U.S. patent number 3,784,194 [Application Number 05/245,742] was granted by the patent office on 1974-01-08 for bilateral reciprocal isokinetic exerciser.
Invention is credited to James J. Perrine.
United States Patent |
3,784,194 |
Perrine |
January 8, 1974 |
BILATERAL RECIPROCAL ISOKINETIC EXERCISER
Abstract
An Isokinetic Exerciser for exercising the limbs of a person
bilaterally reciprocally includes an actuator means with
simultaneous reciprocal force receiving input members on opposite
ends of the actuator. A limb supporting lever is attached to each
of the force receiving members. The actuator is coupled to a valve
which adjustably controls the limit speed of rotation of the levers
effectively independent of the forces applied thereto by
controlling the flow of fluid through the valve.
Inventors: |
Perrine; James J. (San Diego,
CA) |
Family
ID: |
22927900 |
Appl.
No.: |
05/245,742 |
Filed: |
April 20, 1972 |
Current U.S.
Class: |
482/113; 60/571;
482/112 |
Current CPC
Class: |
A63B
21/0083 (20130101); A63B 21/00069 (20130101); A63B
2220/56 (20130101); A63B 21/008 (20130101); A63B
2208/0233 (20130101) |
Current International
Class: |
A63B
21/008 (20060101); A63b 023/04 (); A63b
021/00 () |
Field of
Search: |
;272/58,80,54,79G
;60/54.5R ;91/186,435 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Pinkham; Richard C.
Assistant Examiner: Browne; William R.
Claims
The invention claimed is:
1. An isokinetic bilateral reciprocal exerciser comprising
an actuator means for transmission of forces exerted by a user,
said actuator means having two force receiving means, said actuator
means having one of said force receiving means mounted at one end
of said actuator means for applying a user's force so that when
said latter mentioned force receiving means is moved in one
direction a user's force will be transmitted to the opposite end of
the actuator means to simultaneously move the other force receiving
means mounted at the opposite end of the actuator means in an
opposite direction, each of said force receiving means being
movable through planes that are substantially parallel to each
other, and means for supporting both of said force receiving means
in spaced relationship to each other so that a user may position,
respectively, each of his limbs simultaneously on both of said
force receiving means during an exercise program,
a limb supporting lever means coupled to each of said force
receiving means, means for receiving a force exerted by a user
and
an isokinetic speed controlling means connected to said actuator
means for controlling the speed of motion of said force receiving
means effectively independent of the force applied to said limb
supporting lever means once the speed of motion of said force
receiving means has reached a predetermined value.
2. An isokinetic bilateral reciprocal exerciser as defined in claim
1, further including means for adjustably setting said speed
controlling means to obtain different selected control speeds of
rotation of each of said force receiving means.
3. An isokinetic bilateral reciprocal exerciser as defined in claim
1, wherein said actuator means include a first gear and a second
gear axially spaced from each other and meshed with each other at
one end of said actuator means, and a third gear, a fourth gear and
a fifth gear each axially spaced from each other at the other end
of said actuator means, said fifth gear being an idler gear meshed
with said third gear and said fourth gear; and a rotatable shaft
coupled to said first and third gears in coaxial array at opposite
ends of said actuator means, said second and said fourth gears
being disposed in coaxial alignment, whereby said first and said
second gears rotate in opposite directions, said second and said
fourth gears rotate in opposite directions, and said first, said
third, and said fourth gears rotate in the same direction when a
connection of said lever means between said second and said third
gears effects coaxially rotation in opposite directions of said
spaced apart lever means and a connection of said lever means to
said second and said fourth gears effects coaxial rotation of each
of said lever means in an opposite direction.
4. An isokinetic bilateral reciprocal exerciser as defined in claim
3, further including adjustment means for adjustably setting said
speed controlling means to obtain different selected maximum speeds
of rotation of said gears and said lever means.
5. An isokinetic bilateral reciprocal exerciser as defined in claim
3 wherein said lever means comprises
a pair of levers;
a pair of apertured flanges, each of said levers, respectively,
secured to one of said apertured flanges for attachment to one of
said gears at opposite ends of said actuator means; and
limb engaging means on said levers to keep a person's limbs engaged
on said levers during movements thereof.
6. An isokinetic bilateral reciprocal exerciser as defined in claim
4, wherein said actuator means further includes
a pair of spaced plates;
a cylinder secured between said plates;
said shaft extending axially through said cylinder;
a rotor secured to said shaft;
a stator secured to said cylinder
end bushings closing opposite ends of said cylinder;
said rotor, said stator, said cylinder and said bushings defining
two fluid filled chambers in said cylinder,
said plates being formed with ports communicating with said two
chambers for passing fluid out of one chamber and into the other
chamber when said rotor rotates, and the speed of rotation of said
gears being controlled by the rate of flow of fluid passing between
said chambers.
7. An isokinetic bilateral reciprocal exerciser as defined in claim
6, wherein said speed controlling means comprises a pair of fluid
filled valve assemblies having respectively, a casing communicating
with said ports; said controlling means comprising an adjustment
means for rotating a rotatable valve member adjacent a
non-rotatable valve member in each of said valve casings, said
valve members having abutting walls with adjustably overlapping
holes defining a passage for fluid, and the rate of flow of fluid
and speed of rotation of said gears being determined by the size of
said passage.
8. An isokinetic bilateral reciprocal exerciser as defined in claim
7 wherein said non-rotatable valve member is axially slidable
against a spring bias, each of said valve casings having lateral
holes closable by said non-rotatable axially slidable valve to
limit flow of fluid and resist acceleration of rotation of said
gears and said respective levers.
9. An isokinetic bilateral reciprocal exerciser as defined in claim
6, further comprising pressure indicating means operatively
connected to said valve assemblies for indicating pressure of said
fluid in said valve casings.
10. An isokinetic bilateral reciprocating exerciser as defined in
claim 8, further including an accumulator means partially filled
with fluid and connected to said valve assemblies for relieving
excess pressure due to thermal expansion.
11. An isokinetic bilateral reciprocating exerciser as defined in
claim 1 wherein said actuator means comprises
a cylinder;
a piston axially movable in said cylinder, and
a coupling means for connecting each side of said piston,
respectively to each one of said limb supporting lever means.
12. An isokinetic bilateral reciprocating exerciser as defined in
claim 11 wherein said coupling means comprises a plastic coated
cable.
Description
This invention is directed at an isokinetic exerciser and more
specifically to a bilateral-reciprocal isokinetic exerciser.
My isokinetic exerciser disclosed in U.S. Pat. No. 3,465,592,
describes an isokinetic apparatus of the type wherein a user moves
one or both arms and legs together in the same direction against an
accommodating resistance at a controlled speed. By contrast, the
present invention is directed to an Isokinetic exerciser which
provides for simultaneous bilateral-reciprocal movement of two
limbs.
According to the invention there is provided an isokinetic
bilateral reciprocal exercising device comprised of an actuator
means with simultaneous reciprocal motion inputs on opposite sides
of the actuator and a limb supporting lever is connected to each of
the inputs. The actuator incorporates control means for controlling
the speed of movement and providing an accommodating resistance to
the limb supporting levers. In one embodiment the actuator may be a
rotary hydraulic actuator in which a rotor is driven via a gear
train and attached levers by the leg movements of a user.
It is therefore the principal object of the present invention to
provide a bilateral-reciprocal isokinetic exerciser for exercising
the upper or lower limbs in a simultaneously bilateral reciprocal
movement pattern against isokinetic loading.
It is another object of the present invention to provide a
bilateral-reciprocal isokinetic exerciser which will permit
physically handicapped patients to practice the coordinated
bilateral-reciprocal lower limb movements needed for efficient
ambulation.
