US77509A - Improvement in sand-screens - Google Patents

Description

A v M-feZ/ @einen tetes meut @ffice ROBERT MCMU'BBAY, OF BROOKLYN, NEW YORK.'

Letters Patent No. 77,509, dated May 5, 1868.

i IMPROVEMENT IN SAND-SCREENS.

T0 ALL WHOM IT MAY CONCERN:

Be it known that I, ROBERT McMURRAY, of Brooklyn, of Kings county, in the Statc'of New York, have invented certain new and useful Improvements in Smid-Screens; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making part of this application.

My invention relatesto a. new and useful improvement in sand-screens, and has for its objects the production of a simple, durable, and effective apparatus. I v

Previous to my invention, one ofthe great diicnlties in the practical use of screens, such as used general] by builders or masons to screen sand,has been the liability of the vertical wires to become displaced and inoperative, rendering the screen ineffective. Some devices or means have been suggested to prevent the slipping laterally and the sagging of the vertical wires, and one or more patents have been granted for such devices; but, so far as I am aware, they are either not wholly effective, or are too costly to come into general use.

My invention consists in the use of cross-wire, formed with a series of eyes equidistant, through which the vertical rods or wires are passed, and by which said vertical reds or wires are all retained securely in perfect adjustment, equidistant, and in parallel lines, as will be' presently more fully explained. l

Toenable those skilled iu the art to make and use myinvention, I will proceed to describe the construction and operation of one of my improved screens, referring by letters to the accompanying drawings, in whieh Figure 1 is a front elevation, and

Figure 2 a. cross-section (at a: x, iig. 1) et' one of my screens.

A. is the frame or body, made of wood generally, in vthe usual form. bb, Sie., are the 'vertical wires or rods, v

which are arranged equidistant, as shown, are secured at their ends in the upper and lower portiensoi' the frame A, and pass through and are retained laterally in position by the cross-wires c e, 82e. .These cross-wires c c are formed with series of eyes or loops, as clearly shown, which are of the proper size and shape to accommodate the vertical rodsb b, .which pass through t-hem.

I have shown three of these-crcss-wires, but a greater or less number may be used, as deemed expedient.

These Wires c c may be made by inachinery, in given lengths, and afterward cut up to suit the size of screen to be manufactured, and be put and fastened in the frame A in any desirable manner.

fff are cross-bars, put into the frame, and arranged immediately behind the vertical bars b, and close to the eyed wires c, and they serve to back or stiften the wire-work. Ihey may be made removable if deemed expedient. l

It will be seen that by forming the wire-work of a screen in the vmanner described, with eyed cross-bars c7 made with equidista-nt loops, and vertical rods or wires passed thro-ugh them, the vertical bars I1 are readily placed in parallel equidistant lines, and are kept in perfect adjustment, while` at the same time, the whole fabric is simple, light, economic of construction, and durable.

vWhere it may be deemed advisable, or the slenderncss of the vertical rods require it, additional cross-bars fmay be employed, to give additional rigidity to the screen, and prevent the bending of the rods b.

It will also be observed that, by making the sc reen ot'v eyed cross-wires c, with the vertical rods passing through them, there is but little space obstructed, and the whole effective screening-surface is increased over j that obtained by the usual mode of manufacturing, in which other devices are employed to hold apart the vertical rods.

If desired, the cross-wires may be arranged with nuts on their ends, so that they may belstrained or tightened up, as circumstances require.

Having explained my invention, so that one skilled in the art can make and use it, what I claim as new, and desire to secure by Letters Patent, is- A The combination, with the frame and straight vertical rods, of cross-wires, formed with cquidistant eyes or loops, through which the vertical rods pass, and by which they are retained laterally, all substantially as and for the purposes described.

In testimony whereof, I have hereunto set my hand and seal, this ninth day of December, 1867.

' ROBERT McMURRAY. [L 5.]

Witnesses: C. A. Soorr, ANDREW Dn Laer.

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