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Патент USA US2135651

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Nov. 8, 1938.
H. w. WEBB
2,135,651
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‘v 2,135,651
Patented Nov. 8, 1938
_ = UNITED STATES
PATENT OFFICE‘
2.135.051
METHOD ‘OF MAKING FLEXIBLE TUBING
Hartwell w. Webb, Flint, Mich, asaignor to Gen
eral Motors Corporation, Detroit, Micln, a cor
poration of Delaware
Application September 11, 1936, Serial No. 100,296
20mm. (CL 113-35)
This invention‘ relates to the method of mak
ing ?exible tubing or casing used to house the
?exible shaft used to drive the speedometer in
automotive vehicles. ' The tubing is, however,
1 Figure 5 is a view of the rolls for forming the
wire to the shape shown in Figures 3 and 4. .
Figure 6 is a view of the ?nished casing.
On the drawing the numeral 2v indicates a
?exible tubing or casing. The tubing is com
posed of two coiled or intertwined elements 4
and 8. 'The element 4 is relatively ?at and has
an inside ?at surface 8 ‘and an outer arcuate or
6 capable of use in many other relations.
In the prior art it is known to form a casing
or ?exible tubing -of two spirally intertwined
members one of which is relatively ?at and broad
and the other relatively narrow and of triangular ' curved surface ID. The element 6 is in general
0 shape. It has been found that where a ?exible ' form triangular, but has its side faces rounded
tubing is made with the small triangular member inwardly or in arcuate form as shown at I2.
top or outer face I4 is also arcuate and
spirally wound between the convolutions of the Its
rounded inwardly as best shown in Figure 3. The
relatively broad member the tubing will have a curvature of the side face l2 conforms to the
1 tendency to "crack” or "break" when given too curvature of the side of the elements “I as 15
small a bending radius. This cracking or break
indicated at it.
v
ing is objectionable in that the tube could not be
Referring-to Figures 1, 4, and 5, the pairs of
easily restored to its original shape. In inves
rollers l5 and l1, l8 and 20 for forming the
tigating the cause of this cracking or breaking triangular element 6 are shown. The upper roller
I5 is cylindrical while the lower roller l1 has'a 20'
20 it was found that if the relatively narrow tri
angular element of the casing was made with V-groove I! to give a preliminary V-shape to
dished arcuate sides and the shape of the sides the round wire 2!. The second upper roller
I! has the annular ribs 22 and 24, while the
of the are made to conform with the rounded
shape of the relatively broad member, a better lower roller “has the mating or registering
casing could be made by bending or ?attening ‘annular grooves '26 and 28. The groove 26 con
the edge of the triangular member where it forms to the rib 22 while the groove 28 con
contacts with the broader element of the casing. forms to the rib 24. ‘ A section through the rib 22
This ?attening or bending is caused by the rolls in groove 26 is shown in Figure 4. A circular
in. winding the wire to circular form when the wire is used and is ?rst passed between the rolls 30
casing is made. The triangular member before l5 and I‘! to cause the roller l5 and’ groove
l9 to give it a triangular shape at 6' in Figure 1.
it is formed into the casing has its outer side
This
triangular wire is then passed through the
curved or inwardly dished, but in the finished
form of the cable the outer face is substantially rolls l3 and 20 between the rib 22 and groove 26
?at or straight for the reason that the edges of ‘to give it the ?nished shape as shown at 6
' the element (adjacent the broad element of the in Figures 1 and 3. This shape is used for larger
tubing) have been curled down ‘or bent toward diameter casing.
The form of the rib 24 and groove 28 are di
the casing. This curling ‘down or bending of the
arcuate edge gives a closer contact between the mensionally different but give a ?nished product
of a shape similar to that of Figure 3. The
adjacent elements of the casing and also pre
change in shape is to adapt the wire to small 40
40 vents the cracking or breaking of the cable when
diameter casings.
given a relatively short radius of curvature.
0n the drawing
Figure 1 is a view of the wire passing through
the pairs of forming rolls.
45
Figure 2 is an enlarged sectional detailed view
through the completed casing.
Figure 3 shows in section the finished wire
rolled into triangular form for a large diameter
'
By referring to Figures 3 and 4 it will be noted
that the upper inwardly dished curved surface
l4 has the outer upwardly projecting edges 30
and 32. When the element 6 is placed in the 45
machine to form the ?exible casing 2 to the
form shown in Figure 6 the rollers of the ma
chine will ?atten or curl down the upwardly pro
jecting edges 30 and 32 and spread them laterally
into triangular form with arcuate sides for a
over the surface Ill and cause the element 6 to be
substantially ?at at its outer surface as shown
at 30' and 32' in Figure 2. This ?attening or
curling down of the edges 30 and 32 which takes
large diameter casing, the section being taken
55 through the rolls at the left of Figure l.
place during the forming operation will press the
contacting sides at l6. closer together and give
50
casing.
I
,
Figure 4 shows in section the manner of roll
ing a trangular wire from the first pair of rolls
2
to the element 6 and the ?exible casing in gen
a ?rmer contact between the two spirals and
eral a permanent set so that it will not uncurl to give a permanent set to the elements of the
at the ends and so that there is a much less tend \ tubing and to prevent unraveling.
ency to break or crack when the casing is given
a sharp arcuate curve.
I claim:
.
1. The method of making ?exible tubing con
sisting of spirally intertwining arelatively ?at
element having an arcuate surface and a sub
10 stantially triangular element having arcuate
dished sides and an arcuate dished top, the
intertwining of said elements into tubular form
causing the two arcuate sides of the triangular
member to contact with the adjacent arcuate
15 sides oi’ the relatively ?at member and ?attening
or rolling down of the edges 01' the outer or top
arcuate side of the triangular member to cause
2. The method of making ?exible tubing con
sisting of spirally intertwining a relatively ?at
element having sloping edge surfaces and a sub
stantially triangular element having sloping sides
and a dished top, the intertwining 0! said ele
ments into tubular form causing the two sloping
sides of the triangular member to contact with
the adjacent sloping sides oi’ the relatively ?at
member and ?attening or rolling down or the
edges of the dished top of the triangular mem
ber to cause a ?rmer contact between the two
spirals and to give a permanent set to the ele
ments of the tubing to prevent unraveling.
HARTWEIL W. WEBB.
15
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