US2757348A - Roller contact device for electrical coils - Google Patents

Roller contact device for electrical coils Download PDF

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Publication number
US2757348A
US2757348A US474742A US47474254A US2757348A US 2757348 A US2757348 A US 2757348A US 474742 A US474742 A US 474742A US 47474254 A US47474254 A US 47474254A US 2757348 A US2757348 A US 2757348A
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United States
Prior art keywords
contact
contact device
coil
roller contact
electrical coils
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Expired - Lifetime
Application number
US474742A
Inventor
Gray John
Brawn James
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Brentford Transformers Ltd
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Brentford Transformers Ltd
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Publication date
Application filed by Brentford Transformers Ltd filed Critical Brentford Transformers Ltd
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Publication of US2757348A publication Critical patent/US2757348A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/005—Inductances without magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/06—Variable transformers or inductances not covered by group H01F21/00 with current collector gliding or rolling on or along winding

Definitions

  • This invention relates to contact devices adapted to be moved along a current-carrying coil which is bare at least over the part along which the contact is to be moved, the contact device being movable along a contact rod Which serves to guide the movement of the contact device and to conduct the current to a fixed terminal.
  • Such contact devices are employed in regulating transformers or similar apparatus employing a coil or Winding of which a variable part is to be connected into a circuit.
  • Such contact device includes means for resiliently pressing the contact element or elements against the bare coil or winding and the present invention has for its main object to provide an improved contact construction of the kind in which a pair of spaced rolling contact elements are employed and wherein the contact pressure of the two rolling elements is substantially equalized.
  • a further object of the present invention is to provide a mounting for such contact devices which will permit a .etter engagement of the rolling contact element With the coil in all positions of such contact element along the coil than has hitherto been possible.
  • Figure I shows a voltage regulator coil in plan with two pairs of roller contacts according to the present invention.
  • Figure 2 is an elevation of one pair of said roller contacts.
  • the voltage regulator coil is indicated at 1 and the contacts are mounted on a carriage comprising spaced plates 2, which is movable axially of the coil 1 by means of a shaft 3 driven through bevel gears 4 by a motor 5.
  • the shaft 3 is threaded to engage a nut member attached to the carriage 2.
  • Each contact device in the embodiment illustrated comprises two carbon rollers 6 which are rotatably mounted on pins 7 extending laterally from a block 8 which is provided with trunnions 9 (see Figure 2) extending at right angles to such pins.
  • Each trunnion 9 is rotatably mounted in a bearing element 10 and each bearing element 10 carries a plunger 11 passing through a guide bore in a lug 12 attached as by means of screws 16 to the respective plates 2, forming the carriage or to plates attached to such carriage.
  • a spring 14 is disposed around each of the plungers 11 between the respective bearing element 10 and the lug 12.
  • the ends of the trunnions 9 are electrically connected to the corresponding lugs 12 by strips of copper braid 15.
  • the plates 2 are formed with slots 17 in which the trunnions 9 are located so that as the plungers 11 slide relatively to the lugs 12, the trunnions 9 can move in the slots 17 (see the right hand side of Figure 1 where the bearing element is omitted and the contact elements 6 are indicated only by broken lines).
  • the contact rollers 6 are free not only to move radially of the coil 1 but also to turn about the axis of the trunnions 9 which is parallel to the axis of the coil 1 so that pressure of the two rollers against the coil is equalized.
  • An electrical contact device comprising a carrier; a pair of spaced guide members on such carrier; a guide bore in each said guide member, such guide bores being parallel; a plunger slidable in each said guide bore; a pivot bore in each such plunger, said pivot bores being disposed at right angles to said guide bores; a mounting block; two co-linear trunnions extending one from each side of such mounting block, said trunnions being rotatably disposed one in each said pivot bore; two co-linear mounting pins extending one from each side of the said mounting block, such mounting pins being disposed at right angles to said pivot bores and to said guide bores, a contact roller rotatably mounted on each such mounting pin; and resilient means urging said mounting block away from said guide members.

Description

July 31, 1956 J. GRAY ET AL 2,757,348
ROLLER CONTACT DEVICE FOR ELECTRICAL COILS Fil ed Dec. 13, 1954 John G samgs BRRWN \NVE N'ICHCS United States Patent Kidbroolke, London, Eng- Brentfortl Transformers Limited,
John Gray and James Brawn,
land, assignors to London, England Application December 13, 1954, Serial No. 474,742
Claims priority, application Great Britain December 22, 1953 1 Claim. or. 339-9 This invention relates to contact devices adapted to be moved along a current-carrying coil which is bare at least over the part along which the contact is to be moved, the contact device being movable along a contact rod Which serves to guide the movement of the contact device and to conduct the current to a fixed terminal. Such contact devices are employed in regulating transformers or similar apparatus employing a coil or Winding of which a variable part is to be connected into a circuit.
Such contact device includes means for resiliently pressing the contact element or elements against the bare coil or winding and the present invention has for its main object to provide an improved contact construction of the kind in which a pair of spaced rolling contact elements are employed and wherein the contact pressure of the two rolling elements is substantially equalized.
A further object of the present invention is to provide a mounting for such contact devices which will permit a .etter engagement of the rolling contact element With the coil in all positions of such contact element along the coil than has hitherto been possible.
The foregoing and further object of the present invention will be apparent from the following description of one embodiment of the invention which is illustrated in the appended diagrammatic drawings, in which:
Figure I shows a voltage regulator coil in plan with two pairs of roller contacts according to the present invention, and
Figure 2 is an elevation of one pair of said roller contacts.
Referring to the said drawings, the voltage regulator coil is indicated at 1 and the contacts are mounted on a carriage comprising spaced plates 2, which is movable axially of the coil 1 by means of a shaft 3 driven through bevel gears 4 by a motor 5. The shaft 3 is threaded to engage a nut member attached to the carriage 2.
Each contact device in the embodiment illustrated comprises two carbon rollers 6 which are rotatably mounted on pins 7 extending laterally from a block 8 which is provided with trunnions 9 (see Figure 2) extending at right angles to such pins.
Each trunnion 9 is rotatably mounted in a bearing element 10 and each bearing element 10 carries a plunger 11 passing through a guide bore in a lug 12 attached as by means of screws 16 to the respective plates 2, forming the carriage or to plates attached to such carriage.
A spring 14 is disposed around each of the plungers 11 between the respective bearing element 10 and the lug 12.
In order to ensure good electric connection, the ends of the trunnions 9 are electrically connected to the corresponding lugs 12 by strips of copper braid 15.
To permit movement of the contact rollers 6 radially of the coil 5 under the action of the springs 14, the plates 2 are formed with slots 17 in which the trunnions 9 are located so that as the plungers 11 slide relatively to the lugs 12, the trunnions 9 can move in the slots 17 (see the right hand side of Figure 1 where the bearing element is omitted and the contact elements 6 are indicated only by broken lines).
It will be seen that with constructions according to the invention, the contact rollers 6 are free not only to move radially of the coil 1 but also to turn about the axis of the trunnions 9 which is parallel to the axis of the coil 1 so that pressure of the two rollers against the coil is equalized.
We claim:
An electrical contact device comprising a carrier; a pair of spaced guide members on such carrier; a guide bore in each said guide member, such guide bores being parallel; a plunger slidable in each said guide bore; a pivot bore in each such plunger, said pivot bores being disposed at right angles to said guide bores; a mounting block; two co-linear trunnions extending one from each side of such mounting block, said trunnions being rotatably disposed one in each said pivot bore; two co-linear mounting pins extending one from each side of the said mounting block, such mounting pins being disposed at right angles to said pivot bores and to said guide bores, a contact roller rotatably mounted on each such mounting pin; and resilient means urging said mounting block away from said guide members.
References Cited in the file of this patent UNITED STATES PATENTS 2,242,453 Cochran May 20, 1941 FOREIGN PATENTS 478,664 Italy Feb. 28, 1953
US474742A 1953-12-22 1954-12-13 Roller contact device for electrical coils Expired - Lifetime US2757348A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35660/53A GB757237A (en) 1953-12-22 1953-12-22 Improvements in or relating to electrical contact devices movable axially along current-carrying coils

Publications (1)

Publication Number Publication Date
US2757348A true US2757348A (en) 1956-07-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
US474742A Expired - Lifetime US2757348A (en) 1953-12-22 1954-12-13 Roller contact device for electrical coils

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US (1) US2757348A (en)
ES (1) ES219143A1 (en)
GB (1) GB757237A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078430A (en) * 1960-04-27 1963-02-19 Charles P Majkrzak Sliding contact arrangement
US3166368A (en) * 1962-12-04 1965-01-19 Edward C Higgins Roller contact device for electrical coil
CN102693822A (en) * 2012-06-07 2012-09-26 百纳德（扬州）电能系统有限公司 Column type voltage regulator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1273675B (en) * 1962-12-01 1968-07-25 Midland Transformer Company Lt Current collectors for variable transformers, chokes and other coils and windings

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2242453A (en) * 1938-11-08 1941-05-20 Elwell Parker Electric Co Axle construction

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2242453A (en) * 1938-11-08 1941-05-20 Elwell Parker Electric Co Axle construction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078430A (en) * 1960-04-27 1963-02-19 Charles P Majkrzak Sliding contact arrangement
US3166368A (en) * 1962-12-04 1965-01-19 Edward C Higgins Roller contact device for electrical coil
CN102693822A (en) * 2012-06-07 2012-09-26 百纳德（扬州）电能系统有限公司 Column type voltage regulator

Also Published As

Publication number Publication date
GB757237A (en) 1956-09-19
ES219143A1 (en) 1955-12-16

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