U.S. patent number 3,790,805 [Application Number 05/135,094] was granted by the patent office on 1974-02-05 for mobile x-ray unit.
This patent grant is currently assigned to Picker Corporation. Invention is credited to Anthony J. Foderaro.
United States Patent |
3,790,805 |
Foderaro |
February 5, 1974 |
MOBILE X-RAY UNIT
Abstract
A power driven mobile X-ray unit having greatly improved
maneuverability through the provision of an X-ray source nestable
for transit and a drive control handle which gives the operator the
feel of pushing or pulling the unit during transit. The handle
comprises a horizontally disposed gripping bar, movable
horizontally forwardly and rearwardly of a neutral position. The
handle is biased toward the neutral position where the drive means
is deactivated and serves to break the unit from moving. Increased
pressure on the handle causes the unit to move at a higher speed. A
limit switch is provided to prevent the operation of the power
drive at any other than the slowest speed when the X-ray tube is in
a position other than its storage position. A novel telescoping
mast supports the X-ray tube.
Inventors: |
Foderaro; Anthony J.
(Middleburg Heights, OH) |
Assignee: |
Picker Corporation (Cleveland,
OH)
|
Family
ID: |
22466513 |
Appl.
No.: |
05/135,094 |
Filed: |
April 19, 1971 |
Current U.S.
Class: |
378/198; 378/117;
378/91 |
Current CPC
Class: |
A61B
6/4405 (20130101) |
Current International
Class: |
A61B
6/00 (20060101); G03b 041/16 () |
Field of
Search: |
;250/65R,91,92,52 |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
"Industrial X-Ray Units," General Electric Publication 7A-700, June
15, 1942, pp. 6 and 7.
|
Primary Examiner: Lawrence; James W.
Assistant Examiner: Church; C. E.
Attorney, Agent or Firm: Watts, Hoffmann, Fisher &
Heinke Co.
Claims
1. A mobile X-ray unit comprising:
a. a base and frame structure;
b. a mast mounted on said structure;
c. a source of X-rays mounte on said mast and movable relative to
said structure;
d. drive means for selectively moving the unit in forward and
rearward directions including;
i. floor wheels supporting said structure;
ii. a source of rotary motion coupled to selected ones of said
wheels and operable to rotate said selected wheels selectively in
forward and reverse directions of rotation;
e. control means for selectively actuating said source of rotary
motion to drive said selected wheels in forward and reverse
directions of rotation, including:
i. a gripping bar disposed generally horizontally and transverse to
a path of movement of the unit, accessible from rearwardly of said
structure, and movable relative to said structure forwardly and
rearwardly of a neutral position;
ii. biasing means biasing said gripping bar into said neutral
position;
iii. position responsive means coupled to said source of rotary
motion and responsive to forward and rearward movements of said
gripping bar to actuate said source of rotary motion to rotate said
selected wheels respectively in forward and rearward directions of
rotation at a first speed when said gripping bar is moved a first
distance from said neutral position, and at a second speed greater
than said first speed when said gripping bar is moved a second
distance from said nutral position greater than said first
distance;
f. said mast and said structure cooperating to define a protective
nested transport position for said source of X-rays; and
g. an electrical switch means responsive to the positioning of said
source of X-rays relative to the nested position to prevent the
operation of said drive means at any speed other than its slowest
speed when said source of
2. The mobile X-ray unit of claim 1 wherein said telescopic mast
comprises:
a. a base section pivotally mounted on said structure;
b. a movable section movably mounted on said base section for
translation relative to said base section;
c. a carriage movably mounted on said movable section for
translation relative to said base section; and,
d. cable and pulley means interconnecting said base section, said
movable section and said carriage such that movement of said
carriage relative to said base section is operative to effect
concurrent movement of said
3. The mobile X-ray unit of claim 2 wherein said movable section
telescopes over said base section and said carriage telescopes over
said movable
4. The mobile X-ray unit of claim 3 wherein said movable section is
shorter than said base section and is movable between a lowermost
position surrounding the lower portion of said base section to an
uppermost position wherein a portion of said movable section
extends above said base
5. A mobile X-ray unit comprising:
a. a base assembly;
b. floor wheels supporting the base assembly for movement over a
floor;
c. a mast assembly mounted on the base assembly for relative
movement, the mast assembly including an X-ray source mounted on a
mast;
d. a multiple speed and direction motor means mounted on the base
assembly and drivingly connected to at least one of the floor
wheels for selectively driving the one wheel selectively at
relatively low and relatively high speeds;
e. said mast assembly including operative and storage
positions;
f. disabling means carried by one of the assemblies and actuatable
by the other assembly when the mast assembly is in the storage
position;
g. said disabling means disabling high speed motor means operation
when the mast assembly is in its operative position and enabling
high speed motor means operation when the mast assembly is in its
storage position;
h. a control handle accessible from rearwardly of said base
assembly and movable in forward and reverse directions relative to
said base assembly;
i. biasing means biasing said control handle in a neutral
position;
j. position responsive means coupled to said motor means and
responsive to forward and reverse movements of said control handle
to actuate said motor means respectively in forward and reverse
directions; and,
k. whereby forward movement of the mobile X-ray unit is effected by
pushing on said control handle and rearward movement of the unit is
effected by
6. The mobile X-ray unit of claim 5 wherein said position
responsive means is operative to actuate said motor means at a
first speed when said control handle is moved a first distance from
said neutral position, and is operative to actuate said motor means
at a second speed greater than said first speed when said control
handle is moved a second distance from
7. The mobile X-ray unit of claim 6 wherein said biasing means is
operative to exert an increased biasing force toward said neutral
position the farther said control handle is moved from said neutral
position, whereby an operator must exert a greater force on said
control handle to actuate
8. A mobile X-ray unit comprising:
a. a base and frame structure;
b. floor wheels supporting the structure for movement over a
floor;
c. a mast mounted on the structure;
d. an X-ray source mounted on said mast and movable relative to the
structure, said mast and said structure cooperating to define a
protective transport position for said source of X-rays;
e. a control handle movably mounted rearwardly on said structure
and disposed generally horizontally and transverse to a path of
unit movement;
f. biasing means between the handle and structure and normally
biasing said handle into a neutral position;
g. multiple speed and direction motor means mounted on the
structure and drivingly connected to at least one of the wheels for
selectively driving the wheel in forward and reverse
directions;
h. a motor speed control device electrically connected to the motor
and operatively connected to the handle when the handle is moved
out of its neutral position;
i. the speed control device including low and high speed
components;
j. said handle having low and high speed positions;
k. said handle being in the low speed position when pushed
forwardly form its neutral position a certain distance and being in
its high speed position when pushed forwardly further than said
given distance;
l. said handle actuating the low speed component when in the low
speed position and the high speed component when in the high speed
position whereby the speed of forward movement of the unit is a
function of the movement of the handle from its neutral position;
and,
m. safety means coupled responsive to the positioning of said
source to restrict the operation of said motor means to low speed
operation when
9. A mobile X-ray unit comprising:
a. a base and frame structure;
b. floor wheels supporting the structure for movement over a
floor;
c. a mast mounted on the structure;
d. an X-ray source mounted on said mast and movable relative to the
structure, said mast and said structure cooperate to define a
protective transport position for said source of X-rays;
e. a control handle movably mounted rearwardly on said structure
and disposed generally horizontally and transverse to a path of
unit movement;
f. biasing means between the handle and structure and normally
biasing said handle into a neutral position;
g. multiple speed and direction motor means mounted on the
structure and drivingly connected to at least one of the wheels for
selectively driving the wheel in forward and reverse
directions;
h. a motor speed control device electrically connected to the motor
and operatively connected to the handle when the handle is moved
out of its neutral position;
i. the speed control device including low and high speed
components;
j. said handle having low and high speed positions;
k. said handle being in the low speed position when pushed
forwardly from its neutral position with a certain force and being
in its high speed position when pushed forwardly with a force
greater than said given force;
l. said handle actuating the low speed component when in the low
speed position and the high speed component when in the high speed
position whereby the speed of forward movement of the unit is a
function of the force applied to the handle; and,
m. safety means coupled with the motor means and responsive to the
positioning of said source to restrict the operation of said motor
means to low speed operation when said source is out of its
protective nested
10. A mobile X-ray unit comprising:
a. a base assembly;
b. floor wheels supporting the base assembly for movement over a
floor;
c. a mast assembly mounted on the base assembly for relative
movement, the mast assembly including an X-ray source mounted on a
mast;
d. a multiple speed and direction motor means mounted on the base
assembly and drivingly connected to at least one of the floor
wheels for driving the one wheel selectively at relatively low and
relatively high speeds;
e. said mast assembly having operative and storage positions;
f. a control handle movable to different positions relative to the
base assembly to selectively operate the motor means at said low
and high speeds; and,
g. safety means carried by one of the assemblies and actuatable by
the other assembly when the mast assembly is in the storage
position disabling high speed operation when the mast assembly is
in its operative position and enabling high speed operation when
the mast assembly is in its storage
11. A mobile X-ray unit comprising:
a. a base assembly;
b. floor wheels supporting the base assembly for movement over a
floor;
c. a mast assembly mounted on the base assembly for relative
movement, the mast assembly including an X-ray source mounted on a
mast;
d. a multiple speed and direction motor means mounted on the base
assembly and drivingly connected to at least one of the floor
wheels for selectively driving the one wheel selectively at
relatively low and relatively high speeds;
e. said mast assembly including operative and storage
positions;
f. disabling means carried by one of the assemblies and actuatable
by the other assembly when the mast assembly is in the storage
position; and,
g. said disabling means disabling high speed motor means operation
when the mast assembly is in its operative position and enabling
high speed motor
12. The mobile X-ray unit of claim 11 wherein said disabling means
comprises a limit switch carried by said base assembly and actuated
by said mast assembly when said source of X-rays is in said storage
position.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a mobile X-ray unit, and
more particularly to a power driven mobile X-ray unit having a
reversible multiple speed drive.
2. Prior Art
Mobile X-ray units which can be taken into a patient's hospital
room for radiographic procedures are increasingly in demand. Such
mobile units obviate the need to move the patient to a remote X-ray
room for relatively simple procedures and thus serve both to
facilitate patient convenience and comfort and to avoid the expense
of moving the patient.
As the demand for and usage of mobile units has increased, larger
and larger units have evolved. To a certain extent, all mobile
X-ray units are awkward to move, especially the larger units. The
problem of maneuverability is compounded by the need for
cantilevering the X-ray tube to extend substantially forward of the
unit in order that it may be positioned over, beneath or to one
side of a bed-ridden patient.
Due to the weight of the mobile units and the fact that many X-ray
technicians are women, these units are often provided with power
drive systems. While power drive systems have therefore been used
in mobile X-ray units, the control systems provided with such units
have not given the operator the feel of "pushing" or "pulling" the
unit. Prior power drive systems have also failed to provide a
simple, inexpensive and reliable power control system.
In addition, most power driven mobile units are difficult to
maneuver through doorways and around obstacles. In many instances
the range of X-ray tube movement available for diagnostic studies
has been sacrificed to improve maneuverability and to provide low
profiles which will pass through doorways.
SUMMARY OF THE INVENTION
The present invention provides a mobile X-ray unit with a variable
speed, reversible drive having an improved and simplified speed
control and an X-ray tube movable to a protected nested storage
position for transit. The invention also provides a novel
telescoping mast which permits a large range of vertical X-ray tube
movement while also providing a low storage position profile for
passage through doorways or the like.
