US1863462A - Transformer for use in electric welding and like operations - Google Patents

Transformer for use in electric welding and like operations Download PDF

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Publication number
US1863462A
US1863462A US555128A US55512831A US1863462A US 1863462 A US1863462 A US 1863462A US 555128 A US555128 A US 555128A US 55512831 A US55512831 A US 55512831A US 1863462 A US1863462 A US 1863462A
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United States
Prior art keywords
transformer
coil
lid
casing
levers
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Expired - Lifetime
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US555128A
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English (en)
Inventor
Benedetto Giuseppe
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.)
OMES HOLDING Co Ltd
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OMES HOLDING Co Ltd
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Filing date
Publication date
Application filed by OMES HOLDING Co Ltd filed Critical OMES HOLDING Co Ltd
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Publication of US1863462A publication Critical patent/US1863462A/en
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    • 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
    • H01F29/08—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators
    • H01F29/12—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators having movable coil, winding, or part thereof; having movable shield

Definitions

  • This invention comprises improvements in or relating to transformers for use in electric welding and like operations. It is known in electric. arc welding of metals to employ a transformer with an automatically movable bobbin so that the linkage between the pnmary and secondary of the transformer can vary during the operation. 7 v
  • the present invention comprises in a transformer the combination of a magnetic core having a vertical limb, a primary coil and a secondary coil mounted thereon one of which coils is slid ably mounted to move upon the vertical limb of the core towards and away from the other, means for partially counterbalancing the weight of said movable coil and means for adjusting the extent to which said weightcls counterbalanced.
  • the invention further comprises the combination of a transformer as just described and electric arc welding apparatus connected thereto so as to be supplied with electric energy thereby.
  • Thectransformer thus constructed is peculiarly adapted for operation of arc welding apparatus owing to the long range of movement which can be allowed to the movable bobbin and because the working range of the movement, once current flows, may be readily adjusted to agree'with the average current which should be employed with a givenelectrode for the purpose of effecting the weld. That is to say, before an arc is struck the movable and fixed bobbins will be in close contact with one another, magnetic leakage will be at a minimum and the transformer secondary potential will be high. Consequently, the are is easily struck. Immediately current begins to flow the bobbin will move to a working position where it,
  • the apparatus floats, and if the counterbalancing of the movable bobbin is so adjusted that the working position is fairly near to the fixed bobbin the apparatus will have a suitable characteristic for working with a heavy current and a large electrode, while if the counterbalancing' force is adjusted to be more nearly equal to the weight of the movable bobbin the working position of the bobbin even with a light current will'be more remote from the fixed bobbin and the characteristics will be suitable for working with light currents and small electrodes.
  • the apparatus therefore, becomes readily adaptable to widely differing conditions of operation.
  • the weight of the movablebobbin of the transformer is counterbalanced by means of two counterbalance levers operatively connected together (for example by gear wheels) from one of which the movable bobbin is suspended, and upon the other of which a counterweightis secured.
  • gigure 2 is a sectional plan of the same, an i Figure 3 is a detail.
  • the transformer comprises an oil-tight casing 11 mounted upon trolley wheels 12 and provided with a removable lid 13 for access to the internal parts.
  • a transformer which comprises two upright laminated limbs 14, 15 of the magnetic circuit, united at the top and bottom by laminated cross members 16, 17 respectively.
  • a fixed secondary coil 18 Upon one of the limbs 15 there is mounted at the bottom a fixed secondary coil 18 and above ita movable primary coil 19.
  • the primary coil is suspended from two pivoted levers 20, 21 by means of flexible bands 22.
  • the ends of the levers to which the flexible bands 22 are attached carry arc-shaped guides 23 for the bands so that the movement of the primary coil 19 is in a verticalstraight line.
  • the construction of the primary coil 19 can side these there are four radial clamping 1 members 24 which extend in a diagonal direction from the four corners of the limb 15 of the magnetic circuit and are drawn by bolts 24, 27 they are notched to fitclosely against vertical angle plates 28 which are secured to the four corners of the vertical-limb 15 of the magnetic circuit.
  • These angle plates are made of non-magnetic material and the fit of the clamping plates 24, 27 upon them at the corners is such as to ensure easy sliding of the primary coi 1 up'and down the limb 15 of the magnetic circuit.
  • the outer bolts 26 of the primary coil 19 serve also to fasten to the coil yokes .29 carrying eyes 30 to which the suspension bands 22 are secured.
  • the bottom yoke 17 of the magnetic circuit is supported on each side by clamping plates 31, 32 (see Figure 2) which extend beyond the yoke and are anchored by angle plates 33, 34 to the bottom of the casing 11.
  • the upper yoke 16 is likewise provided with clamping plates 35, 36 which are extended somewhat beyond the yoke at each end.
  • one end the plates 35, 36 are bent at right angles to their general plane to provide a flange 37 to which is bolted a pivot block 38 for the lever 20 as hereinafter described.
  • the clamping plates 35, 36 are traversed by a long horizontal screwthreaded stem 39 which is secured to the clamping plates by nuts 40.
  • nuts 40 At the ends of the stem it carries nuts which secure to it. vertical rods 41.
  • a second screwthreaded stem 42 passes throu h the clamping plates and the yoke 16 just above the vertical limb 14 ofthe magnetic circuit and carries vertical rods 43.
  • the rods 42, 43 terminate at their upper ends in screwthreaded portions which pass through the lid 13 of the casing 11 and serve not only to provide an additional fixing means for the lid but also to ensure that the lid is properly spaced from the mechanism below it. The importance of this feature will be hereinafter pointed out.
  • the pivots of the levers 20, 21 are located upon a horizontal shaft 44 mounted in ball bearings carried by the pivot block 38.
  • a gear wheel 45 which meshes with a second gear wheel 46 upon a second transverse shaft 47. above the first. From this second transverse shaft there projects laterally a counterweight arm 48.
  • the counterweight arm 48 is located so that when viewed in plan it lies above the transformer and does not add to the floor space taken up by the apparatus.
  • the shaft 47 which carries the counterweight arm 48 is mounted in ball bearings 49 carried on the pivot block 38..
  • a counterweight 50 is longitudinally adis so located that its axis intersects the axis of the shaft 47 and the shaft is enlarged to form a banjo 56 at the place where the the arm.
  • the sprocket 51 at the pivoted end of the arm 48 sprocket is mounted.
  • the banjo 56 receives a large hollow sleeve 57 ( Figure 3) which forms an extension of the chain sprocket 51.
  • a cardan joint which enables the sprocket to be rotated by a vertical shaft 58 extending into the centre of the sleeve 57.
  • the cardan joint is constituted by a cross member 59 of the shaft 58 entering the vertical slots 60, 61 in the'walls of the hollow sleeve 57.
  • the shaft 58 extends vertically upwards and is provided with a telescopic section 62 and with a universal joint 63 at the top just below the lid 13 of the casing 11.
  • the upper end portion 64 of the shaft 58 passes through the lid 13, in which it is provided with a bearing, and outside the casing it carries a hand wheel 65 having -a pointer 66 which moves over a scale to show the setting of the counterweight 50.
  • the lid 13 is secured to the casing b a flanged joint around its periphery an is .furthermore located in relation to the transformer by means of the upwardly extendin bolts 41, 43 hereinbefore referred to secured to the magnetic frame of the transformer and extending upwardly through the lid of the casing.
  • Terminals 69, 70 for the connection of the electric supply and for the secondary of the transformer are mounted in the lid.
  • the whole of the internal apparatus is adapted to work immersed in oil which secures not only effective insulation of the parts but also automatic lubrication of the mechanism.
  • the transformer is preferably made with the primary and secondary of substantially similar form so that the ratio of the primary to the secondary voltage is 1: 1. Vhen the coils are close together the voltage is suitable for striking an arc with an arc-welding electrode. It will be understood that any desired ratio between the primary and secondary voltages can be arranged.
  • he apparatus described operates to regulate the voltage without the interposition of an ohmic resistance and therefore without the serious loss of energy which such a resistance involves. Furthermore, the characteristic of the current output can be regulated at will by adjustment of the handwheel, after which the operation is automatic.
  • the variation of the curre'ntduring operation is perfectly regular and does not present any steps as is the case when a rheostat is em- ⁇ ployed.
  • the transformer can be instantly adjusted to suit variations of work and the adjustment can be made even during the COUIiSe of operations while the machine is at wor r.
  • a magnetic core including a vertical limb, a primary coil and a secondary coil mounted upon said vertical limb, one of said coils being mounted to move upon the vertical limb towards and away from the other coil, two
  • counterbalance levers operatively connected together for movement in opposite directions and supported one above the other to extend over the plan area of the transformer, means suspending the movable coil from one of said levers, and a counterwei ht for the movable coil mounted upon the ot' er of said levers.
  • Apparatus as claimed in claim 1 wherein there is means for adjusting the counterwei ht on its lever. comprising sprockets on" sai lever 'and a chain passing over said sprockets and connected to said weight.
  • magnetic core including a vertical limb, a primary coil and a secondary coil mounted upon said vertical limb, one of said coils being mounted to move upon the vertical limb towards and away from the other coil, two counterbalance levers operatively connected together for movement in opposite directions and supported one above the other to extend over the plan area of the transformer, means suspending the movable coil from one of said levers, a counterweight for the movable coil mounted upon the other of said levers, a casing for said transformer, a cover for said casing, and means carried by said cover to adjust the position of said counterweight on its lever.
  • a magnetic core including a vertical limb, a primary coil and a secondary coil mounted upon said vertical limb, one of said coils being mounted to move upon the vertical limb towards and away from the other coil, two counterbalance levers operatively connected together. for movement in opposite directions and supported one above the other to extend over the plan area of the transformer, means suspending the movable coil from one of said levers, a counterweight for the movable coil mounted upon the other of said levers, a casing for said transformer, a cover for said casing, means to accurately space said cover from the core and levers, and means carried by said cover to adjust the position of said counterweight on its lever.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
US555128A 1930-05-28 1931-08-04 Transformer for use in electric welding and like operations Expired - Lifetime US1863462A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1863462X 1930-05-28

Publications (1)

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US1863462A true US1863462A (en) 1932-06-14

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US555128A Expired - Lifetime US1863462A (en) 1930-05-28 1931-08-04 Transformer for use in electric welding and like operations

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US (1) US1863462A (en(2012))
BE (1) BE380157A (en(2012))
FR (1) FR717877A (en(2012))

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT8122159U1 (it) * 1981-06-22 1982-12-22 Siev Spa Trasformatore a secondario mobile, particolarmente per l'uso in saldatura

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Publication number Publication date
BE380157A (en(2012))
FR717877A (fr) 1932-01-15

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