Invention Grant
- Patent Title: Auxiliary spring multiple revolution clutch device
- Patent Title (中): 辅助弹簧多转离合器
-
Application No.: US12730543Application Date: 2010-03-24
-
Publication No.: US08162026B1Publication Date: 2012-04-24
- Inventor: Karl Harvey Lundahl
- Applicant: Karl Harvey Lundahl
- Applicant Address: US MN Coon Rapids
- Assignee: Industrial Spring Company
- Current Assignee: Industrial Spring Company
- Current Assignee Address: US MN Coon Rapids
- Agency: Westman, Champlin & Kelly, P.A.
- Agent James L. Young
- Main IPC: E05F11/00
- IPC: E05F11/00
Abstract:
A spring assembly is provided for an upward acting door that travels on a travel path while opening. The assembly includes a shaft, a torsion spring and a second spring. The torsion spring is connected to the shaft and provides a lifting force for the door throughout the travel path. The second spring is connected to the shaft and provides a lifting force for the door during only a portion of the travel path. In another aspect, a spring assembly is provided for an upward acting door that travels on a travel path while closing. The torsion spring is connected to the shaft and provides a weight supporting force for the door throughout the travel path. The second spring is connected to the shaft and provides a weight supporting force for the door during only a portion of the travel path.
Information query