In accordance with one feature of the present invention, a speed
control is provided which includes a substantially horizontally
disposed gripping bar movable in either the forward or reverse
directions according to the direction in which it is desired to
move the unit. The gripping bar is biased to a neutral position by
a biasing means which exerts an increased biasing force the farther
the bar is moved from the neutral position. Movement of the unit at
a higher speed requires the exertion of more force on the gripping
bar, whereby the operator has the feel of pushing or pulling the
unit.
In accordance with another feature of the present invention, the
X-ray tube is supported on a novel rotatably mounted mast which
telescopes to a minimal height for transit and permits the tube to
be pivoted from its forwardly extending operative position to a
rearwardly extending protective nested position for transit.
In accordance with still another feature of the present invention,
a safety means may be provided which requires that the X-ray tube
be moved to the protective nested position before the unit can be
moved at any other than its slowest speed.
Accordingly, it is the principal object of this invention to
provide a mobile X-ray unit which is simple and easy to operate and
which affords a maximum of protection to the X-ray tube during
transit.
Other objects and a fuller understanding of the invention may be
had by referrring to the following description and claims in
conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the mobile X-ray unit with the
X-ray tube shown in a forwardly extending operative position above
a patient;
FIG. 2 is an elevational view of the mobile X-ray unit with the
X-ray tube shown by solid lines in the operative position, and by
phantom lines in the protective nested position;
FIG. 3 is an enlarged plan view partially in cross section of one
end portion of the horizontally disposed gripping bar which
controls the movement of the unit;
FIG. 4 is a sectional elevational view showing the gripping bar end
portion of FIG. 3;
FIG. 5 is a schematic motion diagram depicting the movement of the
horizontal gripping bar about its neutral position;
FIG. 6 is a schematic diagram illustrating the control arrangement
which is responsive to the movement of the gripping bar to drive
the unit;
FIG. 7 is an enlarged sectional plan view of the other end portion
of the horizontally disposed gripping bar;
FIG. 8 is a sectional view as seen from the plane indicated by the
line 8--8 in FIG. 7;
FIG. 9 is a schematic illustration of a cable and pulley system
interconnecting sections of the telescopic mast, the mast being
shown in it uppermost extended position;
FIG. 10 is a schematic illustration similar to FIG. 9 with the mast
shown retracted to the nested or storage height; and
FIG. 11 is a schematic illustration similar to FIGS. 9 and 10 with
the mast shown retracted to its lowermost position.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, a mobile X-ray unit is indicated generally at
10. The mobile unit 10 includes a base indicated generally by the
numeral 11. A source of X-rays in the form of an X-ray tube
assembly 12 is provided. The tube assembly 12 is supported above
the base 11 by a telescopic mast 13.
The base 11 is supported by a pair of centrally disposed drive
wheels 14, a pair of forwardly disposed support wheels 15, and a
rearwardly disposed balance wheel 16. A source of rotary motion
comprising a reversible battery operated motor 17, shown in dotted
lines in FIG. 2, is connected to the drive wheels 14 to selectively
move the unit 10 in forward or reverse directions.
The telescopic mast 13 includes a rotatably mounted, vertically
extending base section 20 and a movable mast section 21 which is
telescoped over the base. The mast section 21 is adapted to move
vertically relative to the base section 20. A track 22 is formed
along the forward side of the mast section 21. A horizontally
extending X-ray tube assembly carriage 23 is mounted on the track
22 for vertical movement relative to the mast section 21. The
movable mast section 21 and the carriage 23 are provided with a
counterbalance (not shown) to facilitate their movement. A
telescopic column composed of sections 24, 25, 26 connects the tube
assembly 12 to the carriage 23. A suitable telescopic column is
described in U.S. Pat. No. RE 24,982 to R. C. Schiring entitled
"Tubular Telescopic Column."
