Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Plural reciprocating or oscillating motors
Reexamination Certificate
2001-01-16
2002-01-29
Dang, Khanh (Department: 2837)
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Plural reciprocating or oscillating motors
C053S115000, C180S411000
Reexamination Certificate
active
06342767
ABSTRACT:
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to a mobile type X-ray apparatus, and more particularly, to an X-ray apparatus which includes a power driving type truck moving forward or backward in response to a force of an operation handle.
FIGS.
3
(
a
) through
3
(
c
) show a conventional mobile type X-ray apparatus or X-ray photographing apparatus with a cordless inverter system for a circuit examination by a doctor. FIG.
3
(
a
) shows a front view; FIG.
3
(
b
) shows a side view; and FIG.
3
(
c
) shows a plan view thereof. The X-ray photographing apparatus includes an X-ray tube
17
; an arm
13
for supporting the X-ray tube
17
; a column
14
freely rotatable on a truck or main body
1
; and an ascending and descending section, in which the arm
13
moves vertically or up and down along the column
14
. The truck
1
is provided with freely pivotable front wheels
11
and rear wheels
12
incapable of steering. The truck
1
also includes a controller, and is moved forward or backward by driving motors
18
by operation of an operation handle
3
forwardly or backwardly, which is provided at handle supporting bases
2
attached to the truck
1
.
The arm
13
, which includes a supporting mechanism for the X-ray tube
17
and a rotating mechanism therefor, and extends or retracts in a horizontal direction, is designed to move vertically along the column
14
smoothly so as to be balanced. In the apparatus, a collimator (X-ray radiation port) of the X-ray tube
17
is directed to portions of a subject to be photographed, i.e. a person to be examined, from all the directions in all spatial positions.
Since the weight of the movable type X-ray photographing apparatus may become more than 450 kg, it is extremely difficult to move the truck without a help of the power. Generally, a pair of the rear wheels
12
, which are fixed not to change directions, is provided at a rear portion of the truck
1
, and a front portion of the truck
1
is supported by a pair of casters, that is, freely pivotable from wheels
11
. The rear wheels
12
are generally driven by the driving motors
18
attached to the truck.
The truck
1
includes an internal power supply with a main circuit of 100 to 120 V and 60 Hz, which is formed of a battery and an inverter, and the truck
1
also includes a high-voltage transformer and an inverter control device. In many cases, there is used an apparatus of a one-touch system, wherein a control circuit thereof is systematized and a photographing operation is automatically programmed.
Also, the truck
1
is designed to have rubber tires such that the truck
1
can freely enter or leave a patient's room, an operating room, and an elevator, and the truck
1
is further provided with a brake system, a cassette box, and accessories.
It is important that the movable X-ray photographing apparatus is small, light-weighted, and excellent in a moving operation ability as a mobile type apparatus, and the movable X-ray photographing apparatus is easily moved to a bedroom, an operating room, a children room or a pediatric room, an X-ray room, an infant room or the like in a hospital, and conveniently used for an X-ray photographing or radiography at a working site, that is, the location where the apparatus is moved.
FIG. 4
shows a diagram of a control system of the conventional mobile type X-ray apparatus. The truck or frame
1
is shown at an upper side in
FIG. 4
, and a left rear wheel
12
a
and a right rear wheel
12
b
are respectively driven by a left driving motor
18
a
and a right driving motor
18
b
. The left driving motor
18
a
and the right driving motor
18
b
are individually controlled by a control board
19
. In the control board
19
, control signals are supplied from a corresponding left side sensor signal processing circuit and a corresponding right side sensor signal processing circuit. These two electronic circuits adjust signals, which are issued from a left advancing pressure sensor
6
af
, a left retreating pressure sensor
6
ab
, a right advancing pressure sensor
6
bf
, and a right retreating pressure sensor
6
bb
due to corresponding forces, to signals appropriate for applying to the Left driving motor
18
a
and right driving motor
18
b
. T hen, rotational speeds from the left driving motor
18
a
and the right driving motor
18
b
are respectively detected by a left pulse encoder
19
a
and a right pulse encoder
19
b
, and signals thereof are fed back to the control board
19
, so that the control is carried out to have appropriate driving speeds.
In this electrically powered mobile type X-ray apparatus, a power from an output shaft of a rotor in the driving motor
18
is transmitted to the rear wheel
12
through a decelerating mechanism. As the decelerating mechanism, there are a mechanism wherein a planetary gear type decelerator is embedded in the driving motor
18
, and a mechanism wherein a planetary gear decelerating mechanism is built inside the rear wheel
12
.
FIG. 5
shows a planetary gear mechanism. The planetary gear mechanism is a mechanism such that in a pair of gears engaging each other (sun gear
4
and planetary gear
5
), the two gears respectively rotate on their own axes, and at the same time, one of the gears (planetary gear
5
) revolves around the axis of the other gear (sun gear
4
). The gear, which not only rotates on its own axis but also revolves at the revolving axis, constitutes the planetary gear
5
; the gear, wherein a position of the axis thereof does not change, constitutes the sun gear
4
; and a member for supporting the planetary gear
5
constitutes a carrier
8
. One of an internal gear
7
, the sun gear
4
and the carrier
8
, which are provided coaxially, is fixed, and the other two are used as input and output axes to have functions of deceleration, acceleration, and reversing.
The conventional mobile type X-ray apparatus is structured as described above. However, in the apparatus, wherein the planetary gear type decelerator is embedded as the decelerator in the driving motor
18
, in order to transmit the power from the output shaft of the rotor inside the driving motor
18
to the rear wheel
12
, according to the structure thereof, a gear sound of meshing the gears is generated, resulting in a problem in case the apparatus is moving in a quiet place inside the hospital.
Also, in the apparatus in which the planetary gear type decelerator is embedded, since a backlash is large, an operator can not control the apparatus desirably, resulting in a problem that a positioning of the apparatus at a bed side in a narrow patient's room is difficult.
On the other hand, in case the decelerating mechanism is built in the rear wheel
12
, it is necessary to transmit the power by a belt between the driving motor
18
and the rear wheel
12
, so that an occupied volume of the driving section is increased.
The present invention has been made in view of the foregoing, and an object of the invention is to provide a mobile type X-ray apparatus, which includes a compact decelerating mechanism and can be moved in a quiet condition, that it, in the condition that the gear sound of meshing the gears is not generated.
Another object of the invention is to provide a mobile type X-ray apparatus as described above, which can be easily operated by an operator, in other word, which has no difficulty in operation due to the backlash as in the conventional apparatus.
Further objects and advantages of the invention will be apparent from the following description of the invention.
SUMMARY OF THE INVENTION
To achieve the above objects, the present invention provides a mobile type X-ray apparatus, which comprises a pair of right and left driving motors; a pair of cyclo-decelerating mechanisms respectively built in the driving motors; and a pair of driving wheels respectively attached to the cyclo-decelerating mechanisms. The driving wheels are individually driven by the respective motors through the respective cyclo-decelerating mechanisms in response to an operation power
Kadowaki Toshio
Takahama Kimihiro
Dang Khanh
Kanesaka & Takeuchi
Shimadzu Corporation
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