U.S. patent number 3,760,514 [Application Number 05/197,037] was granted by the patent office on 1973-09-25 for rivet spike for a shoe.
This patent grant is currently assigned to Wolverine World Wide, Inc.. Invention is credited to Robert B. Egtvedt.
United States Patent |
3,760,514 |
Egtvedt |
September 25, 1973 |
RIVET SPIKE FOR A SHOE
Abstract
A shoe sole spike having a frustrum-shaped steel rivet with a
flared bottom and a shank extending from the flared bottom The end
of the steel shank includes a tungsten carbide insert. The sole of
a shoe is injection molded around an array of these spikes. The
bottom of the rivet spike is firmly seated in the sole material
with the tungsten carbide insert extending outwardly to provide a
highly wear-resistant spiked shoe sole suitable for use, for
example, on golf shoes. The sole can be integrally molded with a
heel, the rivet spikes being in both areas.
Inventors: |
Egtvedt; Robert B. (Comstock
Park, MI) |
Assignee: |
Wolverine World Wide, Inc.
(Rockford, MI)
|
Family
ID: |
22727756 |
Appl.
No.: |
05/197,037 |
Filed: |
November 9, 1971 |
Current U.S.
Class: |
36/67R |
Current CPC
Class: |
A43C
15/167 (20130101) |
Current International
Class: |
A43C
15/16 (20060101); A43C 15/00 (20060101); A43c
015/00 () |
Field of
Search: |
;36/59R,67R,67A,67D |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lawson; Patrick D.
Claims
The embodiments of the invention in which an exclusive property or
privilege is claimed are defined as follows:
1. A shoe sole spike including a rod insert, said spike comprising
a generally frustum-shaped steel body having a flared bottom which
is curved inwardly in a continuous manner to form a shank extending
therefrom, said shank having a vertically extending cylindrical
side wall and an aperture in one end for receiving said insert,
said cylindrical side wall being deformed toward said insert to
secure said insert within said aperture.
2. The spike as defined in claim 1 wherein said insert comprises a
tungsten carbide rod.
3. The spike as defined in claim 1 wherein said flared bottom has a
bottom surface including at least one dimple formed therein.
4. The spike as defined in claim 1 wherein said flared bottom
further includes a vertically extending side wall extending around
the periphery of said bottom.
5. A polymeric shoe sole comprising polymeric material having at
least one rivet spike therein, said spike comprising a generally
frustum-shaped metal body having a flared bottom held within said
molded polymeric material, said bottom of said spike including a
bottom surface having at least one dimple formed therein, and a
vertical side wall extending around the periphery of said bottom,
said flared bottom being curved inwardly in a continuous manner to
form a shank extending therefrom which shank further extends from
said sole, said shank including an aperture in one end and a
tungsten carbide insert rod securely mounted within said aperture
of said spike and having an end extending from said shank.
6. The sole as defined in claim 5 wherein said spike is
manufactured of steel and said tungsten carbide insert is
rod-shaped and swage mounted in said aperture.
7. A polyvinyl chloride shoe bottom comprising a sole portion and a
heel portion in which a plurality of rivet spikes are mounted by
molding said polyvinyl chloride around an array of said spikes,
each of said spikes comprising a tungsten carbide insert, a
generally frustum-shaped metal body having a flared bottom which is
curved inwardly in a continuous manner to form a shank extending
therefrom, said shank including an aperture in one end for
receiving said tungsten carbide insert and a vertically extending
cylindrical side wall which is deflected inwardly toward said
insert to secure said insert within said aperture said insert
including an end extending from said shank.
Description
BACKGROUND OF THE INVENTION
The present invention relates to shoe spikes, and particularly, to
steel rivet-type spikes adapted to be molded into shoe sole
material and wherein each spike includes a tungsten carbide
insert.
For many years, spiked shoes such as golf shoes have used spikes
which were threadably or otherwise removably mounted to plates
imbedded in the soles of the shoes such that, as the spikes become
worn during use, they could be replaced. Although this type of
spike provides adequate traction, the spikes require frequent
tightening to prevent their loss by becoming loosened and falling
off during use. Thus, such an arrangement is somewhat of a nuisance
to the wearer, who has to carry a special wrench for tightening the
spikes, and extra spikes to replace the ones lost.
Recently, golf shoes have been provided with permanent spikes which
are rigidly affixed to a mounting plate which in turn is molded
within the shoe sole. U. S. Pat. Nos. 3,492,744, L. E. Bernier, et
al., issued Feb. 3, 1970, and U.S. Pat. No. 3,537,193, L. E.
Bernier, et al., issued Nov. 3, 1970, each describe such a method
for mounting permanent types of spikes including tungsten carbide
inserts to a shoe sole. The spikes therein described, however,
require the use of a mounting plate to which they can be attached.
