U.S. patent application number 10/644590 was filed with the patent office on 2004-04-22 for weight lifting plate.
Invention is credited to Gibson, Ronald S., Wallace, Richard S..
Application Number | 20040077466 10/644590 |
Document ID | / |
Family ID | 22103440 |
Filed Date | 2004-04-22 |
United States Patent
Application |
20040077466 |
Kind Code |
A1 |
Wallace, Richard S. ; et
al. |
April 22, 2004 |
Weight lifting plate
Abstract
A weight plate for use with a barbell or dumbbell which
incorporates a plurality of handgrips formed near the peripheral
surface of the weight plate. The handgrips have a transverse width
and radial height sized to provide a convenient gripping point for
individuals with smaller hands, such as women, children, or smaller
men. These small circumference handgrips are indented from the
outside edges of the weight plate to allow for more convenient
manipulation of the weight when the weight abuts against a solid
obstruction, such as another weight plate on a weight stack. This
indentation of the hand grips also provides protection for the
hands and fingers of a weight lifter manipulating the weight plate
in a weight lifting environment. The location of the handgrips of
the present invention also facilitate the lifting and transport of
the weight plate in the weight lifting environment, by reducing the
stresses on the weight lifter's shoulder joints.
Inventors: |
Wallace, Richard S.;
(Thousand Oaks, CA) ; Gibson, Ronald S.;
(Valencia, CA) |
Correspondence
Address: |
KNOBBE MARTENS OLSON & BEAR LLP
2040 MAIN STREET
FOURTEENTH FLOOR
IRVINE
CA
92614
US
|
Family ID: |
22103440 |
Appl. No.: |
10/644590 |
Filed: |
August 19, 2003 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
10644590 |
Aug 19, 2003 |
|
|
|
09071765 |
May 1, 1998 |
|
|
|
Current U.S.
Class: |
482/93 ;
482/107 |
Current CPC
Class: |
A63B 2208/12 20130101;
A63B 21/072 20130101; A63B 21/0783 20151001 |
Class at
Publication: |
482/093 ;
482/107 |
International
Class: |
A63B 021/06; A63B
021/072; A63B 021/075 |
Claims
What is claimed is:
1. A weight plate for physical fitness including: a plate body
formed with a central throughbore and having a plate periphery;
said body further formed with solely a triad of spaced apart
elongated handle openings disposed generally equiangularly and
positioned radially outwardly from said central throughbore and at
least midway out from the center of the body to said radial
periphery, said openings having respective outboard edges
cooperating with said plate to define a triad of integral handle
elements for grasping by a single hand to effect transport of said
weight plate.
2. A weight plate for physical fitness according to claim 1
wherein: said body is formed of a metallic material.
3. A weight plate for physical fitness according to claim 1
wherein: said body includes a protective coating thereon.
4. A weight plate for physical fitness according to claim 1
wherein: said body includes a chrome plating thereon.
5. A weight plate for physical fitness according to claim 1
wherein: said respective openings are oval shaped and positioned on
said body so that the fingers of a human hand can pass therethrough
and allow a thumb to wrap around said plate periphery.
6. A weight plate for physical fitness according to claim 1
wherein: said plate body is disc-shaped.
7. A weight plate for physical fitness according to claim 7
wherein: said plate periphery is substantially circular.
8. A weight plate for physical fitness according to claim 7
wherein: said plate periphery is substantially polygonal.
9. A weight apparatus including: a plate body formed with a central
throughbore and having a plate periphery; said body further formed
with solely a triad of spaced apart elongated handle openings
disposed generally equiangularly and positioned radially outwardly
from said central throughbore and at least midway out from the
center of the body to said radial periphery, said openings having
respective outboard edges cooperating with said plate to define a
triad of integral handle elements for grasping by a single hand to
effect transport of said weight plate; a bar having respective ends
wherein: said central throughbore is complementally sized for
slidable receipt on one of said bar ends.
