Патент USA US2129899код для вставки
Sept. 13, 1938. ‘I ‘J, YOUNG 2,129,899 ELECTRICALLY ACTUATED TOOL Filed June '7, 1935 24 -_-‘ ' Z6 . 6 t ' <3? :-_-_-_-_-_—_ ii: 7, L i ; i '1 27\ a M W “jg; l. 22 /9 r" 33 /0 23 5 J ij T f ""1 J l“; . ,,,,,, “w I 20 72 7/ IFEf; L L . H 29 34 v30 1%: 1014;‘; A5 /3 726 2/ 70 Jamil/500g ~ 2,129,899 Patented .Sept. 13, 1938 UNlTEDV STATES PATENT OFFICE Z,129,899 ELECTRICALLY ACTUATED TOOL John Young, Toledo, Ohio Application June 7, 1935, Serial No. 25,481 13 Claims. (01. 115-265) Figure 4 is a transverse sectionakview taken substantially on the line 4-4 of Figure 1; Figure 5 shows a form of frictional connection for readily attaching the engraving device to a current supply wire; Figure 6 is a general arrangement showing the method of using the engraving device of my invention utilizing an especially constructed This invention relates to electrically actuated tools and more particularly to a method and. means for performing work upon metals and alloys by the use of electric currents. The invention comprehends means using any suitable source of electric energy, either alternat ing or direct current, for marking metals and alloys or causing etching, engraving or other op eration thereon by utilizing a combined elec trical and mechanical means, the arrangement transformer in conjunction with a source of alternating current; cal circuit. _ , Figure 7 is a view showing a further method of in itself serving to rapidly interrupt the'electri utilizing the engraving device wherein direct 9 current isv used coupled with an adjustable re sistance bridge as a current controlling means; Figure 8 illustrates an arrangement wherein the casing of the tool may be fabricated of metal This invention has for one of its objects an improved marking or engraving device which has an electrode rapidly reciprocated by the electric current ?ow therethrough. Another object of the invention is to provide and insulatingly supported from surrounding a compact self-contained electro-magnet having ' structures. a marking or engraving element, the winding of the magnet serving as resilient or mechanical one of the sections of the core is readily adjust able for purposes of varying the intensity or While I have illustrated the arrangement of my invention as of a particular character and size for use in carrying out usual engraving op erations, it is to be understood that I contem plate the arrangement of my invention for various sizes of engraving devices usable for compara tively heavy work, as for example, in marking castings or in making comparatively deep serra tions in metals or alloys of all kinds. amplitude of the vibrating electrode carrying the engraving ‘element. designates a sleeve member fabricated of phenol means to reciprocate the engraving element when the current is interrupted. A further object of the invention is the pro vision of a device of this character which 0p erates on comparatively low voltages and wherein ‘ , Referring to the drawing in detail, numeral l0 condensation product‘ or other suitable insulat Still a further object is the provision of a ventilated housing for an engraving arrangement of this character whereby heat generated at the point of arc and the current ?ow is readily dis 30 ing material which forms a housing for the in terior mechanism as well as an adequate means of holding the engraving device during engraving sipated, and the invention further embraces a operations. Snugly ?tted within each end’ of the friction connecting means whereby the engrav sleeve ID are the bushings l2 and I3 which may ing device may be readily disconnected from the be of suitable material, as for example, bronze current supply and placed in a liquid ‘cooling or a bearing alloy. The bushing I3 is arranged to snugly receive a cylindrical member l5 having - medium. Further objects and advantages are within the a projecting reduced portion is centrally bored scope of this invention such as relate to the and threaded as illustrated in Figure 1. This threaded bore is adapted to receive a core mem arrangement, operation and function of the re lated elements of the structure, to various details ber of magnetizable material such as soft iron of construction and to combinations of parts, or the like having a smooth cylindrical portion l9 and a threaded portion 20 which is received in elements per se, and to economies of manufac ture and numerous other features as will be the bore of member IS, a transverse kerf 2i being 45 arranged in the outer end of core member l8 so apparent from a consideration of the speci?ca tion and drawing of-a form of the invention, as to accommodate a screw driver or tool for adjusting the core member with respect to cylin which may be preferred, in which: drical member IS. The sleeve or housing [0 is Figure 1 is a longitudinal sectional view show ing the arrangement of parts of the engraving ?xedly secured to