US524562A - Raisin-grader - Google Patents

Description

(No Model.)

J. PORTEOUS. RAISIN GRADBR.

No. 524,562. Patented Aug. 14, 1894.

c uonms PETERS co moroumo wgsnmnron a c TUNITED STATES PATENT 'OFFICE.

JAMES PORTEOUS, OF FRESNO, CALIFORNIA.

RAl SlN-GRADER.

SPECIFICATION forming part of Letters Patent No. 524,562, dated August 14, 1894. Application filed January 10, 1894. Serial No. 496,424. (lip model.)

, To all whom it may concern:

. Be it known that I, J AMES PORTEOUS, acitizen of the United States, residing in Fresno, Fresno county, State of California, have invented an Improvement in Raisin-Graders; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to the general class of devices for separating or grading particles of material according to their sizes, and in which a vibrating shoe carrying a series of sieyes is employed.

My invention, though applicable to machines for separating various materials, is especially adapted for the grading of raisins,in which it forms a part of a general raisin mill embodying devices for cleaning and stemming, as well as gradin My invention consists in the novel construction and arrangement of the several parts, which I shall hereinafter fully describe and specifically claim.

In graders of this'charactenwherein screens are mounted in a vibrating shoe, said screens have heretofore, as far as I am aware, been connected fixedly with the shoe, and have had no other movement than that of the shoe itself.

The object of my invention is,by imparting an independent movement to the screen or screens, accompanied by a jar or bump to effect additional agitation or impulse of the material which, especially in the grading of raisins, is of great advantage, in that it prevents the clogging of the perforations or meshes of the screens, a tendency which raisins, on account of their gummy character, invariably have.

Referring to the accompanying drawings foramore complete explanation of my invention,- -Figure 1 is a perspective view of a raisin mill showing my grader. Fig. 2 is a vertical longitudinal section of the shoe and screens. Fig. 3 is a detail section showing the loose connection between the screen and shoe.

A represents generally the frame of what may be called a raisin mill, the parts of which need not be particularly described other than those referring to the grading portion. In the lower portion of this frame is mounted the inclined shoe B. This is pivotally suspended by means of links 0, one or more on each side. These may be vertical, but where the raisins are particularly gummy and require to be shaken more vigorously, they are set at an inclination whereby they impart a movement to the shoe which is the result of a combined vertical and horizontal motion which gives a greater shake to the shoe and increased jar to the loose screen thereon. The suspending links are also adjustable, both horizontally and vertically, whereby the resultant motion may be varied as required.

This adjustability is effected by means of the upper vertical series of holes 0, and the lower horizontal series of holes 0' in whichthe ends of the links are pivotally mounted. The upper or head end of this shoe may be suspended from links such as C, but I have shown it as mounted upon eccentrics d on a drive shaft D, by the rotation of which, in connection with the suspending links, the shoe is given a peculiar combined vertical and longitudinal movement, which may be termed ashake or vibration. In this shoe is carried a screen E, or as I have here shown, a vertical series of screens, having different perforations or meshes to efiect the grading of the raisins into different sizes.

I have found by experience that the agitation imparted to the raisins by the mere shaking of the shoo,at a proper rate of speed, is

not sufficient to keep the meshes or perforations of the screens free, and there is a tendency, on account of the gummy character of the raisins, to clog the screens. To remedy this diffiulty I have not connected the screen or screens rigidly with the shoe. The former may have, therefore, a sliding movement in the shoe in the direction of their length, and may also have an up and down movement, both independently of the shoe, said movements being occasioned by the continuance of the movements of the screens at the ends of the stroke of the shoe. The inclined links suspending the shoe give, by their adjustments, more or less jar to the screens set loosely upon it. This additional movement or movements of the screens gives such in? creased agitation or sharp impulse to the material that the tendency to clog or gum up is overcome, for the sharp blow dislodges a raisin fast in a hole, either by making it fall through orby passing it on over the screen. Thismovement is accompanied by a jar or bump which may be effected in any suitable manner as by providing suitable stops for the ends of thescreens, and it is also ettected by the drop of the. screen onthe shoe in its up I have found the best and down movement. construction,however, to be that here shown, in which there are secured to the inner surface of the sides of the shoe, at its headfend,"

thebrackets F, beyond which are the guides f on "which the screens rest.

Under the sides of the screens, at their head ends, are the wearing plates H which lie freely upon top of the brackets F. Thesev plates are rigidly bolted and secured to the screens. ..Rods Ipass down through the extremities of theseplates and of. the brackets, and.the holes through which they (pass are sufficiently. largerthan therods to give them a free lateral playtherein.

. ,fore,,.that :when the shoe is vibrated, the screens in accompanying it willhave also the ,additional movements of. their own, both up and down, and in sliding on their bearings in 1 the shoe to the extent of the lateral play of the rods I, and these movements Will be ac- .companiedby the jar orbump occasionedby the bringing up of the rods and their limitaand also. by the drop of the screen on theshoe.

andimpulse, jar or bump are givento the ma-,

tion in-the holes in which they are seated,

Thus the increased or supplemental agitation terial whereby the result of, avoiding theologiging of the screens is effected.

-Having thus describ d my invention, what It follows, thereto move in vertical planes whereby said screen may have inaddition to themovement of the shoe an independent vertical movement'of its own, substantially as herein described.

2. In a grader or separator, and in combination with a vibrating shoe, a screen supported loosely upon said shoe, having one end secured to the shoe and the opposite end unconnected whereby it may have in addition to the movement of the shoe an independent movement of its own in vertical planes, and

means for limiting said-independent move- ..ment ofthetscreen' to produce a jar or bump,

substantially as herein described.

3. In a grader or separator, the.v combination of a vibratingshoe, a screen supported loosely thereon with its lower end free and unconnected so that it may have, in addition to its movement with theshoe, an independent movement of its own in vertical planes, and a rod loosely connecting the upperend of the screen to the sh0e, vvhereby the screen is limited inits independent movement and is subjected tea jar or bump. ,7 p

4:. In a grader or separatonthe vibrating shoe having the guides on its inner side, and the brackets at its head end, in combination with a screen mounted loosely upon said guides, and having plates secured to its under side and resting freely on the brackets of the shoe, and rods seated loosely in .holes in the extremities of the plates and brackets, and connecting the head end of the screen to the shoe, said screen havingits opposite end free and unconnected, substantially as herein described.

In Witness whereof Ihave hereunto set my hand.

JAMES PORTEOUS. Witnesses:

S. H. NOURSE, H. F. ASCHECK.

Images