US1577489A - Electrode holder - Google Patents

Description

March 23,1926, 1,577,489

C. C. PECK ELECTRODE HOLDER Filed April 11, 1925 2 Sheets-$heet l INVENTOR.

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March 23 1926.

' c. c. PEpK ELECTRODE HOLDER Filed A ril 11, 1925 Patented Mar. 23, 1926.

'UNITVEDS'TATES PATENT OFFICE- PANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

ELECTRODE HOLDER.

Application filed April 11, 1925. Serial No. 22,443.

To all whom it may cancer h:

Be it known that I, CECIL C. PEoK, a c1t1.

-zen of the United States, and a resident of Cleveland, county'of Cuyahoga, andState of Ohio, have invented a new and useful Improvement in Electrode Holders, of which the following is a specification, the principle of the invention being .herein explained and the best mode in which Ihave contemplated applying that principle, so as to distinguish it from other inventions.

In the use of the electric are for metal working orfor analogous operations, wherein the electrode'is moved about by hand,

considerable difiiculty has been encountered in providing a satisfactory holder for such electrode, particularly where the latter is in. the form of a'carbon pencil. It-is neces- Y' the working end ofthe electrode.

1 sary, of course, thatlthe holding implement should permit the operator to grasp the same at a point not too far removed from A very high .degree of temperature,however, is developed at the point where the arc is thus struck and. ordinary heat insulating means are either to'be cumbersome or else inadequate for the proper protection of the user. Furthermore, the pencil, if exposed to the air, tends to oxidize and so waste away for a considerable distance back from the operating point.

One object of the present invention, ac-- cordingly, is to provide an improved form of electrode holder of portable type wherein means are incorporated for cooling both the implement and the portion of the pencil.

backof its operating point, so that the implement may be handled without discomfort and the body. of the pencil 'be prevented from reaching an oxidizing temperature.

A further object is to so construct the holder that the current passing therethrough to the electrode or pencil will be required totraverse the latter the shortest possible distance.

To the'accomplishment of the foregoing and related ends, the invention,- then, con- .sists of. the means hereinafter fully described and particularly pointed out in the claims, the-annexed drawin 4 and the following description setting orth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in whidch the principle of the invention may be use In said annexed drawing Fig. 1 is a side elevation of an electrode holder embodying my present improvements; Fig. 2 isa broken plan view thereof; Fig. 3 is a vertical transverse section taken on the plane indicated by the lines 33, Figs. 1 and 2; Fig. 4 is a, sectional view, similar to that of Fig. 3, but showing a modification in construction; Fig. 5 is a side elevation similar to Fig. 1, but showing still a further modification; and Figs. 6 and 7 V are transverse sectional-views of the latter taken on the planes indicated by the lines 66 and 77, respectively, Fi 5.

In the form of the device illustrate in Figs. 1 2 and 3, the main element is a longitudinally extending body member 1 formed of aluminum or other metal of high electrical conductivity, aluminum being preferred because of its relatively light weight.

CECIL C. PECK, OE CLEVELAND, OHIO, ASSIGNOR T0 'IHE LINCOLN ELECTRIC COM-.-

One end of said member 1 is provided with grasped by the hand of the operator. Such handle portion 4 furthermore desirably has wrapped about it one or more layers of asbestos rope 5 to insure thorough heat insulation.

The electrode holder 6 is of general cylin drical form, its upper end being provided with an offset ear 7 apertured to match the opening 3 in body member 1, so that said holder may be secured to the body member in desired angular relation by means of bolt- 8 and nut 9, as will be readily understood. Said holder 6 is pierced with a central aperture 10 that extends its entire length and is of uniform diameter save for the portion 10 immediately adjacent the outer or free end of the holder, which is smaller in diameter than the remaining longer portion of such aperture. The diameter of suchportion 10 in fact is such as to provide close fitting contact with the electrode 11, shown as consisting of a cylindrical carbon pencil, when such electrode is inserted' in theholder. In order to guide as well as properly support the pencil 11, a sleeve or bushing 12 of fiber, or equivalent velectrical insulating material, is fitted in the main portion of opening 10 to the bore of such sleeve, being of approximately the same diameter as the aperture portion 10. 7

