US1501076A - Footstock - Google Patents

Description

July l15v 19-24.

H. E. TOWNSEND FOOTSTOCK Filed May 3l. 19255 2 sheets-Sheer;

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Lsom'ls H; Ef TOWNSEND FooTsTocvK 2 Sheets-Sheet 2 Patented `luly 15, 1924.

istie HERBERT E. TOVJNSEND, OF EAST PROVIDENCE, RHODE SLAND, ASSIGNOR TO'BROWN v AND SHARCPE'NLANUFACTURENG COMPANY, OF PROVIDENCE, RHODE ISLAND, A

COBPO-RATO'N GF RHODE SLAND.

Application filed May 31, 1923.

.To 'all whom t may] concern Be it known that l, HERBERT E. TownsEND, a subject of the King of Great Britain, residingat East Providence, in the county of. Providence and State ofRhode Island,

have. invented certain new and useful. Im proveniente in Footstocks, of which the following is a specification.

My invention relates'to foot-stocks.

rIhe main object of my invention is to provide ay foot-stock hav-ing resilient. means for exerting pressure against the work holding member thereof, said means comprising two or moresprings adapted tobear against said member successively. In the form shown these comprise a heavy spring for holding heavy work and a light spring for holding light work. It has been found in practice that the present standard types of springs are ofnot sufficient inherent adjustability to bev adapted to hold all kinds of work. The ordinary foot-stocks will not hold very heavy work,and when called upon to hold a light rod will cause it to bend and buckle. My invention therefore makes possible a foot-stock adaptable to holdvall kinds of work.

A further object of my invention is to provide a foot-stock with improved lmeans for accurately varying the tension exerted thereby. 1

A further object of my invention is to provide a foot-stock of improved construction, simple and easy to manufacture.

These and such other objects of myinvention as may hereinafter appear will be lbest understood from a description of one embodiment thereof such as is shown in the accompanying drawings.

ln the drawings, Fig. 1 is a central longitudinal sectional view of my invention, parts being shown in elevation, showing the heavy spring in operativelposi'tion when supporting someiheavy work.

Figp2 is a view similar to Film1., showing the light spring in operative position when i supporting some light work.V

Fig; 3' is a cross section taken' along the lines 3-3' of Fig. 2.

4 is across section taken along the lines 4-45 of Fig. 2.

-is a sectional view taken along the lines 5 5 of Fig. 4, showing the locking bolt in locking position. i s

Serial No. 642,495.

In the drawings, wherein like characters of reference indicate like parts throughout, 10 is the foot-stock body portion, which in the embodimentshown comprises a portion. 10a integral with a supporting base` portion 10b, whichis mounted as usual on the table 11A of whatever type of machine is used, and a breech or outer portion 1()c threaded thereto, and held in position by the locking screw 10d. I employ the words inner and inward to mean near or towards the work, and the words outer and outwards to mean away from the work, the foot-stock being posi-v tioned relative to the center of the machine. Both said portions 10a* and 10.c are longi tudinally bored to form the' barrel 10e`of the .14h is being held in Fig. 2. A dust cap 15 is threaded on the inner end of the spindle 12. The outer end of the slidable spindle 12 is chambered as at 12b for a purpose to be eX- plained later. A groove 123 (Fig. 3) is cut in the outer periphery of the outer end of the slidable spindle 12 to receive a spline 10g raised on the adjacent portion off the inner periphery of the barrel 10e toV prevent rotation of the spindle 12 during its slidable longitudinal movement therein. The boreof the barrel 10e is contracted as at 10h at the outer end of the portion 10, as shown in Fig. 4. A bushing `16 is slidably mounted inrsaid reduced bore 10h, said bushing 16 having an integral collar loa raised atits outer end to limit its inward movement. i The spindle adjusting screw 18`is revolvably seated in and slidable with said bushing. Its inner endis threaded as at 18a and'eXtends into the chambered outer end 12b ofthe spindle12. Ylts outer end is provided with ak hand wheel 18b and the collars 18c and. 18d are secured thereon to enclose both ends of the slidable bushing A16;; A T-shaped nut 20 internally said T-shaped nut 20`is limited by the shouli der b thereof. A heavy helical spring 22 is loosely coiled around the inner end of the spindleA adjusting screw 18, the inner end thereof being seated against the inner end 12`1 of the chambered portion 12b of the slidable spindle 12, and the outer end thereof being seated against the inner end 20c of the slidable nut 20. A spline 18 is raised on the outer periphery of the slidable nut adapted to register ina groove 12e cut in the inner peripheryv of the chambered outer end 12b of the slidable spindle 12 to-prevent rotative movement of said nut 20. As explained, the bore of the inner end of the outer portion 10C of the body portion 10 is largerthan the p bore 10 at its outer end. Adapted to slide in Vsaid enlarged bore 10i between the bore 10h and the shoulder lOf, is the sleeve 24. Said sleeve 24 surrounds said nut 20 which is slidable therein, and is provided with a forwardly pr'ojecting annular portion 24a, which is attached by means of the screws 25 (Fig. 3) to the outer end 12b of the spindle. The inner end of said portion 24a contacts the shoulderlOf, formed on the barrel 10e as explained, and limits the inward movement of said sleeve 24 and attached spindle 12. Where Athe'forward projection 24a joins the body 24b of the sleeve 24, an annular shoulder `24c is thus raised on the inner periphery thereof. Said shoulder 24C contacts the shoulder 2()b to limit the outward movement of said nut 20 as explained.

Means are provided to lock the slidable bushing 16 and enclosed spindle adjusting screw 12 to the breech of the barrel 10e. The preferred embodiment of said means is shown in Figs. 4 and 5. A transverse segmental groove 16b is cut in said bushing 16. A radial bore 26 is sunk in the outer portion 10C of the body portion 10 from the outer periphery thereof through to kthe contracted bore l0, and a locking bolt bushing 27 is suitably secured therein. Said bushing 27 is provided with an internal bore contracted at the upper end 27a and' enlarged at the lower end 27b thereof. The upper edge of said circular bushing is provided with slots 27c which extend ,downwardly a short distance thereof for a purpose to be described. A locking bolt 29 isslidaloly mounted in the bore of said bushing 27. The Lipper end of said bolt 29is provided with a lnurled head 29a for the turning thereof. Just below the knurled head 29a, transverse locking pin 29b is pro- Yvided on said rod. The diameter of said 'bolt i ofthe enlarged ybore 27 b of th'ebushing 27,

and the upper Shoulder 29d of the enlarged portion 29c of said locking bolt 29. The operation of said locking means is obvious from the above description. lhen it is desired to lock the bushing 16 to the barrel 10e, the groove 16b being opposite the locking point 29f, the knurled head 29a is turned until the pin 29b is positioned above the slots 27. The spring 31 will then push the locking bolt 29 down and the locking point 29 thereof will register in the groove 16", thus locking the bushing 16 to the barrel 10e against longitudinal movement therein (see Fig. 5). To free the bushing 16, pull up on the knurled head 29"- against the pressure of the spring 31. The locking point 29t will be withdrawn from the locking groove 16b on the bushing 16, and the locking pin 29b from the slots 271. Turn the knurled head 29a and integralrod 29 a part turn, and the pin 29b then registering against the upper edge of the circular bushing 27 will retain the bolt 29 in unlocked position (Fig. 4).

Any type of suitable light spring means may be provided. In the embodiment shown, three longitudinal bores 10j are cut in the enlarged annular portion of the barrel 10e circumferentially of the reduced bore 10h. An end plate 33 is secured to the outer end of the barrel 10e. A coil spring 34 is placed in each bore 10j, as shown in Fig. 4, and is seated against said end plate 33. Said springs are provided with the tubular caps 35 of the approximate length of said bores, adapted to slide in said bores 10j and into the enlarged bore 10i of the portion 10C. The inner ends 35a of said caps are adapted to contact the sleeve 24 and thereby axially actuate the attached spindle 12.

