US1335519A - Head-motion for concentrating-tables - Google Patents

Description

N. MOSSBERG.

HEAD MOTION FOR CONCENTRATING TABLES.

2 SHEETS-SHEET I.

Patented .Mar. 30, 1920.

APPLICATION FILED MAY 41,1918. 1,335,519.

- avwawt m jV/a Mash N. MOSSBERG.

HEAD MOTION FOR CONCENTRATING TABLES- APPLICATIQN FILED MAY41l9IB- 1 ,335,51 9. Patented Mar. 30, 1920.

2 SHEETS-SHEET 2 NELS MOSSBERG, 0F DENVER COLORADO.

HEAD-MOTION FOR CONGENTRAT ING -TABLES.

Specification of Letters Patent.

Patented Mar. 30, 1920.

Application filed May 4, 1918. Serial No. 32,518.

To all whom it may conccra'z:

Be it known that I, New T/IOSSBERG, a citizen of the United States, residing at the city and county of Denver and State of (olVorar/lo, have invented certain new and useful improvements in Heacl-lliotions for toncentrating-Tables; and I do declare the :t'ollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

luv invention relates to improvements in head motions, more especially adapted for use in connection with concentrating tables requiringa long stroke and, a differential movement, whereby the material thereon is given a tendency to travel in the direction of its reciprocation, though it must be understood that the mechanism is equally well adapted for use in other relations where a similar function is required.

As the more common use for this mechanism will be in connection with concentrat-- ing tables, it will be described with special reference to this use, though as above lndicated, it must be understood, that the con-' struction is not limited to use with any particular construction.

As applied to a concentrating table, the device is connected with one end of the table called the head, and the head motion is of such character that the material which is fed to one side of the table, is given a general tendency to travel toward the foot or tail of the table or the end opposite the end where the head motion is connected. During this operation of the table, the wash water which is also delivered at the edge of the table where the material is fed; serves to effect the separation'of the metallic values from the gangue, the gangue being carried transversely across the table and discharged at the edge thereof opposite that where the feed takes place, both as to material to be treated and wash water.

This head motion-is of such construction that it imparts a differential reciprocating movement to the table, the length of the stroke depending on the length of a crank formed in the operating shaft which is connected by means of a pitlnan with a. lever or oscillatory arm which is connected with a concentrating table by a rod, one end of which is adj ustable on the lever by means of a screw which is journaledin parts connected with a lever and engages a nut in the adjacent end of the connecting rod. By adj usting the lever end of the connecting rod, the length of stroke may be regulated for a given crank throw.

The mechanism briefly described in the preceding paragraph will impart reciprocating differential movement to the concen trating table, but alone it is objectionable for the reason that there is undue wear on the joints which soon results in lost motion, and consequently the required func tion is imperfectly performed. In orderto overcome this difficulty I arrange a second lever or oscillatory arm preferably rearward of the first named lever and between the latter and the crank shaft. The upper end of the second lever or that remote from its fulcrum is connected with the concentrating table independently of the first named connecting rod, while between the upper extremity of the second lever and its fulcrum a yoke is connected with the second lever, the yoke having a cross head arranged in opposing relation to a stop mounted upon a stationary rod, a spiral spring being arranged on the rod between the stop and the cross head This springserves to keep the table and all the parts of all the joints in close engagement during'the'movement of the table or other body with which the head motion is connected. This spring is placed under tension during the forward movement of the table and its recoil cooperates with the crank shaft in effecting the return movement and at the same time maintains the parts of the joints in close relation, as above indicated.

Having briefly outlined my improved head motion I will proceed to describe the same in detail, reference being made to the accompanying drawing in which is illustrated an embodiment thereof. In this drawing:

Figure 1 is a vertical longitudinal section taken through my improved head motion on the line 1-1, Fig. 2, showing the same connected with the body to be reciprocated.

Fig. 2 is a top plan view of the same with the forward connections partly broken away. This is a view looking in the direction of arrows 2, Fig. 1, with the upper part of the housing removed.

Fig. 3 is asection taken on the line 33, Fig. 1 looking toward the left.

Fig. 4 is a view similar to Fig. 1 but showing the parts in different relative positions.

Fig. 5 is a section taken on the line 55, Fig. 4 looking downwardly.

Fig. 6 is a side elevation of the structure with the inclosing housing applied.

The same reference characters indicate the same parts in all the views. Let the numeral 5 designate a stationary frame work which as illustrated in the drawing, is composed of two vertically disposed parallel side members 6 and front and rear members designated 7 and 8 respectively. To this frame work which as shown is provided with openings 3 on opposite sides, a removable housing member 9 may be applied, the same having a hand piece 4 for convenience of manipulation.

A lever 10 occupying an upright position is fulcrumed on trunnions 12 extending horizontally from a block 26 secured to the upper extremity of the lever, these trunnions being journaled in boxes 13 mounted on the frame on opposite sides of the lever, thus giving a strong and stable support for the lever and the parts connected therewith, as

hereinafter described. The lower extremityv of this lever or that remote from the fulcrum is provided with a part 14 which is pivotally connected in the rear. as shown at 15, with the forward end of a pitman 16, the rear extremity of the pitman being con.- nected with the crank 17 of a crank shaft 18-, the latter being journaled in boxes 19 mounted on the rear part of the frame. This crank shaft is provided at one extremity with fast and loose pulleys 20 and 21 respectively, the fast pulley preferably serving as a fly wheel and constructed accordingly.

The part 14 which is secured to the lower extremity of the lever 10 or that remote from the fulcrum trunnions 12, extends forwardly of the lever, as shown at 22, andin it is journal d as shown at 23. thelower extremity of a screw 24 which is parallel with the lever 10, its upper extremity being journaled, as shown at 25, in the block 26 secured to the upper extremity of the lever and fast thereon, as heretofore stated.

The upper extremity of this screw is provided with a hand wheel 27 for convenience of manipulation. A member 28 is slidablv connected with. the shaft 10 between the block 26 and the member 14, while the screw 24 is threaded in the member 28 forward of the lever. Hence, as the screw is turned, the member 28 is vertically adjusted on the lever intermediate its extremities. The forward end of the member 28 is pivotally connected, as shown at 29, with the rear extremity of a rod 30 whose forward extremity is pivotally connected, as shown at 31 with the member to be reciprocated, which may be designated by the numeral 32 which indicates two beams which are stationary with the concentrating table or other member to be reciprocated.

As the crank shaft is rotated the body 32 will be given a differential reciprocating movement which would have a tendency to cause the material thereon to travel forwardly.

A second lever 33 is arranged in the rear of the first named lever and is provided at its lower end with a horizontally disposed hub 34 which, as shown in the drawing, is integral with the lever and rotatably connected with the frame by means of a spindle 35 which passes through perforations in the frame and an alined perforation in the hub. This lever 33 is provided a short distance above its fulcrum with a shorter spindle 36 -which passes through a reinforcement 37 in the lever, the opposite extremities of the spindle being respectively connected with the forward ends of two spaced parallel rods 38, which rods pass through the protruding extremities of the spindle 36 and are connected with the lever by nuts 39. The rear ends of these rods are connected with a cross head 40 which is slidable on a central rod 41 whose rear extremity passes through a perforation 42 in the lower part of the frame, its forward end being threaded into a stop nut 43. A spiral spring 44 surrounds the rod 41 and is arranged between the cross head 40 and the stop nut 43. By rotating the rod by applying a wrench to its head 45, the tension of the spring may be regulated, since by such operation the nut will be made to travel either forwardly or rearwardly, as may be required.

The upper extremity of the lever 33 which is bifurcated as shown at 46, is provided with a short shaft or spindle 47 which is journaled in the opposite parts of the bifurcated portion, and a rod 48 is passed through a perforation in the spindle and connected, as shown at 49, with the center of a plate 50, whose opposite extremities are connected, as shown at 51, with the arms 52 of a yoke 53 whose forward end is formed into a loop 54 which is connected with a hook 55 of a rod 56, the latter being con nected with the body 32 to be reciprocated, as shown at 57 and 58. I

From the foregoing description the use and operation of my improved head motion will be readily understood. This structureas illustrated is well adapted for imparting a relatively long stroke to the body to be reciprocated, as distinguished from an exceedingly short stroke, which is usual with differential head motions for concentrating tables, though it is evident that as short a stroke as desired may be obtained through the medium of my improvement. The stroke is regulated by the crank shaft and by the position of the adjustable member 28 upon the lever 10.

It is evident that as the crank shaft is rotated a differential reciprocating movement will be imparted to the body 32 through the medium of the pitman 16, the lever 10 and the connecting rod 30. During the forward movement or that toward the left, referring more particularly to Figs. 1, 2 and 3 of the drawing, the parts of the different oints, as those at both extremities of the pitman, the joint between the connecting rod 30 and the member 28! andi, the joint between the forward eXtremitiy of the rod 30 and the body to be reciprocated, are necessarily held in close contact on the forward side, since the power comes from the crank shaft and is exerted in a forward direction. During the movement in the opposite direction, in the absence of mechanism which utilizes the spiral spring .4., there would be a tendency to produce wear in these joints and result in lost motion which has been found by experience to seriously interfere with. the proper performance of the function of a device of this character. By the employment of the spring, the parts are held in close contact in both directions during both strokes, and the spring exerts a cushioning efiect at the ends of both strokes, thus obviating any undue wear during these periods of the operation of the device. This is a very important point, and the spring and the mechanism connected therewith and connected with the body to be reciprocated serve to produce this I result.

Attention is called to the fact that the location of the spring 44: well down in the frame work and so that its axis intersects the lever 33 close or comparatively close to the fulcrum, makes it practicable to impart a relatively long stroke to the table while the movement of the spring is comparatively little. For instance, when the parts are connected substantially, as shown in the drawing in Figs. 1 and 2, while a four inch stroke may be imparted to the table, the movement of the spring is only about one inch. These proportions may be varied at pleasure by adjusting the member 28' upon the. lever 10, since the higher this member, the shorter the stroke and consequently, the lower this member, the longer will be the stroke imparted to the table. It should be explained that there is a limit to the movement of a spiral spring in the direction of its axis and as compared with'its length, in order that the life of the spring may be of such length as to make its use practicable. The mechanism cooperating with the spring in my improved head motion is constructed and arranged with reference to the mechanism directly connecteo and operated by the crank shaft to produce this result. By virtue of the sliding movement of the member 28 upon the lever 10, a relatively wide range of variation in stroke is available in my improved head motion structure.

By reference to the drawing it will be understood that in Fig. l the parts are positioned to correspond with their location when in the middle of the stroke, while in Fig. l the full line position of the parts corresponds approximately with their position at the end of the forward stroke, while the dotted lines indicate their position approximately at the end of the rearward stroke.

The parts 10 and 33 which have been referred to as levers in the description may perhaps more properly be termed oscillatory arms, and will be so designated in the claims.

Attention is called to the fact that in my improved construction the differential character of the movement results from the fact that the pitman is connected with the oscillatory arm 10 beyond a horizontal line passing through the axis of the crank shaft. In other words, if the pitman 16 were so connected with the oscillatory arm 10 that a horizontal line cutting the axis of the crank shaft would pass through the axis of the crank and the point where the pitman is connected with the arm 10, when the body 32 is at its forward limit of movement, there would be no differential movement imparted to the body, since the axis of the crank would pass through the same length of arc in making both the forward and rearward strokes, and consequently, the time occupied during both strokes of the table would be the same. Hence, there could be no differential movement such as is required in concentrating tables for instance, in order to cause the material to travel forwardly, I will say, upon the table during the operation of separating the concentrates from the gangue on the principle heretofore outlined. In order to obtain this differential movement I connect the pitman 16 with the oscillatory arm 10 at a point below a horizontal line cutting the axis of the crank shaft, the result being that the axis of the crank travels through a greater length of arc while imparting the forward stroke to the body to be actuated than while imparting the rearward stroke, and consequently, as the crank is traveling at the same speed while imparting both strokes, the rearward stroke must be accomplished in less time than the forward stroke and the table must travel. more rapidly during the rearward stroke. This is the so-called differential characteristic of my improved head motion.

Having thus described my invention, what I claim is:

1. In apparatus of the class described, the combination with a body to be actuated, of an oscillatory arm connected with said body, a crank shaft, a pitman connecting the arm with the crank of the shaft to impart differential reciprocating movement to the body, a second oscillatory arm, aconnection between said last named arm and said body independent of the connection between the first named arm and the body, and a spring connected with the second arm to have its tension alternately increased and released as the body is actuated.

2. In apparatus of the class described, the

combination with a body to be actuated, of

an oscillatory arm connected with said body,

a crank shaft, a pitman connecting the arm with the crank of the shaft to impart differential reciprocating movement to the body,

a second oscillatory arm, a connection between said last named arm and said body independent of the connection between the first named arm and the body, and a spring connected with thcsecond arm to have its tension alternately increased and released as the body is actuated, the said last named connection being such as to impart to the spring comparatively little movement.

3. A differentialhead motion comprising in combination with a body to be actuated, two oscillatory arms independently connected with the said body, a crank shaft connected with one of said arms for imparting reciprocating movement to the said body, and a spring connected with the other arm to be alternately placed under tension and released.

4. A differential head motion comprising in combination with a body to be reciprocated, an oscillatory arm, an operative connection between said arm and said body, means for imparting oscillatory movement to the arm to reciprocate the body, and a spring held oscillatory arm independently connected with the body.

5. ii. differential head motion comprising in combination with a body, an oscillatory arm, an operative connection between said arm and said body, means for imparting oscillatory movementto the arm to reciprocate the body, a second oscillatory arm connected with thebody independently of the first named arm, a stationary rod, a stop carried thereby, a cross head slidable on the rod, other rods connecting the cross head with the second oscillatory arm, and a spiral spring mounted on the stationary rod between. the cross head and the said stop.

In testimony whereof I aflix my signature.

NELS MOSSBERG.

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