Патент USA US2412083код для вставки
Dec. 3, I |_, D_ GIANTVALLEY 2,412,083‘ STINGER Filed Dec. 23, 1944 INVENTOR. LAWTON D. G/ANTVALLEY OZfWW7WW HIS ATTORNEYS Patented Dec. 3, 1946 2,412,083 UNITED STATES PATENT OFFICE 2,412,083. STINGER Lawton D. Giantvalley, Oakland, Calif., assignor of one-half to Carl F. Carlson, Oakland, Calif. Application December 23, 1944, Serial No. 569,556 6 Claims. (Cl. 219—4) 2 My invention relates, to stingers, and more par ticularly to stingers for use in the application of insulation to walls of metal.’ Among the objects of my invention are: (1.) To provide a novel and improved stinger for use in applying insulation to walls of metal; for holding-the chuck in its assembled position (2) To provide a. novel and improved stinger of light weight andcapable of extremely efficient use. in the application of’ insulation to metallic in the front wall adjacent the finger channel 35, which will normally be occupied by the index ?nger, the wall is provided with an opening 49 10 to permit of the protrusion of a ?nger control ele surfaces; ' during use of the device. The body is contoured to provide a pistol grip including ?nger channels 35,31, 39 and 4| in the front wall 43, and a shoulder 45 in the upper por tion of the rear wall 41 of the body. At a point (3), To provide anovel and improved stinger permitting of the welding of insulation holding ment such as a trigger 5| forming part of a switch assembly 53 mounted on the inside of the pins in. a minimum of time; (4) To provide a. noveland improved stinger for the application of insulation to metallic sur front wall of the hollow body. This trigger extends through the bottom 55 of the switch assembly and is mounted on a pivot 51 supported between the side walls 59 of this assembly. Movement of the trigger controls the faces, such stinger having a contour conducive to the eiiieient use thereof; ' (5.). Tolprovide a novel and improved stinger of extremely simple design, for use in applying insulation to metallic surfaces. \ Additional objects of my invention. Will be brought, out in the following descriptionof a pre ferred embodiment of the same, taken in con junction with the accompanying drawing, Where 20 of extended contacts 65, each of which is mount, ed- on one side of a block 61 of insulation affixed to the bottom of the switch assembly. The switch is made self-opening by means of a restor ing spring 69 surrounding the trigger pivot and 25 exerting pressure against the trigger in the direc 1n— Figure 1 is a plan view with cover plate re moved; operation of a switch including a toggle 6 l, which carries a connector 63 adapted to bridge a pair . Figure 2 is a section taken in the median plane of the device. tion of opening of the switch. Closing of the switch is effected by ?nger pres sure upon the trigger, and as long as such pres sure is maintained, the switch is restrained from Referring to the drawing, my improved stinger 30 opening under the restoring action of the spring. As soon as-the ?nger pressure is removed, how ever, the spring is free to act against the trig ger and throw the toggle in the reverse direction, to bring about a quick opening of the switch. able to the principal body portion by machine screws engaging bosses 9 and II extendingtin 3.5 In‘ adapting the stinger for use, the cable 2'! wardly from the opposite side of the body, which forms the high side of a welding circuit, is connected through the normally opened con At one end of the body, there is mounted a chuck I3 for receiving the large disk-like head tacts of a solenoid or relay ‘H to the high side of l5'of a pin ll employed in ailixing insulation a source of low voltage power such as a gen l9 to a metal wall 2|. This chuck includes a cir 4.0 erator (not shown), the low side of which is cular arrangement of chuck jaws 23 for resil normally grounded. The switch is connected in embodies a hollow body I preferably of metal and having an opening 3 and 5 at each end respec tively, and‘ including a side cover plate ‘I a?ix iently receiving the pin head, and an integral the low side of anauxiliary circuit '13 which feeds shank 25 extending into the end opening 3. This the winding of such solenoid or relay. Inasmuch shank is preferably hollow and internally thread-v as this auxiliary. circuit embodies the solenoid ed to receive one end of a cable 21 entering the 45 or relay winding, the snap action realized through hollow body through the other end opening 5. the-use ofya toggle. switch in the opening and A setscrew 29 through the shank serves to guard against accidental disconnection of the cable therefrom. ~ closing of the circuit is highly desirable in mini mizing arcing-at'the. contacts of the switch, In utilizing" the device, a pin is snapped be A sleeve 3| of insulation surrounding the chuck 50 tween the- chuck jaws, the switch is closed and shank 25 serves to insulate the body proper from held in such condition to energize the welding circuit and temporarily maintain it so, following the cable and chuck. This insulating collar also which the pin is pushed through the insulation permits of the application of pressure to the until contact with the metal wall is effected, and shank by means of a setscrew 33 through the wall of the hollow body, to provide positive means 55 then withdrawn slightly to establish an are be gimme 4 condition during application of pressure thereto. tween the point of the pin and the wall to pro duce a weld. The establishment of an arc, I have 2. A stinger for applying insulation to metallic found, can readily be sensed by an operator, surfaces, comprising a hollow body of a size and contour to ?t the hand of an operator, and hav ing an opening at each end, means insulatingly for this condition sets up a slight pull on the pin, which is readily detectable by the operator. At this instant, the welding circuit may be opened by removal of ?nger pressure from the switch trigger, following which I have found it possible to remove the stinger from the pin head with out delay. Thus only the minimum amount of 10 time is utilized in the welding of the pins through ' the insulation to the metal wall. When forcing a, pin through the insulation, the shoulder 45 provides foref?cient application of pressure in the direction of the pin axis with out necessitating a conscious effort on the part supporting a pin head holding chuck in one of said end openings for connection to a cable in sertable through the other of said openings, a self-opening switch mounted within said body and including control means extending outside thereof and actuable within an area normally oc cupied by the ?ngers of such operator’s hand in gripping said body, for restraining opening of ' said switch from a closed condition during appli 15 cation of pressure thereto. 3. A stinger for applying insulation to metal ' . lic surfaces, comprising a. hollow body in the shape In conjunction with the fact’that an opera tor, once having developed this sense of feel of a pistol grip and having an opening at each end, means insulatingly supporting a pin head of the operator toward this end. ’ which determines the minimum time require 20 holding chuck in one of said end openings for ment in the actual welding of the pin, the ex-' treme simplicity of my device enables the same to. be designed to minimum weight requirements, thereby makingit possible for an operator to connection to a cable insertable through the other of said end openings, a self-opening switch mount ed within said body, and including means ex tending outside said body for restraining open minimize on time, in carrying through the other 25 ing of said switch from a closed condition during application of pressure thereto. steps associated with the procedure involved in 4. A stinger for applying insulation to metal utilizing the stinger. ‘ _ ' ‘I lic surfaces, comprising a hollow body in the Additional advantages accrue by reason of my shape of a pistol grip with ?nger channels in improved stinger, in that thewelding circuit may belmaintained energized if desired, fora period 30 the front wall and a shoulder in the rear wall, and having an opening at each end, means sup in _ excess of the minimum normally required porting a holding chuck in one of said end open in the welding of a pin.’ This becomes of inter lugs for connection to a cable insertable through est‘ under conditions where a pin effectively'be the other’cf said end openings, a self-opening comes vtoo long for application at a particular point, in which case, through the continued appli 35 switch mounted in said pistol grip shaped body, and including a trigger extending outside said cation‘ of'pressure and'maintenance of the ener body vand actuable within the area occupied by gized'welding circuit, the 'pin' may be burnt down said ?nger channels, for restraining opening of until the chuck bears against the outer surface said switch from a closed condition during appli of theinsulation, at which time the welding cir cation of pressure thereto. ’ » cuit may be opened and‘the stinger removed. 5. A stinger for applying insulation to metal ' ‘It may be noted also that the bosses which lic surfaces, comprising a hollow body including serve for a?ixing the cover plate, "not only per a removable cover plate, a pin head holding chuck form this particular function,‘ but are so disposed supported at one end‘of said body for connec as to maintain'separation between the cable and tion to a Welding cable insertable through the the ‘switch, and thus act‘ as a guard to protect other end thereof, a switch mounted within said operation of the switch against'interfering move body and having a ?nger control extending “ment of the cable within the stinger body. through a wall thereof, said switch being adapted _ The simplicity of my device reduces troubles to open‘ or close an auxiliary circuit, .a boss ex ‘to a minimum, and if and when repairs may be ‘needed, the same may be effected on the job 50 tending interiorly of said body from the wall op posite said cover plate to which said cover plate with ‘a minimum loss of time and minimum may be a?ixed, said boss being. located between expense. . such cable and said auxiliary circuit switch to Thus it is apparent that my device ful?lls all constitute a guard for said switch. the ‘obiects of my invention as previously, recited, '6. A stinger for applying insulation to metal and whileI have disclosed a preferred embodi lic surfaces, comprising a hollow body with an ment of the same in great detail, I do not desire opening at each end and a trigger opening at to be limited in my protection to such details, an intermediate point,lpin head holding chuck except as may be necessitated by the appended having a hollow shank extending through one end claims. opening in said body to receive. and hold one end I claim: of a cable inserted through said other end open ‘_ l. A stinger for ‘applying insulation to metal ing, means insulating said shank from said body, lic vsurfaces, comprising a hollow body of a size a toggle switch mounted withinsaid body adja ‘and. contour to ?t the hand of an operator, and cent said trigger opening, said ‘switch'including having an end opening, means supporting a pin va restoring spring for automatically restoring said head holding chuck in said end opening for con . switch from a closed to an open condition, and a nection to a cable, a self-opening switch mount trigger ‘extending through said trigger opening ed in said body and including control means ex ‘adapted, while under pressure, to oppose the re tending outside thereof and actuable within an storing force of said restoring spring. .area normally occupied by the ?ngers of such operator’s hand in grippingsaid body, for re 70. straining opening of said switch from a closed LAWTON D. GIANTVALLEY.