US2846022A

US2846022A - Filter mat holder

Info

Publication number: US2846022A
Application number: US554551A
Authority: US
Inventors: Arthur F Hubbard
Original assignee: American Air Filter Co Inc
Current assignee: American Air Filter Co Inc
Priority date: 1955-12-21
Filing date: 1955-12-21
Publication date: 1958-08-05
Anticipated expiration: 1975-08-05

Description

Aug. 5, 1958 'A. F. HUBBARD Y 2 FILTER MAT HOLDER FiledDec. 21, 1955 Q Q Q %Q /8 Q Q 5 Q Q Q Q Q Q 2 FlG.l

/9 II II E I 0-;15 I FIG.2 [2 E o I6 i FIG. 4

'4 6 INVENTOR.

FIG. 5 ARTHUR EHUBBARD BY MW ATTOR N EY United States Patent FILTER MAT HOLDER Arthur F. Hubbard, Moline, Ill., assignor to American Air Filter Company, Inc., Louisville, Ky., a corporation of Delaware Application December 21, 1955, Serial No. 554,551

2 Claims. (Cl. 183-49) The present invention relates to an improved frame for holding air filter mats.

Filters of the met or pad type are generally held in a vertical plane in a frame provided with a foraminous front cover and a foraminous rear wall, which allow passage of air through the filter pad. The cover, or rear wall of the frame may have horizontal spikes which become imbedded in the mat when the mat is inserted so as to prevent sagging of the mat but they do not prevent the mat from falling out of the frame, so a cover is necessary to keep the filter pad in the frame. In operation, the mat, and the outer face of the cover of the frame become covered with lint and dust, and when it becomes necessary to replace or renew the pad, it is necessary to remove the soiled cover, replace the mat, and then clean the cover before it is replaced. The need to handle and clean the cover is objectionable, but so far as I am aware, the cover has been considered essential to hold the mat in place.

It is an object of the present invention to provide a coverless filter frame which effectively holds the filter pad in place, thus eliminating the cover and its objectionable dirt collecting propensities.

In accordance with the present invention the cover of the filter frame is eliminated, and the filter pad is held against falling out by a plurality of prongs or spikes extending horizontally from the upstream wall of the frame, the spikes being provided at their free ends with transverse upwardly directed barbs or hooks. When the filter pad is inserted in the frame, the spikes penetrate the mat, and the barbs hold the mat against falling out of the frame. The barbed spikes are arranged to also prevent sagging of the mat.

The spikes may be integrally attached to the downstream wall of the frame, or they may be attached in a manner permitting removal of the barb or spikes.

The invention will be described in greater detail in the following specification taken in connection with the accompanying drawing illustrating preferred embodiments by way of example, and wherein:

Figure 1 is a perspective view of the frame embodying the invention, as viewed from the open side with part of the mat broken away;

Figure 2 is an elevational view of a barbed spike prior to having its mounting end bent to form a hook;

Figure 3 is a plan view of a barbed spike having its mounting end bent to form a hook;

Figure 4 is a fragmentary view of a modified filter frame;

Figure 5 is a section taken on line VV of Figure 4, and

Figure 6 is a side elevation of Figure 5.

Referring to the drawing, Figure 1, there is shown a filter frame having a top 1, bottom 2, and two

side members

3, 4, forming a rectangle. The upstream wall 5 may be constructed of expanded metal, or may be formed in any other manner to permit passage of air therethrough, the downstream end 6 of the frame being open.

2 A filter pad 7 of matted, crossed or interlocked fibers, or filaments is inserted through the open end 6 of the frame.

The upstream wall 5 has disposed at suitable intervals, a plurality of spikes, prongs or tines 8, which are pointed or tapered so as to penetrate the filter pad when the pad is inserted into the frame. The form of spike illustrated, and shown in detail in Figs. 2 and 3 is made from a flat strip or ribbon of metal 9 tapered at its end 10, and pro vided with an upwardly directed transverse barb 11. This spike is attached to the upstream wall 5 by bending or folding the end 12 around the metal web of the expanded metal wall and crimping or folding the metal at 13 around the web to hold the spike in place. The spike is positioned so the barb is directed upwardly. A plurality of such barbed spikes are suitably arranged on the upstream wall of the frame.

In operation, when a filter pad is inserted in the frame the tapered prongs 10 penetrate the filter pad and the barbs 11 hold the pad in place so that it cannot fall out of place. That is, the function of the barbed spikes is to prevent the filter pad accidentally falling out of place, and incidentally, to prevent sagging of the pad.

To replace the dust loaded filter pad, the pad is lifted slightly to disengage the barbs, and is then drawn through the open end of the frame. Removal of the pad does not entail removal of any cover, as no cover is employed. A clean filter pad now is loaded into the open end by pushing it onto the barbs, and the loaded filter frame is inserted into the filter. It will be seen that the barbed spikes replace or eliminate the cover, so that replacement of a filter pad does not involve handling or cleaning a dirty cover.

In the modification shown in Figs. 4 to 6, the downstream end of the filter frame is provided with spaced bars or channels 14, which allows air to fiow through the frame, and to these bars are welded at suitable positions the barbed prongs 15. The barb on the prong is formed by bending the free end of a rod into the form of a hook at 16, and sharpening the hook.

I claim as my invention:

1. A holder for a filamentous air filter mat comprising an open ended perimetric frame member of substantially U -shaped cross section and of a depth sufficient to peripherally enclose a filamentous filter mat of predetermined thickness insertable therewithin, an air pervious backing screen mounted in one open end of said frame member, and a plurality of selectively disposed barbed end prong members removably mounted on said backing screen and having the barbed ends thereof extending into the space defined by said frame member whereby a filter mat inserted into said frame member and into abutting relation with said backing screen is peripherally supported and retained by said frame member and selectively supported and retained at locations remote from said frame member by the embedded engagement of the barbed ends of said prong members therewith.

2. A holder for a filamentous air filter mat comprising an open ended perimetric frame member of a depth sufiicient to peripherally enclose a filamentous filter mat of predetermined thickness insertable therewithin, an air pervious backing screen having intersecting web portions mounted in one open end of said frame member, a plurality of prong members each removably secured at one end thereof to said intersecting web portions of said backing screen and having the other ends thereof projecting into the pad receiving space defined by said frame member and barbed means on said last mentioned ends of said prong members whereby a filter mat inserted into said frame member through the open end thereof and into abutting relation with said backing member is selectively Patented Aug. 5, 1958 thereon.

References Cited inthe file of this patrit UNITED STATES PATENTS Slayter et a1. May 30, 1939 Belsher Sept. 24, 1946 Davis Apr. 25, 1950 Palmer July 24, 1951 Shapirov Aug. 26, 1952 Rowe May 5, 1953 Lindner Oct. 4, 1955