JP2006125620A - Locking releasing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To release locking in two positions to which a moving member is moved and locked with the same locking releasing device. <P>SOLUTION: When a second lever outer arm 52 of a second lever 50 is pulled upward at the highest position, a second lever inner arm 51 pushes down an upper end pin 32 of an X arm 30 locked in an upper end pin stop hole 23, and when an upper frame 20 is pushed down in this state, the upper end pin is horizontally moved in an upper end pin guide hole 33 and released from locking. When the second lever outer arm of the second lever is pulled upward at the lowest position, a first lever push-down pin 53 attached to the second lever outer arm pushes down a first lever outer arm 42, and with such movement, a projection 43 fitted to the lower end of a first lever inner arm 41 is released from locking in a holding member attached to a lower frame. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an unlocking device for a moving member that is moved and locked to at least two positions, and more particularly to an unlocking device for an upper frame of an elevating device that raises and lowers an upper frame relative to a lower frame.

There is a device for moving and locking the moving member to two positions. For example, there is a lifting device that lifts and lowers the upper frame relative to the lower frame, and it is used in many fields. In particular, many X-arm type lifting devices are used. In the X arm type lifting device, the height is changed by changing the distance between the two arms on the lower end side or the upper end side of the X arm. And in order to change the distance, there are many things which used the worm gear as described in patent document 1, for example. If the worm gear is used, it is possible to stop at any position including the highest position and the lowest position if the rotation of the gear is stopped. However, in order to move it, the worm gear must be rotated many times, which takes time. In addition, since the worm gear is used, the cost of parts becomes high and wear tends to occur. If an electric actuator is used like patent document 2, cost will become still higher.
Therefore, in a small lifting device, the biasing force of the spring is applied to reduce the distance between the two arms on the lower or upper end of the X arm, and the upper frame is locked at the highest position and the lowest position, respectively. Many are locked by a mechanism. In such a case, an unlocking device for unlocking is required, but conventionally, separate unlocking devices are provided at the highest position and the lowest position, respectively, and the highest position is reached with the same unlocking device. There was a strong need to be able to disengage both of the lowest positions.

Japanese Patent Application Laid-Open No. 7-289828 Japanese Patent Laid-Open No. 10-129314

  In view of the above problems, an object of the present invention is to perform the unlocking at the two positions by the same unlocking device, although the moving member is moved and locked at the two positions.

According to the first aspect of the present invention, there is provided an unlocking device for a moving member that is moved and locked to at least two positions,
Including a first lever and a second lever, wherein the first lever operates in conjunction with the operation of the second lever;
In the first position, the unlocking is performed by the movement of the second lever when the second lever is operated, and in the second position, the movement of the first lever is performed when the second lever is operated. The lock is released by
An unlocking device is provided.
In the unlocking device configured as described above, the locking can be released by operating the second lever in either the first position or the second position.

According to a second aspect of the present invention, in the first aspect of the present invention, the unlocking device is an unlocking device attached to a lifting device that lifts and lowers the upper frame relative to the lower frame, and the upper frame is a moving member. Because
An elevating device is an elevating / lowering member that moves in response to the raising and lowering of the upper frame, and a guide member that is attached to the upper frame and that engages with an end of the elevating / lowering member to guide the movement of the elevating / lowering member. A guide member including a highest position holding portion that holds the upper frame in the highest position by locking the lifting and lowering member end element provided at the end of the lifting and lowering member when in the highest position;
The first lever is pivotally attached to a first lever shaft attached to the upper frame, and a first lever outer arm extending laterally outward from the first lever shaft and a first lever outer arm are formed integrally with the first lever. A first lever inner arm extending substantially downward from the shaft, and projects in a horizontal direction from the first lever inner arm. When the upper frame is at the lowest position, it is locked to a lowest position holding member formed on the lower frame. Including a protrusion and a first lever spring that biases the first lever in a predetermined direction;
The second lever includes a second lever outer arm extending outward from the second lever shaft so that the user can operate, and a second lever formed integrally with the second lever outer arm and extending inward from the second lever shaft. An inner arm, and a second lever spring that biases the second lever in a predetermined direction,
When the second lever outer arm of the second lever is pulled upward when the upper frame is in the uppermost position, the second lever inner arm engages the lifting element end element with the guide member maximum position holding portion. Release the stop,
When the second lever outer arm of the second lever is pushed down when the upper frame is at the lowermost position, the second lever inner arm pushes down the first lever outer arm of the first lever, and accordingly, the first lever Release the locking to the lowest position holding member formed on the lower frame of the protrusion attached to the lower end of the lever inner arm,
An unlocking device is provided.

