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Патент USA US2404475

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July 23, 1946.
2,404,475
A. c. DAVIDSON '
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RAILWAY‘TRUCK SPRING‘BRAKE
"
Filed Sept. 22_, 1945
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INVENTOR
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ARTHUR C. DAVIDSON I
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BY
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Patented July 232 1946
' 2,404,475
UNITED ‘STATE s
PATENT OFFICE l‘
2,404,475, .
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RAILWAY TRUCK SPRING BRAKE‘
Arthur 0. Davidson, Chicago,‘_Ill.
' Application September 22, 1943, Serial No. 503,389
10 Claims.
(Cl. 267‘—4)
1
for the bolster 8 and for bolsteresupp‘orting
springs 9 which are supported from the intermediate portion of the tension member 5. Pref
erably, a spring plank I0 extends between‘ side
frames 3 at opposite sides of the truck‘ and a
spring seat or carrier II is mounted on each
The invention relates to the control of rail
way truck Springs and consists in a spring brake
or dampening‘ device and associated structure
intended primarily for use in a truck of the type
in general use in railway freight cars.
The main object of the invention is to pre
vent undesirable rebound action of the bolster
end of spring plank I0. This spring carrier has
upstanding lugs I2 and I3 vfor positioning the
springs which give the vehicle rough riding
characteristics tending to damage lading and to
truck‘springs. A spring cap I4 is mounted on
springs 9 and supports the end of bolster 6.
derail the truck.
Another object is to e?ect the desired snub
bing of the rebound‘ action without substantially
interfering with the initial compression‘ action
A pair of ‘ friction plates I5 are pivotally se
cured to spring carrier II by an arrangement
described in detail below and‘ extends vupwardly
therefrom and receivesbetween them a‘ friction
of the springs which should be soft to maintain
easy riding qualities of the truck and especially 15 plate I6 depending from spring cap I4. A bolt
I'I ‘disposed horizontally extends through fric
to protect light loads on which 71% of all dam
tion plates I5 and “3 being carried by plates I5,
age claims paid by railroads are'due to, lack of
proper snubbing action while cars are in transit.
Another object is to facilitate the installa
tion and replacement of ‘spring brake or snub 20
tween each end of the bolt and the adjacent
bing parts which may require renewal.
Another object is to provide friction plates of
large surface to resist rapid Wear and insure
Plate I6 has a slot I9 elongated vertically to ac
long life of unit.
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Another object is to provide for the assembly
of a spring brake without requiring; substantial
change and with a minimum amount of work
on the associated truck parts.
‘
and tensioning springs I8 are compressed 'be
plate I5, thus thrusting plates I5 towards each
other and‘ clamping plate It between them.
commodate relative vertical movement of plate
I6 and plates I5 in which the bolt is seated.
Plate I6 is wedge-shaped with its sides con
verging upwardly so that the friction between
the plates during the rebound ‘or expanding
movement of bolster springs 9 is substantially
greater ‘than the friction offered during com
These and other detail objects of the inven
tion‘ as will appear from the following descrip 30 pression of springs 9. The amount of‘friction
provided during compression of the springs and
tion are attained by the structure illustrated in
during expansion of the springs may be ‘con
the accompanying drawing, in which—
Figure l is a side elevation of a four-wheel
trolled ‘and varied as desired by adjusting the
tension on springs I8 and by predetermining the ,
truck for railway cars including the novel spring
brake device characterizing the present inven 35 angle of convergence of the sides of plate I6,
tion.
It is desirable that the friction plates have
'
Figure 2 is a detail vertical section taken on
the line 2—2 of Figure 1 and drawn to a larger
scale.
'
pivotal movement to the side frame and bolster
with which they are associated.
Tov accommo
date this requirement, the upper end of plate I6
‘
Figure 3 is a similar section showing the parts 40 is of T section with the lateral arms 20 curved
as indicated and cap I4 has similar arcuate
‘
lugs'2l cooperating with‘ the underface of the
Figure 4 is a horizontal section taken on the
in a different position.
line 4-4 of Figure 2.
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Figure 5 is a detail vertical section taken on
the line 5-5 of Figure 2.
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Figure 6 is a detail section taken approxi
cap to form an elongated recess ‘into which
the upper portion of plate I6 may be slid length- 7
45 wise and may be retained against removal by a
locking bolt 22. Cap I4 and plate l6 may'tilt
relative tov each other, as indicated in Figure
3, to accommodate relative lateral movement of
The truck includes the usual axle-mounted
the bolster and side frame or tilting of the bol
wheels I, journal boxes 2 and side frames 3
which may be integral with the journal boxes 50 ‘ster in a transverse vertical plane relative to'the
side frame or a combination of these relative
or assembled with separately formed journal
boxes. Each side frame includes a compression
Plates I5 are anchored to spring carrier II by
member 4, a tension member 5 and spaced struts
an elongated member which includes a bar 24.
or columns 6 cooperating with the middle por
tions of members 4 and 5 to form a. window 1 .55 extending from side to side of carrier II and
mately on the line 6-6 of Figure 5.
'
movements.
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2,404,475
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received in a slot 25 provided in the latter. The
ends 26 of'bar 24 extend beneath upwardly re
cessed portions 21 of carrier ll vat the ends of
4
verge towards the spring seating member, where
by the device offers substantially greater resist
ance to the movement of the plates during move
slot 25 and the anchoring device is thereby posi
ment of the members away from each other than
tioned and held in assembled relation with the 5 during movement of the members towards each
spring carrier and spring plank and side frame.
The body portion 23 of the anchoring device ex
6. In a railway truck spring brake, a spring
tends upwardly from bar 24 and is recessed lat
carrier, a plurality of coil springs seated on said
erally at 28 to receive inturned ?anges 25 on the
carrier, a cap member resting onsaid springs and
lower ends of plates l5 to form a ‘bearing and 10 arranged to- support a truck bolster, said cap
resist the upper thrust of plates l5.
,
member having adepending lug extending across
'
With this assembly, plates l5 may pivot about _
the member transversely of the bolster and sub
, carrier II to accommodate the relative move
stantially at the middle of the member and slotted
ment of the parts as described above. The single ' ' from one end towards the other end, a friction
other.
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tension device bolt l1 passing through’ plates l5 , 15 plate having a head slidably received in said
and I6 readily accommodates the relative'tilting '
'» slot, there being an upstanding part extendingv
of the plates in‘ their general'verticaliplane so; ‘across the carrier in the same general vertical
that'the bolster, as seen in Figure 1, may'rock‘l >Dlane as said depending lug on the cap member ,
relative to the truck [frame to the extent per-1 Lan'd recessed laterally, friction plates having their
mitted by its ?t between the bolster columns 6, ‘ 20 lower ends flanged and,‘ received in the recess in
and the friction device .is not subjected to any
‘said part, said plates overlapping said ?rst-men
strain "from such ro cking‘ movement of the ‘.bol
, tioned friction plate, and yielding means carried
on said plates and thrusting them into frictional
engagement with each‘ other. <
-' >
If desired, the elements of the springxcarrier
and spring. cap may be made integral with the 25
7. In a railway truck spring brake’v structure,
spring ‘plank. and therbolster or the parts of the
a spring carrier plate having spaced areas for
v spring carrier may even be made integral with,
mounting springs and having an elongated slot
‘ the side frame (as in a spring-plankless truck)
between said areas, there being upstanding lugs
and, if desired, the anchoring device 23,24 mayv at the ends of said slot each having an upwardly
be made integral with the spring .carrier or spring 30 ‘extending recess in its lower surface opening “to
plank or side frame, and other variations in ‘the
.wards the other lug, a friction deviceanchor
construction may be made all without departing
vmember positioned in said slot with its ends re
from-the spirit of the invention.
,
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ceived 'in'said recesses, said member, between its
‘What is claimed is:
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ends, extending upwardly above the level of the
1. In a devicecf' the class described, a member :35 plate ‘and having laterally opening recesses .for
‘ foriseating'truck .springsxa cap member for sup- 1
receiving horizontal ?anges on the lower ends of v
sterl
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porting a truck bolster on the truck springs, a -
pair‘ of plates extending abreast of each other .
y upright
8,. An’friction
anchor plates.
for a railway
,
» truck
.
7 spring
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brake
and substantially .vertically from one of said
including a spring carrier with laterally and
members and individually 'pivotally secured Silo downwardly opening recesses nearopposite sides
.thereto, a single plate extending .substantially
and an upright friction plate above the same with ,
vertically from the other of said members and
a hooked lower end, the anchor -.co1_nprising;an
pivotally; secured thereto and’ received "between
‘
elongated member with ends receivable in vsaid '
, recesses and arranged between its emigre project
thrusting the pair of plates towards ‘each' other 1 4-5 above the level of saidv ends} and there recessed
said‘pair pf‘pl'ates, and spring means yieldingly ‘
to‘ frictionally engage the opposing surfaces of
1 the other plate.
l '
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laterally to receive the hooked lowerend of the’
,
<2. Astructure as des
friction plate and anchor the same to the carrier. '
‘ 9. An anchor for a railway truck springibrake
cribed in claim '1 in which
:' the meansxclamping the plates together com
including a spring carrier with. laterally and
‘ prisestabolt extending substantially horizontally I550 downwardly opening recessesnear opposite sides
j through the plates andrsupported by at leastone
and a pair of upright friction plates withhooked
"of the plates, there being a coil spring between
lower ends facing towards each other,‘ the anchor
each end of the "bolt and the adjacent platerw '
having narrow end portions adapted to be re- }
3; A device as described in claim’ 1 ‘in which
ceived .in said recesses and also having. a down
3 the ‘plates and spring means are inclinable as a ;55 wardly iacingrbar spaced above the levelof said
‘ unit relative to the bolster-supporting cap Fmem
end portions to form an elongated recess open.
‘ ber‘to' accommodate shifting of'a bolster-mounted ‘
ing inopposite directions to receive the oppositely
i on the ‘cap member relative to the spring-seat
facing hooked lower ends .of the friction plates.
1 member without substantial movement of the
10. In a railway'truck spring brake structure,
I plates relative to each other.
~
‘ £60 a spring carrier plate having spaced areas _for
4. Adevijce-as described in claim 1,
which
the connection between the cap member and-the
. remainder-of the device includes elements slidable
; .on eachother horizontally and providing for
1 movement of the cap member, laterally with’ re <35
‘ spect to the remainder of the device withoutsub
mounting springs and having an elongated slot
between said areas, there being upstandinglugs
at the ends of said slot each having an upwardly
.extendingrecess in its lower surface’ opcningyto
wards the other lug, ‘arfriction device anchor ,
member positionedin saidslot with its ends'piv
.stantial-m-QVement of the frictionally engaged
otally received in .said recesses, and an upright
‘
,rfriction plate structure s ecured ' to said anchor
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platesrelativejto each other.
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, .5. .A structure as described in claim 1 in which
the Jf-rictionallyengaged-surfaces of the platesdi
member.
E70
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ARTHUR C.1DAVIDS,ON,.1
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