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US3760341A - Connecting adapter for electric cable and fuse - Google Patents

Connecting adapter for electric cable and fuse Download PDF

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Publication number
US3760341A
US3760341A US3760341DA US3760341A US 3760341 A US3760341 A US 3760341A US 3760341D A US3760341D A US 3760341DA US 3760341 A US3760341 A US 3760341A
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Patent type
Prior art keywords
adapter
surface
blade
clamping
fuse
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Inventor
J Grad
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R4/00Electrically-conductive connections between two or more conductive members in direct contact and means for effecting or maintaining such contact
    • H01R4/28Clamped connections, spring connections
    • H01R4/38Clamped connections, spring connections utilising a clamping member acted on by screw or nut
    • H01R4/46Clamping area between two screws placed side by side
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R4/00Electrically-conductive connections between two or more conductive members in direct contact and means for effecting or maintaining such contact
    • H01R4/28Clamped connections, spring connections
    • H01R4/30Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36Conductive members located under tip of screw
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S439/00Electrical connectors
    • Y10S439/957Auxiliary contact part for circuit adaptation

Abstract

An adapter for connecting an electric cable to a blade-type fuse characterized by two metal bodies, one of the bodies having a cable-receiving aperture and having a projecting portion extending from one side thereof, and the other body having a clamping surface adapted to receive the projecting portion in surface-to-surface contact. The adapter also includes clamping means associated with the clamping surface for retaining the projecting portion and a blade of a blade-type fuse in surfaceto-surface contact with each other.

Description

ilnited States atent [1 1 Grad [ Sept. 18, 1973 1 CONNECTING ADAPTER FOR ELECTRIC CABLE AND FUSE [75] Inventor: John E. Grad, Beaver, Pa.

[73 Assignee: Westinghouse Electric Corporation,

Pittsburgh, Pa.

22 Filed: Feb. 22, 1972 211 App]. No.: 228,134

[52] 11.8. C1 339/265 F, 339/272 R [51] Int. Cl H01! 7/26, I-IOlr 7/12 [58] Field of Search 339/31 R, 233, 237,

[56] References Cited UNITED STATES PATENTS 561,159 6/1896 Downes 339/266 F 2,841,774 7/1958 Romanek;

281,576 7/1883 Stieringer 337/188 FOREIGN PATENTS OR APPLICATIONS 3/1942' Germany 339/249 S OTHER PUBLICATIONS Electrical World; Dec, 1965.

Primary ExaminerMarvin A. Champion Assistant ExaminerLawrence J. Staab Attorney-A. T. Stratton et a1.

[57] ABSTRACT An adapter for connecting an electric cable to a bladetype fuse characterized by two metal bodies, one of the bodies having a cable-receiving aperture and having a projecting portion extending from one side thereof, and the other body having a clamping surface adapted to receive the projecting portion in surface-to-surface contact. The adapter also includes clamping means associated with the clamping surface for retaining the projecting portion and a blade of a blade-type fuse in surface-to-surface contact with each other.

2 Claims, 6 Drawing Figures PATENTED SEN 8 I975 SHEEI 1 0F 2 CROSS-REFERENCE TO RELATED APPLICATION This invention is related to the invention disclosed in the application of James B. Wallace et al, Ser. No. 228,133, filed Feb. 22, 1972.

BACKGROUND OF THE INVENTION switch equipment such as panelboardnection between the jaws and a blade of a blade-type I fuse. The helper springs are necessary to maintain pressure on the jaws to carry the current and to avoid overheating between the bladeand the fuse jaws which overheating otherwise occurs between loose connections. A disadvantage of the helper springs, however, has been substantial difficulty of inserting a fuse blade between the jaws. Indeed, it has become a practice to drive the blades into the jaws with a mallet or other appropriate tool. As a result, the insulating bases of resinous material in which the jaws are mounted are frequently broken.

Associated with the foregoing have been problems of assembly and production costs of the switches having fuse jaws adapted to accept blade-type fuses.

SUMMARY OF THE INVENTION In accordance with this invention it has been found that the foregoing problems may be overcome by providing an adapter for connecting one or more electric face for retaining the projecting body portion and a' blade of a blade-type fuse in surface-to-surface contact with each other.

The advantage of the adapter is that it combines a fuse clamp and a wire or cable terminal into two metal bodies which are readily secured together with'good electrical joints and thereby avoid sources of hot spots.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a plan view, with parts broken away, of a multipole circuit interrupting device constructed in accordance with the principles of this invention;

FIG. 2 is an enlarged, fragmentary, side elevational view of the adapter of this invention;

FIG. 3 is a sectional view taken on the line III'III of FIG. 2; 7

FIG. 4 is an isometric view of the adapter; and

FIGS. 5 and 6 are isometric views of other embodiments of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention is illustrated as applied to a circuit interrupter having an operating and contact mechanism of the type fully disclosed in U.S. Pat. No. 3,538,287, issued Nov. 3, 1970, to S. A. Mrenna, and assigned to the assignee of the instant invention. For a complete understanding of the structure and operation of the circuit interrupter mechanism, reference may be made to said U.S. Pat. No. 3,538,287. For brevity a limited description is made of the circuit interrupter with which the adapter of this invention may be used.