According to the invention of claim 3, in the invention of claim 2, the lifting device is an X arm type lifting device,
An X-arm having two arms that are pivotally attached to a center pin and whose crossing angle is variable.
The lifting / lowering member end element is an upper end pin attached to the upper ends of the two arms of the X arm,
The guide member includes a horizontal elongated hole extending in the horizontal direction and a vertical elongated hole extending vertically from the end of the horizontal elongated hole, and the vertical elongated hole is the highest position holding portion.
An unlocking device is provided.

According to the invention of claim 4,
An unlocking device for a moving member that is moved and locked to at least two positions,
A first lever, a second lever, a third lever,
Including an interlocking member for interlocking the first lever and the third lever with the second lever;
In the first position, when the second lever is operated, the unlocking is performed by the movement of the third lever interlocked via the interlocking member,
In the second position, when the second lever is operated, the unlocking is performed by the movement of the first lever linked via the interlocking member.
An unlocking device is provided.

According to the invention of claim 5, in the invention of claim 4,
The unlocking device is an unlocking device attached to a lifting device that lifts and lowers the upper frame relative to the lower frame, the upper frame being a moving member,
The lifting device includes a lifting / lowering member that moves in response to the lifting and lowering of the upper frame, and a guide member that is attached to the upper frame and that engages with an end member of the lifting / lowering member and guides the movement of the lifting / lowering member.
The first lever is pivotally attached to a first lever shaft attached to the upper frame, and a first lever outer arm extending laterally outward from the first lever shaft and a first lever outer arm are formed integrally with the first lever. A first lever inner arm extending substantially downward from the shaft, and projects in a horizontal direction from the first lever inner arm. When the upper frame is at the lowest position, it is locked to a lowest position holding member formed on the lower frame. Including a protrusion and a first lever spring that biases the first lever in a predetermined direction;
The third lever is pivotally attached to a third lever shaft attached to the upper frame, and a third lever outer arm extending substantially upward from the third lever shaft, and a third lever shaft formed integrally with the third lever outer arm. A third lever inner arm extending substantially inwardly from the side and a third lever spring for urging the third lever in a predetermined direction. The third lever inner arm is used when the upper frame is at the uppermost position. When the person does not operate the second lever, the lifting / lowering member end element can be held at the uppermost end corresponding position,
The second lever includes a second lever outer arm extending outward from the second lever shaft so that the user can operate, and a second lever formed integrally with the second lever outer arm and extending inward from the second lever shaft. An inner arm, and a second lever spring that biases the second lever in a predetermined direction,
The interlocking member extends in a substantially horizontal direction and is movable in a substantially horizontal direction. The interlocking member has a first inclined surface to which the first lever outer arm is attached at the inner end, and the second lever at the outer end. The outer arm has a second inclined surface to which the outer arm is attached, and an engaging portion is formed on the lower side to engage the third lever outer arm.
When the second lever outer arm of the second lever is pulled upward when the upper frame is at the uppermost position, the second lever inner arm moves on the second inclined surface of the interlocking member, and accordingly, the interlocking member moves inward. When the third lever outer arm is engaged with the engaging portion of the interlocking member, the third lever is rotated, and the third lever inner arm is the end member of the lifting / lowering response member. Release the support at the highest position holding part,
When the second lever outer arm of the second lever is pulled upward when the upper frame is at the lowermost position, the second lever inner arm moves on the second inclined surface of the interlocking member, and accordingly, the interlocking member moves inward. The first lever outer arm is pushed downward by the first inclined surface of the interlocking member, and accordingly, the lowest position holding member formed on the lower frame of the protrusion attached to the lower end of the first lever inner arm To release the lock
An unlocking device is provided.

