US1167927A - Sieve. - Google Patents

Description

C. F. PFALZGRAF.

SIEVE.

APPLICATION FILED FEB. 18. 1915..

Patented J an. 11, 1916.

COLUMBIA PLANocnAPl Co..WAsMlNG-.'0N. D. a.

UNM

CHARLES F. P FALZGRAF, 0F BALTIMORE, MARYLAND.

SIEVE.

Application filed February 18, 1915.

T0 all 'whom t may concern:

Be it known that I, CHARLES F. PFALZ- GnAF, a citizen of the UnitedStates, residing at Baltimore, in the State of Maryland, have invented certain new and luseful Improvements in Sieves, of which the following is a specification.

This invention is an improvement in circular wire sieves of that type in which the woven-wire that forms the bottom of the sieve is secured to a sheet-metal ring that forms the sides of the sieve.

The object of the invention is to provide below the woven-wire bottom of such sieves an improved construction of cross-bar means to assist in sustaining the said wovenwire and prevent sagging.

The improvement is illustrated in they drawing herewith in which,"

Figure 1, is a top plan view of a circular sieve in which a portion of the wovenwire bottom across the center is shown broken away to better expose the cross-bar means. Fig. 2, is a bottom plan view of a small portion of a sieve showing one of the cross-bars. Fig. 3, is a vertical cross-section of the downward-projecting joint that unites the sheet-metal ring, the woven-wire bottom, and the hooked end of a cross-bar, the view being taken on the line 3 3 of Fig. 1, but drawn on a larger scale. Fig. 4, is a perspective view of an end of one of the cross-bars.

Referring now to the drawing the circular sides of the sieve comprise a sheet-metal ring 5, which in cross-section has a circular or ring-shaped foot 6, and a concavo-convex base 7. above the foot, and whose upper part 8, is slightly flared.

The woven-wire bottom 9, has the usual circular or disk shape, and its rim-edge is turned down to form a flange 10. that is secured in thejoint shown in Fig. 3. The joint also serves as a ring-shaped foot 6, the sheet-metal inwardly of the concave-convex base 7, has the form in cross-section of a loop that depends below and serves as already stated as a foot, the top of the loop is open when the several parts are first assembled and at the inner side of the open top is a horizontal annular flange 11, projecting inwardly. I provide two thin flat sheetmetal bars 12. that are crossed and placed below the said woven-wire 9; each bar has at both ends a hook 13, which is first bent at a right-angle downward with respect to the Specification of Letters Patent.

Patented Jan. 11, 1916.

Serial No. 9,028.

horizontal plane of the thin flat bar 12, and then curves at 1,4, and its point-end 15, projects upward; the entire hook is below the said horizontal plane of the bar.

The curved bottom 111, of the hooks, four in number in the present instance, seat down into the open loop 6, and each hook is temporarily retained by an indentation 16, produced at the inner side of the loop 6, see Fig. 8, by the end of a punch took-'and said indentation forcing the metal of the loop into a depressionen the downwardbent part of the hook. This indentation 16, in each of the hooks, retains them from coming out of the said open loop 6, while the sieve is undergoing the several linishing operations. The rim-edge or flange 10, of the wire disk also takes down into said open loop 6, and into the hooks 13. The upwardturned ends of the hooks are relatively only about half as high as the down-turned flange, 10, of the woven-wire disk, as seen by reference to Fig. 3.

When the rim-edge 10, of the woven-wire disk, and the hooks 13, of the cross-bars are properly assembled in the sheet-metal loop 6, these parts are then compressed by the action of rollers or otherwise` forming an annular indentation around the outer side of the ring-shaped sheet-metal loop forcing the metal inwardly directly above the pointends, l5. of the hooks which are within said loop. This annular indentation shown in Fig. 3 at the left-hand side of the loop-foot, 6, closes the open top of the loop and sets all the parts in a permanently fixed manner.

This construction places the upper flat surface of each crossed bar 12. in close contact with the lower surface of the wovenwire disk 9, and thereby said flat bars are better able to sustain the woven wire and prevent it from sagging when the sieve is loaded with material. such as flour.

Having thus described my invention what I claim is,-

' 1. A circular sieve having in combination, a woven-wire disk with a down-turned rim Harige; a sheet-metal ring-shaped wall higher than and surrounding said disk and said metal also forming a hollow ringshaped foot below the disk; a plural number of thin flat sheet-metal bars in contact with the lower surface of the woven-wire disk the bars being crossed at the center and each bar provided at both ends with a hook whose point-end. projects upwardly said. hooks being seated within the hollow part of said.

foot andv also in the said upwardly-project-Y ing hooks, and an annular indentation formed around the ring-shaped foot and compressing the sheet-metal directly in contact with said woven-wire rim fiange imme* diately above the point ends of the upwardly turned hooks, said-compressed indentations causing tlievhools to grip the Woven-wire flange.

2. A circular sieve consisting of a sheetinetal ring-shaped wall and an integral ring-shaped foot which in cross-section is in the form of a loop longer vertically and at the top ofwhich is an inwardly-projecting horizontal annular flange; a plural number of 'flat sheet-metal bars crossed at the center each bar having at both ends an upturned vhook and all the hooks being seated within the said loop-shaped foot, and the fiat horizontal part of each bar resting on said'inwardly-projecting horizontal flange; and a woven Wire disk whose rim-edge is in the 'f said loop-shaped foot and said disk resting on the flat horizontal tops of said bars.

In testimony whereof l affix niy signature in presence of t'wowitnesses.

PoRTER H. FLAUTT, BERTHA K. VALTER.

Copies of this -patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C.

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