Portable handheld power-driven tool
Patent 4828049 Issued on May 9, 1989. Estimated Expiration Date: 
October 9, 2007. 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.
October 9, 2007. 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 References3195704 InventorAssigneeApplicationNo. 07/107360 filed on 10/09/1987US Classes:173/217, Electric motor81/57.11With motorExaminersPrimary: Yost, Frank T.Assistant: Wolfe, James L. Attorney, Agent or FirmInternational ClassesB25B 21/00 (20060101)B23B 45/00 (20060101) B25F 5/00 (20060101) Foreign Application Priority Data1986-10-24 DEAbstractAn electric handtool includes a two-stage speed reduction gear unit in which each stage includes a sun gear and two planet gears carried by a carrier. The carrier of the first stage has a small diameter hexagonal first socket for receiving and entraining, for example, the shank of a chuck. The carrier of the second stage has a large diameter hexagonal second socket for receiving and entraining, for example, the shank of a screwdriver bit as well as a passage bore to provide access to the first socket. The socket and bore in the second stage are dimensioned so that the shank of the chuck can extend therethrough without being entrained thereby. | |