According to the invention of claim 6, in the invention of claim 5,
The lifting device is an X arm lifting device,
An X-arm having two arms that are pivotally attached to a center pin and whose crossing angle is variable.
The lifting / lowering member end element is an upper end pin attached to the upper ends of the two arms of the X arm,
An unlocking device is provided in which the guide member is a horizontal slot extending in the horizontal direction, and the inner end of the horizontal slot is the highest position holding portion.

  According to the present invention, the unlocking can be performed by the operation of the same second lever in both the first position and the second position.

Hereinafter, an embodiment of an unlocking device of the present invention attached to a lifting device will be described with reference to the accompanying drawings.
The lifting device to which the unlocking device of this embodiment is attached is a so-called X arm type lifting device, and FIG. 1 releases the upper frame of the X arm type lifting device from the state where it is locked at the highest position. It is a figure explaining operation and action at the time. FIG. 2 is a view seen from the direction II in FIG.

  A first lever attachment member 40 a and a second lever attachment member 50 a are attached to the lower surface of the upper frame 20. A first lever shaft 40b is attached to the first lever mounting member 40a, and the first lever 40 is pivotally attached to the first lever shaft 40b and is urged counterclockwise in the drawing by the first lever spring 40c. A second lever shaft 50b is attached to the second lever attachment member 50a, and the second lever 50 is pivotally attached to the second lever shaft 50b and is urged clockwise in the drawing by the second lever spring 50c. A second lever stopper 50d is attached to the second lever mounting member 50a.

  The first lever 40 includes a first lever inner arm 41 extending substantially downward from the first lever shaft 40b and a first lever outer arm 42 extending laterally outward from the first lever shaft 40b. 41 and the first lever outer arm 42 are integrally formed. A projection 43 is formed at the lower end of the first lever inner arm 41 so as to project laterally toward the first lever outer arm 42 at a substantially right angle to the longitudinal direction of the first lever inner arm 41. The lower surface of the protrusion 43 is inclined.

The second lever 50 has a second lever inner arm 51 extending substantially laterally inward from the second lever shaft 50b and a second lever outer arm 52 extending laterally outward from the second lever shaft 50b. The inner arm 51 and the second lever outer arm 52 are integrally formed. A first lever push-down pin 53 is attached to the second lever inner arm 51. The outermost end portion of the second lever outer arm 52 is shaped to be easily lifted by the user.
When the second lever 50 is not operated, the second lever inner arm 51 comes into contact with the stopper 50d, the first lever outer arm 42 of the first lever 40 comes into contact with the first lever push-down pin 53, and stops. Yes.

  Further, an arm upper end support member 21 for supporting the upper end of the X arm 30 (only one is shown) of the lifting device is attached to the lower surface of the upper frame 20. The arm upper end support member 21 is formed with an elongated upper end pin guide hole 22 extending in the horizontal direction. An upper end pin stop hole 23 that is short and extends in the vertical direction is formed continuously at the center end of the upper end pin guide hole 22.

An upper end pin 32 is attached to the upper end of the X arm 30, and the upper end pin 32 slides in the upper end pin guide hole 22 while the upper frame 20 is moved up and down. When the upper frame 20 reaches the highest position, the upper end pin stops. It engages with the hole 23 and is located at its upper end.
Note that the upper end pins 32 are always urged by springs 37 in a direction in which they approach each other.

