close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Dec. 31, 1946.
p. M. LIGHT
2,413,458
TRUCK
Filed Oct. 9. 1943
2 Sheets-Sheet 1
1:4
'
'
INVENTOR.
@cu/¿œ
1wl
u
l
`
,
‘$79.
Dec. 31, 1946.
D_ M, |_|GHT
2,413,458
TRUCK
Filed oct. 9, 1943
2 sheets-Smet 2
/
Z "
Oni
r
Ó@
~
y
'
Patented Dec. 31, 1946
2,413,45@
UNITED .STATE
¿OFFICE l
DavidvM. Light,*Chicago, Ill?, assignor to Ameri»`
can Steel Foundries, Chicago, Ill., a corpora
tion >of New Jersey
Application october' 9, 1943, serial No.-5o5,e2o
Vze claims.` (ci. 10s-197)"
Figures 5 'andrôl'alje .respectively a fragmentary '
My invention relates to railway car trucks and
more particularly to a ride control'truck incor
top' planview and a fragmentary' lside elevation
porating a friction device for dampeningoscilla-`
tions of the truck bolster.
of the bolster..
__ 4
The general object of my invention is ¿to pro- 5
vide a ride control truck wherein normal oscillaf
tions of the bolster are dampened by a substanItlally constant amount of friction and unusually
Q
'
~
`
`
y
'
iiiustiate’thef'riction shoe is
detail, 'Figure '7_ being a‘rear elevation taken from
[Figures 7, Sand 9
the, bolster .engaging face thereof, Figure 8 being.
a side elevation, and Figure 5,3` beinga bottom plan
.
view.
"
'
_
A
Y.
ì Y y
great or bouncing oscillations of the bolster, such A. Describing my invent'io- v_.inr, detailf _the fside
as may frequently occur‘under service conditions, 10 frame comprises the tension member 2.,- the com- are dampened by an amount of friction which in-rv
pression member >4, and `a vcolumn 6_‘joining said
creases proportionatelyl to the amount of relamembers adjacent each 4end,oflthe¿frame tode
tive movement between the side frame and .the
fine a central bolster- opening `8 _and a .window
bolster.
-
,
'
K
"
" _
n opening I0 at each endof. the frame.
Beneath
A specific object of» my inventionpis to design 15rv the bolster opening,> thetensionvmember `ilk is of
a truck such as above described in which friction
box> sectioncomprisin'g thefbottom chord I2, the
shoes are disposed at'opposite sidesl of the bolster
top chord I4,`the~inbo`ard andoutboard webs» it ,
in wedgeengagement therewith and in frictional
and Iii,>> and the reinforcinggib .2o „disposed in
engagement with the _adjacent columns, each
.termediate' said vwebs and `siib'stantially rparallel
shoe being actuated by a spring? compressedjbe; 20 thereto.. The top chord I4'is widened and formed
tween said shoe and an adjacent bolster jwall,
with _an upstanding ilange`l22 at each _of thein
auxiliary actuating means being provided for
board Vand- outboardsides thereof, said-'ñanges
each shoe in the form of a spring supported on
»f affording-> convenientl confining means - for the
the side frame and having means projecting ‘y bolster supporting springs 24> illustrated in ele~
through an opening in the bolster wallr force- -25 vation‘in Figure 3 and diagrammatically in Fig
-operation with the' main shoe actuating spring.
The main spring is precompressed to such an ex-
ures 1,2 and 4.
'
~
y
.
l y
y
Seated as at`26 on _the springs 24,is'a bolster
tent that the reactive'force thereof r'during normal
28 havingat each side thereof a pocket êiil‘deñned
oscillation of the bolster is ‘grea`ter"~.than the re‘by the inboard and outboard Walls 32 and 36 (Fige
active force of the auxiliary spring. However, 30 ure 2) and the transverse` web 36 extending`
during an unusually great or bouncing oscilla.therebetween, lsaid web being formed with> an
tion of the bolster, the reactive force ofthe aux-
, arcuate portion 38 for the reception 0f a portion
iliary spring is greater than lthat of the 'main
'"of the associated friction shoe, as hereinafter dis
' spring.
1
'
A'
’
,
~
'
cussed, _ Formed on the bolster within the pocket.
Still another object of my invention is todesign 35 30 are the spaced inboard and outboard ledges
a truck of the above describedA type wherein the
40, 4ll‘presentíng Wedge surfaces 42, 42 (Figure 6)
bolster, the side frame columns, and .the asso-`
sloping upwardly toward the adjacent column.
ciated friction devices are formed and arranged j
to afford a quick wheel change, wherein the
A friction shoe 44 is received within each
pocketßil, said ‘shoe being of skeletal form, as
bolster is elevated in the bolster opening and re- 40 illustrated' in detail in Figures 7 to 9 inclusive
moved from the top thereof while 'thev bolster " andl comprising the' front or main friction wall
supporting spring group remains in normal as46 frictionally engaged as at 48 with a liner 5@
sembled relationship with the rside frame.>
In the drawings,
"
,
mounted _on the column 6;
'
’
At opposite sides
thereof the shoe is provided with the spacedwing
.Figure 1 is a fragmentary side elevation of` a `>45 members 52, 52 presenting crowned wedge surf
railway car truck embodying my invention, one
facesv 54, 54 for complementary wedge engage
end onlyof the truck being illustrated inasmuch
ment at 5B with the surfaces 42, 42, as best seen
as it is symmetrical about its transverse center
in Figure 4. The friction ,shoe also comprises a
line.
top wallV 58 aiiording a'spring seat as at 60 (Fig
`
l
Y `1
y
A
Figure'2 is a fragmentary top plan view of the 50 ure 3) for the -main actuating'spring 62 seated at
structure shown in Figure 1 with the side vframe
its lower end on a _spring plate 64 mounted within
illustrated in sectionthrough one of the columns.
a complementary recess 66 in the bottom wall dii
Figures 3 and 4 are sectional views taken‘re- ^ vof the bolster,- It’jmay'be noted that the friction
spectively in the longitudinal verticalplanes indishoe 44- is'formed with arear .wall 'l0 having a
cated by the lines 2-3 and 4-4 of Figure 2,_ ’
55 loop 12 -received within the arcuately formed por»
2,413,458
Ition 38 of the web-36.".ïf'fDèflning the rear end of.
the pocket'30, andalign:> with' the loop-12 are
the openings ‘Hand 'IB for ‘ed in-the inboard'and
outboard Walls 32 and-34 'defining the sides of the-`
pocket. Thus it will=be'»,~<,ufnjderstood that during .
assembly and disassemblïy ff': the truclcï retaining
means, such as pins,~~may
evinserted through the
loop 12 and the aligned openings'll and J6 where-_
by the friction shoe-may be withdrawnafromen
member supported from said frame and adapted
to project through acomplementary >opening in
said last-mentioned wall for cooperation with one
end ofsaid unitV to increasethe compression there
of underce‘rtain operating conditions.
2. Ina railwayl car» truck, a side frame com
prising spaced lcolumns and an intervening bol
.ster opening, ,resilient means on said frame in
said opening, a bolster supported on said resilient
gagement with the column vin. order .to facilitate.. 10.v means, apocket in each side ofthe bolster with
removal and insertion of thefbolster. ,
-An auxiliary shoe actuating spring ‘18,2'il1us-y
trated in section in Figure 3» and diagrammati
cally in Figures land-4, is associatediwitheach
l spaced inboard'and outboard ledges therein hav
ing wedge faces sloping upwardly. toward the
.adjacent column, a friction shoe in each pocket
having winglportions in complementary engage
shoe 44, said springA being seated on the top chordV 15 mentwiththe-associated faces, eachshoe being
I4 of the tension member and> supporting af spring
frictionally. engaged with the adjacent column, a
cap 80 having a lug or projection 82 extending
spring plate .in keach pocket seated- on. the -bottom
through a complementaryopening 84’(Figure.3)
wall of the bolster, resilient means bearing against
in the bottom wall ofthe bolsterl opening, saidv ‘ saidv plates :and said` shoes, resilient lmeans
projection 82 bearing against the spring plate 64.r 20' mounted on said frame, spring caps on said last
It will be understood, that, as illustrated, the , mentioned resilientfmeans, having projections ex
spring 62 is precompressed-to such an' extent that
ltending upwardly through openings inthe bottom
the reactive force’thereof is substantially greater
wallof the bolsteruand engaged ywith said plates,
than the reactive force of the auxiliary-spring'.'18.V
said second-mentioned resilient-means being pre
Thus duringv normal oscillations. of r the .~ bolster»
compressed to «such anextentithatthe reactive
the friction shoe 44 is urged against the'column
by means'of the spring Bîwhereby-a substantially
constant amount of friction is developed, during
normal oscillations of the bolster;
ever, a relatively great or bouncìngoscillation of
the bolster occurs, the auxiliary spring 18.15 com
pressed to such an extent that its> reactive‘force
becomes vgreater than the reactive force of the
spring B2, and under these-conditions, the spring@
plate 64 is lifted bymeans of the spring-f cap 80»
from the bottom wallfof the'bolster, and thus the
auxiliary spring 18 is operable to urge the‘shoe
44 against the column with an increasing pres
force thereoffmv greater than> the reactive force
»of said third-mentioned resilient means during
normal'oscillations of» thev bolster, and less than
the’reactive Aforce of said third-mentioned resil
ient means during an unusually-great oscillation
ofthe bolster.
.
Y
>
3. Inj a- railway car truck, 4a sidev frame com
prisingf spaced columns' andan intervening bol
ster opening, resilient meansron said frame insaid
opening, a bolster ysupported on> said resilient
means, a pocket in eachsidezof the bolster with
It will be understood that by means of this
spaced inboa?d and’ outboardiledges therein hav
ing wedge faces sloping‘upwardly toward the ad
`iacent column, a friction shoein eachpocket hav
ing spaced wing ,portions `in complementary en
gagement with the associated faces, eachshoe be’
novel arrangement normal oscillations of the
ing frictionally. engaged with. the adjacent col
bolster are resisted by a substantially constant
amount of friction developed between the shoes
umn, .aspring plate in each-pocket seated on the
bottom wallV of the bolster, resilient means bear
ing against saidl plates and, said shoes, and re
silient .meansvmounted on said frame and coop
erating with vsaid plates through openings in said
sure proportionate to the downwardV movement of
the bolster.
i
and the columns, and unusually great oscillationsf
of the bolster are resisted by a graduallyincreas
ing amount of friction.
It may be noted that the bolster openingß com
prises a widened upper portion 86, and each side
of the bolster 28 is provided with `inboard and
outboardbolster guide lugsBS., 88, the outboard
lugs, as will be clearly apparent from a considera
tion of Figure 1, being of less depth than the
widened upper portion 8B of the bolster opening,
whereby the bolster may be elevated therein` and
removed therefrom along with the friction shoes
44, 44 and the actuating springs 62, G2 during a
bottom wall, said second-mentioned resilient
means being'precompressed to such an extent that
the reactive force thereof is greater than the re
reactive force of said third-mentioned resilient
means during Vnormal oscillations of the bolster
and less than the reactive force of said third
mentionedl resilient. means during an unusually
great oscillation of the bolster. Y
4.» Ina'railway car truck, a side frame Vcom
prising spaced columnsand an intervening bol
quick wheel change. ,
sterr opening, resilient means on said frame in said
It is to be understood thatI do not wish to be Y
opening, a. bolster supported on said resilient ,
limited by the exact embodiment of the'device 60 means, a pocket in each side of the bolster with a
shown which is merely by Way of .illustrationand
not limitation as -various and other forms of the
wedge surface therein sloping upwardly toward
the adjacent column, .a friction shoe in each
pocket in complementary wedge engagement with
the associatedsurface, each shoe being frictionally
the invention or the scope 0i.’ the claims.
6,5 engaged with the adjacent column, a spring platel
I claim:
Í
in eachîpocket >seated on the bottom wall of the
I 1. In a railway car truck, a side frame' compris-bolster, resilient means bearing against said plates
device will, of course, be apparent to those skilled
in the art without departing from the spirit of
ing a column, a bolster spring-supported from said
frame adjacent said column, said bolster com
and said shoes, resilient means mounted on the
frame, and spring caps on said last-mentioned
prising spaced top and bottom walls, and friction 70 resilient means having projections extending up
means comprising a wedge surface on said bolster
wardly through openings in said bottom wall and
intermediate said walls, a friction member Ven
abutting respective. of said plates, said second
gaging said surface and a friction surface onsaid
mentioned resilient means being precompressed to
column, a resilient unit compressed betweensaid
such an extent that the reactive force thereof is
friction member and one of said walls, and arigid 75 greater than the reactive force of said third
‘2,413,458
6
mentioned resilient means during normal oscil
in said bottom wall lfor engagement with said
lations of the bolster.
plates.
fy
’
_
Y
»9. Ina railway car truck, a side frame com
5. In a railway car truck, a side frame com
prising spaced columns and an »interveningbol
prising 'spaced columns ,and an interveningbolster
ster- opening, a springy group> on said framev in said
opening, a spring group on said 'frame `in said
opening,<a bolster supported lin-.said vgroup, a
pocket -infeach side ofthe bolster’~wi_th a, wedge
face therein sloping towardV the adjacent column,
opening, a bolster supported on said group, a
pocket in each side of the vbolster with a wedge face
therein sloping toward'theadiacent column, a.
`friction shoe in each pocket in complementary
a friction shoe in each pocket in 'complementary
wedge engagement ,with the associatedï face, neach 10 wedge. engagement with the associated face, each
1 shoe being frictionally engaged‘withthe adjacent
shoe: beingfrictionally` engaged with thev adjacent
column, a spring vplate »in `each pocket seated
column, aspring platein ’eachpocket seated on
the bottom‘wall Aof the kbolster,"resi-lient means" .against a-wall'of the- bolster, resilient means bear- ’
ing against said plates and said shoes, and means
bearing againstk said platesïand said shoes, and
-mounted on saidiframe-and cooperating with said
resilient means mounted on VVsaid'frame and hav
plates through openings in said bolster wall, said
last-mentioned means comprising springs seated
in» said-»bottom -wall for abutment withsaidplates,
againstzportionsA of said'frame.
saidflrst -mentioned resilient’mea-ns'zbeing precom
10..In a railway car truck, a sideframe com
Pressed to such a’nextent thatsthe reactive force
thereof-isgreater thanI the reactive/forcent“ said 20 prising spaced columns and an intervening bolster
ing means extending upwardly; throughV openings
opening, a spring >group on »said'fra'me in said
opening, a'bolster supported on ,said group, a
Apocket in each side ofthe bolsterï with a wedge
jface therein sloping toward the adjacent column,
second-mentioned-,«resilient meansj'during normal
oscillations.ofthebolsten
»
.
'
6. In a-ride controltruckya side frameecom
prising rspacedicolumnsand an intervening bol
ster opening, resilient means'on said frame in .said 25 a frictionshoeln eachpocket in complementary i
-wedge engagement with the associated face, each
opening, a bolster supported on‘- said resilient
:shoe being >i’rictionally engaged with theiadlacent
.-means, a vwedge» surface on saidbolster atïeach'l column, `a spring plate in each pocket` seated
side thereof slopingupwardly toward the ad
against _a »wall of the bolster, precompressed re
jacent column,l a shoe engaging each wedge sur
silient means bearing against -said plates and .said
face and the associated column, a springV bearing
shoes, and’means mounted on said frame and en
against said shoe and against a spring plate seated
' on the bottomwall of thefbolster, a's‘pring onasaid
gageable with said plates> through openings in said
` frame,` and a cap on said last-mentioned spring i
bolster'wall for _further compressing »said resilient ‘
means duringunusually great oscillation ofgthe
having a projection extendingthrough an opening
in said bottom wall for engagement with said
bolster.
'
'
.«
,
`
'
Í
`
y
plate, saidiirst-,mentioned spring being precom
l1. Ina ride vçzontrolytruclga` side frame com
pressed to such an extent that theíreactive force
prising spacedicolumn's vand an intervening bolster -
opening, resilient meanson said frame in said
opening, va. bolster .supported on said resilient
thereof is greater’than the reactive force of said
second-mentioned spring during limited oscilla
tions of the bolster on said resilient means.
7. Ina ridey control truck, -a side frame-com
40 means,- a wedge surface onsaidbolster at each
side thereof sloping upwardly toward >the adjacent
column, a shoe engaging each wedge'surface and
the associated column, „a spring bearing againstv
saidv shoe and against a spring' plate seated'on the
ing,l resilient means on said frame in >said opening,
a ` bolster , supported --on said ,resilient means, a 45 bottom wall of the bolster, a spring on said frame,
andv a cap on said last-mentioned springr having a
wedge `surfaceon said bolster atA eachside thereof ’
projectionvextending through an opening in said
sloping upwardlyltoward'the-adjacent column, a
bottom wall for' engagement with said plate;
frictionshoe engaging each Wedgesurface andthe
12. In a ride control truck, a, sideframe com
associated column, anda pair ofv springs asso
ciated with each shoe'and arrangedin series with 50 prising spaced columns and an intervening bolster
prising tension and compression members and
spaced columns defining therewith a bolster open-`
opening, resilient means on said frame in said
a spring plate itherebetween, the upper of said
springs bearing against the associated shoe and
opening, a, bolster supported Yon lsaid resilient
means, wedge means on said bolster at each side
the lower of said springs bearing against the ten
>thereof sloping upwardly toward’ the adjacent col
sion member, and` anupwardly facing surface on
said bolster affording-stop means'for said plate, 55 umn, friction shoes engagingsaid wedge means
and the associated columns, and a pair of springs
said upper spring being precompressed to `urge
arranged in series between each shoe and the side
said vplate into engagement 4vwith ysaid last-men
frame, one of said'sprlngs being precompressed
tioned surface during normal oscillations of the
bolster.
-
«
`8. In a railway car truck, aside frame com
„and 'cooperating with> abutmentV means on the bol
60 ster to limit expansion thereof.
prising tension and compression members vand
spaced columns defining therewith a bolster open
ing, a springr group on said frame in said opening,
a bolster supported on said group, a pocket in each
side of the bolster with a wedge face therein slop 65
ing upwardly toward the adjacent column, friction
elements in saidpockets incomplementarywedge
I3. In a railiway car truck, a side frame, a
spring seat on said frame, resilient meansY on
said seat, va bolster supported by said means, fric
tion devices'carried yby said bolster at opposite
sides thereof,veach of said devices being entirely
'independent ofthe other and comprising a. resil
ient >element and a friction element urged thereby
engagement with the associated faces, eachele
ment being frictionally engagedwith the adjacent
intoengagement with a friction surface on said
frame for ldeveloping a substantially constant
thebolster in respectlve'pockets, resilient means
bearing against respective‘plates and the asso
ciated elements, and resilient 'means seated on
said tension member and having Vspring caps
said frame projecting upwardly from Vsaid seat
and each being adapted to engage an element of
one device'for increasing the amount of friction
- column, spring plates seated on the bottomvwall of 70 amount of friction'during normal oscillations of
the bolster, and spaced-independent means on
thereon extending upwardlyV through openings v7,5 ldeveloped by the friction element thereof against
2,418,458.
7
8
the associated surface during an unusually great
against the frame member and operatively en
gaged with said first-mentioned resilient means
for increasing the-amount of pressure against said
element during unusual downward movement of
oscillation of the bolster.
14. In a railway car truck, a side frame com
prising spaced columns and an intervening bolster
opening, resilient means on said frame in Vsaid
the bolster.
opening, a. bolster supported on said resilient
means, friction-'means carried by said bolster and
_
.
,_
.
2Q. In a railway car truck, a side frame com
prising a column, a bolster spring-supported from
said frame adjacent said column, said bolster com
spaced top andbottom walls, and friction
friction during normal oscillations of the bolster, 10 prising
means
comprising
a wedge surface on said bolster,
and -resilient means on said frame cooperating
a friction member engaging said. surface and a
with said friction means for increasing' the amount
friction surface on said column, a resilient mem
of friction developed thereby during an unusually
ber compressed between said friction member and
great oscillation of the bolster.
‘
e
kone of said walls, and aj rigid member spring
15. In a' railway car truck, a ,frame member, a 15 supported from said frame and projecting through
bolster resiliently supported therefrom, friction
a complementary opening in said last-mentioned
elements "in complementary wedge engagement l wall,
said rigid member being operatively engaged
with wedge means onfthe bolster, said elements
with-one end of said resilient member.
being in irictional [engagement with friction
l 21. In a railway car truck', a supporting member,
means on said frame member, precompressed re 20 another member .spring-supported therefrom for
silient means bearing against said elements and a
vertical movementwith respect thereto, and fric
wall'v of said _bolstenand means mounted on said
tion means comprising a frictionshoe and a sub
frameand projecting through openings in said
cooperating with vfriction surfaces on said columns
for developing a- substantially constant amount of
wall'said means being operable to further com~
pressV said resilient _means for increasing the 25
amount of pressure exertedl thereby against said
elements during an unusually great oscillation of
thebolster. '_
.
l _' __
_
_'
'
v
stantially Vertical precompressed -spring urging
said shoe against converging surfaces on respec
tive members, said spring being supported at one
end thereof _by a wall of said- supported member,
and a member` mounted on said supporting mem
_
ber and projecting through an opening in said
Wall for operative engagement with said spring.
prisin'gf spaced columns and an _intervening bol
22. In a railway car truck, a supporting member,
ster opening, 'a spring seat on said frame at the 30 another
member spring-supported therefrom, and
bottom-of said opening, resilientmeans on said»
friction means carried by the supported member
seat, al bolster _supported by said means, friction
comprising a friction shoe and a substantially ver
16. In a‘railway-'car truck, a side frame com-
devices carried by said bolster at opposite _sides
tical compressed spring urging said shoe against
thereof, each of said devices comprising a fric 35 friction surfaces -on respective members, said
tion shoe in wedge engagement with wedge means
spring being supported at one end thereof by a
on Vthe bolster and in frictional engagement with
wall of saidsupporting member, and a member
friction means on the adjacent column, and a sub
resiliently mounted on said supporting member
stantially vertical spring reacting against the‘bol
and projecting through an opening in said wall
ster -and said shoe, and spaced independent means
for operative. engagement with said spring.
on said frame projecting upwardly from said seat
23. In a railway car truck, a side frame with
and cooperating with respective springs for in
spaced columns, abolster spring-supported there
creasing the amount of friction developed by said
between, and friction means Vcomprising „friction
devices during an unusually great oscillation of the
elements in `wedge engagement with said bolster
and in frictional engagement`with respective col
17. In a railway car truck, a, side frame, a
umns, precompressed substantially vertical springs `
spring group on said frame, a bolster supported on
reacting at opposite ends thereof against said bol
said group, ‘a friction device carried by said bol
ster and respective elements, and'rigid means sup'
ster and cooperating with a friction surface on
ported -fromthe frame and adapted to cooperate
said frame for developing a constant amount `of /50 with theends of said springs reacting against
friction during normal oscillations ofthe bolster
said bolster for increasing the compression of
with respect to the frame, and resilient means on
said springs under certain operating conditions.
said frame cooperating with said ¿device for in
24. In a railway car truck, a side frame with
creasing the amount of friction developed thereby
spaced columns, a bolster resiliently supported
during an unusual oscillation of the bolster.
55 therebetween, and friction means comprising fric
18.` In ajrailway car truck, a frame member, a
tion elements in complementary we_ige engage
bolster resiliently supportedtherefrom, a. friction
ment with said bolsterv and in friction engage
element in ' complementary wedge engagement
ment with respective columns, precompressed sub
with wedge means on the bolster, said element
being in frictional engagement with friction 60 stantially vertical springs ueach- reacting at op
posite ends thereof againstsaid bolster and the
means on said frame member, compressed resil
associated element, and rigid means resiliently
ient means reacting against the'bolster and said
supported' from said frame and having operative
element, and meansl independent of said friction
engagement with the ends of said springs react
means cooperating with said resilient means for
increasing the amount of pressure exerted there 65 ing against said bolster ‘for increasing the com
by against said element during unusual down
pression of said springs during an unusually great
bolster.
v.
`
.
‘
ward movement of the bolster.
19. In a railway car truck, a frame member, a
bolster spring-supported therefrom, a'friction ele
ment in complementary wedge engagement with
wedge means on the bolster, said element being
in frictional engagement with friction means on
said frame member, compressed resilient means
reacting against _the bolster and >said element, and
oscillation of said bolster.
u
_
l ,
25. In a railway car truck, aside frame com
prising a column, a bolster vspring-supported from
said frame -adjacent said column, v'and :friction
means comprising a friction shoe having. wedge
engagement with said bolster >and frictional en
K sagement with said column, and a pair of vertical
arranged in series between said frame and
auxiliary resilient means seated at its lowerend 75 springs
said shoe, one of said springs being precompressed
2,413,458
9
10
and cooperating with abutment means on the
bolster to limit expansion thereof.
of friction during normal oscillations of the bol
26. In a railway car truck, a side frame com- \
prising a column and a spring seat adjacent there
ster with respect to the frame, and means on said
frame engageable with said spring for increasing
the amount of pressure exerted thereby against
to, a spring group on said seat, a bolster supported
the associated friction means during an unusually
from said group, and friction means comprising
great oscillation of said bolster, each of said de
a friction shoe having wedge engagement withy
vices being entirely independent of the other de
said bolster and frictio-nal engagement with said
column, and a plurality of substantially vertical
28. In a railway car truck, a frame member,` a
springs arranged in series between said seat and 10 bolster resiliently supported therefrom, a friction
element in complementary wedge engagementv
said shoe for actuation of the latter, the lower of
said springs being supported by said seat, and the
with-wedge means on the bolster, said element
upper of said springs being precompressed and
being in frictional engagement with friction
cooperating with abutment means on the bolster
means on said frame- member, compressed resil
to limit expansion of said upper spring.
15 ient means reacting against the bolster and said
27. In a railway car truck, a, side frame, a
element, and means carried by the frame and
spring group on said frame, a bolster end sup
adapted to engage said resilient means for in
ported on said group, a friction device carried by
creasing the amount of pressure exerted thereby
against said element during an unusually great
said bolster end at each side thereof comprising a
spring and friction means urged thereby into 20 downward movement of the bolster.
'
engagement with a friction surface on said frame
DAVID M. LIGHT.
for developing a substantially constant amount
vice.
v
y
f
Документ
Категория
Без категории
Просмотров
0
Размер файла
902 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа