초록 ▼

In the illustrative embodiments described, a cylinder-piston device such as a gas spring includes a novel piston rod-piston unit assembly which embodies a snap-on type construction for facilitating the connection and disconnection of the piston unit to and from the piston rod. Resilient tongue membe

In the illustrative embodiments described, a cylinder-piston device such as a gas spring includes a novel piston rod-piston unit assembly which embodies a snap-on type construction for facilitating the connection and disconnection of the piston unit to and from the piston rod. Resilient tongue members carried by the piston unit are formed with detent-like abutment members at their free ends, which abutment members snap behind an engagement shoulder, formed for example by a disc or groove, on the piston rod to hold the piston unit on the rod. The free ends of the tongue members are also formed with bevelled surfaces which coact with the piston rod to cam the tongue members radially outward as the piston unit is urged onto the piston rod, so that the abutment members are first displaced away from and then snap behind the abutment shoulder. Once the piston rod-piston unit assembly is in place within the cylinder, the inner surface of the cylinder prevents the tongue members from deflecting outward enough for the abutment members to be free of the abutment shoulder. The piston unit may be slidably on the piston rod between two axial terminal positions at which the piston unit and rod together define two different damping flow cross sections.

대표청구항 ▼

In a cylinder-piston device including a cylinder member having a longitudinal axis and two ends, a cavity being defined within said cylinder member, a fluid within said cavity, a piston rod member axially movable with respect to said cylinder member and extending in sealing relation through at least

In a cylinder-piston device including a cylinder member having a longitudinal axis and two ends, a cavity being defined within said cylinder member, a fluid within said cavity, a piston rod member axially movable with respect to said cylinder member and extending in sealing relation through at least one end thereof, and a piston unit mounted on said piston rod member within said cavity for axial movement therewith relative to the cylinder member, the improvement comprising: first and second cooperative engagement means carried by said piston rod member and by said piston unit, respectively, for releasably mounting said piston unit on said piston rod member, at least one of said first and second engagement means being radially displaceable relative to the longitudinal axis of said cylinder, when said piston unit is located outside said cylinder, between a first radial position, at which said one means is engaged with said other engagement means to connect said piston unit to said piston rod member, and a second radial position, at which said one means is disengaged from said other engagement means to permit the mounting of said piston unit to said piston rod member.