US727809A - Stamp-mill. - Google Patents

Description

No. 727,809. PATENTED MAY 12 1903.

0 GFLANE. 'STAMP MILL.

APPLICATION FILED DEC. 5. 1901.

N0 MODEL.

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Patented May 12, 1903.

Prion.

. CHARLES 0. LANE, OF LOS ANGELES, CALIFORNIA.

STAMP-MILL.

SPECIFICATION forming part of Letters Patent No. 727,809, dated May 12, 1903. Application filed December 5, 1901. Serial No. 84,811. (No model.)

To all whom it may concern:

Be it known that I, CHARLES 0. LANE, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles, State of California, have invented new and useful Improvements in Stamp-Mills, of which the following is a specification.

My invention relates to that class of stampmills in which the ore is crushed by the fall of a stamp which has been lifted to a predetermined height and then falls by gravity upon the ore or other material in the mortar; and the objects thereof are chiefly to provide a mill in which the fall of the stamp is easily adjusted and in which the power required to raise the stamp is reduced to the minimum and certain improvements in the mortar and in other parts, as hereinafter described and claimed, and illustrated in the accompanying drawings, forming a part hereof, in which- The upper part of Figure 1 is a front view of my improved stamp-mill,and the lower part is a central vertical section of the mortar, the die being in elevation. Fig. 2 is a side View, partly broken away, of a modified form of a gripping device, guide, and pitman connection. Fig. 3 is a side view of a swivel-joint, one side of the lower member being removed.

In the drawings, A is the frame of the machine, in the top of which is mounted shaft B, on which shaft is driving-pulley G and crank D, carrying pin E, which is connected to the vertical guide F, moved in guideway G, by pitman H. The vertical guide is connected to spiral guide I by a swivel-joint, (illustrated in Fig. 3,) so as to permit of a vertical movement of guide F, while guide I has a spiral 0r twisting movement, which is given thereto by the inclines or spiral guidelugs I, afiixed to the frame. The swivel-joint is composed of a stem g, which is affixed to guide F and has one or more projecting circular flanges g, which fit in corresponding recesses in a socket h, affixed to guide 1. Bigidly affixed to the spiral guide are the resilient gripping-prongs J, having catches J on their adjacent faces at the lower end, which lower ends curve downwardly and then upwardly to form release-hooks J. These gripping-prongs are adapted to pass over the cone-shaped head K- of the stamp-stem L and grip and retain a hold on the same until released therefrom. They are provided with pins Z to prevent vibration when released from the stamp-head. The stem is adjustably connected to the stamp-head M, and a spring N, coiled around the stem, prevents a sudden jar when the stamp is raised. bottom of the stamp is the removable shoe M, which when worn to the stam p-head may be removed and used as adie until completely worn'out. O is the mortar, which has a hole in the bottom thereof, around which is an upwardly-projecting flange O, which with outside casing forms an annular cup for holding mercury. Projecting into the mortar through the hole in the bottom thereof directly below the shoe orstriking-face of the stamp is die P, which consists of a'plurality of removable sections. The lower section of the die rests upon a metallic adjusting-plate R, whose ends projectbeyond the removable metal spacingplate S, resting on cap-plate T on the end of timber U. As the die wears away it may be raised, the projecting ends of the adjustingplate providing a convenient means therefor, and an additional spacing-plate interposed between the cap-plate and the adjusting-plate to retain the face of the die in its proper position. If desired, the die may consist of a single piece and may be adjusted to compensate for wear in any suitable manner, such as suitable plates of different thicknesses to be placed on the' supporting-timber under the die, a thicker platebeing substituted for a thinner one to compensate for the wear. The joint between the die and mortar-box is made water-tight by a packing-ring V, of rubber, which is held compressed against the bottom of the mortar and the die by a metallic plate W, which is attached to the mortar by bolts X.

In this construction of a stamp-mill there are many advantages over the stamp-mills which use the cam and tappet for raising the stamps, among which are the following; The lifting power to raise the stamp is applied more directly and with less friction. The stamp can be lifted tomuch' greater height than is practicable with a cam and tappet, and therefore a much lighter stamp may be used to obtain the same effec't'as a heavier stamp falling a less distance, and the mill may be constructed of lighter material. The

adjustment of the pitmau on the crank-arm In the ore in the mortar.

provides a-ready means of changing the stroke of the stamp. The shoes and dies may be more nearly worn out than in other mills and less metal be thrown on the scrap heap.

