Quick-bolt locking system
Patent 4638994 Issued on January 27, 1987. Estimated Expiration Date: 
July 30, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 30, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 06/636121 filed on 07/30/1984US Classes:482/107, Having securing member (e.g., locking collar, etc.) for retaining weight on bar403/261, Coaxial collar or shoulder or rod is clamp element403/343, SCREW OR CAM411/417, Circumferentially interrupted thread482/108Bar held by single hand of user (e.g., dumbbell, etc.)ExaminersPrimary: Apley, Richard J.Assistant: Bahr, Robert Attorney, Agent or FirmInternational ClassesA63B 21/06 (20060101)A63B 21/072 (20060101) AbstractA tubular main bar, internally threaded, with buttress teeth, from each end, with a stop in the middle, and an inner bar inserted in each end, having a single tooth element, spring pressed radially outwardly, forming a buttress tooth engaging the buttress teeth in the main bar. The inner bars can be pushed inwardly, but must be threaded, or turned, out. The weights are fitted on the inner bar at each end, against the end of the main bar and a locking collar interlocks with the outer end of each inner bar, and holds the weights. The outer surface of the locking collar and of the inner bar lie in a common plane, defining the end of the dumbbell. The inner bars cannot be threaded completely out of the main bar, except by special manipulation of the tooth element in the inner bar, through an inconsipicuous opening. | |
