US1072059A - Crushing-mill. - Google Patents

Description

T. J'. STURTEVANT.

GRUSHING MILL.

APPLICATION FILED JULY9,1913.

11,072,059. Patented Sept. 2, 1913.

2 SHEETS-BEEBT 1.

T. J. STURTBVANT.

CRUSHING MILL.

APPLICATION FILED JULY 9, 1913.

1,072,059, Patented Sept. 2, 1913.

2 SHEETS-SHEBT 2.

N @Ho'onmdy UNITED STATES PATENT GFFICE.

THOMAS JOSEPH STURTEVANT, 0F WELLESLEY, MASSACHUSETTS, ASSIGNOR T0 STURTEVANT MILL COMYANY, A. CORPORATION 0F MAINE.

CRUSHING-MILL.

Specication of Letters Patent.

Patented Sept. 2, 1913.

Application filed July 9, 1913. Serial No. 778,211.

To all whom it may concern Be it known that I, THOMAS J. S'rUR'rE- vAN'r, a citizen of the United States, residinor at Vellesley, in the county of Norfolk and State of Massachusetts, have invented or discovered certain new and useful Improvements in Crushing-Mills, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to that class of crushing mills employing rotary beaters or hammers which coperate with gratos or crushing surfaces in the chambers of the mills.

In crushing mills of the class referred to most eflicient operation is secured by such an adjustment 0f the' beaters or hammers as will enable them to run closely adjacent to the gratos or crushing surfaces.` Owing, however, to the wear of the crushing parts, and more particularly to the wear on the rotary beaters or hammers, it is very desirable that a convenient radial adjustment of the working positions of the rotary beaters 0r hammersI should be provided for, to compensate for Wear, so that the adjustment may be quickly and readily effected, and the present invention has for its object to supply this desideratum.

In carrying the present invention into effect the rotary carrier for the rotary beaters or hammers preferably comprises two sets of heads or disks, the inner heads or disks being splined or otherwise secured to 'the crushing mill shaft, so as to rotate therewith, while the outer heads or disks are adapted to have a limited circular adjustment, with heads or disks, when the clamping bolts which normally secure these heads or disks together are loosened. The inner heads or disks are provided at .their peripheries with open radial slots for the reception of the pivot-bars of the rotary beaters, and the outer heads or disks, which overlap the ends of the said pivotbars, are provided with internal cam portions against which the outer faces of the said pivot-bars bear. Thus when the clamping bolts by which t-he two sets of heads or disks are normally rigidly secured together, are loosened a circular adjustment of the outer heads or disks relative to the inner fixed heads or disks will permit au in or out radial adjustment of the pivot-bars so as i reference to the; fixed to bring the rotary beaters in any desired -relation to the gratos or crushing surfaces 1n the chamber of the mill, such circular adjustment being permitted by slots in the inner heads or disks and through which slots said clamping bolts pass. The circular adjustment of the outer heads or disks, or the relative adjustment of said heads or disks, referred to, may be effected in different ways, as will hereinafter appear. In the accompanying drawings Figure 1 1s a diametric sectional elevation of the rotary arts of a rotary beater mill embodying one orm of the present invention. Fig. 2 is a section of the same, on line 2-2, Fig. 1. Figs. 3 and 4 are views similar to Figs. 1 and 2 respectively, showing a different form of the present invention from that illustrated in Figs. 1 and 2. Fig. 5 is a detail view of a part shown in Figs 8 and f1.

Referring first to Figs. 1 and 2 of the drawings, 12 denotes the rotary shaft of a crushing mill and to which shaft are splined or otherwise suitably fixed inner heads or disks 13 provided at their peripheries with radial slots 14 for the reception of pivotbars 15 on which are mounted thc swinging beaters or hammers 1G, herein shown as being U-shaped so as to constitute swinging bails. Mounted on the shaft 12 outside of the heads or disks 13 are the adjustable heads or disks 17 provided with a series of internal eccentric or cani surfaces 18 overlapping the ends of the pivot-bars 15 and against which the outer faces of the ends of said pivot-bars bear. The two sets of heads or disks 13 and 17 are securedv together in working position by means of clamping bolts 19 which fit closely in holes in the outer heads or disks, but pass loosely through curved slots 19 in the inner heads or disks. The inner heads or disks are held apart by a hollow cylindrical member 20 between the ends of which and the outer heads or disks 17 the inner heads or disks are clamped when the nuts 2l on the bolts 19 are tightened. Secured to the shaft 12 is a gear wheel 22 with which meshes a pinion 23 on one of the bolts 1S), said bolt being provided with a squared end 24 which is adapted to receive a wrench lby which the Said bolt may be turned when relatively fixed gear wheel 22 on the shaft 12 will cause a circular adjusting movement to be imparted to the outer heads or disks 17 for the purpose of changing the radial positions of the pivot-bars 15 and likewise changing the radial working positions of the swinging beaters 16.

