Invention Grant
- Patent Title: Hybrid spring for a hydraulic cylinder
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Application No.: US16117573Application Date: 2018-08-30
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Publication No.: US10760598B2Publication Date: 2020-09-01
- Inventor: Frantz Stanford
- Applicant: Enerpac Tool Group Corp.
- Applicant Address: US WI Menomonee Falls
- Assignee: Enerpac Tool Group Corp.
- Current Assignee: Enerpac Tool Group Corp.
- Current Assignee Address: US WI Menomonee Falls
- Agency: Michael Best & Friedrich LLP
- Main IPC: F15B15/14
- IPC: F15B15/14 ; F16F9/32 ; F16F9/36

Abstract:
A piston cylinder assembly includes a housing defining a housing cavity, a piston movably supported by the housing, and a spring return assembly connected between the housing and the piston. A fluid supplied to the housing cavity is operable to cause the piston to extend out of the housing and the spring return assembly is operable to cause the piston to retract into the housing. The spring return assembly includes a first spring member connected at one end to the housing and having an opposite end. The first spring member is operable to apply a first spring force. A second spring member is connected at one end to the piston and has an opposite end. The second spring member is operable to apply a second spring force. The opposite end of each of the first second spring members cooperate to apply the first and second spring forces in series.
Public/Granted literature
- US20190072117A1 HYBRID SPRING FOR A HYDRAULIC CYLINDER Public/Granted day:2019-03-07
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