US401677A - Belt-tightener for planing-machines - Google Patents

Description

2 Sheets-Sheet E. F. AUTENRIETH. BELT TIGHTENER FOR PLANING MACHINES.

a .(No Model.)

No. 401,677. Patented'Apr. 16, 1889.,

' 2 Sheets-Sheet 2.

(No Model.)

E. P. AUTENRIETH BELT TIGHTBNER FOR PLANING MACHINES.

N0. 401,677. Patented Apr. 16, 1889'.

UNITED STATES PATENT OFFICE.

ERNST F. AUTENRIETH, OF NEWV YORK, ASSIGNOR TO THE GLEN COVE MACHINE COMPANY, (LIMITED) OF BROOKLYN, NEW YORK.

BELT-TIGHTENER FOR PLANlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 4=Ol,677, dated April 16, 1889.

Application filed January 28, 1889, Serial No. 297,749. (No model.)

To all whom, it may concern/.-

Be it known that I, ERNST F. AUTENRIETH, of New York, in the county and State of New York, have invented a certain new and useful Improvement in Belt-Tighteners for Planing- Machines, of which the following is a specification.

My improvement relates to planing-1n achines, and particularly to that part thereof embracing the driving mechanism.

I will describe in detail a planing-machine embodying my improvement, and then point out the novel features in claims.

In the accompanying drawings, Figure 1 is a side elevation of such parts of a planingmachine as are essential to an understanding of my improvement. Fig. 2 is a plan or top View of the same. Fig. 3 is a sectional elevation, on an enlarged scale, looking in the direction of the arrow, Fig. 1, and taken on the line 00 x of said figure. Fig. a is a detail, on an enlarged scale and partly in section, of certain parts, Fig. 5 is a View illustrating a modification.

Similar letters of reference designate corresponding parts in all the figures.

A designates a portion of the frame of the machine.

B designates a main or driving shaft, and B a main or driving pulley mounted thereon.

In Fig. 1 I have shown in dotted outline a belt, a, passing over the driving-pulley B and an idler-pulley, B and from thence to a pulley, B on a cutter-head shaft, 1), upon which is mounted a cutter-head B.

B I? represent presser-rolls driven bygearing or in any other suitable manner, but which, as they do not form part of my invention, I will not further describe.

Upon the driving-shaft B, outside the pulley B, is mounted a pulley, O.

O designates an expansion-pulley. The expansion-pulley 0 comprises a frame, 0 of circular form. The frame C is provided with tangentially-extending slots 0 of which I have shown four. These slots form guideways for segments 0 of the expansion-pulley proper. The segments 0 are adapted to be moved nearer to or farther from the axis of the pulley along said guideways. The outer edges of the segments C are arc-shaped, and

are grooved to receive a belt, G, passing through said grooves and about the pulley Q. The inner ends of the segments 0 have pivotally connected to them links or rods d. These links or rods extend rearwardly from the expansion-pulley approximately in line with the direction of movement of the seg ments 0', or, in other words, tangential to the axis of rotation of the pulley; At their outer ends the links or rods are pivotally connected to a collar, E, which collar rotates with the shaft H, upon which the pulley is mounted,

its rotation being due to a feather, d, on the shaft, which enters a suitable groove in the collar. The said collar has a circumferential groove, E, and a yoke, F, is received within said groove. This yoke forms one arm of a" bell-crank lever, F, fulcrumed upon a suitable support extending from the frame of the machine. Pivotally connected to the other arm of the bell-crank lever is a rod, H. The rod H, near its other end, is pivotally connected to a lever, H constituting a shifting device, fulcrumed upon the frame A. The 7 5 upper portion of the lever H is provided with an arc-shaped slot, e, through which extends a screw-threaded pin or stud, e. A nut, 6 engaging said pin or stud, may be employed to lock the lever H in any position into which it may be rocked. By swinging the lever H in one direction or the other the segments of the expansion-pulley may be moved nearer to or farther from each other, thus increasing or decreasing the diameter of the pulley. hen 8 5 it is desired to slow down, the diameter of the pulley will be increased. When it is desired to speed up, the diameter of the pulley will be decreased.

