发明授权
US06457406B1 Overload protector for mechanical press 失效
机械压力机用过载保护器

  • 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
  • 申请号: US09534015
    申请日: 2000-03-24
  • 公开(公告)号: US06457406B1
    公开(公告)日: 2002-10-01
  • 发明人: Keitaro YonezawaTsutomu Shirakawa
  • 申请人: Keitaro YonezawaTsutomu Shirakawa
  • 优先权: JP11-082748 19990326
  • 主分类号: F16P500
  • IPC分类号: F16P500
Overload protector for mechanical press
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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