US1929295A - Arc lamp - Google Patents

Description

Oct. 3, 1933. J. H. WAGENHORST ARC LAMP 4 Sheets-Sheet l Filed Oct. 15. 1928 M ATTORNEY? Oct. 3, 1933.

J. H. WAGENHORST 1,929,295

ARC LAMP Filed 00 13, 1928 4 sheets-sheet 2 ZQV ATTORNEYS 4 Sheets-Sheet I I l 2733 J. H. WAGENHORST ARC LAMP Filed Oct. 13, 1928 Oct. 3, 1933.

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F ,W HI W%W Oct. 3, 1933. J. H. WAGENHORST ARC LAMP Filed Oct. 13, 1928 4 Sheets-Sheet 4 v ilr fig; ATTORNEYS.

Patented Oct. 3, 1933 PATENT. o-FFI-ca I I ARC LAMP I James H'. Wagcnhorst, Jackson, Mich.

Application October s, 1928. Serial No. 312,326

14 Claims. (01; 176-58) -My. invention relates to improvements in arc lamps and has to do, more particularly, with certain improvements in the design and construction of such lamps, which adapt them for use in giving therapeutic treatments in the home. "The 1 present invention comprises certainimprovements over the arc lamps shownand'claimed in my Patents, Number 1,817,955, filed Marchd, 1926, and Number 1,884,417, flledJanJ 31, 1928.

The principal object of my invention is to pro- ,vide an arc lamp of such construction asto be 1 very simple and efficient and which will operate smoothly and effectively. Another object of my invention is to provide an arc lamp construction in which all chattering due to the use of alternating current is eliminated. A further object of my invention is to provide improved and simple means for retarding the movement of the electrodes, in the direction to'draw the arc, while leaving the electrodes free to move toward each other when the arc has been extinguished. 'Another object of my invention is to provide an improved means by which the electrodes can be straightened and alined, after they have been clamped in the electrode holders. A further object of my invention is to provide an arc lamp construction which will have a greater effective light output due to the f act that the crater of the arc is exposed so' that both the flame and the spot of the are are effective. A further object of my invention is to provide an improved cabinet construction and, further, a cabinet provided with means for preventing sparks from falling from the cabinetto the floor of the room in which the lamp is used. I I

- Further objects, and objects relating to details and economies of construction and operation will definitely appear from the detailed description to follow. In one instance, I accomplish the objects of myv invention by the devices and means set forth in the following specification. My invention is clearly out in the appended claims. A structure constituting a preferred embodiment of my invention is illustrated in the accompanying drawings, forming a part of this specification, in which Figure 1 is:a perspective view of an arc lamp embodying my invention;

Fig- 2 is a view of the lamp and operating mechanism in front elevation, a portion of the ing shown in section;

Fig. 3 is" a detail, sectional view, taken on the .line Ii-3 of Fig. 2;

defined and pointed Fig. 4 is a detail, sectional view taken on the line44of Fig.2;

Fig. 5 is a top plan view of the lamp, with the housing surrounding the operating 'mechanism shown in section;

Fig. 6 is a detail, sectional view through the holder for the upper electrodes, taken on the line 6-6 of Fig. 2; i

Fig. '7' is a detail, sectional 'view showing the connections between the upper end of the clutchoperat-ing rod and the clutch-operating lever takenon the line 7-7 of Fig. 2;

Fig. 8 is a detail, sectional view showing the mounting for the-lower electrodes, taken on the line 8-8 of Fig. 2;

Fig. 9 is a wiring diagram showing the electrical connections for the lamp;

Fig. 10 isa detail, sectional view showing the means for holding the adjustable reflector or front wall of th'e'cabinet in adjusted position, and

Fig. 11 Ba detailed perspective view showin the clutch. I

In the drawings, the same reference nimerals refer to the same parts throughout the several views andthe sectional views are taken looking in the direction of the arrows at the ends of the section lines.

One of the objects of my invention is to eliminate the chattering of the electrodes due to the use of alternating current and I accomplish this objectby providing a resilient support for the solenoid, the solenoid being supported by spring arms carried by'the frame. I have provided a brake for "retarding the movement of the operating mechanism which draws the arc, so as to slow up this movement. I have found that this brake is simpler than a dash-pot and that it has the advantage that it retards movement only in" the one direction. I have provided a saddle swiveled on one of the electrode holders and have found that this permits the carbons or electrodes to be straightened and lined up after they have been clamped in theholders. My invention comprises also the mounting of the electrodes in the frame, and the suspension of the frame, in such a way that the electrodes are inclined slightly from the vertical and lean backward. 'I have found that this exposesthe crater of the arc, so that both the flame and the spot of the are are effective to give light. I have also provided an improved and simple cabinet construction as will be seen hereinafter. I

Referring to'the particular embodiment of my invention illustrated in the accompanying drawin the guide brackets33.

of which are suspended and supported from a frame 10, which is formed from a. bar or strip bent into rectangular form and provided with two parallel tail members 11 extending from the central portion of the base of the rectangular frame. These tail members 11 serve to support the lower or stationary electrodes of the arc lamp. A block 12, of insulating material, is fastened to these tail members 11 by bolts 13, and an electrode supporting bar 14 is fastened to the block 11 by the bolts 15. The bar 14 extends transversely of the lower portion of the lamp within the cabinet and has, at opposite ends, a pair of grooves 16, which are adapted to receive the electrodes 17. The electrodes are clamped in position on this bar by the clamping plates 18 and the bolts 19, as shown more particularly in Fig. 8. In this way, the lower or stationary electrodes are so mounted that four of them can be clamped substantially parallel to each other. Referring toFig. 8, it will beseen that the radius of each groove 16 is considerably less than the radius .of the carbon 17. Byv using grooves of this formation, I can clamp carbons of varying diameter in the same holders. This is of advantage because differences in current used sometimes require a slight variation in the size of the carbons employed. 7

To each side member of the frame 10, there are fastened slabs 20 of insulating material and, at the bottom, near the lower ends of these slabs, the angle brackets 21 are fastened. These brackets have horizontal legs provided with openings through which the movable electrodes 22 extend. These movable electrodes, as well as the corresponding stationary electrodes, are arranged in pairs, one pair on each side of the center of the lamp. Each pair-of movable electrodes-22 co-operates with an electrode holder comprising a plate 23, having, at one side, a groove 24 receiving one of the electrodes 22, while the other part of the plate is offset at 26, and h a-saddle 25 swiveled thereto by rivet 26, which saddle receives the other electrode. The electrodes are clamped in this holder by clamping plate 29,- which engages the opposite sides of the electrodes and is clamped against the holder by bolt 30. The groove 24 and the saddle 25 are formed, as in the case of the, lower carbons, so as to permit of the clamping of electrodes of varying diameter in the same holders. An angle bracket 27 the upper end of which is bent laterally M33 and has an opening therethrough through which the clutch' operating rod moves, is fastened to the holder by bolt 30, washers 28; of insulating material, being mounted on the bolt on opposite sides of the bracket 27 to insulate the same from the carbon holder. The guiding brackets 33 which slide on the clutch operating rod 34, insure the accurate alinement of the upper and lower electrodes. These electrodes are guided at the points where they pass through the bracket 21 and by the sliding contact of the rods 34 with the edges of the openings These points are spaced a considerable distance apart, as will be seen from Fig. 3. Of course, a considerable clearance has to be provided in the holesin the guide brackets 21, to permit the electrodes to slide through them easily and'this clearance has the tendency to throw the upper electrodes out of alinement with the lower electrodes as they are fed downwardly. However, due to the guide arms 33, the guiding points are kept far enough apart .to insure true alinement of upper and lower sie etrodes at all points in their feed. The terminal 31 of circuit lead 32 may be inserted beneath the head of the bolt 30 in order to make electrical connection between this lead and the electrode holder. There are two electrode holders of this construction provided, one for each pair of the upper or movable electrodes, and these holders hold the electrodes clamped in parallel relation to each other. The saddle 25 permits a slight swiveling of the electrode which is clamped in it and this permits the electrodes to be straightened and alined more conveniently after they have been clamped in the electrode holder.

Each pair of movable electrodes is provided with a clutch and clutch-operating mechanism by which these electrodes may be raised and lowered with reference to the lower or stationary electrodes, in order to draw an arc. Each clutch comprises a fiat strip bent into a U-shaped form having the bight 38 of the loop embracing one of the electrodes, so as to clamp the same when.

tilted, while the legs 38' of the clutch member lie on opposite sides of the other electrode. A clutch-operating rod 34 extends through the guide hole in the portion 33 of bracket 27 fastened to the electrode holder, and the lower end of this clutch rod is bent laterally, at 35, and then again, at right angles, at 36, to form a portion which extends through both legs 38' of the U- shaped clutch member and is held in place with respect thereto by cotter pins 37. The clutch member lies just above and cooperates with the horizontal portion of the corresponding bracket member 21, as clearly shown in Fig. 11. The upper end of each, clutch-operating rod 34 is connected by a swivel or pivot connection with one of the two clutch-operating levers 39. The inner ends 40 of these levers cross each other and the levers are pivoted on the side members of the frame 10, at 41. The shape of the clutch-operating levers is best shown in Fig. 5, and it will be seen that each comprises a flat strip bent into U-form and having one leg longer. than the other and constituting the inner end of the lever which crosses the corresponding inner end of the other lever. .One of these longer legs is provided with a slot 54' in which a bolt 55', carried by the corresponding leg of the other lever, works in order to provide a pin and slot connection between the crossing ends of the clutch-operating levers. In Fig; 7, I have shown the connection between the upper end of a clutch-operating rod 34 and the corresponding outer end of the clutch-operating lever 39. A nut 42 is mounted on the upper end of the rod 34, and held in position thereon by the lock nuts 44 threaded on the rod-34 above and below nut 42, and the washers 43, of insulating material, interposed between the nut 42 and the lock nuts 44, so that the nut 42 is held adjustably fixed with reference to the upper end of the clutch-operating rod 34. The nut 42 is swiveled to the outer end of the operating lever, which straddles it, by a cross pin 45, which extends through the nut and through the legs of the operating lever, as shown in Fig. 7.

The clutch-operating levers 39 are controlled by a solenoid 46, which is mounted in a resilient manner within the rectangular frame 10. The

solenoid 46 is clamped between end plates 47,

which are held together by the clamping rods 48. The springs 49are fastened to the inner side of the side member of the frame 10, at 50, and have laterally extending spring arms 51 fastened to the ends of the end plates 47. These spring arms provide a resilient support ,for the solenoid46. The 'laminatedcore 52, which works within the solenoid, :has the laminations divided and the end portions iturned laterally, ;aS .at' 53, providing twooppositel-y extending arms-connected by coil springs '54 with the levers '39, theiupper ends of said springs 'being hooked into the ilevers at '55. In this way, there is a resilient connec-- tion between :the .core and the clutch-operating levers and a resilient support for the solenoid, and-I :have found that this arrangement is very effective to prevent chattering of the electrodes due to fluctuations in-the current-passing through the solenoid.

in -order to damp andcheck the movement of the clutch-operating I-levers, when moving in a direction to draw the arc, I have provided, instead of thevusual dash-pot, .a "brake mechanism which '1 have found particularly effective for :this purpose. A brake shoe P56 is -.provided:with a pair of 'ears -7 straddling one side member of the frame and secured thereto by the pivot :pin 58. A 'facing59, ofbra'king material, is applied to this shoe. A brake strap :60 {cooperates with this=brake shoe. 'The' lowenend-of this'lbrake strap is loosely embraced by a loop 61 mounted on a side enembe'r' of the frame. The*upper end :of the'brake strap hasan eye 62 to which is fastened one end of a link 63, the other end of said link beingturned laterally and ,=projecting through the legs of the corresponding operating .lever39. It willbe seen that, with this arrangement,-when the operating levers are moved in a direction to draw the arc, that is, to lift the movable electrodes, the link.63 will draw thebraking strap=60 into contact with the braking material 559 and retard the motion of the lever, while, when the levers move in the other directionyto :permit the electrodes to approach each other, the link 63 will cause the strap'to move away from 'thebrake shoe so that there will be no retardationof the corresponding movement of the operating :levers. The wiring diagram illustrating the electrical connections of the arc lamp is shown in Fig. 9. One :terminal to which one of the main circuit wires is connected is shown 91: 66, and this terminal is connected with the solenoid 46 by the connecting wire 65. From the other end of the solenoid-'46, a connecting wire 32 leads to the electrode holder for the right "handpairof upper or movable electrodes. The circuit leads from the terminal 66, therefore, through the .wire 65, solenoid-46, wire '32 and the right hand electrode 22 to the corresponding lower electrode and, thence, by thebarl'i to the left handielectrode 1'7, the left hand upper electrode :and the left hand electrode holder, and, thence, through the wire 67 to arterminal 68. The terminal 68 is connected to the lower end of a resistance coil 69 mountedon the right hand block 20 of insulating material. "The upper end .ofthis coil is connected by wire "10 with -a:correspond-' ing coil '71 mounted on theleft hand slab 20.0f insulating material, and the circuit is from the terminal 68, through the resistancecoils "'70 and '71 to the terminal 772, to which the-other main circuit wire 'is connected. it will be observed, therefore, that, whenever the circuit just described is closed, the solenoid .will .be energized to attract its armature and depress the inner ends of the clutch-operating levers 39,-thus raising the carbons'and causing the movable electrodes to separate from the lower electrodes. Whenever this circuit is brokenyhowever, as by the extinguishment'of the arc'drawn between the upper and lower electrodes, the-solenoid will be (lb-energized and the weight .of the .suspended electrodes will cause the clutch-operating levers to lift the core 52 and thus permit the upper electrodes to move into contact once more with the lower electrodes to re-establish the circuit.

The particular frame arrangement and the mounting for the electrodes, and the operating mechanism therefor, are particularly advantageous, since they balance the lamp laterally .as well .as foreand aft, reduce the lampfssize, :and insure ibetter'and more uniform lighting. The frame 10 constitutes the backbone of the lamp and is centrally located. Due :to the insulating block 12, the lower electrodes are mounted slightly in frontof the frame 10. The insulating boards i20.afiord supports for the brackets 21, through which the upper electrodes slide, in alinement with the lower electrodes. These insulating boards 20 extend fore .and aft of the lamp and are so arranged with the resistance coils 69 and'll thereon that the heat from the resistance coils is baflled and prevented from reaching the solenoid 46, which is located between the two insulating boards. Cool air passing through the opening '97 in the housing 86, which surrounds the operating parts, passes up around thesolenoid and the resistance coilsand out 'through'the openings 89. This frame -10not only acts as the backbone :of the lamp, but .also supports :the cabinet and the housing for the operating mechanism. Thetail member 11 of this frame extends downwardly through an opening in the bottom wall of the reflector or cabinet and this projecting lowerendof the vtailmember ll may be inserted in a tubular .socket ,upon a supporting stand, .so that the lamp may .be supported either from a -fioor.stand or from an overhead suspension, as hereinafter described.

Thelowerends of the upper electrodes 22 and the lowerlelectrodes .17 :are located within ahousing 'l3, "the top wall of which is secured to the lower portion of theframe 10 by the :bolts '74. Holesare provided in the top wall of this housing through which the electrodes 22 and the tail members 1110f the frame-extend, the latter afiording a support for the lower electrodes within the housing. This cabinet is .formed of suitable material andso shaped as .to serve ;as.a reflector for the light developed by the are formed between the adjacent ends of the upper and lower electrodes. 'To'this end, the rear wall 'l5,=is suitably curved along parabolic lines. The front edge of wall 751has aflange '76 curved forwardly to forma trough, which catches any sparks falling upon the bottom -.Wall .of the housing and prevents them falling from the open front of the .cabinet :to the floor .of the room in which thelamp is used. Theside walls 'l'lofthe housing are extended beyond the front edges of the top .and bottom walls, as .best shown inFig. 3. The :front of the housing is closedbyamovable front wall '78, having sidewalls 779 connected thereto which overlap the side wall extensions '17. "The front wall is adjustably fixed with reference to the housing, as by :the brackets 80,secured to theside wall 79 by the rivets 8i, and having portions 82 bent .back against the inner face of the side-wall '7']. Thumb screws :83 extending through the side walls 79 and the brackets 80, serve to clamp the side wall '77 against the :turned back portion 82 of .thebracket, and tohold the movable front wal1x78 in adjusted position. By adjusting this rfront vwall 178 back and forth the light emanating from the. arc can be directed as necessary in the use of the lamp. The front wall 78 is hinged to the housing by cars 84 at the rear upper end of the front wall, which are hinged to projecting ears on the housing by the pivot bolts 85, as shown in Figure '1; The rear edge of the upper wall 78 is bentinwardly at 78' so as to provide a ventilating slot at the top of the reflector or cabinet through which the hot air and fumes coming from the arcs may escape at thetop of the reflector.

This movable front wall 78 provides a cabinet having an opening of variable dimensions through which the light is directed; The direct light rays both from the craters of the upper electrodes as well as the flames of the arcs, are directed downwardly at an angle of about 45. The cabinet is so designed that the reflected light emanating from the flames and craters of the arcs is directed through the main opening of the cabinet. The lower stationary portion reflects the light of the craters throughthe main light outlet. The movable upper wall 78 of the reflector confines the light to a'variable area dependent on its position, so'that all the light can be concentrated on a small or large area. Thus, a doctor can treat his patient without subjecting himself to the intense rays of light, or a photographer can, by adjusting the front wall 78, determine the area which he will illuminate with the lamp and thus secure the variable lighting effects much sought after in the modern photographic art. If it is desired to soften the light, for photographic or other purposes, a diffusing screen may be arranged and drawn tight over th open front end of the reflector cabinet. 4

The operating mechanism of the lamp is covered by a housing 86 mounted upon the top of the reflector, as shown in Figure 1. A saddle member 87 is fastened by rivet 88 to the inner top surface of housing 86 and loosely embraces the top member of the frame 10. This saddle serves to center the housing 86 with reference to the operating mechanism and makes sure that it is properly applied so as not to interfere with any of the working parts. Angle brackets 90 are riveted to the housing 86 near the bottom of the side walls thereof, as shown in Fig. 2. The horizontal portions of these brackets lie upon the top wall of the reflector '73. These horizontal portions of the brackets 90 are provided with slots 91, which receive the bolts 92 by which the brackets 90 are clamped to the top wall of the reflector housing. Openings 89 in the upper corners of the housing 86 permit the circulation of air through the housing to cool the operating parts. This circulation is aided by the opening 97 formed in the central lower front portion of housing 86, which also permits the suspending arm to pass to the outside of the housing, as shown in Figure 1. A bar 93 is inserted between the tail members 11 of the frame and fastened in position there, as shown in Fig. 2. This bar is offset forwardly, at 94, and then extends upwardly, at 95, to form a suspending arm. A pulley 96 is fastened to the upper end of this arm, through which runs a cable by which the apparatus may be suspended from the ceiling or a supporting bracket. This suspending arm is located at such an angle that, when the apparatus is suspended by a pulley, as shown in Fig. 3, the electrodes will not be in true vertical alinement but will be alined in a plane tilted backward slightly from the vertical. The result of this is that a more efficient discharge of light is secured in that the crater formed at the cooperating ends of the electrodes does not tend to hide any of the light emanating from the hot spot at the meeting ends of the electrodes. By tilting the electrodes slightly from the vertical in this way, the crater is so formed that it opens slightly toward the front of the reflector housing and thereby the light is permitted to emanate directly from the crater through the open mouth of the housing and it is not concealed or interrupted by the walls of the crater.

I am aware that the particular embodiment of my invention illustrated in the accompanying drawings, and here described, may be varied considerably without departing from the spirit of my invention, and, therefore, I claim my invention broadly as indicated by the appended claims.

What I claim is:

1. In an arc lamp, the combination of a frame, a stationary electrode supported by the frame, a movable electrode cooperating with the stationary electrode to form an arc, a solenoid, yokes clamped to the top and bottom of said solenoid, a pair of coil springs carried by the frame and. each having a pair of laterally extending arms secured to opposite ends of the adjacent yoke to yieldingly support said solenoid, a movable core for said solenoid, a clutch cooperating with the movable electrode and connections between said core and clutch.

2. In an arc lamp, the combination of a frame including a pair of upright portions, a stationary electrode supported by the frame, a movable electrode cooperating with the stationary electrode to form an arc, a solenoid resiliently supported from one only of said upright portions of the frame, a movable core for said solenoid, a clutch cooperating with the movable electrode, and connections between said core and clutch including a resilient link.

3. In an arc lamp, the combination of a stationary electrode, a movable electrode cooperating therewith to form an arc, a clutch for said movable electrode, operating means for said clutch, a braking surface, and a brake member connected with said means and movable thereby into and out of brakingengagement with said surface.

4. In an arc lamp, the combination of a stationary electrode, a movable electrode cooperating therewith to form an arc, a clutch for said movable electrode, a clutch operating lever, a braking surface, and a brake member connected with said lever and movable thereby into and out of braking engagement with said surface.