In the construction shown in Figs. 3 and most of the parts, excepting the means for effecting the circular adjustment of the outer heads or disks relatively to the inner heads or disks, are similar to the corresponding parts in Figs. 1 and 2 just described, and are similarly designated by reference numerals. In this different form of the invention, however, the shaft 12 is provided with a straight longitudinal slot 25, and the inner cylindrical member 26 is provided with spiral slots 27 for the reception of the ends of a cross adjusting bar 28 movableV in said straight slot 25 and secured to a bar 29 longitudinally disposed in a portion of the shaft 12 which is made hollow for its reception. The 'longitudinal adjusting bar 29 is formed partly hollow and is screwthreaded internally for the reception of ascrew-threaded portion of anadjusting rod 30 which extends outward beyond the end of the shaft 12 where it is provided with a squared end portion 3l for the reception of a wrench by which it may be' turned. The adjusting rod 30 passes through a bushing 32 screwed into the end of the shaft 12 and the said rod is provided with an enlargement or boss 33 which abuts against said bushing to prevent endwise movement of said rod when it is turned. The adjusting rod may be fixed in any desired position by a lock nut 34: which will, of course, be loosened when the said rod is to be turned. The bolts 19, passing loosely through the slots 19 in the inner heads or disks 13, are encircled by spacing Washers or bushings 35 disposed in lsaid slots. These spacing washers or bushings are of suflicient length to prevent the fixed inner heads or disks from being clamped when the nuts 21 on the bolts 19 are tightened to secure the outer heads or disks to the flanges of the cylindrical adjusting member 26.

From the foregoing it will be understood that a circular adjustment of the outer heads 17 may be effected, for varying the working positions of the pivot-bars 15, by

turning the adjusting rod 30, thus causingthe adjusting bar 28 to travel in the straight slot 25 in the shaft 12 and the spiral curved slots 27 of the cylindrical member 26, thereby effecting a partial rotation of the said cylindrical member and a corresponding partial rotation of the outer heads or disks 17, any tendency to a turning movement of the adjusting bar 28 being resisted by the walls of the straight longitudinal slot 25 in the shaft 12.

The form of the invention last described offers the advantage of enabling the radlal adjustment of the pivot-bars, for effecting a radial adjustment of the working posi- I and described, nor to the feature of making the outer heads or disks adjustable relative to the inner heads or disks, as it will be understood that either set of these heads or disks might be made adjustable relative to the other set without' changing the result e'ected by a relative adjustment of these heads or disks.

Having thus described my invention I claim and desire to secure by Letters Patent l. In a crushing mill, the combination with a rotary shaft, of a 4rotary carrier comprising two sets of heads or disks one set of which is fixed to said shaft while the other set is capable of circular adjustment relative to said fixed set, one set of said fixed heads or disks being provided with open peripheral slots and the other set of said heads or disks being provided with eccentric or cam portions overlapping said open peripheral slots, pivot-bars mounted in said slots and retained in working positions by the said overlapping eccentric or cam portions, and swinging beaters carried by said pivot-bars.

2. In a crushing mill, the combination with a rotary shaft, of a rotary carrier comprising two sets of heads or disks one set of which is fixed to .said shaft while the other set is capable of circular `adjustmentrelative'to said fixed-set, one set of said fixed heads or disks being provided with open peripheral slots and the other set of said heads or disks being provided with eccentric or cam portions overlapping said open peripheral slots, pivot-bars mounted in said slots and retained in workingpositions by the said overlapping eccentric or cam portions, swinging beaters carried by said pivotbars, an inner cylindrical member, and clamping bolts. passing through portions of said member and said heads or disks.

3. In a crushing mill, the combination with a rotary shaft provided with a straight, longitudinalslot, of a rotary carrier comprising two sets of heads or dlsks one set of which is fixed to said shaft while the other set is capable of ,circular adjustment relative to said fixed set, one set of said fixed heads or disks being provided with open peripheral slots and the other set of Lovaoua said heads or disks being provided with eccentric or cam portions overlapping said open peripheral slots pivot-bars mounted in said slots and retalned in working positions by the said overlapping eccentric or cam portions, swinging beaters carried by Said pivot-bars, an inner cylindrical member provided with curved slots, clamping bolts passing through portions of said member and said heads or disks, a cross adjusting bar movable inv said straight and curved slots, and means for operatingr said cross adjusting `tar to cause it to travel in said slots, for efiectin a partial turning movement of the said adjustable heads or disks relative to said fixed heads or disks.

4. In a crushing mill,` the combination with a rotary shaft provided with a straight, longitudinal slot, of a rotary carrier comprising two sets of heads ordisks one set of which is fixed to said shaft while the other" set is capable of circular adjustment relative to said fixed set, one set of said fixed heads or disks being provided with eccentric or cam portions overlapping said open peripheral slots, pivot-bars mounted in said slots and retained in working positions by the said overlapping eccentric or cam portions, swinging beaters carried by said pivotbars, an inner cylindrical member provided with curved slots, clam ing bolts passin through portions of sai member and sai heads or disks, a cross adjustin bar movablein said straight and curve slots, and

means for operatin said cross adjustin bar to cause it to trave in said slots, for e ecting a partial turnin movement of said adjustable heads or dis relative to said fixed heads or disks, said operating means comprising a longitudinal adjusting bar to which said cross adjusting bar is attached, and which longitudinal bar is formed partly hollow and screw-threaded internally, and a rotatable adjusting rod having a screwthreaded portion engaging the screwthreaded j usting bar.

5. In a crushing mill, the combination with a rotary shaft, of a rotar carrier comprising two sets of heads or dlsks one set of which is fixed to said shaft while the other set is capable of circular adjustment relative to said fixed set, one set of said fixed heads or disks being provided with open peripheralslots and the other set of said heads or disks being provided with eccentric or cam portions overlapping said open peripheral slots, swinging beaters, and pivots for said swinging beaters, said pivotsA being mounted in said slots and retained in working positions by the said overlapping eccentric or cam portions.

In testimony whereof I aiix my signature, in presence of two witnesses.

THOMAS JOSEPH STURTEYANT. Witnesses:

L. H. STUn'rEvANT, W. V. Ennis.

portion of said longitudinal adn

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