JP6330701B2 - X-ray examination table and stopper mechanism for X-ray examination table - Google Patents

Description

  The present invention relates to an X-ray examination table and a stopper mechanism used for the X-ray examination table.

  The examination table for X-ray imaging is used for the purpose of placing the subject when imaging the subject in an X-ray imaging apparatus, for example. Such an X-ray examination table includes a top plate on which a subject is placed. The top plate is movable in the horizontal direction in order to perform a so-called floating operation (see Patent Document 1). This movement of the top plate is executed by the action of a moving mechanism that moves the top plate in a direction parallel to the surface of the top plate with respect to the support portion. The end of the top plate movement stroke is regulated by a stopper mechanism.

  As such a stopper mechanism, conventionally, a stopper composed of a rigid body such as metal or an elastic body such as rubber has been arranged at the end of the movement stroke of the top plate. When the portion comes into contact with the stopper, the movement of the top plate is restricted at that position.

Japanese Patent Laying-Open No. 2005-152089

  When a rigid body such as a metal is used as the stopper, the impact is great when the top plate and the stopper come into contact with each other. Further, when an elastic body such as rubber is used as the stopper, the rebound after the top plate and the stopper come into contact with each other is large. In any of these cases, the subject placed on the top board is uncomfortable.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stopper mechanism for an X-ray examination table that can smoothly stop the top plate at the end of the moving stroke.

  According to the first aspect of the present invention, there is provided a top plate for placing a subject, a mechanical plate for supporting the top plate so as to be movable in a direction parallel to the surface thereof, and for limiting a stroke of the top plate. A support portion having an end limit; a telescopic buffer member disposed between the mechanical end limit and the top plate; and the top plate and the mechanical member in a portion where the buffer member is interposed When the distance between the end limits is not more than a predetermined distance, the displacement in the extension direction of the buffer member is limited, and when the distance between the top plate and the mechanical end limit is not less than a predetermined distance, And an extension restricting means for releasing the restriction on the displacement of the buffer member in the extension direction.

  The invention according to claim 2 is characterized in that the predetermined distance when the restriction on the displacement of the buffer member in the extending direction is released is not less than the maximum length of the buffer member.

  The invention according to claim 3 is characterized in that one end of the buffer member is fixed to the mechanical end limit or the top plate.

The invention according to claim 4 is characterized in that the extension limiting means includes a pinion that can rotate only in one direction,
A rack in which the pinion meshes, and a switching mechanism that switches whether the pinion and the rack are meshed, and the switching mechanism includes the top plate and the mechanical end in a portion where the buffer member is interposed The pinion is meshed with the rack when a distance between the limits is equal to or less than a predetermined distance.

  According to a fifth aspect of the present invention, there is provided a stopper member having a contact surface capable of contacting with a contact portion that moves together with the top plate, and a rack formed in a direction intersecting the contact surface, and the stopper member. And a pinion that can mesh with the rack, and a pinion that is connected to the pinion via a one-way clutch, and swings about a support shaft to thereby remove the pinion. A lever that moves between a meshing position that meshes with the rack, and a separation position that is separated from the rack, and the contact part and the lever are disposed so as to be able to contact, and with the movement of the top plate And a cam for swinging the lever so that the pinion moves from the distant position to the meshing position when it abuts on the abutting portion.

  According to the first to fifth aspects of the invention, the top plate can be gradually decelerated by the action of the urging member at the end of the top plate movement stroke. For this reason, the top plate can be smoothly stopped at the end of the movement stroke.

1 is a perspective view showing an X-ray imaging examination table 100 according to the present invention together with an X-ray fluoroscopic imaging apparatus. It is the cross-sectional schematic diagram which looked at the examination table 100 for X-ray imaging which concerns on this invention from the front. It is the cross-sectional schematic diagram which looked at the examination table 100 for X-ray imaging which concerns on this invention from the side surface. 3 is a schematic view of a cross roller guide 16. FIG. It is explanatory drawing which shows the structure of the stopper mechanism 10, and its operation | movement.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an X-ray imaging examination table 100 according to the present invention together with an X-ray fluoroscopic imaging apparatus.

  The X-ray fluoroscopic apparatus used with the examination table 100 for X-ray imaging according to the present invention is irradiated with an X-ray irradiating unit 31 composed of an X-ray tube and a collimator for irradiating X-rays, and an X-ray irradiating unit 31 A flat panel detector (FPD) 32 as an X-ray detector for detecting X-rays passing through a subject lying on the examination table 100 for X-ray imaging according to the present invention, and these X-ray irradiation units 31 and A C-type arm 33 for supporting the flat panel detector 32, a support member 34 for slidably supporting the C-type arm 33, a turning portion 35 for turning the support member 34, and the turning portion 35 with respect to the floor surface And a support member 36 that supports in a standing state.

  An arcuate guide portion 37 is formed on the C-shaped arm 33, and the support member 34 slidably supports the C-shaped arm 33 by engaging with the guide portion 37. The C-shaped arm 33 is configured so that the X-ray irradiating unit 31 and the flat panel detector 32 have the same X-ray axis from the focal point of the X-ray tube to the flat panel detector 32 as the diameter of the arc forming the guide unit 37. We support in state to do. Further, the turning unit 35 turns the support member 34 around the axis orthogonal to the X-ray axis extending from the focal point of the X-ray tube to the flat panel detector 32 together with the C-shaped arm 33 and the like.

  In the X-ray fluoroscopic imaging apparatus having such a configuration, it is possible to perform fluoroscopy or imaging from an arbitrary direction on the subject by sliding and turning the C-shaped arm 33. Then, an X-ray image based on the X-rays passing through the subject and detected by the flat panel detector 32 is displayed on a display unit (not shown).

  2 is a schematic cross-sectional view of the X-ray imaging examination table 100 according to the present invention as viewed from the front, and FIG. 3 is a schematic cross-sectional view of the X-ray imaging screening table 100 according to the present invention as viewed from the side. is there.

  The X-ray examination table 100 according to the present invention includes a support table 17, a frame 18, and a top plate 19. The support base 17 and the frame 18 constitute a support portion according to the present invention that supports the top plate 19 so as to be horizontally movable. The top plate 19 is movable in the Y direction (the left-right direction in FIG. 2 and the direction perpendicular to the paper surface in FIG. 3), which is also called the longitudinal direction, by the action of the pair of cross roller guides 16 shown in FIG. ing. The end of the movement stroke of the top plate 19 in the Y direction is regulated by the stopper mechanism 10 disposed between the top plate 19 and the frame 18. As shown in FIG. 2, the stopper mechanism 10 disposed between the top plate 19 and the frame 18 has an end portion of the movement stroke of the top plate 19 in the right direction in FIG. In order to regulate the end portion, a pair is provided between the top plate 19 and the frame 18.

  On the other hand, the frame 18 can move in the X direction (also referred to as the short side direction is the direction perpendicular to the paper surface in FIG. 2 and the left and right direction in FIG. 3) by the action of the pair of cross roller guides 16 shown in FIG. It has become. The end of the movement stroke in the X direction in the direction of the top plate 19 that moves together with the frame 18 is regulated by the stopper mechanism 10 disposed between the frame 18 and the support base 17. As shown in FIG. 3, the stopper mechanism 10 disposed between the frame 18 and the support base 17 includes an end of the movement stroke of the frame 18 in the right direction and an end of the movement stroke to the left in FIG. In order to regulate the portion, a pair is provided between the frame 18 and the support base 17.

  FIG. 4 is a schematic view of the cross roller guide 16.

  The cross roller guide 16 has a configuration in which a plurality of rollers 23 and 24 that are orthogonal to each other are alternately arranged between a pair of rails 21 and 22 in which V grooves are formed. According to the cross roller guide 16, the pair of rails 21 and 22 can be translated by a fixed distance in the axial direction thereof. Therefore, the top plate 19 can reciprocate in one direction with respect to the frame 18 and the frame 18 with respect to the support base 17, respectively.

  FIG. 5 is an explanatory diagram showing the configuration and operation of the stopper mechanism 10 shown in FIGS. 2 and 3. In this figure, the stopper mechanism 10 disposed on the right side between the top plate 19 and the frame 18 shown in FIG. 2 is shown, and the shapes of the top plate 19 and the frame 18 are schematically expressed in a rectangular shape. ing. The stopper mechanism 10 disposed on the left side between the top plate 19 and the frame 18 has a configuration that is symmetrical to the stopper mechanism 10 shown in FIG. Further, the stopper mechanism 10 disposed between the frame 18 and the support base 17 has the same configuration as the stopper mechanism 10 disposed between the top plate 19 and the frame 18.

  The stopper mechanism 10 has a contact surface capable of contacting the end of the top plate 19 and a stopper member 42 having a rack 43 formed on a lower surface facing a direction perpendicular to the contact surface. A spring 41 that is disposed between the end of the frame 18 and the stopper member 42 and biases the stopper member 42 toward the contact surface with the top plate 19, and a shaft 46 supported by the support member 47. A swinging lever 45, a pinion 44 that is rotatable about a shaft 50 that is pivotally supported by the lever 45 and that can mesh with a rack 43 formed on the lower surface of the stopper member 42, and the pinion 44 and the shaft 50 And a cam 49 that swings about a shaft 48.

  In this embodiment, the frame 18 is used as a mechanical end limit according to the present invention. In this embodiment, the spring 41 and the stopper member 42 constitute a buffer member according to the present invention.

  The pinion 44 moves between a meshing position that meshes with the rack 43 formed on the lower surface of the stopper member 42 and a separation position that is separated from the rack 43 when the lever 45 swings about the shaft 46. The pinion 44 is connected to the lever 45 via the one-way clutch 51 and the shaft 50 and rotates only in the clockwise direction around the shaft 50. The cam 49 is disposed so as to be able to come into contact with the end portion of the top plate 19 and the lever 45, and when the top plate 19 comes into contact with the end portion of the top plate 19, the pinion 44 is separated. The lever 45 is swung so as to move from the position to the meshing position.

  Next, the operation when the top plate 19 is stopped at the end of the moving stroke by the stopper mechanism 10 shown in FIG. 5 when the floating operation is performed on the top plate 19 will be described.

  In the state where the top plate 19 is arranged in the middle of the movement stroke, the end portion of the top plate 19 and the cam 49 are separated from each other as shown in FIG. In this state, the top plate 19 moves in the horizontal direction (right direction shown in FIG. 5), so that the end of the top plate 19 and the cam 49 come into contact with each other. When the top plate 19 continues to move further horizontally, the top plate 19 moves onto the cam 49 as shown in FIG. At this time, the cam 49 swings about the shaft 48 and presses the lever 45. As a result, the lever 45 swings, and the pinion 44 moves from the separation position separated from the rack 43 shown in FIG. 5A to the engagement position that engages with the rack 43 formed on the lower surface of the stopper member 42.

  If the top plate 19 continues to move further horizontally from this state and the distance between the top plate 19 and the frame 18 becomes the maximum length of the spring 41 and the stopper member 42 in a state where no stress is applied to the spring 41. The end of the top plate 19 contacts the side surface (contact surface) of the stopper member 42. And with the movement of the top plate 19, as shown in FIG.5 (b), the stopper member 42 also moves to a horizontal direction. As the stopper member 42 moves horizontally, the pinion 44 that meshes with the rack 43 formed on the lower surface of the stopper member 42 rotates clockwise about the shaft 50.

  At this time, the top plate 19 receives a biasing force of the spring 41 via the stopper member 42. Thereby, the movement of the top plate 19 is restricted, the moving speed of the top plate 19 becomes low, and the top plate 19 stops at the end of the moving stroke. For this reason, the top plate 19 can be smoothly stopped at the end of the movement stroke. The stop position of the top plate 19 at this time is determined by the spring coefficient of the spring 41 and the like.

  Even when the top plate 19 moves to the end of its moving stroke, the pinion 44 does not rotate counterclockwise by the action of the one-way clutch 51. For this reason, after the top plate 19 is stopped, the biasing force of the spring 41 does not act on the top plate 19 via the stopper member 42. Therefore, it is possible to prevent the phenomenon that the top plate 19 rebounds at the end of the moving stroke, as in the case where a stopper made of an elastic body such as rubber is used.

  When the top plate 19 is moved in the reverse direction from the end of the movement stroke, the end of the top plate 19 and the side surface of the stopper member 42 are separated from each other as shown in FIG. Also at this time, the pinion 44 is not rotated by the action of the one-way clutch 51. For this reason, the stopper member 42 does not move as the top plate 19 moves.

  In this state, the top plate 19 further moves leftward from the position shown in FIG. 5C, and the distance between the top plate 19 and the frame 18 becomes equal to or greater than the maximum length of the spring 41 and the stopper member 42. When the top plate 19 is separated from the cam 49, the cam 49 swings to the position shown in FIG. As a result, the pinion 44 is separated from the rack 43 shown in FIG. 5A from the meshing position where the pinion 44 meshes with the rack 43 formed on the lower surface of the stopper member 42 shown in FIGS. 5B and 5C. Move to the remote position. Therefore, the restriction of the movement of the stopper member 42 by the pinion 44 and the one-way clutch 51 is released, and the stopper member 42 is returned to the position shown in FIG.

  As described above, according to the stopper mechanism 10, the top plate 19 can be smoothly stopped by the biasing force of the spring 41, and the rebound after the top plate 19 is stopped is prevented by the action of the one-way clutch 51. It becomes possible to do.

  In the embodiment shown in FIG. 5, the end of the top plate 19 and the side surface of the stopper member 42 are in direct contact with each other. That is, the end portion of the top plate 19 is the “contact portion that moves together with the top plate 19” according to the present invention, and the side surface of the stopper member 42 is the “contact surface that can contact the contact portion according to the present invention. " However, in addition to the top plate 19, a contact member that is connected to the top plate 19 and moves together with the top plate 19 is provided, and this contact member is used as a contact portion to contact the stopper member 42. Also good. In the embodiment shown in FIG. 5, the frame 18 is used as a mechanical end limit according to the present invention. However, members other than the frame 18 may be used as the mechanical end limit.

  In the above description, the regulation of the movement amount when the top plate 19 is moved in the Y direction (longitudinal direction) shown in FIG. 2 has been described. However, by using the stopper mechanism 10 shown in FIG. Can be regulated in the X direction (short direction) shown in FIG.

  In this case, in the stopper mechanism 10 disposed between the support base 17 and the frame 18 shown in FIG. 2, the spring 41 and the stopper member 42 shown in FIG. It is arranged at the position. The frame 18 stops at the end of its moving stroke by the action of the stopper mechanism 10 disposed between the support base 17 and the frame 18. For this reason, the top plate 19 that moves integrally with the frame 18 is moved by the action of the stopper mechanism 10 disposed between the support 17 and the frame 18 shown in FIG. Stops together with the frame 18. Even in this case, the top plate 19 can be smoothly stopped together with the frame 18 without causing rebound.

  In the embodiment described above, the spring 41 is used together with the stopper member 42 as the buffer member according to the present invention. However, other urging means such as rubber or damper may be used instead of the spring 41. Since the examination table 100 for X-ray imaging according to the present invention has an extension limiting means for limiting and releasing the displacement of the buffer member, unlike the conventional case where an elastic body such as rubber is simply used as a stopper. No bounce will occur.

  In the above-described embodiment, the spring 41 and the stopper member 42 are used as the buffer member, but other buffer members may be used. In this case, this buffer member may be fixed to the frame 18 side that constitutes the support portion, or may be fixed to the top plate 19 side. Or you may arrange | position in the state pinched | interposed between these, without fixing to either of the flame | frame 18 and the top plate 19. FIG.

DESCRIPTION OF SYMBOLS 10 Stopper mechanism 16 Cross roller guide 17 Support stand 18 Frame 19 Top plate 31 X-ray irradiation part 32 Flat panel detector 33 C type arm 41 Spring 42 Stopper member 43 Rack 44 Pinion 45 Lever 49 Cam 51 One-way clutch 100 For X-ray photography Examination table

Claims (5)

A top plate on which the subject is placed;
Supporting the top plate movably in a direction parallel to the surface thereof, and a support portion having a mechanical end limit for limiting the stroke of the top plate;
An elastic buffer member disposed between the mechanical end limit and the top plate;
When the distance between the top plate and the mechanical end limit in a portion where the buffer member is interposed is equal to or less than a predetermined distance, the displacement of the buffer member in the extending direction is limited, and the top plate and An X-ray imaging examination table, comprising: an extension restriction means for releasing restriction of displacement in the extension direction of the buffer member when a distance between the mechanical end limits is equal to or greater than a predetermined distance. . 2. The examination table for X-ray imaging according to claim 1, wherein the predetermined distance when the restriction on the displacement of the buffer member in the extension direction is released is equal to or greater than the maximum length of the buffer member.   The examination table for X-ray imaging according to claim 1, wherein one end of the buffer member is fixed to the mechanical end limit or the top plate. The extension limiting means includes
A pinion that can only rotate in one direction,
A rack with which the pinion meshes;
A switching mechanism for switching presence / absence of engagement between the pinion and the rack;
The switching mechanism is characterized in that the pinion meshes with the rack when a distance between the top plate and the mechanical end limit is not more than a predetermined distance in a portion where the buffer member is interposed. An examination table for X-ray imaging according to any one of claims 1 to 3. A stopper member having a contact surface that can contact the contact portion that moves together with the top plate, and a rack formed in a direction intersecting the contact surface;
A biasing member that biases the stopper member in the direction of the contact surface;
A pinion that can mesh with the rack;
A lever that is connected to the pinion via a one-way clutch and swings about a support shaft to move the pinion between a meshing position where the pinion meshes with the rack and a separation position separated from the rack; ,
The pinion is disposed so as to be able to come into contact with the contact portion and the lever so that the pinion moves from the separated position to the meshing position when it comes into contact with the contact portion as the top plate moves. And a cam for swinging the lever;
A stopper mechanism for an examination table for X-ray imaging.

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