Patent US4150250A successfully refreshed from Google Patents.
US4150250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strain relief fitting
Assignee: SPX Technologies Inc
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Filing: 1977-07-01
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Granted: 1979-04-17
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Expires: 1997-07-01
Abstract
Abstract In many assemblies it is desirable to provide a strain relief device to grip an electric cord to prevent longitudinal motion of the cord, with respect to the strain relief device. The disclosed strain relief member surrounds the electric cord and is enclosed within a body member which, when assembled, applies longitudinal compressive forces on said strain relief member to cause a central portion thereof to collapse axially inward and grippingly engage the electric cord. The central portion may include serrations for improved restraining of the cord. The strain relief member may be made of plastic or metal and may include central perforations and/or portions of different thicknesses to facilitate and control the collapse. A metallic strain relief member may serve ground metal sheathed cable. A resilient membrane in a plane normal to the longitudinal axis of the cord and the strain relief member may be used between the strain relief member and the body member to provide a liquid tight seal. The collapsing feature of the strain relief member permits a strain relief member of predetermined proportions and characteristics to be used with a wide range of cable sizes.
Inventors
- 👤 Russell E. Lundeberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:43
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/02; H02G3/06; H02G3/0616; H02G3/0625; H02G3/065
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
134 words
A cord grip for restraining a cord against longitudinal motion with respect to said cord grip and comprising in combination: (a) a cylindrical shell extending longitudinally about an axis and having first and second ends for loosely surrounding a cord to be restrained; (b) said cylindrical shell including a plurality of spaced apart members connecting said first and second ends; (c) each of said spaced apart members being similar and having an upper, a lower and a central section having a thinner wall thickness than other portions of said spaced apart members; and wherein (d) the interior diameter of said cylindrical shell has a minimum value in the plane of said central section whereby said spaced apart members will collapse radially inward in said plane in response to axial compressive forces on said ends.
Claim 2
Dependent Claim
134 words
A cord grip for restraining a cord against longitudinal motion with respect to said cord grip and comprising in combination: (a) a cylindrical shell extending longitudinally about an axis and having first and second ends for loosely surrounding a cord to be restrained; (b) said cylindrical shell including a plurality of spaced apart members connecting said first and second ends; (c) each of said spaced apart members being similar and having an upper, a lower and a central section having a thinner wall thickness than other portions of said spaced apart members; and wherein (d) the interior diameter of said cylindrical shell has a minimum value in the plane of said central section whereby said spaced apart members will collapse radially inward in said plane in response to axial compressive forces on said ends.
Claim 3
Dependent Claim
30 words
The combination as set forth in claim 1, wherein the separation between said spaced apart members is reduced in response to the radial inward collapse of said spaced apart members.
Claim 4
Dependent Claim
71 words
The combination as set forth in claim 9, wherein the width of the separation between said spaced apart members limits the maximum extent of the radial inward collapse of said spaced apart members by the edges of said spaced apart members contacting each other as the width of said separation at, at least, one point is reduced to zero in response to the radial inward collapse of said spaced apart members.
Claim 5
Dependent Claim
20 words
The combination as set forth in claim 1, wherein the interior surface of said spaced apart members includes surface irregularities.
Claim 6
Dependent Claim
23 words
The combination as set forth in claim 4, wherein said surface irregularities are situated on said central portion of said spaced apart members.
Claim 7
Dependent Claim
28 words
The combination as set forth in claim 1 and including a sealing grommet for restricting the transfer of liquids from one side of said grommet to the other.
Claim 8
Dependent Claim
20 words
The combination as set forth in claim 6, wherein said sealing grommet comprises a disc portion with a central opening.
Claim 9
Dependent Claim
28 words
The combination as set forth in claim 7 and including a body member comprising first and second members threadingly engaged and enclosing said cylindrical shell and said grommet.
Claim 10
Dependent Claim
41 words
The combination as set forth in claim 8, wherein said first and second members include first and second surfaces, respectively, with said first surface contacting said first end, and with said grommet situated between said second end and said second surface.
Claim 11
Dependent Claim
25 words
The combination as set forth in claim 1 and including a body member comprising first and second members threadingly engaged and enclosing said cylindrical shell.
Claim 12
Dependent Claim
28 words
The combination as set forth in claim 10, wherein said first and second members include first and second surfaces, respectively, for contacting said first and second ends, respectively.
Claim 13
Dependent Claim
47 words
The combination as set forth in claim 11, wherein said first and second surfaces exert compressive axial forces on said first and second ends when said first and second surfaces are brought closer together in response to an increased threading engagement between said first and second members.
Claim 14
Dependent Claim
16 words
The combination as set forth in claim 1, wherein said cylindrical shell comprises a nonconducting material.
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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |