Invention Grant
- Patent Title: Piston, method of making the piston and piston and cylinder unit comprising the piston
- Patent Title (中): 活塞，活塞活塞和活塞单元的制作方法
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Application No.: US776619Application Date: 1991-10-15
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Publication No.: US5174192APublication Date: 1992-12-29
- Inventor: Peter E. Brown , Brian W. Perrins
- Applicant: Peter E. Brown , Brian W. Perrins
- Applicant Address: GBX Wednesbury
- Assignee: Jebron Limited
- Current Assignee: Jebron Limited
- Current Assignee Address: GBX Wednesbury
- Priority: GBX9022467 19901017
- Main IPC: B21D51/00
- IPC: B21D51/00 ; E05F3/00 ; E05F3/10 ; F04B53/14 ; F16J1/00
Abstract:
A piston for a door closer comprises metal cups on opposite ends of a stem. A plastics ring is a snap-fit in one of the cups and protrudes from that cup to seal against the wall of a cylinder. A groove in the side wall of the cup for receiving a rib on the ring is formed by pressing a substantially flat blank before the blank is formed into the cup.
Public/Granted literature
- US4674249A Roofing and decking construction Public/Granted day:1987-06-23
Information query
