US3783176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Connection between electrical conduit and enclosure, and method
Assignee: MARKSTONE Manufacturing
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Filing: 1972-12-04
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Granted: 1974-01-01
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Expires: 1992-12-04
Abstract
Abstract A connection between a metal electric conduit and a metal enclosure wall is made by punching a hole in the wall which is circular except for the end portion of a tongue that extends into one side of the circle, shearing two slits in the wall which intersect the hole and define the sides of the tongue, bending the tongue out of the plane of the wall sufficiently to withdraw its end portion from the hole so the latter is effectively round, inserting the end of the conduit, and pressing the tongue back substantially into the plane of the wall to clamp the conduit in the hole.
Inventors
- 👤 A Lund
- 👤 J Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:16
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/02; H02G3/08; H02G3/081; H02G3/083; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49925
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
180 words
A method of connecting the open end portion of a metal conduit for electric conductor wires through a metal wall of an enclosure, so that wires in the conduit may be spliced within said enclosure, said method comprising the steps of: punching a hole in said wall which is substantially circular except for the end portion of a tongue which extends into one side of the circle, said hole having a major axis slightly longer than the outside diameter of the conduit and a minor axis substantially bisecting the tongue which is shorter than said outside diameter; cutting two slits in the wall which intersect the hole and define the sides of said tongue; bending said tongue out of the plane of the wall to extend the effective length of the minor axis so it is no less than the major axis; inserting the open end portion of the conduit through said hole; and pressing the tongue toward the plane of the wall to clamp the conduit between the end of the tongue and the opposite side of the hole.
Claim 2
Independent Claim
180 words
A method of connecting the open end portion of a metal conduit for electric conductor wires through a metal wall of an enclosure, so that wires in the conduit may be spliced within said enclosure, said method comprising the steps of: punching a hole in said wall which is substantially circular except for the end portion of a tongue which extends into one side of the circle, said hole having a major axis slightly longer than the outside diameter of the conduit and a minor axis substantially bisecting the tongue which is shorter than said outside diameter; cutting two slits in the wall which intersect the hole and define the sides of said tongue; bending said tongue out of the plane of the wall to extend the effective length of the minor axis so it is no less than the major axis; inserting the open end portion of the conduit through said hole; and pressing the tongue toward the plane of the wall to clamp the conduit between the end of the tongue and the opposite side of the hole.
Claim 3
Dependent Claim
44 words
The method of claim 1 in which the tongue is bent along its base to incline it with respect to the wall and is also bent intermediate its ends so the free end of the tongue is substantially in the plane of the wall.
Claim 4
Dependent Claim
20 words
The method of claim 2 in which the tongue is bent along its base toward the rear of the wall.
Claim 5
Dependent Claim
20 words
The method of claim 1 in which the tongue is bent along its base toward the rear of the wall.
Claim 6
Dependent Claim
30 words
The method of claim 1 in which the slits diverge slightly away from the hole, so the free end of the tongue may remain in the plane of the wall.
Claim 7
Dependent Claim
28 words
The method of claim 1 in which the conduit is BX, and the minor axis of the hole is shorter than the smaller outside diameter of the BX.
Claim 8
Dependent Claim
168 words
In an electrical device, in combination: a metal enclosure having a wall in which there is a hole which is substantially circular except for the end portion of a tongue which extends into one side of the circle, so the hole has a major axis, and a minor axis substantially bisecting the tongue; two slits in said wall which intersect said one side of the hole and define the sides of the tongue, said end of said tongue being substantially in the plane of the wall, and said tongue having a bend line across its base; and a metal conduit for electrical conductor wires which extends through said hole and has an open end in the enclosure, the outside diameter of said conduit being slightly less than the length of the major axis of the hole and slightly greater than the length of the minor axis of said hole, and said conduit being clamped between the free end of the tongue and the oppOsite side of the hole.
Claim 9
Dependent Claim
168 words
In an electrical device, in combination: a metal enclosure having a wall in which there is a hole which is substantially circular except for the end portion of a tongue which extends into one side of the circle, so the hole has a major axis, and a minor axis substantially bisecting the tongue; two slits in said wall which intersect said one side of the hole and define the sides of the tongue, said end of said tongue being substantially in the plane of the wall, and said tongue having a bend line across its base; and a metal conduit for electrical conductor wires which extends through said hole and has an open end in the enclosure, the outside diameter of said conduit being slightly less than the length of the major axis of the hole and slightly greater than the length of the minor axis of said hole, and said conduit being clamped between the free end of the tongue and the oppOsite side of the hole.
Claim 10
Dependent Claim
18 words
The combination of claim 7 in which the tongue is displaced slightly toward the inside of the enclosure.
Claim 11
Dependent Claim
33 words
The combination of claim 8 in which the tongue has a first bend line where it joins the wall and a second bend line intermediate said first bend line and its free end.
Claim 12
Dependent Claim
28 words
The combination of claim 7 in which the conduit is BX and the minor axis of the hole is slightly shorter than the smaller diameter of the conduit.
Claim 13
Dependent Claim
140 words
In a wiring box for splicing electrical conduit wires: a wall in which there is a hole which is substantially circular and of a diameter slightly greater than that of an electrical conduit which may be inserted through said hole; and a tongue formed in said wall, said tongue having a base joining the wall and a free end immediately adjacent a side of the hole, a first transverse bend substantially at said base and a second transverse bend between the base and the free end, so that the tongue between its base and its free end is out of the plane of the wall, whereby said tongue may be bent toward the plane of the wall to move its free end into the hole and clamp a conduit between said free end and the opposite side of the hole.
Claim 14
Dependent Claim
140 words
In a wiring box for splicing electrical conduit wires: a wall in which there is a hole which is substantially circular and of a diameter slightly greater than that of an electrical conduit which may be inserted through said hole; and a tongue formed in said wall, said tongue having a base joining the wall and a free end immediately adjacent a side of the hole, a first transverse bend substantially at said base and a second transverse bend between the base and the free end, so that the tongue between its base and its free end is out of the plane of the wall, whereby said tongue may be bent toward the plane of the wall to move its free end into the hole and clamp a conduit between said free end and the opposite side of the hole.
Claim 15
Dependent Claim
14 words
The wiring box of claim 11 in which the tongue is within the box.
Claim 16
Dependent Claim
32 words
The wiring box of claim 11 in which the second transverse bend of the tongue is such that the free end of the tongue is substantially in the plane of the wall.
Claim 17
Dependent Claim
29 words
The wiring box of claim 13 in which the tongue tapers from its base to its free end, and the free end is in the plane of the wall.
References Cited (Backward Citations)
US2120993A
Cited
US3181584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |