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1. 发明专利

GB2318628B Pneumatic spring 未知
公开(公告)号：GB2318628B
公开(公告)日：1998-09-30
申请号：GB9725888
申请日：1996-05-30
申请人： AVM INC
发明人： CHAMBERLAIN JAMES B
IPC分类号： F16F9/02 , F16F9/32 , F16F9/34 , F16F9/36
摘要： A pneumatic counterbalance spring includes a hollow cylinder defining a first internal chamber divided into a compression compartment and an extension compartment by a piston movably mounted in the chamber. The compression compartment contains pressurized gas and a seal assembly mounted on the piston prevents the gas from escaping into the extension compartmint. A piston rod is slibably mounted in the open end of the cylinder and has its inner end connected to the piston. The piston rod includes a hollow portion defining a second internal chamber which is fluidly connected to the compression compartment by a flow passage. As a result, the compression compartment has an effective volume of A+B, where A represents the volume of the compression compartment and B represents the volume of the piston rod internal chamber. This design is advantageous in applications where a low spring rate is desired and where the length of the spring needs to be minimized. A gas permeable insert may be positioned in the flow passage to provide restricted rate flow of gas through the flow passage. Alternatively, a check valve may be provided for providing restricted rate flow of gas through the flow passage during the extension stroke and a tree, by-pass flow of gas through the flow passage during the compression stroke.

2. 发明专利

GB2306567A Variable-speed gas spring:door closer 未知
公开(公告)号：GB2306567A
公开(公告)日：1997-05-07
申请号：GB9622112
申请日：1996-10-23
申请人： AVM INC
发明人： JEFFRIES MARK STEVEN , CHAMBERLAIN JAMES B , EVANS ARCHIE L
IPC分类号： E05F1/08 , E05F1/10 , E05F3/02 , F16F9/02 , F16F9/46 , F16F9/516 , E05F3/00 , F16F9/00
摘要： In a variable-speed gas spring, usable as a door closer, a piston has one part rotatable, with piston rod rotation, relative to another part to vary the length of a liquid flow path through the piston, thus varying the speed of extension of the piston rod. One piston part has an inwardly-directed duct which overlaps groove 106 of an abutting part 76, relative part rotation varying the length of groove part 112 through which fluid has to flow. Alternatively, path length may be varied by relative rotation so that: one part having a curved outer surface exposes a varying length of a radial groove, of varying depth, in another part (Figures 11-16, not shown); or, a radial slot in one part overlaps, with relative rotation, different ones of inwardly-directed slots in a second part, the second-part slots having different widths and radial extent (Figures 17-26, not shown). The piston moves axially on the rod to allow fluid flow during spring compression. A seal on piston part 76 has a projection which engages a cylinder groove.

3. 发明专利

GB2306567B Door closing mechanism 未知
公开(公告)号：GB2306567B
公开(公告)日：2000-01-19
申请号：GB9622112
申请日：1996-10-23
申请人： AVM INC
发明人： JEFFRIES MARK STEVEN , CHAMBERLAIN JAMES B , EVANS ARCHIE L
IPC分类号： E05F1/08 , E05F1/10 , E05F3/02 , F16F9/02 , F16F9/46 , F16F9/516 , E05F3/00 , F16F9/00
摘要： An adjustable speed gas spring primarily adapted for use as a part of a door closing mechanism. The gas spring includes a piston assembly which is disposed within an elongated fluid chamber and which upon relative rotation of the shaft with respect to the tubular body, permits the user to adjust the shaft extension velocity. The gas spring is fully functional in any shaft orientation.

4. 发明专利

GB2318628A Pneumatic spring 未知
公开(公告)号：GB2318628A
公开(公告)日：1998-04-29
申请号：GB9725888
申请日：1996-05-30
申请人： AVM INC
发明人： CHAMBERLAIN JAMES B
IPC分类号： F16F9/02 , F16F9/32 , F16F9/34 , F16F9/36
摘要： A pneumatic counterbalance spring (10) includes a hollow cylinder (15) defining a first internal chamber (20) divided into a compression compartment (50) and an extension compartment (55) by a piston (25) movably mounted in the chamber. The compression compartment (50) contains pressurized gas and a seal assembly (60) which is mounted on the piston (25) prevents the gas from escaping into the extension compartment (55). A piston rod is slidably mounted in the open end of the piston. The piston rod (30) includes a hollow portion defining a second internal chamber (125) which is fluidly connected to the compression compartment (50) by a flow passage (140). A gas permeably insert (150) may be positioned in the flow passage to provide restricted rate flow of gas through the flow passage.

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