Shock Absorber

Abstract

A shock absorber utilizes an internal passage design and cooperates with at least one flow-restricting member and elastic member to change the flow speed and displacement during the extension and retraction of the shock absorber, so as to make the extending and retracting speeds of the shock absorber different for buffering the shake wave to the house, thus reducing the force shaking the house in the earthquake.

1 . A shock absorber comprising:
 a driving member including a driven rod and a piston, the driven rod being formed at one end thereof with an assembling portion, the piston being formed at one end thereof with an assembling portion to be assembled with the assembling portion of the driven rod, the piston being axially formed with a flow-restricting passage;   a first flow-restricting member including a through hole and a flow-restricting portion, the assembling portion of the piston being inserted through the through hole of the first flow-restricting member, and the flow-restricting member being positioned on the piston by the driven rod in such a manner that the flow-restricting portion of the first flow-restricting member cooperates with the flow-restricting passage of the piston;   a holder including an inner tube, a first leak-proof member, a second leak-proof member, a positioning member and an outer tube, the inner tube being used for insertion of the piston of the driving member, the first leak-proof member being axially defined with a through hole for insertion of the driven rod of the driving member, one end of the first leak-proof member being engaged with one end of the inner tube, an outer surface of the first leak-proof member abutting against one end inner surface of the outer tube, one end of the second leak-proof member being engaged with the other end of the inner tube, an outer surface of the second leak-proof member abutting against the other end inner surface of the outer tube, the second leak-proof member including at least one flow-restricting passage, one end of the flow-restricting passage penetrating one end of the second leak-proof member, and the other end of the flow-restricting passage penetrating a side of the second leak-proof member, one end of the positioning member being assembled with one end of the second leak-proof member, the inner tube, the first leak-proof member and the second leak-proof member defining a first inner space, the first leak-proof member, the inner tube and the second leak-proof member being disposed in the outer tube and defining a second inner space, the flow-restricting passage of the second leak-proof member communicating with the first inner space and the second inner space, respectively; and   a second flow-restricting member including a through hole and a flow-restricting portion, the through hole of the second flow-restricting member being provided for insertion of the positioning member and assembled with the second leak-proof member in such a manner that the flow-restricting portion of the second flow-restricting member cooperates with the flow-restricting passage of the second leak-proof member.   
   
   
       2 . The shock absorber as claimed in  claim 1  further comprising an elastic member between the positioning member and the second leak-proof member, the elastic member being mounted on the positioning member, one end of the elastic member elastically abutting against the positioning member, and the other end of the elastic member elastically abutting against the second leak-proof member. 
   
   
       3 . The shock absorber as claimed in  claim 1 , wherein the assembling portion of the driven rod of the driving member is in the form of an inner threaded hole, the assembling portion of the piston of the driving member is in the form of an outer threaded portion, around an outer surface of the piston are defined at least two spaced-apart grooves for accommodation of stopping members and wear-resistance members, respectively;
 an inner surface of the inner tube of the holder is in contact with the stopping members and wear-resistance members of the piston of the driving member, the through hole of the first leak-proof member is provided with a bush, a stopping member and a guiding member, the first leak-proof member of the holder is brought into contact with an outer surface of the driven rod by the bush, stopping member and guiding member, around the outer surface of the first leak-proof member is defined at least one groove for accommodation of at least one stopping member, around the outer surface of the second leak-proof member is defined at least one groove for accommodation of at least one stopping member, one end of the second leak-proof member is defined with an assembling portion for assembling with one end of the positioning member, the assembling portion of the second leak-proof member is engaged with the inner tube; and   the positioning member is inserted through the second flow-restricting member and then assembled with the assembling portion of the second leak-proof member, so that the second flow-restricting member is positioned on the second leak-proof member by the positioning member.   
   
   
       4 . A shock absorber comprising:
 a driving member including a driven rod and a piston, the driven rod being assembled with the piston, the piston including a flow-restricting passage;   a first flow-restricting member being mounted on the piston and including a flow-restricting portion, the flow-restricting member being positioned on the piston by the driven rod in such a manner that the flow-restricting portion of the first flow-restricting member cooperates with the flow-restricting passage;   a holder including an inner tube, a first leak-proof member, a second leak-proof member, a positioning member and an outer tube, the inner tube being used for insertion of the piston of the driving member, the first leak-proof member being axially defined with a through hole for insertion of the driven rod of the driving member, one end of the first leak-proof member being engaged with one end of the inner tube, an outer surface of the first leak-proof member abutting against one end inner surface of the outer tube, one end of the second leak-proof member being engaged with the other end of the inner tube, an outer surface of the second leak-proof member abutting against the other end inner surface of the outer tube, the second leak-proof member including at least one flow-restricting passage, one end of the flow-restricting passage penetrating one end of the second leak-proof member, and the other end of the flow-restricting passage penetrating a side of the second leak-proof member, one end of the positioning member being assembled with one end of the second leak-proof member, the inner tube, the first leak-proof member and the second leak-proof member defining a first inner space, the first leak-proof member, the inner tube and the second leak-proof member being disposed in the outer tube and defining a second inner space, the flow-restricting passage of the second leak-proof member communicating with the first inner space and the second inner space, respectively; and   a second flow-restricting member being provided for insertion of the positioning member and assembled with the second leak-proof member, the second flow-restricting member including a flow-restricting portion, between the positioning member and the second leak-proof member is disposed an elastic member mounted on the positioning member, one end of the elastic member elastically abutting against the positioning member, and the other end of the elastic member elastically abutting against the second leak-proof member, the second flow-restricting member cooperates with the flow-restricting passage of the second leak-proof member.   
   
   
       5 . The shock absorber as claimed in  claim 4 , wherein the driven rod is formed at one end thereof with an assembling portion, the piston is formed at one end thereof with an assembling portion to be assembled with the assembling portion of the driven rod, the piston is axially formed with the flow-restricting passage. 
   
   
       6 . The shock absorber as claimed in  claim 4 , wherein:
 the driven rod of the driving member is in the form of an inner threaded hole, the piston of the driving member is in the form of an outer threaded portion, around an outer surface of the piston are defined at least two spaced-apart grooves for accommodation of stopping members and wear-resistance members, respectively;   an inner surface of the inner tube of the holder is in contact with the stopping members and wear-resistance members of the piston of the driving member, the through hole of the first leak-proof member is provided with a bush, a stopping member and a guiding member, the first leak-proof member of the holder is brought into contact with an outer surface of the driven rod by the bush, stopping member and guiding member, around the outer surface of the first leak-proof member is defined at least one groove for accommodation of at least one stopping member, around the outer surface of the second leak-proof member is defined at least one groove for accommodation of at least one stopping member, one end of the second leak-proof member is defined with an assembling portion for assembling with one end of the positioning member, the assembling portion of the second leak-proof member is engaged with the inner tube; and   the positioning member is inserted through the second flow-restricting member and then assembled with the assembling portion of the second leak-proof member, so that the second flow-restricting member is positioned on the second leak-proof member by the positioning member.   
   
