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US 4,545,290 AGranted
Pressure cylinder
AssigneeTol-O-Matic, Inc.
InventorWalter G. Lieberman
Life of this patent
Estimating the term…
Abstract
A fluid pressure cylinder of the rodless type having a reciprocally movable piston, an elongated slot within the cylinder and an improved sealing element for successively sealing the elongated slot during movement of the piston. The improved sealing element is constructed of a generally flexible material and includes a sealing portion for creating a seal against the inner side wall of the cylinder adjacent to the elongated slot and a portion which is adapted for at least partial insertion wthin the slot so as to retain the seal member within the slot during an absence of pressure within the cylinder.
Claims45
A pressure cylinder comprising:
- an elongated tubular member having a side wall, a pair of pressure chambers and an elongated slot extending through said side wall and defined by opposed edge portions of said side wall;
- a piston reciprocally movable within said tubular member;
- and
- means for successively sealing said slot during movement of said piston including an elongated seal member having a first portion for sealing engagement with a portion of the inner surface of said tubular member on each side of said elongated slot and a second portion for insertion into said elongated slot,
- said second portion including a retaining portion with a width greater than the width between corresponding side wall portions of said elongated slot so that upon insertion of said second portion into said elongated slot, said second portion will be retained therein as a result of engagement between the retaining portion of said second piston and said side wall portions of said elongated slot.
2 more elements
A pressure cylinder comprising:
- an elongated cylinder having a pair of pressure chambers and an elongated slot of predetermined width;
- a piston reciprocally movable within said cylinder;
- and
- means for successively sealing said slot during movement of said piston including an elongated seal member having a first portion for sealing engagement with a portion of the inner surface of said cylinder on each side of said elongated slot and a second portion for insertion into at least a portion of said elongated slot, said second portion including a neck portion connected with said first portion and a retaining portion for insertion into said slot comprising a retaining lip extending outwardly from said neck portion on at least one side thereof and said elongated slot including an elongated retaining groove extending along at least one of the side edges of said slot for engagement with said retaining lip.
1 more element
A pressure cylinder comprising:
- an elongated cylinder having a pair of pressure chambers and an elongated slot of predetermined width;
- a piston reciprocally movable within said cylinder;
- and
- means for successively sealing said slot during movement of said piston including an elongated seal member having a first portion for sealing engagement with a portion of the inner surface of said cylinder on each side of said elongated slot and a second portion for insertion into at least a portion of said elongated slot, said second portion including a neck portion connected with said first portion and a retaining portion for insertion into said slot comprising a retaining lip extending outwardly from each side of said neck portion and said elongated slot including an elongated retaining groove extending along each of its side edges for engagement with said retaining lips.
1 more element
A pressure cylinder comprising:
- an elongated cylinder having a pair of pressure chambers and an elongated slot of predetermined width;
- a piston reciprocally movable within said cylinder;
- and
- means for successively sealing said slot during movement of said piston including an elongated seal member having a first portion for sealing engagement with a portion of the inner surface of said cylinder on each side of said elongated slot and a second portion for insertion into at least a portion of said elongated slot;
- force transfer means connected with said piston and having a portion extending through said elongated slot, said force transfer means including means for causing insertion of said second portion into and withdrawal of said second portion from said elongated slot in response to movement of said piston wherein said means for causing insertion of said second portion into said elongated slot includes a pair of spaced apart insertion rollers having a surface for engaging the side of said first portion facing the center of said cylinder and said means for causing withdrawal of said second portion from said elongated slot includes a withdrawal roller disposed between said insertion rollers and having a surface for engaging the side of said first portion facing away from the center of said cylinder, said first portion including a pair of sealing lips for sealing engagement with said portion of the inner surface of said cylinder on each side of said elongated slot and said withdrawal roller including a pair of spaced surfaces for engaging said sealing lips.
2 more elements
An elongated seal member for sealing an elongated slot in a pressure cylinder of the type having an elongated tubular member with a pair of pressure chambers and a piston reciprocally movable within said tubular member, said seal member comprising:
- a first portion comprising a pair of sealing lips for sealing engagement with a portion of the inner surface of said cylinder on each side of said elongated slot;
- and
- a second portion for insertion into at least a portion of said elongated slot, said second portion including a retaining portion with a width greater than the width between corresponding side wall portions of said elongated slot so that upon insertion of said second portion into said elongated slot, said second portion will be retained therein as a result of engagement between the retaining portion of said second portion and said side wall portions of said elongated slot.
A rodless pressure cylinder comprising:
- an elongated cylinder having a pair of pressure fluid chambers at each end and an elongated slot of predetermined width extending the entire length of the cylinder, said slot extending through the side wall of said cylinder and being defined by opposed edge portions of said side wall;
- a piston disposed between and defining said pressure fluid chambers and being reciprocally movable within said cylinder in response to the introduction of fluid pressure into and exhaustion of fluid pressure from said pressure fluid chambers;
- a force transfer bracket connected with said piston for movement therewith and having a portion extending through said elongated slot;
- and
- means for successively sealing said slot during movement of said piston including an elongated seal member connected at each end to said cylinder and having a first portion comprising a pair of sealing lips for sealing engagement with a portion of the inner surface of said cylinder on either side of said elongated slot and a second portion for insertion into said elongated slot for retaining the same in such position in the absence of fluid pressure within the pressure chambers, said second portion having a retaining portion with a width greater than the width between corresponding side wall portions of said elongated slot so that upon insertion of said second portion into said elongated slot, said second portion will be retained therein as a result of engagement between the retaining portion of said second portion and said side wall portions of said elongated slot.
2 more elements
Dependencies are inferred from the claim text.