Air damper
First Claim
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1. An air damper comprising:
- a cylinder;
a rod slidably mounted in one end of said cylinder and projecting outwardly thereof;
a piston carried on said rod for reciprocation within said cylinder in sealing relation with the inner wall surface thereof and subdividing said cylinder into a first chamber outwardly of said piston and a second chamber inwardly thereof, said piston having an axially extending through bore dimensioned to accommodate movement of said rod therethrough;
air ports in said cylinder opening respectively into said first and second chambers;
means for retaining said piston on said rod permitting relative axial movement therebetween;
spring means for biasing said rod outwardly of said cylinder;
and a shoulder on said rod defining a section of reduced diameter extending to the end of said rod adjacent said piston reatining means, the radial dimension of said reduced diameter section being less than the diameter of the piston bore to define therewith an axially extending passageway normally establishing communication between said first and second chambers and the length of said section of reduced diameter being greater than the axial extent of said piston bore;
said rod being slidable inwardly of said cylinder so as to close the air port in said first chamber by positioning of the portion of said rod outwardly of said shoulder over said air port, movement of said rod inwardly of said cylinder also serving to effect engagement of said piston by said shoulder to prevent communication between said first and second chambers by closure of said passageway therebetween.
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Abstract
An air damper comprises a cylinder having air ports at its upper and lower portions, a piston rod, a piston movably mounted on one end of the piston rod, a return spring, an air passage provided between upper and lower chambers within the cylinder which passage is opened and closed by the movement of the piston, and an air regulating valve press-fit into the lower air port portion of the cylinder.
49 Citations
11 Claims
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1. An air damper comprising:
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a cylinder; a rod slidably mounted in one end of said cylinder and projecting outwardly thereof; a piston carried on said rod for reciprocation within said cylinder in sealing relation with the inner wall surface thereof and subdividing said cylinder into a first chamber outwardly of said piston and a second chamber inwardly thereof, said piston having an axially extending through bore dimensioned to accommodate movement of said rod therethrough; air ports in said cylinder opening respectively into said first and second chambers; means for retaining said piston on said rod permitting relative axial movement therebetween; spring means for biasing said rod outwardly of said cylinder; and a shoulder on said rod defining a section of reduced diameter extending to the end of said rod adjacent said piston reatining means, the radial dimension of said reduced diameter section being less than the diameter of the piston bore to define therewith an axially extending passageway normally establishing communication between said first and second chambers and the length of said section of reduced diameter being greater than the axial extent of said piston bore; said rod being slidable inwardly of said cylinder so as to close the air port in said first chamber by positioning of the portion of said rod outwardly of said shoulder over said air port, movement of said rod inwardly of said cylinder also serving to effect engagement of said piston by said shoulder to prevent communication between said first and second chambers by closure of said passageway therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification