US2921146A - Plug-in type power take-off device with bimetallic contacts - Google Patents

Plug-in type power take-off device with bimetallic contacts Download PDF

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Publication number
US2921146A
US2921146A US700038A US70003857A US2921146A US 2921146 A US2921146 A US 2921146A US 700038 A US700038 A US 700038A US 70003857 A US70003857 A US 70003857A US 2921146 A US2921146 A US 2921146A
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US
United States
Prior art keywords
contact
bimetallic
power take
contacts
bimetallic strip
Prior art date
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
Application number
US700038A
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English (en)
Inventor
Eric A Ericson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to CA609752A priority Critical patent/CA609752A/en
Application filed by General Electric Co filed Critical General Electric Co
Priority to US700038A priority patent/US2921146A/en
Priority to JP6340658U priority patent/JPS3528820Y1/ja
Application granted granted Critical
Publication of US2921146A publication Critical patent/US2921146A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/504—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by thermal means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R41/00—Non-rotary current collectors for maintaining contact between moving and stationary parts of an electric circuit

Definitions

  • My invention relates to electric power take-off devices and more particularly to electric power take-off devices of the plug-in type such as are adapted to be used with bus bar type distribution systems or busways, and including stationary take-off devices and movable or trolley type take-off devices.
  • an object of this invention to provide an improved power take-01f device which provides high contact pressure when needed without causing difficulty in inserting or removing such device. It is another object of the invention to provide an improved trolley type take-off device in which high contact pressure is provided only when needed, thus reducing friction and wear during ordinary movement of the device.
  • an electric power take-off device including a main supporting body and a contact movable relative thereto for engagement with a busway conductor.
  • a current responsive member is provided on the main support, connected electrically in series with the contact and adapted to exert supplementary force on the contact in a contact making direction in response to current flow therethrough. Since the magnitude of such force depends upon current flow, it is reduced in the absence of such current. This permits ready insertion or removal of the device on a busway.
  • the invention is especially adapted for trolley type power take-off devices, where it minimizes friction and wear of contacts by providing high contact pressure only at times when it is needed. While this is of value in any application "of a trolley type device, it is especially useful in those frequent applications where power is drawn only when the device is stationary.
  • Figure 1 is a perspective View of an electric power take-off device of the trolley type incorporating the invention
  • Figure 2 is a perspective view of the contact supporting structure of the collector of Figure 1, with a portion of the insulating body thereof and one contact assembly removed;
  • Figured is a plan view of a portion of the collector of Figure 1 shown in operative relation with associated ice bus bars of a busway system, a portion of the insulating body being omitted to show the contact arrangement;
  • Figure 4 is an exploded perspective view of a contact assembly of the collector of Figure 3;
  • Figure 5 is a plan view in section of a stationary power tape-ofi device embodying the invention.
  • Figure 6 is an exploded perspective view of the contact assembly of the collector of Figure 5;
  • Figure 7 is an elevation view, partly in section, of the trolley type power collector of Figure 1 in place on a power distribution duct or busway;
  • Figure 8 is a View similar to Figure 7, but showing the stationary power take-off device of Figure 5 in place on a power distribution duct or busway.
  • a power distribution duct or busway power take-off device of the trolley type incorporating the invention comprising a carriage or main support 1, adapted to be supported in rolling engagement with rail surfaces R of a distribution duct D ( Figure 7) by means of wheels 2 afiixed to axles 3, wheels 5 are also provided which are adapted to engage the under side of the duct D to restrict tipping.
  • An insulating carrier or casing, generally designated at 6, is afixed by suitable means such as by screws 4 to the support 1, and carries a pair of contact assemblies including contacts 7 adapted to slidably engage bus bars 28.
  • Casing 6 includes two halves 9, 10 enclosing the contact assemblies 8. The two halves 9, 19 are joined by suitable fasteners such as by screws or rivets 11.
  • An insulating cover member 12 is secured to the casing by suitable fasteners such as by screws or rivets 12a.
  • the casing 6 includes a depending portion 6a adapted to house conductors 13 which lead to a power consuming device (not shown).
  • the halves 9, 1G or" the casing 6 are each formed with a recess 14 partially enclosed by a wall 15 terminating in a generally cylindrical enlargement 16 leaving a restricted passageway between the enlargement 16 and the wall 14 of the casing 6.
  • a recess 17 is also provided in the meeting face of each casing half and arranged to communicate with the recess 14 of the opposite casing half when the casing 6 is assembled.
  • Each contact assembly includes a thermally responsive bimetallic member or strip 18, bent into a generally U- shaped form, with an arcuate bight portion 18a and opposed leg portions 18b, 180.
  • the bimetallic strip 18 is arranged so that the side thereof having the greater coefficient of thermal expansion is inside the U, so that the U will expand and the free ends move away from each other upon increase in the temperature of the bimetallic strip, as shown by the double arrow in Figure 4.
  • An offset or shoulder 19 is formed in leg 18b of the bimetallic strip 18, for cooperation with a compression spring member 20 which abuts leg 18b of the bimetallic strip when assembled in the contact structure. Shoulder 19 serves to prevent outward sliding of spring member 20 on the leg 18b toward the end thereof.
  • a contact 7 is conductively affixed to leg of bimetallic strip 18 by suitable means such as by Welding.
  • a flexible pigtail lead 21 is soldered or otherwise conductively affixed to bimetallic strip 18 at 22, and to a terminal 24, carried by the casing 6, at 23.
  • Terminal 24 is provided with a threaded opening 25 receiving a terminal screw 26 to secure one of the conductors 13 thereto.
  • the contact assembly 8 is assembled in casing 6 by placing spring 20 loosely in recess 17, and disposing the arcuate portion 18a of bimetallic strip 18 about cylindrical enlargement 16, with leg 18c lying outside and. parallel to the casing and the leg 18b lying within recess 14. Bimetallic strip 18 is thus pivotally supported in the casing 6 by sliding engagement with cylindrical enlargement .16 and Wall 14'.
  • the free end of spring member 20 is disposed to abut leg 18b of bimetallic strip 18 adjacent shoulder 19.
  • a recess 27 is also provided in each of the casing halves9. and to. receive flexible pigtail lead 21.
  • Compression spring members 20 are'provided, positioned in each recess 17, which bias bimetallic strips-18 and contacts 7 respectively :outwardly. into engagement with electric'currentsupply conductors or bus barsl28, about circular enlargements 16 as pivots.
  • Thebimetallic'strips l8 are/connected electrically in series with the contacts 7, a'circuitrbeing established from bus bars 28, to contacts 7, to bimetallic strips 18, to.:pigtailsleads 21, terminalstrips 24, and conductors 13.
  • FIG. 5 there is shown a-stationary't-ype power takeoff device embodying-the invention.
  • This embodiment comprises a contact structure generally indicated at 29 in Figure 6.
  • a bimetallic strip ormember 30 of L-shaped'form is provided, in'which'the metal strip having the greater co-eflicient of thermal expansion is placed on the outside of the L, so that distortion caused by thermal expansion will cause movement ofthe free end in the direction of the arrow in FigureS.
  • nLeg 31 is provided with a threaded hole 32 cooperating with a screw 33 for connection to incoming leads 13-.
  • --An-opening 34 is formed in the bimetallic strip for attaching the strip 30 to a wall of the casing 6' in recess 43 by suitable means such as a screw or rivet (not shown).
  • a contact 35 is secured to a contact bearing bracket 36, which is provided with flanges 37 and inwardly bent tongues 38.
  • a compression spring member-39 is interposed between contact carrying element 36 andthe-free end 40 of bimetallic strip 30 as best seenin Figure- 6,
  • a flexible pigtail lead 41 is soldered or otherwise conductively-aifixed to-' free end 40' of bimetallic strip 30 and to element 36.
  • the current collector may be "moved along the rails or duct on rollers 2 without incurring substantial frictional wear' of contacts 35 upon bus bars""45. When current is drawn, however, the strip deflects and increases the contact pressure.
  • said support means connecting saidcontact and said bimetallic strip electrically in series, and means connecting said second portion of; said bimetallic strip to said contactdn force-- transmitting-"relation, said bimetallic strip .being. constructed'to deflect when heated by current passing therethrough in a direction to exert a force on said .contact through said force-transmitting means.
  • a trolley type powerMtake-ofi device comprising a support, means for mountingflsaid support to :provide relative movement between: said .support and the housing when the support .is used incombination therewith, at least one elongated generally ushapedybimetallic strip .member pivotally mounted. ,on said, support adjacent thebight of said U, an electrical :contact; mounted-on. one-end of saidxbimetallicstrip member and :adapted'to be moved thereby outwardly.

Landscapes

  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
US700038A 1957-12-02 1957-12-02 Plug-in type power take-off device with bimetallic contacts Expired - Lifetime US2921146A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA609752A CA609752A (en) 1957-12-02 Electric power take-off device
US700038A US2921146A (en) 1957-12-02 1957-12-02 Plug-in type power take-off device with bimetallic contacts
JP6340658U JPS3528820Y1 (enExample) 1957-12-02 1958-12-02

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA609752T
US700038A US2921146A (en) 1957-12-02 1957-12-02 Plug-in type power take-off device with bimetallic contacts
JP6340658U JPS3528820Y1 (enExample) 1957-12-02 1958-12-02

Publications (1)

Publication Number Publication Date
US2921146A true US2921146A (en) 1960-01-12

Family

ID=72601274

Family Applications (1)

Application Number Title Priority Date Filing Date
US700038A Expired - Lifetime US2921146A (en) 1957-12-02 1957-12-02 Plug-in type power take-off device with bimetallic contacts

Country Status (3)

Country Link
US (1) US2921146A (enExample)
JP (1) JPS3528820Y1 (enExample)
CA (1) CA609752A (enExample)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014100A (en) * 1960-03-08 1961-12-19 Henry S Zablocki Wiper assembly
US3392244A (en) * 1965-07-26 1968-07-09 Vahle Paul Kg Safety trolley duct and carriage for same
JPS4970425U (enExample) * 1972-10-02 1974-06-19
US3880264A (en) * 1971-03-05 1975-04-29 Alden Self Transit Syst Power system
US3890027A (en) * 1973-11-01 1975-06-17 Gen Electric Electrical socket
US4236616A (en) * 1978-07-20 1980-12-02 Paul Vahle Kg Current collector shoe
US5138953A (en) * 1991-01-09 1992-08-18 Horcher Gmbh & Co. Kg Transportation device with a load carrier suspended movably from a rail for a suspended load
US5503259A (en) * 1995-08-22 1996-04-02 Tekno, Inc. Electrification module for conveyor
US6241065B1 (en) * 1998-03-20 2001-06-05 Mannesmann Ag Current collector trolley for current collector lines
AU2009215363B2 (en) * 2008-02-18 2014-03-06 Arjohuntleigh Magog Inc. Conductive connection for track-riding patient hoists
US8978905B2 (en) 2010-07-02 2015-03-17 Liko Research & Development Ab Lift systems with continuous in-rail charging
EP2799277A3 (de) * 2013-05-03 2015-11-11 Heinrich GmbH Stromlaufschiene und Stromlaufschienensystem
US20160201380A1 (en) * 2013-08-19 2016-07-14 Kl Megla Gmbh Door Having Electrical Contacting
EP3369659A1 (en) * 2017-03-02 2018-09-05 Bell Helicopter Textron Inc. Bogie mechanism for a tiltrotor proprotor door
US10533603B2 (en) 2017-03-02 2020-01-14 Bell Helicopter Textron Inc. Roller track assembly for a tiltrotor proprotor door
US10875627B2 (en) 2018-05-01 2020-12-29 Bell Helicopter Textron Inc. Movable cover for a proprotor nacelle
US10994853B2 (en) 2017-03-02 2021-05-04 Bell Helicopter Textron Inc. Tiltrotor aircraft rotating proprotor assembly
US11046446B2 (en) 2017-03-02 2021-06-29 Bell Helicopter Textron Inc. Tiltrotor aircraft rotating proprotor assembly
WO2023104549A1 (en) * 2021-12-06 2023-06-15 Arjo IP Holding Aktiebolag Patient hoist

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5818841B2 (ja) * 1975-01-29 1983-04-15 横浜ゴム株式会社 集電可能なゼロプレツシヤ−タイヤ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1943958A (en) * 1933-06-07 1934-01-16 Kerant Corp Electric plug construction
US2077587A (en) * 1936-01-13 1937-04-20 Trumbull Electric Mfg Co Electric switch
US2128135A (en) * 1936-02-24 1938-08-23 Feedrail Corp Electric trolley construction
US2170298A (en) * 1936-11-16 1939-08-22 William H Frank Electrical distribution system
US2361536A (en) * 1943-07-21 1944-10-31 Bulldog Electric Prod Co Collector
US2537866A (en) * 1946-11-08 1951-01-09 Feedrail Corp Removable trolley for overhead ducts
US2740942A (en) * 1953-06-05 1956-04-03 Breeze Corp Bi-metal contact springs

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1943958A (en) * 1933-06-07 1934-01-16 Kerant Corp Electric plug construction
US2077587A (en) * 1936-01-13 1937-04-20 Trumbull Electric Mfg Co Electric switch
US2128135A (en) * 1936-02-24 1938-08-23 Feedrail Corp Electric trolley construction
US2170298A (en) * 1936-11-16 1939-08-22 William H Frank Electrical distribution system
US2361536A (en) * 1943-07-21 1944-10-31 Bulldog Electric Prod Co Collector
US2537866A (en) * 1946-11-08 1951-01-09 Feedrail Corp Removable trolley for overhead ducts
US2740942A (en) * 1953-06-05 1956-04-03 Breeze Corp Bi-metal contact springs

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014100A (en) * 1960-03-08 1961-12-19 Henry S Zablocki Wiper assembly
US3392244A (en) * 1965-07-26 1968-07-09 Vahle Paul Kg Safety trolley duct and carriage for same
US3880264A (en) * 1971-03-05 1975-04-29 Alden Self Transit Syst Power system
JPS4970425U (enExample) * 1972-10-02 1974-06-19
US3890027A (en) * 1973-11-01 1975-06-17 Gen Electric Electrical socket
US4236616A (en) * 1978-07-20 1980-12-02 Paul Vahle Kg Current collector shoe
US5138953A (en) * 1991-01-09 1992-08-18 Horcher Gmbh & Co. Kg Transportation device with a load carrier suspended movably from a rail for a suspended load
US5503259A (en) * 1995-08-22 1996-04-02 Tekno, Inc. Electrification module for conveyor
US6241065B1 (en) * 1998-03-20 2001-06-05 Mannesmann Ag Current collector trolley for current collector lines
AU2009215363B2 (en) * 2008-02-18 2014-03-06 Arjohuntleigh Magog Inc. Conductive connection for track-riding patient hoists
US8978905B2 (en) 2010-07-02 2015-03-17 Liko Research & Development Ab Lift systems with continuous in-rail charging
US9796168B2 (en) 2010-07-02 2017-10-24 Liko Research & Development Ab Lift systems with continuous in-rail charging
EP2799277A3 (de) * 2013-05-03 2015-11-11 Heinrich GmbH Stromlaufschiene und Stromlaufschienensystem
US20160201380A1 (en) * 2013-08-19 2016-07-14 Kl Megla Gmbh Door Having Electrical Contacting
EP3369659A1 (en) * 2017-03-02 2018-09-05 Bell Helicopter Textron Inc. Bogie mechanism for a tiltrotor proprotor door
US10533603B2 (en) 2017-03-02 2020-01-14 Bell Helicopter Textron Inc. Roller track assembly for a tiltrotor proprotor door
US10539180B2 (en) 2017-03-02 2020-01-21 Bell Helicopter Textron Inc. Bogie mechanism for a tiltrotor proprotor door
US10994853B2 (en) 2017-03-02 2021-05-04 Bell Helicopter Textron Inc. Tiltrotor aircraft rotating proprotor assembly
US11046446B2 (en) 2017-03-02 2021-06-29 Bell Helicopter Textron Inc. Tiltrotor aircraft rotating proprotor assembly
US11492131B2 (en) 2017-03-02 2022-11-08 Textron Innovations Inc. Tiltrotor aircraft rotating proprotor assembly
US10875627B2 (en) 2018-05-01 2020-12-29 Bell Helicopter Textron Inc. Movable cover for a proprotor nacelle
US11628923B2 (en) 2018-05-01 2023-04-18 Textron Innovations Inc. Movable cover for a proprotor nacelle
WO2023104549A1 (en) * 2021-12-06 2023-06-15 Arjo IP Holding Aktiebolag Patient hoist

Also Published As

Publication number Publication date
JPS3528820Y1 (enExample) 1960-10-31
CA609752A (en) 1960-11-29

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