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:
Jan. 03, 1984
Filed:
Feb. 18, 1981
Horace D Holmes, Farmington Hills, MI (US);
Other;
Abstract
A tapered tap suitable for producing tapered pipe threads includes a body provided with a helical thread form having a tapered cross-sectional shape. The thread form is defined by a pair of converging flanks which form a thread crest and thread root respectively lying along inner and outer converging axes. In one embodiment, a portion of the thread crest is radially offset from the outer axis and generates a tapped female thread in which a portion of the tapped thread root is of reduced diameter; the thread root of reduced diameter firmly engages and deforms the crest of a standard male tapered thread to assure that at least a portion of the helical tunnel between the male and female threads is completely sealed to prevent fluid leaks therethrough. In another embodiment, a portion of the thread root of the tap is also radially offset from the inner axis to generate a tapped thread crest of reduced diameter which deforms upon engagement with a standard male tapered thread, thereby improving the seal.