5. In an arc lamp, the combination of a stationary electrode, a movable electrode cooperating therewith to form an arc, a clutch for said movable electrode, a clutch operating lever, a braking surface, and a brake member connected with said lever and brought into braking engagement with said surface when the lever is actuated to move the movable electrode and draw the arc.

6. In an arc lamp, the combination of a frame, a stationary electrode, a movable electrode, a clutch cooperating with said movable electrode, a braking surface mounted on the frame, a clutch operating lever pivoted on the frame, a brake member adapted to engage said surface, and a link connecting said member and said lever.

7. In an arc lamp, the combination of a frame, v

a stationary electrode, a movable electrode, a clutch cooperating with said movable electrode, a braking surface mounted on the frame, a clutch operating lever pivoted on the frame, a rod connecting said lever and clutch, a brake member adapted to engagev said surface and a link connecting the upper end of said member and the lever between the latters point of connection with the rod and its pivot.

8. In an arc lamp, the combination of a frame, a stationary electrode, a movable electrode, a clutch cooperating with the movable electrode, a clutch operating lever pivoted on the frame, actuating means connected to the inner arm of said lever, arod connecting the outer arm of said lever and-the clutch, a brake shoe mounted on the frame, a brake strap cooperating with the shoe, and a link connecting the upper end of said strap and the outer arm of said lever.

9. In an arc lamp, the combination of a frame, a stationary electrode, a movable electrode, a clutch cooperating with the movable electrode,

a'clutch operating lever pivoted on the frame,

. actuating means connected to the inner arm of said levena rod connecting the outer arm of said lever and the clutch, a swiveled brake shoe mounted on the frame,- a brake strap cooperating with the shoe, and a link connecting the upper end of said strap and the outer arm of said lever.

10. .In an arc lamp, the combination of a frame, a stationary electrode, a movable electrode, a clutch cooperating with the movable electrode,

, a clutch operating lever pivoted on the frame,

actuating means connected to the inner arm of said lever, a rod connecting the outer arm of said lever and the clutch, a brake shoe having a pair of laterally extending flanges located on oppositesides of a frame member, .a horizontal pin pivotally connecting said shoe to the frame and extending through said flang'es, friction material carried by the base of said shoe, a brake strap cooperating with the friction material of said shoe, and a link connecting the upper end of said strap and the outer arm of said lever.

11. In an arc lamp, the combination of a frame,

"a stationary electrode, a movable electrode, a

, clutch cooperating with the movable electrode, a clutch-operating lever pivoted on the frame, actuating means connected to the inner arm of said lever, a rod connecting the outer arm of said lever and the clutch, a brake shoe mounted on the frame, a brake strap cooperating with the shoe, a link connecting the upper end of said'strap and the outer arm of said lever, and a yoke fixed to the frame and embracing the lower end of said strap.

12. In an arc lamp, the combination of a frame, a stationary electrode, a movable electrode, a clutch cooperating with the movable electrode, a clutch-operating lever pivoted on the frame, actuating means connected to the inner arm of said lever, a rod connecting the outer arm of said lever and the clutch, a swiveled brake shoe mounted on the frame, a brake strap cooperating with the shoe, and a link connecting the up per end of saidstrap and the outer arm of said lever, and a yoke fixed to the frame and embrac ing the lower end of said strap.

13. In an arc lamp, the combination of a frame having a pair of upright members, a pairof stationary electrodes, a pair of movable electrodes, a pair of clutches cooperating therewith, a U shaped lever having a long and a short leg straddling, and pivoted to one upright frame member, the short leg terminating adjacent the pivot, the long leg exending inwardly beyond the pivot, a similar lever disposed upon the other upright member, the long leg of each lever being an alignment with the short leg of the other lever, whereby the long legs of the levers are disposed in side by side relation, a link connecting the outer end of each lever to its respective clutch, a solenoid, a core for the solenoid, and connections between said core and the long legs of the levers.

14. In an arc lamp, the combination of a frame including a pair of upright portions, a stationary electrode supported by the frame, a movable electrode cooperating with the stationary electrode to form an are, a pair of spring arms carried by andextending laterally from one of said upright portions of the frame, a solenoid inserted between and supported by said arms whereby said solenoid is yieldingly supported from the frame, a movable core for said solenoid, a clutch cooperating with the movable electrode and connections between said core and clutch.

JAMES H. WAGENHORST.

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