US998564A - Electromagnetic cutting-tool. - Google Patents

Description

LE ROY T. BUNSALL.

ELBGTROMAGNBTIG CUTTING TOOL.

APPLICATION FILED 15113.22, 1909.

998,564, l Patented July 18, 1911.

UNITED STATES PATENT oEEicE.

LE ROY T. BONSALL, OF CHARLESTON, WEST VIRGINIA, ASSIGNOR 0F ONE-THIRD TO ARCHIBALD A. KRIEG, OF CHARLESTON, WEST VIRGINIA.

ELECTROMAGNETIC CUTTING-TOOL,

To all whom t may concern.'

Be it known that I, LE ROY T. BONSALL, a citizen of the United States, residing at Charleston, in the county of AKanawha and State of lVest Virginia, have invented new and useful Improvements in Electromagnetic Cutting-Tools, of which the following is a specification.

This invention relates to clectro-magnetically-'operated tools, and particularly to a coal pick or cutter adapted to be actuated by electro-magnetic operating means.

One object of the invention is to provide a simple, strong, durable, and comparatively inexpensive construction of tool of this character which is eicient in action and under' the thorough control of the operator.

Aiother object is to provide a tool which when set in action will continue to operate automatically until thrown out of action, or until the bit strikes an unusually hard object through which it cannot cut withoutliability of injury thereto, when the motion of the tool will be arrested and its action may be manually controlled as circumstances require.

The invention consists of the features of construction, coinl'iination and arrangement of parts hereinafter fully described and claimed, reference being had to the accompanying drawing, in which .Figure 1 is a longitudinal section of atool proper, its supporting truck or carriage being omitted. Fig. is a bottom plan. View of the switch mechanism thereof.

Referring to the drawing, 1 designates a suitable frame or casing of magnetic material, including in its construction front and rear end heads 2 and 3 and a central chainber or con'ipartment 4, the latter being formed between spaced magnetic partitions 5 and t3,

lithin the forward portion of the easing between the head 2 and partition 5 is inclosed a solenoid 7, and similarly arranged within the rear portion of the easing bctween the head 3 and partition t3 is a solenoid 8. i

'lhe heads and partitions are perforated for the passage of a 'reciprocating plunger 9 composed of a pair of cores l() and ll of ironl or other suitable material which are suitablil mounted in the usual manner in the solenoids 7 and S and influenced when said solenoifls are energized to move the plunger forwardly and backwardly. The two cores Specification of Letters Patent.

Application filed March 22, 1909.

Patented July 18, 1911.

serial No. 485,060.

10 and 11 are connected by an interposed section or couplingr 12 of non-magnetic material, and upon the forward end of the core 10 is suitably secured a non-magnetic head or portion 13 with which is connected y the cutter-bitl carrying shank or stem 14. Secured upon the heads 2 and 3 are air cushion chambers 15 and 16 or equivalent cushioning devices which check and limit the movements of the plunger at the ends of its Working and return strokes, and also secured upon the head 2 is a' frusto-conical tube or sleeve 17 having an opening in its outer end for the passage of the stem let. and which serves as a guide and brace or support for said stem in `its reciprocating motion.

Supported within the chamber 4 by the partitions 5 and 6 is a guide bar or bracket- 18 having a longitudinal guide slot 19, which slot supports a reciprocating shifter 20 having a guide portion 21 movable within said slot and terminal tappets or projections 22 and 23. The said shifter is also provided Ywith an outwardly projecting handle 2t by which it may be manually adjusted and controlled. Extending from the coupling member l2 of the tool plunger is a tappct or projection 25 which is movable in Athe slot 1t) andv adapted to engage the said tappcts or projections 22 and 23 upon the shifter, to automatically and alternately slide the latter backward and forward in the chamber 4.

livotally mounted at their inner ends upon the bracket plate, as at 2G, are swinging circuit closing levers or terminals 2T and 28, which are coupled .to move in unison by a link 29, theinner ends of said levers hcing beveled or rounded for contact with the opposite ends of the switch shifter, by

which they are adapted to be swung,-

through the reciprocation of the shifter, on their pivotal connections 2t) lniekwardly and forwardly in a direction longitudinally of the tool. .itt their outer ends the levers 2S respectively carry carbon or other contacts 30 and 3l which are adapted, by the reva rse movements of Isaid levers, to engage an intermediate stationary carbon or other cont'aet 52 connected witlrone of they lead wires -l of an electric circuit Asupplied with current from any suitable source, the other wire 'i-'t of which circuit'.I is connected by a conductor 35 with both solenoids to operate as a. common return or ground connection for each, as will be readily understood.` The yio front contact 30 is connected with the solenoid 8 by avcouduetor 3G. while the rear contact 3l is connected with the solenoid 7 by a conductor 3T. The shifter 2O is of less length than the distance between the beveled ends of the switch levers 27-28, so that it has an intermediate inoperative position to cut-ott' connection between both solenoids and the source of electric supply to stoppthe operation of' the tool, and it is adapted, at the respective limitsl of its forward and rearward movements, to engage the levers "it" and QS and alternately throw the ,f fontaets T and 3l into engagement with thclcontact 52, wherebyY the solei'ioids will he alterinatel)v energized and deenernized to project and retract the plunger core.