The means I employ for bringing either the heavy spring 22 or the light spring 34 into operative position will now be described. A slotted longitudinal runway 10k is Cut the entire length of the enlarged annular portion of the barrel 10e underneath the bushing 16. A transverse groove 16 is eut in the bottom of said bushing 16, and the block 36 seated in said groove and secured to said bushing 16 by the pins 37. A transverse groove 36a is out in the bottoni of said block- 36. Opposite the central portion of the runway 10k, a longitudinal slot 10I is cut through to the outer periphery of the barrel, and the barrel portion 10c is raised up on either side of said slot 10I to form bearings 10m to receive the pin38 mounted therein transversely of the slot 101. On said pin 33y is pivoted the shifting lever 39. The power arm 39a thereof extends obliquely outwardly and downwardly in the form of a handle, and the work arm 39h thereof comprises a toothed projection adapted to register in the transverse groove 36a cut in thebottom of said block 36.

The operation ofmyinvention is obvious from the above description. .It is apparent lili) that the bushing 16, spindle adjusting` screw 18, nut 20, sleeve 24 and spindle 12 are all connectedl and are axially slidable in the barrel 10e. When the footstock is empty, the light springs34 will tend to force the sleeve 24, vattached spindle 12, nut 20, threadedly attached spindle adjusting screw 18, and enclosed bushing 16 inwards, until the collar 16a contacts the end plate and limits the inward movements thereof. The pusher ro'd 29 will now be opposite the groove 16b and the bushing 16 may be locked to the barrel 10e as explained. This xedly secures the spindle adjusting screw 18 to the body 10. The foot-stock is now in a position tof hold some heavy work as indicated in Figs. 4, 5. The hand wheel 13"D is then turned to the left and the threads 13a of the spindle adjusting screw 1S en-k gaging the threads 2O'd on the inner pe riphery of the nut 20, draw the nut 2O to its outermost position. The shoulder 20b ofthe nut contacting the shoulder 24c of the sleeve 24, draws the sleeve 24 and attached spindle 12 outwards against the pressure of the light springs 34 until the outward movement thereof is arrested by the sleeve 24 contacting the inwardly enlarged annular portion of the breech 10. The work 14a is then placed in position in front of the dead center 13, and the hand wheel 13b turned to the right. The work 14 opposing the inward movement of the dead center 13 tends to force the spindle 12 outwards against the pressure or" the springs 22 and 34. As the hand wheel 18b is turned and the nut 2O is free to move inwards on the threadedV portion 18a of the spindle ad justing screw 1S, the. light spring 34 exerts its tension to force the sleeve 24 and attached spindle 12 inwards against the work. The tension of the light spring is usually insuiiicient to hold heavy workl However, my invention provides for this as follows: TheV spindlefadjusting screw 13 being swivelled to the barrel 10e, it is apparent that further. turning of the hand wheel 1Sb to the right will cause the nut 2O to move further inward on theV threaded portion 18d4 thereof, the spindle 12 bearing against the work. It is obvious that the -nut 20 will now leave its enclosing sleeve 24 and willmove inward compressing` the spring 22, causing it to exert adjustably increasing tension against the spindle 12 and work 14?. kToremovethe work, it is merely necessary to turn' the hand wheeltoA the left andthe heavy spring 22 will adjustably decrease itstension' and permit. withdrawal of the spindle 12 and attached sleeve 24 in the barrel 10e, so that theV work may then be readily removed from thetront ot the now Vretracted dead center 13; It is obvious' that the' inward movement et thev spindle'12'is" limited by the' forwardly extending annular portion 24a' of the sleeve 24 contacting the shoulder10 on the inner periphery ot the barrel 106, the spindle 12 being attached to said sleeve 24 by the screws 25.

tension exerted by which may be accurately adjusted without moving the foot-stock on the table or taking it apart to vary the position of a nut on the spindle adjusting screw as in former types.

In addition, I have provided a toot-stock equipped with light spring tensioning means for holding` light work, the use of which is more particularly illustrated in Figs. 2 l

and 4. To bring said meansV into operative position, unlock the locking bolt 29 (Figsj 4 and) as explained, leaving the bushing 16, the enclosed spindle adjusting screw 18, the threadedly attached nut 20, the nut abbut-ting shouldered sleeve 24 and the attached spindle 12all free to slide axially in the bore 10e against the pressure of thel 12 and dead center 13 to the extreme outermost position thereof in the barrel 10e. The work 14b may then Vbe positioned in front of the dead center 13, and the handle 39'd gently released. The spring 34 will force the aforementioned'slidable attached parts inwards until the dead center 13 is properly Vpositioned against the light work 14'), the

spring 34 exerting suiiicient tension to hold the light work. The sliding parts will position and exert tension according to the position of `the foot-stock on the table 11 as in former types. To remove the work 14h, it is merely necessaryto pull down on'the handle 39a and the contacting parts will axially slide outward in the barrel 10e, as explained, withdrawing the dead center 13 from the work 14". After removing the work 14b gently release 'the' handle 39a, and thefcontacting parts will axially slide inwards" to Vtheir former rposition.v It is obvio-us that I have provided a toot-stock,

Yequipped with adjustable spring means Jfor holding all kinds of work. f Y

Itis understood that my inven-tion'is not limited to the specific embodiment shown,

land that-various. deviations `maybe made therefrom withoutdeparting'from the spirit andscope of the appended claims.

^ IVhat Iclaim as new and' desire to secure as Letters Patent is It is obvious thatv I have provided an inproved type of foot-stock, the4 llO ian

l. In a foot-stock,- in combination with a work-holding member axially slidable on the foot-stock body, adjustable heavy resilient means to actuate said member for exerting comparatively heavy pressure when holding heaiwv work, and light resilient means to actuate said member for exerting comparatively light pressurewwhen holding light work.

2. In a toot-stock, in combination with a work-holding member axially slidable on the foot-stock body, heavy resilient means to actuate said member for exerting comparatively heavy pressure when holding heavy Work, and light resilient means to actuate said member for exerting comparatively light pressure when holding-light work.

3. In a foot-stock, in combination with a work-holdingmember axially slidable on the foot-stock body, adjustable heavy resilient means to actuate said member, light resilient means to actuate` said member, and means to vary thepressure exerted by both said resilient means from the comparative-ly light pressure exerted by the light resilient means when in a substantially distended position to the comparatively heavy pressure exerted by the heavy resilient means when in a substantially contractedl position.

` 4. In a foot-stock, in combination with a work-holding member axially slidable on the foot-stock body, heavy resilient means to actuate said member, light Yresilient means to actuate said member, and means to vary the pressure exerted by both said resilient means from the comparatively light pressure exerted by the light resilient means when in a substantially distended position to the comparatively heavy pressure exerted by the heavy resilient means when in a substantially contracted position,

5. In a Jfoot-stock, the combination of a work-holding member axially slidable on the foot-stock body, adjustable heavy resilient means seated in said body adapted to exert comparatively heavy pressure againstl said member when holding heavy work, light resilient means seated in said body adapted to exert comparatively7 light pressure against said member when holding light work, and means to shift either the light or heavyT resilient means as desired into operative action againstsaid member.

6, In a foot-stock, the combination of a work-holding member axially slidable on the foot-stock body, heavy resilient means sea-ted in said body adapted to exert comparatively heavy pressure against said member when holding heavy work, light resilient means seated in saidY body adapted to exert comparatively light pressure `against said member when holding light work, and means to shift either the light or heavy resilient means as desired into operative action against said member.

7. In a Jfoot-stock, the combination of a center holding spindle axially slidable on the foot-stock body, a spindle adjusting screw seated in said body, a nut travelling on said screw, heavy resilient means contacting` said spindle and nut adjustable on turning of the screw and resultant axial movement of the nut, a sleeve attached to said spindle, light resilient means seated in said body and contacting said sleeve, and means effective to shift said spindle, screw, sleeve and nut to permit the light or heavy resilient means as desired to bear against said spindle and work.

8. ln a foot-stock, the combination of a center-holding spindle axially slidable on the foot-stock body, a `spindle adjusting screw seated in said body, a nut travelling on said screw, heavy resilient means contacting said spindle and nut adjustable on turn'- ing of the screw and resultant axial movement of the nut, light resilient means seated in said body and contacting said spindle, and means effective to shift said spindle, screw and nut, to permit the light or heavy resilient means as desired to bear against said spindle and work.

9 In a foot-stock, the combination of a work-holding member axially slidable on the toot-stock body, and adjustable resilient means for exerting pressure against said member to hold the work, comprising spring members of ditl'ercnt resiliency and means to cause said spring members to exert their pressure successively.

l0. ln a foot-stock, the combination of a work-holding member axially slidable on. the foot-stock body, and resilient means Jr'or exerting pressure against said member to hold the work. comprising spring members ot different resiliency and means to cause said spring members to exert their pressure successively.

1l. In a foot-stock, in combination, a footstoclr body having a hollow barrel, a spindle axially slidable Within` said barrel and splined thereto having an inner end hollowed out to seat a work holding dead center and a chambered outer end, a bushing slidable in the outer end of said barrel` a spindle adjusting screw revolubly seated in and slidable with said bushing having a threaded portion extending into the chambered outer end ol the spindle and a hand wheel at its outer end, a nut travelling on said spindle adjusting screw internally threaded to co-act with the threaded portion of said screw, a heavy spring coiled around the threaded portion of said screw and seated between the inner end of the 'chambered portion of said spindle and said nut, a sleeve surrounding said nut in said 'hollow barrel having a forwardly projecting annular portion keyed to the outer end of the spindle and adapted to contact a shoulder on Athe lil) lUU

foot-stock barrel to limit the inward movementl of the said spindle forming an annular shoulder on its inner periphery to contact an annular shoulder on the nut to limit the outward movement ot said nut, means comprising a locking bolt resiliently seated in said barrel adapted to register in a hole in the bushing, to lock the slidable bushing to said barrel whereby turning of the screw hand wheel will move the nut inwards to compress the heavy spring to exert greater inward` pressure' on the work-holding spindle, a light spring seated against an end plate attached to the outer end of the barrel and adapted to contact the slidable sleeve and spindle keyed thereto, and `means comprising a lever mounted onsaid foot-stock body the work arm thereof projecting into a slot in said bushing adapted when the slidable bushing is unlocked to shift over in said barrel said bushing, enclosed screw, nut, sleeve and spindle to permit the light spring to exert comparatively light pressure against said sleeve, spindle and work.

l2. In a foot-stock, in combination, a ootstock body having a hollow barrel, a spin-' dle axially slidable within said barrel and having an inner end hollowed out to seat a work-holding dead center and a chambered outer end, a bushing slidable in the outer end ot' said barrel, a spindle adjusting screw revolubly seated in and slidable with said bushing and having a threaded portion extending into the chambered outer end of the spindle and a hand wheel at its outer end, a nut travelling on said spindle adjusting screw internally threaded to coact with the threaded portion of said screw, a heavy spring coiled around the threaded portion of said screw and seated between said slidable spindle and nut, means to lock the slidable bushing to said barrel whereby turning of the screw hand wheel will move the nut inwards to compress the heavy spring to exert greater inward pressure on the work-holding spindle, a light spring seated against the base ot the barrel anu adapted to contact the spindle, and means adapted when the slidable bushing is unlocked from said barrel to shift over said bushing, enclosed screw, nut and spindle to permit the light spring to exert comparatively light pressure against said spindle and work.

13. In a foot-stock, in combination, a footstock body having a hollow barrel, the inner periphery of which is provided with an annular shoulder approximately mid-way, a spindle slidable within said barrel and splined thereto having an inner end hollowed out to seat a work-holding dead center and a chambered outer end having an annular shoulder raised on the outer periphery thereof to contact said annular shoulder on the barrel to limit the inward movement of said spindle,` a spindle adjusting screw revolubly seated in said barrel having a threaded portion extending into the chambered outer end of the spindle and a hand wheel at its outer end, a nut travelling on said spindle adjusting screw internally threaded to co-act with the threaded portion of said screw, a spring coiled around said threaded portion of said screw and seated between the inner end of the chambered portion of said slidable spindle and said nut, whereby turning of the hand wheel may compress the spring to adjustably vary the tension exerted by said work-holding spindle.

14. In a foot-stock, in combination, a footstock body having a hollow barrel, a spindle slidable in said barrel having an inner end hollowed out to seat a work-holding dead center and a chambered outer end, a spindle adjusting screw revolubly seated in said barrel having a threaded portion extending into the chambered outer end of the spindle and a hand wheel at its outer end, a nut travelling on said spindle adjusting screw internally threaded to co-act with the threaded portion of said screw, and a spring coiled around the threaded portion of said screw and seated between said slidable spindle and said nut whereby turning of the hand wheel may compress the spring to adjustably vary the tension exerted by said work-holding spindle.

In testimony whereof I aifix my signature.

HERBERT E. TOWNSEND.

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