US697852A - Work-rest for grinding-machines. - Google Patents

Description

No. 697,852. Pat'ented Apr. l5, I902.

A. B. LAND'IS. 7 WORK REST FOR GRINDING MACHINES.

(Application filed Sept. 7, 1901.)

(No Model.)

THE cams PETERS co, Puorom-ua. WASHINGYON, u. c,

Human STATES ATE T FFTCE.

ABRAHAM B. LANDIS, OF \VAYNESBORO, PENNSYLVANIA.

VVORK-REST FOR GRINDINGMMACHINES.

SPEGIFEQATIGN forming part of Letters Patent No. 697,852, dated. April 15, 1902. Application filed September '7, 1901. Serial No. 74,619. (No model.)

To all whmn it may concern:

Be it known that I, ABRAHAM B. LANDIS, a citizen of the United States, residing at lVaynesboro, in the county of Franklin and tate of Pennsylvania, have invented certain new and useful Improvements in Work-Rests for Grinding-Machines, of which the following is a specification.

My said invention consists in an improved construction of work-rests for grinding-machines of that general character shown in various patents heretofore granted to me, whereby the work may be held to the grinding-wheel under a yielding pressure adjusted to suit the Work being done or against a fixed rest, as desired, as will be hereinafter more fully described and claimed.

Referring to the accompanying drawings, which are made a part hereof and on which similar reference characters indicate similar parts, Figure 1 is a top or plan view of a work-rest of myimproved construction; Fig. 2, a side elevation, the frame being partly broken away to show the parts more clearly; and Fig. 3, a similar view to Fig. 2, illustrating modifications in the construction.

In said drawings the portions marked A represent the bed of the machine, B-the frame of the rest, and C the pivoted bar carrying the rest proper.

The machine-bed A, on which the rest is mounted, may be the bed of any machine of the character mentioned or with which such a rest may be used.

The frame B is of appropriate form to support the parts and is mounted on the bed in any approved manner. It is hollow, and its upper portion has parallel sides united at the rear and open at the end adjacent to the work.

The bar 0 is of any appropriate form, that shown being preferred, consisting of a substantially central portion of considerable cross-sectional area and reduced in size each side thereof, the front end being formed to support the rest-b1ock O and the rear portion to support a weight 0 mounted to slide thereon. Its central portion is bored out transversely and has a cylindrical plug (J therein, which plug is formed with a slot extending diagonally from the top near the rear toward the bottom and front, its parallelsides forming oblique surfaces. In said slot, just fitting between said parallel surfaces, is mounted a roller 0 formed with flanges c on its ends, which engage theouter ends of said plug and hold the two parts in fixed relation longitudinally. Said roller is inserted through the open lower side of the slot, which is then closed by a fillet 0 before the plug is put in place. Cone-shaped depressions are formed in the ends of said roller, in which cone-pointed bearings 0 adjustably mounted in the sides of the frame, engage. A sleeve 0 is mounted in a screw-threaded perforation in plug C the lower end extending into the oblique slot, and the outer end projecting through a segmental slot in bar (J. Said sleeve is interiorly screw-threaded, and a setscrew 0 is mounted therein, the end of which is adapted to project through to bear against the surface of roller O when desired, as will be presently described. A set-screw 0 projects through a screw-threaded perforation in bar 0 to impinge against the surface of plug (J and lock these parts in the desired relative positions,- which can be secured by turn ing said plug through the medium of sleeve 0 The object of turning or adjusting this plug is to vary the obliquity of the slot or surface moving on said pivot-roller for the purpose of changing the forward pressure of the rest without changing the upward pressure, which is done by sliding the weight on the bar. The forward end of bar 0 is pref erably formed with a plane face, with a flange having a tapered rear face i at the top. A sepa rate block 0, forming the rest-face, is preferably mounted (for convenience of chang ing sizes) on this end by means of a hook it, which is adapted to hook over said flange. On the top of said block 0 is mounted a spring clip or finger 0, consisting of a short flat bar, the point of which is adapted to rest on the top of the work and the rear portion of which rests in a notch in said block. A bolt 0 extends through the perforation in the frontend of bar 0, projecting below said bar, and has a coiled spring 0 thereon, interposed between said bar and a thumb-nut c on the screw-threaded lower end of said bolt. By this means the force with which said finger is held to the work may be regulated, as will be readily seen, while said finger may be lifted out of the notch in block 0 and swung out of the way when it is desired to take out or put in the work, as indicated by dotted lines in Fig. 1. The rear end of said bar 0 is of suitable form to support the weight G which is mounted to slide thereon. A setscrew 0 in said weight is adapted to impinge against the bar and hold said weight in any adjusted position. A set-screw b in frame B under the weight is adapted. to limit its downward movement. Another set-screw b in the frame adjacent to the work is adapted to clamp said weight rigidly between its point and a rib b on the inner face of the frame opposite when desired.

The operation is as follows: It being desired to support the work under a yielding pressure, the point of rest is adjusted against the work, the set-screws and I) being adjusted so that they will not bear against the roller (3 and weight 0 respectively. The weight is thus supported against said work, and the degree of pressure may be regulated as desired by adjusting it on the bar 0 to shorten or lengthen the leverage behind the pivot-points c". It will be seen that the rest is thus forced against the work not only in an upward direction by reason of its motion on pivots 0 but also in a horizontal or longitudinal direction by reason of its motion on the oblique surfaces of the slot in'plug C sliding downward over roller C and the pressure in the horizontal direction is varied by the change of angle of the oblique slot without changing the weight, as above described.

Thus as the work is ground away the rest will feed itself up to it to maintain a uniform I pressure at all times and will readily yield to irregularities, adjusting itself to all conditions. When the point of screw 0 is brought to restagainst the roller C the forward motion will be stopped, and when the weight C reaches the point of screw b the upward'mo- I tion will. be stopped, which with proper adj'ustment occurs when the work has been ground to the desired size. wears it can be adjusted to allow therefor by the screws 1) and 0 By the use of the clamping screw b the weight maybe clamped at any, period of the work and the rest made rigid if for any reason'desired. The finger C", as before stated, may be swung to one side out of the Way whenever work is to be removed from or placed in the machine or adjusted and serves to steady the work against vibration in a direction away from the rest and toward the wheel or to prevent chat tering, as it is termed.

Fig. 3 shows a modification, in which the bar 1 carrying the rest with its rear end provided with a series of notches, and a spring 2 substituted for the weight,'one end of said spring engaging with one of said notches, and the other end connected to a screw-threaded pin which extends through an aperture in a part of the frame and has athumb-screw 3 on its opposite end, by which it may be secured and the tension of the spring adjusted, as

As the bearing I well as by shifting the opposite end of said spring from one notch to another on the top of bar 1. A set-screw 4 is provided under the end of said bar for limiting its motion; otherwise the construction is the same as shown in the principal views and above described. The operation of the weight, however, is more satisfactory, as owing to its mass vibrations and chattering are impossible in its use as they occur in the use of the spring. These and other modifications in the details of construction may of course be made without departing from my invention as hereinafter pointed out in the claims.

Having thus fully described my invention, What I claim as new, and desire to secure b Letters Patent, is

1. In a work-rest for grinding-machines, the combination of a base or support, a bar pivoted between its ends at one side of the work provided with a work-engaging bearing on one end thereof and an adjustable weight at its other end.

2. In a Work-rest for grinding-machines, the combination of a base or support, a bar pivoted between its ends at one side of the work provided with a work-engaging bearing at one endthereof, and an adjustable stop controlling the elevation of said bearing.

3. In a work-rest for grinding-machines,

the combination of a base or support, a bar with a Work-engaging bearing at one end thereof, said bar pivoted on said base, an adjustable stop controlling the elevation of said bearing and an adjustable weight on the opposite side of the pivot in said bar from said work-engaging bearing.

. 4:. In a work-rest for grinding-machines, the combination of a base or support, and a pivoted bar with a work-engaging bearing at one end thereof, the pivot of saidbar engaging an oblique surface.

5. In a work-rest for grinding-machines, the combination of a bar having a Work-engaging bearing at one end thereof, an adjustable weight on the other end, and a central pivot engaging an adjustable oblique surface.

6. In a work-rest for grinding-machines, the combination of a bar having a work-engaging bearing, an adjustable weight, a pivot engaging an oblique surface, and an adjustable stop engaging said pivot.

7. In a work-rest for grinding-machines ICO gaging bearing, a pivot in said bar, said pivot I engaging an oblique surface, and a clip to engage the work.

10. In a work-rest for grinding-machines the combination of a pivoted bar, and a workengaging bearing mounted on the end thereof, said bearing having a hook by which it is supported to said bar.

11. In awork-rest for grinding-machines, a bar having a work-engaging bearing at one end, a pivot approximately at its center, an adjustable weight on the other end and means for clamping said bar rigidly when required. 12. In a work-rest for grinding-machines a base or support having a bar pivoted thereto, said bar having a work engaging bearing, said pivot engaging an oblique surface, an adjustable stop engaging said pivot, an adj ustable weight on said bar and a stop to control the upward position of said work-engaging bearing.

13. In a work-rest for grinding-machines, a base or support, having a bar. pivoted thereto, said bar having a work-engaging bearing, the pivot of said bar engaging an oblique surface, an adjustable stop engaging said pivot, an adjustable weight on said bar, a stop to control the upward motion of said work-engaging bearing, and a clip to engage the top of the work.

14. In a work-rest for grinding-machines, a base or support, having a bar pivoted thereto, said bar having a work-engaging bearing, said pivot engaging anoblique' surface, an adjustable weight on said bar, an adjustable stop engaging said pivot, a stop to control the upward motion of said work-engaging hearing and means for locking said bar in a rigid position when required.

15. In a work-rest for grinding-machines, a base or support formed like an open box having sides to which a bar is pivoted, said bar having a work-engaging bearing on one end, a weight on the other end of said bar, said parts being contained in said box which thus forms a protection to said bar so that its free action cannot be interfered with.

16. In a work-rest for grinding-machines, a base or support, a bar pivoted thereto, said bar having a work-engaging bearing, said pivot engaging an adjustable oblique surface,

an adjustable weight on said bar, an adj ust able stop engaging said pivot, an adjustable stop to control the upward motion of said work-engaging bearing, a clip to engage the top of the work and means for locking said bar in a rigid position when required.

17. In awork-rest for grinding-machines, a pivoted bar, a work-engaging bearing on one end thereof, a roller on said pivot engaging an oblique surface, and means for holding the bearing yieldingly tothe work attached to the other end of said bar.

18. In a work-rest for grinding-machines, the combination of a base or support, a pivotedbar with a work-engagin g hearing at one end thereof, the pivot engaging an oblique surface and an adjustable weight at the other end of said bar.

19. In a work-rest for grinding-machines the combination of a base or support,=a pivoted bar with a work-engaging bearing at one end thereof, the pivot engaging an adjustable oblique surface, and means for holding said bearing yieldingly in engagement with the Work.

20. In a work-rest for grinding-machines, the combination of a base or support, a bar with a work-engaging bearing, said bar pivotedon an oblique surface, a stop controlling the upward motion of said bearing, and means for holding said bar yieldingly in engagement with the work.

21. In a work-rest for grinding-machines, the combination of a base or support, a bar with .a work-engaging bearing, said bar being pivoted 011 an adjustable oblique surface, a stop controlling the upwardmotion of said bearing, and means for holding said bearing yieldingly in engagement with the work.

22. In a work-rest for grinding-machines, the combination of a base or support, a bar with a work-engaging bearing, said bar pivoted on an oblique surface, an adjustable stop engaging said pivot controlling the forward position of said bearing and means for holding saidbearing yieldingly in engagement with the work.