ln the use of the tool it will be understood thatthe cuttingy bit; is applied to the i :torward end of the shank or stem 14, the

tool adjusted to bring the bit into cutting position, and said tool then set into operation by throwing in a cut out switch, not shown, in the line` which will energize whichever solenoid the contact i532 is in connection with and set the tool into action, the operation thence being automatic. Assuming' that the contact 32 is in engagement with contact El when the line switch is thrown, it. will be apparent that the solenoid T will be energized to propel the plunger on its forward or cutting' stroke. then the plunger nears the limit ot' its forward Inovenient, its tappet cr projection engages the .tappet Q2 ot' the shi'tter Q0 and moves said shitter 'forward so thatl it will strike. the lever 2T and thus swing the switch levers to throw the contact 3l out. ot' and the contact 2l() into enezugement, with the contact 32, thus .cutting the solenoid T out oil circuit and throwing the solenoid 8 into circuit for enere-iz/.ation to retract' the plunger. Near the limit oi" its return stroke the tappet Q5 ot the plunger engages the tappet. 23 ot the switch shi't'ter and moves the shifter backward so that. it will strike the lever 28 and shit't both switch levers to throw the contact 30 out. ot' and the Contact 31 into engagement with the contact 32, thus again energizing the solenoid 7, and this automatic shitting" ot' the switch bach and l'orth to alternately energize the solenoids 'l'or the automatic action ot the plunger will continue during.,y the normal operation of the,tool. ihe operator may, ot course, stop the operation ol the tool at` any time by simplythrowiup; out the cuty out switch in the line,b,ut the tool may be started by adjustingr the shifter Q() by means of its handle 2l in case the switch contacts should from any cause be stopped in a neutral position. It on .the cutting motion of the plunger the bit should sti-ikea particularly hard object which it can not penetrate, thus arresting the plunger and stopping the switch contacts in a neutral position, the operator may manually shift said switch lto etl'ect the retraction of the tool and its subsequent propulsion on its working stroke, and this action may be continued to govern the operation of the tool until the hard material is cut through, when the automatic action may be resumed. Provision is thus made for the thorough. and effective control of thev tool in operation under any and all conditions of service. The cut out switch will be placed at a convenient place so as to be easily reached and manipulated by the operator.

It, will be seen from the foregoing' description that a siniplc,retiicient and reliable type ot' electro-nechanically-operated tool is provided which may be rapidly operated and idriven by a current from a sto age bat,- tery or other suitable source of supply through the use oit flexible conductors,which will l-rrnit the vtool to be easily adjusted and transported from place to place.

HavingVA thus t'ullv described the invention, what is claimed as new, is t A tool of the character described compris in; a casing;- having a central opening` at one side. thereof. solenoids arranged within the opposite ends oi the said casing, cores operating` therein and connected to form a plunger, the solenoids being' spaced to form a central chamber in the .casing opposite said opening'. a `ruido b lacket arranged within the chamber, a shifter bar mounted to reci-prta-ate upon the bracket and having spaced laterally extending tappets and a handle. the. latter projectingy outwardly through said opening in the side of thecasing', a tappct upon the central portion of the plunger tor coaction with the tappets on the shi'tter to alternately move the shifter in opposite directions, horizontal switch levers eccentrically pivoted on the. bracket and having: their short arms provided with i'eversely beveled end portions adapted :to be.""alter natelv engaged by the ends oit the shifter. a link means coi'inectiug the lone' arms ot. the levers t'or n'iovement in unison, contacts carried by the lone' urn/is ol the levers and electrically connectedfwitliltherespective solenoids. and a niain. cii'ttitit contact arranged between and "adapted y' to be engaged by the a'toresaid contacts, said levers. link and contacts being' inclosed with the shifter within the central chamber.

ln testimony whereof l aHiX my signature in presence of two witnesses.

LE ROY T. BOSALL. ll/iitnesses:

C. C. Hnins,

JOHN L. FLETCHER.

llt

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