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Патент USA US3021881

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Feb. 20, 1962
Filed May 14, 1958
United States Patent 0 ” IC€
Patented Feb. 20, l§62
Frank J. Rodgers, 545 Boulevard, West?eld, NJ.
Filed May 14, 1958, Ser. No. 735,268
3 Claims. (Cl.'138—118)
Speci?c Gravity ______________ __ _
Speci?c Volume, cu. in./
Refraction Index, my-“
Tensile Strength, p.s.i___
_ _
Elongation, Percent ___________________ __
The present invention relates to a ?exible thermo
plastic coiled tube- especially adapted to transmit ?uids
under high pressure to- pneumatic equipment. More par 10
ticularly, the present invention relates to an extruded
thermoplastic tubing which‘ has been given a treating
operation adapted to impart to it ?exible properties
whereby a ?exible coil is formed to which form it reverts
Modulus of Elasticity in Ten
Compressive Strength
Flexural Strength, p.s.i____
Impact Strength Izod 'l‘est
25. 5-22. 2
1. 53
7,,000-20, 000
D638, D651
6: 5-320
1. 5—4. 0X10 5
6, 700-13, 000
_ 3;500—13,800~ ~
Hardness Rool<rwell____7 _________________ __
Turning now to the drawing, there is shown the coil
indicated generally by the numeral 10, comprising-a plu
rality of helixes or loops 12 of substantially equal diam
after a. displacingforce has beenremoved.
15 eters terminating in standard pipe ?ttings 16.
At present, in machine shops and other establishments
The method of preparing the coil is advantageously as
where portable. equipment employing or actuated by
The extruded hose or tube, which is preferably
?uids under high pressure is used, the ?uid, i.e. com
made of nylon, and which may have an outside diameter
pressed air, is normally transmitted through rubber hose
of from 1A5 inch to 1 inch, and a wall thickness of .010
of wall thickness adequate to withstand the pressures
to .400 inch, is ?rst wrapped upon a mandrel of size
employed. Thus, pneumatic drills, compressed air hoses
su?icient to determine the desired diameter. It is pre
for blowing away metallic chips from drilling operations
ferred to wind the tube about the mandrel at room or
and the like, normally have air supplied through rubber
ambient temperatures. It is one of the peculiarities of
hose. This provides su?icient ?exibility and strength
to the operation but it su?’ers from the disadvantage that 25 the preferred composition of the present invention that
heating the tube prior to forming the coil on the mandrel
rubber tubing will not recoil. This makes it particularly
cumbersome to transport the tool from one location to
another, inasmuch as the heavy linesmay become tangled
or be in the way when the tool is not in use. This usu
tends to cause the tubular cross-section to assume an
oval rather than a circular con?guration.
Cold form
ing, however, insures maintenance of the original cir
ally requires additional devices and equipment such as 30 cular structure. The plastic stock material is wound into
the coil-shape form on a mandrel'of such size that the
reels or counterbalances to overcome the inconvenience.
inside diameter of the coil is determined by the diam
This extra equipment is not only expensive but also may
eter of the mandrel and the tension of the coil resilience
not give consistent satisfaction in operation.
regulated by the size of this inside diameter and
On the other hand, various devices have been pro
the proximity of the adjacent loops.
vided for enabling tubing to maintain a coiled form. 35
After the mandrel has been fully wrapped, steam is
These are generally undesirable, particularly when ap
through the inside of the hose. The heated tub
plied to the exterior of hose, as they are objectionable
ing thus conforms closely to the shape of the mandrel.
and frequently break through continuous use of the
Cold water is thereupon passed through the coil, simul
It is therefore the principal object of the present in 40 taneously cooling and hardening the latter and substan
tially returning it to its original conditions. The coiled
vention to provide a novel coiled hose adapted to trans
shape thus imparted to the tubing will be retained as long
mit ?uids under high pressure to pneumatic tools. It
as the material is not subjected to softening temperatures.
is a still further object of the present invention to provide
pressure or stretching of the hose will hereafter not
a coiled hose of this nature which has outstanding ability
to withstand internal pressure and external abrasion. It 45 permanently distort the coiled shape, In all probability,
the recoil effect is provided by the inherent properties of
is a still further object of the present invention to provide
the nylon plastic to return to its original shape or form
a coiled hose of the nature described which has the
once the deforming stress has been removed. This
property of recoiling to its original shape or form even
“elastic memory” is intimately related to the ?exural
though subjected to tension along the axis of the coil. 50 strength and modulus of elasticity of the material.
Other features and advantages of the invention will be
The ends of the coil are provided with standard tube
seen from the following description taken in connec
?ttings, and may otherwise be machined in any desired
tion with the drawing.
manner. In a typical operation employing the ?exible
FIGURE 1 is a view of the coiled hose at rest.
coil of the present invention, one end is connected to the
FIGURE 2 is an elevational View showing the coiled 55 source or outlet of the high pressure ?uid stream, as
hose under tension joined through a standard pipe thread
fitting 16 in FIGURE 2. The other end is connected
?tting to a pneumatic socket wrench.
with pneumatic tool 18 and, because of ‘its form, it is
evident that portable tool 18 may be transferred and
A plastic that is suitable ‘for the service above desig
moved to any position without snarling or snagging the
nated must be stiff, strong, tough, light, abrasive-re
sistant, have a low coe?icient of friction, and be both 60 coil. On completion of its use, the tool may be re
turned to its original stand, coil 12 concomitantly resum
chemically and thermally resistant. The synthetic plastic
ing its rest position.
that is presently available most suited for this service is
Though the coiled hose of the present invention has
nylon. This is a member of a family of synthetic resins
been described as being made, in one of its modi?cations,
formed by condensation of dibasic acids such as tere
from nylon tubing, it is understood that other thermo
phthalic acids, with diamines to form linear chains con
compositions have the necessary stiff or semi—
taining amide linkages. The inherent properties of
this synthetic in terms of strength, toughness, ability to
rigid properties, as well as’ the characteristics hitherto
cited, as well as sut?cient “elastic memory,” may be em
withstand high temperature and pressures make it out
ployed as well. Other existing plastics, however, such
standing for this use. In general, the physical proper 70 as polyvinyl chloride, polyethylene, polystyrene, and
ties of a thermoplastic composition suitable for use in
the like, are presently unsatisfactory. Vinyl and poly
accordance with the present invention are as follows:
styrene, which are quite pliable, do not have sufficient
?exural strength to Withstand the recoil eifect required
for an air hose. None of the three plastics mentioned
have su?icient tensile strength to withstand the neces
sary high operating pressures of a hose using a practical
wall thickness. The distortion temperature range of
these three plastics is not high enough to make them prac
tical materials.
and in the form of a series of normally contacting, com
pact, adjacent, convolutions and a wall thickness suf
?cient to adapt it to withstand high internal pressures
and to provide self-restoring ability.
What is claimed is:
l. A recoilable thermoplastic ?exible hollow coiled
tube adapted to transmit ?uids under high pressure com
prising a seamless resilient nylon tube having a substan
tially circular cross-section and in the form of a series
of normally contacting, compact, adjacent convolutions
and a wall-thickness su?ficient to adapt it to ‘withstand
high'internal pressures and to provide self~restor~ing
2. The 'coil of claim 1 wherein said coil has a wall
thickness of from .01 inch to .40 inch.
!?>. In combination with a ?uid operated mechanism,
a ?exible hollow- coiled tube adapted to transmit ?uids
under high pressure comprising a seamless resilient
nylon tube having a substantially circular cross-section
stiffness to give the necessary resilience to the coiled
shape. Styrene does not have sufficient elasticity and
References Cited in the ?le of this patent
Jowett ____________ __ Nov. 17, 1931
Ross et al. ____________ __ July 8, 1941
Cox ________________ __ Jan. 18, 1944
>Geraty ____________ __ Feb. 12,
‘Miller ____________ __ Sept. 30,
Eickmeyer et a1 _______ _.. Nov. 25,
Davis et a1. __________ __ July 14,
Roberts et a1. ________ .._. Feb. 5,
Smith et al ___________ __ Sept. 22,
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