US275224A - Steam-stamp for crushing ore - Google Patents

Description

(No Model.) 8 Sheets-Sheet 1.

E.D. LEAVITT, Jr.

STEAM STAMP POR @RUSHING ORB. No. 275,224. P nted Apr.3, 1883.

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Indenor:

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(No Model.) s sheets-sheet 2. E. D. LEAVITT, Jr. .STEAM STAMP FOR GRUSHING ORB.

,iPatentnd Apr. 3, 1883.

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Witnesses: W@ ma? N. PETERS. Pmivthxnhw. Washington.

(No Model.) Y 8 Sheets--Sheet 3. E. D. LEAVITT, Jr.

STEAM STAMP PGR GRUSHING ORE.4

No. 275,224. Patented Apr.3,1883.

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(No Model.) 8 Sheets-Sheet 4.

^ E. D. LEAVITT, Jr.

STEAM STAMP PDR GRUSHING ORE.

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E. D. LEAVITT, Jr.

lSTEAM STAMP POR GRUSHING ORE. v No. 275,224. Patented Apr.3,1883.

Wibwsses: Inventor:

N, PETERS, Puma-Limognphen wnmngcon. D. CA e (No Modem s sheets-sheen e. E. D. LEAVITT, Jr.

STEAM STAMP POR GRUSHING ORB.

N0. 275,224. Patented Ap1.3,1883.

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STEAM STAMP POR GRUSHING ORB.

No. 275,224. l

. Patented Apr. 3,1883.

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E. D. LEAVITT, Jr. STEAM STAMP PoR GRUSHING ORE.

Pahtenzxt-ed Apr. 3, 1883.

Witnesses: ffm@ (92 .Inventor y@ "y f 105%..

UNITED STATES PATENT OFFICE.

ERASMUS D. LEAVITT, JR., OF CAMBRIDGEPORT, MASSACHUSETTS.

STEAM-STAMP FOR CRUSHING ORE.

SPECIFICATION forming part of Letters Patent No. 275,224, dated April 3, 1883.

Application med .Tiny 12,1992.

To all whom it may concern Be it known that I, ERAsMUs D. LEAVITT, J r., of Cambridgeport, in the county ot Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Steam-Stamps for Crushing Ores, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to that class of orestamps in which the stamp or hammer is operated by the direct application of steam to the hammer-rod, or a piston or pistons secured thereto, and is an improvement upon the wellknown Ball stamp; and it consists, first, in the employment, asa means of operating the stamp or hammer, of dierential steam-cylinders and pistons arranged in axial line with each other, in combination with means of maintaining the maximum pressure beneath the smaller piston at a uniform standard, and

means of intermittently admitting steam to and exhaustingit from the chamber above the larger piston, as will be more fully described hereinafter.

It further consists in the combination ofthe smaller cylinder, a receiver having free communication with said cylinder, and an automatically-operating valve arranged to control the admission of steam to said receiver, and thus maintain the maximum pressure therein at a uniform standard.

1t further consists in a novel construction of the valve-gear, whereby the time of opening and closing the valves may be varied at will while the machine is in operation.

It further consists in the combination, with the dierential cylinders and pistons, of a dash-pot located beneath and adapted to receive one of said pistons, and cushion it at the lower end of its downward movement, as will be described.

It further consists in the combination, with the stamp-rod and means of reciprocating it, of a dash-pot as a means of limiting its upward movement and a dash-pot for limiting its downward movement.

It further consists in the combination, with a vertically-reciprocating stamp or hammer, a mortar or stamping-chamber, and a steamcylinder and piston adapted to operate said stamp or hammer, of a frame-work for sulp- (No model.)

portingthe steam-cylinder, made pyramidal in form and divided horizontally into three sections or stories, and having its upper section cast in one piece and its lower section made in two or more pieces, the whole being so united as to be self-supporting and independent of the structure of the building in which it is placed, and so that one portion ot' the lower section may be removed to permit the removal of the mortar without endangering the rest of the structure.

It further consists in the employment of a frictional clamping device applied to the valve-stem to prevent any undue movement of the valve.

It further consists in the combination ot' the large steam-cylinder provided with a jacketcasing cast therewith, but separated therefrom at one end, an annular expansion ring or plate connecting said jacket with the cylinder proper, and a smaller cylinder cast separate from and bolted to said larger cylinder in axial line therewith.

It further consists in a novel construction of the head ofthe lower orsmaller cylinder, whereby said head is made to serve the purpose of adash-pot to limit the downward movement 0f the piston of said cylinder.

It further consists in the combination of differential cylinders and pistons with means of maintaining a vacuum between said pistons, as will be more fullyvdescribd.

It further consists in certain details of construction and arrangement of the parts, which will be readily understood by reference to the description of the drawings, and to the claims to be hereinafter given.

Figure 1 of the drawings is a side elevation ot' my improved stamp with a portion of theframing in section. Fig. 2 is a sectional front elevation of the same. Fig. 3 is a front elevation of the steam-cylinders and the upper section of the frame, with the valve-gear mounted thereon, drawn to an enlarged scale. Fig. 4 is a sectional plan of the upper section of the frame, the cutting-plane being on line l l on Fig. 3. Fig. 5 is a horizontal section online 2 2 on Fig. 3. Fig. Gis a section of one corner of said upper section of the frame o'n line 3 3 on Fig. 3. Fig. 7 is a section on line 4 4 on Fig. 2. Fig. 8 is ahorizontal section of the framing on line 5 5 on Figs. 1 and 2. Fig. 9 is a central vertical section of the steam-cylinders on line -6 G on Fig. 10. Fig. 10 is a horizontal section on line 7 7 on Fig. 9. Fig. 11 is a. horizontal section on line 8 8 on Fig. 9. Fig. 12 is a partial vertical section on line 9 9 on Fig. 10, drawn to a still larger scale. Fig. 13 is a partial vertical section of the steam-cylinders, showing the manner of applying the expansion ring or plate, drawn to the same scale as Fig. 12. Fig. 14 is a vertical section of the valve-gear on line 10 10 on Fig. 3. Figs. 15, 16,17, 18, 19, and 20 are detail views of parts of the valve-gear, to be hereinafter referred to. Y

A A are two metal bed-sills resting upon and secured to a suitable foundation, of which the line t indicates the upper surface, and B B are a series of timbers resting at their ends upon said bed-sills, and together forminga table or platform to receive the metallic bed C' of the morta-r C.

D D are two hollow metallic .beams, arranged one upon each side of the wooden platform B B, and resting by their ends upon the bed-sills A A and firmly secured thereto by bolts orrivets. (Not shown.) Four hollow metallic columns, E E, are erected upon and secured to the upper surface of the Vbeams D D in inclined positions, so that each column forms one corner of the lower section ot' a pyramidal structure composed of three divisions or sections placed one above the other, and supporting at its top the steam-cylinders F and F', as shown.

The middle or central section ot' the pyramidal frame is composed of two side frames, G G, connected together by the tie-girts G' and G2, in which are formed the bearings For the stamp-shaft b, and provided at each end with flanges, by means of which and corresponding tianges upon the other sections, its lower end is firmly secured to the tops ot' the columns E, and its upper end is in like manner secured to the lower end of the upper section, H, which is cast entire in one piece, as shown in Figs. 3, 4, and 5.

The mortar proper, C, is made. circular in pian, and the die c, ring c', and lining c2 are all constructed and arranged substantially as in theBall stamp; but the upper part ofthe mortar or the screen-chamber G2 is made cruciform in plan, instead of rectangular, as is the Ball screen-chamber, the outer wall of each arm ot' the cruciform chamber being inclined, and provided with a perforated screen-plate d,th rough which the pulp or crushed ore is discharged into the hopper or trough e, one of which is applied to each of said inclined sides ot' the screen-chamber, as shown in Fig. 2.

l is the stamp or hammer, secured to the stamp-shaft b, and having secured thereto the shoe I' in a well-known manner.

Upon the top ofthe screen-chamber and surrounding the stamp-shaft b is an annular pipe, f, provided upon its inner periphery with a seriesof orifices and upon its upper side with two cone-like or funnel-shaped nozzles, through which water may be introduced into the Inortar through suitable pipes. (Not shown.)

The stamp-shaft b has its bearings in the tie-girts G' and G2, and has secured to its upper end the piston J, which, near the upper end of its upward stroke, enters the inverted dash-pot J', secured to the under side of the upper sect-ion ofthe pyramidal frame, by means ofwhich the upward stroke of the stamp and its stem is limited without serious shock to the machinery.

F is acylinder', open at both ends, and connected at or near its upper end by an annular ange or head with the inclosing-casing F,"

thereto, near its upper end, the casing F4,A

which is bolted by its lower end to the casing F2, and connected by the annular expansionplatef4 to the lower end of the'cylinder F', as shown in Figs. 2, 9, and 13.

K and K' are two pistons of different diameters, both mounted upon the piston-rod g, and fitted to and arranged to reciprocate in the cylinders F and F', respectively, said pistons being maintained at the proper distance apart by the sleeve g', interposed between them and surrounding the rod g, as shown in Fig. 2.

L is a steam-gate' through which steam is admitted to the steam-chest L' of the cylinder F', and h is the steam-valve by which the admission ot' steam to the cylinder F', above the piston K', is controlled. When the steam above the piston K' has accomplished its work of forcing the pistons K and K', the piston-rod g, the stamp-shaft b, and stamp 1 downward to give the desired blow, the steam escapes through the exhaust-port andthe valve h' into the pipe L2, through which it passes to the condenser M. The pipe L2 is connected by the pipe L3 with the chamber between the two pistons K and K', for the purpose of maintaining a vacuum in said chamber. The chamber N, between the cylinder F and the outer casing, F2, and the chamberbeneath the piston K, are supplied with steam at a constant pressure by means ofan automatic valve, N'. (Shown in Fig. 2.)

The valve N', not being ot'my invention, is not shown in detail in the drawings, and need not be described here further than to say that the valve which I have successfully used in this connection is shown and described in Letters Patent No. 249,060, granted to Joseph E. Watts, April 12,1881, which operates to maintain a uniform maximum pressure beneath the piston K; or, in other words, the valve N' IOS IIO

IIS

so regulates the admission of steam to the tions of which project through slots ando',

chamber N and the space beneath the piston K that the` maximum pressure therein is uniform, regardless of what may be the fluctuations of pressure above the piston K'.

0 is an air-pump for discharging the air and water from the condenser M.

The rod g is connected to the stamp-shaft b by a swivel-connection, so that the stem b and stamp I may be revolved by means of a flanged pulley, i, mounted upon the sleeve t" and a suitable belt leading therefrom to any suitable driving-pulley. The sleeve i' surrounds the stem b between the tie-girts G and G', and is connected to said stem by means of suitable keys and keyways, so that as said sleeve is revolved the stamp-shaft b and the stamp l must revolve therewith, while at the same time lit is free to he moved endwise through said sleeve as the stamp rises and falls.

The short serrated section of `cylinder f3, upon the head f', serves as adash-pot to limit the ldownward movement of the piston K, the steam` contained therein serving as an elastic cushiong-.to receive the blow, the serrations formed in the upper end of said short cylinder serving asfports for the admission of steam to the cylinderF, and by virtue of their peculiar shape to gradually check the downward movement of the piston and prevent undue shock to the cylinder.

P, P', and P'are the several floors of the building through' which the pyramidal frame extends, as shown.

Q is the hopper or chute through which the ore is supplied to the mortar in a well-known manner.

R is a frame or bracket secured to the front side of the cylinder F', and supporting thereon the pillow-blocks R and R2, in which is mounted the shaft S, upon one end ot' which is rmly secured the pulley S', by means of which and a suitable belt leading' therefrom to a drivingshaft (not shown) said shat'tS may berevolved.

The shaft S has formed in its periphery two keyways or spline-grooves, jandj', extending spirally partially around said shaft in opposite directions, 'as shown in Fig. 18, in each of which is tted a curved key, k, which is provided with an outwardly-projecting lip, the sides of ,whichv are parallel with the axis of said shaft, and the outer edge of which is provided with the lugs l l to embrace the grooved collar T or T', as shown in Figs. 19 and 20. The shaft S has rmly secured thereon, so as to revolve therewith, the two annular or inside face-cams, U and U', arranged respectively to open the steam-valve h and to close the exhaust-valve h' through the medium, in the one case, of the truck m, lever V, yoke W, and valve-rod n, and, in the other, of the truck m', lever V', yoke W', .and valverod n'. Within these annular cams U and U' are two face-cams, each provided with a long hub,-X or X', and mounted upon theshaft S, and connected thereto, 'so'a's to revolve therewith,by means of the keys k, the outer porrespectively, which are cut longitudinally of said hubs, as shown in Figs. 19 and 20, so that said cams and their-hubs X and'X' may be moved to a limited extent around said shaft, while said shaft is in motion, for the purpose of varying the time of closing the steam and opening the exhaust valves, respectively, which is done by said face-cams acting upon the opposite sides of the same trucks, m and m', that are acted upon by the annular cams U and U' to open the steam and close the exhaust valves.

The lever V for operating the steam-valve h is a two-armed bent or elbow lever, the upright arm of which is forked so as to embrace the outer bar of the yoke W, and is pivoted thereto at m2, and thev movable end of the other arm has mounted upon a suitable journal set therein the truck m, all as shown in Figs. 3 and let.

The lever V', which operates the yoke W', y

and through it the exhaust-valve h', is a single-armed lever slotted upon its inner face so as to embrace the outer bar ofv the yoke W', and provided with the slotted projection V2, in which is mounted the roll fm' upon the pin m3, which also serves as the pivotal connection between the lever V' and the yoke W', as shown in Figs. 15, 16, and 17.

A' and A2 are forked elbow-levers provided at their forked endswith trucks or studs to engage with the peripheral grooves in the collars T and T', respectively, and having pivt-A ed to their opposite ends the links a.' and a", respectively, the lower ends of which are in turn pivoted to the screw-rods b' and b2, fitted to the hand-nuts d' and d2, and guided at the their upper .ends'in the slides e' and e2, re-

.spectively,`as shown in Fig. 3. By turning the hand-nut d' the collar T Will be moved along the hub X, carrying with it the key k, which, moving in `the spiral groove j in the shaft S, will cause the hub X and its cam to be moved around the shaft S, so as to vary the angular distance between the throw of said cam, which closes the valve h, and the throw of the cam U, which opens said valve, By turning the hand-nut d' a precisely similar result is produced upon the hub X' and lits cam as a means of varying the movements of the exhaust-valve h'.

A grooved-collar, b3, is firmly secured upon the rod g, and engages with the forked lever b4 to vibrate it as the rod g moves up and down.

The lever b4 is connected by the link g2 to the lever g3, the opposite end of which is pivoted to the rod h2, arranged to slide vertically in bearings, and provided at its upper end with means ofconnection with a cord for operating a steam-indicator. (Not shown.)

The valves h and h' are prevented from bei'ng thrown too far by their operating cams by mounting their stems ory the connecting portions of the yokes W and W' in the frictionbearings Y, as shown in Fig. 14.

Upon the inner corner of each of the columns E of the lower section of the pyramidal frame-work is securely bolted a bracket, E', having at its inner edge two faces at right angles to each other, which, with the fixed lips i2 i2 and the detachable lips 3713, form vertical grooves, into each of which are tted two pieces of wood, i4 and i5, against the latter ot' which the planed surfaces i6 i6, formed upon the sides of `the mortar, bear to hold said mortar in position and at the same time permit it to move vertically as the blow of the descending stamp is received upon the die c.