111 the operation of my mill power is applied to cause the rotation of the crank-arm. As it rises it elevates the stamp, which is turned slightly by the spiral guide, so that the striking-face of the stamp will fall with different parts of the stamp and die oppositely disposed to the parts which were oppositely disposed at the preceding fall of the stamp,

and thereby preserve an even wear on thestriking-face and on the die-face. As the gripping-prongs rise to near the upper limit of movement the release-hooks contact with release-bars Y, affixed to the frame, which bars cause the separation of the grippingprongs far enough to release the head of the stamp-stem, when the stamp falls upon the These release-bars are adjustable on the frame, so as to cause the release of the stamp at any point in its upward movement, the release-hooks being constructed to that end. If desired, the pitman may be connected by a universal joint directly to the spiral guide and the vertical guide dispensed with, as illustrated in Fig. 2. I prefer to use both guides when running at a high rate of speed, as the vertical guide gives greater steadiness. In Fig. 2 I have also illustrated a modified form of gripping device, in which a represents gripping members to grip the head of the stamp-stein. These members are pivoted to the spiral guide I), which is connected with the pitman by the universal joint 0. The gripping members are released on their upward movement by coming in contact with the release-blocks d, affixed to the frame, and the gripping ends are held closed by spring e,which gives them a positive grip on the head of the stem of the stamp on theirdownward movement. When the stamps are to be operated in gangs, the cranks may be on one or more shafts in properrotation and the length of the drop regulated by the crankarms or the position of the releasebars. In case the drop is regulated by the position of the release-bars the gripping-prongs must be constructed so as to release the stamp before the full upward stroke is made. Eccentrics may be used on the shaft instead of cranks, if desired. I am aware that gripping-prongs have been heretofore used to catch the head of a stem; but in all the gripping devices with which I am acquainted gravity is depended upon to cause the prongs to come together to grip the liead of the stem. This movement is all right where a quick movement of the stem is not required; but where speed is required gravity is too slow in causing the prongs to grip the head of the stem, and to obtain a quicker movement I make the prongs of resilient material or spring-press them, so that they will spring in upon the head of the stem immediately the head passes the catches of the prongs.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A stamp-mill comprising a frame; a shaft mounted in the upper portion thereof; a crank affixed to said shaft; a pitman connected to said crank; a guide connected to the pitman; resilient gripping-prongs affixed to the guide; said gripping-prongs having catches on their adjacent faces,and outwardly and upwardly turned release-hooks on their lower ends; release-bars affixed to the frame, adapted to contact with the release-hooks of the prongs on their upward movement and release the head of the stamp-stem from the prongs; a stamp having an upwardly-extending stem with a conical-shaped head; and a mortar having a removable die projecting through the bottom thereof.

2. In a stamp-mill, a mortar having a hole in the bottom thereof; an upwardly-projecting flange integral with the bottom projecting upwardly and surrounding said hole; a die projecting through the flange in the bottom of the mortar; means to adjust and support said die; in combination with a stamp; and means to operate said stamp.

3. A stampmill comprising a frame; a shaft mounted in the upper portion thereof; a crank affixed to said shaft; a pitman connected to said crank; a guide connected to the pitman; resilient gripping-prongs affixed to the guide; said gripping-prongs having catches on their adjacent faces,'and outwardly and upwardly turned releasehooks on their lower ends; release-bars affixed to the frame, adapted to contact with the release-hooks of the prongs on their upward movement and release the head of the stamp-stem from the prongs; in combination with a mortar.

4. In a stamp-mill for crushing ore comprising a frame; a shaft mounted in the top thereof; a crank-arm on said shaft; a pitman connected to said crank-arm; a vertical guide connected to said pitman; a spiral guide rotatably connected to the vertical guide; resilient gripping-prongs affixed to said spiral guide, having catches on their inner faces; and outwardly and upwardly turned releasehooks on their lower ends; release-bars affixed to the frame, adapted to contact with the release hooks, and release the stamp therefrom on its upward movement; a stamphead having at one end an upwardly-projecting stem provided with a conical head and a removable shoe in the end opposite the stem;

and a mortar having a removable die project:

ing through the bottom thereof; and means to support and adjust said die to compensate for the wear thereof.

In witness that I claim the foregoing I have hereunto subscribed my'name this 29th day of November, 1901.

CHARLES 0. LANE.

Witnesses:

G. E. HARPHAM, ll/IATTIE MOGINNIS.

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