close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2411279

код для вставки
Nov. 19, 1946.
'
2,411,279
E. H. LEHMAN
FRICTION SHOCK ABSORBER
'
Filed Jan. 31, 1944
~ Ill
44
1
.Zrwenz‘ar
fiwarziffleéxrwz,
.
'
Patented Nov; 9, 1946
2,411,279
] ‘UNITED. STATES PATENT OFFICE » W
FRICTION SHOCK ABSORBER
Edward H. Lehman, Chicago, Ill., assignor to
W. H. Miner, Inc., Chicago, 111., a corporation of
Delaware
Application January 31, 1944, Serial No. 520,486
6 Claims.
This ‘invention relates to improvements in
friction shock absorbers, especially adapted for
snubbing or‘ dampening the action of railway
car truck springs.
‘ '
(01. 261-9)‘
mechanism, and are spaced symmetrically about
the central vertical axis of said post. The
grooves are transversely curved and present
three concave, longitudinally extending, friction
surfaces "-44-", which converge toward-the
One object of the invention is to provide a
friction shock absorber including a tapered fric
tion post and relatively movable spring friction
upper end of the post. Below the head I: of the
post, the latter is provided with three grooves
members, slidably engaging the post, wherein
lB-lB-IS, which are in alignment with the
grooves |3—l3—l3, but of greater depth.
.
resilient bars embracing the post.
10
The follower B is in the form of a heavy disc
A more speci?c object of the invention is to
like plate having a centrally disposed, depend
provide a friction shock absorber, comprising
ing, solid, cylindrical boss l6 thereon. The fol
end followers; a tapered friction post projecting
lower B is also provided -with a centrally dis
from one of said followers; a plurality of spring 7 posed, upwardly opening seat ll adapted to re
bars fixed to the other follower and surrounding 15 ceive the usual spring centering projection of
the post and having lengthwise sliding engage
the upper spring plate of a truck spring cluster.
ment therewith; and a spring surrounding said
The boss I6 of‘ the follower B is further pro
post and bars and bearing at opposite ends on
vided with three vertically extending, cylindrical
said followers to yieldingly resist relative longi
openings lB-lB-IB, which are spaced sym
tudinal movement of the post and friction bars.
20 metrically about the central vertical axis of the
Other obiects of the invention will more clear‘ .
mechanism. As clearly shown in Figures 1 and
iy appear from the description and claims here- _ 3, the openings I! also extend through the disc
inafter following.v
‘
>
portion of this follower.
In the drawing forming a part of this speci?
The friction bars D, which are three in num
cation, Figure 1 is a transverse, vertical, sec 25 ber, are of spring steel and form the spring fric
tional view of-myv improved shock absorber, on
tion members of thedevice. These bars are of
two radialplanes at an angle of _120° to each
truly circular, transverse cross section :and slid- ,
other, corresponding substantially to the line
ingly ?t the transversely curved friction surfaces
l-l of Figure 2, the friction bars being shown
Il-ll-ll of the post C. The three bars
in elevation. Figure 2 is a transverse. horizontal,
D—D—D depend, from the follower 3 having
sectional view, corresponding substantially to
their upper ends ?xed in the openings l8-l8-l8,
the line 2-2 of Figure 1. Figure 3 is a top plan
as clearly shown in Figure '1. To secure the
view of the improved shock absorber. Figure 4
bars in place, they are preferably welded to the
is an elevational view of the friction post.
follower B, as indicated at I9. In the assembled
My improved‘shock absorber comprises broad 85 condition of the mechanism, the lower and per
ly a pair of end followers A and B; a friction post
tions of these bars, which embrace the post C
C formed integral with one of said followers;
on three sides’, are ?exed outwardly or spread
three friction spring bars D-D-D ?xed to the
apart, as shown in Figure 1, said lower end por
the spring friction members are in the form of
other follower; and a spring E.
'
,
The follower A is in the form of a heavy disc
tions being inclined to correspond with the in- ,
40 clination of the friction surfaces of the post and
like plate having an upwardly extending, central,
cylindrical enlargement or boss Ill. The follower
A has a downwardly opening, central seat ll,
adapted to accommodate the usual spring center
ing projection of the lower spring plate of the 45
truck spring cluster of a railway car.
'
The friction post C is formed integral with
the follower A and projects upwardly from the
boss Ill and has its vertical axis coincident with
contact with said friction surfaces substantially .
throughout the length of the latter.
The spring E comprises a relatively heavy coil
surrounding the ‘post C and the spring‘ friction
bars D-D-D and bearing at its top and bot
tom ends on the followers 18 and A, respectively.
The spring E is preferably so proportioned that
it is under initial compression when‘ the shock
absorber is in assembled condition between the
the central vertical axis of the mechanism- The 50 top and bottom spring follower plates of the
upper end of the post is slightly enlarged and
truck spring cluster of a railway car.
presents a 'head portion 12. The head portion
My improved friction shock absorber prefer
I 2 is upwardly tapered and has three longitudi
ably replaces one of the spring units of a truck
nally extending, exterior grooves , l3—|3—l3,
spring cluster of a railway car, being interposed
which are inclined toward the center of the 65 between the top and bottom spring follower
2,411,279
4
3
plates of said cluster. However, more than one
of said shock absorbers may be employed with a
spring cluster, the same being substituted for
two ormore of- the spring units of the same.
3. In a friction shock absorber, the combina- '
tion with a tapered friction post; of three fric
tion spring bars. symmetrically spaced about the
axis of the mechanism and surrounding said post,
and having lengthwise sliding engagement there
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 follow
‘ ers A and B are moved relatively toward each
other against the resistance of the spring E, car
.
lower and post, toward each other lengthwise of
the mechanism.
with, said bars being rigidly supported against
spreading action at their outer ends and having
l0 the inner ends thereof embracing the post; and
rying the friction post Cand spring friction bars
therewith, and effecting relative lengthwise move
spring means yieldingly opposing relative length
wise movement of said post and bars toward each
other.
4. In a friction shock absorber, the combina
spring bars are spread apartas the compression 15 tion with a tapered friction post; of, a follower;
three friction spring bars surrounding said post,
of the mechanism progresses, the same being
having their outer ends rigidly ?xed to said fol
?exed outwardly, and, due to their inherent resil
lower against spreading action, and having their
iency, progressively increasing the pressure on
inner end portions embracing said post in length
the post and the frictional resistance produced.
wise sliding engagement therewith; and spring
The action of the truck springs is thus effectively 20 means
yieldingly opposing relative lengthwise
snubbed or dampened. Upon recoil of the truck
movement of said post and bars toward each
springs, the spring follower plates of the cluster
other.
are separated and the spring E is free to expand,
5. In a friction shock absorber, the combina
returning all of the parts to the normal posi
tion with ‘a pair of end followers relatively mov
25
tion shown in Figure l.
able toward and away from each other, length
I have herein shown and described what I now
wise
of the mechanism; of a tapered friction post
consider the preferred manner of carrying out
projecting inwardly from one of said followers;
my invention, but the same is merely illustrative
three‘ friction spring bars ?xed to the other fol
and I contemplate all changes andmodi?cations
that come within the scope of the claims ap 30 lower and projecting toward said post, said bars
surrounding said post and having their inner
ment .thereof with resultant friction therebe
tween. Due to the tenet of the post, the friction
pended hereto.
I claim:
1. In a friction shock absorber, the combina
tion with a friction post having longitudinally ex- 7
end portions embracing said post in lengthwise
sliding engagement therewith, said bars being
spaced symmetrically about the central longitudi
friction bars‘ surrounding said post, and having
posite ends bearing on said end followers, respec
axis of the mechanism; and a spring sur
tending, transversely curved friction surfaces; of 35 nal
rounding said post and bars and having its 0p
a plurality of cylindrical, inherently resilient
lengthwise sliding engagement with the friction
surfaces thereof, said bars being'rigidly supported
tively.
6. In a friction shock absorber, the combina
tion with a pair of end followers relatively mov
against spreading action at their outer ends and 40
able toward and away from each other, length
having the inner ends thereof embracing the post;
wise of the mechanism; of a friction post pro
and spring means yieldingly opposing relative
jecting inwardly from one of said followers, said
lengthwise movement of said post and bars to
post having three concave, exterior, 1ongitudi-_
ward each other.
2. In a friction shock absorber, the combina 45 nally extending, friction grooves ‘symmetrically
spaced about the longitudinal central axis of the
tion with a tapered friction post having length
mechanism, said grooves extending to the outer
wise extending, transversely curved friction sur
end
of the post and converging inwardly toward
faces; of a follower provided with a plurality of
said axis; three cylindrical friction spring bars
openings therethrough; a plurality of inherently
resilient, round bars surrounding said post, said 50 spaced symmetrically about said axis, said bars
being ?xed at one end to the other follower, pro
bars having their outer ends rigidly ?xed in said
jecting toward said post, and having sliding en
openings of the follower against relative spread
gagement respectively within the friction grooves
ing apart, and having their inner end portions
of said post; and a spring surrounding said post
embracing said post in lengthwise sliding en
and
bars and having its opposite ends bearing
55
gagement with the friction surfaces thereof; and
on
said
end followers, respectively. ,
a spring surrounding said post and :bars and
‘EDWARD H. LEHMAN;
yieldingly opposing relative movement of said fol
Документ
Категория
Без категории
Просмотров
0
Размер файла
336 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа