US1778558A - Screen for separating apparatus - Google Patents

Description

Oct. 14, 1930. c. e. KELLOGG SCREEN FOR SEPARATING APPARATUS Filed March 21, 1928 awuemtoa Patented Oct. 14, 1930 UNITEDSTATES PATENT OFFICE CHARLES G-FKELLOGG, OF SPRINGFIELD, OHIO, ASSIGNOR TO THE BAUER BROTHERS COMPANY, OF SPRINGFIELD, OHIO, A CORPORATION OF OHIO SCREEN FOR SEPARATING APPARATUS Application filed March 21, 1928. Serial No. 263,482.

This invention relates to improvements in separating apparatus in which removable screens are employed, and it more particularly relates to the construction of the screening elements.

An object of the invention is to provide shaker screens which are simple in design, economical in construction and effective for the purpose for which they are intended; a more specific object being to construct the screen and its frame of sheet metal as an integral unit.

In the accompanying drawing:

Fig. l is a plan view of a shaker screen in which my improvements are embodied.

Fig. 2 is a section on the line 2-2 of Fig. 1.

Fig. 3 is an enlarged fragmentary section on the line 33 of Fig. 1.

Fig. 4 is an enlarged fragmentary section on the line 44 of Fig. 1.

Fig. 5 is an enlarged fragmentary bot-tom plan view.

Fig. 6 is an enlarged fragmentary plan view.

Fig. 7 is a partial side elevation, in partial section, and reduced scale, of an apparatus in which my improved screen is embodied.

Fig. 8 is a section, in reduced the line 8-8 of Fig. 7. r

Fig. 9 is a reduced-scale plan view of a modification of my invention.

Heretofore it has been the customary practice in separating apparatus to attach the screening element proper to a wooden sash by screws, bolts or similar devices. It has also been the practice in order to accommodate the apparatus to a wide variety of materials, to keep in stock a suflicient number of screening elements with perforations of different sizes and disposition to adapt the apparatus to the particular work to be performed, making it necessary to remove the screening devicefrom time to time and substitute others. This change has been made either by removing the screen proper from its frame and attaching another screening element to the same frame at an expenditure of considerable time in making the scale, on

change, or by having a separate frame for each screening element, the expense of which is considerable. To reduce the labor and expense resulting from such construction, I have formed thescreen and its sash framing integrally of sheet metal. In Fig. 1, a flat plate, 1, preferably of sheet metal having a plurality of perforations 2, in the present instance circular in shape, and having relatively wider margins than heretofore employed, is notched at the corners, as shown in Fig. 6. Each margin is given two right angled bends, one, forming a bottom flange 3, being bent in a horizontal plane, along the dotted lines 3, and a second, forming the vertical web 4,..along the dotted lines 4, the previous notching permitting a mitre joint, as shown in Fig. 5. Brace members 5, preferably of sheet metal, in the present case angular in section, are secured by spot welding or other means to the bottom side of the screen 1, being so disposed that the short leg .5 of the brace 5 shall blank or cover the minimum area of screening perforations.

Referring to Fig. 7, an apparatus of a well-known type is shown which employs shaker screens of the character to which I have referred, having a sloping shaker frame 6 pivotally supported on pivoted hingers 10 permitting a reciprocatory motion. A plurality of removable shaker screens 1 are placed in the shaker frame on ledges 6, and forced one against the other by end screws 7 against a head piece (not shown), lugs 8 serving to clamp the separate screens in place.

In Fig. 9 is shown a modification of my invention, it being a screen adapted to being placed preferably at the higher. end of the shaker frame, the material to be screened be ing fed on the imperforate portion 9 froma hopper (not shown), this portion 9 serving to act as a spreader to' give uniformity in depth of the material as it approaches the perforations.

By this construction it will be seen that a simple and inexpensive screening unit is provided which eliminates the necessity of changing the screens proper on the Wooden frames or the necessity of providing a wooden frame for each screen element where a variety of such elements are employed.

Having thus described my I claim:

1. In a separating apparatus, a screen formed of a single piece of sheet metal having its inner portion provided with perforations and its outer portion. imperforate, with. its outer portions bent at right-angles to form downwardly-extending webs, the webs having their free edges bent at right-angles to form horizontal flanges, and a sheet metal brace secured to the lower side of said screen between two webs thereof, the side webs and their bent edges acting to support the element on a frame, leaving the approach to the upper surface of the element unobstructed and the end webs acting as abutments.

2. In a separating apparatus, a screen formed of a single piece of sheet metal having its inner portion provided with perforations and its outer portion iinperforate, with its outer portions bent at right-angles to form downwardly extending webs, the webs having their free edges bent at right-2 gles to form horizontal flanges, and a sheet metal brace having a horizontal flange bent from its up per edge, said flange being secured to the under side of the perforated portion of said screen between two Webs.

3. In a separating apparatus, a combined screening element and sash formed from a single piece of sheet metal, said sheet of metal invention,

* having perfo 'ations in its inner portions with its outer portions imperforate, said sheet also having its corners notched, vertical webs formed by bending the sides of said metallic sheet downwardly at right-angles, inwardly extending horizontal flanges formedby bending the free edges of said webs at right-angles, said notches permitting the ends of the webs and horizontal flanges to coincide, the side webs providing for supporting the elements on the frame so as to leave the approach of the upper surface thereof unobstructed and the end webs acting as abutments.

4:. In a separating apparatus whic has a shaker frame, a combined sereenig and sash of a self-sustaining character forme L from a single piece of sheet metal, the metal bein bent downwardlv at right angles along all or its edges for stirrenir; purposes and to provide for supporting the element on the shaker frame so as to allow it to be readily removed therefrom, leaving the ap. 1 t the upper surface of the screening ele obstructed.

5. In a separating apparatus hav r shaker ttrame, a combined screening- 1 i and sash of a self-sustaining characte formed from a single piece of sheet metal, the metal being bent downwart ly along all of its edges at right angles to form webs and the free edges of the webs being 'bent in-

Images