These and other objects and many of the attendant advantages of
this invention will be readily appreciated as the same becomes
better understood by reference to the following detailed
description when considered in connection with the accompanying
drawings in which:
FIG. 1 is a perspective view of an exerciser device for exercising
lower limbs of a seated patient, shown installed on a stand with a
seat for the patient;
FIG. 2 is an enlarged partially exploded perspective view of the
actuator;
FIG. 3 is a right side elevational view of the device illustrated
in FIG. 2;
FIG. 4 is a left side elevational view of the device illustrated in
FIG. 2;
FIG. 5 is an enlarged central vertical sectional view taken along
line 5--5 of FIG. 2;
FIG. 6 is a cross-sectional view taken along line 6--6 of FIG.
5;
FIG. 7 is a fragmentary sectional view taken along line 7--7 of
FIG. 3;
FIG. 8 is a longitudinal sectional view taken through a control
valve along line 8--8 of FIG. 4;
FIG. 9 is a fragmentary vertical sectional view taken along line
9--9 of FIG. 8;
FIG. 10 is an exploded perspective view of the control valve and
associated parts; and
FIG. 11 is a perspective view of another actuator used with my
exerciser device.
Referring, now to the drawings wherein like reference characters
designated like or corresponding parts throughout, there is
illustrated in FIGS. 1 through 4 an exerciser device generally
designated as reference numeral 20 mounted on a platform 22. The
exerciser device 20 includes an actuator housing 21 having two
massive rectangular vertical side plates 24, 26 each of which is
provided with a threaded bottom hole 28 which receives a bolt 30
securing the exerciser 20 to the platform 22. A threaded hole 32
(FIG. 4) in each upper end of the walls 24, 26 defines a bolt (not
shown) for securing a seat frame 34 to the top of the exerciser
device 20. A seat 36 is mounted on the frame 34 by any conventional
well known fastener means. Secured to the frame 34 is a backrest 38
and a pair of lateral arms 40. A person using the exerciser may sit
on the seat 36 and place each of his feet through a loop 41 of a
pedal 42 secured to a forward end 44a of an L-shaped lever 44,
located on each side of the exerciser 20. The levers 44 turn in a
vertical plane parallel to the plates 24, 26 and each of the levers
have a short inwardly turned arm 46 which terminates at the hub or
flange 48 (FIG. 2). In this embodiment, the hub or flange 48 is
located at opposite sides of the exerciser 20, and each flange 48
provides a separate input to the actuator housing 21. The hub or
flange 48 may be selectively bolted to gears (54, 56 and 58, 60) at
opposite ends of the exerciser as will thereinafter be more fully
described.
A plurality of bolts 50 secured by nuts 51 extend through the
plates 24, 26 and hold them in abutment with opposite ends of a
cylindrical fluid-filled rotary actuator tube 52. At the outer side
of the plate 24 is a pair of mating spur gears 54, 56 which rotate
in opposite directions. At the outer side of the plate 26 is
another pair of mating spur gears 58, 60 which rotate in the same
direction with respect to one another.
Two valve assemblies generally designated as reference numberals 64
and 66 extend between the plates 24, 26 and each has a control knob
68 secured on a rotatable valve control shaft 72 which extends
axially from the valve casing 74.
A fitting 76 is secured in a bore 80 and 82 with each fitting
carrying a flexible tube 84 to provide communication between a
pressure gauge 88 and the interior of the valve assemblies 64 and
66. A fitting 92 in a bore 94 at the top of the plate 26 carries a
flexible tube 95 which provides communication between the interiors
of the value casings 74 and a pipe 96 which is closed at the upper
end by a cap 97 and is partially filled with a fluid 98. The fluid
98 which may be a free flowing oil fills the tube 95, the tubes 84
and the interiors of the valves 64 and 66 and the actuator tube 52.
The tube 95 is attached to the lower end of the pipe 96 by a
fitting 93.
The lower gears 56 and 60 rotate on respective shafts 102 journaled
in bearings in the end plates 24, 26. The shafts 102 are axially
aligned between the end walls 24, 26 by shaft 100. The upper gears
54 and 58 are secured to opposite ends of a horizontal shaft 103
extending axially of the actuator tube 52 (see FIG. 5). The gears
54,56,58,60 are provided with threaded holes 104 which receive
bolts 106 by means of which the mounting flanges 48 can be secured
to selected gears at opposite ends of the exerciser device.
An idler gear 62 rotates on a fixed shaft 105 bolted to the end
wall 26, as best viewed in FIGS. 3 and 7. Supporting a shaft 108
inside the actuator tube 52 are bushings 110 and 111 (FIGS. 5, 6)
which are sealed by O-rings 112 in respective grooves 114. The
periphery of the bushings 110, 111 is enclosed by the actuator tube
52 and is sealed by O-rings 113 to keep the fluid 98 inside the
actuator tube 52. Within the shaft 108 is a tie bolt 103 to which
is attached the gear 58.
Mounted on the shaft 108 by a plurality of bolts 115 is a radially
extending rotor 116 (FIG. 6) which is provided with seals 118
secured thereto at opposite faces of the rotor. The rotor seals 118
snugly fill the actuator bore radially between the shaft 108 and
the actuator tube 52 and axially between the bushings 110 and 111.
The rotor 116 can turn in either direction between opposite faces
of a stator 120 which is secured by a plurality of bolts 122 to the
inside of the actuator tube 52. The shaft 108 clears the inner
concave side of stator 120 which is provided with seals 123 secured
thereto at opposite faces thereof. The stator seals 123 fill a
space radially between the shaft 108 and the actuator tube 52 and
axially between the bushings 110 and 111. The rotor 116 and the
stator 120 constitute movable and fixed partitions respectively
which divide the interior of the actuator tube 52 into two chambers
125a and 125b both of which are filled with the fluid 98. A pair of
ports 126, 128 in the bushing 110 open into the chambers 125a and
125b respectively and communicate with the bores 80, 82
respectively in the end plate 24.
Both valve assemblies 64 and 66 are identical in construction so a
description of one valve assembly will suffice for both. Reference
is now made to FIGS. 6, 8, 9 and 10 wherein each valve assembly 64
and 66 includes the cylindrical hollow stationary valve casing 74
in which is secured a cylindrical liner 149. The distal end of the
casing 74 is closed by a plug 150 which is secured in a hole 152 in
the end plate 26 by a plurality of bolts 153. The distal end of the
valve casing 74 is seated in the hole 152 and is sealed by a gasket
155 and O-rings 145, and 147. A plurality of holes 156 are formed
in the cylindrical liner 149 of the valve casing 74 near its distal
end (see FIGS. 8 and 10). A plurality of slots 159 are formed in
the valve casing 74 to expose holes 156 which communicate with the
vertical bore 94 in the plate 26. The distal end of the valve
casing 74 in hole 152 communicates with a pipe 96 via the bore 94
the fitting 92 and the tube 95. The pipe 96 serves as an
accumulator for the fluid 98 in a manner explained further
below.
The proximal end of each valve casing 74 is set in a hole 160 in
the plate 24, which is closed by a plug 162 and sealed by a gasket
164 at an abutment 165. Control rods or shafts 72 extend axially of
the respective valve casings. An O-ring 163 seals the end of the
valve casing at the abutment 165 in the plate 24. The shaft 72
carries a diametral cross pin 166 at its inner end which is engaged
in diametrically opposed slots 168 formed in a cylindrical valve
member 170. The valve member 170 has an open proximal end and a
wall 172 at the distal end of the valve member which is formed with
a crescent shaped hole 174; see FIGS. 8, 9, 10. A coil spring 175
in the valve member 170 which is compressed between the pin 166 and
the end wall 172 urges the valve member 170 into contact with an
apertured end wall 176 of another cylindrical valve member 180. The
valve member 170 is freely rotatable whereas, the value member 180
is movable axially but is held non-rotatably in the value casing. A
pair of diametrically opposed slots 182 are formed in valve member
180. A fixed pin 184 extends diametrally of the valve casing
through the slots 182 and is seated in holes 185 in the cylindrical
liner 149 of the valve casing. The pin 184 prevents rotation of
valve member 180 but permits axial movement of valve member 180, so
that it can move under fluid pressure to the right as viewed in
FIG. 8 for closing holes 156 and closing off the interior of the
valve casing from bore 94. A compressed coil spring 186 in the
valve member 180 is located between the pin 184 and the end wall
176. This spring keeps valve member 180 retracted from holes 156.
End wall 176 has a crescent shaped hole 188 which can register with
the hole 174 in the end wall 172 of the valve member 170 in one
position of the valve member 170. By rotation of the valve member
170 holes 174 and 188 can be overlapped or misaligned for partially
or completely closing the passage for flow of fluid 98 between the
interiors of the two valve members 170 and 180. It will thus be
apparent that rotation of knob 68 and valve control shafts 72 can
adjust the size of passage defined by the intersecting holes 174,
188 in the walls 172, 176 for determining the rate of pressure
compensates oil flow through the casings. The proximal ends of the
valve casings are provided with projections 190 by means of which
the end of the valve casing is spaced from the annular abutment 165
extending across the hole 160 in the plate 24. There is thus
defined a passage between the interior of each valve casing at its
proximal end in the plate 24 and the bore 80 or 82 communicating
with the nipple 76. In addition, the bore 80 communicates with the
hole 126 and the bore 82 communicates with the hole 128 in the
bushing 110 as hereinbefore mentioned.
It will now be apparent from an inspection of the drawings, that
the gears 54, 58 and 60 rotate in one direction and that the gears
56 and 62 rotate in a direction opposite thereto. By this
arrangement, four different movements of the levers 44, 45 are
possible as follows:
1. Coaxial, reciprocal movements in opposite directions--obtained
by attaching the flange 48 to the axially aligned gears 56 and 60
at opposite ends of the exerciser device.
2. Coaxial, simultaneous in-line movements--obtained by attaching
the flange 48 to the axially aligned gears 54 and 58.
3. Reciprocal movements in opposite directions on vertically spaced
horizontal axes--obtained by attaching the flange 48 to the axially
spaced gears 56 and 58, or 56 and 54.
4. Simultaneous in-line movements on vertically spaced horizontal
axes--obtained by attaching the flange 48 to the axially spaced
gears 54 and 60.
The operation of the exerciser device will now be explained.
Suppose first for purposes of illustration, that flange 48 is
attached to the gear 56 and 60 for reciprocal movements in opposite
directions as indicated in arrangement No. 1 above. The person
operating the device sits on the seat 36 with his feet engaged in
the loops 41 of the pedals 42. The knob 68 is turned to overlap the
holes 172, 188 in the valve member 170, 180 to any desired extent.
The positions of the arrows on the knobs indicate the valve
settings. The arrows might be set parallel to each other so that
both of the valve assemblies have substantially the same setting.
Now the person alternately extends one leg forcefully while the
other leg rises automatically due to reciprocal movements of the
levers. The speed with which the levers 44, 45 reciprocate is
automatically controlled by the apparatus. The control speed can
only be changed by turning the control shaft 72 to adjust the valve
assemblies 64, 66. The manner in which these automatic controls are
effected will now be explained.
Suppose the gear 56 moves clockwise as viewed in FIG. 6 to raise
the attached lever 44 while the opposed gear 60 moves
counterclockwise with the shaft 108, and the rotor 116. This will
cause a reduction of volume in the chamber 125a and an increase in
the volume of the chamber 125b. The fluid 98 will be forced out of
the chamber 125a through the hole 126 in the bushing 110, and
through the bore 80 to the proximal end of the upper valve casing
74 where the fluid 98 enters the casing 74 and passes through the
valve members 170, and 180. At this point it will be understood
that if the valve holes 174 and 188 are not at least partially
overlapping, the passage for fluid will be closed and no rotational
movement of the gears and levers will be possible. The rate of
fluid flow is determined by the size of the passage defined by the
overlapped holes 174, 188. From the valve member 180 in the upper
casing 74 the fluid flows through the holes 156 to the bore 94 and
to the lower valve casing 74. The fluid passes through the lower
valve members 180 and 170 in turn to the bore 82 and enters the
chamber 125 through the hole 128 in the bearing plate 110. Varying
the force applied to the pedals 42 cannot have any material effect
in varying the speed of movement since this is primarily limited by
the compensating action of the valve member 180. When a leg
movement reaches the control speed, the resulting pressure drop
across the orifice defined by overlapping holes 174, 188 will cause
the valve member 180 to move to the right as viewed in FIG. 8, to
close a portion of the holes 156 and increase the fluid pressure
thereby resisting acceleration of the gears and levers. The
restraining force acting on the pedals thus accommodates to
effectively match the force applied by the leg at the control
speed.
When the rotor 116 reaches the stator 120, angular turning motion
of the levers is stopped. The lever 45 attached to the gear 60 is
now raised and reverse motion of the levers can not be effected.
Now the rotor 116 will turn clockwise as viewed in FIG. 6 to
increase the volume of chamber 125a and reduce the volume of
chamber 125b.
It will be apparent that by setting the valve members in both valve
assemblies to defined passages of equal size, the levers 44 and 45
will turn with substantially equal speed in both directions of
movement. If the passage in the upper valve assembly 64 is set
larger than the passage in the lower valve assembly, the lever 44
will move at a faster speed than the lever 45. In order to
compensate for temperature changes and resulting expansion or
contraction the fluid passes via the bore 94 to the reservoir pipe
96 and the air chamber 99 alternately contracts and expands
accordingly.
The same speed controls are effective when the flanges 48 are
attached to any other pair of gears listed above. When up and down
simultaneous movement of both the lever 44 and 45 is desired the
flanges 48 will be attached to gears 54, 58 or 54, 60 as mentioned
above. Then the patient or user may force both legs up and down
simultaneously with the speed controlled by the valve settings as
previously described. If desired, an attendant may manually raise
the levers 44, 45 after they have been fully lowered by the
patient.
Referring now to FIG. 11 there is shown another actuator 200
supported by the side walls 24, 26. Actuator 200 is a conventional
cylinder 201 having end plates 206 and a reciprocal piston 210
which divides the cylinder into two chambers. The piston 210 is
connected via couplings 209 to a plastic coated cable 202 which
exits through each chamber from the cylinder 201 at each input end
of the actuator 200. The cable 202 travels around a pulley 204 and
205 where it is anchored by conventional means (not illustrated).
Each hub or flange 48 of the respective L-shaped levers 44, 45 is
rigidly fixed to the side of one of the pulleys 205. The pulley 204
is journaled between the arms of a bracket 203 and the pulley 205
is journaled on a shaft 207 which is fixed in the respective side
wall 24, 26. The valve assemblies 64 and 66 extend between the side
walls 24, 26 and communicate the fluid between the opposite
chambers of the cylinder 201 internally within the assemblies 64
and 66 and via external tubes (not shown) which are connected to
the assemblies and the respective chambers. The valve assemblies 64
and 66 function in the same fashion as previously described with
respect to the actuator 21 and thus control the speed with which
the levers 44, 45 reciprocate.
While only two embodiments of the inventions have been illustrated
and described especially adapted for lower limb therapy it will be
apparent that many modifications and variations are possible. For
example, the device may be mounted on other suitable housings.
Moreover other types of Isokinetic control actuators, i.e.,
hydraulic, electro-mechanical, centrifugal compensating brake, etc.
may be used.
It should thus be understood that the foregoing relates to
preferred embodiments of the invention and that they are intended
to cover all changes and modifications of the examples of the
invention herein chosen for the purposes of the disclosure, which
do not constitute departures from the spirit and scope of the
invention.
* * * * *