As shown in FIGS. 1 and 2 of the drawings there is disclosed a circuit interrupter 5 comprising an enclosure 7 and an externally operable circuit interrupter 9 supported on the enclosure 7. The enclosure comprises a receptacle part 11 and an openable cover 13 supported on the receptacle part for movement about hinges 15. The circuit interrupter 9 is a three-pole circuit interrupter comprising a switch structure 17 and a fuse structure 19. The switch structure 17 comprises contact means 21 for each pole and a common externally operable operating mechanism 23 for simultaneously opening the three-pole units.

The operating mechanism 23 comprises an elongated handle lever 25 that is fixed at the inner end thereof to a rod 29 that extends through an opening in the side wall of the receptacle. The lever 25 moves within a metallic hood 31 that is supported on the external side of the receptacle. The circuit interrupting device 5 also includes a movable contact structure 33 which is movable between opened and closed circuit positions with a stationary contact structure 35 by manual operation of the handle lever 25 in a manner set forth in U.S. Pat. No. 3,538,287.

With the circuit interrupter in the closed position, the circuit through each pole unit extends from a terminal connector 37 that is secured to the stationary contact structure 35, the movable contact structure 33, a conducting blade 39, a fuse 41, and an adapter generally indicated at 43 which includes a terminal connector or body member 45. The fuse 41 includes flat plate terminals or blades 47 and 49, the former of which is connected to the conducting plate 39 and the latter of which is connected to the adapter 43.

In accordance with this invention, the adapter 43 connects the blade 49 to a cable 77 (FIG. 3). For that purpose as shown more particularly in FIGS. 2, 3, and 4 the adapter comprises two metallic bodies (preferably composed of aluminum or copper) including the terminal connector 45 and a bracket 51. The connector 45 includes a projection 53 extending from one side thereof which projection is clamped in surface-tosurface electrical contact with the blade 49. The adapter 43 includes clamping means for holding the projection 53 and the blade 49 together.,The clamping means comprises a clamping structure generally indicated at 55 and includes a pressure bar 57 and a pair of bolts 59 for holding opposite ends of the bar in place on the bracket 511.

As shown more particularly in FIGS. 3 and 4, the bracket Sll is preferably provided with a notch 61 in which the projection 53 and the blade 49 are seated for maintaining the projection and the blade in fixed aligned positions with respect to each other. Thus the projection 53 and the blade 49 are secured between a bottom wall 63 of the notch 61 and the pressure bar 57 where they are held in tight frictional contact with each other to provide a good electrical current path therethrough.

In addition, the bracket 51 may be provided with a bolt 65 (FIG. 3) for holding a projection 53 in place within the notch 61 particularly when the fuse 51 is removed or replaced; thereby facilitating handling of the several parts.

In addition, the bracket 51 is provided with a mounting flange 67 having spaced apertures 69 by which the adapter 43 is retained in place within the closure 7. The adapter 43 is mounted on a block 71 which is composed of an electrically insulating material and which in turn is secured by suitable means such as space screws 73 to the bottom surface of the enclosure 7. For that purpose bolts (not shown) extend through the aperture 69 and into the block 71.

As shown in FIG. 3 the terminal connector 45 includes an aperture 75 in which the end portion of a wire or cable 77 is secured by suitable clamping means such as a set screw 79.

Another embodiment of the invention is shown in FIG. in which parts similar to those of the embodiment shown in FIGS. 1 to 4 are identified with similar reference numbers. An adapter generally indicated at 81 is a metallic body having aperture means such as a pair of spaced apertures 83, a clamping surface 85, and a mounting flange 87. The adapter 81 is also provided with suitable clamping means which includes the pressure bar 57 and spaced bolts 59, the latter of which are secured in threaded apertures in the adapter. Accordingly, the blade 49 of a fuse 51 is retained by the pressure bar 57 against the clamping surface 85 of the adapter 81 in surface-to-surface electrical contact. Suitable clamping means such as a set screw 89 for each aperture 83 are also provided for retaining a cable (not shown) in the apertures in a manner similar to that shown in FIG. 3.

In FIG. 6 another embodiment of the invention includes an adapter generally indicated at 91 which is provided with aperture means such as an aperture 93, a clamping surface 95, and a mounting flange 97. The clamping means for holding the blade 49 of the fuse 41 in electrical contact with the clamping surface 95 of the adapter 91 is a bolt 99, the lower end of which is seated in a threaded aperture (not shown) in the adapter 91. Finally, clamping means such as a set screw 101 is provided with the aperture 93 for retaining a cable in place in a manner similar to that shown in FIG. 3.

