JP4039171B2 - Suspended cage - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension cage that suspends and holds a suspended device provided on a ceiling.
[0002]
[Prior art]
Conventionally, in the suspended cage KK in which the suspended device XX such as an overhead traveling X-ray tube device is configured to be movable up and down, the suspended device XX is shown in the solid line of FIG. When the suspended device XX is located at the lower end of the up-and-down movement stroke in the imaginary line when located at the upper end portion, FIG. 5 shows the case where the suspended device XX is located at the middle portion of the up-and-down movement stroke, respectively. As shown in the figure, the suspension comprises a string-like suspension means WW such as a wire supported at both ends by a support member (not shown), a fixed pulley a21 provided on a support frame a1 provided on the ceiling, and a movable pulley a22. The suspension portion XX1 at the tip of the suspended device XX is suspended and held by a suspension mechanism in which the means WW is wound between the fixed pulley a21 and the movable pulley a22. On the other hand, the movable pulley a22 is rotatably attached to a rotary arm a3 having one end rotatably fixed to the support frame a1. The movable pulley a22 moves in a substantially horizontal direction in conjunction with the rotary arm a3. On the other hand, the balance spring a4 has one end fixed to the support a1 so as to be rotatable around the axis a40, and is attached to the other end via a spring mounting member a44 having a fixed end a43 of the balance spring a4. The end is connected to the rotary arm a3 via a retainer a41 and a spring connecting part a42. The spring connecting part a42 rotates around the axis a30 of the rotating arm a3 as the suspended device XX moves up and down. The retainer a41 interlocks with the spring connecting portion a42 along the spring mounting member a44, and compresses the spring a4 as the suspended device XX descends. The compressed spring a4 acts on the rotating arm a30 via the retainer a41 and the spring connecting part a42 so as to rotate in the direction in which the suspended device XX is raised. The fixed pulley a21 and the movable pulley a22 are both provided in two pairs on the left and right, and employ a so-called quadruple pulley mechanism.
[0003]
[Problems to be solved by the invention]
However, in such a suspended cage KK, as shown in FIGS. 4 and 5, conventionally, the gravity acting on the balance spring a4 itself is suspended from the rotating arm a3, particularly near the lower end of the moving range. It exerts a torque in the same direction as that exerted by the gravity acting on the device XX. That is, the balance spring a4 used for such a suspended cage KK needs to support not only the gravity acting on the suspended device XX but also the gravity acting on itself by the elastic force. Further, when the angle formed by the balance spring a4 and the rotary arm a3 changes and is set so as to be balanced at an intermediate portion of the movement stroke as shown in FIG. 5, the lower end of the movement stroke shown by the imaginary line in FIG. In the vicinity, the gravity acting on the balance spring a4 acts in a direction in which the suspended device XX is lowered more than in the case shown in FIG. 5, whereas the increase in the elastic force of the balance spring a4 is smaller than this. In the vicinity of the lower end of the movement stroke, the balance is inclined in a direction in which the suspended device XX is further lowered.
[0004]
Further, when configured in this way, the balance spring a4 needs to support the suspended device XX and the gravity and elastic force of the suspended device XX as described above. Such springs are often large and therefore the overall thickness of the suspended cage KK is also large. On the other hand, since the height of the ceiling of the room in which such a suspension cage KK is installed is constant, it moves sufficiently upward even if it is necessary to move the suspended device XX away from the observation target. Failures that cannot be made can occur.
[0005]
The present invention solves the above-described problems, is configured to balance the entire stroke of the movement stroke, and to increase the vertical movement stroke width of the suspended device.
[0006]
[Means for Solving the Problems]
That suspension holder according to the present invention, the suspension means forming a string-like, a fixed pulley having a support provided on the ceiling, other rotating arm mounted via a rotatable shaft at one end to said support It is wound between a movable pulley that is rotatably attached to the end , this suspension means is attached to the suspended device, the suspended device is suspended, and the movable pulley is moved in conjunction with the raising and lowering of the suspended device. the rotary arm is rotated within the range of horizontal and downward vertical direction about the axis, the angle is reduced relative to the lower vertical direction of the rotating arm, said target suspension device with increasing rise, configured to descend with At the same time, one end is fixed to the support so as to be rotatable around a horizontal axis, and a balance spring is attached to the other end via a spring mounting member in which a fixed end of the balance spring is set. Connected between the rotary shaft and the movable pulleys of over arm, the elastic force of the balance spring is always so as to act on the rotary arm so as to reduce the angle to the lower vertical direction of the rotary arm of the object to be suspended equipment be those which by its own weight and the balance of the total operating range of the object to be suspended equipment, torque component acting on the rotating arm of the self-weight of the pre-Symbol balance spring and the rotary arm with the descent of the object to be suspended equipment It is characterized by increasing.
[0007]
If it is comprised in this way, unlike the conventional one, it is comprised so that the said suspended apparatus may rise and fall as the angle with respect to the downward vertical direction of the rotating arm decreases and increases, and the elastic force of the balance spring Always acts on the rotating arm so as to reduce the angle of the rotating arm with respect to the downward vertical direction, while the torque component acting on the rotating arm of the balance spring and the rotating arm with its own weight is lowered to the suspended device. Accordingly, the weight of the balance spring and the rotary arm can be made to cooperate with the elastic force of the balance spring. In this way, even if the torque component acting on the rotating arm of the elastic force of the balance spring decreases, it can be compensated by cooperating with the elastic force of the balance spring and the self-weight balance spring of the rotating arm. Therefore, the elastic force of the balance spring and the gravity acting on the balance spring and the rotary arm itself work together to pull up the suspension part, and can be balanced in the whole stroke. Moreover, since a small spring with a small elastic coefficient can be used, the thickness dimension of such a suspended cage can be reduced, and the stroke of vertical movement of the suspended apparatus can be increased. Further, since a small spring can be used, the manufacturing cost can be reduced and the degree of freedom in design can be improved.
Further, as a more specific configuration of the suspension cage for obtaining the above-described effect, a support frame that is a support provided by hanging from a ceiling, a fixed pulley provided at a predetermined position of the support frame, and one end A rotating arm attached to the support frame so as to be rotatable about an axis and having a moving pulley at the other end, a moving pulley rotatably attached to the other end of the rotating arm, and the rotating arm A retainer connected to a portion between the shaft and the moving pulley via a spring connecting portion, and attached to the support frame via a spring mounting member, and the retainer and the spring in a state where the working end is housed in the retainer. A balance spring connected to the rotating arm via the connecting portion, and a string formed by attaching one end portion to the suspended device to suspend and hold the suspended device and to be wound between the fixed pulley and the movable pulley Shaped suspension The movable pulley approaches the fixed pulley as the suspended device descends, and the rotating arm moves horizontally and vertically downward as the movable pulley approaches the fixed pulley. In this range, the extending direction of the rotary arm rotates about the axis in the direction from the lower vertical direction to the horizontal direction, and the spring mounting member has one end at the support frame. This spring mounting member is provided so as to be rotatable at the center, and the fixed end of the balance spring is set at the opposite end, and when the retainer and the spring connecting portion rotate about the axis of the rotating arm. Is rotated around the shaft in conjunction with the spring connecting portion, and as the suspended device moves downward, the retainer approaches the fixed end of the balance spring, compresses the balance spring, and the elastic spring of the balance spring A force acts on the rotary arm in a direction in which the rotating arm is lifted through the retainer and the spring connecting portion in a direction in which the suspended device is lifted, that is, in a direction in which the extending direction is changed from horizontal to downward in the vertical direction. However, the balance spring is made more parallel to the rotating arm, and the torque component acting on the rotating arm of the balance spring and its own weight with respect to the entire operating range of the suspended device is the suspended device. What is characterized by increasing with the descent of the.
[0008]
In the present invention, the “support provided on the ceiling” is a concept including all structures fixed to the ceiling or provided so as to be able to travel along the ceiling and supporting the suspension cage.
[0009]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
[0010]
The suspension cage K according to the present invention is used for medical purposes as shown in FIG. 1 for a perspective view, FIG. 2 for a side view, and FIG. 3 for a side view. The tube apparatus X is suspended and held, and is provided at a predetermined position of the support frame 1 as a support, a wire W as a string-like suspension means for hanging and holding the X-ray tube apparatus X, and the support frame 1. The first constant pulley 21a, the second constant pulley 21b, and the third constant pulley 21c, the rotary arm 3 having one end rotatably attached to the support frame 1 around the shaft 30, and the rotary arm 3 A movable pulley 22 that is rotatably attached, and a balance spring 4 that is attached to the support frame 1 via a spring attachment member 44 and whose working end is connected to the rotary arm 3 via a retainer 41 and a spring coupling portion 42. It has. In FIG. 2 , a state where the X-ray tube apparatus X is near the upper end of the vertical movement stroke is indicated by a solid line, and a state where the X-ray tube device X is near the lower end is indicated by an imaginary line.
[0011]
The X-ray tube apparatus X is provided with a suspended portion X1 at the upper end thereof, and the suspended portion X1 is suspended and held by the wire W. The X-ray tube apparatus X is attached to the support frame 1 via a cylindrical X-ray tube apparatus attachment X2 configured to be extendable and contractible.
[0012]
The support frame 1 is a frame-shaped member that can travel on a travel rail (not shown) provided on the ceiling, and the X-ray tube device X is attached to an end portion thereof.
[0013]
Both ends of the wire W are supported by suspension means fixing portions 23 provided on the rotary arm 3, and are wound around the movable pulley 22 and the first to third constant pulleys 21a to 21c, respectively. The center is fixed to the suspension part X1 provided at the upper end of the X-ray tube apparatus X.
[0014]
A pair of the first constant pulleys 21a is provided immediately above the X-ray tube apparatus X, and is configured to change the force for moving the X-ray tube apparatus X up and down into a horizontal force. The second constant pulley 21 b is provided at both left and right ends, and the wire W is arranged in parallel with the support frame 1. Three pairs of the third constant pulleys 21c are provided symmetrically, and a fixed pulley shaft 210 provided penetrating inside the support frame 1 is used as a rotation shaft. These first to third constant pulleys 21 a to 21 c have an action of connecting the X-ray tube apparatus X and the movable pulley 22 together with the wire W. In particular, the third constant pulley 21c has a function as a constant pulley in claims.
[0015]
The rotary arm 3 is provided in a pair of left and right, and one end thereof is attached to the support frame 1 via a shaft 30 and two movable pulleys 22 are provided at the other end. Since the wire W is wound between the movable pulley 22 and the third constant pulley 21c so as to be applied once to all of them, the elastic force of the balance spring 4 acting on the movable pulley 22 in this embodiment. This is balanced when the torque component of the weight and the dead weight is one fifth of the gravity acting on the X-ray tube. That is, a so-called five-fold pulley mechanism is employed. In this embodiment, the left and right rotating arms 3 are connected via a connecting rod 32 provided at the end of the movable pulley 22.
[0016]
The movable pulley 22 is rotatably attached to the rotary arm 3 as described above, and moves upward when the X-ray tube device X is lowered, and downward when the X-ray tube device X is raised. Configured to move to. That is, the movable pulley 22 and the rotating arm 3 are moved in conjunction with the X-ray tube apparatus X.
[0017]
One end of the balance spring 4 is provided on the support frame 1 so as to be rotatable about the shaft 40, and the support frame 1 is interposed via a spring mounting member 44 in which the fixed end 43 is set on the opposite end. It is the compression spring attached to. The working end is housed in the retainer 41, and the working end is connected to the rotating arm 3 by connecting the retainer 41 to the rotating arm 3 via a spring coupling portion 42 so as to be rotatable. . The balance spring 4 is attached so that its elastic force always acts on the rotary arm 3 in a direction in which the suspended device X is pulled up to balance the weight of the suspended device. More specifically, as the X-ray tube apparatus X moves up and down, the retainer 41 and the spring connecting portion 42 rotate about the axis of the rotating arm 3, and the spring mounting member 44 is connected to the spring connecting portion 42. The shaft 40 is rotated around the shaft in conjunction with the rotation. At this time, the retainer 41 approaches the fixed end 43 and compresses the balance spring 4 as the X-ray tube apparatus X moves downward. The compressed balance spring 4 acts to rotate the rotary arm 3 in the direction in which the X-ray tube device X is lifted through the retainer 41 and the spring connecting portion 42.
[0018]
Thus, in the present embodiment, the angle formed by the rotary arm 3 connected to the balance spring 4 with respect to the vertical direction is monotonically increased, that is, set to approach the horizontal, and the balance spring 4 and the rotary arm 3 are also set. The torque component acting on the rotating arm 3 with its own weight increases as the suspended device X descends, and the elastic force of the balance spring 4 and its own weight cooperate with the own weight of the rotating arm 3 to cooperate with the X-ray tube. Acting to lift the device X.
[0019]
Specifically, the load of the X-ray tube apparatus X exerts a torque in the direction of pulling up the movable pulley 22 at the tip of the rotary arm 3. On the other hand, both the elastic force and the own weight of the balance spring 4 exert a torque in a direction in which the rotary arm 3 is pulled down and the X-ray tube apparatus X is pulled up.
[0020]
When the X-ray tube apparatus X is lowered, the movable pulley 22 moves upward and the rotating arm 3 becomes more horizontal, so that it acts on the rotating arm 3 of gravity acting on the balance spring 4 and the rotating arm 3 itself. The torque component to be increased. On the other hand, although the balance spring 4 is further compressed and the elastic force itself is increased, the balance spring 4 becomes more parallel to the rotary arm 3, so in this embodiment, the torque component acting on the rotary arm 3 of the elastic force. Conversely, it becomes smaller. These sums are always substantially constant.
[0021]
As described above, the elastic force of the balance spring 4 and the own weight of the balance spring 4 and the own weight of the rotary arm 3 cooperate to pull up the X-ray tube device X. The torque component acting on the balance spring 4 and the torque component acting on the rotating arm 3 due to the weight of the balance spring 4 and the rotating arm 3 complement each other so that they can be balanced in the whole stroke. When the X-ray tube apparatus X is lowered, the rotary arm 3 becomes more horizontal and the angle formed with the vertical direction is increased. Therefore, the weight of the balance spring 4 and the rotary arm 3 is reduced to the X-ray tube. The device X can be effectively used by being suspended. In addition, the balance spring 4 is smaller and has a smaller elastic coefficient than the conventional one configured to support the load of the X-ray tube apparatus X and the balance spring 4 only by the elastic force of the balance spring 4. Therefore, the suspension cage K can be made smaller and the manufacturing cost can be reduced. In addition, since the thickness dimension can be reduced, the moving stroke in the vertical direction of the X-ray tube apparatus X can be increased.
[0022]
In addition, while a pulley mechanism with a quadruple increase is conventionally used, a pulley mechanism with a five-fold increase is used in this embodiment, so that the elastic force of the balance spring 4, the gravity acting on the balance spring 4, and The sum of the components acting as torque on the rotating arm of gravity acting on the rotating arm 3 is balanced by 1/5 of the component acting as torque on the rotating arm of gravity acting on the suspended device X. From this point In addition, it is possible to use a small balance spring 4, and it is possible to reduce the size of the suspension cage K, particularly to reduce the thickness dimension.
[0023]
The present invention is not limited to the embodiments described above.
[0024]
For example, in addition to the X-ray tube apparatus as described in the above-described embodiments, various devices such as a gamma ray source used for radiation therapy can be suspended according to the present invention as long as the device can be moved up and down. It may be used as
[0025]
Moreover, as a suspension means, you may employ | adopt arbitrary things which make a string shape, such as a piano wire, other than the wire described in embodiment mentioned above according to the load of a to-be-suspended apparatus, etc.
[0026]
Furthermore, the number of fixed pulleys and moving pulleys may be set arbitrarily, and the position of the support member may also be set arbitrarily. That is, a pulley mechanism of 6 times or more may be used, or a 4 times more pulley mechanism similar to the conventional one may be used.
[0027]
【The invention's effect】
The present invention is configured such that the suspended device rises and descends as the angle of the rotary arm with respect to the lower vertical direction decreases and increases with respect to the entire operating range of the suspended device, and the elastic force of the balance spring Always acts on the rotating arm so as to decrease the angle of the rotating arm with respect to the vertical direction below, while the torque component acting on the rotating arm of the balance spring and the rotating arm's own weight causes the suspended device to descend. Accordingly, the elastic force of the balance spring, the own weight, and the own weight of the rotating arm can cooperate to raise the suspended device. Therefore, it is possible to realize a suspension cage that is smaller and has a large vertical movement stroke of the suspended device.
[Brief description of the drawings]
FIG. 1 is a perspective view of a suspension cage according to an embodiment of the present invention.
FIG. 2 is a side view of the suspension cage according to the embodiment.
FIG. 3 is a plan view of the suspension cage according to the embodiment.
FIG. 4 is a schematic view showing a conventional suspension cage.
FIG. 5 is a schematic view showing a conventional suspension cage.
[Explanation of symbols]
K ... Suspended cage 1 ... Support 21c ... Third fixed pulley (fixed pulley)
22 ... Dynamic pulley 3 ... Rotating arm 4 ... Balance spring 40 ... (Spring rotation) shaft 43 ... Balance spring fixed end 44 ... Spring mounting member X ... X-ray tube device (suspended device)
W ... Wire (Suspension means)

Claims (2)

A fixed pulley provided on a support provided on the ceiling, and a moving pulley rotatably attached to the other end of a rotary arm having one end rotatably attached to the support via a shaft. The suspension means is attached to the suspended device to suspend and hold the suspended device, and the rotary arm moves in the horizontal and vertical directions along with the movement of the movable pulley in conjunction with the raising and lowering of the suspended device. the range of rotation about said axis, the angle is reduced relative to the lower vertical direction of the rotary arm, wherein the suspension device is raised with increasing, with are configured to be lowered,
One end is fixed to the support so as to be rotatable around a horizontal axis, and a balance spring is attached to the other end via a spring mounting member in which a fixed end of the balance spring is set. The working end of the balance spring is connected to the rotation shaft of the rotary arm. And the elastic force of the balance spring always acts on the rotating arm so as to reduce the angle of the rotating arm with respect to the lower vertical direction so that the weight of the suspended device is balanced. And
The total operating range of the object to be suspended equipment, torque component acting on the rotating arm of the self-weight of the pre-Symbol balance spring and the rotary arm is characterized in that so as to increase with the descent of the object to be suspended equipment Suspended cage. A support frame that is a support body that is suspended from the ceiling, a fixed pulley that is provided at a predetermined position of the support frame, and one end that is rotatably attached to the support frame about an axis and moves to the other end. A rotating arm provided with a pulley, a retainer connected to a portion between the shaft and the moving pulley of the rotating arm via a spring connecting portion, and attached to the support frame via a spring mounting member. A balance spring connected to the rotary arm via the retainer and a spring connecting portion in a state where the end is housed in the retainer, and one end portion is attached to the suspended device to suspend and hold the suspended device and the fixed pulley And a wire as a string-like suspension means wound between the movable pulley and the movable pulley,
As the suspended device descends, the moving pulley approaches the fixed pulley, and the rotating arm moves around the axis within the horizontal and downward vertical range as the moving pulley approaches the fixed pulley. While the extending direction of the rotating arm is configured to rotate in the direction from the lower vertical direction to the horizontal direction,
The spring mounting member has one end rotatably provided around the shaft on the support frame, the fixed end of the balance spring is set on the opposite end, and the retainer and the spring connecting portion are When rotating around the axis of the rotating arm, this spring mounting member rotates around the axis in conjunction with the spring coupling part,
As the suspended device moves downward, the retainer approaches the fixed end of the balance spring and compresses the balance spring, and the elastic force of the balance spring causes the rotary arm to be moved through the retainer and the spring connecting portion. While making the suspension spring act on the rotary arm in the direction in which the suspension device is raised, that is, in the direction in which the extending direction is rotated from the horizontal to the downward vertical direction, the balance spring is made closer to the rotary arm,
The suspension is characterized in that the torque component acting on the rotation spring of the balance spring and the weight of the rotary arm increases with the descent of the suspended device over the entire operating range of the suspended device. Cage .

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