Патент USA US2135100код для вставки
‘Nov. 1, 1938. 2,135,100 c. A. CAMPBELL FILTER Original Filed OCt. 15, 1937 N15 ‘y 3nventor Bu (Ittomegs Patented Nov. 1, 1938 2,135,100 UNITED STATES PATENT OFFICE 2,135,100 FILTER ‘ Charles A. Campbell, Watertown, N. Y., assignor to The New York Air Brake Company, a cor poration of New Jersey Application October 13, 1937, Serial No. 168,825 Renewed September 29, 1938. v 3 Claims. (Cl. 183-44) This invention relates to air ?lters and particu cotter pin 25 retain the ?lter disc in place, the larly to such devices intended for use in brake cyl hole for the cotter pin being so located that inders or the like. The invention, however, is plate IT is slightly sprung or dished, and hence susceptible of use in ?ltering air, where the ?ow serves as resilient means to compress the edges 5 occurs under moderate pressure, and where of the felt layers and produce a good seal on economy and ease of replacement are important rim M. factors. The construction has several advantages. The In the air brake art it is now standard practice ?lter unit is simple to construct, has a long life, to apply a breather to the guiding head (some and is protected from water and from vandals. 10 times called the non-pressure head) of the‘brake The ?lter disc itself includes the resilient means 10 cylinder, .and to protect this with a ?lter so that used to seal the ?lter to its seat and is adequate the entrance of dust and cinders isminimized or to maintain the seal throughout the life of the prevented. The present invention provides a disc. The only machining required is the opera ?lter which is inexpensive to construct and easy tion of drilling the hole for bolt 23-—all other 15 to ?x in position. parts receiving their ?nal form in the casting The invention will now be described by refer ence to the accompanying drawing, in which; Fig. l is a half elevation of a brake cylinder partly broken away to show the location and con 20 struction of the ?lter. Fig. 2 is a face view of the ?lter shown in Fig. 1. , . Modi?cations are possible. The use of two layers of felt of different textures is preferred but not essential, and other foraminous plates may be substituted for the woven wire cloth described. The manner of mounting bolt 23 may be modi?ed. What is claimed is,— Fig. 3 is a section on the line 3--3 of Fig. 2. ‘ Fig. 4 is a section of the front head of the brake 2 operation. cylinder, looking downward relatively to Fig. 1. In Fig. l the brake cylinder is indicated at 6, 1. The combination of an enclosing member having a breather port, and an annular seat sur rounding said port; a drip ring for resisting the 25 entrance of water through said port; a retaining the rear or pressure head at ‘I, the front head at ‘ pin substantially concentric with and normal to 8, the piston rod at 9. This rod is attached to piston I I and is guided in the front head 8. The 3 O piston return spring is shown at I2. These parts may be of any usual construction except that the front head 8 is provided with a breather port and ?lter seat which will now be described. The head 8 is provided with an outwardly 35 convex bulge I3 surrounded on the inner side of the head by a circular seat rim I4 to receive a disc shaped ?lter unit. ‘ This unit is made up of_ a layer I5 of coarse fabric, preferably felt, and a layer I6 of ?ner fabric preferably also felt, 40 backed by a foraminous metal plate I‘! preferably of woven brass wire. The parts I5, I6 and H are stitched together by means of spaced wire staples I8. These pass through both layers ‘of fabric and the foraminous plate I1 and are 45 clinched, as indicated. There is a central per foration 20 as indicated in Figs. 2 and 3. the plane of said seat; a ?lter unit encircling said pin and engaging said seat, said unit comprising a disc of fabric ?ltering material and a resilient plate-like foraminous backing; and retaining 30 means reacting between said pin and plate and de?ecting the plate to develop elastic sealing stress between the unit and the seat. 2. The combination of an enclosing member having .a breather port, and an annular seat sur rounding said port; a retaining pin substantially concentric with and normal to the plane of said seat; a ?lter unit encircling said pin and engag ing said seat, said unit comprising a disc of fabric ?ltering material and a resilient plate-like foraminous backing; and retaining means react ing between said pin and plate and de?ecting the plate to develop elastic sealing stress between the unit and the seat. 7 45 3. A self-sustaining ?lter unit comprising a The bulge I3 forms a chamber I9 surrounded by ‘resilient foraminous metal backing plate and a circular rim I4, and from thischamber leads the porous fabric facing attached together, said fac breather port 2I below which is a drip rim_ 22. ing being adapted to seal on its peripheral mar 50 A pin or bolt 23 is driven through a drilled hole ginal area against an annular seat and said plate 0 in bulge I3 and makes a drive ?t therein. The being arranged to be stressed at its center to de hole is so located that bolt 23 is normal to the velop an elastic sealing pressure upon the sealing plane of circular rim I4 and concentric there-' area of the facing when in use, such plate having with. su?icient rigidity to retain approximately its Bolt 23 passes through hole 20 in the ?lter original unstressed form while stressed to develop 55 55 disc, which disc is mounted with layer I6 against such elastic sealing pressure. rim l4 and plate H on the back (i. e. on the inner side relatively to head I3). A washer 24 and CHARLES A. CAMPBELL.