As was previously mentioned, the vertical base section 20 is
pivotally mounted relative to the base 11. By this arrangement, the
X-ray tube assembly may be moved from the operative position shown
by solid lines in FIG. 2 to the protected nested or storage
position shown in phantom in FIG. 2. When the X-ray tube assembly
is moved to the nested position, it is afforded an increased degree
of protection for transit. Moreover, movement of the X-ray tube
assembly to the nested position substantially decreases the
effective length dimension of the unit and concentrates the weight
by moving the center of gravity rearwardly making the unit easier
to maneuver. In addition, when the X-ray tube is in its nested or
storage position, the telescopic mast is partially collapsed to a
height which will pass through doorways conveniently.
A handle assembly 30 extends rearwardly from the base 11 at a
convenient height to be grasped by an operator. The handle assembly
30 includes a substantially horizontally disposed gripping bar 31
extending between a pair of side bar supports 32, 33. As will be
explained in greater detail, the gripping bar 33 is movable
forwardly and rearwardly to control the movement of the unit
10.
A brake handle 35 is provided forwardly of the gripping bar 33
between the bar and the base 11. The brake handle 35 extends
downwardly, as shown in dotted lines in FIG. 2, and connects to
pivotally mounted levers 36. The levers 36 are pivoted about an
axis 37. A wheel engaging rod 38 is supported from the levers 36 by
means of linkages 39. A biasing means (not shown) biases the rod 38
into engagement with the drive wheels 14. This biasing is overcome
by rearwardly moving the brake handle 35. By this arrangement, a
"dead man" brake is provided which is normally effective to brake
the unit 10 from movement, but which may be released by holding the
brake handle 35 rearwardly.
Two console control panel surfaces 40, 41 are disposed forwardly of
the gripping bar 31 and the brake handle 35. Suitable controls for
the operation of the X-ray source 12 are positioned on the console
surfaces 40, 41.
The horizontally disposed gripping bar 31 is pivotally mounted at
one end relative to the side bar support, 32. As is seen in FIGS. 3
and 4, one end of the gripping bar 31 has a threaded aperture 51.
An eye-bolt 52 is threaded into the aperture 51. The eye 53 of the
eye bolt 52 journals a pivot pin 54. The pivot pin 54, is, in turn,
journaled and supported by a U-shaped bracket 55 carried by the
side bar support 32.
The movement of the gripping bar 31 is shown schematically in FIG.
5. The neutral position of the bar is illustrated by a dashed line
60. Slow-forward and fast-forward positions are illustrated
respectively by the dashed lines 61, 62. Slow-reverse and
fast-reverse positions are illustrated by the dashed lines 63,
64.
A control mechanism 70 which is incorporated in the side bar 33 is
shown schematically in FIG. 6. The control mechanism 70 comprises
limit switches 71, 72, 73, 74 which correspond respectively to the
mentioned slow-forward, fast-forward, slow-reverse and fast-reverse
positions 61, 62, 63, 64. The switches 71, 72, 73, 74 are connected
through suitable circuitry (not shown) to the reversible motor 17
and serve to control the direction and speed of rotation of the
motor.
The details of the control mechanism 70 are more clearly shown in
FIGS. 7 and 8. A flanged end bushing 80 is pressed onto the
gripping bar 31. A pair of spaced plates 81, 82 are rigidly
connecting to the flanged end bushing 80. An elongate bar 83 is
carried between the spaced plates 81, 82. The bar 83 extends
transversely of the plates 81 and 82 intermediate their ends.
A mounting bracket 84 is secured to the side bar 33. The switches
71, 72, 73, 74 are secured within a U-shaped channel formed in the
mounting bracket 84. Biasing means in the form of a pair of
compression springs 85, 86 engage opposite sides of the plates 81,
82 and the mounting bracket 84. A pair of circular channel segments
87, 88 are secured to the mounting bracket 84 and serve to maintain
the springs 85, 86 in their operating positions with respect to the
bracket 84. The elongate bar 83 projects into the springs 85, 86 to
hold them in position.
The plates 81, 82 have enlarged outer end portions 89, 90,
respectively, which serve to selectively actuate the switches 71,
72, 73, 74 depending on the position of the gripping bar 31. When
the gripping bar is in the neutral position represented by the
dashed line 60 of FIG. 5, none of the switches 71, 72, 73, 74 are
actuated. As the gripping bar 31 is moved to the slow-forward
position, the enlarged end portion 89 engages and actuates the
limit switch 71, causing the motor 17 to be driven at a
slow-forward speed. When the bar 31 is moved to the fast-forward
postion, the enlarged end portion 90 engages and actuates the limit
switch 72, causing the motor to be driven at fast-forward speed.
The switches 73, 74 similarly coact with the enlarged ends 89, 90
to initiate slow-reverse and fast-reverse speeds.
In accordance with one important feature of the present invention,
the control mechanism 70 affords the operator the feel of pushing
or pulling the unit. This "feel" of control is provided by the
combination of the increased force needed to overcome the action of
the springs 85, 86 in moving the gripping bar 31, and the
corresponding increased speed of movement as is occasioned by
actuation of the switches 71, 72, 73 and 74 respectively.
An automatic auxiliary braking means may also be actuated by moving
the handle gripping bar 31. By way of example, suitable worm gear
drive components (not shown) may be incorporated in the drive train
of the mobile unit such that when the drive motor 17 is
de-energized by moving the handle gripping bar 31 to the neutral
position, the drive train itself serves to brake the unit.
In order to prevent the operation of the unit 10 at high speed
while the X-ray tube assembly 12 is in its forwardly extending
position, a safety means may be provided to disable the operation
of the high speed switches 72, 74 when the X-ray source is moved
from the protective nested position. In this regard, a U-shaped
rest 91 is provided atop the control console 41 as shown in FIGS. 1
and 2. A limit switch 92 projects into the U-shaped channel of the
rest 91. When the X-ray tube assembly 12 is in the protective
nested position, the limit switch 92 is engaged by the horizontally
extending section 24. Appropriate circuitry, not shown, may be
interconnected with the limit switches 72, 74, 92 to disable the
operation of the switches 72, 74 when the X-ray source is moved
from the nested storage position.
Referring to FIGS. 9-11, the structural arrangement of the
telescopic mast 13 is shown schematically in greater detail. The
mast section 21 is provided with a pair of pulleys 95, 96 adjacent
its upper and lower ends, respectively. A pair of cables 97, 98 are
reeved over the pulleys 95, 96 respectively. Each of the cables 97,
98 connects at one end with the mast base section 20 at a point 99.
The other ends of the cables 97, 98 connect with the tube assembly
carriage 23 at a point 100.
By this arrangement, when the carriage 23 is moved to its uppermost
position, as shown in FIG. 9, a portion of the movable mast section
21 extends above the mast base section 20 to support the carriage
23. When the carriage 23 is moved to the storage or nested position
height, as shown in FIG. 10, the upper end of the movable mast
section 21 is lowered to substantially align with the upper end of
the mast base section 20. When the carriage 23 is moved to its
lowermost position, as shown in FIG. 11, the movable mast section
21 is also lowered to support the carriage 23. Hence, as will be
apparent, the mast structure 13 provides a strong, rigid support
for the X-ray tube which is capable of telescoping to a minimal
height to facilitate transit of the unit 10.
Although the foregoing description is necessarily of a detailed
character, in order that the invention may be set forth, it is to
be understood that the specific terminology is not intended to be
restrictive or confining, and that various rearrangements of parts
and modifications of detail may be resorted to without departing
from the scope or spirit of the invention as herein claimed.
* * * * *