member ii by means of a 50 rangement illustrated in Figure 1; bore in the member 15 vas particularly shown in screw 23- passing through ‘an opening in the device of my invention; Figure 2 is aside elevational view of the ar-, sleeve lllthrough bushing l3 and into a threaded ‘ Figure 8 is a transverse sectional view taken substantially on the line H of Figure 1; Figure 2. ' . - Slidably received in the bushing ii‘ in the op 2 2,129,899 posite end of the sleeve in is a plunger 24 of brass or suitable current; conducting material which is provided with a longitudinal central bore to receive an engraving element 26 or other tool actuated by reciprocatory action with respect to the work. I have found that there are numerous mate rials and alloys forming suitable engraving tools but that tungsten or an alloy of copper and tung 10 sten have been found to be entirely satisfactory. The engraving element or tool is held in place in plunger 24 by means of a set screw 21. The plunger 24 is preferably polygonal in cross section as indicated in Figure 3 and reciprocates in the 15 cylindrical interior of bushing I2. I have found that a non-circular con?guration for the plunger provides spaces between the plunger and the in terior walls of the bushing so as to decrease the friction between these parts and provide spaces for the passage of air or other medium for the purposes of cooling the electrode. The inner end of plunger 24 is provided with a portion 29 which may be a separate member or may be integral with the plunger 24. This member 29 is centrally bored to accommodate an other core member 39 of magnetizable material such as soft iron which forms another part or sec tion of the core structure. In the embodiment illustrated, the members l5 30 and 29 are joined together by means of a helix or spiral element 32 which is of a current con~ ducting material. The extremities of the helix are brazed or welded as at 33 and 34 to the mem bers l6 and 29 so as to virtually form an integral structure. I have shown the helical portion 32 as constructed of material of rectangular cross sec tion, but it is to be understood that any current conducting material of suitable cross section, as for example, a round section may be used without 40 departing from the scope of the invention. As will be hereinafter further explained, the core sections l6 and 36 are slightly separated to form a gap 22 as illustrated in Figure 1 and this gap may be varied by rotating core section II! through the use of a suitable tool insertedin the kerf ‘2|. The purpose of this separation is to permit a reciprocating movement of core section 36, member 29, plunger 24 and engraving tool 26 and to change the magnetic gap. The sleeve I I is perforated with openings ll so as to provide ventilating means to facilitate cooling of the ar rangement as the passage of current through the helix or coil 32 and the voltaic are occurring at the point of application of tool 26 to the work plate 66, the tool and its holder conducts heat generated by the arc into sleeve l9 and is dis sipated through openings ii in the sleeve. In the embodiment illustrated the lead wire to the engraving device is connected to a bushing ‘III by inserting the end of the lead wire in bore H thereof, the same being-held in place by means of a set screw ‘I2. The bushing 10 is pressed into a sleeve ‘I4 of Bakelite or other suitable insulat ing material. The other end of the bushing ‘I6 is slotted longitudinally and bored substantially the length of the slots as indicated at ‘I6 to ac commodate the projecting portion ii of member IS. The bore 16 is slightly smaller than the ex terior diameter of portion l6 so that the side 70 walls of the bushing adjacent the slotted portion are slightly expanded when the bushing is slipped over the projection ll .so that the parts will be held in close frictional contact to establish good 1b electrical contact therebetween. Figure 6 illustrates one arrangement in the utilization of the engraving tool. A source of al ternating current supply 40 supplies electrical energy which passes through the primary coil 4| of a transformer, the latter being provided with spaced taps 42 cooperating with a switch arm 43 for varying the effective number of turns in the primary of the transformer thus varying voltage obtainable from the secondary. The sec ondary of the transformer 44 is provided with taps 45, 46 and 41 providing the means for con necting the secondary of the transformer to the engraving tool and the element to be engraved respectively. In the arrangement illustrated tap 45 is connected by means of lead 46 to a clip 49 adapted to be secured to a plate 59 or other ele ment to be engraved, the tap 46 being connected by means of a lead 52 to the removable connec tion 10 of the engraving device. If the leadwire 52 is connected to the tap 41 a different voltage is supplied to the engraving 20 took-that is, the voltage across the complete sec ondary of the transformer. A further voltage variation may be attained by connecting lead 44 to the tap 46. In addition to these taps for at taining diiferences in voltage, a further voltage may be obtained by connecting the switch arm 43 selectively with one of the taps of the series of taps 42. In this manner a considerable adjust ment of voltage may be obtained for various classes of engraving. 30 In the operation of the arrangement of my in vention, the engraving tool is utilized in the same manner as when writing with a pencil, and as suming that current is supplied to the primary of the transformer and the element 26 of the en graving tool touches the plate 56, the circuit is completed and a current flows through the sec ondary of the transformer the coil 32 of the arrangement, thus in effect producing a solenoid, 35 magnetizing the iron core sections I 8 and 36 and due to the gap 22 and the resiliency of the coil 32 the engraving point 26 will immediately be re tracted from engagement with the work or plate 50. At the instant of this retraction, current ?ow between the engraving tool and the plate is broken causing a voltaic are leaving a serration in the work and the retractile stress in the coil 32 drives the engraving point or tool 26 again into the plate 56 at which time the circuit is again completed and current ?ows through coil 32 and the retracting action on tool 26 is repeated. At each expansive movement of coil 32, the engrav ing point 26 is driven into the plate 50 at which time the circuit is again completed and current flows through coil 32 and the retracting action _ on tool 26 is repeated. At each expansive move ment of coil 32, the engraving point 26 is driven into the plate aided by the inertia of the parts 24 and 29 as well as core section 36. This recipro catory action of the engraving point 26 is very rapid and I have found from experience as many as 180 impulses a second are imparted to the en graving point. Thus, through the medium of such a high periodicity of vibration and the in herent characteristics of the arc to displace or deform metal of the work adjacent the point of application of the tool the engraving or other useful work may be accomplished very rapidly—in fact, as fast as writing with an ordinary pencil, the engraving line or serration being practically continuous. _ - In the embodiment of the transformer illus trated in Figure 6, I have shown the lead wires 46 and 52 as connected across the taps 45 and 46 giving a- predetermined voltage which may be 75 3 , 2,129,899 varied by adjusting the switch arm 43 to a diner ent tap of the series of taps 42. In the event the magnetic “pul " upon 'core II and the en higher voltage is desired, the tap 41 may be con graying tool 26, thus permitting an extremely ?ne adjustment of the magnetic forces which nected to the lead 52 as illustrated in dotted . permits the utilization of comparatively low volt lines at 52', thus utilizing the entire secondary winding of the transformer. The voltage be tween taps 45 and 41 may further be varied by adjusting the switch 43 in the primary circuit as hereinabove described. . I have found that the depth of engraving and the hardness of the material operated upon neces sitates a variation in the voltage and current de livered through the coil 32 to the engraving tool. In this connection, I have found that for ordinary engraving uses, voltages from 3/; to 6 volts are age and current which reduces arcing and tend-4 ency to burn the work. In the arrangement shown in Figure 8, the casing III’ of the tool may be fabricated of metal or alloy and in order to direct .current ?ow through the coil 32' the bushing I?!" may be fab 10 ricated of insulating material, as for example, Bakelite, ?bre, or the like. By this arrangement, the current ?ow will be directed through the coil 32. It is apparent that, within the scope of the 15 satisfactory, although any desired voltage may invention, modi?cations and different arrange- . ments may be made other than is herein dis be obtained by using a vtransformer having dif closed, and the present disclosure is illustrative ' ferent ratios of windings as well as utilizing pri mary voltage of diiferent intensity. The use of merely, theinvention comprehending all varia 20 current of low voltage and comparatively low tions thereof. amperage in circuit with the engraving tool are found to be quite satisfactory in that the engrav ing is more or less accomplished by the impact of the tool 26 driven into the plate rather than through the excessive currentas has been utilized in prior engraving devices. Thus, I have ob tained satisfactory engraving without danger of burning the metal or work operated upon by uti lizing comparatively low voltage and current in the circuit of the engraving tool. Figure '1 illustrates an arrangement of utilizing the engraving tool of my invention with direct