23. In a work-rest for grinding-machines,

the combination of abar with awork-engaging bearing, said bar beingpivoted on an ad-' j ustable oblique surface and adjustable stops engaging said pivot controlling the forward positionof saidbar, a stop controlling the upward position of said bearing, means for holding said bearing yieldingly in engagement with the work and a clip to engage the top of said Work.

24. 'In a work-rest for grinding-machines,

a pivot-bar with a work-engaging bearing, a

clip engaging the top of the work and a spring for holding said clip yieldingly tosaid work.

25. In a work-rest for grinding-machines, a work-engaging bearing, means for holding said bearing to the work, a clip engaging the top of the work, and aspring holding said clip yieldingly to said work.

26. In a work-rest for grinding-machines, a work-engaging bearing arranged with ahook as shown to attach to the end of a bar with means for holding said bearingyiel'dinglyin contact with the work, a clipfor engaging the top of the work and also the top of the bearing by which said bearing is held'in position.

27. Awork-restforgrinding-machinesc0111- prising a bar having a work-engaging bearing, said bar havinga slotted p1ug,'said slot forming an oblique surface which engages with the pivot in the support. 7

2S. Awork-rest for grinding-machines com prising a bar having a work-engaging'bearing, said'bar having a slotted plug, said slot forming an oblique surface which engages with the pivot in the support, said plug having apin by which it is turned to adjust the obliquity as desired, a screw for locking said plug and a screw-stop engaging the pivot passing through the pin.

29. AWork-rest for grinding-machines comprising a bar having a work-engaging hearing, said bar having a slotted plug, said slot forming an oblique surface which engages with a pivot formed with a roller, said roller having flanges at each end tohold the bar against side movement.

30. A work-rest for grinding-machines comprising a bar having a work-engaging hearing, said bar having a slotted plug, said slot forming an oblique surface, said surface bearing upon a pivot, said plug being adjustable in a rotary direction whereby the forward tension of the bearing against the work is adjusted, and an adjustable weight whereby the upward tension is adjusted.

31. A work-rest for grindingmachines, comprising a bar having a work-engaging bearing, said bar having a slotted plug, said slot forming an oblique surface, said surface bearing upon a pivot, said plug being adj ustable in a rotary direction whereby the forward tension of the bearing against the work is adjusted, and stops for limiting the movement of said bar.

32. A work-rest for grindingmachines, comprising a bar having a work-engaging bearing, said bar having a slotted plug forming an oblique surface, said surface bearing upon a pivot, said plug being adjustable in a rotary direction, whereby the forward tension of the bearing against the work is adjusted,

means by which the upward tension on the work is produced, stops for limiting the movement of said bar and a clamping-screw by which said bar is rigidly locked.

33. A work-rest for grinding-machines, comprising a bar pivoted and mounted to slide on an oblique surface which is adjustable as to pitch, substantially as set forth.

34:. A Work-rest for grinding-machines co mprising a bar pivoted and mounted to slide on an oblique surface under an adjustable pressure, substantially as set forth.

35. Awork-restforgrinding-machinescom prising a support provided with the Work-engaging bearing mounted to both pivot and slide toward the work under adjustable pressure, substantially as set forth.

36. In a work-rest for grinding-machines, the combination of the frame, the pivoted bar mounted therein, means forautomatically adjusting said bar toward the work, the workengaging bearing on said bar, and controlling-stops, substantially as set forth.

37. In a Work-rest for grinding-machines, the combination with the work-engaging bearing, of a yieldingly-mounted clip or finger arranged to engage the upper side of the work lightly, substantially as set forth.

In witness whereof I have hereunto set my hand and seal, at \Vaynesboro,Pennsylvania, this 26th day of August, A. D. 1901.

' V ABRAHAM B. LANDIS. [L. s.:|

Witnesses:

RUssELL MoWEN, ALF. N. RUSSELL.

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