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Патент USA US2136770

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Nov. 15, 1938.
E. WITZENMANN
2,136,770
FLEXIBLE CONDUIT
Filed March 2, 1936
_
2 Sheets—$heet 2
2,136,770
I Patented Nov. 15, 1938
‘PATENT OFFICE
‘UNITED STATES
2,136,770
-
‘
FLEXIBLE COND'UIT
‘Emil Witzenmann, Pforzheim, Germany
Application March 2, 1936, Serial No. 66,757
In Germany February 26, 1935 '
.
'
(or 138-50)
1 Claim.
This invention relates to a ?exible pipe, 1. e.‘
members a’ and b’ at the adjacent ends of the
a conduit movable in every direction, which may ' lengths of pipes overlap radially, so that a pack
be employed with equal advantage for conveying ing member 0 inserted between the ?ange mem
bers a’ and b’ is encased‘on all sides between
said ?ange members/and the longitudinally over 5
lapping end portions of said lengths of pipe, as
i conduit for the air brakes of railway carriages.
. In’ the known ?exible pipes made of helically in the case of ?exible pipes constructed of hell
,steam, gas, compressed air or liquid, and is par
5 ticularly suitable for use as a compressed air
wound metal strip, the packing members ‘are
inaccessible, with the result that when even a
10 single turn of the packing ruptures or perishes,
the whole pipe has to be discarded.
‘
-
An object of the invention is to" provide a
?exible pipe the packing of which is easily acces
sible in order'that said packing may be easily
15 and quickly renewed as and when required.
cally wound metal strip.
,
It will also be 'seen that separate packing
means at the points where the ?ange members 10
are screwed to the lengths of pipe is'inot required,
because the packing members 0 provide an ade
quate seal for preventing the issue of the 'medium
?owingin the conduit.
I
The ?ange members a’, b’ alsoserve asabut
Another object of the invention is to provide ments, for limiting the relative'movement of the
a ?exible conduit comprisinga plurality of tubu- -‘ members when the pipe is exposed to tensional,
lar members ?tted together with interposed re- _ compressional or ?exing stresses. g
Tov gain access to any packing member c the
enclosing couple of lengths of pipe 0 and b are
Broadly, a ?exible conduit according to the in
vention comprises‘ a plurality of tubular. mem-' _,relatively displaced by axial sliding and the
newable packing.
20
bers such as preferably short lengths of pipe
?tted together as by overlapping ?ange mem
bers with interposed packing in such manner as
to permit their relative ?exure.
'
.
In the simplest form of the invention, ?ange
members are screwed on or in the ends of the
lengths of pipe.
.
It is possible to arrange the aforesaid pacldng
30 members, in some embodiments, in such a way as
to provide complete sealing for the medium pass
ing through the conduit, so that no separate
packings are required at the points of attach
ment of the ?ange members, e. g., where the
?fmge membersqare’screwed to the lengths of
D De.
Various embodiments of ?exible conduits ac
' cording to the invention are illustratedby way
of example in the accompanying drawings,
40
wherein:--
'
.
pipe are then pulled apart and upon removal
of they ?ange member bf the packing member ‘0
may be renewed.
Member b’ is' then screwed
back in position, the length of pipe a. is pushed
over the fresh packing and member a’ is screwed
fast. Obviously, the packing member 0 is of such
size relative to the inner diameter of a and the
outer diameter of b- that 1‘the packing c is ini
tially compressed when the members are assem
bled, such ccmpression‘—as is'known from the
instance of ?exible tubes made of metal spirals
'being quite sui?cient for providing an adequate
seal even at the highest ‘pressures occurring in
practice inside the pipe.
.
Fig. v‘2i shows a length of ?exible conduit accord
ing to Fig. 1 in elevation, on a smaller scale,-and
Figs. 3 to 5 are fragmentary axial sectional
45
views of further embodiments.
Referring to Figs. 1 and 2, adjacent ends of -
a
_
.
Referring to Fig. 3, ity and bare adjacent, sim
ilar, stepped tubular members, the larger end
of the member b'overlapping the smaller end of
the member a.
'
Fig. 1 is a fragmentary axial sectional view of
one form,
?ange member a’ is unscrewed. The lengths of -
A ?ange member a” is screwed .
on the 'smallerwend of a, a ?ange member b’ is
‘screwed within the larger end of b, and a pack- 1
ing member 0 is interposed between said ends.
As a safety measure, the member I)’ may bese
cured against becoming loose owing to vibration 45
by means of a locking ring I)’.
, -
Fig. 4 shows an embodiment similar to that
tubular members constituted by overlapping shown in Fig. 3, but having two ring packln’gs c
lengths of pipe _a of larger diameter and b of embedded in grooves ina metal ring 0'. The
smaller diameter are provided with ?ange mem - object of this arrangement is to ensure the cor
bers “"??d'b' respectively, the ?ange member rect position of the' packing 0 when very high
a’ at each‘ioint being screwed on the end of the pressures occur, the ring c’ preventing excessive
‘length of pipe a and the ?ange member b’ being axial movement of the packing by abutting either
screwedinto the end of the'flengthof pipeb.
its will be seen or the drawings, the ?ange
"l.
v against ?ange member a’ or ?ange member b’,
as the case maybe.
2
2,138,770
In the forms shown in Figs. 3 and'4, separate
packing at the screw threads may be dispensed
with, as in the form shown in Fig. 1.
Fig. 5 shows two joints wherein the‘ tubular
Cl members of smaller diameter are constituted by
lengths of pipe A and B having ?ange members
b’, b’ screwed into their adjacent ends, whereon
packing members c embedded in grooved metal
rings c’ are seated.
10
The intermediate larger
tubular member serving to complete said two
joints is constituted by a sleeve comprising two
co-operating, threaded rings d, e, which are pro
Evidently the invention may include variations
other than those herein described and illus
trated, without exceeding the scope of the ap
pended claim.
Flexible conduits according to the invention
are distinguished by great simplicity and ease of
manufacture in comparison, for example, with
the known ?exible pipes of the kind utilizing
ball joints, which require precision work, as, for
instance, grinding, in their manufacture.
10
I claim:
.
A ?exible conduit comprising a plurality of
vided with integral ?anges radially overlapping , tubular members jointed together, each joint con
the ?ange members b’ of the lengths of vpipe
A, B, so that the packing of each Joint is dis
posed in the annulus de?ned by the ?anged ring
d or e, and the end portion of the length of pipe
sisting oi.’ a larger end portion of one member
overlapping a smaller end portion of an adja 15
cent member, radially overlapping ?ange mem
bers on said end portions, the ?ange member
on each end member being spaced from the oppo
A or B with its ?ange member b’. To gain ac
cess to the packings, the two parts of the sleeve site end member to accommodate limited rela
are separated and the ?ange members b’ are un ' tive movement of the tubular members, a circum
screwed, whereupon the. packings may be re
newed. Upon assembly in the reverse order the
conduit is again ready for use. In this cas'e‘an
auxiliary packing member I is required at the
point where the sleeve parts d and e are screwed
together, in order that the conduit may be ade
quately sealed against the issue of the medium
?owing therein.
ferential packing interposed between said end
portions and con?ned between said ?ange mem
bers, the ?ange member on the larger end por
tion being detachable to facilitate renewal of
the packing and said packing being freely mov
able bodily between said end portions and be;
tween said ?ange members.
EMIL WITZENMANN.
20
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