When the upper frame 20 is at the highest position, it is in a state indicated by a solid line. From this state, when the outermost end portion of the second lever outer arm 52 of the second lever 50 is pulled upward, the second lever 50 rotates counterclockwise and is in the state indicated by the alternate long and short dash line.
At this time, the lower surface of the tip of the second lever inner arm 51 pushes down the upper end pin 32 of the X arm 30 positioned at the uppermost end of the arm upper end stop hole 23.

  When the upper frame 20 is pushed downward while the outermost end portion of the second lever outer arm 52 is pulled upward, the upper end pin 32 of the X arm 30 moves in the horizontal upper end pin guide hole 22 to the right in the figure. Accordingly, the upper frame 20 descends toward the lower frame 10 (see FIGS. 3 and 4). If the upper frame 20 starts to descend, the lifting of the second lever outer arm 52 may be released.

  The first lever push-down pin 53 attached to the second lever inner arm 51 rotates the first lever outer arm 42 of the first lever 40 in the clockwise direction.

On the other hand, FIG. 3 is a view for explaining operations and operations when releasing the upper frame of the X arm type lifting apparatus from the state where it is locked at the lowest position. FIG. 4 is a view seen from the direction IV in FIG.
In FIG. 3, reference numeral 10 denotes a lower frame, and a holding member 15 is attached to the upper surface of the lower frame 10. The holding member 15 has a vertical portion 16 extending vertically upward and a horizontal portion 17 extending in the horizontal direction from the upper end of the vertical portion 16.
Instead of providing the holding member 15, an engagement hole in which the protrusion 43 attached to the lower end of the first lever inner arm 41 of the first lever 40 can be engaged may be formed in the lower frame 10.

Before explaining the release from the holding at the lowest position, the operation when it is held at the lowest position will be described.
When the upper frame 20 is pushed down, the inclined lower surface 44 of the projection 43 attached to the lower end of the first lever inner arm 41 of the first lever 40 comes into contact with the upper edge 17a of the horizontal portion 17 of the holding member 15 described above. Touch (displayed with hatching). When the upper frame 20 is further pushed down, the first lever inner arm 41 of the first lever 40 automatically rotates clockwise in the figure, and the tip of the projection 43 comes into contact with the tip vertical surface 17b of the horizontal portion 17 of the holding member 15. Further, it descends along the tip vertical surface 17b. Finally, the protrusion 43 enters the lower side of the horizontal portion 17 of the holding member 15 and is in a state indicated by a one-dot chain line in FIG. 2, and the upper frame 20 is locked at the lowest position. The upper end pin 32 of the X arm 30 is positioned at the right end of the upper end pin guide hole 22.

Hereinafter, an operation and an operation for releasing the upper frame 20 that is locked at the lowest position as described above in order to raise it will be described.
When the outermost end portion of the second lever outer arm 52 of the second lever 50 is lifted upward from the state of the solid line in FIG. 3, the second lever 50 rotates counterclockwise to the state shown by the alternate long and short dash line. Become. At this time, the first lever push-down pin 53 attached to the second lever inner arm 51 rotates the first lever outer arm 42 of the first lever 40 clockwise.

Accordingly, the projection 43 attached to the lower end of the first lever inner arm 41 of the first lever 40 is detached from the lower side of the horizontal portion 17 of the holding member 15.
The upper frame 20 is pulled upward for a while while the outermost end portion of the second lever outer arm 52 is pulled upward. Thereafter, even if the user releases the hand, the upper frame 20 is lifted by the force of the spring 37.
Since the upper end pin 32 of the X arm 30 is positioned at the right end of the upper end pin guide hole 22, the second lever inner arm 51 has no effect on the upper end pin 32 of the X arm 30.

Next, a second embodiment of the present invention will be described.
FIG. 5 is a view for explaining the operation and operation when releasing the upper frame of the similar X arm type lifting apparatus from the state where it is locked at the highest position. In addition, the same number is attached | subjected to the components similar to said 1st Embodiment.

A third lever attachment member 60a is attached to the lower surface of the upper frame 20 in addition to the first lever attachment member 40a and the second lever attachment member 50a similar to those of the first embodiment. A third lever shaft 60b is attached to the third lever mounting member 60a, and the third lever 60 is pivotally attached to the third lever shaft 60b and is urged clockwise in the drawing by the third lever spring 60c.
Further, an interlocking member 70 for interlocking the first lever 40 and the third lever 60 with the movement of the second lever 50 is disposed on the lower surface of the upper frame 20 so as to be movable in the horizontal direction.
A large plate 25 that extends vertically downward is attached to the upper frame 20, and a straight rail member 26 that extends vertically in the drawing front and back direction is attached to the plate 25. 70 slides between the upper frame 20 and the rail member 26.

A first lever 40 and a second lever 50 similar to those of the first embodiment are attached to the first lever mounting member 40a and the second lever mounting member 50a, respectively.
The third lever 60 has a substantially sector-shaped third lever inner arm 61 extending inwardly from the first lever shaft 60b and a third lever outer arm 62 extending substantially upward from the third lever shaft 60b. The lever inner arm 61 and the third lever outer arm 62 are integrally formed. The tip surface 63 of the third lever inner arm 61 is provided with a recess 64 in which the upper end pin 32 of the X arm 30 is engaged.

  The second lever 50 has a second lever inner arm 51 and a second lever outer arm 52 similar to those in the first embodiment. Unlike the first embodiment, the first lever push-down pin 53 is not attached to the second lever inner arm 51. Instead, the surface of the inner end portion of the second lever inner arm 51 is a smooth curve. Have been to have.

  The interlocking member 70 has a first inclined surface 71 and a second inclined surface 72 at the inner end portion and the outer end portion, respectively. The first inclined surface 71 is formed so that the upper side protrudes inward from the lower side, and the first lever outer arm 42 always abuts. The second inclined surface 72 is formed so that the lower side protrudes outward from the upper side, and the second lever inner arm 51 always abuts.

  The interlocking member 70 further has an engaging portion 73 on the lower surface, with which the third lever outer arm 62 is engaged. The engaging portion 73 is formed as a claw projecting downward provided on the outer end portion of the interlocking member 70.

Further, a rack synchronization member 74 extending inward is integrally attached to the interlocking member 70. The synchronizing member 74 has a length having a portion where the left and right synchronizing members 70 overlap each other even when the interlocking member 70 is located on the outermost side. A rack 75 is formed at the front end portion, and the rack 75 is fixedly positioned with respect to the upper frame 20 and meshed with a rotatable gear 76. FIG. 7 is a sectional view taken along line VII-VII in FIG.
By being configured in this way, the left and right movements are synchronized, and if one of the second levers 50 is actuated, both the right and left disengagement operations can be performed.

  Similarly to the first embodiment, an arm upper end support member 21 for supporting the upper end of the X arm 30 (only one is shown) of the lifting device is attached to the lower surface of the upper frame 20. The arm upper end support member 21 is formed with a long hole-shaped upper end pin guide hole 24 extending in the horizontal direction. Unlike the first embodiment, the upper end pin guide hole 24 is not provided with an upper end pin stop hole extending in the vertical direction.

  An upper end pin 32 is attached to the upper end of the X arm 30, and the upper end pin 32 slides in the upper end pin guide hole 24 from the outside to the inside while the upper frame 20 is raised. The upper end pin 32 rides over the upper surface 62 of the third lever inner arm 61 while rotating the third lever 60 so as to push down the upper surface 62 of the third lever inner arm 61, and the tip end surface 63 of the third lever inner arm 61. Get inside. The third lever 60 is rotated by the biasing force of the third lever spring 60c in the reverse direction so that the depressed third lever inner arm 61 is raised. Then, the upper end pin 32 of the X arm 30 engages with a recess 64 provided on the tip end surface 63 of the third lever inner arm 61 and is prevented from moving outward.

