Patent US4762444A successfully refreshed from Google Patents.
US4762444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw tap with lubrication and extraction bores
Assignee: Individual
•
Filing: 1987-03-16
•
Granted: 1988-08-09
•
Expires: 2007-03-16
Abstract
Abstract A tap for forming threads on the inside of a bore which includes a hexagonal central pilot bore and transverse dihedral shafts constituting means for extracting a tap broken within a bore and also constituting means for depositing lubrication or coolant or introducing pressurized air to the cutting dies of the tap. Slots are formed in the distal end of the tap to allow a flat bladed instrument to be inserted for removal of a broken tap part.
Inventors
- 👤 Carl M. Mena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:02
CPC Classifications
B; B23; B23G; B23G5/00; B23G5/02; B23G5/06; B23G5/005; B23G5/068; Y; Y10; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455; Y10T408/89; Y10T408/904; Y10T408/9048
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A tap for forming internal threads on the inner wall of a bore, said tap including a longitudinally extending shank portion and an external threaded portion, said threaded portion being interrupted by at least one but less than six longitudinally extending flutes, said threaded portion terminating in a distal end, and a longitudinal cavity in the tap, said longitudinal cavity having an hexagonal cross-section and constituting means for rotating said tap by a mating tool having an hexagonal cross-section.
Claim 2
Dependent Claim
79 words
A tap for forming internal threads on the inner wall of a bore, said tap including a longitudinally extending shank portion and an external threaded portion, said threaded portion being interrupted by at least one but less than six longitudinally extending flutes, said threaded portion terminating in a distal end, and a longitudinal cavity in the tap, said longitudinal cavity having an hexagonal cross-section and constituting means for rotating said tap by a mating tool having an hexagonal cross-section.
Claim 3
Dependent Claim
35 words
The tap of claim 1 including at least one radial cavity extending between said longitudinal cavity and flute for introducing a liquid through the tap to the threaded portion to contact said inner bore wall.
Claim 4
Dependent Claim
27 words
The tap of claim 2 wherein said radial cavity extends from said longitudinal cavity at an acute angle and terminates in said flute near said distal end.
Claim 5
Dependent Claim
31 words
The tap of claim 2 wherein said longitudinal cavity extends to said distal end, and a plug is fitted within said longitudinal cavity between said distal end and said radial cavity.
Claim 6
Dependent Claim
16 words
The tap of claim 1 wherein said longitudinal cavity extends through said shank and threaded portions.
Claim 7
Dependent Claim
24 words
The tap of claim 1 including transverse slots in said distal end for accommodating a bladed extraction tool for axial rotation of said tap.
Claim 8
Dependent Claim
17 words
The tap of claim 1 wherein the longitudinal cavity extends through the entire length of the tap.
Claim 9
Dependent Claim
18 words
The tap of claim 1 wherein the longitudinal cavity extends from said distal end into said threaded portion.
Claim 10
Dependent Claim
14 words
The tap of claim 1 wherein the number of longitudinally extending flutes is four.
Claim 11
Dependent Claim
86 words
A tap for forming internal threads on the inner wall of a bore, said tap including a longitudinally extending shank portion and an external threaded portion, said threaded portion being interrupted by at least one longitudinally extending flute, said threaded portion terminating in a distal end, and a longitudinal cavity in the tap, said longitudinal cavity having a polygonal cross-section and constituting means for rotating said tap with a mating tool, the polygonal cross-section having a number of sides greater than the number of longitudinal flutes.
Claim 12
Dependent Claim
86 words
A tap for forming internal threads on the inner wall of a bore, said tap including a longitudinally extending shank portion and an external threaded portion, said threaded portion being interrupted by at least one longitudinally extending flute, said threaded portion terminating in a distal end, and a longitudinal cavity in the tap, said longitudinal cavity having a polygonal cross-section and constituting means for rotating said tap with a mating tool, the polygonal cross-section having a number of sides greater than the number of longitudinal flutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |