Grinding apparatus with flexible plate

Details Grinding apparatus with flexible plate Grinding apparatus with flexible plate

1999-11-17

2001-03-06

Sewell, Paul T. (Department: 3728)

Boots, shoes, and leggings

Boots and shoes

Occupational or athletic shoe

C036S132000, C036S114000, C036S107000, C036S07200R, C036S149000, C036S136000, C036S07500A

Reexamination Certificate

active

06195918

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to grinding shoe devices employed by athletes to grind along rails, curbs or the like.
2. Description of the Prior Art
With the current popularity of grinding activities involving athletic shoes with grinding plates mounted on the bottom side thereof, many efforts have been made to provide a satisfactory grinding shoe. In an earlier patent application owned by the same Applicant, Ser. No. 08/799,062, filed Feb. 10, 1997, and now U.S. Pat. No. 5,970,631, issued Oct. 26, 1999 we proposed grind shoe devices including various configurations involving grind plate sections mounted under the arch and grind plate sections extending longitudinally of the shoe sole. In our co-pending U.S. application Ser. No. 09/333,612, filed on Jun. 15, 1999, we address the basic configuration of a cruciform grinding plate mounted on a shoe for providing the athlete with foot positions in both the direction of travel and perpendicular to the direction of travel. Such grind shoe devices have provided solutions to many of the problems associated with the desire for a satisfactory grind shoe. It has been discovered that the performance of grinding shoes may be enhanced by the provision of uniquely configured, longitudinally extending grind plate sections which are formed along their length with independently flexible sections or sometimes with discrete separate portions so that longitudinal flexing is facilitated during walking and running maneuvers and even during some grinding activities. It is these features as illustrated herein for exemplary purposes in
FIGS. 17-20
, and
28
-
52
to which the present invention is directed.
Further advantages of the grinding device of the present invention is that the longitudinal grind plate section is placed under the sole of the shoe in advantageous positions and orientations for various unique grinding activities. These advantages will be apparent to those skilled in the art from the following detailed description of the invention.
SUMMARY OF THE INVENTION
The present invention is characterized by a grinding shoe device formed with a shoe sole having downwardly opening longitudinal recesses configured for receipt of longitudinal grind plate sections which are flexible in the longitudinal direction to facilitate the walking and grinding maneuver. Such flexibility may be achieved by hinge elements formed at various locations along the length of the grind plate device or may even be formed by configuring the longitudinal grind plate with discrete portions defining therebetween transverse flex lines for the sole itself. The sole may be formed with transverse hinge lines aligned with the juncture of the various discrete plate portions.


REFERENCES:
patent: 702476 (1902-06-01), Price
patent: 875560 (1907-12-01), Vaughan
patent: 892152 (1908-06-01), Harman
patent: 2484935 (1949-10-01), De Rooy
patent: 5410821 (1995-05-01), Hilgendorf
patent: 5970631 (1999-10-01), Inman
patent: 6006450 (1999-12-01), Hayes
patent: 6006451 (1999-12-01), Morris et al.
patent: 6041525 (2000-03-01), Kelley
patent: 6115946 (2000-09-01), Morris et al.

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