US1369789A

US1369789A - Wheel-dresser

Info

Publication number: US1369789A
Application number: US316597A
Authority: US
Inventors: Dawson Fred
Original assignee: Lawrence & Hill Inc
Current assignee: Lawrence & Hill Inc
Priority date: 1919-05-16
Filing date: 1919-08-11
Publication date: 1921-03-01
Anticipated expiration: 1938-03-01

Description

F. DAWSON.

WHEEL DRESSER.

APPLICATION FILED AUG-11, 1919.

INVENTOR.

Fred Dawson. 4

3 SHEETS-SHEET l- Patented Mar. 1, 1921.

ATTORNEY.

F; DAWSON.

WHEEL DRESSER.

APPLICATION FILED AUG-H, 1919.

\ 369,78. Patehted Mar-1,1921.

3 SHEETS-SHEET 2.

I 4 l i I 72 -4 I J 1 I 3 1 l I I I 6) 1 win m a i l ll llfllldl INVEN TOR.

Ffeo/ Dawson A TTORNE Y.

F. DAWSON.

WHEEL DRESSER.

APPLICATION FILED AUG-H, 1919.

Patented Mar. 1, 1921.

3 SHEETSSHEET 3- A TTORN E Y.

UNITED STATES PATENT OFFICE.

FRED DAWSON, OF WATERTOWN, NEW YORK, ASSIGNOR TO' LAWRENCE & HILL, INC., WATERTOWN, NEW YORK, A. CORPORATION OF NEW YORK.

WHEEL-DRESSER.

Original application filed May 16, 1919, Serial No. 297,680. Divided and this application filed August I Specification of Letters Patent.

Patented Mar. 1, 1921.

11, 1919. Serial No. 316,597.

To all whom it may concern:-

' Be it known that I, FRED DAWSON, a citizen of the United States, residing at Watertown, in the county of J eilenson and State of New York, have invented certain new and I useful Improvements in Wheel-Dressers, of

grinder and is operated in part by the power which actuates the grinder, and which is adjustable for dressing abrading wheels of dif-" ferent diameters, either while the grinding operations are being effected, or during the intervals in which the thread grinders are idle. And a further object is to provide means for adjusting thev wheel dressing mechanism for truing-up abrading wheels while the latter are employed for grinding either right or left hand threads.

I attain these objects by the means set forth in the detailed description which follows, and as illustrated by the accompany ing drawings, in which--- t Figure 1 is a top-plan view of the complete device; showing the same in the act of grinding the threads of a gage.

ig. 2 is a vertical longitudinal section, taken on line 2-2 of Fig. 1; showing the means for adjusting the grinder for grinding right and left hand threads of different angles.

Fig. 3 is a front-side elevation; showing by full and dotted lines the operation of the wheel dresser.

Fig. 4 is a front-end elevation of the com plete device; showing by full and dotted lines the adjustable nature of the wheeldressing parts for dressing wheels of different diameters.

Fig. 5 is a horizontal section taken on line 5-5 of Fig. 3; showing the construction and means for adjusting the wheel dresser.

Fig. 6 is a reduced front side elevation of the combined device; showing a small wheel for grindin internal threads, and also showing the w eel dresser swung from well as right and left hand threads.

the operative to the release position for facilitating the grinding of internal threads without interference from saidparts.

Fig. 7 is a broken rear-end elevation; showing a scale by means of which the grinder is adjusted for'accurately' grinding threads .of different angles; also showing one of the bearings for the main grinding shaft, and the method of lubricating the same.

In the drawings, the base of the combined device comprises concentric

cylindrical parts

2 and 3, both of which are erforated centrally to receive a bolt 4, which is provided with a flange '4 at its lower end for attachment to the groove in the usual compound rest (not shown) commonly carried by lathes. The rear side of the base is extended and split, as at 2, and is provided with a bolt 3, by means of which the bolt 4.- is clamped and held from turning in the base. The bolt 4 is also provided with a nut 4 for making the device rigid with its support. The front side of the base is provided with a horizontal cross bar 5. The part 5 is integral with the base .2 which adjustably supports the grinding and wheel dressing mechanisms. v j

The body of the grinding mechanism comprises an elongated portion 6 which slidably bears against the bar 5 and is adjustably held j in place by bolts 7, which pass through slots 6' in the opposite ends of the part 6, and are threaded into the corresponding ends of the bar 5, the slots 6' are arc-shaped and when bolts 7 areloosened up the wheel grinding mechanism may be tilted vertically, as shown by the full and dotted lines in Fig. 2,

for grinding threads of different angles, as

The rear end of the portion 6 is provided with a scale 8 representing degrees which may be read in either direction from zero, the latter being shown in Fig. 7 to register with a single graduation 8' on the corresponding end of the bar 5. When the grinding mechanism. is adjusted so as to bring zero above the graduation 8, the mechanism may be employed for grinding right hand threads. When zero is moved downwardly from the graduation 8 the device will then grind left hand threads. The body of the grinder ex-' tends forwardly from the portion 6 and is provided with two similar arms 9 and. 9'

which are bored out axially to receive the main grinding shaft 10, the latter being supported in split bearings 10" and 10, which preferably taper in opposite dlrectlons, as shown by dotted lines in Figs. 1 and 3. Each of the bearings are split at their top sides and.

the shaft 10. The shaft 10 is driven by a sheave 13, which is made rigid to theshaft by means of screws 13, and the sheave is driven by a belt 13 (shown in dotted lines in Figs. 1 and 3), which may be driven by the line shafting which drives the lathe. 14 represents a dust cap which is screwed onto the arm 9 for protecting one end of the shaft 10, while 14 represents a similar perforated cap through which the shaft 10 passes and which is screwed onto the arm 9. The shaft 10 projects beyond the cap 14 and is reduced and threaded, as at 10, to

receivethe threaded end 15 of the abrading wheel holder 15, which supports the abrading wheels 16 and 16, the former being shown in Fig. 1 in the act of grinding the external threads 17 of a gage 17 The wheel 16 is employed for grinding internal threads. In practice the gages are mounted between the head and tail centers 18 and 18' of a lathe and the gage is driven at a suitable speed and in the proper direction by well-known connections with the head of the lathe. The grinding mechanism is preferably moved in the proper direction according to whether the threads are left hand or right hand, by the screw feeding mechanism of the lathe, which is well understood and does not need special description in the present case.

The wheel dressing mechanism comprises an arm 20, one end of which is split and pivoted by means of a screw 20, to an upwardly projecting tongue 21, which is preferably 1nte ral with "the body 6 of the grinder. T e tongue 21 preferably fills the slot 20 of the arm and has a reduced portion 21' which is received in a downwardly facing groove 20 in the arm 20 which alines with the slot 20*. The arm 20 is held rigidly in the operative position by a thumb-screw 22 which passes loosely through one of several holes 22 in'the arm' 20, and is then threaded into the reduced portion of the tongue 21. The several holes 22' are provided for rigidly securing the dressing mechanism when adjusted to different positions longitudinally for positioning said mechanism directly over the abrading wheels. At the same time the screw 20 may slanting screw 20' clear of the belt 13 The opposite end of the arm 20 is provided with an enlarged rectangular head 23, which is cut away at 23' at its bottom end, to provide clearance for the grinding wheel 16. The

front face of head 23 is provided with a vertical dove tail groove 23 in which is slidablydisposed a similar tongue, of a reciprocable bed or part 24 (see Fig.5), which supports the wheel dressing devices. The part 24 is bored out longitudinally and threaded to receive an adjusting screw 25 which is swiveled in a cap 23 of the head, the said screw being provided at its top end with a handknob 23, which is held in place by a screw 23. The wheel dressers comprise similar pencil-

like parts

26 and 26, which are adjustably disposed in socket-

holders

27 and 27, the latter being mounted upon

plates

28 and 28. The said plates are fitted with dove-tail tongues 29and 29, which are slidably disposed in similar grooves 30 and 30' formed in

blocks

31 and 31, the said blocks being suitably and rigidly secured to the bed 24 by screws 32. The blocks 31 and 31' are mounted on the bed 24 at substantially 60 angles to the vertical center of the head 23 and the bed 24, and the dressing parts 26 are positioned at right angles to the longitudinal axes of said blocks so that when said dressers are moved upwardly and downwardly their points 26", which are preferably diamonds, travel in lines parallel to the oppositely beveled grinding edges of the abrading wheels, for dressing said wheels.

