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Патент USA US2120363

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June 14, 1938.
Filed May 6, 1937
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June 14, 1938.
Filed May 6; 1957
57 I5z/-15
2 Sheets-Sheet 2
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Patented June 14, 1938
Nicholas J. Jerns, Jr., Bellingham, Wash.
Application May 6,1937, Serial No. 141,159
3 Claims.
(Cl. 280—11.13)
My present invention relates to the art of
skiing equipment and more particularly to a
traction device for skis.
Until very recently skiing has been largely a
5 matter of transportation in those countries where
snow is abundant for many months of the year.
Now, however, it has become a sport which is
indulged in by a great number of people. In the
past, ski equipment was produced principally by
10 hand work of skilled artisans and the traction
devices provided were of the type, usually care
fully hand made, to be slipped on over the skis at
the time they were used. They were in the nature
of a bandage, or a bag, having roughened sur
15 faces or cleets positioned on the bottom of the
Other devices have been produced using
metal members standing out from the sides of the
skis and extending downwardly to engage the
ski with my device in the position it assumes
when being used as a traction device.
Figure 5 is a longitudinal sectional view, in
elevation, substantially along the center line of
the ski but showing the traction device removed. 5
Figure 6 is a perspective view of a modi?ed
form of my traction device, having an extra bend
which adapts it more particularly to hillside Work
in that it provides against side-slippage as well as
slipping forward or backward.
Figure '7 is a perspective view of a ski with one
of my devices shown attached in its traction posi
Figure 8 is a perspective View of the locking
mechanism which holds a modi?ed form of my
traction device in place.
Figure 9 is a perspective view showing a slightly
modi?ed form of traction device in which the
snow. Those observed were characterized by
device is made with a square shank member ine
20 requiring considerable time to put on or take off stead of being stamped entirely from a ?at plate. 20
and, further, where metal or wooden members
Figures 10, 11, and 12 show various stages in
were used, they extended permanently out from the operation of a modi?ed form of my device,
the side of the ski so that when the ski was being Figure 10 being a vertical cross-section, Figure 11
used in the normally intended manner there was
a top plan View, and Figure 12 a longitudinal sec- ’
25 always a drag that interfered with the free run
’ tion taken along the major axis of the ski.
ning of the ski.
Figures 13, 14, and 15, illustrate a further modi
My device is to overcome these de?ciencies and ?ed form of my traction device, showing the se
to provide a traction device that can be made quence of steps in the operation thereof.
and which when not being used for traction pur
poses, will lie wholly within the upper margin of
Referring to the drawings, throughout which
like reference characters indicate like parts,‘ It 30
designates the base plate of my device. This
member forms the supporting framework of the
the ski runner so that it will in no way interfere
under quantity production methods that will be
20 simple, foolproof, will provide positive traction,
with the proper functioning of the ski.
My present structure as shown in the accom
panying drawings lends itself particularly to pro
duction by metal stampings. This has a two-fold
advantage in that the devices may be produced
very economically and secondly that they will be
light and tough, both of which are very desir
able characteristics in this type of equipment.
Other and more speci?c objects will be ap
parent from the following description taken in
connection with the accompanying drawings,
Figure 1 is a top plan view of a ski with my
device attached thereto showing the same in its
normal position of use.
Figure 2 is a top plan view similar in part to
50 Figure 1 but with the traction device in its stowed
position as it is normally carried when not in
Figure 3 is a cross-sectional view taken along
the line 3-3 of Figure 1.
Figure 4 is a side elevation of a portion of a
that locks and secures my traction
device to the ski. It is preferably screw fas
tened to the ski as by screws I8 and may be 35
placed at any convenient place on the ski.
At present the preferred arrangement seems to
be to place it ahead of the foot rest portion.
In the forms shown in Figures 1 to 5, inclu
sive, the base plate I6 is preferably provided
with an upstanding portion 2% which is bent
back upon itself to provide, in effect, a slot
which will hold the traction device proper 22
in a substantially vertical position. For most
purposes it seems best to incline the same slightly
as shown in Figure 4. Traction plate 22 is held
in the desired position by means of an eccen
trically mounted cam locking lever 24 which is
pivotally supported as at 26 from lugs formed
from, or secured to, plate It. The construction
of this member is probably best illustrated in
Figures 4 and 5 where it is shown respectively
in the locked and in the released position. Below
pivot 26 plate 16 is deformed as at 28 so as to
provide, in effect, a second or horizontal slot so 55
that the traction plate 22 may be inserted in the
slot 29 thus formed, and when so placed will lie
?at on top of the ski where it is entirely out of
wherein the dotted line position shown in Figure
the way and will in no manner interfere with
pulled to the left as viewed until stop 54 abuts a
coacting stop‘ portion 55 formed as part of guide
member 20, then after the showing of Figure 12
it may be revolved up to the horizontal position
where it then functions as the form shown in
Figures 1 to 5.
the most satisfactory operation of the ski being
used in the normal manner. When plate 22 is in
serted in slot 29 it will be observed from a study
of Figure 4 that lever 24 has the downwardly ex
tending cam portion 30 which will engage plate
10 22 in its horizontal position and lock it securely
against movement.
Traction plate 22 in its simplest form is prob
ably best illustrated in Figures 2 and 3 and con
sists of a substantially U-shaped plate having the
positioning bar portion 32, the traction bar
proper 34, and the connecting portion 36.
There are certain conditions under which it
may be desirable to modify plate 32, to make it
more adaptable for certain speci?c purposes.
For instance, in Figure 6 I have illustrated a
form in which in addition to the structure shown,
Figures 2 and 3, I have added a fourth portion,
38-, which would normally be disposed parallel to
the longitudinal axis of the ski. This, it is be—
lieved, will be understood will give full assurance
that there will be no side slipping of the ski when
side hills are being negotiated. Further, to add
rigidity it may in certain instances be desirable
to form strengthening ribs as 40- which, pref
30, erably, should run the length’ of the plate.
In Figures 8 and 9 I have illustrated a modi
?ed form of my traction plate in that the plate
proper as 42 is secured to, preferably, a square
shank 44 although any regular polygon section
351 could be used. When this form is employed slot
46 would, of course, be the same shape as the
cross-section of shank 44 and it could be placed
in the vertical position or horizontal position,
or if instead of being square, a hexagonal or octag—
40? onal form were used, adjusted positions might
be employed. Any of these, however, would re
quire that looking lever 48 need only have one
cam face as it would always operate in the same
manner, whether the traction device was in a
vertical, horizontal, or other adjusted position.
In Figures 10, 11, and- 12, I have illustrated a
modi?ed form of construction in which traction
plate 50 is cut out as at 52 and provided at the
extreme end of leg 32 with a stop member 54'.
The sequence of operation is probably most easily
understood by a study of Figures 10-, 11, and 12,
10 is the normal position of use. To retract the
device, and put it on top of the ski, plate 50 is
In Figures 13, 14, and 15 I have illustrated a 10
further modi?ed form in which traction plate
51 is provided with a pivot pin 58. This pivot
pin in turn operates within a slot as 60 formed
in the upright guide members 6! and 62. Figure
131 illustrates how this member would be carried.
It would have.v the objection of being disposed
well above the surface of the s11‘ but for certain
uses that may not be a serious objection, then
when it is desired to use the same it is hinged
down about pin 58 after the showing of Figure
14 until bar 32 is substantially horizontal then
the whole plate assembly 51 is moved to the
right as viewed until the ?nal position of rest as
illustrated in I5 is obtained. Lever 48 is moved
to the locking position and the device» is then 25
ready for use.
The foregoing description and the accompany
ing drawings are believed to clearly disclose a
preferred embodiment of my invention but it will
be understood that this disclosure is merely illus 30
trative and that such changes in the invention
may be made as are fairly within the scope and
spirit of the following claims.
I claim:
1. The combination with a ski, of a base plate
on said ski formed with a vertical and a horizon
tal slot, and a detachable traction arm adapted
to alternately engage one of said slots.
2. The combination with a ski, of a base plate
on said ski formed with a vertical and a horizon
tal slot, and a detachable traction arm adapted
to alternately engage one of said slots, and means
for retaining said arm in the selected slot.
3. The combination with a ski, of a base plate
on said ski formed with a vertical and a horizon
tal slot, a detachable traction arm adapted to
alternately engage one of said slots, a cam and
operating means therefor on said base plate
adapted to frictionally engage and retain said
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