Accordingly, the adapter of the present invention satisfies disadvantages and problems inherent in prior known devices for connecting electrical cables to bladetype fuses, and satisfies a long standing need for a connector by reducing the number of connecting surfaces between the fuse and the cable, thereby eliminating the sources of so-called hot spots which otherwise occur where loose contacting surfaces exist.

What is claimed is:

1. An adapter for connecting an electric cable to a blade-type fuse, the adapter comprising two metal bodies, one of which bodies includes at least one cablereceiving aperture and a set screw threadedly seated in the body and movable into the aperture, said one body also comprising a projection extending outwardly from one side thereof, the other of which bodies includes a notch the bottom surface of which is a clamping surface, the projection being seated in the notch, and clamping means associated with the clamping surface for holding the projection and the blade in surface-tosurface contact with each other.

2. The adapter of claim 1 in which the projection and a blade of a blade-type fuse are seated in the notch, and the clamping means comprises a pressure bar disposed across the notch.

Claims (2)

1. An adapter for connecting an electric cable to a blade-type fuse, the adapter comprising two metal bodies, one of which bodies includes at least one cable-receiving aperture and a set screw threadedly seated in the body and movable into the aperture, said one body also comprising a projection extending outwardly from one side thereof, the other of which bodies includes a notch the bottom surface of which is a clamping surface, the projection being seated in the notch, and clamping means associated with the clamping surface for holding the projection and the blade in surface-to-surface contact with each other.
2. The adapter of claim 1 in which the projection and a blade of a blade-type fuse are seated in the notch, and the clamping means comprises a pressure bar disposed across the notch.
US3760341A 1972-02-22 1972-02-22 Connecting adapter for electric cable and fuse Expired - Lifetime US3760341A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923363A (en) * 1974-08-16 1975-12-02 Fargo Mfg Co Inc Hot line connector
US4327957A (en) * 1979-12-05 1982-05-04 International Telephone And Telegraph Corporation Electrical terminal lug
US4422712A (en) * 1980-10-28 1983-12-27 Siemens Aktiengesellschaft Housed contact arrangement for a tubular lamp
US4784621A (en) * 1987-09-14 1988-11-15 Auclair William T Wire connector
US4917615A (en) * 1988-11-18 1990-04-17 Franks George J Jr Ground bracket
US5201678A (en) * 1991-11-06 1993-04-13 Homac Mfg. Company Set screw bus connector
US6031446A (en) * 1999-03-09 2000-02-29 Eaton Corporation Combination fuse clip and line terminal connection device
USD486791S1 (en) 2003-01-29 2004-02-17 Senior Industries, Inc. Ground block
USD487427S1 (en) 2003-01-29 2004-03-09 Senior Industries, Inc. Ground block
US6877996B1 (en) 2002-11-27 2005-04-12 Senior Industries, Inc. Grounding connector
US20090160597A1 (en) * 2007-12-21 2009-06-25 Thomas & Betts International, Inc. High Voltage Fuse With Universal Fuse Terminal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US281576A (en) * 1883-07-17 Luther stieringer
US561159A (en) * 1896-06-02 Island
DE718984C (en) * 1936-12-09 1942-03-26 Franz Wirschitz fitted with aluminum jaws branch terminal for electric aluminum wires
US2841774A (en) * 1955-09-16 1958-07-01 Edward W Romanek Electrical coupling

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US281576A (en) * 1883-07-17 Luther stieringer
US561159A (en) * 1896-06-02 Island
DE718984C (en) * 1936-12-09 1942-03-26 Franz Wirschitz fitted with aluminum jaws branch terminal for electric aluminum wires
US2841774A (en) * 1955-09-16 1958-07-01 Edward W Romanek Electrical coupling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Electrical World; Dec, 1965. *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923363A (en) * 1974-08-16 1975-12-02 Fargo Mfg Co Inc Hot line connector
US4327957A (en) * 1979-12-05 1982-05-04 International Telephone And Telegraph Corporation Electrical terminal lug
US4422712A (en) * 1980-10-28 1983-12-27 Siemens Aktiengesellschaft Housed contact arrangement for a tubular lamp
US4784621A (en) * 1987-09-14 1988-11-15 Auclair William T Wire connector
US4917615A (en) * 1988-11-18 1990-04-17 Franks George J Jr Ground bracket
US5201678A (en) * 1991-11-06 1993-04-13 Homac Mfg. Company Set screw bus connector
US6031446A (en) * 1999-03-09 2000-02-29 Eaton Corporation Combination fuse clip and line terminal connection device
US6877996B1 (en) 2002-11-27 2005-04-12 Senior Industries, Inc. Grounding connector
USD486791S1 (en) 2003-01-29 2004-02-17 Senior Industries, Inc. Ground block
USD487427S1 (en) 2003-01-29 2004-03-09 Senior Industries, Inc. Ground block
US20090160597A1 (en) * 2007-12-21 2009-06-25 Thomas & Betts International, Inc. High Voltage Fuse With Universal Fuse Terminal
US8169292B2 (en) * 2007-12-21 2012-05-01 Thomas & Betts International, Inc. High voltage fuse with universal fuse terminal

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