Hydraulic shock absorber

Claim 2

A hydraulic shock absorber including: a cylinder assembly; a sealing head fixed to one end of the cylinder assembly; a piston recIprocatingly inserted into the cylinder assembly; a foot-valve assembly housed in the cylinder assembly near the other end thereof; a piston rod secured to the piston and passing through the sealing head; a first chamber defined by the cylinder assembly, piston and sealing head; a second chamber defined by the cylinder assembly, piston and foot-valve assembly; a third chamber defined by the cylinder assembly, foot-valve assembly and the other end of the cylinder assembly; damping oil filled in the first, second and third chambers; a first by-pass extending through the piston from one end of the piston rod adjacent to the second chamber to an intermediate portion of the piston rod so as to effect communication between the first and second chambers; a first jet detachably screwed into said one end of the piston rod so as to communicate with one end of the first by-pass adjacent to the second chamber; the foot-valve assembly being provided with a through hole disposed axial with the first jet and communicating at the respective ends thereof with the second and third chambers, the through hole having a larger diameter than the outer diameter of the first jet; the cylinder assembly being provided in the other end with an opening which has a larger diameter than the diameter of the through hole and is substantially coaxial with the first jet and through hole; a plug detachably inserted into the through hole in a fluid tight state; a second by-pass provided in the plug so as to effect communication between the second and third chambers; and a second jet provided in the plug so as to connect the second by-pass to the second chamber, whereby, after the plug is removed from the cylinder assembly through the opening with the second jet still mounted therein, the first jet may be drawn out of the cylinder assembly through the through hole and opening.

Claim 3

A hydraulic shock absorber according to claim 1 further comprising a support member integrally formed with the other end of the cylinder assembly so as to support the shock absorber.

Claim 4

A hydraulic shock absorber according to claim 1 further comprising a support member integrally formed with the plug and attached to the other end of the cylinder assembly so as to support the shock absorber.

Claim 5

A hydraulic shock absorber according to claim 1 wherein the plug is screwed into the other end of the cylinder assembly.

Claim 6

A hydraulic shock absorber including: a cylinder assembly; a sealing head fixed to one end of the cylinder assembly; a piston reciprocatingly inserted into the cylinder assembly; a foot-valve assembly housed in the cylinder assembly near the other end thereof; a piston rod secured to the piston and passing through the sealing head; a first chamber defined by the cylinder assembly, piston and sealing head; a second chamber defined by the cylinder assembly, piston and foot-valve assembly; a third chamber defined by the cylinder assembly, foot-valve assembly and the other end of the cylinder assembly; damping oil filled in the first, second and third chambers; a first by-pass extending through the piston from one end of the piston rod adjacent to the second chamber to an intermediate portion of the piston rod so as to effect communication between the first and second chambers; a first jet detachably mounted on said one end of the piston rod so as to communicate with one end of the first by-pass adjacent to the second chamber; the foot-valve assembly being provided with a through hole disposed axial with the first jet and communicating at the respective ends thereof with the second and third chambers, said through hole having a larger diameter than the outer diameter of the first jet; a second by-pass for effecting communication between the second and third chambers; mounting means provided in the foot-valve assembly for inserting the second by-pass in the through hole; the cylinder assembly being provided in the other end with an opening which has a larger diameter than the outer diameter of the first jet and the mounting means and is substantially coaxial with the first jet and through hole; and a second jet mounted in said mounting means so as to communicate with one end of the second by-pass, whereby the mounting means is drawn out of the cylinder assembly together with the second jet through the opening, and thereafter the first jet is drawn out of the cylinder assembly through the through hole and opening.

Claim 7

A hydraulic shock absorber including: a cylinder assembly; a sealing head fixed to one end of the cylinder assembly; a piston reciprocatingly inserted into the cylinder assembly; a foot-valve assembly housed in the cylinder assembly near the other end thereof; a piston rod secured to the piston and passing through the sealing head; a first chamber defined by the cylinder assembly, piston and sealing head; a second chamber defined by the cylinder assembly, piston and foot-valve assembly; a third chamber defined by the cylinder assembly, foot-valve assembly and the other end of the cylinder assembly; damping oil filled in the first, second and third chambers; a first by-pass extending through the piston from one end of the piston rod adjacent to the second chamber to an intermediate portion of the piston rod so as to effect communication between the first and second chambers; a first jet detachably mounted on said one end of the piston rod so as to communicate with one end of the first by-pass adjacent to the second chamber; the foot-valve assembly being provided with a through hole disposed axial with the first jet and communicating at the respective ends thereof with the second and third chambers, said through hole having a larger diameter than the outer diameter of the first jet; a second by-pass for effecting communication between the second and third chambers; mounting means provided in the foot-valve assembly for inserting the second by-pass in the through hole; the cylinder assembly being provided in the other end with an opening which has a larger diameter than the outer diameter of the first jet and the mounting means and is substantially coaxial with the first jet and through hole; and a second jet mounted in said mounting means so as to communicate with one end of the second by-pass, whereby the mounting means is drawn out of the cylinder assembly together with the second jet through the opening, and thereafter the first jet is drawn out of the cylinder assembly through the through hole and opening.

Claim 8

A hydraulic shock absorber according to claim 5 wherein the first jet is detachably screwed into said one end of the piston rod.

Claim 9

A hydraulic shock absorber according to claim 6 wherein the mounting means comprises a plug detachably inserted into the opening in a fluid tight state.