When the upper frame 20 is at the highest position, it is in a state indicated by a solid line. From this state, when the outermost end portion of the second lever outer arm 52 of the second lever 50 is pulled upward, the second lever 50 rotates counterclockwise and is in the state indicated by the alternate long and short dash line.
At this time, the lower surface of the distal end portion of the second lever inner arm 51 presses the second inclined surface 72 of the interlocking member 70, and the interlocking member 70 is moved in the left direction in the drawing. Then, since the third lever outer arm 62 is engaged with the claw 73 on the lower surface of the interlocking member 70, the third lever 60 is rotated counterclockwise. As a result, the third lever inner arm 61 that has pressed the upper end pin 32 of the X arm 30 from the side (in this case, from the right direction) is retracted into the lower side of the upper end pin 32 of the X arm 30, The upper end pin 32 can move outward (in this case, to the right). During this time, the upper end pin 32 of the X arm 30 temporarily moves inward by the depth of the recess when it escapes from the recess 64 of the tip surface 63 of the third lever inner arm 61. The position of the X arm 30 at this time is indicated by a one-dot chain line.
At the same time, the first inclined surface 71 of the interlocking member 70 presses the first lever outer lever 42 of the first lever 40, so that the first lever 40 is rotated, but the operation at the uppermost end position of the upper frame 20 is performed. In this case, the first lever 40 does not act on the other.

  When the upper frame 20 is pushed downward while the outermost end portion of the second lever outer arm 52 is pulled upward, the upper end pin 32 of the X arm 30 moves in the horizontal upper end pin guide hole 22 to the right in the figure. Accordingly, the upper frame 20 descends toward the lower frame 10 (see FIGS. 3 and 4). If the upper frame 20 starts to descend, the lifting of the second lever outer arm 52 may be released.

  On the other hand, FIG. 6 is a diagram for explaining the operation and operation when releasing the upper frame of the X arm type lifting apparatus from the state where it is locked at the lowest position. FIG. 4 is a view seen from the direction IV in FIG. In FIG. 6, reference numeral 10 denotes a lower frame similar to that of the first embodiment. Similarly, a holding member 15 having a vertical portion 16 and a horizontal portion 17 is attached to the upper surface of the lower frame 10.

  Before the description of the release from the holding at the lowest position, the operation when it is held at the lowest position is the same as in the first embodiment, and when the upper frame 20 is pushed down, the first The inclined lower surface 44 of the protrusion 43 attached to the lower end of the first lever inner arm 41 of the lever 40 abuts on the upper end edge 17a of the horizontal portion 17 of the holding member 15 (shown by hatching). When the upper frame 20 is further pushed down, the first lever inner arm 41 of the first lever 40 automatically rotates clockwise in the figure, and the tip of the projection 43 comes into contact with the tip vertical surface 17b of the horizontal portion 17 of the holding member 15. Further, it descends along the tip vertical surface 17b. Finally, the protrusion 43 enters the lower side of the horizontal portion 17 of the holding member 15 and is in a state indicated by a one-dot chain line in FIG. 2, and the upper frame 20 is locked at the lowest position. The upper end pin 32 of the X arm 30 is positioned at the right end of the upper end pin guide hole 22.

Hereinafter, an operation and an operation for releasing the upper frame 20 that is locked at the lowest position as described above in order to raise it will be described.
When the outermost end portion of the second lever outer arm 52 of the second lever 50 is lifted upward from the state of the solid line in FIG. 6, the first lever 40 is watched by the interlocking action similar to that described in the uppermost position. Rotate around.

Accordingly, the projection 43 attached to the lower end of the first lever inner arm 41 of the first lever 40 is detached from the lower side of the horizontal portion 17 of the holding member 15.
The upper frame 20 is pulled upward for a while while the outermost end portion of the second lever outer arm 52 is pulled upward. Thereafter, even if the user releases the hand, the upper frame 20 is lifted by the force of the spring 37.
Since the upper end pin 32 of the X arm 30 is positioned at the right end of the upper end pin guide hole 22, the second lever inner arm 51 has no effect on the upper end pin 32 of the X arm 30.

  Although the present invention is applied to a lifting device, it can also be applied to devices and machines that are detachably engaged in different places.

It is a figure explaining operation and an operation | movement when canceling | releases the upper frame of a X arm type raising / lowering apparatus from the state latched in the highest position. It is a figure explaining operation and an operation | movement when canceling | releasing the upper frame of a X arm type raising / lowering apparatus from the state latched in the lowest position. It is the figure which looked at FIG. 1 from the direction of III. It is the figure which looked at FIG. 2 from the direction of IV. It is a figure explaining operation and operation when releasing from the state where the upper frame of the X arm type raising and lowering device was locked in the highest position in a 2nd embodiment. It is a figure explaining operation and action when releasing from the state where the upper frame of the X arm type lifting device was locked in the lowest position in a 2nd embodiment. It is the figure seen along the VII-VII line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lower frame 15 Holding member 16 Horizontal part 17 Vertical part 20 Upper frame 22 Upper end pin guide hole 23 Upper end pin stop hole 30 X arm 32 Upper end pin 40 1st lever 41 1st lever inner arm 42 1st lever outer arm 43 Protrusion 50 Second lever 51 Second lever inner arm 52 Second lever outer arm 53 First lever push-down pin 60 Third lever 61 Third lever inner arm 62 Third lever outer arm 70 Interlocking member 71 First slope 72 Second slope 73 Engagement Joint 74 Synchronizing member 75 Rack 76 Gear

Claims (6)

An unlocking device for a moving member that is moved and locked to at least two positions,
Including a first lever and a second lever, wherein the first lever operates in conjunction with the operation of the second lever;
At the first position, the lock is released by the movement of the second lever when the second lever is operated, and at the second position, the lock is released by the movement of the first lever when the second lever is operated. Is done,
An unlocking device characterized by that. The unlocking device is an unlocking device attached to a lifting device that lifts and lowers the upper frame relative to the lower frame, the upper frame being a moving member,
An elevating device is an elevating / lowering member that moves in response to the raising and lowering of the upper frame, and a guide member that is attached to the upper frame and that engages with an end of the elevating / lowering member to guide the movement of the elevating / lowering member. A guide member including a highest position holding portion that holds the upper frame in the highest position by locking the lifting and lowering member end element provided at the end of the lifting and lowering member when in the highest position;
The first lever is pivotally attached to a first lever shaft attached to the upper frame, and a first lever outer arm extending laterally outward from the first lever shaft and a first lever outer arm are formed integrally with the first lever. A first lever inner arm extending substantially downward from the shaft, and projects in a horizontal direction from the first lever inner arm. When the upper frame is at the lowest position, it is locked to a lowest position holding member formed on the lower frame. Including a protrusion and a first lever spring that biases the first lever in a predetermined direction;
The second lever includes a second lever outer arm extending outward from the second lever shaft so that the user can operate, and a second lever formed integrally with the second lever outer arm and extending inward from the second lever shaft. An inner arm, and a second lever spring that biases the second lever in a predetermined direction,
When the second lever outer arm of the second lever is pulled upward when the upper frame is in the uppermost position, the second lever inner arm engages the lifting element end element with the guide member maximum position holding portion. Release the stop,
When the second lever outer arm of the second lever is pushed down when the upper frame is at the lowermost position, the second lever inner arm pushes down the first lever outer arm of the first lever, and accordingly, the first lever Release the locking to the lowest position holding member formed on the lower frame of the protrusion attached to the lower end of the lever inner arm,
The unlocking device according to claim 1. The lifting device is an X arm lifting device,
An X-arm having two arms that are pivotally attached to a center pin and whose crossing angle is variable.
The lifting / lowering member end element is an upper end pin attached to the upper ends of the two arms of the X arm,
The guide member includes a horizontal slot extending in the horizontal direction and a vertical slot extending vertically from the end of the horizontal slot, and the vertical slot is the highest position holding portion.
The unlocking device according to claim 2, wherein: An unlocking device for a moving member that is moved and locked to at least two positions,
A first lever, a second lever, a third lever,
Including an interlocking member for interlocking the first lever and the third lever with the second lever;
In the first position, when the second lever is operated, the unlocking is performed by the movement of the third lever interlocked via the interlocking member,
In the second position, when the second lever is operated, the unlocking is performed by the movement of the first lever linked via the interlocking member.
An unlocking device characterized by that. The unlocking device is an unlocking device attached to a lifting device that lifts and lowers the upper frame relative to the lower frame, the upper frame being a moving member,
The lifting device includes a lifting / lowering member that moves in response to the lifting and lowering of the upper frame, and a guide member that is attached to the upper frame and that engages with an end member of the lifting / lowering member to guide the movement of the lifting / lowering member
The first lever is pivotally attached to a first lever shaft attached to the upper frame, and a first lever outer arm extending laterally outward from the first lever shaft and a first lever outer arm are formed integrally with the first lever. A first lever inner arm extending substantially downward from the shaft, and projects in a horizontal direction from the first lever inner arm. When the upper frame is at the lowest position, it is locked to a lowest position holding member formed on the lower frame. Including a protrusion and a first lever spring that biases the first lever in a predetermined direction;
The third lever is pivotally attached to a third lever shaft attached to the upper frame, and a third lever outer arm extending substantially upward from the third lever shaft, and a third lever shaft formed integrally with the third lever outer arm. A third lever inner arm extending substantially inwardly from the side and a third lever spring for urging the third lever in a predetermined direction. The third lever inner arm is used when the upper frame is at the uppermost position. When the person does not operate the second lever, the lifting / lowering member end element can be held at the uppermost end corresponding position,
The second lever includes a second lever outer arm extending outward from the second lever shaft so that the user can operate, and a second lever formed integrally with the second lever outer arm and extending inward from the second lever shaft. An inner arm, and a second lever spring that biases the second lever in a predetermined direction,
The interlocking member extends in a substantially horizontal direction and is movable in a substantially horizontal direction. The interlocking member has a first inclined surface to which the first lever outer arm is attached at the inner end, and the second lever at the outer end. The outer arm has a second inclined surface to which the outer arm is attached, and an engaging portion is formed on the lower side to engage the third lever outer arm.
When the second lever outer arm of the second lever is pulled upward when the upper frame is at the uppermost position, the second lever inner arm moves on the second inclined surface of the interlocking member, and accordingly, the interlocking member moves inward. When the third lever outer arm is engaged with the engaging portion of the interlocking member, the third lever is rotated, and the third lever inner arm is the end member of the lifting / lowering response member. Release the support at the highest position holding part,
When the second lever outer arm of the second lever is pulled upward when the upper frame is at the lowermost position, the second lever inner arm moves on the second inclined surface of the interlocking member, and accordingly, the interlocking member moves inward. The first lever outer arm is pushed downward by the first inclined surface of the interlocking member, and accordingly, the lowest position holding member formed on the lower frame of the protrusion attached to the lower end of the first lever inner arm To release the lock
The unlocking device according to claim 4. The lifting device is an X arm lifting device,
An X-arm having two arms that are pivotally attached to a center pin and whose crossing angle is variable.
The lifting / lowering member end element is an upper end pin attached to the upper ends of the two arms of the X arm,
The guide member is a horizontal slot that extends in the horizontal direction, and the inner end of the horizontal slot is the highest position holding portion.
The locking release device according to claim 5, wherein:

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