rear operation handle comprises an arm body and a protrusion part extended from a side of said arm body for conforming to a groove of the palm of the holding hand of the user. 
     
     
         9 . The ergonomic hand grip strengthener according to  claim 2 , wherein said front operation handle comprises a rear extension surface, wherein from top to bottom, said rear extension surface is gradually protruding frontward first, and then gradually receding backward. 
     
     
         10 . The ergonomic hand grip strengthener according to  claim 1 , wherein said front operation handle comprises a front abutting surface which comprises an upper surface section and a lower surface section which is integrally extended from said upper surface section, wherein along a direction from top to bottom, said upper surface section is gradually protruding frontward while said lower surface section is gradually receding backward, wherein the front abutting surface is an integral continual surface without holding grooves. 
     
     
         11 . The ergonomic hand grip strengthener according to  claim 1 , wherein said rear operation handle has a concave groove for placement of the thumb, wherein said concave groove is positioned circumferentially around said rear operation handle and occupying a quarter to three quarters of a circumference of said rear operation handle. 
     
     
         12 . The ergonomic hand grip strengthener according to  claim 2 , wherein said rear operation handle has a concave groove for placement of the thumb, wherein said concave groove is positioned circumferentially around said rear operation handle and occupying a quarter to three quarters of a circumference of said rear operation handle. 
     
     
         13 . The ergonomic hand grip strengthener according to  claim 4 , wherein said rear operation handle has a concave groove for placement of the thumb, wherein said concave groove is positioned circumferentially around said rear operation handle and occupying a quarter to three quarters of a circumference of said rear operation handle. 
     
     
         14 . The ergonomic hand grip strengthener according to  claim 6 , wherein said rear operation handle has a concave groove for placement of the thumb, wherein said concave groove is positioned circumferentially around said rear operation handle and occupying a quarter to three quarters of a circumference of said rear operation handle. 
     
     
         15 . The ergonomic hand grip strengthener according to  claim 1 , wherein said rear operation handle comprises a rear abutment surface which comprises a top abutting surface section, a thumb abutting surface section extended from said top abutting surface section to define a concave groove for placing the thumb, and a palm abutting surface section extended from said thumb abutting surface section for abutting against the palm of the holding hand of the user. 
     
     
         16 . The ergonomic hand grip strengthener according to  claim 15 , wherein said palm abutting surface section comprises a first abutting surface portion and a second abutting surface portion extended from said first abutting surface portion, wherein from top to bottom, said thumb abutting surface section is gradually protruding backward, said first abutting surface portion is gradually protruding backward while said second abutting surface portion is gradually receding frontward, wherein said first abutting surface portion and said second abutting surface portion are converged at a backward protruding peak position. 
     
     
         17 . The ergonomic hand grip strengthener according to  claim 1 , wherein said rear operation handle comprises a rear abutment surface which comprises a top abutting surface section, a thumb abutting surface section extended from said top abutting surface section to define a concave groove for placing the thumb, and a palm abutting surface section extended from said thumb abutting surface section for abutting against the palm of the holding hand of the user, wherein said palm abutting surface section comprises a first abutting surface portion and a second abutting surface portion extended from said first abutting surface portion, wherein from top to bottom, said thumb abutting surface section is gradually protruding backward, said first abutting surface portion is gradually protruding backward while said second abutting surface portion is gradually receding frontward, wherein said first abutting surface portion and said second abutting surface portion are converged at a backward protruding peak position. 
     
     
         18 . The ergonomic hand grip strengthener according to  claim 1 , wherein said front operation handle comprises a first groove profile surface defining a first holding groove for holding the index finger, a second groove profile surface defining a second holding groove for holding the middle finger, a third groove profile surface defining a third holding groove for holding the ringer finger, and a fourth groove profile surface defining a fourth holding groove for holding the pinky finger, wherein said first holding groove, said second holding groove, said third holding groove and said fourth holding groove are differed in widths for conforming to the index finger, the middle finger, the ring finger and the pinky finger. 
     
     
         19 . The ergonomic hand grip strengthener according to  claim 18 , wherein a fourth width of said fourth holding groove is smaller than a third width of said third holding groove. 
     
     
         20 . The ergonomic hand grip strengthener according to  claim 11 , wherein said rear operation handle further has a lower concave groove.