JP3164571B2 - Lifting lifter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating lifter used as an elevating device in medical equipment such as an X-ray imaging table and other industrial equipment.

[0002]

2. Description of the Related Art Conventionally, as an elevating lifter used for an X-ray imaging table, for example, an X-frame leg in which leg frames (a first leg frame and a second leg frame) are pivotally mounted at a central portion thereof, It is generally known to include a telescopic drive unit (for example, a hydraulic cylinder) whose base end is rotatably connected to a fixed member. In this lifting lifter, the upper end of one leg frame is rotatably connected to the lifting frame, and the lower end moves (slides) to the pedestal frame.
The other leg frame has an upper end connected to the elevating frame so as to be movable (slidable) and a lower end rotatably connected to the pedestal frame. It was rotatably connected to the leg frame. Therefore, in this lifting / lowering lifter, when the expansion / contraction drive unit is extended / contracted, one leg frame connected to the extension / retraction unit undulates, and the other leg frame follows and undulates accordingly,
When the X frame legs are opened and closed at the central shaft attachment portion, the lifting frame is raised and lowered. In this case, when the leg frame is lying down, the X frame leg is opened flat to lower the lifting frame, and conversely, when the leg frame is raised, the X frame leg is raised in an X shape to raise the lifting frame.

[0003]

As described above, in the lifting lifter, the leg frame is raised and lowered by the expansion and contraction of the expansion and contraction driving means. In this case, the stroke direction of the expansion and contraction driving means and the extension direction of the leg frame are adjusted. It is desirable to make the angle as large as possible in order to make the power of the expansion and contraction driving means act efficiently. However, in order to make the lifting lifter compact, it is necessary to dispose the telescopic driving means so as to fit between the pedestal frame and the lifting frame. In this case, the telescopic direction of the telescopic driving means and the leg frame It is difficult to make a sufficient angle with the extension direction in terms of space. In particular, in the state where the leg frame falls down and the X-frame leg is opened flat, the angle between the telescopic drive means and the leg frame becomes small. Therefore, in order to stand up from this state, large power is required as the telescopic drive means. Must be used.

[0004] Conventionally, the distal end of the telescopic drive means has been rotatably connected to one of the leg frames. Therefore, the power of the expansion / contraction drive means acts only on one leg frame, and the other leg frame follows the one leg frame and only undulates. In this case, since the power of the telescopic drive means acts on one leg frame in a biased manner, the power loss of the telescopic drive means becomes large, and an excessive load is applied to the central shaft attachment portion of the X frame leg, which causes a trouble. There was a problem that caused.

Conventionally, as described in Japanese Patent Application Laid-Open No. 8-217392, there is a device in which the distal end of the telescopic drive means and one leg frame are connected by an intermediate arm.
This intermediate arm merely connects the tip of the telescopic drive means and one leg frame, and does not describe the structure and operation of the link that performs the lever operation at all. Therefore, the power of the telescopic drive means acts only on one leg frame, and the other leg frame follows the one leg frame only to undulate, and the power of the telescopic drive means is applied to both leg frames. They cannot work at the same time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. The X-frame legs are constructed by utilizing the leverage of one lever while using one telescopic drive means. The power of the telescopic drive means is simultaneously applied to both leg frames. This prevents the power from being biased by the telescopic drive means and reduces the power loss,
Provided is an elevating lifter that prevents an excessive load from being applied to the center shaft attachment portion, and that can be stably raised by a telescopic drive unit with small power even when the X frame leg is opened flat. That is the task.

[0007]

In order to solve the above-mentioned problems, a lifting lifter according to the present invention comprises: an X-frame leg in which a first leg frame and a second leg frame are pivotally mounted at a central portion; Telescopic drive means having an end rotatably connected to the fixed member, wherein the first leg frame has an upper end rotatably connected to the lifting frame and a lower end movably (slidably) connected to the base frame. The second leg frame is an elevating lifter whose upper end is movably (slidably) connected to the elevating frame and whose lower end is rotatably connected to the pedestal frame. One end of the connecting link is rotatably connected to the one leg frame at a position above the center shaft attachment portion, and the lever link is connected to the other leg frame (second leg frame) at a position above the center shaft attachment portion. Attached to the center so that it can rotate The lower end of this lever link is formed so as to be able to abut on one of the leg frames (first leg frame) in the lying state at a position lower than the central shaft attachment portion, and in the abutted state, the leg frame ( The upper end of the lever link and one end of the connection link are rotatably connected on the first leg frame), and the distal end of the expansion / contraction drive means is rotatably connected to the connection portion. Configuration.

