US1694019A - Gravity chute - Google Patents

Description

Dec. 4, 1928. 1,694,019 c. G. PFEIFFER GRAVI TY CHUTE Filed'OCt. 24, 1927 WITNESSES UWENTO I n K BY Umrzazz a;

A T TORNE YS angles.

Patented D ec. 4, 192,8.

UNITED STATES PATENT/OFFICE;

CIIARLEs- G. PIEIEEER, or PHILADELPHIA, PENNSYLVANIA, VAssIGNoR To SPECIALTY ENGINEERING COMPANY, or PHILADELPHIA, rENNsYLvANIA, A VCORPORATION OF PENNSYLVANIA.

Application filed October 24, 1927.

This invention relates to gravity chutes, more particularly to those of a spiral type useful in coiiitinuously conducting granular or pnlverulentmaterials such as coal, gravel, sand, powder, etc., from higher to lower levels.

The aim of my invention isto provide a compact conveyor of the` above character composed of interchangeable volute sections adapted to be secured together end for end and so configured transversely as to form, when assembled, a structure which is entirely self-sustaining, i. e. capable of' maintaining its integrity without requiring either an axial column or pi lars externally thereof to support it against sagging or `collapsing under load. Y

rllhe advantages accruing to my invention will bemaniii'est Jfrom the detailed descrip-tion of the typical yembodiment shown in the drawings whereof, Fig. I is a planview of the spiral chute.

Fig. II is, an elevation of' the same; and

Fig. III is a detail illustration showing the transverse configuration of the volute sections of which the structure is made up.

As hereindepicted, my improved spiral chute embodies a multiplicity of interchangeable volute sections 5-5 which are troughed to the angular configuration shown in Fig. III to provide the conveying channel or raceway G. The bottom 7 of' the raceway 6 is inclined somewhat to the horizontal7 upward from its inner spiral edge at 8. The upstandng flange `9 of the trough meets the bottom 7 in a well rounded curve 10 with avoidance of sharp corners and in'ipositimi of undue restraint against the free `flow of the` material in the trough. Along the inner spiral edge S, each section 5 is provided with an integral drop lflange 11, for a` purpose to be later on explained. As shown in Fig. I the sections 5--5 extend over a quadrant and meet end to end along radial planes at right At their ends, the sections 5 are moreover provided with integral securing flanges 12, 12 adapted to abut in the juncture planes and Vwhich extend inward into Inergence with the drop flanges 11. As shown, the abutment flanges 12, 12 are pierced at suitable intervals for passage of' the securing` bolts 13.

GRAVITY CHUTE.

Serial No 228,290. f-

When the several component sections 5 of the chute are assembled and secured together In the manner explained, it will be apparent that the drop flanges 11 )ointly constitute a `spiral stiii'ening internally of' the structure while the abutting flanges vl2, 12 serve, at the same time, to brace it transversely. In practice a sufficient number of the Vsections 5 are joined together to forni a raceway of the desired height, whereupon the end sections are secured to the upper and low-er levels between which the material is to be conveyed,-no other support or scaffolding being necessary to sustain the structure against collapse under load by virtue of the longitudinal and transverse bracing afforded `by the flanges 11, 12.

I have thus provided a spiral conveyor-` which is extremely simple in construction; very economical to manufacture; and easy to erect. The'structural simplicity characterist-ic of my invention is also conducive to. ready replacement of sections which have become badly worn after extensive usage, so thatupkeep expenses are reduced to the very minimum. n

Having thus described my invention, I claim: Y

1. A spiral gravity chute embodying interchangeable angularly-troughed volute scctions adapted to be secured togetliertcnd for end, said sections having integrally-formed depth `flanges iointlyconstituting a. spiralizcd stiflening whereby the structure is rendered self-sustaining under load. I

2. A spiral gravity chute embodying intercl-iangeable angularly-troughed volute sections ada'pted to be secured together end for end, said sections having integrally formed depth flanges at their inner edges jointly coni stituting a spiralized internal stiftening whereby the structure is rendered self-sustaining under` load.

3. A spiral gravity chute embodying interchangeable angularly-troughed volute sections integrally formed with end securing ilanges adapted to abut radially of the chute structure and to brace it crosswise, and depth fianges intersecting with said securing flanges to constitutel a spiralized stiflening whereby the structure is rendered self-sustaining under load.

1. A gravity chute embodying interchangeable angularly-troughed volute sec-.tions kwith integral end securing flanges adapted to abut radially of the chute Vstructure and brace it crosswiae, .as Well lal; with integral depth flangesatwtheir innerfedges that `ninelrsaeot with the radial flanges `aforesaid and constitute a spralized internal stfening `whereby the structure is rendered self-sustaining undef load.

In testimony whereof, I have hereunto 10 signed my name at Philadelphia, Pennsyl- Vania, this 19th day of October, 1927.

Y CHARLES G. 1am IFFER`

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