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US3734112A
Expired / Lapsed
US
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Method of tapping a hole in a main through a fitting
Assignee: Mueller Co
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Filing: 1971-03-10
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Granted: 1973-05-22
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Expires: 1991-03-10
Abstract
Abstract A method for opening a flow-way in a main when a main is to be connected to a secondary main or service line. In opening the flow-way in the main, a perforator or tapping tool is utilized, which will progressively form the hole or aperture in the main by upsetting the material of the main outwardly of the same into the through bore of a fitting attached to the main, the upset material acting as a mechanical fastening means for increasing the resistance of a fitting to twist about the axis or center line of the main.
Inventors
- 👤 R Finney
- 👤 L Luckenbill
- 👤 G Kissell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:48
CPC Classifications
F; F16; F16L; F16L41/00; F16L41/04; F16L41/06; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0402; Y10T137/0441; Y10T137/0458; Y10T137/0463; Y10T137/598; Y10T137/612; Y10T137/6123
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A method of tapping a hole in a main through a through bore in a fitting at least temporarily secured to the main, the fitting having a tapping tool with a threaded tapered portion for progressively forming the hole, the steps comprising: advancing and rotating the tapping tool toward and into engagement with the advancement per each revolution of the same being controlled to be less than the lead of the thread on the threaded tapered portion, causing the material around the hole being formed in the main to be swaged outwardly of the main into the through bore of the fitting to thereby eliminate obstruction within the main and to thereby provide a mechanical fastening between the main and the fitting to increase resistance of the fitting from twisting about the axis of the main.
Claim 2
Independent Claim
136 words
A method of tapping a hole in a main through a through bore in a fitting at least temporarily secured to the main, the fitting having a tapping tool with a threaded tapered portion for progressively forming the hole, the steps comprising: advancing and rotating the tapping tool toward and into engagement with the advancement per each revolution of the same being controlled to be less than the lead of the thread on the threaded tapered portion, causing the material around the hole being formed in the main to be swaged outwardly of the main into the through bore of the fitting to thereby eliminate obstruction within the main and to thereby provide a mechanical fastening between the main and the fitting to increase resistance of the fitting from twisting about the axis of the main.
Claim 3
Dependent Claim
37 words
A method as claimed in claim 1 including swaging the material upset by the threaded portion of the tool in a generally radial outward direction into engagement with the wall of the through bore in the fitting.
Claim 4
Dependent Claim
65 words
A method as claimed in claim 2, including the step of preliminarily cutting a hole in the main of a smaller diameter than a predetermined desired diameter, and then upsetting the material around the hole in the main to enlarge the hole to the predetermined diameter, the material being upset radially outwardly of the axis of the main into the through bore of the fitting.
Claim 5
Dependent Claim
19 words
A method as claimed in claim 3, including reinforcing the interior of the upset material defining the finished hole.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |