US3848638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe repair clamp
Assignee: Dresser Industries Inc
•
Filing: 1973-05-24
•
Granted: 1974-11-19
•
Expires: 1993-05-24
Abstract
Abstract A pipe repair clamp affording wide range of circumferential adjustment to accommodate dimensional variations from nominal pipe size. A flexible band is adapted to partially encircle a pipe section on which it can be drawn tight by means of bolt adjustable lug assemblies secured at each end. The band supports a resilient gasket on its inner face while a spanner element is secured by the band ends to bridge the circumferential gap therebetween. Longitudinally secured to the spanner element centrally intermediate the lugs is a spanner bar serving both as an anchor for one end of the lug adjustment bolts and as a base to resist turning moment of the lugs when the latter are tightened during installation of the clamp onto a pipe.
Inventors
- 👤 W Huslander
- 👤 C Glover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:24
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/168; F16L55/17; F16L55/172; Y; Y10; Y10T; Y10T24/00; Y10T24/14; Y10T24/1412; Y10T24/1441
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
164 words
In a pipe repair clamp including a flexible band for encircling a substantial circumferential portion of pipe section to be repaired, lug means secured to each of the circumferential opposing ends of said band, held bolt fasteners engageable with said lug means on the respective band ends and adapted to apply a generally circumferentially effective first force for tightened installation takeup of said band about a contained pipe section, a spanner plate positioned circumferentially encircling a portion of pipe section between the opposing ends of said band and gasket means circumferentially underlying said band and spanner plate for engagement against the peripheral surface of a contained pipe section, force applicator means adapted to cooperate with said lug means and responsive to tightened installation takeup of said band to apply a second force separately effective from said first force for locally increasing radially inward clamping force between said gasket and said spanner plate at a location on said spanner plate circumferentially intermediate said lug means.
Claim 2
Dependent Claim
164 words
In a pipe repair clamp including a flexible band for encircling a substantial circumferential portion of pipe section to be repaired, lug means secured to each of the circumferential opposing ends of said band, held bolt fasteners engageable with said lug means on the respective band ends and adapted to apply a generally circumferentially effective first force for tightened installation takeup of said band about a contained pipe section, a spanner plate positioned circumferentially encircling a portion of pipe section between the opposing ends of said band and gasket means circumferentially underlying said band and spanner plate for engagement against the peripheral surface of a contained pipe section, force applicator means adapted to cooperate with said lug means and responsive to tightened installation takeup of said band to apply a second force separately effective from said first force for locally increasing radially inward clamping force between said gasket and said spanner plate at a location on said spanner plate circumferentially intermediate said lug means.
Claim 3
Dependent Claim
25 words
In a pipe repair clamp according to claim 1 in which said force applicator means comprises a spanner bar supported longitudinally on said spanner plate.
Claim 4
Dependent Claim
37 words
In a pipe repair clamp according to claim 2 in which said spanner bar includes means to anchor one end of said bolt fasteners and from which the bolt fasteners extend bi-directionally therefrom to respective lug means.
Claim 5
Dependent Claim
51 words
In a pipe repair clamp according to claim 3 in which half of the bolt fasteners extend from said spanner bar in one direction to first of said lug means and half of the bolt fasteners extend from said spanner bar in the opposite direction to second of said lug means.
Claim 6
Dependent Claim
53 words
In a pipe repair clamp according to claim 4 in which said bolt fasteners are substanTially aligned in pairs with one of each pair extending on one direction to the first of said lug means and the other of each pair extending in the opposite direction to the second of said lug means.
Claim 7
Dependent Claim
49 words
In a pipe repair clamp according to claim 5 in which said spanner bar is fixedly attached to said spanner plate at an arcuately intermediate location thereon and is generally U-shaped in cross section defining a centrally open cavity in which to receive one end of said bolt fasteners.
Claim 8
Dependent Claim
31 words
In a pipe repair clamp according to claim 6 in which the longitudinal side walls of said U-shape spanner bar extend substantially radially from the supporting surface of said spanner plate.
Claim 9
Dependent Claim
61 words
In a pipe repair clamp according to claim 6 in which said lug means includes torque arms integrally extending from the lug portion thereof to the vicinity of said spanner bar and said spanner bar includes means defining a bearing surface engageable by an extended portion of said torque arms for said bearing surface to resist the takeup turning moment thereof.
Claim 10
Dependent Claim
47 words
In a pipe repair clamp according to claim 8 in which each of said lug means includes a plurality of longitudinally spaced apart torque arms laterally engaging said spanner bar with the torque arms of the opposite lug means being alternately staggered with respect to each other.
Claim 11
Dependent Claim
37 words
In a pipe repair clamp according to claim 8 in which said bearing surface defining means comprises a plurality of longitudinally spaced webs extending transversely in said spanner bar cavity at coincident locations of said torque arms.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |