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Патент USA US2407156

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. Sept; 3,. 1946;
J. ‘T. HORNE ‘
2,407,156
' TRAILER BRAKE
Filed Aug. 17, 1944
'2 Sheets-Sheet 1 ‘
Sept.*3, “1.946-
'
‘H, HORNE
'
v
2,407,156‘
TRAILER BRAKE
File-d Aug. 17, 1944
2 Sheets-Sheet 2
Inventor
2,407,156
Patented Sept. 3, 1946
UNITED“ STATES PAT; ENT QFFIC s
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2,407,156‘
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TRAILER BRAKE 2
John ‘TheoHorne, LaytonhUt‘ali
ApplicationrAug-ust- 17, 1944, S‘erialNor 549,869'i
lqGlaimv, (Cl. 188—142.)
1;
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2 I- secured thereto bygheavy screws 422 engaged- in
like and ‘more particularly Ito‘ an: actuatingide'vice
for-such":aabrakingsystem,
211
20 'is cut .intoycasingd I "closed by aEGIOS'lII-‘I'G plate
Thisinvention'relatestocabrakefontrailersand
suitable threadedftapertures in"; the ~ end-‘wall; of
'
easing I i: Plate "2| :hasazcentrallydisposed‘apers
Aiprimary object'of ‘this ‘invention is the-pros
vision of an improved mechanism actuatedhbyrthe 5 tures 23*] therethrough; through which extends
draw-‘bar :I 5.T A‘ suitable 1 dust: shield 1247' or‘ rubber
momentum of a-trailer or‘similar‘vehicleI-fonxap
or "similarl?exiblermaterialis secured‘about drawsv
plying the brakesitoa trailerswhenritheaforward
bar I5jasuby a retaining ring;-25:and<heldrto cover
speed? of the towing,- vehicle is'w-decreased;
plate if I 1 as; by - means». of; screws : 237i to; preclude
An additional important objectris-the provision
of means whereby'the brake actuating-mechanism 10 the ingress of dust OIXTO'DhEIYi foreign-matter "130717116
may be “rendered ‘temporarilyinoperativacasp for.
Positioned; about‘ drawr-ban I 5vwithin: recessjl)
example, when backing thetrailenbythé'stowing,
interior:ofitheimechanismn
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L
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is la heavy; duty :compressi-on shock i spring; 21 -one
vehicle.
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_
>
end of whichiabuts-theinner face Lof—c1osure=mem.;
further objeot?isll-th‘e provisior-rwff means
her-:21 , the other; endloii'springa? II ‘ is seated against
whereby-?theobra‘k‘e=pressure1-1mayvbe readili‘y:.'ad; 15
justed‘linrthe system‘;
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a :Washer 28.; of 'steel‘: or .Ythe:;like1 positioned-"won
draw+bar I 5" and ‘held in; .positi‘omby; a pair‘;- of
‘
Alstill further object isl-tl'i'el provision‘ 30f:1 avhiy=
lockinglsnuts129*andai'30rmounted on-ma suitably
draulic" brake'l'actuati-ng‘ device-1 which r wii'liibe
» threaded'porti'ontlof draw--bar..;l*’5: Thus'itrwill
e?icient' in operation, and ‘ relativelytsimpléi and 20 be seen that‘ by :varying. the? positions ‘of 1311135329
and 30 thewcompression of :theaspri-ng“ '21 maybe
inexpensive i-toi'install‘ and manufacture.1 ‘
sturdysand-durable in-Jconstruction, reliable and
varied ‘as desired; Thezsmingr?dsmt the-com
‘ pression type .andiis normallyiinactive androffers
no 4 pressure “on .the: draw-:bar ‘:I 5eto» compress; ‘the
Other objects‘- will in part'be obvious and‘in‘part
her-pointed ‘ out‘ hereinafter and‘l disclosedi'in: the
accompanying'drawi-ngs 'wherein lthere: is shown
a'ipreférred-iformlrof this linventiveiwconceptt"
In'thedrawings:
25
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Figure 1! is a1 perspective" view‘ showing the
brake actuating mechanism of Ithis-invention"- as
applied to‘ a=trai1ér~ and artowirrg» vehicle.
fluid by the pistons?‘l";and:33r'when~:the‘ vehicle
is ‘stationary 1‘ on level ground; Spring: 21 ~is-ralso
heavy: enough? with: comparison" to spring‘ ' 52;‘so
that: adjustment of "L the-tension :of spring"; 5 2 : will
have no appreciable effect on: spring" 21 orz'on
Figured is a sectionalwiew~taken~ longitudinally 30 draw-bar l 5' when the brakeis: in‘neutral position:
Positioned on ,the “opposite :side a-of": nut .v30wisra
through’ the: center of‘ the device shown imFig-ure
second» steel :collar ‘32 zandiva rubber :‘ShOCk washer
1.
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Figure u3'1isj~a=»perspectiveeviewtofi‘certain' con-u
adaptedi to prevent possible stripping‘: of
structional detail-s shown in conjunction with the
wiringzdiagram fdr operation thereof, and?
Figure l 4~is an enlarged ‘fragmentary sectional
view ‘of certain operating parts ‘disclosed ‘in-Figure
threaded.‘ portion-Q31 if," for; any reason: the lay:
2 showing the same in adi?erent position-chad!
raib‘ore‘ 3‘5 "andrite'rininates ‘in/11a .zreducedtportion'iii
justment.
‘
Like reference numerals refer to like parts
throughout the several views of the drawings.
Having reference now to the drawings, the
brake actuating device of the instant invention
generally indicated at 55 is comprised of a casing
draulic system‘ (to >. be -' describedi'hereinafter).
should become - inoperative; ' and ‘ drawébanrl 5 be
forced.‘ inwardly until'the washer :st‘rikesxth'e: bOte
tom ofcr‘ecess 529;‘ I The-draw-rbar: I Euzextends: into
upon which are positioned and secured two spaced
plunger leathers 31 and 38, the purpose of which
will be described hereinafter.
A reservoir 41] for hydraulic fluid is secured as
by bolts 4| to the top of casing II and provided
It having a depending lug 52 with bolt holes !3 45 with an inlet 42. A ?ange 43 ‘is formed on the
interior wall'of the reservoir about inlet 42 in
tlierethrough to which. are adapted tobe secured
order to prevent the complete ?lling of the eas
the towing arms is of a trailer of any desired
ing with hydraulic ?uid in order to accommodate
type (not shown). One end of a draw-bar I5
fluid from the hydraulic system when the pres
extends outwardly from casing l l and is adapted
to be secured in. any desired conventional‘ manner ‘'
to a towing vehicle. Such connection may take
the form of a ball and socket type joint I6 se
cured to a clamp I1 adapted to be ?tted to the
bumper l8 of any desired type of towing vehicle
(not shown). As best shown in Figure 2 a recess '
sure therein is released in a manner to be de
scribed hereinafter. Inlet 42 is interiorly threaded
and is adapted to be closed as by a threaded plug
44. Intake and bY-pass ports 45 and 46 are cut
through the wall of casing II between reservoir
49 and bore 35, and an outlet port 41 leads from
2,407,156
bore 35 to a tube 48 leading to any desired type
of hydraulic braking mechanism associated with
the wheels of the trailer.