As a result of the foregoing construction, it will be seen that the electric current entering the main body 1 of the device by way of connections 2 will flow into-the electrode proper only at the lower extremity of holder 6. Such current, in other words, has no occasion to traverse any considerable extent of the pencil within the holder and the consequent resistance heating effect is confined to such comparatively short length of the electrode. It will further be noted that the lower extremity 13 of the holder is beveled so that it is unnecessary for the electrode to project any great distance beyond such holder.

Surrounding the holder and in close fitting surface .contact therewith is a spiral tu-' bular coil 14, preferably of copper, the lower end 15 of such coil being bent upwardly alongsideand parallel with the axis of the coil and thence being'bent at approximately right angles and carried for a short distance arallel .with the upper end alongside the ody member 1 of the holder. The extremities of the respective tube ends are suitably connected with flexible tubular conduits 1 and 18 that extend thence through the hollow handle 4 to a point removedfromthe immediate field of use of the device where one such conduit, preferably conduit 17, .is connected with a pressure water supply and the otheris, allowed to discharge to waste. It will be understood, of course, that' any suitable cooling medium may becirculated through the conduits 17 .and 18 and the coil 14. As shown in Figs. 1, 2 and 3, the tube that comprises coil 14 is of slightly flattened section in order to increase the area of contact between same and the holder 6, the exterior surface of'th'e electrode being that of a plain cylinder.v In Fig. 4, on the contrary, the surface of the latter is formed with a spiral groove 19 in which the coil 20, here of circular section, lies.

Instead of employing a coil, a cooling chamber closely surrounding the holder may be otherwise provided as for example by means of a shelli20 (see Figs. 5, 6 and 7) that is spaced the proper distance from the electrode holder 21. In the modified construction in question, the holder differs in the first place from the one previously described in that it is rigidly instead of adjustably secured by means of an integral threaded sleeve 22 to the tubular handle member 23. In the second place, said holder is formed at its lower end with a flange 24 that is rabbeted to form a tight fitting joint 25 with the lower end of shell 20, a packing ring 26 being furthermore interposed to in-' sure against leakage. The upper end of the holder extends through the correspondin end of the shell and is externallythreade f to receive a nut 27 whereby the two parts in question may be secured together. In the third place, it will be noted thatthe insulat- "ing sleeve or bushing between the holder and electrode is omitted, the interior wall of the holder being simply spaced from the electrode 11 except at the lower end of the holder with which alone the electrode is in' contact.

The inner face of flange 24 is provided with an annular recess 30 that forms in effeet a continuation of the annular chamber between the holder 21 and shell 20. However, such recess is very nearly closed on from the remainder of such chamber by means of an inwardly directed flange 31 at the lower end of the shoulder, as clearly shown in Fig. 5. i

The cooling fluid is first led into such annular recess 30 by means of a duct 32 which extends-from flange 31 to a cored out pas sage 33 in the handle attaching sleeve 22. A flexible tubular conduit '34 is connected with such passage 33 through which a cool I ing fluid s supplied, and another similar conduit 35 is connected with a second passage 36 that opens directly into the upper end of the annular chamber between shell 20 and the electrode holder'21.

Fr'om thelforegoing construction, it will be evident-that the cooling fluid entering by way of conduit 34 will be initially supplied -tothe annular recess 3.0: at' the tip of the electrode holder from which it will escape to the constricted o ening .left between flange 31 and suchhol er. The fluid thence rises in the annular chamber and escapes by way of passage 36 and conduit 35. The conv striction provided by flange 31 insures that the recess 30 willjat all timesfcontain such cooling fluid and the latter is moreover caused tocirculate around the holder in order to escape rom such recess.

No further description of the manner of use of my improved electrode holder is" deemed necessary since the use of a device of this sort is 1n general well understood.

fortably warm; in fact, the usual protective mitten may be discarded, if desired. Furthermore, ue to the fact that the electrode holder is positively cooled to its very tip, and in particular in that portion through which electrical contact is had with the carbon pencil 11, the latter is prevented from becoming heated exce t at its exposed working extremity. The llfe of the pencil is correspondingly prolonged and the operation, whatever its character, in which the electric arc is being utilized, is materially facilitated.

In conclusion it should be noted that holder 6 in the case of the first described form of the device, as well as holder 21 in modified form, will require to be made not only of a metal that is a good conductor of electricit, but also one having a high thermal con uctivity. For practical reasons I prefer to use hard drawn copper, althou h aluminum may be used and silver would e stillbetter but is too costly.

. member,

'with a handle at one end; an electrode holder secured'to. the other end of said body saidholder being formed with an aperture adapted to receive an electrode pencil; a cooling chamber closely surrounding said holder; and connections for said chamber passing through said handle.

- her said holder being formed with an aper 2. In a device of the character described,

with a handle at one end; an electrode holder secured to the other end of said body memture adapted to. receive an electrode pencil and'having electrical contact at its outer endwonly'with, the latter; a-cooling chamber closely surroundin said holder; and'con nections for said 0 amber. passing through said handle; i V

3. In a device of the character described,

, the combination of a body member provided with a .handle at one end; an electrode holder secured to the other end of said body member, said holder beingformeo't with an aperture; 'adapted to receive .an electrode pencil and'having, electrical contact at its outer end only with the latter; and a cooling chamber closely surroundin said holder,

said chamber being arranged an constructedto conduct the cooling fluid initially to such contact end of said holder; and connections for said chamber passing through said handle. i I

4. In a device of the character described,

the combination of a body member provided with a handle at one end; an electrode holder angularly adjustably secured to the other en t. of said body member, formed with an aperture adapted to receive and hold an electrode pencil; a cooling chamber in the form of a coil closely surrounding said holder; and flexible connections for said coil carried by said body member.

5. In .a device of the character described, the combination. of a body member provided with a hollow handle at one end; an electrode holder angularly cured to the other end of said body member, saidholder being formed with an aperture adapted to receive and hold an electrode adj ustably sesaid holder being pencil; a cooling chamber in the form of a coil closely surrounding said holder; and

flexible connections for said coil (passing through the hollow handle of sai body member.

6. In a device of the character described, the combination of a body member provided with a handle at one end; an electrode holder angularly adjustably secured to the other end of said body member, said holder being formed with an aperture adapted toreceive and hold an electrode pencil; a bushing of electrical insulating material fitted in the aperture in said holder and preventing electrical contact between the latter and such pencil except adjacent the free end of with an aperture adapted to receive an elec-' trode pencil" and having electrical contact at its outer end only with the latter; a cool- 101 said holder; a cooling chamber in the form' i the combination of a body memberprovided body member, said holder being formed .ing chamber in the form of a coil closelyp surroundin for said coi said connections being arranged 'to conduct the cooling fluid initially to the said holder, and connectionsend of the coil adjacent such-contact end of 'said' holder.

8'. In .a device, of-the character described, the combination of an electrode holder formed with an aperture adapted to re ceivean electrode pencil and having electrical contact at its outer end only with the latter, and a cooling chamber closely surrounding said holder, said chamber being . an electrode pencil and arranged and constructed. to conduct the cooling fluid initially to such contact end of the holder.

9. In a device of the character described,

the combination of an electrode holder formed with an aperture adapted to receive aving electrical contact at its outer end on y with the latter, a cooling chamber, in the form of a coil nections for said coil, said connections being arranged to conduct the cooling fluid initially to the end of the coil adjacent such contact end of said holder.-

Signed by me, this 10th day of April, 1925. I

CECIL c. PECK.

closely surrounding said holder, and com 1

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