US2465880A - Portable spot welder - Google Patents

Description

` March 29, 1949. c5. .1. KAUDER 2,465,880

PORTABLE SPOT WELDER Filed Sept. 8, 1948 INVENToR. GEORGE J., KAUDER Affi/Wifi? Patented Mar. 29, 1949 UNITED STATES PATENT OFFICE 2,465,880 PORTABLE SPOT WELDER George J. Kauder, Brooklyn, N. Y. Application September 8, 1948, Serial No. 48,297

(Cl. 21S- 4) Claims.

This invention relates to new and useful improvements in a portable electric spot Welder, and more particularly, the present invention constitutes an improvement oi the spot welder disclosed in my co-pending application Serial No. 46,419 filed on August 27, 1943 under the title of Portable spot-Welder.

More particularly, the present invention proposes the construction of a portable electric spot welder characterized by a transiormer having a body mounted on the iront end thereof and supporting a fixed electrode and a movable electrode and integrally formed with a carrying handle and provided with a slidably mounted handle connected with the movable electrode arranged in a manner so that the electrodes may be moved together by simultaneously gripping the carrying handle and the slidably mounted handle and squeezing them together.

A further object of the present invention proposes constructing the iront body oi adjacent sections formed with aligned guideways for a nose piece which mounts the movable electrode and which is integrally formed with the slidably mounted handle in a manner so that the nose piece and slidably mounted handle may be engaged in position between the sections of the front body while assembling the same.

Still another object ol the present invention proposes mounting expansion springs between the adjacent faces of the handles in a manner to hold the handles in a separated condition in which the electrodes will be spaced from each other.

It is a further obje-ct of the present invention to construct an improved portable electric spot Welder which is simple and durable and which can be manufactured and sold at a reasonable cost.

For further comprehension of this invention, and of the objects and advantages thereof, reference will behad to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set orth.

In the accompanying drawing iorrning a material part of this disclosure:

Fig. l is a side elevational view ci the portable electric spot welder constructed in accordance with the present invention having portions ther-eci broken away to reveal interior construction.

`Eig. 2 is a iront elevational view of Fig. i, but with the iront ends oi the electrodes broken away.

Fig. 3 is a partial vertical sectional View taken on the line 3--3 of Fig. l. y

Fig. 4 is a partial vertical sectional View taken on the line 4-4 of Fig. 1.

Fig. 5 is a further partial vertical sectional view taken on the line ii-E of Fig. 1.

Fig. 6 is a perspective View of one cl the half sections per se oi the front body.

Fig. 7 is a perspective View of the nose piece per se, but with the major portion ol the slidably mounted handle broken away.

The portable electric spot Welder, according to the present invention, includes a transformer Ill made up of a plurality of laminations Il oi soit magnetic material forming the core of the transformer. Enclosed within the laminations IS there is a primary winding l2 made up oi a relatively large number of turns of wire. Also, enclosed within the laminations II there is a secondary winding I3 formed of a U-shaped piece of conductive material, and the secondary winding has its ends projected from the front end of the transformer IB. As is generally known in the art, the windings I2 and I3 are suitably insulated from each other and from the laminations iI which make up the core oi the transformer.

Mounted on the front end of the transformer lll, there is a front body lli and located at the rear end of the transformer I0 there is a frame l5. The transformer Il), the front body I4 and the frame I`5 are secured together by long bolts I6 which pass through the frame l5, the laminations II forming the transformer and which threadedly engage the front body I4. As clearly shown in Fig. 1, the heads of the bolts iii project beyond the back face ci the frame lll.

A hollow cap Il is positioned at the rear face oi the frame I5 and is provided at its corners with enlarged internal bosses EB which are formed at their front ends with holes I9 which enclose the heads of the bolts I6, see the lower right-hand corner oi Fig. 1. Diametrically opposite sides cf the frame I5 and the hollow cap Il are formed with aligned ears 2l] and bolts 'il are passed through the ears of the hollow cap I1 and threadedly engage the ears of the frame I5 securing the 5 hollow cap Il to the frame I5.

A manually closable switch 22 is mounted upon a rear portion of the front body I4 by several screws 23, only one of which is shown in l, and an electric wire 2t connects in series the switch Z2 and the primary winding lf2 of the ransiormer l@ and source ol electrical energy te energize the transformer when the switch 22 is manually closed. The end of the electric wire 24 extends from the hollow cap II at the back thereof and is provided with the usual plug 25 for insertion into the usual outlet re-ceptacle or other` source of electrical energy.

Further details of the foregoing parts, except for the iront body Ill and the parts carried thereby, will not be given in this specification as such parts are fully disclosed in my co-pending application referred to above.

