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Патент USA US3035836

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May 22, 1962
J. A. FREY ETAL
3,035,826
SPRING OF COILED FLAT
Filed Nov. 24. 1959
m2
TEE,‘
INVENTORS
JOHN A. FRE'Y and
JOHN A. HE/VR/C/(SON
5’
W
A llarney
United States Patent Ofr?ce
1
3,035,826
Patented May 22, 1962
2
ured with a planimeter. The area under the hysteresis loop
3,035,826
was measured (1) when a torque of 117 inch-pounds was
obtained on the curve, (2) when a twist of 300" was
John A. Frey, Grafton, and John A. Henrickson, Holden,
reached on the curve, and (3) when an initial energy of
Mass, assignors to United States Steel Corporation, a
5 328 inch-pounds was stored under the curve. These three
corporation of New Jersey
methods of comparison were used because the conven
Filed Nov. 24, 1959, Ser. No. 855,110
SPRING 0F COILED FLAT
1 Claim. (Cl. 267-1)
tional crowned spring did not develop the same torque for
the same twist as the ribbed spring.
This invention relates to improvements in springs of
The springs were then cycled 48 times and the same
coiled ?ats and the method of making the ?ats therefor. 10 energy loss per cycle was measured.
In springs formed of coiled ?ats such as are used in door
TABLE I
checks and the like, the e?‘iciency of the spring action is
limited by friction between the coils thereof. Such springs
Relative Energy Loss Per Cycle
have heretofore been formed with a crown to minimize
friction but this necessitated forming the strip in a single 15
MEASURED TO A TORQUE OF 117 INCH-LBS.
strand in order to roll a crown into the strip which adds
Before
considerably to the cost thereof.
Cycling,
inch-lbs.
'It is accordingly an object of this invention to provide
a method of making ?ats for coiled springs at a lower cost
47. 6
than was heretofore possible.
20 Rlbb
ed _____________________________________ ..
'
36. 7
Aiter
Cycling,
inch-lbs.
Conventional _______________________________ __
It is another object of this invention to provide a spring
of coiled ?at having a reduced frictional component.
The foregoing and further objects will ‘be apparent from
29. 3
28. 4
MEASURED TO A TWIST OF 300°
the following speci?cation when read in conjunction with
the attached drawing, wherein:
25
Ribbed _____________________________________ ._
invention;
MEASURED TO AN INITIALLSB'IéORED ENERGY OF 328 INCH
Conventional _______________________________ __
47. 5
34. 8
31. 0
28. 8
FIGURE 1 shows a length of spring ?at material of our
FIGURE 2 is a side view of a coiled spring formed
from the material of FIGURE 1; and
Conventional _______________________________ __
FIGURE 3 is a section on line Ill-III of FIGURE 2. 30 Rib
bed
48 . 5
31. 8
34. 0
29. 5
Referring more particularly to the drawing, the numer
a1 2 designates a length of strip suitable for forming into
The loss in energy per cycle for a standard crowned
?ats for coiled springs. Pursuant to the teachings of our
spring
was 14.8% and after cycling 9.9%, whereas the
invention, the strip is su?iciently wide to form a plurality
of ?ats F for coiling. Accordingly the strip can be e?i 35 ribbed spring of our invention lost 10.4% before cycling
and only slightly less, i.e., 9.0% after cycling.
-ciently rolled in any desired Width. After rolling the strip
While we have shown and described several speci?c
can be conveniently slit into suitable widths for spring
embodiments
of our invention, it will be ‘understood that
?ats. In accordance with the teachings of our invention,
these embodiments are merely vfor the purpose of illustra
the ?at is provided with a purality of ribs or ridges 4 on
ition and description and that various other forms may be
one side extending along the length thereof.
40 devised within the scope of our invention, as de?ned in
For most applications a minimum of 3 ridges should be
the appended claim.
provided on each spring ?at. The maximum number is
We claim:
not critical but should in general be equal to the width of
A coiled spring composed of a spring ?at having at
the ?at in inches divided by 2 times the ridge width in
least
three continuous longitudinally extending ribs on one
inches. Height of the ridges may vary from about .0015” 4.5
side
thereof, the outermost of said ridges being spaced
as a minimum to approximately 10% of the strip thick
inwardly from the edges of the ?at, the other side of said
ness. For example on .060" thick material, the height
?at being substantially ?at, the height of said ribs being
may vary from .0015" to .006”. The width of the ridge
between
.0015” and about 10% of the thickness of said
may vary ‘from a minimum .006" to a maximum of ap
proximately 10 times the ridge height.
Not only does the use of ribs or ridges on the ?ats
spring ?at, said ribs providing substantially line contact
50 with the ?at side of said spring ?at.
provided by our invention increase the e?iciency of coiled
springs formed therefrom but the marked decrease in
e?iciency after cycling requiring resetting of conventional
springs is almost completely eliminated. This unexpected 55
result is clearly shown by the following energy loss tests.
In these tests on conventional doorcheck springs and
ribbed springs of this invention, torque-twist curves were
autographically plotted in the windup and unwind direc
tion and the area of the hysteresis loop formed was meas
60
ReferencesrCited in the ?le of this patent
UNITED STATES PATENTS
817,378
Lane ________________ .. Apr. 10, 1906
858,625
831,017
864,177
217,224
France _______________ .._ May 13,
Germany ____________ __ Feb. 11,
Germany _____________ .._ Jan. 22,
Great Britain __________ __ June 4,
FOREIGN PATENTS
1940
1952
1953
1924
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