US1211037A - Dust-guard. - Google Patents

Description

C. P. ASTROM.

DUST GUARD.

APPLICATION FILED MAY], 1914.

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C. P. ASTROM. I

DUST GUARD.

. APPLICATION FILED MAY 7, I914. 1,21 1,037. Patented 5311.2, 191?,

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CARL P. ASTROM, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO 1W. H. TREADWELL COMPANY, A CORPORATION OF NEW YORK.

DUST-GUARD.

Specification of Letters Patent.

Patentel Jan. 2, 1917.

Application filed May 7, 1914. Serial No. 836,840.

rangement of dust guard for journal boxes and the like, the especial object of the invention being the provision of a device of this character which will insure an exceedingly tight closure against the passage of dirt or fire into orout of the journal box and is so constructed that the bearings for the shaft entering the box may be removed and new ones substituted, thus giving the main portion of the guard a permanent character.

Further advantages of the improved dust guard lie in the fact that it may be constructed by stamping it from sheet metal, rendering the guard fireproof, easy and cheap of manufacture, and capable of easy application to the journal box and removal therefrom. V

A further object of the invention is the provision of .an improved bearing for the guard, constructed in sections and having the sections so joined that they are capable of inward movement to acconnnodatewearing away of the metal, and at the same time 'apractically impervious-joint is provided preventing the passage of fire, or foreign matter into the journal box at this point.

A full understanding of the invention will be obtained from the following description of a construction embodying the same,

taken'in connection with the accompanying drawings illustratlng lts several features in a preferred form and the scope thereof specifically. pointed out by the appended claims.

In the drawing, Figure 1 is a plan'of the improveddust guard; Fig. 2 is a side elevation of the same; Fig. 3, is a section through an axle box of the type employed in railway cars illustrating one mode of applying my invention; Fig. 4 is a view illustrating the parts of the dust guard separated to permit their application to the axle box; Fig. 5 is a detail of the improved bearing for the shaft or axle entering the box; and Fig. 6 is a fragmentary detail View of the lower portion of the dust guard.

In the form of my invention shown, the dust guard consists of a plurality of 00- operating interlocking sliding members 1 and 2 constituting a frame, adapted to receive the shaft. The guard carries removable grooved sections 1 and 5 of Babbitt or other suitable bearing metal. One section .4.- is detachably secured to the upper memher 1 of the frame, and the other section 5 similarly secured to the lower member 2 of the frame, so that when the two members are assembled the two sections unite to form a continuous bearing as shown in Fig. 3.

As stated, the two members constituting the frame may be constructed of sheet metal in such a manner that one of the members has an interlocking sliding connection with the other member. This is accomplished in the following manner: The upper member 1 comprises a plate having its central portion partially cut away from one end to provide inner side elongations 8 and 9, the inner edges of which merge into the central edge 7 of the substantially semicircular cutaway portion. These elongations are adapted to enter slots or grooves in the lower member 2 of the frame, when the parts are assembled. A filler plate 10 less in width than the plate 1 is secured to said plate in any constitutes a tongue adapted to receive a V groove in the bearing section 1 to retain it in place. The upper end of the plate 1 has its sides 14: and 15 beveled or sloping, and that portion of the metal at their junction bent at right angles to form a centrally located wing 16 to which is pivotally secured a leaf spring 17 as by rivet 18. The lower member of the frame is similarly constructed of stamped sheet metal plates and consists of parallel plates'19 and 20, separated by plate 29, each plate having its central portion cut away in the same manner as in the upper member 1 to provide side elongations 21 and 22 on the plate 19, and like elongations 23 and 21 on the plate 20. The bearing segment 5 has a groove which fits on plate 29, and plates 19 and 20 are cut out larger in order to receive the edges of the bearing 5. The elongations 23 and 24: extend beyond the elongations 21 and 22 and sure in one direction is thereby imparted to thelower member of the frame, and pressure their ends are bent at right angles forming shoulders 25, 26, under which the curved ends 27 and 28 of the spring 17 rest when the guard is assembled. Leaf springs 33 and 3%. having one end secured to one of the external plates, as 19, of one member rand berinto the grooves 31,32 and inserting the ends ofthe leaf spring 17 under said shoulders 25, 26. It will-be observed thatpresin the opposite direction to the; upper member, so that the two member's tend to con tract on the wheel shaft. This pressure is exerted at all times, and keeps the bearing metal .in'continuouscontact with the axle as the bearingmetal' wears away. The guard thus automatically accommodates'itself to changes 1n c rcumference due" to wearing away of the metal.

The mode of j ommg the two bearing sections is'such that they may bepermitt'ed the desired range of'movement above indicated and at thesame time form a continuous clo sure to prevent entry of dirt, dust and other foreign substances into'the interior of the box, or the exit of fire or combustible gases 7 from an overheated bearing. Such passage of gasesor flame through the inner 'SlClG of a box has been known to set a car on fire.

This is prevented cutting or notching the inner ungrooved portion of each section to provide notches or lugs' 35, 36, and completely cutting away the extreme ends so thata type of stepped scarf joint is formed.

' When the two sections are assembled the lugs of one member enter notches of the other member, permitting sliding of the section'sand at the sametime, maintaining a continuous closure around the axle at the inner side of the box. To' assist this, the outer side of the guard is made flush, so that it tightly fits against the outer shoulder 47 of the box. Y i

For purposes of illustration, 1 have shown j in Fig. 3 a mode of applying my dust guard to a car axle box of standard type. The axle boxconsists of a box frame 37 adapted to receive a suitable lubricant and its vehicle, for instance, tow or cotton waste. A hinged cover 38 normally closed by means of a spring 39 permitsaccess tothe box from the exterior. The car axle 40 projects into the box through the internal opening 11 and bearing; metal segments".

its journal 12 contacts with a brass43 held in place by a key 44: in the usual manner. A collar 45 at the end of the axle prevents longitudinal" slipping of-the brassduri-ng rota-- tion. In the rear of the axle box is provided a dust guard well 46 of usual type into which the dust guard is dropped before the axle is projected into the box. ,The upper section 1 of the dust guard is oined in interlocking-relation with said lower section 2 by sliding the elongations 8 and 9 into the grooves 31 and 82 in thelower member and passing the ends'of the leaf spring 17 under the shelves 2'5 and 26-inthe lower member. The'pressure of springs 33, 341 actsto press -'the sectionsofthe'bearing against the shoulder" 47 of the boxyand 'the spring 17 keeps the bearings 1, 5 infconstant contact with the axle asthe-1netal-wears-away=' While the axle is being inserted, the-parts-ofthe dust guard are held spread apart to permit the axle'endto pass through.

lt'will be'noted that I have thus provided 'a dust guard which is exceedingly simple in construction, easy-"tolmanufacture at a very slight-cost, and capable ofready and quick 7 application totliejournal box or other device with which it is associated-u r It will be seen thatth'e present invention provides not only 1 a self--contracting dust guard which performs the ordinary fune- Y tion I of excluding dust fromenteringthe bearing, and preventing-loss of oil from the bearing, but it is 'also fire-proof, and prevents escape 'of' hot combustible-gases or flames from-the-bearingitself,or passage of fire-intothe box- One contemplated use of this invention-is for cinder cars, where there is dangerwith ordinary boxes of setting-the bearings "on fire from hot 'cind-er.

frequently become overheated and take fire, and thesefires have *beenknown t'o communicateto the carbypassing through the inner side 'of--the'-box',*orgases escaping through 'the inner side of the box have: be

come ignited-, as from 1 hot cinder; andset fire *tothe; car or to the bearing. The pres- Railway bearings" W ent construction keeps the fire in the, box. r

A further advantage of thisinvention resides in the" provision of the U-shaped re newablebearingsegments 4: and 5. As these wear 'awayfthe-pieces will drop,-'-and can easily be removed," whichis a' distinction over a T-shaped bearing. metal segment which would leave the'sha n'k of-the T in the" slot'between the plates In thebroa'd aspect of the inventionf-T-shaped' bearing segments are" within' the scopaof this invention,

f equally .Wltll- 'the specific U-shaped-form shown. It will also -be"-observed that no rivets or fasteningsiare employed for the V A further'advantage of the construction herein described is that-thefront or outer side of the dust guard is substantially flush, so that it fits the shoulder 47 of the box, this shoulder being at present a standardized element in M. C. B. or other standard railway boxes.

It is to be understood that my invention is not to be limited to the exact details of construction herein shown, nor to the method of application which is shown merely for purposes of illustration, as the invention is capable of wide variation and considerable modification and may be adapted for other uses as well without departing from the spirit and scope thereof.

Having thus described my invention, what I declare as new and desire to secure by Letters Patent of the United States is l. A dust guard comprising a U-shaped member formed by a pair of spaced plates secured together, a. cooperating U-shaped member adapted to slide between said spaced plates, bearing segments carried by said members and spring means carried by one member and engaging the other to draw them together.

2. A dust guard comprising a U-shaped member formed by a pair of spaced plates secured together, a cooperating U-shaped plate member sliding between said plates,

bearing segments carried by said members and having their faces on one side in the fame plane with the side faces of the memers.

8. A dust guard comprising a pair of spaced U-shaped plates secured together, one of said plates having inturned ends, a cooperating member sliding between said spaced plates and below said inturned ends,

a spring between said member and said ends, and bearing segments carried by said member and said plates and pressed together by said spring.

4. A dust guard comprising spaced U- shaped plates secured together, a spacing member between said plates, a second member carrying a filler plate and sliding between said plates, a spring between said second member and said spaced plates, and bearing segments grooved to fit said members, said plates and bearing segments having their faces on one side in a common plane.

5. A dust guard comprising a pair of U-shaped plates secured together, a spacing member between them projecting into the space between their arms, a bearing segment grooved to fit the projecting end of said spacing member and engaging the edges of said plates, a second member sliding between said plates and carrying a second bearing segment, said second member and segments having their faces on one side flush with the side face of one of said plates, and a spring acting between said second member and said plates.

6. A dust guard comprising a member having projecting arms to straddle a shaft, shoulders on said arms, a cooperating member slidably engaging said arms, a spring carried by said cooperating member and separably engaging said shoulders for contracting said members on the shaft, and bearing segments carried by said members.

In testimony whereof I afiix my signature, in presence of two witnesses.

CARL P. ASTRQM. Witnesses:

J. S. Woos'rnn, G. N. KERR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of I'atents,

Washington, D. G.

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