The front body |15 is formed ci adjacent cast sections 23 substantially alike in formation and which abut each other along a vertical longitudinally extending contact line. The sections of the front body lll are secured together by bolts 2'| which freely pass through openings in one of the sections 26 and which threadedly engage complementary bosses E8 molded on the inside of the other section 25.

At the top, the front body i4 is formed with an inverted U-shaped carrying handle 29 formed of adjacent handle sections 3i! integrally cast with each of the sections 2S forming the iront body i4. When the sections 26 of the front body are clamped together, the adjacent faces of the handie sections Si abut one another, as shown in 2, B and 5, to form the complete carrying handle 2t.

At the bottom, the front body i4 is formed with a forwardly extending lip 3| formed with a semi-circular groove 32. A portion of the lip 3| .is formed with each section 26 of the front body i4 and each portion of the lip 3| is formed with a part of the semi-circular groove 32, see Fig. 6. The lip 9| mounts a iixed electrode 33 which has its front end 33a bent upwards as shown in Fig. l.. The rear end of the fixed electrode 33 is nested in the semi-circular groove 32 and a piece of insulation material 34 is interposed between the lip 3| and the rear end of the fixed electrode 33.

A metallic conductor strip 35 having a semicircular bottom face is engaged over the rear end of the fixed electrode 33 and has its rear end projected beyond the rear end of the electrode 33, as shown in Fig. l. The projected rear end of the conductor strip 35 is secured to one of the projected front ends of the secondary winding i3 of the transformer I6, by means of a bolt 36. rThus, the electrical circuit to the xed electrode 33 from the secondary Winding I3 is completed through the conductor strip 35.

Mounted in position over the top of the conductor strip 35 there is a piece of insulation material 31 which has its sides projected beyond the sides of the conductor strip 35, as shown in Fig. ll. Bo-lts 38 are passed upwards from the bottom face of the lip 3| through openings 3|av and pass through the sides of the insulation material 34 and threadedly engage the projected sides of the insulation material 31 securing those parts t0- gether with the rear end of the xed electrode securely clamped between the adjacent faces of the insulation material 34 and the semicircular bottom face of the conductor strip 35.

The adjacent faces of the sections 26 of the front body |4 are formed with guideways 39, see Fig. 6, beneath the front end of the carrying handle 29 and closely adjacent the top of the front body |4. When the sections 26 are clamped together, the guideways 39 become aligned and slidably support the rear end of a nose piece 40 for vertical sliding movements relative to the front body |4.

The front of the nose piece 46 is formed with a socket 4| in which there is mounted the rear end of a movable electrode 42. The movable electrode 42 has its front end 42a bent downwards towards the upwardly bent front end 33a of the xed electrode 33, see Fig. 1. The nose piece 40 is formed with slots 43 which extend radially from opposite sides of the socket 4|. Bolts 44 pass freely through openings 45, see Fig. 7, formed in the material of the nose piece 40 above the slots 43 and threadedly engage the material of the nose piece 40 below the slots 43 to be tightened to securely clamp the rear end of the movable electrode 42 in the socket 4| of the nose piece 4U.

An inverted U-shaped slidably mounted handle 46 is integrally formed with the nose piece 40. The handle 46 has its front vertical arm 46 integrally formed at its lower end with the nose piece 40 and slidably extended through a vertical passage 41 formed partially within each of the sections 30 of the carrying handle 29, see Figs. 2, 3, 5 and 6. The intermediate arm 4Gb of the slidably mounted handle 46 is horizontal and disposed above the carrying handle 29. The rear vertical arm 46c extends vertically downwards from the rear end of the intermediate arm '46'D and is slidably disposed in a vertical passage 48 formed partially within each of the handle sections 30 of the carrying handle 29.

Means is provided for holding the carrying handle 29 and the slidably mounted handle 46 in a spaced position in which the ends 33aL and 42a of the xed electrode 33 and the movable electrode 42 will be spaced, as shown in Fig. l. This resilient means comprises expansion springs 49 inserted between the adjacent faces of the carrying handle 29 and the slidably mounted handle 46. The expansion springs 49 are retained in position by having their top ends engaged with studs 50 integrally molded with the bottom face of the intermediate arm 4Gb of the slidably mounted handle and their bottom ends engaged with studs 5| integrally formed with the carrying handle 29. As shown in Figs. 5 and 6, the studs 5| are formed of adjacent semicircular stud sections integrally molded with each of the sections 26 of the front body I4.

Means is provided for connecting tha nose piece 46 to the other end of the secondary winding |3 to complete the electrical circuit from the secondary winding to the electrodes and the material to be welded between the ends 33EL and 42a of the electrodes 33 and 42. The connecting means comprises a flexible strip 52 of conductive material, see Fig. 1, having one end secured to the bottom face of the nose piece 40 by a bolt 53. The other end of the flexible strip 52 is secured to the other end of the secondary winding I3, by a bolt 54.

