Abstract An ejection piston for use in cylindrical containers or packages (10) of the type containing viscous or plastic masses, such as sealing compounde and adhesives. The piston comprises a piston part (13) forming a skirt (15) as well as an arched piston top (14), and a separate piston actuating member (17) arched in a direction opposite to the piston top. An ejection prassure is applied to the actuating member (17) and transmitted to the piston top (14) whereby the affective diameter of the piston top is slightly increased. An annular sealing sleeve for receiving the piston skirt (15) and the adjacent free end of the cylindrical container (10) during storape may be formed integrally with the piston actuating member (17).
A piston for ejecting a viscous or plastic mass (11) from a cylindrical container or package (10), said piston comprising a peripheral skirt (15) closed at one end by an end wall or piston top (14) arched in a direction away from said skirt, characterized in further comprising a separate piston actuating member (17) arranged within said skirt (15) so as to engage with the piston top (14) at the periphery thereof, said actuating member being arched in a directed opposite to the arching of the piston top.
Claim 2
Dependent Claim
88 words
A piston for ejecting a viscous or plastic mass (11) from a cylindrical container or package (10), said piston comprising a peripheral skirt (15) closed at one end by an end wall or piston top (14) arched in a direction away from said skirt, characterized in further comprising a separate piston actuating member (17) arranged within said skirt (15) so as to engage with the piston top (14) at the periphery thereof, said actuating member being arched in a directed opposite to the arching of the piston top.
Claim 3
Dependent Claim
39 words
A piston according to claim 1, characterized in that the piston top (14) and/or the actuating member is/are provided with guide means (15, 21) for mutually guiding said piston top and said actuating member during relative axial movement thereof.
Claim 4
Dependent Claim
73 words
A piston according to claim 1 or 2 comprising an annular sealing sleeve (18) having a substantially U-shaped cross-section and being adapted to tightly receive said piston skirt and an adjacent end of the cylindrical container wall, characterized in that the sealing sleeve (18) is formed integrally with the actuating member (17), and in that a weakening zone or line (25) is formed in said sleeve at the bottom of said U-shaped cross-section.
Claim 5
Dependent Claim
40 words
A piston according to claim 3, characterized in that one or more axially extending venting grooves (22) is/are formed in the surface part (21) of the sealing sleeve adapted to engage with the inner surface of the piston skirt (15).
Claim 6
Dependent Claim
36 words
A piston according to any of the claims 1 - 4, characterized in that the separate actuating member is made from a material different from that from which the remaining part of the piston is made.
Claim 7
Dependent Claim
26 words
A piston according to any of the claims 1 - 5, characterized in that the actuating member (17) has an outer, substantially plane central surface part.