US731871A

US731871A - Friction indexing mechanism.

Info

Publication number: US731871A
Application number: US135793A
Authority: US
Inventors: Francis G Echols
Original assignee: Pratt and Whitney Co Inc
Current assignee: Pratt and Whitney Co Inc
Priority date: 1902-08-25
Filing date: 1902-12-18
Publication date: 1903-06-23
Anticipated expiration: 1920-06-23

Description

, PATENTBD JUNBZS, 190|3.`

" F. G. BcHoLs.

FRIGTION INDEXING MBGHANISM.

APPLICATION FILED DB. 18, 1902.

2 SHEETS-SHEET 2.

N0 MODEL.

AN//q 6 No.731,s71. Patenteazruneaa 1903.

,WUNITED `STATES NPATENT OFFICE.

FRANCIS G. ECHOLS, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT du WHITNEY COMPANY, OFIIARTEORD, CONNECTICUT, A CORPORATION or NEwJERsEY;

FRICTEION INDEXING MECHANISM.

SPECIFICATION formingpaa of Letters Patent No. 731,871, dated June 23, 1903.

i Original application filed August 2,5, 1902.*Serinl1lo. 120.953. Divided and this application filed DecemherlS, 1902. Serial p No. 135,793. (No model.) i

` t To all whom it may concern: I Like numerals designate similar parts Beit known that I, FRANCISG. ECHOLS, a throughout the severalviews. s0 r citizen of the United States, residing atAHart Referring to the drawings, the numeral 1 fordinthe county of Hartford and State of designates a table which so far as the inven- 5 Connecticut, have invented certain new and tion is concerned may be either reciprocatory `useful Improvements in Friction Mechanism, or stationary and carries a head-stock 2 and ofiwhich the following is a specification. a tail-stock 3, each provided with centers 4 5 5 My invention relates tofriction mechanand 5, respectively, as illustrated in Fig. `1, `isnnandis shown employed forindexingpur-` said centers acting as supports for work 6, Io@poses,althoughinsome of its details it isnot shown as a reamer-blankinsaid iigure. restricted to such use; and it has for its object Mounted in a bearing of the head-stock 2 is 4the provision offrictional devices of peculiar a tubular shaft 7, having at one enda head 8 6o Y construction located between an article to be and at its opposite extremity a piston-chamrotated `and means for` actuating said fricber 9, the latter being provided with a cover I5tionaldeyiceswherebya yielding or slipping 10, having a curved slot -12 for a purpose connection isprovided which will prevent inhereinafter described. Within this shaft 7 `@jury in case ,of resistance` to the movement is a shaft 13, Carrying at one end a slotted 65 i of thearticle and willalso permitthe saidarcrank 14 and at its other end a pistonl, havticle to be ,moved too far and then returned ingawing 16 projecting from its hub, as illus- 2o to theexact position required for correctin trated in Fig. 11. Located in the pisto` dexing; purposes.` `chamber is an abutment 17, having a port 18 p A further object of the invention is the proleading to a nipple 19, the latter commingling ,7o visionof friction-disks held in a chambered with a pipe 20, leading to a source of fluid- `carrier and of means for actuating` said carpressure. (Not shown.) Threaded into the 1 25 rier and for connecting one of the disks with Wall of the piston-chamber is a screw 21, on

the device to be actuated. i which is jam-nut 22, said screw serving as an In theaccompanying drawings, Figure 1 is adjustable stop for limiting the stroke of the 75 a sideelevationof a table and my improved piston', and hence controlling the movement friction mechanism in place on a head there` of the shaft to which it is attached, as will 3o of. Fig. 2 `is a horizontal sectiontaken on `be hereinafter explained.

linerwof Fig..1. Fig. 3isa`perspective View Projecting from the wing 16 and passing of my improvement and of part of thehead i through the curved slot`12 in the cover'lO of 8o carryingthe same. Fig. 4 is a front eleva"` the piston-chamber is a pin or stud 24, to tion` of aguideway, showing a crank'for `which is connected one end of a spring 25, .g5-.actuating `the friction devices. Fig. 5 is a whoseother extremity is attached to an arm perspective view Of a sleeve hereinafter de- 26, adjustably secured to a bracket 27 on the i scribed. Fig. Gis" a face view of one of the yexterior of said piston-chamber. This pin or 85 i friction-disks. Fig. 7 is a perspective View stud passes through a rocking plate 28, se- Of a slide carrying a `center on which the cured to the cover by a rivet 29 or otherwise, 4o s leeveshown in Fig. 5 is mounted. Fig. 3 is said plate fitting in a recess of the cover and aface View of the chambered carrier in which serving to prevent leakage of fluid through the frictiou-disksare mounted. Fig. 9 is an the slot 23. `4 9o endview of said garrier, illustrating a means Fitted in a guideway of head 8 is a slide 30, whichkmay be employed for connecting the having a curved slot 31. This head is also 45 outer friction-disk with the article to be ac,` recessed or out away, as at 32, to afford room tuated. y Fig. 10` is a faceiview of the cover for the sweep of the crank- `14, as shown in to the piston-chamber, and Fig. 11 is a verti- Fig. 4. Projecting from said ,slide 30 is a 95 cal section through said piston-chamber. center 33, notched at 33' for arpurpose hereinafter mentioned, and loosely mounted on this center is a sleeve 34, exteriorly threaded iol at 34 and having a iiange 342, carrying a Wrist-pin 35, the latter passing through the slot 3l of the slide and entering the slot of crank l4. (See Fig. 2.) Threaded upon the rier being provided with clutch-pins 363 and with a series of recesses 362 for the reception of springs 38, as illustrated in Figs. 2 and 8. Located within the flange or cup of the carrier are friction-

disks

39 and 40, preferably provided with raceways 41, in which are placed balls or rollers 42, although these balls and raceways may be omitted, if desired, each of these disksloosely surrounding the sleeve 34, and the disk 39, having holes 39' for the reception of the pins 363, projecting from the base-of the carrier. A nut 43, threaded upon the sleeve, serves to force the disk against the disk 39 with the necessary .degree of pressure, and a washer 44, sprung 2'5 into the notches 33 of the center 33, prevents endwise movement of the sleeve 34 upon said center. Carried by disk 40 is a fork 45 for the reception of the arm of a lathe-dog 46, (shown employed to connect said disk with the work or other article 6 to be indexed.) In the tail-stock the center is carried by a slide 47, and for adjusting the slides 30 and 47 to vary the positions of the centers screws 48 and Vernier-stops 49 may be employed, as shown in Figs. 1, 3, and 4. Dust-excluding packing 50 is seated in a recess in the base of the carrier 36 and bears against the flange of the crank-sleeve 34, as shown in Fig. 2, and a resilient orother stop 51 may be provided to insure correct indexing.

In the operation of my invention the friction-disk 40 is connected in any desired manner with the device to be indexed. Fluid, such as compressed air, is then introduced to the piston-chamber 9 by means of the pipe 20, and the pressure of said Iiuid forces the piston 15 around in the chamber until the wing 16 comes into contact with the adjustable stop 21,which, as above stated,regulates the extent of its movement. As has been before set forth, the hub ofthe piston is keyed to the shaft 13, and as such piston is rocked or oscillated the shaft will of course turn with it, thereby causing the crank to actuate the wrist-pin 35 projecting from the flanged head 342 of the sleeve 34. As this sleeve is rocked by the means described the cup-shaped carrier 36 moves with it and the disk 40, which is connected with the device to be actuated, also moves bodily with the cup and its companion disk 39, and thereby imparts movement to the device With which it is connected. As the piston and its shaft are rocked or oscillated the spring connected to the stud 24 projecting from the Wing 16 of said piston is distended, and after the supply of motive fluid has been cnt off from the pipe 20 this spring Will-return the parts to normal position, and should the device'have been turned too far the spring in thus returning the parts will cause the article to be broughtagainst the stop or resistance element 51, which may be employed for determiningits proper position. When this is done, the disk 40 will of course be held stationary/by the stop, and the carrier and disk 39 will have a slipping movement thereon or on the interposed balls. These balls prevent excessive friction b etween the

disks

39 and 40, and yet permit a sucient pressure or frictional engagement of said balls and disks to enable the carrier and said disks to rotate the device with which one of them is connected, the disk 40 being held stationary by the stop 51 in contact with said device, and the other disk 39 having a slipping movement when,` the piston-shaft is returned tonormal position and the piston 15 is forced against the abutment 17 by the spring above mentioned.

No claim is herein made to the combination of the friction-disks and their carrier shown and described with the other parts of the particular machine illustrated, for such combination is set forth and claimed in my application filed August 25, 1902, Serial No. 120,953, of which the present case is a division nor is claim made to the peculiarities of the motor mechanism, elements of which are shown herein, said motor mechanism constitilting the subject-matter of my application filed December 18, 1902, Serial No. 135,794.

Changes may be made in the form and construction of lthe carrier and friction disks Without departure from the invention, and the invention is not limited to its employment with any specific machine, for, as is obvious, it may be used in other relations dierent from that shown and described.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination with a machine element comprising a chambered carrier and a pair of friction-disks mounted in said carrier, one of said disks being held against rotation and the other being oscillatory, of a device carried by one of the disks and adapted to connect it with means to be actuated.

f. 2. The combination, with an oscillatorycarrier, of a pair of friction elements supported on the carrier, and means connecting one of said elements with the device to be actuated.

3. The combination, with a rotatablecar-` rier, of friction-disks mounted on the carrier, each of said disks having a ball-raceway; balls located in said ball-raceways; and means for connecting one of the friction-disks with the device to be actuated.

4. The combination, with an oscillatory carrier, of friction-disks, one mounted for axial movement, and the other for rotary movement, with. relation to said carrier; means IOO IIO

for forcingone of said disks toward the other; and means for connecting one of the disks with an element to beactuated. i i

5. The combination, with a anged carrier,

oi' springs locatedon the base of the carrier;

a movable friction-disk receiving the pressure of the springs; means'for preventing said diskfrom rotating; a second friction-disk capable of rotary movement; and means for rotating said carrier.

6. A machine element comprising a flanged "carrier, springs seated in the base of the carrier; and a pair of friction-disks located Within the flange of the carrier, one of Said disks bearing against said springs, and being fixed against independent rotation, and the other of said disks being capable of rotary movement.

7; A machine element comprising a fianged carrier; friction-disks located in said carrier one of said disks being fixed against independent rotary movement, and the other being capable of such movement; springs for forcing one of said disks toward the other disk; and a driving-clamp carried by one of said disks.

8. The combinatiomwith a iianged carrier, 0f a pair of friction-disks located within the flange of said carrier, each of said disks having a ball-raceway; balls located in said raceways; and yielding means for forcing one of said disks toward the other.

9. A machine element comprising a Iianged carrier having recesses in its base, springs seated in said recesses; a perforated frictiondisk bearing against the springs and movable axially of the carrier; pins on the base of the carrier, and entering the perforations of said friction-disk; a second friction-disk in contact with the first disk, and `free to rotate in the carrier; and meansA for` rotating said carrier. f

In testimony whereof I aflix my signature in presence of two Witnesses.

"FRANCIS G. EOH'OLS.

Witnesses:

WILBUR W. LARKUM, LEWIS A. THURBER.