By constructing the pyramidal frame in sections, as described, and the lower section of the four columns E and brackets' E', the mortar or screen chamber may be removed for repairs by removing three of the brackets E' and Letters Patent of the United States, is-

1. The combination, in a steam -operated stamp, of a pair of differential steam-cylinders in axial line with each other, means of maintaining a constant pressure beneath the piston of the smaller cylinder, means of intermittently admitting steam to and exhausting it from above the piston of the larger cylinder, and a stamp-shaft carrying at its lower end a stamp, die, or hammer, substantially as described. 2. The cylinder F, the casing F4, surrounding saideylinder and inclosing an annular chamber, openings or ports connecting said annular chamber with the interior ot' said cylinder, and an automatic valve adapted to control the admission of steam to said chamber and cylinder and maintainthemaximum pressure therein at a uniform standard, substantially as described.

`3. The cam-shaft S, provided with the spiral groove i',in combination with cam Utixed thereon, the slotted hub X and its cam, the key 76 the collar T,and means of' moving said collar along said hub X, substantially as and for the purposes described.

4. The combination of the shaft S, provided with the spiral groove j, the cam U, slotted hub and cam X, key 7c, collar T, forked elbowlever A', link a', screw-rod-b, and hand-nut d', all arranged and adapted to operate substantially as and for the purposes described.

5. The combination of the differential cylinders F and F', the pistons K and K', and the dash-pot f3, all constructed, arranged, and adapted to operate substantially as and for the purposes described.

6. VIn a steam-operated ore-stamp, the combination, with the stamp-shaft and a steampistou for operating it., ot' a dash-pot adapted to receive said piston and limit its downward stroke by a cushion of steam, and a second and inverted dash-pot surrounding said stampshaft, but removed from the steam-cylinder and adapted to limit the upward movement of said shaft by means of a cushion of air, substantially as and for the purposes described.

7. 1n combination with a vertically-reciprocating stamp or hammer, a mortar or stamping-chamber, and a steam-cylinder and piston for operating said stamp or hammer, an iron frame-work for supporting said cylinder and the other operative parts of the machine, made pyramidal in form and divided horizontally into three sections or stories, the upper section being cast in one piece and the lower section in two or more pieces, the whole being so united as to be self-supporting and independent of the building in which it is placed, substantially as described.

8. In a steam-stamp, a pyramidal frame divided horizontally into two or more sections or stories, the upper section or story of which v is cast in one piece and the lower section in two or more pieces, one of which may be removed to permit the removal of the mortar, in combination with brackets or guides secured to said lower section and adapted to support or guide the mortar in its slight vertical movements, substantially as described.

9. The combination of the cams U and X, lever V, yoke W, valve h and its rod, and the friction-bearing Y, all arranged and adapted to operate substantially as described.

10. The combination of the diferential cylinders F and F', the annular casingF, cast in one piece with the cylinder F, and the annular eXpansion-platef4, all constructed, united, and adapted to operate substantially as and for the purposes described.

11. In combination with thecylinder F, open at its bottom and provided with the annular casing F2, the head f', provided with the short cylinderf3, open at its upper end, and suitable openings for the passage of steam between the contiguous ends of said cylinders F and f3, substantially as described.

12. The combination of twodierential cylinders arranged in axial line with each other, two differential pistons mounted upon a common piston-rod, and means ot' maintaining a vacuum between said pistons, substantially as described.

13. The combination of the screen-chamber O2, provided with the surfaces i6, the brackets E', provided with the guideways i2, and the columns E, all arranged and adapted to operate substantially as described.

14. The dash-pot f3, provided with a series of V-shaped notches in its upper edge, substantially as described.

ERASMUS D. LEAVITT, JR.

Witnesses:

DECoURoY MAY, Gr. E.WH1TNEY.

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