Such an arrangement, therefore, becomes relatively costly, both as
to the materials employed, since a mounting plate is required, as
well as to manufacturing costs since additional manufacturing steps
are necessary to attach the spikes to the plate. Thus, althhough
the problem of losing spikes has been solved by such apparatus, the
cost of such permanent spikes which require a mounting plate
remains relatively high.
Conical-shaped solid ceramic spikes have been directly mounted
within elastomeric sole material, but such spikes are relatively
expensive and have not provided as much wear-resistance as often
desired. If they become quite worn, they, of course, are not
replaceable.
SUMMARY OF THE INVENTION
The rivet spikes of the present invention are shaped such that they
can be securely molded directly within the sole material without
the requirement of a mounting plate. Additionally they are
manufactured of steel and include a tungsten carbide insert for
wear resistance. Rivet spikes embodying the present invention
comprise a frustum-shaped rivet having a relatively wide flared
bottom portion and a shank extending from the flared bottom. The
shank has an aperture therein in which a tungsten carbide insert is
fitted and swaged to permanently hold the tungsten carbide insert
within the rivet. The bottom surface of the flared bottom of the
rivet has a dimple formed therein to aid in securely holding the
rivet in place within the sole material.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of a shoe bottom which includes an array of
rivet spikes embodying the present invention in the sole and heel
areas;
FIG. 2 is a side elevational view of the shoe bottom with the rivet
spikes mounted therein;
FIG. 3 is an enlarged perspective view of a rivet spike embodying
the present invention;
FIG. 4 is an enlarged side elevational view of the rivet spike of
the present invention;
FIG. 5 is an enlarged view of the bottom of the rivet spike shown
in FIG. 4;
FIG. 6 is an enlarged plan view of the rivet spike shown in FIG. 4;
and
FIG. 7 is an enlarged sectional view of the rivet spike shown in
FIG. 4 and shows the tungsten carbide insert mounted within the
shank of the spike.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the figures, the bottom of the shoe includes a sole
portion 10 and a heel portion 20 which can be a unitary structure
molded from any suitable polymeric material 15 generally used in
the manufacture of shoe soles. In one embodiment, polyvinyl
chloride is employed. Other typical polymers include
styrene-butadiene rubber (SBR), polyurethane, and other suitable,
well-known materials. Within the sole and heel portions, are
imbedded a plurality of rivet-type spikes 30. The spikes are of the
shape shown in FIGS. 3 through 7 and are held in a suitable array
or pattern by the molding machine such that the polymeric material
can be injection molded around the spikes in the sole and heel
areas 10 and 20. The spikes 30 are manufactured from steel to which
any standard commercially available bonding agent can be applied if
necessary prior to the molding step to ensure proper bonding
between the particular polymeric material selected and the surface
of the spikes.
The spikes 30 comprise a generally frustum-shaped body having a
flared bottom 32 which is curved inwardly in a continuous manner to
form a shank 35 which extends from said bottom. The bottom 32 is
imbedded in the polymeric material to securely hold the rivet spike
in position. To aid in stabilizing the rivet spike in place, the
bottom 32 has a vertical side wall 33 extending around its
periphery. The bottom surface 31 of bottom 32 also includes at
least one dimple 34 shown in FIGS. 5 and 7 into which the polymeric
material protrudes to further stabilize the spike by providing
additional side surface areas which resist lateral forces against
the side of the spike. In other embodiments, the bottom surface may
include a plurality of generally dimple-shaped indentations for
this purpose.
The upward projecting shank 35 of the spike has a flat shoulder or
end 36 with an aperture 37 drilled therein along the longitudinal
axis of the spike. Aperture 37 is adapted to receive a rod-shaped
tungsten carbide insert 40 which is securely fitted into the
aperture 37 by first placing the insert 40 within the aperture, and
then swaging the upper portion of the shank indicated as the area
38 in FIG. 7. By so swaging the material, the tungsten carbide
insert 40 is securely held in position and will not work loose
during the use of the spikes.
As seen in FIG. 2, the shank 35 and the carbide tip 42 extend
outwardly from the bottom of the polymeric material 15. The shoe
sole and heel so formed can thereby by cemented or otherwise
attached to a shoe upper to provide, for example, a golf shoe with
the improved permanent spike therein.
The tungsten carbide insert 40 is somewhat longer than the aperture
37 and has an end 42 which therefore extends from shoulder 36. Such
an arrangement reduces wear on the steel shoulder 36 of the spike
during use since the more durable tip 42 will contact the ground
surface. When used in golf shoes where the wearer frequently walks
over hardened surfaces such as concrete, this feature greatly
extends the life of the spike.
* * * * *