The switch 22 is illustrated as being mounted upon the front body I4 at a point remote from the carrying handle 29, so that one hand must be used for operating the switch while the other hand is used for squeezing the handles 29 and 46 together. This location of the switch 22 has been found to eliminate accidental closings of the switch; however, if desired, the switch could be located upon a portion of the carrying handle 29 or on the front body |4 more closely adiacent the carrying handle so that one of the ngers of the hand used for squeezing the handles 29 and 46 together may also be used to operate the switch 22. providing for one hand operation of the portable electric spot Welder.

While I have illustrated and described the preferred embodiments of my invention. it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention defined in the appended claims.

Having thus described my invention, claim as new, and desire States Letters Patent is:

1. In combination with a transformer having a primary winding and a secondary winding with ends projecting from the front end thereof, a front body mounted on the front end of the transformer, a fixed electrode mounted on said body and connected to one end of the secondary winding, said front body being formed with a guideway, a nose piece slidably mounted in said guideway and connected with the other end of the secondary winding, a movable electrode mounted in said nose piece to move towards and away from said fixed electrode as said nose piece is moved relative to said front body, a carrying handle integrally formed with said front body, and a slidable handle extending from said nose piece and slidably projected through and from said carrying handle to be gripped and squeezed with said carrying handle for moving said nose piece relative to said front body.

2. In combination with a transformer having a primary winding and a secondary winding with ends projecting from the front end thereof, a front body mounted on the front end of the transformer, a fixed electrode mounted on said body and connected to one end of the secondary winding, said front body being formed with a guideway, a nose piece slidably mounted in said guideway and connected with the other end of the secondary winding, a movable electrode mounted in said nose piece to move towards and away from said xed electrode as said nose piece is moved relative to said front body, a carrying handle integrally formed with said front body, and a slidable handle extending from said nose piece and slidably projected through and from said carrying handle to be gripped and squeezed with said carrying handle for moving said nose piece relative to said front body, said front body and carrying handle being formed of adjacent sections which abut each other along a vertical longitudinally extending contact line.

3. In combination with a transformer having a primary winding and a secondary winding with ends projecting from the front end thereof, a front body mounted on the front end of the transformer, a xed electrode mounted on said body and connected to one end of the secondary winding, said front body being formed with a guideway, a nose piece slidably mounted in said guideway and connected with the other end of the secondary winding, a movable electrode mounted in said nose piece to move towards and away from said fixed electrode as said nose piece is moved relative to said front body, a carrying handle integrally formed with said front body, and a slidable handle extending from said nose piece and slidably projected through and from said carrying handle to be gripped and squeezed with said carrying handle for moving said nose piece relative to said front body, said front body and carrying handle being 'formed of adjacent what I to secure by United sections which abut each other along a vertical longitudinally extending contact line, and means for releasably securing the sections of said front body together, said securing means comprising bolts passing through one of said front body sections and threadedly engaging complementary bosses formed on the other of said front body sections.

4. In combination with a transformer having a primary winding and a secondary winding with ends projecting from the front end thereof, a front body mounted on the front end of the transformer, a xed electrode mounted on said body and connected to one end of the secondary winding, said front body being formed with a guideway, a nose piece slidably mounted in said guideway and connected with the other end of the secondary winding, a movable electrode mounted in said nose piece to move towards and away from said nxed electrode as said nose piece is moved relative to said front body, a carrying handle integrally formed with said front body, and a slidable handle extending from said nose piece and slidably projected through and from said carrying handle to be gripped and squeezed with said carrying handle for moving said nose piece relative to said front body, said slidable handle having portions slidably extended through passages formed in said carrying handle.

5. A portable electric spot welder comprising a transformer having a primary winding and secondary winding with the ends of said secondary winding extending from the front end of said transformer, a front body formed of adjacent sections having aligned guideways, bolts passing through one of said sections and engaging complementary threaded bosses in the other of said sections securing said sections together', a fixed electrode mounted on and insulated from said front body and connected to one end of said secondary winding, a nose piece slidably mounted in said aligned guideways and connected with the other end of said secondary winding, a movable electrode mounted in said nose piece to move towards and away from said iixed electrode as said nose piece is moved relative to said front body, a carrying handle integrally formed with said front body, and a slidable handle extending from said nose piece and slidably projected through and from said carrying handle to be gripped and squeezed with said carrying handle for moving said nose piece relative to said front body.

GEORGE J. KAUDER.

RE "ERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,211,551 Winkler Aug. 13, 1940 2,256,028 Jardine et al Sept. 16, 1941 2,267,297 Campbell Dec. 23, 1941 2,402,004 Adams June 11, 1946 2,441,438 Mulder May 11, 1948

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