   
       7 . A shock absorber comprising a driving member, a first flow-restricting member, a second flow-restricting member and an elastic member; wherein:
 the driving member includes a connecting head, a driven rod and a piston, the connecting head is formed with a radial restricting hole at one end thereof, and the other end of the connecting head is axially defined with an assembling portion in the form of an inner threaded hole, the driven rod is formed at one end thereof with a first assembling portion which is in the form of an outer threaded portion for screwing with the assembling portion of the connecting head, and formed at the other end thereof with a second assembling portion which is in the form of an inner threaded hole to be matched with the piston, the piston is formed at one end thereof with an assembling portion in the form of an outer threaded portion to be screwed with the second assembling portion of the driven rod, around an outer surface of the piston are defined three spaced-apart grooves for accommodation of two stopping members and a wear-resistance member, respectively, the stopping members and the wear-resistance member are all O rings, the piston is axially formed with an eccentric flow-restricting passage;   the first flow-restricting member is a flat piece being axially defined with a central through hole for insertion of the assembling portion of the piston, and at an outer edge of the first flow-restricting member is formed a flow-restricting portion, When the assembling portion of the piston is assembled with the second assembling portion of the driven rod, the flow-restricting member is pressed onto the piston by the driven rod in such a manner that the flow-restricting portion of the first flow-restricting member cooperates with the flow-restricting passage;   the holder includes an inner tube, a first leak-proof member, a second leak-proof member, a positioning member and an outer tube, the inner tube is used for axial insertion of the piston of the driving member, such that the piston is in contact with an inner surface of the holder via the stopping members and the wear-resistance, the first leak-proof member is axially defined with a through hole in which are disposed a bush, a stopping member and a guiding member, respectively, which are all O rings, the through hole of the first leak-proof member is provided for axial insertion of the driven rod of the driving member in such a manner that the first leak-proof member is brought into contact with the outer surface of the driven rod by the bush, stopping member and guiding member, around an outer surface of the first leak-proof member are defined two spaced-apart grooves for accommodation of two stopping members, respectively, which are O rings, one end of the first leak-proof member is engaged with one end of the inner tube, and the outer surface of the first leak-proof member abuts against one end inner surface of the outer tube, the second leak-proof member is defined in an outer surface thereof with two spaced-apart grooves for accommodation of two stopping members which are all O rings, one end of the second leak-proof member is defined with an assembling portion which is cylinder-shaped, around the outer surface of the second leak-proof member is formed a groove for accommodation of a stopping member, the second leak-proof member is further provided with two flow-restricting passages that are not connected to each other, one end of each of the flow-restricting passages penetrates one end of the second leak-proof member, and the other end of each of the flow-restricting passages penetrates a side of the second leak-proof member, the other end of the second leak-proof member is axially defined with a connecting head which is formed with a radial restricting hole, the positioning member has one end to be axially assembled with the assembling portion of the second leak-proof member, the assembling portion of the second leak-proof member is engaged with the other end of the inner tube, and the outer surface of the second leak-proof member abuts against the other end inner surface of the outer tube, both ends of the inner tube are engaged with the first leak-proof member and the second leak-proof member to define a first inner pace, subsequently, the first leak-proof member, the inner tube and the second leak-proof member are placed into the outer tube, the outer surface of the first leak-proof member is in contact with the one end inner surface of the outer tube via the stopping members, and the outer surface of the second leak-proof member is in contact with the other end inner surface of the outer tube via the stopping members in such a manner that a second inner space is defined between the inner tube and the outer tube, one end of each of the flow-restricting passages of the second leak-proof member communicates with first inner space, and the other end of each of the flow-restricting passages of the second leak-proof member communicates with the second inner space;   the second flow-restricting member is a flat piece being axially defined with a central through hole for insertion of the positioning member, and at an outer surface of the second flow-restricting member is formed with a flow-restricting portion, when the positioning member is inserted through the through hole of the second flow-restricting member and then assembled with the assembling portion of the second leak-proof member, the second flow-restricting member is pressed onto the second leak-proof member by the positioning member in such a manner that the flow-restricting portion of the second flow-restricting member cooperates with the flow-restricting passage of the second leak-proof member; and   the elastic member is a spring mounted on the positioning member, one end of the elastic member elastically abuts against the positioning member, and the other end of the elastic member elastically abuts against the second leak-proof member;   
   
   
       8 . The shock absorber as claimed in  claim 7 , wherein the piston is provided with an elastic member at each of two ends thereof in the first inner space, the elastic members of the piston are provided for retaining and positioning the shock absorber.