US2447368A - Snubber - Google Patents

Description

Y Aug. 17 1948.

W. L. SCHLEGEL, JR., lET AL'v SNUBBER Filed Feb. 7. 1944 IN VEN TORS.

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Patented Aug. 17, 1948 SNUBBER Walter L. Schlegel, Jr., and Fred E. Beckman,

Chicago, Ill., asslgnors to American Steel Foundries, Chicago, Ill., a corporation of New Jersey Application February 7, 1944, Serial No. 521,310

y16 Claims. (Cl. 267-9) Our invention relates to a friction device or a snubber of the type commonly used in railway equipment in association with other spring supporting means and is o f-aV type suitable for application within a railway spring group in substitution of any standard spring. Our device, however, may be used in any suitable application Where it is desired to have a spring support with snubbing means or -friction absorbing means in association therewith. Our snubber combines a spring support and friction means therewithin.

The general object of our invention is to devise such an arrangement as that described, wherein Van arrangement eminently suitable for the use of composition friction shoes may be devised and comprises a, top followerr having a friction barrel and a bottom follower having yoke means supporting composition friction shoes within said barrel for Yfrictional engagement therewith and resilient means under compression between the shoes at opposite sides of the device. Y

A different object of our invention is to devise such a snubber wherein a pair of friction shoes may be supported from one follower within a frictionbarrel carried on an opposite follower with coil springs compressed between the shoes at opposite sides of the device, and the shoe supporting follower comprising a yoke with shoe carrying means arranged in a plane approximately at right angles to the plane of the yoke.

In the drawing,

Figure 1 is a side elevation of our novel friction device, half in section, the section being taken in the Vertical plane bisecting the device approximately as indicated by the line I-I of Figure 2.

Figure 2 is a, top plan view;of the `structure shown in Figure 1, half in section, the section being taken approximately in the horizontal plane indicated by the line 2-2 of Figure 1.

Describing the structure in detail, our top follower 2 is illustrated as a built-up member comprising a base plate 4, chamfered about its perimeter as at 6 to accommodate rocking thereof where desirable, and centrally perforated vas at 8 to afford positioning means for one end of the device. To the base plate 4 may be integrally secured, as by welding at I0, the friction barrel I2, the upper end of said barrel having a cham-fered extremity as seen Aat I4 to accommodate said welding VICI' about the perimeter thereof. The friction barrel I'2 may have a continuous friction surface I6 therewithin and said barrel may project within the compression spring I8, one end of which may seat as at 20 against the base 4 of the topV follower and the opposite end of which may seat as at 22 against the base 24 of the bottom follower, said base 24 of the bottom follower, generally' designated '26, being chamfered about its outer perimeter as at 28, similarly to the top follower, and cored out to form the central opening affording positioning means therefor where desirable. l

It will be understood that under railway service conditions, a snubber is frequently inactive for. considerable periods of time and under weather' conditions which cause rusting and corrosion of ordinary metallic parts. For this reason the barrel I2 may be composed of stainless steel which will notv rust or corrode inasmuch as it 'is desirable that the surface I6 be at all times-in relatively smooth condition in order to prevent excessive wear and abrasion of the compositionshoes which are contemplated in our novel design.

The bottom follower 26 may have anV integral yoke 32 projecting upwardly therefromand extending within the barrel I2 of the top follower to support therewithin a pair of diametrically opposed friction shoes 34, 34 in frictional engagement as at36 with the barrel I2, said barrel I2 having a, cylindrical inner' friction face and each of the shoes 34 being formed with a friction surface 3B 'complementary thereto. Each friction shoe 34 may have on its fiat inner face, 40 a plu-l rality of outstanding .lugs .42, 42, each affording positioningV means fora, .plurality of outer and inner auxiliary springs, respectively designated 44 and 46, said springs bearing at their opposite ends against the respective shoes at opposite sides of the device and acting to urge said shoes vinto engagement with the friction barrel I2. Each friction shoe 34 may be formed with a trans.- verse. slot 48 at the top thereof and a corresponding slot 50 at the bottom thereof, said top slot 48 accommodatingthe lug 52 projecting from the top portion 54 of the yoke 3'2, said lug 52 being arranged approximately at rightv angles to the plane of said yoke.V

` The slot 50 at the bottom of each shoe 34 may receive the rectangular top portion 56 of the 'lug 58, said top portion 56 conveniently affording a. seat for the bottom of the shoe yand the lugs 58, 58 being integrally formed with the bottom fo'llower 24 and positioned in a plane approximately at right angles to the plane defined by the yoke `32.

It will thus be seen that the Vbottom follower assembly -comprises the follower base 24, the yoke 32, and shoe support studs 58, 58 at opposite sides of said yoke in a plane approximate-ly at right angles to the plane of the yoke, said 'studs affording support me-ans for friction shoes at opposite sides of the device, each shoe being confined between one stud and a lug 52 at the top of the yoke and each shoe having positioning mea-ns for auxiliary springs carried within said yoke between said shoes. This whole bottom follower assembly may be handled as a unit for application. wit-hin. the friction. barrel of the top follower around which may be carried the main compression spring I8. It will thus be observed that we have` provided a compact novel arrangement particularly suitable for the purpose intended and conveniently arranged for the use of friction shoes of compositi-on material comparableto that. normally used in automotive brake lining-s comprising a. matrix interspersed with particles producing a scouring action on an associated braking surface,

the structure and arrangement of the parts being` such that said shoes are-subi ected to compression on1y whether it be as a result of the auxiliary springs urging said shoes into: engagement with the friction barrel or. as a result of. compression and release of the device proper when the shoes are actuatedv or carried along between the lugs at .the top of ythe yoke on the bottom follower and their respective support studs. Itv may also be noted that this bottom follower assembly is such that thel rotation thereof within the top follower is. permitted and the rotation of one part, such as a; friction shoe, wi1I carry with it the entire bottom follower assem-bly so. that misalignment of the parts ofsaid bottom follower assembly is prevented.

It is to be understood. that we do not wish to be limited by the exact modification of the device shown which is merely by Way of illustration and not limitation as various and other forms of the device will, of course, be apparentto those skilled in the art without departing from the spirit of the invention or the scope of the claims.

We. claim:

1. In afriction absorbing` device, a top follower comprising a base plate and a friction barrel depending therefronr said barrel comprising an internal' friction surface, a bottom follower co1npri'sing a base and a yoke projecting upwardly therefrom, lugs on opposite sides of said. yoke at the upper extremity thereof, each of saidslugs Ipresenting a substantially horizontal shoe abutmentsurface, studs projecting upwardly from said base at opposite sides of said yoke and spaced therefrom, each of said studs having 'at its upper extremity a, horizontal shoe abutment face in alignment with the adjacent abutment surf-ace, a pair of spaced friction shoes engaging said friction. surface, resilient means under compression between said shoes, each of said shoes having a recess at its upper extremity receiving one of said lugs and a recess at its lower extremity receiving one of said studs, said shoes having substantially horizontal bearing surfaces ensageable with respective abutment surfaces and abutment faces, and aspring sleeved over said barrel and seated against said .base plate and said base.

2.v In a friction absorb-ing device, a top follower comprising a base plate anda stainless steel friction. barrel depending therefrom .and welded thereto, `said ,barrel comprising an internal friction surface, a bottom follower comprising a base and. a yoke projecting upwardly therefrom, lugs on opposite .sides of said yoke at the upper extremity thereof,y each of said lugs presenting a substantially horizontal flat shoe abutment surface, studs. projecting from said base at opposite sides of said yoke, each of said studs having at its upper extremity a substantially horizontal flat shoe abutment face, a pair of spaced composition fric- -tion shoes engaging said friction surface, resilient means under compression between said shoes, each of said shoes having a recess at its upper end receiving the adjacent lug for interlocking engagement therewith and havingv a recess at its lowerI extremity receiving the adjacent stud for interlocking engagement therewith, and a spring sleeved lover said barrel, said spring being seated at opposite ends thereof against said base plate and said base respectively.

3. A friction absorbing device comprising -a basefplate. a friction barrel of noncorrosive metal connected' tosaidplate, said barrel comprising an internalV friction surface, spaced composition frictieni-shoes: engaging" said surface, a plurality of springs under compression between said shoes and spaced axially of said barrel, a follower comprising shoe carrying means including spaced bearing surfaces cooperating-with the inner and outer extremities of' each shoe, and spring means sleevedI over said' barrel and reactingv against said plate and said follower for yieldingly resisting compression of the device.

4. A device, according toclaimy 3`-, whereinthe shoes andthe bearing surfaces are in tong-ue and groove engagement to prevent rotation of said shoes in said barrelY relative tosaid follower.

5. A friction absorbing device comprising a oa-se plate, a friction barrel connected thereto; a follower including-a base anda yoke extending from said base into said barrel, said yoke comprising' lugs at its inner end, stud-s on saidv base aligned with respective lugs, friction shoesV confined be'- tween said lugs and studs, spring means within said yoke for urging said shoes into frictional engagement with said barrel, and spring means sleeved over said barrel and' reacting between said plate and saidv base for yieldingiy resisting compression ci the device.

6. In` a friction absorbing device, a follower comprising a base plate and4 a friction barrel of n-oncorrosive metal connected thereto, said barrel comprising an internal" friction surface, spaced composition friction shoes engaging said surface, resilient means under corrnrn'essionl between said shoes; another follower comprising shoe carrying means, said shoe carrying means including spaced bearing surfaces cooperating with the topand bottom extremities of each shoesand a substantially verti-cal spring sleeved over said barrel and bearing against said plate and against abutment means on said second-mentioned follower.

7. A snubber comprising atop follower having a cylindrical friction barrel of stainless steel, a compression spring, and a reciprocating assembly comprising a bottom follower having a slotted yoke extending within said' barrel, shoe actuating meansV at the upperr'end of said' yoke projecting at right angles from the plane thereof', shoe supporting studs on said bottom followerA in the vplane of said lugs, composition friction shoes supported between said studs and lugs and interlocked therewith, said studs and lugs having vertically aligned parallel bearing surfaces cooperating with the top and bottom extremities of respective shoes,

:and auxiliary springs compressed between said shoes within said. yoke, the composition shoes being formed of a matrix interspersed with particles capable of `producing a` scouring action .on alien gagedsurface of saidbarrel.

8. A friction device comprising a base plate, a friction barrel of n-oncorrosive metal connected to said plate, said lbarrel having an internal fricannees tion surface, spaced composition friction .shoes engaging saidsurface, resilientzmeans under .coinpression between said shoes for'urging the saine againstsaid surface, a. follower comprising'sh'oe carrying means includingspacedbearing surfaces cooperating 'with the :inner and outer extremities yof each -shoe4and spring means sleeved over said barrel andgreecting against said Aplate and follower for yield-ingly resisting -coinpressionv'of 9; A lfriction vdevice .comprising abase plate, la frictionbarrel .connected thereto, a follower in@ -cluding a base and a yoke extending from said base into said barrel, said yoke comprising lugs within the barrel, studs on the base aligned with respective lugs, a plurality of friction shoes each confined between and engageable with one of said lugs and one of said stud-s, a plurality of spring means within said yoke spaced axially of said barrel and compressed between said shoes fior urging the latter into frictional engagement with said barrel, and spring means sleeved over said barrel and reacting between said plate and said base for yieldingly resisting compression of thev device.

10. In a friction absorbing device, a follower comprising a base plate and a friction barrel of non-corrosive metal weld-ed thereto, said barrel comprising an internal friction surface, spaced composition friction shoes engaging said surface,

resilient means under compression between said shoes, another follower comprising shoe-carrying means, said shoe-carrying means including spaced bearing surfaces cooperating with the top and bottom extremities of each shoe, and a substanrtially vertical spring sleeved over said barrel Iand bearing against said plate and 'against abutment means on said second-mentioned follower, said shoe-carrying means including a hollow yoke confining said resilient mean-s.

11. l'n a friction absorbing device, =a follower comprising ya base plate 'and a friction barrel of noncorrosive metal `welded thereto, said Ebarrel comprising an internal friction surf-ace, spaced composition friction shoes eng-aging said surface, resilient means under compression between said shoes, another follower -comprising shoe-carrying means, said 'shoe-carrying means including spaced bearing surfaces cooperating with the 'top and bottom extremities -of each shoe, vand a substantially Vertical spring sleeved 'over said barrel and bearing against said plate and against labutment means on said second-mentioned follower, said shoe-carrying means comprising a hollow yoke and said resilient means being substantially housed within said yoke between said shoes.

12. In a friction .absorbing device, a 4follower comprising 'a base plate and a friction barrel of noncorrosive metal welded thereto, said barrel comprising an internal friction surface, spaced composition friction shoes engaging said surface, resilient means under compression between said shoes, another follower comprising shoe-carryling means, said shoe-carrying means comprising spaced vertically aligned horizontal bearing surfaces cooperating with the top and bottom ex-l tremities of each shoe, and la substantially vertical spring sleeved over said barrel and bearing aga-inst said plate and against abutment means on said second-mentioned follower.

13. In 'a friction absorbing device, :a follower comprising a base plate and a friction barrel of noncorrosive metal welded thereto, said Ibarrel comprising an internal friction surface, spaced composition friction shoes engaging said surface,

resilient means Lunder compression'between' said. shoesanother follower .comprising shoe'-carrying means'said shoeecarrying means .including 'a:ho1'; low yoke with spaced parallelbearin'gsuifaces cof 10 plate and against abutment means on saidseoondmentioned follower.

14. In a "friction absorbing deviceav follower comprising a base plate and-a vfriction barrel of noncorrosive rmetal welded thereto, said barrel comprisingr an internal friction surface, spaced composition friction shoes engaging said surface, resilient means under compression between said shoes, another follower comprising shoe-carrying means, said shoe-carrying means including a hollow yoke'with spaced parallel bearing surfaces cooperating with the upper extremities of said shoes and spaced members with horizontal bearing surfaces cooperating with the bottom extremities of said shoes, and a substantially vertical spring sleeved over said barrel and bearing against said plate and against abutment means on said second-mentioned follower, said resilient means being substantially housed in said yoke between said shoes.

15. In a friction absorbing device, a top follower comprising a base plate and a friction barrel depending therefrom, said barrel comprising an internal friction surface, a bottom follower comprising a base and a yoke projecting upwardly therefrom, lugs o-n opposite sides of said yoke at said base at opposite sides of said yoke and spaced therefrom, each of said studs having at its upper extremity a horizontal shoe abutment face in 'alignment with .the adjacent abutment surface,'a pair of spaced friction shoes engaging said friction surface, resilient means under compression between said shoes, each of said shoes having a recess at its upper extremity receiving one of said lugs and a recess at its lower extremity receiving one of said studs, said shoes having substantially horizontal bearing surfaces engageable with respective abutment surfaces and abutment faces, and a spring sleeved over said barrel and seated against said base plate and said base, said resilient means being substantially housed within said yoke between said shoes.

16. In a friction absorbing device, a top follower comprising a base plate and a stainless steel friction barrel depending therefrom and welded thereto, said barrel comprising an internal friction surface, a bottom follower comprising a base and a yoke projecting upwardly therefrom, lugs on opposite sides of said yoke at the upper extremity thereof, each of said lugs presenting a substantially horizontal fiat shoe abutment surface, studs projecting from said base at opposite sides of said yoke, each of said studs having at its upper extremity a substantially Y horizontal flat shoe abutment face, a pair of spaced composition friction shoes engaging said friction surface, resilient means under compression between said shoes, each of said shoes having having a recess at its lower extremity receiving the adjacent stud for interlocking engagement therewith, and a spring sleeved over said barrel,

7 saidspring being seated at oppositefends thereof against saidbase plate `amd said base respectively,4 said resilient: means being substantially housed. within said yoke between said shoes.

WALTER L. SCHLEGEL, JR.- 5

FRED E. BAcHMfm.Av

f REFERENCES CITED v v The follwing references are of record in the lo file-of this patent: 'I

UNITED STATES PATENTS Name Date Numbe Peycke May 30, 1916 Name i Date Symons -Nov. 15, 1921` O1anderv June 161931 Ragsdale June 11, 1935 OConnor' Mar. 1, 1938 Matthews May 21, 1940 Blattner Mar. 4, 1941 e Snyder Apr. 8, 1941? Olander Dec. 9, 1941 Snyder Apr. l10,11945 vCottrell ...July 3, l1945 Cottrellv Aug'. 7, 1945

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