发明授权
- 专利标题: Overload protector for mechanical press
- 专利标题(中): 机械压力机用过载保护器
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申请号: US09534015申请日: 2000-03-24
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公开(公告)号: US06457406B1公开(公告)日: 2002-10-01
- 发明人: Keitaro Yonezawa , Tsutomu Shirakawa
- 申请人: Keitaro Yonezawa , Tsutomu Shirakawa
- 优先权: JP11-082748 19990326
- 主分类号: F16P500
- IPC分类号: F16P500
摘要:
Two hydraulic chambers (3a),(3b) within a slide (2) communicate with an overload protecting valve (12) through relief passages (11a),(11b). Check valves (13a),(13b) and discharge valves (14a),(14b) are arranged in series with each other in the respective relief passages (11a),(11b). When either of the two hydraulic chambers (3a),(3b) has a pressure not less than a set overload pressure, the overload protecting valve (12) opens to relieve pressurized oil within the hydraulic chamber (3a) to an exterior area via a restricting passage (78) of one discharge valve (14a) and the overload protecting valve (12). This switches over the two discharge valves (14a),(14b) to a discharging condition substantially at the same time to communicate the hydraulic chambers (3a),(3b) with a discharge port (R).
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