U.S. patent number 3,612,520 [Application Number 04/847,625] was granted by the patent office on 1971-10-12 for rockable exercising platform for skiers.
This patent grant is currently assigned to Life Systems Engineering. Invention is credited to Quong Y. Chang, John W. Stone.
United States Patent |
3,612,520 |
Chang , et al. |
October 12, 1971 |
ROCKABLE EXERCISING PLATFORM FOR SKIERS
Abstract
An exerciser for skiers in the form of a hollow bowl having a
platform on which the skier strands; the outer surface of the bowl
having a spherically shaped base portion and angularly related
essentially conical portions which permit the skier to select
angles at which the platform is tilted to predetermine the
intensity of the exercise; the bowl containing a fixed weight at
its base portion to lower its center of gravity and a vertically
adjustable weight to change the center of gravity.
Inventors: |
Chang; Quong Y. (Los Angeles,
CA), Stone; John W. (Beckley, WV) |
Assignee: |
Life Systems Engineering (Los
Angeles, CA)
|
Family
ID: |
25301085 |
Appl.
No.: |
04/847,625 |
Filed: |
August 5, 1969 |
Current U.S.
Class: |
482/71;
482/146 |
Current CPC
Class: |
A63B
21/0004 (20130101); A63B 22/18 (20130101); A63B
21/06 (20130101); A63B 2022/0033 (20130101) |
Current International
Class: |
A63B
22/00 (20060101); A63B 22/18 (20060101); A63B
21/06 (20060101); A63b 023/04 () |
Field of
Search: |
;272/33A,57A,57B,60 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Pinkham; Richard C.
Assistant Examiner: Dror; Richard
Claims
We claim:
1. An exerciser for skiers, comprising:
a. a base member having an apex of spherical contour and a series
of concentric angularly related conical surfaces of increasing
slope;
b. and a substantially flat platform covering the entire base
member to define the uppermost surface thereof and dimensioned to
receive substantially only the feet of the user whereby the user,
when standing on said platform, may rock the base member to a
selected conical surface to control the intensity of his exercise,
said apex of spherical contour being of a diameter that is a minor
portion of the diameter of said platform and centrally located
therebelow whereby to be between the feet of a user standing on
said platform.
2. An exerciser, as defined in claim 1, wherein:
a. said base member includes a fixed weight at its apex
portion.
3. An exerciser, as defined in claim 1, wherein:
a. said base member is hollow and includes a centrally located
weight and means for adjusting the position of the weight to move
the center of gravity.
4. An exerciser, as defined in claim 1 for skiers, comprising:
a. a hollow base member having an apex of spherical contour and a
series of concentric, angularly related surfaces defining conical
areas of increasing slope for presentation to an underlying floor,
said base member terminating in a rim;
b. a platform covering the base member and secured to said rim, the
platform having an aperture for access to said base member;
c. and vertically adjustable weight means in said base member
accessible for adjustment from the central portion of said
platform.
5. An exerciser for skiers, as defined in claim 4, wherein said
weight means includes:
a. a fixed weight secured in the apex region of the base
member;
b. a screwthreaded post projecting upwardly therefrom;
c. and an adjustable weight carried by said post.
Description
BACKGROUND OF THE INVENTION
The sport of skiing requires special development of muscles
particularly in the feet, ankles and legs. This was recently
indicated in an article appearing in the Nov. 1968 issue of "Skiing
Magazine." It is desirable, in fact imperative, that a skier
perform exercises to condition his muscles prior to the first ski
runs of the season, or greatly increase his chance of serious
injury. Few skiers have exposure to skiing conditions for the
period necessary to develop the muscles by gradually increasing
exercise on the ski slope; consequently, special apparatus is
required. Such apparatus has been developed; however, the more
successful apparatus has been expensive and confined to gymnasiums.
Attempts have been made to provide inexpensive portable exercising
devices for home use, but these have been deficient for the proper
progressive development of the muscles.
A type of toy has been developed, as exemplified in U.S. Pat. No.
3,024,021, which consists in a platform placed on a ball or portion
thereof so that one may stand on the platform and rock. Such
devices while suitable as a toy and a general purpose exerciser,
fails to accomplish the objectives of a skier's exerciser and
particularly does not provide for exercise of progressively
increased intensity.
SUMMARY OF THE INVENTION
The present invention is directed to an exerciser particularly
adapted for the muscular conditioning of skiers, and is summarized
in the following objects:
First, to provide a simple and inexpensive exerciser whereby a
skier may initiate his exercise at low intensity, then
progressively intensify the exercise as his muscles strengthen;
that is, the skier may control the intensity of his exercise to
correspond to the condition of his muscles.
Second, to provide an exerciser for skiers on which the skier may
simulate the various maneuvers he is required to perform when on
skis.
Third, to provide an exerciser for skiers which is in the form of a
bowl having a specially contoured outer surface defining angularly
related conical areas so that the device may be tilted to present a
selected area to the floor.
Fourth, to provide an exerciser for skiers as suggested in the
preceding object which contains a fixed weight and an adjustable
weight so that the center-of-gravity may be adjusted to the needs
of the user.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of the exerciser.
FIG. 2 is a side view thereof.
FIGS. 3, 4 and 5 are other side views thereof, showing the
exerciser in different angular positions.
FIG. 6 is an enlarged sectional view, taken through 6--6 of FIG.
1.
SPECIFICATION
The exerciser includes a base member 1, preferably formed of
plastic material and bowl-shaped in contour. Externally, the base
member 1 forms a spherical apex portion 2, the periphery of which
merges into a first conical area 3, which in turn, merges into a
second conical area 4 of greater slope, the areas forming
therebetween a narrow transition zone 5.
The outer periphery of the base member forming the second conical
area 4 is joined to an annular internal reinforcing rib 6, which in
turn, is joined to an upwardly directed marginal rim 7. A platform
8 also preferably formed of plastic material, and having an annular
groove, is received on the marginal rim 7 and secured thereto by
cement 9. The outer periphery of the second conical area, the
juncture between the internal rib 6 and the marginal rim 7, and the
lower peripheral corner of the platform 8, designated respectively
10, 11 and 12, define a third conical area.
Centrally located in the base member 1 is a fixed weight 13, which
may be secured thereto by a cement 14. The fixed weight 13 supports
a vertically extending stud bolt 15, which receives an adjustment
nut 16. The adjustment nut may be provided with friction producing
means 17 so as to prevent free rotation. Molded around, or
otherwise secured to the adjustment nut 16, is a disk-shaped
movable weight 18. The platform 8 is provided with a central
aperture 19 to expose the nut 16 for adjustment.
Cemented to the upper surface of the platform 8 is a sheet of
material 20, having a high friction surface which may include
suitable ridges and grooves. Alternatively, the surface of the
platform 8 may be finished to provide a high friction surface.
Operation of the exerciser is as follows:
The user stands on the platform 8 in such a manner as to balance
thereon, with the spherical apex portion 2 in engagement with an
underlying floor surface. By manipulation of his weight, the user
may tilt the base member to the first conical area 3. He will sense
the transition zone 5 if he causes the base member to move from the
first conical area 3 to the second conical area 4, as shown in FIG.
4, and can with a little practice, avoid movement to the second
conical area.
By appropriate manipulation, the user may simulate various
movements which are made when skiing. These include the following
movements or actions:
Anticipation: Series of movements used to initiate a
christie-up-unweighting, an increase of forward lean, banking and a
partial rotary (in the direction of the turn) motion of the hips,
shoulders, arms and outside ski pole.
Blocking: The shoulders are used to supply the turning force and
the muscles allowing the hips and legs to swivel around at the
ankles must be contracted (or blocked) at the right time so that
the torque generated by the shoulders is passed on to the feet and
skis.
Counter-Rotation: This occurs when the shoulders and hips rotate in
a direction opposite, or counter, to that of the feet and skis.
Counterrotation usually occurs in conjunction with heel push.
Foot Swivel: A form of turning power where the strength of the
lower legs is used to swing both ends of the skis so that they
swivel or pivot around directly underfoot. This is often used to
initiate parallel christies.
Heel Thrust: Using the toes or the shovels of the skis as pivot
points, the heels can be thrust to either side to produce a
powerful turning force.
Knee Crank: The knees, either singularly or together, can exert a
strong turning force when pushed in toward the center of an
intended turn.
Rotation: When any part of the body twists, or rotates, in the
direction of the turn, it can influence the turn. Thus, there can
be foot rotation, hip rotation, shoulder rotation, etc.
Steering: Snowplow and stem turns can be spoken of as steered turns
because the strength of the legs and feet is used to steer the skis
around.
Tip Thrust: By using the heels or the tail ends of the skis as
pivots, the tips can be thrust or pulled to either side to induce a
quick change of direction.
Turning Power: Any of the many sources of force used to initiate or
continue a turning movement of the skis.
Twisting Angulation: A combination of counterrotation and
angulation performed simultaneously. The result is often referred
to as the comma or reversed shoulder position.
It will thus be seen that the user can perform a series of
exercises, especially useful in practicing feet, ankle, leg and
body coordination, and including heel thrust, foot swivel, tip
thrust and combined displacement. More particularly, the user can,
by confining the movement of the base member 1 to the spherical
apex portion 2 and first conical area 3, limit the intensity of the
exercise, and thus it serves to begin muscular conditioning.
Following initial muscular conditioning, the user may increase the
intensity of the exercise by including the second conical area 4;
that is, the base member may be tilted to the position shown in
FIG. 4. Finally, the user may further intensify the exercise by
tilting the base member 1 to its extreme position, shown in FIG.
5.
The adjustable weight 18, by effecting change in the center of
gravity, changes the stability of the exerciser. More specifically,
if the weight is adjusted to its lower position, it is easier for
the user to balance on the exerciser. As the weight is adjusted
upward, greater skill is required in order to control the
exerciser. As a result, the user can proceed initially, with the
weight in its lowermost position, to manipulate the exerciser at
different angles; then, repeat this with the weight raised to
different levels until finally the weight is at its highest
position. Of course, the sequence of weight adjustment and angles
of tilt may be adapted to the needs and skill of the user.
The present embodiment of this invention is to be considered in all
respects as illustrative and not restrictive.
* * * * *