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The end of bore 35 is internally threaded for a
substantial distance therealong and has posi
4
3, suitable hot and cold lines 64 and 65 lead from
a battery 66 to opposite terminals of thesolenoid
62 and the ?ow of current is controlled by a
switch 61 located in a position to be readily acces
sible to the driver of the vehicle. In practice it
is preferred that lines 64 and 65 be contained in
a suitable conduit 58. In Figure 3, switch 61 is
shown in open position and correspondingly valve
tioned therein an adjusting nut 49. A closure
nut 50 passes through a gasket 5| and serves
effectively to seal the end of the bore. A spring
52 is positioned within bore 35 between the inner
55 is shown in closed position. When it is desired
end of adjusting nut 49 and plunger leather 38. 10 to open valve 55 switch 61 is closed and acts
It will now be seen that as the speed of the tow
through the solenoid and its associated plunger
ing vehicle is reduced, continued forward travel
6| to move rod 59 and hence link 58 to rotate
of the trailer at the same speed causes an inward
valve 55 to the position shown in Figure 4. When
telescopic movement of the draw-bar I5 and a
it is desired to return the trailer brakes to service,
corresponding movement of the plunger at its ex lo switch 61 is opened and the current energizing
tremity 36 and that such plunger acting on the
the solenoid accordingly cut-o? whereupon the
?uid in the brake system compresses the same to
valve 55 is returned to closed position in any de
act in a known manner to apply the brakes of
sired manner as by a compression spring within
the trailer. When the trailer has been slowed to
casing 62 acting on plunger 6| .
‘a degree commensurate with the speed of the ‘
Now from the foregoing it will be seen that
towing vehicle it will be readily apparent that
there is herein provided a trailer brake actuating
the load is again taken up by the draw-bar l5 and
mechanism which accomplishes all the objects of
cushioned by spring 21. It will also be seen that
this invention and others including many ad
the compression of sensitivity spring 52 may be
vantages of great practical utility and commercial
readily adjusted by rotation of adjusting nut 49 > importance.
'
after removal of closure nut 50 and that due to
As many embodiments may be made of this
such adjustment the pressure required to operate
inventive concept and as many modi?cations may
the braking systemmay be varied at will.
be made in the embodiment hereinbefore de
Under certain conditions as, for example, when
scribed and shown in the accompanying draw
backing the trailer by means of the towing ve I"; l) ings, it is to be understood that all matter here
hicle it is desirable that inward telescopic move
in is to be interpreted merely as illustrative and
ment of the draw-bar l5 and its corresponding
not in a limiting sense.
plunger should not actuate the brakes of the
I claim:
trailer. Accordingly, means are provided to re
A combined trailer hitch and brake actuating
lease the pressure in the hydraulic system under ‘ mechanism which includes a casing adapted to
such conditions at the will of the operator. Such
be attached to the towing arms of a trailer ve
means take the form of a valve 55 comprised of a
hicle, said casing having an axial bore opening
turning plug having a slot 56 therethrough
adjacent one end into an enlarged chamber, a
mounted for rotation in a port 51 between reser
plug closing the end of the bore opposite that
voir 40 and bore 35 and positioned at a point 40 opening into the chamber to form a ?uid tight
beyond the maximum path of travel of the
joint, a draw bar, one end of the draw bar being
plunger. Obviously, when the valve is turned to
adapted to be attached to a towing vehicle, the
open position, that is, with aperture 56 aligned
opposite end of said draw bar telescopically en
with port 51, compression of the ?uid within the
tering the bore in the casing, means yieldingly
brake system by plunger 38 is impossible as ?uid
connecting the draw bar to the casing, so that
is permitted to escape through the port back into
when pull is exerted on the draw bar the casing
the reservoir 40 which, as previously pointed out,
will be moved, non-compressible ?uid Within the
is nevercompletely full in order to allow for such
bore between the end of the draw bar and the
escape of ?uid from the system when necessary.
plug, a pipe connecting the bore in the casing
One end of the turning plug 55 extends outwardly 50 with the braking system on a trailer vehicle
through the side wall of casing I l and has secured
whereby when the draw bar telescopes into the
thereto a lever 58 to which is secured, pivotally,
bore the .?uid contained therein will be forced
one end'of a rod 59, the other end of which is
into the braking system on the trailer vehicle to
pivoted as by a pivot pin 60 to the plunger 6!
set the brakes thereon and manually controlled
of a conventional solenoid contained in a casing
means to by-pass the ?uid and avoid building
62 secured to the side wall of casing H, a suit
pressure in the trailer vehicle braking system
able ?exible dust shield 63 being provided‘to pre
when the trailer is being backed by the towing
clude the ingress of foreign matter to the work
ing parts of the solenoid. As indicated in Figure
vehicle.
JOHN 'I'I-IEO HORNE.
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