US2394082A - Snubber - Google Patents

Description

Feb. 5, 1946. b. M. LIGHT l 2,394,082

SNUBBER Filed oct. so, 1942 sheets-sheet 2 INVENTOR.

` Patented Feb-5, 1946 OFFICE SNUBBER David M. Light,Y Chicago, Ill., 'assignor to American Steel Foundries, Chicago, Ill., a. corporation of'New Jersey Apbiicationoctcberso, 1942, serial No. 463,954

- 2o claims.

My invention relates to friction absorbing devices and more particularly Vto such a device com-.

monly called a snubber which, when associated witha group or nest of springs, serves to dampen the vibrations thereof in suchmanner as to substantially eliminate harmonic vibrationsV of said springs. y

My novel snubber is particularly designed for applicationrto a coil spring vgroup affording support for the bolster of a railway car truck Wherein said snubber may be substituted for one or more of the coil springs constituting said group as desired. It will, however, be understood that my novel snubber or friction absorbing .device may be used for any analogous purpose to which it is suited.

A specific object of my invention is to` devise a snubber such as above described in which a pair of followers are in frictional engagement with a plurality of' associated friction shoesVthe shoesv being urged into. said engagement by means Aof a novel spring seat casting in wedge engagement with the shoes, said casting affording a seat for an associated spring sleeved over one of said followers and afforded a seat against a flange thereon.

A further object of my invention is to provide an arrangement such as above described in which the follower over which the` above-described springis sleeved is splitintoa plurality of segments whereby eachof said segments may be urged into frictional engagement with said spring by means of the friction shoes above described.

Still another object of my invention is to de visejin combination with the above-described snubber aV novel meansV for retaining the device in assembly on the release stroke thereof, said means comprising a member received through aligned passages in the spaced followers and inV the spring seat casting and said member having at opposite ends thereof means for abutment with respective followers in order to limit their movement away from each other on the release stroke. Still another object of my invention is to de sign a novel spring seat casting comprising a ringlike base having an opening therethrough Vfor the receptionzof an associated follower and affording about the margin thereof a-seat for an associated spring, andsaid spring seat casting also comprising an integral yoke or bridge spanning said opening and comprising wedge surfacesv for engagement with associated friction shoes, said bridge being provided with an opening for the reception of the securing member above described.4

'Inxthedrawings, f

sleeved over the pedestals Figure 1 is ,a side view off my novel snubber, the left half thereof being a view in felevation andthe right half thereof being a sectional view taken substantially in a vertical plane bisecting the snubber as indicated by the line l-l of Figure 2, and Figure 2 is a top view ofthe structure shown in Figure 1, therleft half thereof beinga4 plan view, and the right half thereof being a sectionalview taken inthe plane indicated by the line2-2 of Figure 1.` Y

FiguresB, 4 and 5 show inldetailvmy novel form of spring seat casting, vFigure 3 being a side elevation taken from a shoe engaging face thereof, Figure 4 being a plan view taken fromr the top as seen in Figure 3, and Figure v5 being a sectional View taken substantially inthe plane indicated by the line 5&-5 of Figure 4; Y Describing my invention in detail, alfollower 2,

here shown as a top follower, is divided orA splitV into a plurality of substantially identical segments or friction members 4, 4l In the modification shown, thefollower 2 comprises a pair of segments 4, 4 cooperating with a pair of friction shoeshereinafter more fully described, but it will be readilyunderstood by those skilledcin the art that if desired, said follower 2 may be split orV divided into three or more segments 4, 4 each cooperating withv an associated frictionv shoe. Each of thesegmentsf4 comprises a b'as'eflaf-u fordingr a seat asat 8 (Figure 1)r for. an associated supporting fmember, 'such as a bolster of 5a railway car truck, said seatbeing tapered at |'0j to afford arocking movement of saidsupported member. Each base on the edge thereof adjacent 'the Ybase on the other segment. 4'is, provided with a depression l2 affording convenient means forthe reception of positioning means on the associated supported member, and the base 6 is also provided on saidedge a recess l4- to affordclearance lfor an associated securing member in a manner hereinafter more fully described. Projecting angularly from the base 6 of each segment 4 is a pedestal or friction stem I6 kcomprising on the inner surface thereof a diagonal V-shaped friction face I8 relieved as at 20 in the customary manner to prevent the Wearing of a4` shoulder thereon, said face being in complemen tary engagement as at 22 with a friction shoel generally designated 24, and on thev opposite side thereof'the pedestal I6 is providedwith anarcuate friction surface 26 in 4'complementary frictional engagement as at `28 withthe coil Vspring 30- Y I6, I6 and conveniently formedwith a flat surface to accommodatey,the above-mentioned frictional eng-agement at'.l 2.8.

2fr Q Y 2,394,082 Y TF1 s;

It is to be understood that I do not wish to be As here shown the spring is formed asVV an octagonal bar, but it will be readily understood that said spring may be of any desired section. The spring 31D is seated at the upper end thereof as at AY32 against flanges 34, 34 on the respective segments 4, 4 of the top follower, and said spring 30 is seated at the bottom thereof as at 36 on the base 38 of my novelspring seat casting generally designated 49 and shown in detail in Figures 3 to 5 inclusive. Y

My novel spring seat casting may be formedof` any suitable material vsuch as iron or steel and may -be provided with the before-mentioned basek 38, said base being a generally ring-like disc pro- Y V vided with anopening 42 therethrough and serv- 15 ing a purpose hereinafter more fully described.

' At opposite sides of the opening 42 spaced legs 44, -44 project angularly from the base VV38, and integrally formedwith. the ends of said legs remote from said base is a transverse web 46'presentingY onv the surface thereof facing the base 38 the:k oppositely directed diagonal frictionv surfaces 50, 5B fort/edge engagement as at 52, 52 (Figure 1)"With the friction shoes 24, 24. The Web A 481-is formedwith-an opening 54 therethrough 25 formed'andV arranged for the reception of an associated securing member serving to retain the snubber in assembly on the release stroke thereof, yas-hereinaiter more fully described. It'may Vbe noted thatfthe web 46 may be formed of anyk 30 convenient ksection affording the before-mentioned diagonal friction surfaces 50, however, the

Y 'V-sectionshown is regarded as preferably inaffording a relatively light and suitably strong structure for the purpose. It may be noted from a consideration of Figures 3 to 5 inclusive that the web 46 and the spaced legs 44, 44 connecting said web tothe base/38 form a yoke or bridge designated 56 (Figure 3').

A bottom follower generally designated 58 com- 4 engagement Wi prises the substantially annular plate-like Ibase eaifording a seat as at 62"(Figure 1)"'forv the snubber upon anY associated supporting, member,`

thejbase 60'- being tapered at64 to afford Varock- 45 ingmovement for thesnubber onthe seat 62 and theibase 60 `comprises the opening 6E' therethrough, said openingl communicating withl the chamberi' formed' within vthe hollow projection 1 6 extending upwardly from the base 60; 4'said projectionr comprising on opposite "sides thereof friction faces in complementary diagonal face en;v gagementfat 12, 12' with the respective' friction shoes24,'24.f Y

Means is provided for retaining the snubber in assembled relationship on the release strokev thereof, said; means comprising a bolt orl otherY suitable' member T4 extending through'the passages i4 and 54 through the top follower' and0 the web 46 of the spring seat casting respectively, said bolt also extending between the friction shoes 24, 24 and being affor edclearance therefrom by means of recesses therein indicated at 16, 16

(Figure 2), and said bolt also extending throughY an 'opening 18 the projection 10' formed onv 65 v the base 60 of' the bottom followerli8.v The bolt vis provided with a head 86 adapted to engage the baseB of each segment 4'of the top follower as at 82 (Figure l) within the depression or recess f2, and the bolt is afforded a .nut 84 ory othery convenient: securing means on the opposite end thereof adapted'to engage the projection 10 of the bottom followerV 58 s at 86.' I-t will be understood,that if desired, the nut 84- may be secured limited by the exact embodiment of the device shown whichis merely by way of illustration and not limitation as various and other forms of the device will, of course, be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

I claim: l

l. yIn. a friction absorbing device, atop follower 0 divided into a plurality of segments eachpresenting an inner diagonal V-shaped friction face and an outer arcuate friction surface, a plurality of shoes each engaging one of said faces, a spring seat member comprising a yoke in diagonal face engagement with the tops of said shoes, and a spring seat integrally formed with the bottom'of saidryoke, an opening through said seat, a coil spring sleeved. over said top follower in frictional engagement with the segments thereof and seat- 2 ed at opposite ends thereof against means on v divided. into a plurality of segmentseach presenting an inner diagonal V-shaped friction face and an outer arcuate'friction surface,` a plurality of wedges each engagingv one' of said faces, afspring; seat memberV comprising a yoke in diagonal face engagement with the tops of said wedges, and a spring seat integrally formed with the bottom of said yoke, an opening through said seat,V a coil spring sleeved overv said topi followertinrfrictional th the segments thereof and seat-y ed at opposite ends thereof'against means on said segments and against said seat, and a bottom follower extending throughsaid opening in diagonal face engagement'with said wedges. f. i

3. In a friction absorbing device, al follower divided into a plurality of segments each having an ,inner friction face and an outer frictionsurface, friction'shoesin engagem-ent'withV respective e faces,a yoke in diagonal face engagementwith corresponding ends of said shoes, a ring-like base on saidyoke affordingV a springv seat, another follower sleeved within said Ybase andI in' diagonal face engagement with the Voppositeends of said shoes, and a coil spring Vsleeved over said-splitfollower in frictionalengagement with said surfaces and seatedat opposite ends thereof against said spring seat and against means on the segmentsof said split follower.r Y

4. In a friction absorbing device, a follower comprising internalV friction surfaces, friction shoes in engagement with respectivel -of` saidY surfaces, a member comprising a yoke in diagonal Y face engagement withthe adjacent ends of said shoes, and a base on said yokeV vaffordingV a spring seat, an openingvv through said base, anotherfollowe-r projecting through said opening' in diagonal face engagement with the opposite ends of said shoes, and a compressionspring abutting" Said seat and bearing againstV the first-mentioned follower, said spring being sleeved over said firstmentioned follower; l

ein a friction absorbance-vica arfouowerl Y divided into a plurality of segments-each having `by any` convenient meansvsuch as by weldingY or 75, an internal friction face 'and 'external friction f bypeenngthe end of the bolt, i surface, friction means in engagement with respective of said faces, a. member in wedge engagementl .with said `friction means and affording a spring seat, resilientmeans sleeved over said divided follower in frictional engagement with said surfaces `and in abutment with Asaid seat and with seating means on said segments, and means associated with said friction means for moving the same against said vfaces and affording a seat for the device.

6. Inv a friction absorbing device, a follower divided into a plurality of segments, a plurality of frictionshoes betweensaid segments andv in frictional 'engagement therewith, Wedgemeans engagedwithopposite .ends of said shoes to urge said Vshoes into said engagement, lone ofv said wedgel means affording a spring'seat and the other of said wedge means affording a seat for the device, and resilient means sleeved over said segments in frictional engagement therewith and seated at opposite ends against said spring seat and said segments.

7. In afriction absorbing device, a follower n comprising internal friction surfaces, friction shoes there-between in engagement with respective of said surfaces, a member comprising a yoke in diagonal face engagement with the adjacent ends of said shoes, and a base on said yoke affording a spring seat, an opening through said base, another follower projecting through said opening in diagonal face engagement with the opposite ends of said shoes, and a spring abutting said seat and under compression between said seat and the first-mentioned follower.

8. h1 a friction absorbing device, a follower comprising internal friction surfaces, friction shoes engaged therewith, a member in wedge engagement with corresponding ends of said shoes and affording a spring seat, another follower in wedge engagement with the opposite ends of said shoes and affording a seat for the device, and resilient means abutting said spring seat and means on the first-mentioned follower, said resilient means being sleeved over said first-mentioned follower.

9. In a friction absorbing device, a follower having internal friction surfaces, friction shoes engaged therewith, a member in wedge engagement with said shoes and affording a spring seat, resilient means sleeved over said follower and abutting said seat `and means on said follower, and a spaced follower in wedge engagement with said shoes and affording a seat for one end of said device,'the first-mentioned follower being split into a plurality of segments to afford frictional engagement thereof with said resilient means.

10. In a friction absorbing device, a compression spring, a split follower affording a seat therefor and presenting internal friction surfaces therewithin, friction shoes engaging said surfaces, a yoke member affording a seat for the opposite end of said spring and having wedge means bearing against the ends of said shoes remote from said last-mentioned seat, another follower in wedge engagement with the near ends of said shoes, and securingmeans extending between said followers.

l1. In a friction absorbing device, spaced followers affording seats for opposite ends of said device, one being split into a plurality of segments, friction shoes each in engagement with both followers, a member in wedge engagement with said shoes, and resilient means sleeved over said split follower and seated thereagainst and against said member, said resilient means being in frictional engagement with said segments.

i12. In a snubber,' al compression spring, a followerV seated .thereagainst 'and presenting there- W'ithinlopposedv friction surfaces,` friction shoes engaging said.l surfaces, a wedge casting affording aseat forthe opposite endrof said spring and having wedge engagement with; the ends of said shoes remote from Asaid last-mentioned seat, another follower in wedge engagement with the lopposite ends vof jsaid `shoes, and securing means extendingthroughlsaid casting and said followers.

, 13.; In'afsnubber, a .compression spring present.. ing inter-nal friction surfaces,^a follower affording a seat for one end `of said spring` and having arcuatewalls extending therewithin for engagement with saidsurfaces, said walls presenting. internal friction faces;` friction shoes engaging said faces; amember affording .a seat :for theoppositeend of :said spring and `having `wed-geengagement Vwith the ends of said shoes remote from said lastmentioned seat, a follower abutting the opposite ends of said shoes, and retaining means between said followers.

14. In a. snubber, a compression spring presenting internal friction surfaces, a follower affording a seat for one end of said spring and having arcuate walls extending therewithin for engagement with said surfaces, said walls presenting internal friction faces, friction shoes engaging said faces, a member affording a seat for the opposite end of said spring and having wedge engagement with the ends of said shoes remote from said` last-mentioned seat, a follower in wedge engagement with the opposite ends of said shoes, and retaining means lbetween said followers, the engaging faces betweensaid shoes and said first-mentioned follower being along inclined V-shaped areas.

15. In a snubber, a compression spring, a split follower seated against said'spring and presenting friction walls therewithin in engagement therewith, friction shoes engaging said Walls, a member affording a seat for the opposite end of said spring and in wedge yengagement with the ends of said shoes remote from said last-mentioned seat, anotherfollower in wedge engagement with the near ends of said shoes, and securing means between said followers.

16. In a friction absorbing device, a compression spring, a split follower affording a seat therefor and presenting friction walls therewithin, wedge means in diagonal face engagement with said walls, a member affording a seat for the opposite end of said spring and in Wedge engagement with like ends of said Wedge means, an opening in said member, a spaced follower projecting through said opening in wedge engagement with the opposite ends of said wedge means, and securing means for said device, closingof said device being operative to urge said wedge means against said walls. Y

17. In a snubber, a compression spring presenting internal friction areas, a split top follower seated against one end of said spring with walls therewithin, shoes having wedge engagement with said walls, a spring support member abutting the opposite extremity of said spring with wedge means engaging the ends of said shoes remote lower in wedge engagement with the opposite ends of said shoes, and securing means for said followers.

18. In a snubber, a split top follower having internal friction faces and external friction surfaces, shoes in wedge engagement with respective of said faces, a member in wedge engagement with corresponding ends of said shoes and from said extremity, a bottom folends againsty saidJseat seat, a. octtomafonower .in

wedge engagement with the `opposite ends Yofyseicl shoes, `and' resilientY means sleeved over Ysaid split follower and 1 in 'frlctlonal engagement with. .the external surfaces thereof and seated, at opposite and'rsaidtop follower. f 19.111 a; snwbber, a. compression spring pre seating'internalfrietioniareas, a split top follower seated yagainst one endo! saidspring with wells therewithin, Vslices 'having wedge engagement witnseid walls, efsprlng support. memberrebutting. Ythe opposite extremity oifsaid spring with wedgemeans engaging .the ends of said shoes remote from said extremity, a follower in Wedge engagementwith the-opposite ends of said shoes, and'secrlng memes forisaid, followers, reciprocal movement between said followers being operative to wedgesaid shoes against said walls and urge 10 wedge'means engaging the therealong Y, x

`tlzle'seme into 4:fictional engagement iwitn said spring; said Walls'lraving inner surfaces diverging toward said .bottomifollowen z Y `20; Inra, snubber, a compression spring vpreV 15 V-Vshaped tapering. friction surfaces and relieved areas aboveisaidrsurfaces, to accomodate wear DAVID M'. Liam. r

Images