The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 2010
Filed:
Dec. 11, 2008
Steven M. Akkala, Neenah, WI (US);
Randy P. Remme, Fremont, WI (US);
Steven M. Akkala, Neenah, WI (US);
Randy P. Remme, Fremont, WI (US);
Neenah Foundry Company, Neenah, WI (US);
Abstract
A manhole cover assembly including a frame defining an opening and a cover sized to engage the opening. A lift pin is retained by the frame, defining a first axis, and includes a bearing portion, and a top end connected to the cover. The lift pin is free to slide axially along the first axis. A spiral cam is retained to the frame by a torque shaft including an upper and lower end, defining a second axis offset from the first axis. The spiral cam includes a cam surface in selective engagement with the bearing portion of the lift pin so that rotation of the torque shaft about the second axis causes rotation of the spiral cam about the second axis and displacement of the lift pin along the first axis.