Fastener head with internal recess having a radial slot configuration and installation tool therefor
Patent 5366330 Issued on November 22, 1994. Estimated Expiration Date: 
July 26, 2013. 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 26, 2013. 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 References 2129440 3331274 3604305 Configuration for nuts and bolt heads Recessed head screw Patent #: 4202244 InventorAssigneeApplicationNo. 096233 filed on 07/26/1993US Classes:411/405, Opposed open ended plural slots, e.g., spanner, etc.81/176.15, Having means to engage work axially411/407, Having driver retaining means411/919SCREW HAVING DRIVING CONTACTSExaminersPrimary: Wilson, Neill R.Attorney, Agent or FirmInternational ClassesF16B 023/00F16B 035/06 AbstractA fastener head having a pair of recesses formed therein, a ledge in each recess being located a short distance axially below the head surface and extending a predetermined angular length from the axial portion of the ledge. The dimension of the ledge is adjustable to accommodate the strength of the fastener material in a manner such that the displacement formation of recess material on the surface of the fastener head is prevented during normal installation procedures. The drive angle on the recess is designed to be zero degrees. | |
