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Патент USA US2405644

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2,45,644
a. E. DATH ‘
FRICTION SHOCK ABSORBER
Filed Dec. 2, 1943
'
Patented Aug. 13, 1946
2,405,644. A
UNITED STATES PATENT OFFICE
2,405,644
FRICTION SHOCK ABSORBER
George E. Dath, Chicago, 111., assignorv to W. H.
Miner, Inc., Chicago, 111., a corporation of Dela
Ware
1
1 Application December 2, 1943, Serial No. 512,521
14 Claims. (Cl. 267-9)
2
This invention relates to improvements in fric-r
tion shock absorbers, especially adapted for use
in connection with truck springs of railway cars
a relatively heavy, horizontally disposed, out
turned base ?ange 12 at the other end. The base
flange 12 is curved and extends completely around
for snubbing or dampening the action of the
the half section. At the base ?ange end portion
truck springs.
thereof, the wall [0 is inwardly enlarged or thick
One object of theinvention is to provide a
ened, as indicated at 13. The inward enlarge
_ combined‘ spring and friction shock absorber of
ment I3 is provided with a transversely extending
simple design which may be readily assembled
bearing projection 14, which is rounded to pro
and wherein the parts are held in assembled re
vide a cylindrical bearing surface. Between the
lation and held against separation by shouldered 10 bearing projection I4 and. the stop ?ange II, the
engagement between certain of the parts thereof.
friction member or half section of the cylinder
A more speci?c object of the invention is to
is provided with a longitudinally extending in
provide a shock absorber ‘of the character indi
terior friction surface 15, which is transversely
cated comprising a friction shell, which is divided
curved.
lengthwise into two sections which are slidable 15 _~The friction members or shell sections A and
lengthwise with respect to each other, and fric
B’ are reversely arranged end for end with the
tion shoes, each shoe having sliding engagement
longitudinal edges of the side walls lll—i0 there
with one of the sections of the friction shell and
of' in lengthwise sliding engagement, that is, the
hinged engagement with the other section of the
section B is in inverted position with respect to
shell and slidable in unison therewith, wherein 20 the section A, the latter having its ?ange l2 at
relative movement of the shoes and sections of
the bottom of the mechanism with the wall 10
the shell with which they have sliding engage
projecting upwardly therefrom and the section
ment is yieldingly resisted by spring means which
B having its ?ange 12 at the top of the mech
also urges the shoes into frictional engagement
anism with the wall 10 depending therefrom.
with the friction shell sections by tilting said 25 - The friction shoes C and D are of like design.
shoes against said shell sections with which they
Each shoe is in the form of a heavy block having
have sliding engagement.
'
a longitudinally extending, transversely curved or
Other objects of the invention will more clear
rounded friction surface I6 on the outer side
ly appear from the description and claims here
thereof. Each shoe is provided with a laterally,
inafter following.
_
30
In the drawing forming a part of this speci?
cation, Figure 1 is a transverse vertical sectional
view of my improved shock absorber, said section
being on a plane coincident with the central ver
tical axis of the mechanism. Figure 2 is a top
plan view of Figure 1. Figure 3 is a horizontal
sectional view, corresponding substantially to the
line 3—3 of Figure 1.
Referring to said drawing, my improved shock
absorber comprises broadly two heavy, transverse
ly curved, friction members or half friction shell
sections A and B, together forming a complete cy
lindrical friction shell which is split lengthwise;
two friction shoes C and D; and a spring resist
ance E.
.
The friction shell sections or members A and
B, which together form the complete, longitudi
nally split, cylindrical friction shell, are identical,
each section or friction member forming one half
of the shell, which is divided lengthwise. Each
friction member or half section of the shell, which
is preferably in the form of a casting, comprises
a relatively thick, longitudinally extending, trans
versely curved, side wall 10, having an inturned,
relatively narrow stop flange H at one end, and
outwardly extending. horizontally disposed ?ange
I‘! at its base, which is of arc-shaped form. ‘Be
tween the base ?ange I1 and the friction sur
face l6, the outer side of the shoe is cut away,
or inwardly offset, providing a horizontal stop
shoulder 18 at the inner end of the friction sur
face. On the inner side, each shoe is provided
with a lateral enlargement 19 at the base por
tion thereof; A transversely extending concave
bearing seat 20 is provided in said enlargement
40 ill for a purpose hereinafter described.
The‘shoes D and C are disposed respectively at
the top and bottom of the mechanism with the
friction surfaces l6—l6 thereof respectively en
gaged with the interior friction surfaces 15-15
45
of the friction members, or friction shell sections
A and B, and the base ?anges 17-11 thereof in
vertical alignment with the ?anges of said fric
tion members A and B, respectively. The shoe.
C is hingedly or pivotally connected to the fric
tion member A by means of the bearing projec
tion I 4 of the member being engaged in the seat
20 of the shoe. The shoe D is connected to the
friction member B in a similar manner, the bear
ing projection I4 of the latter being engaged in
55 the'seat 20 of said shoe. The shoe C has a round
2,405,644
4
3
into proper position it is righted to engage the
seat 20 thereof over the bearing projection 14
ed bearing projection 2| above the seat 20 which
forms a fulcrum on which the shoe may rock on
of the member B and the shoulder 18 underneath
the stop ?ange ll of the member A.
The improved shock absorber illustrated herein
preferably replaces one of the spring units of
the upper side of the enlargement I3 of the fric
tion member A, said upper side being preferably
curved for this purpose. The shoe D has a simi
lar bearing projection below the seat 29 thereof
which serves the same purpose as the projection
a truck spring cluster of a railway car; however,
2| of the shoe C and is also indicated by 2i.
As shown most clearly in Figure l, the ?anges
several of such units may be employed in a spring
I’! of the shoes 0 and D are of lesser thickness
The operation of my improved shock absorber
is as follows: Upon the spring cluster of the truck
of a railway car being compressed between the
spring follower plates of said cluster, the shock
cluster replacing two or more units of the same.
than the ?anges of the friction members A and .
B, and the ?ange H at each end of the mecha—_
nism is offset slightly in vertical direction with
respect to the ?ange l2 at the corresponding end
of the mechanism. In other words, the flange
ll of the shoe C normally has the top surface
absorbing‘ unit, which is disposed between said
follower plates, is compressed therewith, thereby
forcing the friction members or shell sections A
thereof aligned with the top surface of the flange
and B to slide lengthwise with respect to each
l2 of the friction member A and its bottom sur-'
other and the shoes C and D to slide length
wise on the friction surfaces of said friction
members B and A, respectively. At the same time,
face upwardly offset with respect to said ?ange
!2, while the ?ange H of the shoe D has its bot
one to the pressure exerted by the spring E on
the base ?anges of the shoes. the latter are tilted
into tight frictional contact with the friction sur
faces of the members A and B. High frictional
tom surface aligned
the bottom surface of
the flange H of the friction member ‘BY and its
top surface offset downwardly with respect to
the top surface of said flange 12. "It will thus
be evident! when'th'e'shocl; absorber is place
between the spring plate follower members of
resistance is thus provided to snub the action of
the truck springs.
the follower plates of the
truck springs. are Separated! due to recoil of the
a truck spring‘ cluster,v the offset arrangement
of the flanges 42 and I1 provides the required
clearance‘ to permit necessary swinging move
springsx the friction, member A and shoe C are
separated with respect to the friction member
lengthwise. direction. by
ment of the shoes about their hinged connections 30: B and the shoe D}.
the expensive action of; the Spring thereby ro
with the friction members or friction sheli sec.
storing all of the Parts to normal full release
tions to, place the friction surfaces of the shoe
position, lengthwise. movement of the shoes with
and friction member in tight'frietion'al con-_
respect to the friction members A. and B, being.
tact.
The spring resistance E comprises a. single coil 35. limited by the stop flanges ll of the latter com
ing into engagement with the shoulders l8 of the
which surrounds the friction shell sections or
shoes D and (3-,
friction members‘A and B and ‘closely embraces
I have herein shown and, described what I now
the latter. The spring resistance has its top
consider the preferred manner of carrying out
end bearing on the'?ange 12 of the friction mem
(0 my invention,_ but the same is merely illustrative
bottom
ber B and
end the
bearing'on
flange (‘Itheofflange
the shoe
I2 ofD1!the
andfric
and 1, contemplate all changes andv modi?oations
that come Within the scope of. the claims. op
tion member A and the flange‘ I‘! of the shoe Q,
penood hereto.
and said spring E in the assembled condition of
the mechanism is under initial compression,
I claim;
.
thereby yieldingly urging the shoes to’ tilt‘ against
the friction‘ surfaces'of ‘the friction‘ members to
l- In" a friotiou shock absorber, the combina
tion with. a. friction member; of a second friction
member, said members having; friction surfaces
on the inner sides, thereof; apair of friction shoes
assure the‘ desired frictional ‘ resistance. between.
the‘parts.
V
V
’
‘
'
between said members, one of, said shoes being
proved
‘ Whenshoclg
assembled
absorber
with the
is held
truckcentered
springs, by the
50 pivoted to said ?rst named member and having
usual spring centering projections of‘ the top and~
loottomspitine
the base'portions
plates
of seated
the. friCtihnfmembers
inpooliots 2.2-2},and
shoes, each pocket 22 being formed partly in} one‘
sliding frictional. engagement, with the friction
oer-fete of Said second named member. the other
Shoo looms pivoted to Said, Second named, member
and having sliding engagement with said ?rst
hinged
of the friction
thereto. members and
' the shoe
‘
which
55
posing; relative. ‘sliding movement of- said shoes
and. members toward each other andv pressing
In assembling the mechanism, the shoe Q is
the’ shoes against the friction, surfaces of said
?rst connected to the, friction member A by. en
gaging the bearing projection in the seat, 28 of
the shoe. The coil spring lit is then telescoped
over the assembled parts?d‘ and‘ Q, After- the
spring E has been placed in position, the friction
named member; and spring resistance moans op
members.
60
2. In al‘friction shoal; absorbert the combina
tion with a friction, member having a laterally
projecting flange. at the upper end" thereof ;_ of a
member B is inserted within‘ the spring through
the open upper end of the, latter, the shoe C. be?
second friction member having a laterally pro
jecting ?ange at, the lower end‘ thereof, said mem
the stop ?ange ll of the friction member B.
When the ?ange H has passed the shoulder l8,
thereof; a. pair of friction shoes between said
ing‘ tilted so'that the'shoulder (8 thereof clears 65.
the, shoe is permitted to swing to its normal posi
tion with the shoulder 18 engaged over the flange
bers having friction surfaces on the inner sides
members, onfo of said shoes boine pivoted. to said:
?rst named. member and bovine, sliding fliotionol.
engagement, with the friction. surface of saidsw
one comer; momben, saidshoe having a laterally
ll. Next, the shoe D is applied, the same being 70
projecting flange at the. upper’ end thereof,_ the
inserted with the coil spring between; the fric
other shoe being pivoted to said second named»,
tion members B, and A, while held in‘ tilted posi
tion to clear the flange ll of the friction mem
member and having slidingvengagvoment with said,
first named member, said last named; shoe-having
her A and the bearing projection Id; of the frice
tion member B. When the shoe has been brought 75 ‘ a laterally projecting flange at the lower- end
2,405,644
5
thereof; and spring resistance means interposed
6
tion with a two-part cylindrical friction shell die
between the ?anges of said members and shoes
yieldingly resisting relative movement of said
shoes and members toward each other lengthwise
of the mechanism, andtilting movement of said
shoes away from the friction surfaces of said
vide'd lengthwise into opposedhalf sections, said,
half sections having friction surfaces on-the inner.
sides thereof, said half sections being slidable
lengthwise with respect to each other; of a pair,
of friction shoes, said shoes being respectively at.
members.
,
opposite ends ofsaid divided shell, said shoes be
3. In a friction shock absorber, the combina
inggpivoted to said opposed half sections respec
tion with an upper friction member having a
tively andhaving sliding frictional engagement.
laterally outwardly projecting ?ange at the upper l0 withthe. half section opposed .to the half section
end ‘thereof; of a lower friction member having
to which it is pivoted, one of said half sections
a laterally outwardly projecting ?ange at the
having a laterally outwardly projecting ?ange at
lower end thereof, said members having longi
one end of said shell, and the other half section
tudinally extending friction surfaces on the inner '
sides‘thereof; a pair of friction shoes between
said members, said shoes being disposed respec
tively at the upper and lower ends of the mecha-'
nism, said upper shoe being pivoted to said upper
member and having sliding frictional engagement
with the friction surface of said lower member,
said shoe having a laterally outwardly project
ing ?ange at the upper end thereof, said lower
shoe being pivoted to said lower member and
having sliding frictional engagement with the
friction surface of said upper member, said last
named shoe having a laterally outwardly project
ing ?ange at the lower end thereof; and spring
resistance means bearing respectively at its top
and bottom ends on the ?anges of said upper
havinga laterally outwardly projecting ?angeat
the other end, and said shoes having laterally oute ‘
, wardly projecting ?anges at their outer ends; and
spring, resistance means surrounding saidtwo
part shell and bearing at opposite ends on the,
?anges of said shoesand half sections of the
shell.
.
,
.
7. In a friction shock absorber, the combination
with a longitudinally divided, cylindrical fric
tion shell, comprising a half section having a lat-.
erally outwardly projecting ?ange at one end.
and a second half section having a laterally out-_
wardly projecting ?ange at the end thereof re
mote from the ?anged end of said ?rst named
half section, said half sections having longitu
dinally extending, transversely curved, opposed,
member and shoe, and the ?anges of said lower 30 interiorrfriction surfaces; of a pair of friction
member and shoe, yieldingly opposing relative
shoes having frictional sliding engagement re
approach of said upper and lower members and
spectively with thejfriction surfaces of said ?rst,
shoes.
and second named half sections and pivotal en
4. In a friction shock absorber, the combina
gagement respectively with said second and ?rst
tion with upper and lower friction members mov
named sections, said shoes having laterally out
able lengthwise with respect to each other, each .
wardlyrprojecting ?anges at the outer ends there
friction member having a transversely curved,
of; and spring means surrounding said friction
longitudinally extending friction surface on the
shell and bearing at opposite ends respectively on
inner side thereof, said upper member having a
the ?anges of said respective half sections of the
laterally outwardly projecting ?ange at the upper 40 shell and respectively on the ?anges of said
end thereof, and said lower member having a lat
shoes.
erally outwardly projecting ?ange at the lower
'8. In a friction shock absorber, the combina
end thereof; of upper and lower friction shoes
tion with a friction member; of a second friction
having longitudinally extending, transversely
member, said members having friction surfaces
curved, friction surfaces, said upper and lower 45 on the inner sides thereof; a pair of friction
shoes being pivoted respectively to said upper and
shoes between said members, one of said shoes
lower members and having sliding frictional en
being pivoted to said ?rst named member and
gagement respectively with the friction surfaces
having sliding frictional engagement with the
of said lower and upper members, said upper shoe
friction surface of said second named member,
having a laterally outwardly projecting ?ange at 50 the other shoe being pivoted to said second named
the upper end thereof, and said lower shoe having
member and having sliding engagement with said
a laterally outwardly projecting ?ange at the
?rst named member, said shoes having shouldered
lower 'end thereof; and spring resistance means
engagement with said members to limit relative
interposed between the ?anges of said upper
longitudinal separation of said shoes and mem
member and shoe and the ?anges of said lower 55 bers; and spring resistance means opposing rela
member and shoe opposing relative approach of
tive sliding movement of said shoes and members
said members and shoes.
toward each other and pressing the shoes against
5. In a friction shock absorber, the combina
the friction surfaces of said members.
tion with a two-part sectional friction shell di
9.. In a friction shock absorber, the combination
vided lengthwise into half sections, said sections 60 with a friction member having a laterally pro
having friction surfaces on the inner sides there
jecting ?ange at the upper end thereof; of a sec
of, said sections being slidable lengthwise with
ond friction member having a laterally project
respect to each other; of a pair of friction shoes
ing ?ange at the lower end thereof, said members
at opposite ends of said sectional friction shell,
having friction surfaces on the inner sides there
the shoe at one end of said shell being pivoted to 65 of; a pair of friction shoes between said members,
one of said half sections and having sliding fric
one of said shoes being pivoted to said ?rst named
tional engagement with the other half section,
member and having sliding frictional engagement
and the shoe at the other end of the shell being
with the friction surface of said second named
pivoted to said last named half section and hav
member, said shoe having a laterally projecting
ing sliding frictional engagement with the ?rst 70 ?ange at the upper end thereof, the other shoe
named half section; and spring resistance means
being pivoted to said second named member and
opposing relative sliding movement of said shoes
having sliding engagement with said ?rst named
and shell sections toward each other and pressing
member, said last named shoe having a laterally
said shoes against said friction surfaces.
projecting ?ange at the lower end thereof; and
6. In a friction shock absorber, the combina 75 a coil spring surrounding said members and in
2,405,644
8
terposed between the ?anges of. said members and
shoes, yieldingly resisting relative movement of
said shoes and members lengthwise of the mech
anism toward each other, and tilting movement
of said shoes away from the friction surfaces of
said members.
12. In a friction shock absorber, the combina
tion with a two-part sectional friction shell di
vided lengthwise into half sections, said sections
having friction surfaces on the inner sides thereof,
said sections being slidable lengthwise with re
spect to each other; of a pair of friction shoes at
opposite ends of said sectional friction shell, the
i
> 10. In a friction shock absorber, the combina
tionwith an upper friction member having a
' shoe at one end of said shell being pivoted to one
laterally outwardly projecting ?ange at the upper
of said half sections and having sliding frictional
end thereof; of a lower friction member having 10 engagement with the other half section, and the
a laterally-outwardly projecting ?ange at the
shoe at the other end of the shell being pivoted
lower end thereof, said members having lon
to said last named half section and having sliding
gitudinally extending friction surfaces on the
frictional engagement with the ?rst named half
inner‘sides thereof; ‘a pair of‘ friction shoes be
section; and a coil spring surrounding said fric
tweensaid members, said shoes being disposed re
tion shell and closely embracing the same, said
spectively- at the upper and lower vends of the
spring opposing relative sliding movement toward
mechanism, said upper shoe being pivoted to said
each other-of said shoes and shell sections and
upper member and having sliding frictional en
pressing said shoes against friction surfaces.
gagement with the friction surface of said lower
13. In a friction shock absorber, the combina
member, said shoe having a laterally outwardly 20 tion with a two-part cylindrical friction shell di
projecting ?ange at the upper end thereof, said
vided lengthwise into opposed half sections, said
lower shoe being pivoted to said lower member
half sections having friction surfaces on the inner
and having sliding frictional engagement with
sides thereof, said half sections being slidable
the friction surface of said upper member, said
lengthwise with respect to each other; of a pair
last named shoe having a laterally outwardly pro
of friction shoes, said shoes being respectively at
jecting ?ange at the lower end thereof; and a coil
opposite ends of said divided shell, said shoes
spring surrounding said members and bearing
being pivoted to said opposed half section repec
respectively at its top and bottom ends on the
tively and having sliding frictional engagement
?anges of said upper member and shoe, and the
with the half section opposed to the half section
?anges of said lower plate member and shoes, 30 to which’ it is pivoted, one of said half sections
yieldinglyopposing relative approach of said up
having a laterally outwardly projecting ?ange at
0
per and lower members and shoes.
one end of said shell, and the other half section
having a laterally outwardly projecting ?ange at
the other end, and said shoes having laterally out
wardly projecting ?anges at their outer ends; and
' 11. In a friction shock absorber, the combina
tion with upper and lower friction members mov
able lengthwise with respect to each other, each
friction member having a transversely curved,
longitudinally extending friction surface on the
inner ‘side thereof, said upper member having a
a coil spring surrounding said two-part shell and
closely embracing the same and bearing at oppo
site ends on the ?anges of said shoes and half
laterally outwardly projecting ?ange at the upper
end thereof, and said lower member having a lat
erally outwardly projecting ?ange at the lower
end thereof; of-upper and lower friction shoes
having longitudinally extending,’ transversely
curved friction surfaces, said upper and lower
shoes being pivoted respectively to said upper
and lower members and having sliding frictional
engagement respectively with the friction surfaces
of said lower and upper members, said upper shoe
having a laterally outwardly projecting ?ange at
the upper end thereof, and said lower shoe having
a laterally outwardly projecting ?ange at the low
er end thereof, said upper member having a stop
?ange at the lower end thereof, said lower mem-'
her having a stop ?ange at the upper end thereof,
and said lower and upper shoes having shouldered
engagement with said stop ?anges to limit length
wise separation of said shoes and members; and
spring resistance means interposed between the
?anges of said upper member and shoe and the
flanges of said lower member and shoe opposing
relative approach of said members and shoes.
sections of the shell.
40
'
14. In a friction shock absorber, the combina
tion with a longitudinally divided, cylindrical fric
tion shell, comprising a half section having a lat
erally outwardly projecting ?ange at one end, and
a second half section having a laterally outwardly
projecting ?ange at the end thereof remote from
the ?anged end of said ?rst named half section,
said half sections having longitudinally extending,
transversely curved, opposed, interior friction sur
faces; of a pair of friction shoes having frictional
sliding engagement respectively with the friction
surfaces of said first and second named half sec
tions and pivotal engagement respectively with
said second and ?rst named sections, said shoes
having laterally outwardly projecting ?anges at
the outer ends thereof; and a coil spring closely
surrounding said friction shell and bearing at op
posite ends respectively on the ?anges of said re
spective half sections of the shell and respectively
on the flanges of said shoes.
GEORGE E. DATH.
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