current, as for example, dry cell batteries or stor age accumulators. One side of the battery 60 is connected to the engraving tool, the other side being connected by means of a lead 62‘ to the ad justable arm 63 of a resistance bridge R, the extremities of the bridge being connected as at 64 and 65 to the plate 50" to be engraved. The solenoid arrangement in the engraving tool of - my invention operates equally well on direct cur ‘rent and the ‘voltage impressed upon the work plate 50" may be varied by adjusting the posi tion of the arm 63 to vary the effective resistance R, thus e?ecting a change in the voltage and the I have found that satisfactory engrav _ current. ing may be accomplished through the use of direct current as above described and as the current utilized is quite high, it has been found desirable in utilizing dry cells to connect a plurality of sets of dry cells in parallel so as to prolong the life of the current source without increasing the volt age. ‘ Under certain conditions of continued use, the device will become heated because of the heat discharged by reason of the current ?ow and are ing, and'in such event it is only necessary to withdraw the connector sleeve 10 from engage ment with the projection i6 and the device placed (30 in water ‘or other suitable cooling liquid. The liquid will circulate through the ventilating open ings ii and through the interstices between plunger 24 and sleeve I? so that the heat will be quickly dissipated. In a very short time the en graving device may be withdrawn from the cool ing medium and- the connection reestablished through sleeve 10. The cooling medium will drain out through the openings ii and the inter stices above mentioned so that it requires but a 70 ‘hort period of time in order to completely cool he- structure and resume engraving or other ' operations. 75 ‘ The adjustability of the gap 22 between the core sections i8 and 30 has been found tolbe quite desirable as in adjusting this gap there is What I claim is: - 1. In a device of the class described, including a casing; a current conducting coil within said casing including a plurality of spaced convolu tions forming a resilient structure one end of which is relatively fixed with respect to the casing‘; a relatively ?xed magnetizable member in said casing; a second magnetizable member positioned adjacent the free end of said resilient current conducting member; and a tool carried at the free end of the resilient structure. 2. In a device of the class described, including a casing; a current conducting coil within said casing including a plurality of spaced convolu-' tions forming a resilient structure; means to $3 ?xedly secure one end of said structure to said leasing; a plunger reciprocally mounted in said casing; a magnetizable member located within said convolutions and connected to said plunger; a portion of said plunger being ?xed to the free end of said resilient structure; the convolutions being arranged whereby when current flows therethroughthe magnetizable member is actu ated to compress the resilient structure and when the current is interrupted the resilient structure 45 returns the magnetizable member to its normal position. ' , 3. A device of the character disclosed includ ing a casing; a reciprocable element positioned within. the casing and having a projecting core of magnetizable material; a coil spring surround ing the projecting portion and connected to the reciprocable element, said spring adapted to con duct current to said reciprocable element and simultaneously magnetize said projecting core; 515 and a tool carried by said reciprocable element. 4. A device of the character disclosed, in com bination, a housing of insulating material; a re ciprocable element partially contained within said housing, said reciprocable element having a projecting section of magnetizable material; a sleeve ?xed within said housing and having a threaded bore; a second section of magnetizable material threaded into said sleeve; a current con ducting coil connecting said reciprocable element with said stationary sleeve, said second section of magnetizable material being adjustable ‘lon gitudinally to vary the gap between said sections of magnetizable material. 5. A device of ‘the character disclosed, in com bination, a cylindrical housing of insulating ma terial; a reciprocable element partially contained within said housing, said reciprocable element having a projecting section of magnetizable ma terial; a'second section of magnetizable mate- 1. 4 2,129,899 rial supported on said housing; a current con ducting coil connected to said reciprocable ele ment, said second section of magnetizable mate rial being adjustable to vary the gap between said sections of magnetizable material. 6. A device of the character disclosed, in com bination, a housing of insulating material hav ing ventilating perforations in the walls thereof; a reciprocable element extending into said hous ing, said reciprocable member having a portion 01' magnetizable material; a current conducting coil surrounding said portion of magnetizable material and connected to said reciprocable ele ment; said coil having spaced convolutions form 15 ing a resilient structure and a tool carried by said reciprocable member. 7. A device oi’ the character disclosecf'in com bination, a housing of insulating material; a reciprocable element partially contained within said housing, said reciprocable member having a projecting portion of magnetizable material; a sleeve positioned within said housing and hav ing a threaded bore; a shaft of magnetizable material threaded into said sleeve; a current conducting coil spring connecting said recipro cable element with said stationary sleeve, said shaft of magnetizable material being adjustable longitudinally to vary the gap between said shaft and the projecting portion of magnetizable ma terial carried by said reciprocable member; and means for connecting a current supply lead to the sleeve. 8. A device or the character disclosed, in com bination, a housing of insulating material having ventilating openings in the wall thereof; a re ciprocable element partially contained within said housing, said reciprocable member having a pro jecting portion of magnetizable material; a sleeve secured within said housing and having a thread 40 ed bore; a. shaft of magnetizable material thread ed into said sleeve; 9. current conducting coil spring connecting said reciprocable element with said sleeve, said shaft of magnetizable material being adjustable longitudinally to vary the gap between said shaft and the projecting portion of magnetizable material carried by said reciproca ble member; means for irictionally connecting a current supply lead to the stationary sleeve in cluding a split bushing; a sleeve of insulating ma 50 terial surrounding said bushing; and means for securing a current supply wire to said bushing. 9. A device oi the character disclosecLin com bination: a housing i'ormed of insulating mate— rial; a member secured to said housing having a 65 projecting portion: an iron core adjustably car ried by said member: a reciprocable element in said housing having a projecting iron core; a current conducting coil connecting said member and reciprocable element; means for connecting a lead wire to the projecting portion of said ?rst mentioned member including a slotted sleeve adapted to be frictionally retained on said pro jecting portion; and a sleeve of insulating mate' Cl rial secured to said slotted sleeve. 10. A device of the character disclosed, in com bination: a housing formed of insulating mate rial; a member ?xed in said housing and having a projecting portion; a reciprocable member in said housing having an iron core; a current con ducting coil connected to said reciprocable mem ber; means for connecting a lead wire to said ?xed member including a slotted sleeve adapted to be frictionally retained on said projecting por tion; and a sleeve of insulating material secured to said slotted sleeve. 11. A device of the character disclosed, in com bination, a housing of insulating material hav ing ventilating openings in the wall thereof; a 20 reciprocable element partially contained within said housing, said reciprocable element having a projecting portion of magnetizable material; a sleeve fixed within said housing and having a threaded bore; a shaft of magnetizable material threaded into said sleeve; a current conducting coil spring connecting said reciprocable element 1,1 with said relatively stationary sleeve, said shaft of magnetizable material being adjustable longi~ tudinally to vary the gap between said shaft and 30 the projecting portion of magnetizable material carried by said‘reclprocable member; means for connecting a current supply lead to the stationary sleeve including a split bushing; a member 01' insulating material surrounding said bushing; and means for securing a current supply wire to said bushing. ' i 12. In a device of the class described including a casing; a current conducting coil within said casing including a plurality of spaced convolu 40 tions forming a resilient structure; a plurality of magnetizable members within said casing, one of said members being relatively ?xed with re spect to said casing, the other of said members being relatively movable therein; and a tool con» ~15 nected to the relatively movable member. 13. A device of the character disclosed includ ing a casing; a reciprocable magnetizable mem ber positioned within the casing; a second mag netizable member spaced from said reciprocable magnetizable member; a current conducting helix within said casing connected to said reciprocable member, said current conducting helix when en ergized adapted to magnetize said magnetizable ' members to cause reciprocation of said reciproca ble member. JOHN YOUNG.