US2493957A - Flexible trigger throttle - Google Patents

Description

Jan. 10, 1950 c. E. FITCH 2,493,957

FLEXIBLE TRIGGER THROTTLE Filed Oct. 24, 1945 @wx/@gm l y 15 J.; 'Hwy JZ i /ffz Patented `an. 10, 1950 l Clifford E. Fitch, Bryan, ohio, assignor to The corporation of yOhio Arp Equipment Corporation, Bryan, Ohio, a

Application 0cto'berl`24, 1945, Serial No. 624,259

y This invention relates to a flexible"V trigger throttle fora .power tool, including a; portable motor which drives adevice such as, for example, .adrill or screw-driver...` 1

Such :toolsare usually formed withl a Vpro-v truding-.portion or handle adapted to be? grasped iin' 3' the fhand of the operator 'with ai trigger and an air va1veoperated by the trigger f-nathei handle.' In .'operationf, the device driven lguided by therhandle, and the trigger is pulled-by the foper'ators one I nger. to start the motor, similarly'to the Atrigger of a gun. However, it has beenlfound that such a tool may buck or-catch Ion'fthe -work,and when using only one iin'ge'rfv on 1 a trigger which is contacted by theftwo, long `fingers, of the hand, that is, the index and middle viin'gers, Aand furthermore to 'so form the resto f the handle tf'fat theshorter vfingers naturally have 'a good grasp'jthereon.

Itfps a further ,object ,of the invention V1:0 providegatrgger 0f the vtype described wherein'conf- "siderablei pressure must be exerted by two "fingers before the trigger is effective to'open the `air valve.,. A y. 'It isfa'rLobject` of another embodiment fof the invention to require. -ltwjo-ingerContact oi atrlg- `.ger oithetype. describedwherein pressure of one Iot-tile two-ngers is efectiveto open the air-valve.

- With. .these 'andv other objects in view, .myninviention consistsin the construction,.arrangement and combination of the various parts vofmy triggerv throttle:- whereby A the objects contemplated are'jattained, asA hereinafter more fully set forth,

pointed out in the claims, and illustrated in the w tion of the tool showing a second embodiment of .-50

the invention. l

rffeferring specically to thedrawing'in Figure :lic-numeral I!) designates a casing, preferably :formed of'fa plastic material and enclosing fa motor' 9 preferably operated' by compressed-'ain 'worlizing'head is shown at I I', for holding 'adrill or'scr'ew-driver.` Since the motor'and head form part ofzfthe presentinventiongfa detaile'df'description of these parts is unnecessary.

.6 claims. (01..,74-503) grasped by the operator. As will be apparent,the handlepermits vthe operator to solidly grip lthe tool-and a broad at trigger I3 is positioned near the forward top portion of the handle I2 so that the index and middle fingers of the operator Will contact the trigger I3 when grasped.--Thetig` ger I3 is received in a socket AIII and"-two"fa`lrl'y strong springs I5 and I6 adjacent the outer edge of the trigger I 3-urge/the trigger-outwardly." The `trigger I3 is loosely pivoted'by` al pin tI'I'f Va plunger or rod I8 whichenters a recess I9 'on lie innersurfaceo-the trigger and is spac'd'a" on. siderable distance from the walls of thereces's'. The'other end of the rod- -Illis connectedt valve'ZI for'controlling a Supply of compressed air which enters the tool through apassag` 22 and is conveyed to the motorrthrough, passages :aand 24. i' i When the operator grasps the'tool and presses the trigger, he must use two ngers to apply'pre'sfsure on both sides of the rod I8, as otherwise'the trigger will rotate about pivot pin I1 until rone or the other edge engages the wall of the Ysocket I4. Obviously the air valve 2I will not open cause no longitudinal movement is impartedjto the rod I8. Therefore a rm grip by the entire hand on the handle I2 is insured to depressi/the trigger against the action of both the springs I5 andIB. y1,-12 Referring now to Fig. 2 for a detailed descrip,- tion of the second embodiment of my invention, like numbersv are applied to like parts in the iilzst embodiment. In this embodiment, the trigger I3 is provided with two slots or passages 3| and 324 which extend completely through the trigger in a horizontal direction adjacent the springs SI5 and I6. Through pins 33 and 34 extend through the. passages 3l and 32 and are anchored inthe side Walls 35 of the socket I4. The through pins engagethe walls of the passages 3| and 32 nearest .the handle "|2.- In this embodiment, the index and' middle ngers of the operator naturally grasp the trigger-13; but pressuretapplied` by only' one nger will operate therairfvalv'e ZI-'lbecas'e the through pins prevent rotation of th'e trigger about thel pivot' pin` I'Vfwitho'ut depressing'n'e sideof the trigger and moving the rod' I8.'A 1'I'he passages 3l and 32 are sulciently large that suflcienthorizontal rnoven'fientY is affordedY to dei press the'A rod I8 and open Athe air'valve 2 I'. I -It'i's obvious that other devices than an fair valve' and a compressed air-operated moto'mfay be controlled by the improved-'triggerand handle arrangement." For example,"aneleotric'al cntact and anelectricmotor might be 4sl'ibstitutel lfothefair valve andv'compressed air motor.` M l ,Sonie' changes maybe Ymade in the' construe'- tin'f'ad 'ari'all"g'ellfielii'fl of 'the parts; =0f Y' my trigger The casing I0 is provided with ahandle I2 to be lo throttle without departing from the real Spirit 1. In juxtaposition to a handle to be grasped by the hand of an operator, a flexible trigger throttle for a power tool comprising a trigger, said trigger being of such size and being so positioned that the index and middle fingers of the operator naturally rest thereon when the tool is grasped,- a device to be moved by the trigger, means vfor .in using the tool.

' i2. `In a juxtaposition to a handle to be ,grasped by the hand of an operator, a'fiexibletrigger throttle for a power tool comprising a trigger, saidV trigger being of such size and being so positioned that the index and middle fingers of the operator naturally rest thereon when the tool is grasped, a device to be moved by the trigger, a plunger for connecting the central portion of the trigger to said device, a pivotal connection'between the trigger and the plunger, stops in said handle for the edges of the trigger and separate resilient meansV located between said handle andthe trigger and in spaced vsymmetrical relation to said pivoted connection for urging the trigger and the plunger against the force applied by the operator in using the tool, said stops being so positioned that if pres'- sure isapplied to overcome the force of oneoi saidresilient means only, the trigger strikes one of the stops before it depresses said plunger. Y,

3.'In juxtaposition to a handle to be grasped bythe hand of an operator, a flexible trigger throttle for a power tool comprising a trigger, said'trigger being of such size' and being so .positioned that the index and middle fingers of the operator naturally rest thereon when the ktool is grasped, a'l device to be operated by said trigger, Ya plungerf for connecting the central portion ofthe trigger to'said device, a pivotal connection between the trigger andthe plunger, said 'handle having a socket for' receiving the .trigger and including stops for the edges of the trigger and separate resilient means located `between said handle and the trigger and. in spaced Vsymmetrical relation to said pivoted connection for urging the trigger and the plunger against the. force applied-by the ,operator in using the tool. said stops being so positioned that if pres,- sure is applied to overcome the force of one of saidresilient means only, the trigger strikes one of the stops before it depresses saidplunger..` Y v 4.7In juxtaposition to a handle to be grasped by-V the'hand of an operator,l a flexible trigger throttle for a power tool comprising a trigger, said/trigger being of such size and being-,so positioned that the index and middle fingers .of k,the operator naturally rest thereon when the tool is grasped, a device to be operated by the trigger, a plunger for connecting the central portion of the trigger to said device, a pivotal connection between the trigger and the plunger, said handle having a socketfor at least partially receiving said trigger, separate resilient means located between said handle and the trigger and `above and below said pivoted connection for urging the trigger and the plunger against vthe force applied by the operator in using the tool, a horizontal slot formed in the trigger adjacent each kof the resilient means, a pin extending through each slot and anchored at both ends in the walls of said socket, said pins being normally held in l0` engagement with one portion of the slots by the action'of the resilient means, whereby if pressure is applied to overcome the force of one of said resilient means only, the trigger pivots about the pin adjacent the other resilient means and motion is transmitted to said plunger to operate said device.- f

5. In" juxtaposition to a handle to be grasped by the hand of an operator, a flexible trigger throttle for a power toolcomprising a trigger, said trigger being of such size and beingsogpositioned that the index and middle fingers-of the operator naturally rest thereon when the tool -is grasped, a device to be operated by said trigger, a plunger for connecting the central portion '-of, the trigger to said device, a pivotal connection between the trigger and the plunger, separate resilient means located between said handle'and the trigger and above and below said pivotal connection for urging the trigger and the plunger 1 against the force applied by the operator in using the tool, a horizontal slot formed in the trigger adjacent each of the resilient means, a pin extending through each slot and anchored at Vboth ends in ksaid handle,V saidV pins being normally held in engagement with one portion ofthe slots byY the action of the resilient means, whereby if pressure is applied to overcome the force ofA one of said resilient means only, the trigger pivots about the pin adjacent the other resilient means Vand motion is transmitted to said plunger to operate said device. V 6. ,Inrjuxtaposition to a handle to'be grasped vby the hand of an operator, a ilexible'triggr throttle for a power tool comprising a` trigger, said trigger being of such Vsize and being so po'- lsitioned that the index and 'middle ngerso the operator naturally'rest thereon' Whenfth'e Ytool is grasped, a device to be operat'edfby said trigger, arod disposed centrally of the trigger f for connecting the 'trigger to said deificeymsai'rl,l rod being loosely pivoted to the trigger,` and ref Vsilie'nt means comprising `two springs located beftween said handle and theV trigger for urging the.

ltrigger and the connecting rod against-'theforce applied-bythe operator in using the tool, said springs being so positioned that they are approximately'under those portions of the trigger which are'co'ntacted by said index and middle fingers.

CLIFFORD Yn. Errori. REFERENCES CITED I v YThe following references are of record the file of this patent:

i UNITEDV STATES PATENTS Kahler Apr; 17,1 1945

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