The dressing pencils are recipro'cated in the

blocks

31 and 31 by means of

rods

33 and 33 which are pivoted at one end of the plates 28 by screws 33 The opposite ends of said rods are pivoted to a cross arm 34' of a lever 34 by a screw 33". The lever 34 is pivoted to the bed 24 by a screw 34*. The rocking of lever 34 toward the right and toward the left, alternately moves the

dressers

26 and 26 back and forth over the bevel cutting edges of the wheels 16 and 16',

ployed for grinding internal as well as external threads. (See parts 16 and 16). The provision of the novel and simple adjustable wheel dresser, which is combined with the thread grinders and which may be operated simultaneously with the grinding mechanism, effects a great saving of time because the wheels may be accurately and readily dressed without interference with or from the grinding parts.

Obviously, some changes or modifications may be made in the parts of the device within the scope defined by the appended claims without departing from the spirit of my invention.

This application is filed as a division of my pending application, Serial No. 297,680, filed May 16th, 1919.

Having thus described my invention, what I claim, is-

1. The combination with a body, of a wheel dressing mechanism comprising an arm pivoted to said body and having a head, a plurality of wheel dressers adjustably mounted on said head adapted to straddle an abrading wheel, means for adjusting said arm longitudinally, and a rocking lever adapted to alternately bring said dressers into operative contact with the opposite sides of said abrading wheel.

2. The combination with a body,- of a wheel dressing mechanism comprising an arm pivoted to said body and having a head, a bed movable on said head, a plurality of wheel dressers operatively mounted on said bed, means for reciprocating said bed for moving said dressers toward and away from abrading wheels of different diameters, means for rotating said arm and said head in a vertical plane and a rocking lever adapted to alternately bring said dressers into operative contact with the opposite sides of said abrading wheels.

3. The combination with a base, of a body adjustably mounted on said base, a wheel dressing mechanism comprising a head having an arm pivotally and adjustably mounted on said body, an adjusting screw carried by said head, a bed slidable on said head and reciprocated by said screw, a pair of wheel dressers adjustably mounted on said bed, and a rocking lever pivoted to said bed adapted to alternately bring said wheel dressers into engagement with the cutting surfaces of said abrading wheel.

4. In a wheel dresser, the combination with a base, of a body adjustably supported by said base, a wheel dressing mechanism comprising an arm pivoted to said body and having a grooved head, aplurality of dressing pencils, a holder for each of said pencils, a bed for supporting said holders, means for adjusting said holders for bringing said pencils into position for dressing abrading wheels of different diameters, and means for alternately bringing the points of said pencils into dressing contact with the opposite cutting surfaces of said abrading wheels.

5.;A wheel dressing mechanism comprising an arm pivoted for movement toward and away from an abrading wheel, in a vertical plane, a bed slidably mounted on said arm and movable in a vertical plane, a pair of wheel dressers adjustably supported by said bed, and means for alternately bringing said dressers into abrading contact with the opposite edges of the abrading wheel.

6. The combination with a base, of a body tiltable on said base, a wheel dressing mechanism comprising an arm pivoted at one end to and tiltable with said body, the opposite end of said arm having a head, the latter being cut away to receive an abrading wheel, wheel dressers adjustably mounted on said head and movable in a vertical plane, and a rocking lever for alternately moving said dressers toward and away from the cut-away portion of said head. i

7. The combination with a vertically movable body, of a wheel dressing mechanism comprising an arm pivoted at one end to said body and movable therewith, the opposite end of said arm provided with a head which is slotted to' straddle an abrading wheel, a bed slidably mounted on said head and having a slot registering with the slot in said head, a pair of wheel dressers supported by said bed at the opposite sides of said slots and alternately movable toward and away from said slots, and a rocking lever for operating said dressers.

In testimony whereof I aflix my signature.

FRED DAWSON.