In this lifter, since the telescopic drive means and one leg frame (for example, the first leg frame) are connected by the connecting link, the power from the telescopic drive means is transmitted through the first link via the connecting link. Acting on the frame, the first leg frame can be raised and lowered by expansion and contraction of the expansion and contraction drive means. Further, the telescopic drive means and the other leg frame (second leg frame) are connected via a lever link, and the lower end of the lever link is formed so as to be able to abut on the first leg frame in the fall-down state. In the contact state, it is formed movably on the first leg frame. That is, in a state where both the leg frames fall down and the X frame legs are opened flat, the lower ends of the lever links are in contact with the first leg frames. When the telescopic drive unit is expanded and contracted in this state, the lever link has a connecting point with the telescopic drive unit as an emphasis point, a contact portion of the first leg frame with the movement guide surface as a fulcrum, and an axis with the second leg frame. Since the lever action is performed so that the attachment portion becomes the action point, the power of the expansion / contraction driving means acts so as to push up the second leg frame in the rising direction.

As described above, it is possible to simultaneously apply the power from the telescopic drive means to both the first leg frame and the second leg frame constituting the X frame leg while using one telescopic drive means. it can. Accordingly, it is possible to prevent the power from being biased by the expansion and contraction drive means, to reduce the power loss, and to prevent an unreasonable load from being applied to the central shaft attachment portion. Therefore, even when the X frame leg is opened flat, it can be smoothly raised by the expansion / contraction drive unit with small power.

In the lifting lifter of the present invention, a roller is provided at the lower end of the lever link, and a moving guide surface with which the roller is movably abutted is formed at a position lower than a central shaft attaching portion of one leg frame. And a roller is provided at a position lower than the central shaft attachment portion of one of the leg frames, and a movement guide surface with which the roller is movably abutted is formed at the lower end of the lever link. (Claim 3).

[0011]

Embodiments of the present invention will be described below with reference to the drawings. Drawings show an embodiment of the present invention, FIG. 1 is a first embodiment, a side view showing a lifting lifter in the middle of ascent, FIG. 2 is a side view showing a lifting lifter in a lowered state, FIG. 3 is a side view showing the lifting lifter in an ascending state, and FIG. 4 is a plan view of the lifting lifter.

In FIG. 1, reference numeral 1 denotes an X frame leg, and a first leg frame 2 and a second leg frame 3 are rotatably mounted on a shaft at a central portion. The first leg frame 2 has an upper end rotatably connected to the elevating frame 4 by a shaft 20 and a lower end movable (rolled) via a roller 21 to a lower guide rail formed on the pedestal frame 5. Are linked. The upper end of the second leg frame 3 is connected to an upper guide rail 40 formed on the lifting frame 4 via a roller 31 so as to be movable (rollable), and the lower end of the second leg frame 3 is rotatable by the shaft 30 on the base frame 5. Are linked.

The first leg frame 2 has a central shaft attaching portion 1.
At one position above zero, one end of the connection link 6 is rotatably connected by a shaft 61 through a long hole 60, and the second leg frame 3 is provided with a lever link 7 at a position above the central shaft attachment portion 10. The center 70 is rotatably mounted on the shaft 70. A roller 71 is provided at a lower end of the lever link 7, and the roller 71 is provided at a lower position than the center shaft attaching portion 10 with respect to the first leg frame 2 in the lying state.
2 and is formed so as to be able to move (roll) on the moving guide surface 22 in the contact state. The roller 71 of the lever link 7 is formed so as to be separated from the first leg frame 2 while the X frame leg 1 is standing. Then, the upper end of the lever link 7 and one end of the connection link 6 are rotatably connected by a shaft 80, and the distal end of the screw type telescopic tube 8 as a telescopic drive means is connected to the connection part by using the shaft 80 in common. It is connected rotatably.

The screw type telescopic tube 8 is a motor frame 8
6 is rotatably connected to a pedestal frame 5 as a fixing member by a shaft 81, a screw rod 82 is connected to an electric motor 84 provided on the motor frame 86, and is connected to an upper end of the lever link 7. A tube member 83 is connected to one end of the link 6 by a shaft 80, and a threaded rod 82 is screwed into a ball nut 85 provided inside the tube member 83. Therefore, when the screw rod 82 is rotated forward and reverse by the electric motor 84, the screw rod 82
It moves in and out, and the whole expands and contracts.

Next, the operation of the lifter will be described. In this elevating lifter, when the screw type telescopic tube 8 is expanded and contracted, the first leg frame 2 is linked with the shaft
And the second leg frame 3 undulates about the lower end axis 30, and at the same time, the first leg frame 2
The roller 21 provided at the lower end of the second leg frame 3 and the roller 31 provided at the upper end of the second leg frame 3 are guided by guide rails 40 and 50, respectively.
The X frame leg 1 moves (rolls) in the
To open and close. The lifting frame 4 is moved up and down by opening and closing the X frame leg 1, and in this case, the leg frame 2,
In the state in which the X-frame legs 3 are lying down, the X-frame legs 1 are opened flat and the lifting frame 4 is lowered as shown in FIG. 1 rises in an X-shape, and the lifting frame 4 rises.

In this lifter, in order to raise the lift frame 4 from the lower position shown in FIG. 2, the screw type telescopic tube 8 is extended. In this case, since the screw type telescopic tube 8 and the first leg frame 2 are connected by the connecting link 6, the first leg frame 2 stands up through the connecting link 6 with the extension of the screw type telescopic tube 8. To be pulled up. The screw type telescopic tube 8 and the second leg frame 3 are connected via a lever link 7.
A roller 71 provided at the lower end of the first leg frame 2 is formed so as to be able to abut on the moving guide surface 22 of the first leg frame 2 in the lying state. Therefore, when the screw-type telescopic tube 8 is extended in this state, the lever 80 moves the roller 80 with respect to the moving guide surface 22 of the first leg frame 2 when the shaft 80 at the upper end becomes the power point A.
Of the second leg frame 3 and the point of application C, so that the second portion of the second leg frame 3 becomes the point of application C.
The leg frame 3 is pushed up in a direction to stand. As described above, when the lifting frame 4 is raised from the lowered state, the screw type telescopic tube is connected to the first leg frame 2 via the connecting link 6 and to the second leg frame 3 via the lever link 7. The first leg frame 2 and the second leg frame 3 can be simultaneously erected by the power of the screw-type telescopic tube 8 because the power of 8 works.

The roller 71 of the leverage link 7 moves (rolls) upward on the movement guide surface 22 of the first leg frame 2 as the X frame leg 1 stands up. The position of the fulcrum C moves. Then, when the X frame leg 1 stands up halfway, the roller 71 of the lever link 7 separates from the moving guide surface 22 of the first leg frame 2. Second leg frame 3 by leverage link 7 from this separation
Is released, and the power of the screw type telescopic tube 8 acts only on the first leg frame 2. At this time, the second leg frame 3 has already risen halfway, so that the connecting link 6 A small power enough to pull up the one leg frame 2 is enough. Further, regarding the structure for moving the lower end of the lever link 7 on the first leg frame 2, the roller 71 of the lever link 7 is configured to roll on the movement guide surface 22 of the first leg frame 2. First
It can be moved smoothly on the leg frame 2.
During the operation of the lever link 7, the shaft 61 moves freely in the elongated hole 60, and when the shaft 61 comes into contact with the end of the elongated hole 60, the operation of the lever link 7 ends, and the roller 31 is moved to the first leg frame 2
Floating away from.

Also, the second leg frame 3 by leverage link 7
When the lever is pushed up, a force acts on the action point C in a direction to push up the second leg frame 3 until the lever link 7 and the second leg frame 3 are at a right angle. The force acts in the direction in which the robot falls. Therefore, before or before the lever link 7 is perpendicular to the second leg frame 3, the roller 71 is moved to the first leg frame 2.
In order to separate from the top, the length of the lever
The position of 0 will be set.

Next, FIG. 5 is a side view of a second embodiment of the present invention, showing a lifter being lifted. In the second embodiment, the center shaft attachment portion 1 of the first leg frame 2
The roller 23 is provided at a position lower than 0, and is characterized in that a moving guide surface 72 that is movably (roller-moved) abuts against the roller 23 is formed at the lower end of the lever link 7. The other configuration is the same as that of the first embodiment, and the same reference numerals are used in the drawings to omit the description.

Therefore, the structure for moving the lower end of the lever link 7 on the first leg frame 2 will be described.
Since the moving guide surface 72 of the lever link 7 rolls on the roller 23 with the roller 23 provided on the fixed side as a fixed side, the moving guide surface 22 formed on the first leg frame 2 is changed as in the first embodiment. As the fixed side, it is possible to move the roller 71 more smoothly than that of the structure in which the roller 71 rolls on the moving guide surface 22.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to this.
For example, a screw-type telescopic tube was used as the telescopic drive means,
The invention is not limited thereto, and a hydraulic cylinder or the like may be used. Further, the lifting / lowering lifter of the present invention is used as a lifting / lowering device for medical equipment such as an X-ray imaging stand or other industrial equipment, and its use is not limited. In this embodiment, a connecting link is connected to the first leg frame,
Although the lever link is pivotally attached to the second leg frame, the lever link may be pivotally attached to the first leg frame, and the link may be coupled to the second leg frame. Also, when an inverter type electric motor is used, slow stop or slow up can be performed, and the impact can be softened.

[0022]

As described above, in the elevating lifter of the present invention, both the first leg frame and the second leg frame constituting the X frame leg are used while using one telescopic drive means. , The power of the telescopic drive means can be applied simultaneously. Accordingly, it is possible to prevent the power from being biased by the expansion and contraction drive means, to reduce the power loss, and to prevent an unreasonable load from being applied to the central shaft attachment portion. Therefore, even when the X-frame legs are opened flat, the expansion and contraction drive means with small power can smoothly raise the X-frame legs.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment, showing a lifter being lifted.

FIG. 2 is a side view showing the lifting lifter in a lowered state.

FIG. 3 is a side view showing the elevating lifter in a raised state.

FIG. 4 is a plan view of the lifting lifter.

FIG. 5 is a side view showing a lifter in the middle of ascent according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 X-frame leg 10 Central shaft attaching part 2 1st leg frame 22 Moving guide surface 23 Roller 3 2nd leg frame 4 Elevating frame 5 Pedestal frame 6 Connecting link 7 Lever link 70 Shaft attaching part 71 Roller 72 Moving guide surface 8 Screw type expansion / contraction Pipe (telescopic drive means)

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-72698 (JP, A) JP-A-10-330092 (JP, A) JP-A-8-217392 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B66F 7/06

Claims (3)

(57) [Claims] 1. An X-frame leg in which a first leg frame and a second leg frame are pivotally mounted at a center portion thereof, and telescopic drive means having a base end pivotally connected to a fixed member, The first leg frame has an upper end rotatably connected to the lifting frame and a lower end movably connected to the pedestal frame,
The second leg frame is an elevating lifter whose upper end is movably connected to the elevating frame and whose lower end is rotatably connected to the pedestal frame. One end of the connection link is rotatably connected to the other leg frame, and the middle of the lever link is rotatably mounted on the other leg frame at a position above the center shaft mounting portion. It is formed so as to be able to abut on one leg frame at a position lower than the central shaft attachment portion, and is formed so as to be movable on the leg frame in the abutted state. An elevating lifter, wherein one end is rotatably connected, and the distal end of the expansion / contraction driving means is rotatably connected to the connection part. 2. The lifter according to claim 1, wherein a roller is provided at a lower end portion of the lever link, and a movement guide surface on which the roller is movably abutted is located below the center shaft attachment portion of the one leg frame. Lifting lifter that is formed on. 3. The lifter according to claim 1, wherein a roller is provided at a position lower than the center shaft attaching portion of one of the leg frames, and a moving guide surface on which the roller movably abuts is a lower end of the lever link. Lifting lifter that is formed on.