Linear actuator having an adjustable piston rod

A linear actuator comprising:

• an elongated member having the first and second portion wherein said first portion is connectable to a linkage assembly of a clamp, and said second portion is connectable to a piston wherein said elongated member is adjustable along a longitudinal axis of said elongated member;
• a cam movably connected to said second portion of said elongated member for movement between a locked position, wherein said cam cooperatively engages said first portion of said elongated member to releasably lock said elongated member into a predetermined position along said longitudinal axis, and an unlocked position, wherein said cam disengages said first portion of said elongated member to allow said elongated member to adjust along said longitudinal axis;
• said first and second portions of said elongated member are telescopically adjustable along said longitudinal axis;
• and
• said second portion of said elongated member having a cam housing in a shaft wherein said cam housing is connected to said shaft;
• a pivot pin connected to said cam housing or pivotally receiving said cam;
• and
• a spring having its ends connected to said cam housing in said cam to bias said cam towards said locked position.

A linear actuator comprising:

• an elongated member having a first and second portion wherein said first portion is connected to a linkage assembly of a clamp, and said second portion is connectable to a piston wherein said elongated member is adjustable along a longitudinal axis of said elongated member,
• a cam movably connected to said second portion of said elongated member for movement between a locked position, wherein said cam cooperatively engages said first portion of said elongated member to releasably lock said elongated member into a predetermined position along said longitudinal axis, and an unlocked position, wherein said cam disengages said first portion of said elongated member to allow said elongated member to adjust said longitudinal axis;
• and
• said cam having an aperture extending there through for receiving said first portion of said elongated member, and said aperture formed by first arcuate portion corresponding to said locked position, and a second arcuate portion corresponding to said unlocked position, wherein said second arcuate portion is larger than said first arcuate portion.

A linear actuator comprising:

• an elongated telescopic member having a first portion connectable to a power clamp, and a second portion connectable to a piston, and said telescopic member telescopically adjustable along a longitudinal axis of said telescopic member;
• a cam pivotally connected to said second portion of said telescopic member for movement between a locked position, wherein said cam cooperatively engages said first portion of said telescopic member to releasably lock said telescopic member in a predetermined position, and an unlocked position, wherein said cam disengages said first portion of said telescopic member to allow said telescopic member to telescopically adjust along said longitudinal axis;
• a spring having one of its ends connected to said second portion of said telescopic member and the other of its ends connected to said cam to bias said cam toward said locked position;
• and
• said cam having an aperture extending therethrough for receiving said first portion of said telescopic member, and said aperture having a first arcuate portion for receiving said first portion of said first telescopic member and said locked position, and second arcuate position for receiving said first portion of said telescopic member in said unlocked position, wherein said first arcuate portion is smaller than said second arcuate portion.

A linear actuator comprising:

• an elongated telescopic member having a first portion connectable to a power clamp, and a second portion connectable to a piston, and said telescopic member telescopically adjustable along a longitudinal axis of said telescopic member;
• a cam pivotally connected to said second portion of said telescopic member for movement between a locked position, wherein said cam cooperatively engages said first portion of said telescopic member to releasably lock said telescopic member in a predetermined position, and an unlocked position, wherein said cam disengages said first portion of said telescopic member to allow said telescopic member to telescopically adjust along said longitudinal axis;
• a spring having one of its ends connected to said second portion of said telescopic member and the other of its ends connected to said cam to bias said cam towards said locked position;
• and
• said second portion of said telescopic member having a cam housing and a shaft wherein said cam housing has a threaded aperture extending therethrough for threadingly receiving said shaft;
• and
• said cam housing having a sidewall with an aperture extending therethrough at an angle substantially perpendicular to said longitudinal axis to provide access to said cam for movement of said cam towards said unlocked position.