10. An apparatus for use in physical fitness, comprising: a weight
plate having a central mounting hole passing transversely through
the plate; said plate having a peripheral surface; said plate
having a plurality of elongated openings spaced angularly around
the central mounting hole and located between said central mounting
hole and said peripheral surface; a plurality of handgrips formed
integrally with said plate, each of said handgrips sized and
adapted to comfortably accommodate a user's hand and being located
between one of said elongated openings and said peripheral surface;
and the angular spacing between the centers of each of the elongate
openings is less than 180.degree..
11. The apparatus of claim 10, wherein: said handgrips have an
octagonal cross-section.
12. The apparatus of claim 10, wherein: said handgrips have a
rectangular cross-section.
13. The apparatus of claim 10, wherein: said handgrips have a
circular cross-section.
14. The apparatus of claim 10, wherein: said weight plate has
beveled edges along said handgrips.
15. The apparatus of claim 10, wherein: said plate is comprised of
iron.
16. The apparatus of claim 15, wherein: said iron plate is coated
with rubber.
17. The apparatus of claim 15, wherein: said iron plate is chrome
plated.
18. The weight plate of claim 10, wherein said plurality of
openings comprises three openings; and each opening has a center
located at an angle of approximately 120.degree. with respect to
each other.
19. The weight plate of claim 18, wherein the weight plate has a
first transverse width in an area between the openings; said three
handgrips each having a second transverse width, and said second
transverse width is less than said first transverse width.
20. The weight plate of claim 18, wherein; said peripheral surface
of said plate is generally flat at locations adjacent to said three
handgrips and arcuate between the flat locations.
21. The weight plate of claim 20, wherein the elongate opening has
a substantially flat surface at the handgrip, and the elongate
opening surface is longer than the flat portion of the peripheral
surface.
22. The weight plate of claim 21, wherein the elongate opening has
a pair of substantially parallel elongate surfaces, and the
parallel surfaces have substantially the same lengths.
23. The weight plate of claim 22, wherein the parallel surfaces
each have first and second ends, and a first arcuate surface
extends between the first ends of the parallel surfaces and a
second arcuate surface extends between the second ends of the
parallel surfaces.
24. The weight plate of claim 19, wherein the difference between
the first and second transverse widths is large enough to
accommodate the bony portions of a human hand.
25. The weight plate of claim 24, wherein the difference between
the first and second transverse widths is at least 1/2 inch.
26. The weight plate of claim 10, wherein a first flat surface is
formed on the perimeter surface at one of the handgrips and a
second flat surface is formed on a side of the handgrip facing the
elongate opening, and the second flat surface is longer than the
first flat surface.
Description
RELATED APPLICATION
[0001] This application is a continuation of U.S. application Ser.
No. 09/071,765, which was filed on May 1, 1998, the entirety of
which is hereby incorporated by reference.
BACKGROUND OF THE INVENTION
[0002] It is well known that the muscle mass and strength of an
individual can be greatly increased through repetitive weight
lifting exercises, commonly known as "pumping iron." Various
weighted devices have been known for many years for use by
individuals in the course of body building exercises. The best
known of these devices are barbells and/or dumbbells, both of which
are exceedingly well-known in the art.
[0003] Barbells and dumbbells are typically constituted by weighted
elements interconnected by a bar or rod. The central section of the
rod or bar is sized so that it may be gripped by an individual's
hands, thus allowing the individual to lift and move the weighted
elements in a desired fashion. The dumbbell is generally a smaller
version of the barbell, sized to be manipulated by a single hand.
Virtually all muscle groups in the human body can be exercised
using barbells and/or dumbbells.
[0004] The weighted elements used in conjunction with dumbbells and
barbells come in numerous shapes and sizes, with many variations
shown in the prior art. For example, a 1912 patent, U.S. Pat. No.
1,047,212 to Hamilton, discloses a physical developer comprised of
a plurality of disk-shaped weights, each weight provided with a
central aperture, and a cross-bar across the aperture to serve as a
handle. The developer is used to exercise the muscles of the lower
neck, spine and lower limbs, and the individual weights can be used
as hand weights or dumbbells. A separate handle can also be
attached to the periphery of an individual weight to allow the
weight to be used as an "indian club."
[0005] U.S. Pat. No. 3,572,702 to Dorn discloses a hollow barbell
weight that can be filled with sand, cement or some other cheap
filling material. Once filled with the desired material, the hollow
weight is sealed closed with a plug, which is secured in place by a
circumferential band of rubber around the barbell weight. The
barbell weight has a central passage by which it fits onto a
bar.
[0006] U.S. Pat. No. 3,771,785 to Speyer discloses a barbell weight
having a specially designed "bore" by which the weight may be
secured onto a barbell bar without removing a collar or other
weight retaining device.
[0007] U.S. Pat. No. 5,137,502 to Anastasi et al ("the '502
patent") discloses a barbell weight plate having a pair of
diametrically opposed, elongated oval openings disposed parallel to
one another and equidistant from the central circular opening.
[0008] U.S. Pat. No. DES 354,322 to Vodhanel, Jr., discloses a
barbell weight plate having a plurality of openings in the weight
plate body, with these openings located adjacent the central bore
of the weight plate.
[0009] U.S. Pat. No. DES 355,007 to Rojas et al ("the '007 patent")
discloses a barbell weight plate having a pair of diametrically
opposed, elongated oval-shaped openings disposed parallel to one
another and equidistant from the central circular opening. In
addition, the '007 patent discloses a multi-sided "ring" at the
periphery of the weight, with the ring and the central portion of
the weight being the thickest sections of the weight plate.
[0010] U.S. Pat. No. DES 374,047 to Thielemann discloses a
hand-held exercise weight incorporating a handgrip with
indentations corresponding to the fingers and thumb of the
holder.
SUMMARY OF THE INVENTION
[0011] While barbells and barbell weight plates are well known in
the art, the present invention identifies and solves a number of
significant disadvantages inherent in prior art barbell weight
plates when used in an actual weight lifting environment.
[0012] One significant flaw inherent in prior art barbell weight
plates is the lack of any protection for a weight lifter's hand
and/or fingers when lifting and/or moving the weight plate. For
example, in the '502 patent disclosure the weight lifter desirably
grips the weight plate at the outer periphery, with his or her
fingers or thumb curling around the outer periphery of the weight
plate and into the openings. When the fingers or thumb are in this
position, and the side or edge of the weight plate comes in contact
with a solid obstruction, the weight lifter's fingers or thumb may
be "pinched" or crushed between the obstruction and the side of the
weight plate.
[0013] This flaw becomes even more apparent when observing how
weight lifters maneuver weight plates in an actual weight lifting
environment. Where multiple weight plates are being loaded onto a
barbell or weight lifting machine, the weight lifter will typically
grasp the plate by the handgrips, position the plate on the
cylindrical support bar, and then push the weight plate until it
comes in contact with the machine, bar-stop or other weight plates
already loaded. Typically, the force the weight lifter uses to push
the weight plate onto the bar is far more than the amount actually
required to move the weight along the bar, which results in the
weight plate striking the machine, bar-stop or already loaded
weight plate at a relative high speed, often with a resounding
"crash." Where the cylindrical support bar is biased or tilted such
that the weight plate slides down the bar due to gravitational
forces, the moving weight plate will often strike the stationary
object(s) at even higher speeds.
[0014] When a weight plate is moving in this manner, it can possess
a tremendous amount of kinetic energy. If the weight lifter is
distracted or not paying attention to the positioning of his or her
hands, his or her hands and/or fingers can accidentally come
between the moving weight plate and the stationary object.
Accordingly, there exists a need in the art for a weight plate that
provides protection for the hands and/or fingers of a weight lifter
who is manipulating the weight plate.
[0015] Another significant flaw in existing weight plates becomes
apparent when the weight plate is resting on its face on a flat
surface (in the prone position). Because the entire periphery of
the weight plate is in contact with the surface, the weight lifter
must either work his or her fingers under the weight plate, or must
grasp the sides of the plate with sufficient force so that friction
between the weight lifter's hand and/or fingers and the
circumference of the weight plate will be greater than the force of
gravity. The weight lifter must then simultaneously suspend a
portion of the weight plate in the air with his or her hand while
positioning his or her other hand under the plate. Often, the
weight plate will slip and fall two or three times before the
weight lifter can successfully lift the weight. Accordingly, there
exists a need in the art for a weight plate that can be easily
lifted from a prone position by a weight lifter, preferably using
only a single hand.
[0016] A similar problem exists when weight plates are placed side
by side (in a prone position or "stacked") on a barbell or weight
rack. In order to remove a weight from such a weight stack or rack,
a weight lifter must again attempt to move the weight plate by
grasping the weight about the outer periphery, and then forcing his
or her fingers into the gap between the weight plates. Where the
weight plates are located on a tilted weight bar or rack, the
difficulty with moving such weights is exacerbated. Accordingly,
there exists a need in the art for a weight plate that can be
easily and conveniently lifted from a weight stack or rack.
[0017] Another flaw in existing weight plates relates to the large
dimensions of the gripping surfaces incorporated into prior art
weight plates, such as those disclosed in the '502 patent. In
general, weight plates are constructed in standard sizes: 2.5, 5,
10, 25, 35, 45, and as much as 100 pounds per plate. Alternatively,
they may come in metric sizes, typically 1.25, 2.5, 5, 10, 15, 20
and 45 kilograms. This mixture of sizes allows weight lifters to
"mix and match" the weights on the barbell, thereby obtaining a
desired weight resistance on the bar. However, because an
increasing amount of material must be incorporated into the larger
size weight plates, larger weight plates are typically
proportionately larger than their smaller counterparts, with
proportionately larger gripping surfaces.
[0018] The large dimension of such oversized gripping surfaces was
not an important consideration while weight lifting was typically a
male-dominated sport. However, in the past decades, gyms and other
exercise facilities have experienced a dramatic increase in the
number of female members, many of whom excel at weight lifting and
"pumping iron." Because a woman's hand is typically smaller than a
man's hand, however, women often find it difficult to grasp and
carry the heavier weight plates dimensioned for the larger hands of
male weight lifters. Accordingly, there exists a need in the art
for a larger weight plate which incorporates gripping surfaces
convenient for use by individuals with smaller hands and/or
fingers.
[0019] These and other problems are solved by the present
invention, which incorporates one or more handgrips integrally into
a disk shaped weight plate for use with barbells or dumbbells.
These handgrips are dimensioned such that the transverse thickness
of the handgrips is less than the transverse thickness of the
weight plate such that, when the face of the weight plate contacts
a solid obstruction, the handgrip will not also directly contact
the obstruction.
[0020] In a preferred embodiment, the weight plate incorporates
three handgrips located adjacent to the periphery of the weight
plate. The sides of the weight plate overlap the sides of the
handgrip sufficiently to allow the weight plate to impact a solid
obstruction without causing damage to the hands and/or fingers of
the weight lifter. Furthermore, the reduced transverse width and
radial height of the handgrip allow an individual with very small
hands to grasp and safely carry even the heaviest of weight plates
by the handgrips.
[0021] Moreover, the reduced transverse width of the handgrip
allows a weight lifter to conveniently lift the weight even when
the weight is lying prone on a horizontal surface or is abutting
against a solid obstruction or adjacent weight plate. This is
because the handgrips in the disclosed weight plate do not directly
contact the horizontal surface or solid obstruction when the weight
plate is in the prone position, thereby allowing the weight lifter
to easily grip the handgrips with his or her fingers and/or hands,
and conveniently lift the weight plate.
[0022] In addition, because the handgrips of the preferred
embodiment are positioned adjacent to one another at an oblique
angle, this positioning allows a weight lifter to heft the weight
with his or her hands positioned in a non-vertical orientation,
thereby allowing the weight lifter's back muscles to carry a larger
proportionate share of the lifting load, and reducing stress on the
weight lifter's shoulder muscles and joints. Not only does this
allow the weight lifter to lift the weight easier, or to more
easily lift a larger weight plate, but the positioning and size of
the handgrips also allows the weight plate to be used as an
individual exercise device, if so desired.
[0023] Furthermore, because one embodiment of the generally
circular circumference of the weight lifting plate incorporates
generally flat surfaces adjacent the handgrips, these flat surfaces
tend to resist circumferential rolling of the weight plate, and
thereby serve to limit unwanted rotation and/or movement of a
barbell and/or dumbbell when the barbell and/or dumbbell has been
placed on a flat surface in the exercise facility.
[0024] It is an object of the present invention, therefore, to
provide an improved weight plate that may be used alone or in
conjunction with barbells and/or dumbbells.
[0025] It is a further object of the present invention to provide a
weight plate that furnishes protection for a weight lifter's hands
and/or fingers when the weight plate is lifted and/or
maneuvered.
[0026] It is a further object of the present invention to provide a
weight plate that can be easily lifted from a prone position.
[0027] It is a further object of the present invention to provide a
weight plate that can be easily and conveniently lifted from a
horizontal or tilted weight stack or rack.
[0028] It is a further object of the present invention to provide a
weight plate that allows individuals with small hands to safely
lift and move the weight plate.
[0029] It is a further object of the present invention to provide a
weight plate that allows a weight lifter to use both his or her
shoulder and back muscles to safely lift the weight when holding
the weight plate by the handgrips, thereby allowing the individual
to more easily lift the weight or lift heavier weights without
straining his or her shoulder muscles and joints.
[0030] Further features and advantages of the invention will be
described or will become apparent in the course of the following
detailed description and from an examination of the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The invention will be better understood from the ensuing
detailed description and the accompanying drawings of the preferred
embodiment, which are provided by way of example only, of
which:
[0032] FIG. 1 shows a frontal perspective view of a barbell weight
plate constructed in accordance with the present invention;
[0033] FIG. 2 shows a front plan view of the barbell weight plate
of FIG. 1;
[0034] FIG. 3 shows a right side view of the barbell weight plate
of FIG. 2;
[0035] FIG. 4 shows a sectional view of the barbell weight plate of
FIG. 2, taken along line 4-4;
[0036] FIG. 5 shows a front perspective view of a plurality or
"stack" of barbell weight plates constructed in accordance with the
present invention;
[0037] FIG. 6 shows a bottom plan view of the barbell weight plate
of FIG. 2;
[0038] FIG. 7 shows an enlarged partial bottom plan view of the
barbell weight plate of FIG. 6, taken along line 7;
[0039] FIG. 8 shows a top plan view of the barbell weight plate of
FIG. 2;
[0040] FIG. 9 shows a left side view of the barbell weight plate of
FIG. 2; and
[0041] FIG. 10 shows a rear plan view of the barbell weight plate
of FIG. 2.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
[0042] FIGS. 1 and 2 show one embodiment of a barbell weight plate
constructed in accordance with the present invention. The weight
plate 5 is a generally circular disk 10 having a central bore 15
and a peripheral surface 20. While the disclosed embodiment is a
generally circular disk, it should be understood that the weight
plate of the present invention could similarly be formed of
virtually any disk shape, including triangular, rectangular or
multi-sided disks, without affecting the utility of the present
invention.
[0043] The central bore 15 is sized to accommodate a support bar of
a barbell (not shown) in a manner well known to those of ordinary
skill in the art. The weight plate additionally incorporates one or
more openings 25, which are spaced from, but located in proximity
to, the peripheral surface 20. The openings 25 are desirably
elongated ovular openings, having an outer edge 28 which is
substantially flat and perpendicular to the central bore 15 of the
weight plate 5. Of course, other shapes for the openings may be
used, including rectangular or circular openings. Between the
openings 25 and the peripheral surface 20 are handgrips 30, formed
integrally with the circular disk 10.
[0044] The outer edge 35 of the handgrips 30 are desirably flat,
such that they are parallel to the outer edge 28 of each respective
opening 25. Accordingly, the height H of the handgrip remains
constant, which allows the weight lifter to maintain a secure grip
on the handgrip. The outer edge 35 of the handgrips 30 transition
smoothly from and to the curved peripheral surface 20 of the weight
plate 5. The edges 37 of the peripheral surface 20 of the weight
plate, and the inside surface of the openings 25 adjacent the
handgrips 30, are beveled. This provides smooth edges for the
weight plate 5 and reduces the overall outer dimensions of the
handgrips 30. Of course, the handgrips 30 could be configured in
various other cross-sectional shapes, including cylindrical,
rectangular, or triangular cross-sections, or could even
incorporate grooves for the individual fingers of the weight
lifter's hand.
[0045] As can be best seen from FIG. 3, the handgrips 30 have a
transverse width Wt, which is thinner than the transverse width Wd
of the weight plate. As seen in FIG. 4, the weight plate 5
preferably has a central field portion 19 having a transverse width
Wc that is different than both the handgrip transverse width Wt and
the weight plate transverse width Wd. In the embodiment shown, the
body central field portion 29 transverse width Wc is greater than
the handgrip transverse width Wt, but less than the weight plate
transverse width Wd. The thinner transverse width Wt of the
handgrip allows the weight lifter's hands and/or fingers to be
substantially recessed when gripping the weight plate 5, such that
the solid portions of the weight lifter's hands and/or fingers
(i.e., the hand and finger bones) are at or below the outer face 17
of the weight plate 5. If the weight plate strikes a solid
obstruction along its outer face 17, the outer face 17 of the
weight plate 5 will absorb the majority of the impact without
seriously damaging the solid portions of the weight lifter's hands
and/or fingers.
[0046] A 25 pound weight plate, constructed in accordance with a
preferred embodiment of the present invention, is advantageously a
generally circular disk approximately 13.125 inches in diameter,
with a transverse disk thickness Wd of approximately 1.875". The
central bore of the weight plate is a concentric opening
approximately 2" in diameter, which is sized to accommodate a
standard size barbell support bar. Three openings 25 are positioned
approximately 120.degree. apart from each other, and are elongated
ovular openings with a length L of approximately 5.25" and a height
Ho of approximately 1.25".
[0047] The handgrip 30, formed between the openings 25 and the
peripheral surface 20, desirably has a height Hh of approximately
11/2" and a transverse width Wt of approximately 1". The outer edge
35 of the handgrip 30 is an approximately 4" flat surface which is
perpendicular to the central bore 15 of the weight plate 5.
[0048] The dimensions of the disclosed handgrip 30 desirably permit
a weight lifter to grip the handgrip by wrapping his or her thumb
around one side of the handgrip, and then inserting his or her
fingers into the opening(s) 25 and curling the fingers around the
handgrip 30, such that his or her fingertips contact the edge of
the handgrip opposite the weight lifter's palm. This results in a
very strong grip on the weight which not only gives the weight
lifter a greater feeling of security, but also greatly reduces the
chance of the weight slipping out of the weight lifter's grasp.
Furthermore, the present invention allows the manufacture of weight
plates of increasing sizes without significantly increasing the
dimensions of the handgrips, thereby allowing weight lifters with
even very small hands to conveniently and safely manipulate even
the heaviest of weight plates. Of course, the dimensions of the
handgrips could also be further reduced to accommodate extremely
small hands, if so desired.
[0049] The transverse width Wt of the handgrip 30 is thinner than
the width Wd of the weight plate 5 at its periphery. Where the
outer face 17 of the weight plate 5 meets the handgrips 30, the
sides of the weight plate are tapered from the width Wd to the
width Wt. These tapers 41 provide a gradual transition from the
thicker width Wd of the weight plate to the thinner width Wt of the
handgrip, which encourages the weight lifter to grasp the handgrips
at their thinnest portions, thereby reducing the possibility of the
weight lifter's hand being in contact with the outer face or a
comer of the weight plate if the weight plate strikes a solid
obstruction. This significantly reduces the chance of pinching the
hand and/or fingers of a weight lifter who is grasping the weight
plate. Desirably, the width Wt of the handgrips 30 should be at
least 1/2" thinner than the transverse width Wd of the weight plate
5, which will resulting in the outer face 17 of the weight plate
overlapping each side of the handgrips 30 by at least 1/4". A
weight lifter lifting such a weight plate by the handgrips will not
have his or her hands and fingers projecting significantly beyond
the outer face of the weight plate as they would in prior art
weight plates. Of course, the handgrips may be thicker or thinner,
depending upon the desired handle geometry and the convenience of
the weight lifter. For example, by reducing the transverse
thickness of the handgrip, but maintaining the transverse thickness
of the weight plate, the overlap would be increased (thereby
increasing safety for the weight lifter) while the circumference of
the handgrips would be reduced (to accommodate the smaller hands of
petite women or even children).
[0050] When a weight lifter manipulates a weight plate constructed
in accordance with the present invention, he or she will grasp the
weight plate by the handgrips, positioning his or her hand along
the side of the handgrip, with the fingers curling through the
opening and possibly extending along the opposite side of the
handgrip. If the weight plate comes in contact with a solid
obstruction, the weight lifter's hand and/or fingers will not be
severely pinched between the weight plate and the obstruction, as
would occur with prior art weight plates, but will rather only be
"squeezed" between the handgrip and the obstruction before the
projecting portions of the weight plate contact the obstruction,
thereby stopping further squeezing of the weight lifter's hand
and/or fingers. Accordingly, the gap formed by the reduced width of
the handgrip will prevent the bones of the hand and/or fingers from
being severely injured by the impact. Moreover, the joints of the
weight lifter's hand and/or fingers are similarly protected from
being pinched between the weight plate and the obstruction.
[0051] FIG. 5 shows a barbell holding multiple weight plates,
otherwise known as a "stack" of weights. Because the handgrips are
thinner than the transverse width Wd of the weight plates, when the
weight plate abuts against a solid obstruction, a gap or space will
exist between the handgrip and the obstruction. When two adjacent
weight plates are oriented such the handgrips on each weight plate
are aligned, such as depicted in FIG. 5, this gap 44 is even more
pronounced, thereby effectively doubling the distance between
adjacent handgrips and further increasing the safety for the weight
lifter's hands and fingers. If such orientation is desired,
interlocking projections can be formed on the sides of the weight
plates to bias the weight plates with respect to each other in a
manner well known to those of ordinary skill in the art.
[0052] The present invention also facilitates the removal of
weights from such a weight stack. Because the handgrips of the
present invention are offset from the adjacent solid surface or
adjacent weight plate, a weight lifter can easily insert his or her
fingers into one or more of the gaps 44, can then conveniently pull
the weight towards the end of the support bar, and then safely lift
the weight plate off the support bar without removing his or her
hands from the handgrips. Moreover, where the weights are stored on
a tilted support bar, the present invention allows the weight
lifter to easily grip the handgrips of the weight in its stored
position, and then lift the weight plate and slide it up along the
support bar without requiring additional steps such as working his
or her fingers between the close edges of the plates.
[0053] In a similar manner, the present invention will allow a
weight lifter to easily heft and move weight plates lying flat on
the ground. As previously mentioned, when prior art weight plates
were resting flat on the ground, there was no projecting edge or
indentation that a weight lifter could use to gain purchase on the
circumferential edge of the weight plate prior to lifting it off
the ground. This forced the weight lifter to attempt to work his or
her fingers under the edge of the weight plate, or to try and lift
the weight plate using frictional forces on the circumference,
often with less than favorable results. In contrast, the present
invention provides an easily accessible indentation or gap between
the floor and the handgrip, which can be used even when the weight
plate is lying flat on its face. The weight lifter need merely
insert his or her fingers into the gap between the handgrip and the
floor, and then easily lift the weight plate off the floor.
[0054] The geometry of the present invention also greatly
facilitates transport of the weight plate through the exercise
facility. It is well known in the weight lifting art that the
orientation of a weight lifter's hands during lifting exercises can
significantly affect which muscle groups are actually exercised.
For example, in performing a "Frontal Dumbbell Raise" exercise, a
weight lifter will completely extend his or her arm downward, will
grasp a dumbbell in the extended hand with the palm facing
downward, will maintain his or her arm in the extended position
while lifting the dumbbell in front of him/her, and will raise the
dumbbell until it is in front of the weight lifter, even with his
or her chin. During this exercise, the weight lifter will maintain
his or her hand palm in a downward orientation, with the
longitudinal axis of the dumbbell bar parallel to the floor. This
orientation allows the weight lifter to utilize both shoulder and
back muscles, in conjunction, to lift the weight.
[0055] If, however, the weight lifter rotates his or her hand
approximately 90.degree., so that the palm of the hand faces
towards the side, and the longitudinal axis of the dumbbell bar is
perpendicular with respect to the floor, the change in hand
orientation significantly alters the relationship between the
shoulder and back muscles. In this orientation, the weight lifter's
back muscles will contribute significantly less effort to lift the
weight, thus forcing the shoulder muscles to bear a larger share of
the load. This results in increased stress on the shoulder muscles
and, more significantly, increased stress on the rotator cuff in
the shoulder. Furthermore, because only the shoulder muscles are
being used to lift the weight, the weight lifter will be able to
lift less weight, even though the basic motion of the exercise has
not changed.
[0056] The same result occurs when a weight lifter manipulates
weight plates in a gym. Because prior art weight plates having
handgrips position these handgrips diametrically opposed to each
other (oriented 180.degree. apart), a weight lifter seeking to lift
such a weight plate using two hands (and thus both handgrips) is
forced to orient his or her hands along the vertical axis rather
than along the much more efficient horizontal axis, resulting in
increased stresses in the shoulder muscles and rotator cuff when
moving the weight plate.
[0057] By shifting the longitudinal axis of the handgrips away from
the horizontal axis, the weight plate of the present invention
significantly reduces stresses experienced by the weight lifter in
the shoulder muscles and rotator cuff of the shoulder joint. Thus,
the weight lifter is able to more easily move weight plates, or
lift heavier weight plates, with less effort than with prior art
weight plates, while still using the handgrips to grasp the weight
plate.
[0058] The orientation of the handgrips in the present invention
also allows the weight plate to be more safely used as an
individual exercise device. For example, if a weight lifter desired
to simulate a "front dumbbell raise" using both hands and the hand
holder of a prior art weight plate, the weight lifter would have to
grasp the diametrically opposed handgrips, thus orienting his or
her hands along the vertical axis when performing the exercise.
While the weight lifter would experience the added safety of using
the handgrips, he or she would also be forced to position his or
her hands at the less-than optimal vertical orientation, thus
dramatically increasing stresses in the shoulders. This would
result in less than optimal results.
[0059] The weight plate of the present invention allows a weight
lifter to more safely perform such exercises. When the weight
lifter wishes to simulate a "front dumbbell raise" using a weight
plate, the weight lifter need merely grasp the weight plate by two
of the handgrips, and then lift the weight plate in front of
him/her in the manner previously described. The angled orientation
of the handgrips allows the weight lifter to exercise both the back
and shoulder muscles with minimal stresses on the shoulder
joints.
[0060] In addition, by incorporating additional handgrips into
alternate embodiments, the present invention would provide weight
lifters with various handgrip orientations, thereby allowing the
weight lifter to choose various hand positions and focus his or her
exercise on various desired muscle groups. For example, a weight
plate constructed in accordance with the present invention, having
five handgrips oriented 72.degree. apart, would also provide a
weight lifter with convenient gripping surfaces located 144.degree.
or 216.degree. apart. Also, a weight plate could have handgrips
positioned asymmetrically about the central mounting hole.
[0061] The geometry of the present invention also limits movement
of the barbell and/or dumbbell when placed on a flat surface such
as the floor of the exercise facility. Because the generally
circular circumference of the weight lifting plate incorporates
generally flat surfaces adjacent the handgrips, these flat surfaces
tend to resist circumferential rolling of the weight plate, and
thus serve to limit movement of the barbell and/or dumbbell
containing such weight plates. Accordingly, the present invention
will prevent unwanted rotation and/or movement of a barbell and/or
dumbbell when the barbell and/or dumbbell has been placed on a flat
surface in the exercise facility.
[0062] The invention has been described with particular reference
to certain preferred embodiments. Of course, various obvious
modifications can be made without departing from the spirit of the
invention and such modifications are intended to be within the
scope of the following claims, either literally or under the
doctrine of equivalents, whether or not expressly described in the
above text or illustrated in the accompanying drawings.
* * * * *