JP2010247941A - Pantograph type lifter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pantograph type lifter preventing a supporting roller from meandering or bounding up and down on a lifting base rail due to an offset load or a vibration, allowing a lifting base stably moving up and down, reinforcing the lifting base while securing the lower limit position, and securing a space for a pantograph mechanism to stably moving the lifting base up and down. <P>SOLUTION: In the pantograph type lifter 100 moving up and down by the pantograph mechanism, the lifting base 102 includes a lifting base rail 122 having a rail surface on which a supporting roller 121 of a lifting arm 112 travels and a step portion for regulating the side of the travelling direction, and a lifting base guide 125 opposed to the supporting roller 121 from below with a small gap. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pantograph lifter that moves a lifting platform in parallel by a pantograph mechanism composed of a plurality of lifting arms.

  Conventionally, as a pantograph type lifter that moves a lifting platform in parallel by a pantograph mechanism composed of a plurality of lifting arms, a pantograph mechanism composed of a plurality of lifting arms, a driving means that drives the pantograph mechanism, and a plurality of lifting arms 2. Description of the Related Art A pantograph lifter having a lifting platform that is pin-coupled to at least one lifting arm and is linearly supported by at least one other lifting arm and moves up and down is well known.

As shown in FIG. 5, these pantograph type lifters 500 are configured such that the lifting platform 501 is moved up and down in parallel with the base 502 by a pantograph mechanism including a plurality of lifting arms 510 that intersect.
One lifting arm 511 has one end rotatably connected to the lifting platform 501 by a lifting platform spindle 503 and the other end serving as a moving end 504, which is installed on the base 502 so as to be horizontally movable.
The movable end 504 is supported by moving the roller 505 provided at the movable end 504 on a base rail 506 provided at the base 502 so as to be movable.

The other lifting / lowering arm 512 has one end rotatably connected to the base 502 by a base support shaft 507 and the other end serving as a moving end 508, and is installed on the lifting / lowering base 501 so as to be horizontally movable.
The movable support 508 is supported by movably installing a support roller 521 provided at the movable end 508 on a lift rail 522 provided at the lift 501.
Two sets of pantograph mechanisms composed of the lifting arms 511 and 512 are provided in parallel to each other (front and back in the drawing).
The drive unit 550 includes a first lift drive unit 550A that moves the lift drive arm 513 and a second lift drive unit 550B that moves one lift arm 511 (see, for example, Patent Document 1). ).

Japanese Patent Laid-Open No. 2000-211185 (page 3, FIG. 1)

  However, in these known pantograph type lifters, the lifting rail is a simple planar member, or the lower surface of the lifting platform is used as it is. There is a problem that the support roller moves away from the lifting rail and the lifting platform tilts when it is meandering or when it comes into contact with an interference object when the lifting platform is lowered, which hinders stable lifting movement of the lifting platform. It was.

  In addition, when a reinforcing member is arranged on the outer periphery of the lower surface for reinforcing the lifting platform, there is a problem that if the pantograph mechanism is arranged at the lower part of the reinforcing member, there is a problem that the lowest limit position of the lifting platform is raised, and the position where the reinforcing member is avoided. When the pantograph mechanism is arranged, there is a problem that the interval between two parallel pantograph mechanisms is narrowed and the stability is further reduced.

  The present invention solves the problems of the prior art as described above, i.e., the object of the present invention is to support the support roller meandering on the lifting platform rail or interfere with the interference object even due to uneven load or vibration. The platform does not tilt by contact, and the platform is moved up and down stably, and the lower limit position is secured while reinforcing the platform, and the space between the pantograph mechanisms is secured to stabilize the platform. It is to provide a pantograph lifter that moves up and down.

  According to the first aspect of the present invention, there is provided a pantograph mechanism comprising a plurality of lifting arms, a driving means for driving the pantograph mechanism, and at least one other lifting and lowering arm that is pin-coupled to at least one lifting arm. In the pantograph lifter having a lifting platform that is supported linearly by two lifting arms and moves up and down, the other lifting arm has a support roller at the end of the lifting platform, and the lifting platform is By having a rail surface on which the support roller travels, a lift rail provided with a stepped portion that regulates the side of the support roller in the travel direction, and a lift guide that is opposed from the lower side of the support roller with a small gap, It solves the problem.

  In addition to the structure of the pantograph lifter described in claim 1, the invention according to claim 2 is characterized in that the lifting platform includes a support channel having a U-shaped cross-section with a lower surface opened on the lower surface thereof and a lateral direction. The guide channel having an open U-shaped cross section is provided, the elevator rail is provided inside the support channel, and the elevator guide is disposed below the guide channel via an elevator guide mounting base. By fixing, the said subject is further solved.

  In the invention according to claim 3, in addition to the configuration of the pantograph lifter described in claim 1 or 2, the plurality of lifting arms are provided symmetrically at both ends in the width direction of the lifting platform, The elevator rail and the elevator guide are provided symmetrically at both ends in the width direction of the elevator, and the other elevator arms are provided so that the respective support rollers face the inner side in the width direction of the elevator. Therefore, the above-described problem is further solved.

  In the invention according to claim 4, in addition to the structure of the pantograph lifter according to any one of claims 1 to 3, the guide channel is fixedly provided to the support channel. The above-mentioned problem is further solved.

  The pantograph lifter according to the first aspect of the present invention includes a pantograph mechanism composed of a plurality of lifting arms, a driving means for driving the pantograph mechanism, and at least one lifting arm among the plurality of lifting arms. In a pantograph lifter having a lifting platform that is supported linearly by at least one lifting arm and moves up and down, the other lifting arm has a supporting roller at the end of the lifting platform, and the lifting platform is a supporting roller. The support roller meandering is provided by having a lift rail that has a rail surface that travels and a step rail that regulates the side of the support roller in the running direction, and a lift guide that is opposed to the lower side of the support roller with a small gap. Because it is prevented by the step of the lift rail and separated from the rail surface of the support roller by the lift guide, Or meandering I, without or lifting platform is tilted by contact with interfering object, the elevation frame can be stably moved up and down.

  The pantograph lifter of the invention according to claim 2 has a U-shaped support channel in which the elevating platform is open on the lower surface thereof in addition to the effect produced by the pantograph lifter according to claim 1. And a guide channel having a U-shaped cross section that is open in the lateral direction, and a lift rail is provided inside the support channel, and the lift guide is located below the guide channel via a lift guide mounting base. Since the support channel and the guide channel function as a reinforcing member for the lifting platform and the position of the lifting rail is located in the support channel, the lifting and lowering can be performed without increasing the lowest limit position of the lifting platform. The table can be reinforced, and the elevator table can be moved up and down stably.

  The pantograph lifter according to the third aspect of the invention has the effect that the pantograph lifter according to the first or second aspect exhibits, and a plurality of lifting arms are symmetrically arranged at both ends in the width direction of the lifting platform. The elevator rail and the elevator guide are provided symmetrically at both ends in the width direction of the elevator, and the other lifting arms are provided so that the respective support rollers are opposed to the inner side in the width direction of the elevator. As a result, the interval between two parallel pantograph mechanisms can be arranged at an interval close to the full width of the lifting platform without increasing the lowest position of the lifting platform, and the lifting platform can be moved up and down stably. be able to.

  The pantograph lifter of the invention according to claim 4 has a guide channel fixed to the support channel in addition to the effect produced by the pantograph lifter according to any one of claims 1 to 3. As a result, the function of reinforcing the support channel and the guide channel is further enhanced, so that the lifting platform can be reinforced without increasing the lowest position of the lifting platform, and the lifting platform can be moved up and down stably. .

  A pantograph lifter according to the present invention includes a pantograph mechanism composed of a plurality of lift arms, a drive means for driving the pantograph mechanism, and at least one other lift arm that is pin-coupled to at least one lift arm of the plurality of lift arms. In a pantograph lifter having a lifting platform that is supported linearly and freely moving up and down, another lifting arm has a support roller at the end of the lifting platform, and the lifting platform is a rail surface on which the support roller runs. And a lifting / lowering rail provided with a step for regulating the side of the supporting roller in the traveling direction, and a lifting / lowering guide that is opposed to the lower side of the supporting roller with a small gap. The platform can be moved up and down stably without meandering on the platform rail or tilting due to contact with interference. However, the specific embodiment is not particularly limited as long as the lower limit position is ensured and the interval between the pantograph mechanisms is secured and the lifting platform can be moved up and down stably. But it doesn't matter.

That is, the driving means of the pantograph lifter of the present invention may be driven by hydraulic pressure or air pressure, or may be driven by a motor.
Further, the driving means of the pantograph lifter of the present invention may directly drive the lifting arm or may be driven via another lever, arm or the like.
Further, the pantograph lifter of the present invention may be a pantograph lifter using a pair of lifting arms that intersect between the base and the lifting platform, and a plurality of pairs of lifting arms that intersect between the base and the lifting platform. A pantograph lifter that is vertically connected to increase the lifting distance may be used.

Hereinafter, embodiments of the pantograph lifter of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a pantograph lifter that is an embodiment of the present invention, FIG. 2 is a plan view of a pantograph lifter that is an embodiment of the present invention, and FIG. FIG. 4 is a front view of a pantograph lifter according to an embodiment of the present invention, and FIG. 4 is a partially enlarged view of FIG.

As shown in FIGS. 1 to 3, the pantograph lifter 100 according to an embodiment of the present invention moves the lifting platform 101 in parallel with the base 102 by a pantograph mechanism including a pair of lifting arms 110 intersecting with each other. It is configured to be.
One lifting arm 111 has one end rotatably connected to the lifting platform 101 by a lifting platform support shaft 103 and the other end serving as a moving end 104, which is installed horizontally on the base 102.
This movable support of the moving end 104 is performed by movably installing a roller 105 provided at the moving end 104 on a base rail 106 provided at the base 102.

One end of the other lifting arm 112 is rotatably connected to the base 102 by a base support shaft 107, and the other end is a moving end 108. The other lifting arm 112 is installed on the lifting base 101 so as to be horizontally movable.
The movable end 108 is supported by movably installing a support roller 121 provided at the moving end 108 on a lift rail 122 provided at the lift 101.
The pantograph mechanism composed of the lifting arms 111 and 112 is paired in parallel with each other (front and back in FIG. 1, up and down in FIG. 2, left and right in FIG. 3), and each support roller 121 has a width of the lifting platform 101. The crossing portions of the pair of elevating arms 111 and 112 are rotatably connected to each other by a crossing portion connecting shaft 114.

The drive unit 150 includes a geared motor 151, a drive screw shaft 153, and a drive nut 154. The drive nut 154 provided on the drive connection shaft 155 that connects the moving ends 104 of the pair of lifting arms 111 is advanced and retracted by the drive screw shaft 153. As a result, the roller 105 provided at the moving end 104 of the lift arm 111 is moved back and forth on the base rail 106 provided on the base 102, thereby moving the lift base 101 up and down.
The geared motor 151 outputs the two drive screw shafts 153 so as to rotate synchronously in parallel in the width direction, and two sets of drive nuts 154 are provided on the drive connecting shaft 155, so that the moving ends 104 of the pair of lifting arms 111 are moved. It can be moved in the forward and backward directions without error.

As shown in FIG. 3, a pair of U-shaped support channels 123 opened in the lower direction and a pair of U-shaped guide channels opened in the lateral direction are formed on the lower surfaces of both sides of the elevator 101. 124 is fixed with the support channel 123 outside in the width direction and the guide channel 124 inside in the width direction, and reinforces the lifting platform 101.
Each support channel 123 is provided with an elevator rail 122 on which the support roller 121 travels, and an elevator guide 125 is provided below each guide channel 124 via an elevator guide mounting base 126. ing.

As shown in FIG. 4, the elevator platform rail 122 is provided with a rail surface 127 on which the support roller 121 travels and a step portion 128 that regulates the travel direction side of the support roller 121, and the support roller 121 meanders. Is preventing.
Further, when the guide surface 129 of the lift guide 125 is opposed to the lower side of the support roller 121 with a minute gap, and the contact with the interference object occurs when the lift 101 is lowered, the support roller 121 has the rail surface 127. It is possible to prevent the lifting platform 101 from being tilted away from the work, and to prevent a workpiece or the like placed on the lifting platform 101 from falling off.

  Further, as shown in FIG. 3, the base rail 106 provided on the base 102 is also provided with a rail surface on which the roller 105 travels and a step portion for regulating the side of the roller 105 in the traveling direction, like the lift rail 122. The roller 105 is prevented from meandering, and the guide surface of the base guide 109 provided on the base 102 is opposed from the upper side of the roller 105 with a slight gap. The roller 105 is prevented from moving away from the rail surface and tilting the lifting platform 101 when there is contact with an interfering object, and the workpiece placed on the lifting platform 101 is prevented from falling off. Yes.

Since the elevator guide 125 is detachably fixed to the guide channel 124 via the elevator guide mounting base 126, assembly and maintenance can be easily performed.
Further, since the base guide 109 is also detachably fixed to the base 102, assembly and maintenance work can be easily performed.

  As described above, according to the pantograph lifter of the present invention, the support roller can be moved up and down stably without the support roller meandering or bouncing up and down due to uneven load or vibration. In addition, the lower limit position can be secured while reinforcing the lifting platform, and the lifting platform can be moved up and down stably by securing the interval of the pantograph mechanism.

  In the above embodiment, the base rail 106 is provided with a stepped portion, the base 102 is provided with the base guide 109, and the roller 105 provided at the moving end 104 of the lifting arm 111 is connected by the drive connecting shaft 155. Thus, meandering and detachment from the rail surface are less likely to occur when driven by the driving means 150.

The side view of the pantograph type lifter which is one Example of this invention. The top view which partially cut off the pantograph type lifter which is one Example of this invention. The front view of the pantograph type lifter which is one Example of this invention. FIG. 4 is a partially enlarged view of FIG. 3. A side view of a conventional pantograph lifter.

100, 500 ... Pantograph lifter 101, 501 ... Lifting platform 102, 502 ... Base 103, 503 ... Lifting platform spindle 104, 504 ... Moving end 105, 505 ... Roller 106, 506 ... Base rail 107, 507 ... Base support shaft 108, 508 ... Moving end 109 ... Base guide 110, 510 ... Lift arms 111, 511 ... Lift arms 112, 512 ... Elevating arm 513 ... Elevating drive arm 114 ... Connecting bar 121, 521 ... Support rollers 122, 522 ... Elevating stand rail 123 ... Support channel 124 ... Guide channel 125 ... Elevator guide 126 ... Elevator guide mounting base 127 ... Rail surface 128 ... Step portion 129 ... Guide surfaces 150, 5 50 ・ ・ ・ Drive means 151 ・ ・ ・ Geared motor 152 ・ ・ ・ Support bracket 153 ・ ・ ・ Drive screw shaft 154 ・ ・ ・ Drive nut 155 ・ ・ ・ Drive coupling shaft

Claims (4)

A pantograph mechanism composed of a plurality of lifting arms, a driving means for driving the pantograph mechanism, and at least one lifting arm of the plurality of lifting arms are pin-coupled and supported by at least one other lifting arm so as to be linearly movable. In a pantograph lifter having a lifting platform that is moved up and down,
The other lifting arm has a supporting roller at the lifting platform side end,
The elevator base is provided with a rail surface on which the support roller travels, a lift rail provided with a step that regulates the side of the support roller in the travel direction, and a lift guide that is opposed to the lower side of the support roller with a minute gap. A pantograph lifter characterized by comprising: The lifting platform has a U-shaped support channel opened in the lower direction on the lower surface and a U-shaped guide channel opened in the lateral direction,
The lift rail is provided inside the support channel;
2. The pantograph lifter according to claim 1, wherein the lift guide is fixed below the guide channel via a lift guide mounting base. The plurality of lifting arms are provided symmetrically at both ends in the width direction of the lifting platform,
The elevator rail and the elevator guide are provided symmetrically at both ends in the width direction of the elevator,
3. The pantograph lifter according to claim 1, wherein the other lifting arm is provided so that each supporting roller faces the inner side in the width direction of the lifting platform.   The pantograph lifter according to any one of claims 1 to 3, wherein the guide channel is fixed to the support channel.

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