Of course varying the diameter of the pulo ley will cause variations in the tension of the belt G. In order to compensate for these variations, I employ a belt-tightener. This belttightener comprises pulleys g g, mounted upon arms g g, which arms extend from a hub, 9 secured upon a rock-shaft, 9 which latter is journaled in the frame of the ma chine. Mounted upon said rock-shaft, and extending upwardly therefrom, is a lever, I. The upper portion of this lever terminates in I00 a handle. The lower portion is bifurcated, and the shaft 9 passes loosely through apertures in said bifurcations. Between the bifurcations, and rigidly secured to the shaft g is a worm-wheel, I. WVith this wor1n-wheel engages a worm, I journaled in portions f of the lever I, between the bifurcations thereof. Upon the shaft of the worm I outside the portions f of the lever, is a hand-wheel, I The belt G in this example passes under the pulley g and over the pulley When it is desired to slacken or tighten the belt, the lever I is rocked in the proper direction for that purpose. If considerable slack is to be taken up, more, in fact, than could be taken up by the rocking of the lever I, (which might occur when the diameter of the expansion-pulley had been very much reduced,) the hand-wheel I may first be manipulated to occasion the rocking of the rock-shaft g and consequently the shifting of the pulleys g g to a desired extent, and then the lever I may be manipulated to tighten the belt to as great a degree as may be desired. Of course a similar operation may be performed where it is desired to occasion more slack in the belt than could be given through the movement of the lever I.

I employ astop for automatically retaining the lever in a position into which it has once been adjusted. This stop con sists'of a cam, J, mounted upon a pin or stud extending from the lever I and provided with a handle, J. The handle J operates as a weight to maintain the cam in operative position.

J designates an arc-shaped piece secured near its ends upon the upper side of the frame A, and passing about and in close proximity to the cam J. If said locking-piece occupies a position shown in Fig. 1, the lever I may be then moved freely toward the right of Fig. 1, and its return movement will be effectively prevented by the action of the cam J upon the arc-shaped piece J and it will not be necessary to use the hand for occasioning this locking, as it will occur automatically. When it is desired to move the lever in the other direction, however, the handle J must be operated by hand to release the cam. If the handle be swung over on the other side, and the lever I be passed by the center or past the position shown in Fig. 1 and'toward the left thereof, the cam will then operate automatically to prevent the movement of the lever in the other direction.

In Fig. 5 I have shown that a sliding bar, L, may be pivotally connected to the upper end of the lever I and slid through a guidepulley by hand to a desired extent, and

means for locking the same in such position I after it has been so adjusted. At the same time I provide means for accurately tightening the belt, combining two movements operating through one mechanism, whereby avery accurate and perfect tightening of the belt is accomplished. At the same time I provide means for automatically locking the belttightener when it has been adjusted.

Although I have shown the cam J as mounted upon the lever and the pieces J 2 mounted upon the frame, it is obvious that these positions might be reversed.

WVhat I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, with pulleys, of a belt passing about said pulleys, a belt-tightener, a rock-shaft upon which said belt-tightener is mounted, a worm-wheel on said rock-shaft, a worm engaging said worm-wheel, and a lever mounted upon the rock-shaft in which said worm is journaled, substantially as and for the purpose specified.

2. The combination, with pulleys, of a belt passing about said pulleys, a belt-tightener, a rock-shaft upon which said belt-tightener is mounted, a lever for operating said rock-shaft, and a main frame, said main frame and lever, the one being provided with a binding-surface and the other with a cam, constituting a lock adapted to bear upon said binding-surface to lock the lever in a position into which it has been adjusted, substantially as specified.

3. The combination, with pulleys, of a belt passed about said pulleys, a belt-tightener, a rock-shaft upon which said belt-tightener is mounted, alever for operating said rock-shaft, and a main frame, said main frame and lever, the one being provided with a binding-surface and the other with a weighted cam adapted to bear upon said binding-surface to automatically lock the lever in a position into which it has been adjusted, substantially as specified.

ERNST F. AUTENRIETH. Witnesses:

FREDK. HAYNES, ARTHUR H. GAMBLIN.

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