JP2021095260A - Multistage lifting device - Google Patents

Abstract

To provide a multistage lifting device with excellent stability capable of raising/lowering multistage columnar supports electrically.SOLUTION: A multistage lifting device includes a foundation base 3, a foundation columnar support 4, at least one intermediate stage columnar support 5, an upper stage columnar support 6, a cargo receiving tool 7, and a wire driving mechanism 8. The wire driving mechanism 8 includes a winch drum 11 for winding the foundation columnar support 4 side of a wire W, and an electric motor 12 for rotatably driving the winch drum 11. The winch drum 11 and the electric motor 12 are mounted on a lower part of the foundation columnar support 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a multi-stage lifting device for raising and lowering a load receiving device.

As an elevating device that receives and elevates a load, there is one disclosed in Patent Document 1. This luggage lifting device guides the loading platform up and down to a post erected on the trolley, and a wire rope wound around the winding drum of the manual wire winding device attached to the post is attached to the upper end of the post. In a load lifting device connected to the load receiving table via a shaft-supported pulley, the load receiving member of the load receiving table is fixed to the lower part of the guide member of the load receiving table that engages with the post, and the load receiving member of the load receiving table is fixed onto the load receiving member. A table for receiving goods is attached detachably (the scope of claims for utility model registration).

Jitsukaisho 61-178795

In the prior art, the cradle can be raised and lowered with respect to a post (post) by winding a wire rope with a wire take-up device, but the cradle is raised to a position higher than one post. Also, the wire winding device is a manual type and cannot be electrically wound.
In order to electrically raise the loading platform to a higher position than one support, it is conceivable to provide one or more lifting columns on the post to make it a multi-stage support type, and if it is a multi-stage support type, the wire rope will be Since it becomes long, it is conceivable to make the wire winding device electric.

However, if an electric wire take-up device is used with a multi-stage strut, the center of gravity of the multi-stage elevating device moves upward and the installation during work becomes unstable, or when a heavy object is placed on the loading platform, the multi-stage elevating device is used. There is also a new problem that the ascending resistance of the stanchions increases and the ascending order from the cradle to the stanchions becomes irregular.
An object of the present invention is to provide a multi-stage elevating device capable of solving such problems of the prior art.

The present invention provides a multi-stage elevating device capable of electrically elevating and lowering multi-stage columns and having good stability by making the columns multi-stage, making the wire drive mechanism electric, and arranging the winch drum and the motor at the lower part of the device. The purpose is.
In the present invention, a resistance adding means for giving ascending resistance to the middle stanchion is provided in front of the upper detector for detecting the maximum ascent of the middle stanchion with respect to the foundation stanchion. It is an object of the present invention to provide a multi-stage elevating device in which an upper support column is raised so that the ascending order can be properly performed.

Specific means for solving the problem in the present invention are as follows.
First, the foundation pedestal 3, the foundation stanchion 4 fixed on the foundation pedestal 3, at least one middle stanchion 5 supported by the foundation stanchion 4 so as to be movable up and down, and the middle stanchion 5 to move up and down. A wire is extended from the foundation strut 4 to the upper strut 6 via the upper strut 6 which is possibly supported, the load receiving tool 7 which is vertically movable and supported by the upper strut 6, and the wire. A wire that raises the load receiving tool 7 with respect to the upper support 6 by pulling W toward the foundation support 4, raises the upper support 6 with respect to the middle support 5, and raises the middle support 5 with respect to the foundation support 4. It is a multi-stage elevating device equipped with a drive mechanism 8.
The wire drive mechanism 8 has a winch drum 11 that winds up the base support 4 side of the wire W and an electric motor 12 that rotationally drives the winch drum 11, and the winch drum 11 and the electric motor 12 are placed in the lower part of the base support 4 or the electric motor 12. It is characterized in that it is mounted on the base 3.

Secondly, between the foundation support 4 and the middle support 5 supported by the foundation support 4, it is detected that the middle support 5 has reached the highest position, and the wire winding by the motor 12 is stopped. It is characterized in that a device 15U and a resistance adding means 16 that gives an ascending resistance to the middle support column 5 before the detector 15U detects the device 15U are provided.
Thirdly, the upper detector 15U is provided on the upper part of the foundation support column 4, and the middle support column 5 is provided with an operating member 19 that operates the upper detector 15U when the upper limit of ascending position is reached. And.

Fourth, the resistance adding means 16 has an upper stopper 21U provided on the foundation support column 4 and a movable hit 22 provided on the middle support column 5 and capable of colliding with the upper stopper 21U, and the movable hit 22 Alternatively, the upper stopper 21U is characterized by having a resistance member 23 that elastically projects the collision surface in the collision direction.
Fifth, the foundation support 4, the middle support 5, and the upper support 6 each have an upper sheave 26 around which a wire W is wound, so that the foundation support 4, the upper support 6, and the upper support 6 can be moved up and down. The supported load receiving device 7 has a lower sheave 27 around which the wire W is wound, and the tip of the wire W is connected to the upper portion of the upper support column 6 or the load receiving device 7.

Sixth, the foundation support 4 has a guide rail 4G that is long in the vertical direction and an upper roller UR.
The middle support column 5 has a lower roller DR that rolls in the guide rail 4G of the foundation support column 4, a middle stage guide rail 5G that is long in the vertical direction in which the upper roller UR of the foundation support column 4 rolls, and an upper roller UR. And
The upper column 6 has a lower roller DR that rolls in the middle guide rail 5G, and an upper guide rail 6G that is long in the vertical direction in which the upper roller UR of the middle column 5 rolls.
The load receiving tool 7 is characterized by having a pair of upper and lower rollers UR and DR that roll on the upper guide rail 6G.

Seventh, the foundation support 4 is erected with respect to a substantially horizontal foundation 3 in a direction of escaping from the load receiving tool 7, and the foundation 3 has wheels 31 that move in a substantially horizontal posture. The foundation support 4 is characterized by having auxiliary wheels 32 that come into contact with the foundation when the foundation base 3 is in a substantially vertical position.
Eighth, the lower actuating member 61 is provided on the load receiving tool 7, and the foundation column 4 detects that the lower actuating member 61 of the load receiving tool 7 has reached the lowest lowered position and stops the wire drawing by the motor 12. It is characterized in that the detector 60 is provided.

Ninth, it is characterized in that an adjuster 62 that can be grounded is provided in the lower portion of the left and right side portions of the foundation base 3.

According to the present invention, it is possible to provide a multi-stage elevating device that can electrically elevate and elevate a multi-stage column and has good stability.
Further, according to the present invention, the load receiving tool and the upper strut can be raised before the middle strut reaches the highest rising position with respect to the foundation strut, and the ascending order can be made appropriate.
That is, the invention according to claim 1 is an electric motor in which a fixed foundation column 4, at least one middle column 5, and an upper column 6 form a multi-stage column, and a winch drum 11 is rotationally driven by a wire drive mechanism 8. Since the winch drum 11 and the electric motor 12 are mounted on the lower part of the foundation column 4 or the foundation base 3, the multi-stage column can be electrically raised and lowered and the stability of the device during work can be improved.

In the invention according to claim 2, an upper detector 15U for detecting that the middle support 5 has reached the highest position is provided between the foundation support 4 and the middle support 5, and before the upper detector 15U detects the upper detector 15U. Since the resistance adding means 16 for giving the ascending resistance to the middle column 5 is provided, the load receiving tool 7 is raised and the upper column 6 is raised before the middle column 5 reaches the maximum ascending position with respect to the foundation column 4. It is possible to make the ascending order proper, and it is possible to avoid stopping the drive of the wire driving mechanism 8 before the load receiving device 7 and the upper support column 6 are ascended.

In the invention according to claim 3, since the upper detector 15U is provided on the upper part of the foundation support column 4 and the operating member 19 is provided on the middle stage support column 5, the ascending upper limit position of the operating member 19 can be accurately set.
In the invention according to claim 4, the resistance adding means 16 has an upper stopper 21U provided on the foundation support 4 and a movable hit 22 provided on the middle support column 5, and the movable hit 22 or the upper stopper 21U.
Since the resistance member 23 is provided so as to elastically project the collision surface in the collision direction, it is possible to give an ascending resistance to the middle support column 5 by the elastic resistance of the resistance member 23 after the movable hit 22 collides with the upper stopper 21U. it can.

In the invention according to claim 5, the foundation support 4, the middle support 5, and the upper support 6 have an upper sheave 26, the middle support 5, the upper support 6, and the load receiving tool 7 have a lower sheave 27, and the tip of the wire W. Is connected to the upper part of the upper column 6, so that by simply winding one wire, the load receiving device 7 can be raised first, then the upper support 6 can be raised, and then the middle support 5 can be raised. it can.
In the invention according to claim 6, the foundation column 4 has a guide rail 4G long in the vertical direction and an upper roller UR, and the middle column 5 is a lower roller DR that rolls in the guide rail 4G of the foundation column 4. The upper roller UR of the foundation support 4 has a middle guide rail 5G that is long in the vertical direction and the upper roller UR rolls, and the upper support 6 has a lower roller DR that rolls in the middle guide rail 5G. Since the upper roller UR of the middle column 5 has a long upper guide rail 6G that rolls in the vertical direction, and the load receiving tool 7 has a pair of upper and lower rollers UR and DR that roll the upper guide rail 6G. , The middle support column 5, the upper support column 6 and the load receiving tool 7 can be smoothly moved up and down.

In the invention according to claim 7, the foundation support 4 is erected with respect to a substantially horizontal foundation base 3 in a direction of escaping from the load receiving tool 7, and the foundation base 3 has wheels 31 that move in a substantially horizontal posture. Since the multi-stage lifting device 1 is in a standing position, the load can be lifted and lowered in a well-balanced manner, and the foundation support 4 has an auxiliary wheel 32 that touches the ground when the foundation base 3 is in a substantially vertical position. The multi-stage elevating device 1 can be placed in a sideways position to facilitate movement / accommodation for loading on a vehicle or the like.

According to the eighth aspect of the present invention, the foundation support column 4 is provided with a lower detector 60 that detects that the lower actuating member 61 of the load receiving tool 7 has reached the lowest lowered position and stops the wire withdrawal by the motor 12. The lower limit position of the receiving tool 7 can be made accurate.
In the invention according to claim 9, since the adjuster 62 that can be grounded is provided in the lower part of the left and right side portions of the foundation base 3, the foundation base 3 can be stably grounded, and the load receiving tool 7, the upper support column 6, the middle stage support column 5, etc. It is possible to reduce their shaking when raising and lowering.

It is a left side view of the extended state which shows the embodiment of this invention. It is a left side view of the contracted state. It is a front view of the contracted state. It is a top view of the contracted state. It is a front explanatory view of the foundation strut and the middle strut in the contracted state. FIG. 5 is a cross-sectional view taken along the line Y1-Y1 of FIG. FIG. 5 is a cross-sectional view taken along the line Y2-Y2 of FIG. It is a front explanatory view of the foundation strut and the middle strut in the extended state. FIG. 8 is a cross-sectional view taken along the line X1-X1 of FIG. FIG. 8 is a cross-sectional view taken along the line X2-X2 of FIG. It is a Z1-Z1 arrow view of FIG. FIG. 8 is a cross-sectional view taken along the line Z2-Z2 of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIGS. 1 to 4, the multi-stage elevating device 1 is roughly classified into a foundation base 3, a foundation support 4 fixed on the foundation support 3, and at least one supported by the foundation support 4 so as to be vertically movable (embodiment). 3), 2 or 4), the upper support 6 supported by the middle support 5 so as to be vertically movable, and the load receiving tool 7 supported by the upper support 6 so as to be vertically movable. And a wire drive mechanism 8 for winding up the wire W extending from the foundation support 4 to the upper support 6 via the middle support 5.

The middle column 5, the load receiving tool 7, and the like are arranged on the rear side from the foundation column 4, and the columns such as the foundation column 4, the middle column 5, and the upper column 6 have widths in the left-right direction and are vertically and vertically arranged on the left and right sides. A long guide rail is formed in the direction.
In the base base 3, the rear part of the front frame 3B having the same plan view gate shape is mounted and connected to the front part of the plan view gate shape main frame 3A, and the leg frame 3C can be folded upward on both sides of the main frame 3A. The stabilizer 3D is undulatingly provided on the bracket 45 which is pivotally connected to the main frame 3A and fixed to each side of the main frame 3A and the front frame 3B. The leg frame 3C is fixed to the main frame 3A by the lock pin 63 when the leg frame 3C is in the horizontally deployed posture.

Adjusters 62 are provided at the lower portions (near the lock pin 63) on the left and right sides of the main frame 3A of the foundation base 3. By grounding the adjuster 62 to the ground, the grounding of the foundation base 3 can be stabilized, and the lock pin 63 can be easily inserted and removed when the leg frame 3C is unfolded or folded upward. Further, when the load receiving tool 7, the upper support column 6 and the middle stage support column 5 are moved up and down, they are reduced from shaking, and a stable raising and lowering operation can be performed.

Further, the lower part of the foundation support 4 is fixed to the central portion of the main frame 3A via a fixing bracket 42, and the foundation base 3 is attached to the front left and right side portions of the front frame 3B, the rear portion of both leg frames 3C, and the tip of the stabilizer 3D. Is provided with a universal wheel 31 that moves in a substantially horizontal posture.
Wheels 31 are also provided at the front of the left and right leg frames 3C, and when the leg frames 3C are folded upward, they come into contact with the ground so that the multi-stage elevating device 1 can be moved and stored in the warehouse while standing. ..

The foundation column 4 is fixed in an inclined posture (forward leaning posture) in which the upper part is on the front side from a vertical posture with respect to the foundation base 3, and is for maintaining the inclined posture between the middle part in the vertical direction and the front frame 3B. Reinforcing rod 43 is provided. By tilting the foundation column 4, the middle column 5, and the upper column 6 forward, the load receiving tool 7 can be raised and brought closer to directly above the foundation column 4 from the rear.

Further, an auxiliary wheel 32 that touches the ground when the foundation base 3 is in a substantially vertical posture is provided in the middle of the foundation support 4. When the multi-stage elevating device 1 is laid down on the front side, the auxiliary wheels 32 and the wheels 31 on the front left and right sides of the front frame 3B come into contact with each other, and the multi-stage elevating device 1 is placed in a sideways posture so that it can be moved or stored in a warehouse. ..
As shown in FIGS. 11 and 12, the foundation column 4, the middle column 5, and the upper column 6 are formed of an extruded aluminum material having substantially the same cross-sectional shape, and a substantially horizontally long rectangular box portion L is formed in the center. Guide rails G are formed on the left and right sides of the box portion L.

The guide rails G (4G, 5G, 6G) of each support have an outer rail portion M opened in the left-right outward direction and an inner rail portion N adjacent to the rear side of the outer rail portion M and opened in the left-right inward direction. The outer rail portion M and the inner rail portion N share one flange portion and are adjacent to each other.
In the foundation support 4, the outer rail portion M of the guide rail 4G does not serve as a guide rail for guiding the rollers, and the flange portion of the outer rail portion M is the reinforcing rod 43, training wheels 32, hanger 34, and the like. It is used for attaching the support 57 and the cover 35 of the winch drum 11 of the wire drive mechanism 8.

In FIGS. 1 to 10, an opening 40 is formed in the box portion L at the upper part of the foundation column 4, an upper sheave 26 is arranged in the opening 40, and a support bracket 41 for supporting the rotation shaft 26a of the upper sheave 26 is provided. Is attached to the flange portion of the outer rail portion M.
The rotation shaft 26a of the upper sheave 26 is inclined so that the outer periphery thereof protrudes back and forth from the opening 40, and the wire W wound around the upper sheave 26 extends from the front side of the foundation column 4 to the upper side of the sheave. It is designed to pass through and come out to the rear side.

The upper sheave 26 may have a rotation shaft 26a arranged in the left-right direction so that the outer circumference thereof is orthogonal to the width direction of the foundation support column 4, but the outer circumference of the upper sheave 26 may greatly protrude from the front and rear surfaces of the foundation support column 4. Further, since the outer diameter of the upper sheave 26 had to be reduced, the upper sheave 26 was arranged so as to be inclined at 60 to 80 degrees, for example, 75 degrees with respect to the front and rear surfaces of the foundation support column 4.

The upper sheaves 26 provided at the upper portions of the middle column 5 and the upper column 6 are inclined in the same manner as the foundation column 4, but are arranged at an angle of 15 to 45 degrees, for example, 30 degrees with respect to the front and rear surfaces of the columns. Since all the upper sheaves 26 are inclined in the same direction, the upper sheaves 26 do not interfere with each other even if the columns are lowered and contracted.
An upper roller UR is provided on the upper side of the foundation support 4 on the upper side of the inner rail portion N, and the upper roller UR rotatably engages with the outer rail portion M of the middle guide rail 5G to cause the middle support. An upper roller UR is provided on the upper side of the inner rail portion N on the upper part of the three middle stanchions 5 to guide the ascent and descent of the 5, and the guide rails of the middle stanchion 5 and the upper stanchion 6 on the rear side. It rotatably engages with the outer rail portion M of G (5G, 6G) to guide the ascending and descending of the middle column 5 and the upper column 6.

A lower sheave 27 around which the wire W is wound is provided below the middle column 5 and the upper column 6. The rotation axis 27a of the lower sheave 27 is orthogonal to the surface of the box portion L, so that the lower sheave 27 is arranged along the surface of the box portion L.
The lower sheave 27 of the middle support column 5 next to the foundation support column 4 winds the wire W descending from the upper sheave 26 of the foundation support column 4 around the lower side of the lower sheave 27 to reach the upper sheave 26 of the middle stage support column 5. Let me. The lower sheave 27 of the upper column 6 winds the wire W descending from the upper sheave 26 of the third middle column 5 around the lower side of the lower sheave 27 to reach the upper sheave 26 of the upper column 6.

Further, a lower roller DR is provided below the outer rail portion M in the lower part of the three middle column 5 and the upper column 6. The lower roller DR of the first middle column 5 is rotatably engaged with the inner rail portion N of the foundation column 4 to guide the ascent and descent of the middle column 5, and the second and third middle columns 5 and the upper column 6 The lower roller DR of the lower roller DR rotatably engages with the inner rail portion N of the middle column 5, and guides the middle column 5 and the upper column 6 to move up and down.

The load receiving tool 7 has a shorter vertical dimension than the upper support column 6, and a fork member 52 having an L-shaped side view is detachably connected to the load receiving tool 7, and the cross-sectional shape of the load receiving tool 7 is the middle stage column 5 and the upper stage. A guide rail G having an outer rail portion M and an inner rail portion N is formed on the left and right side portions of the central box portion L having the same cross-sectional shape as the support column 6 and the like, and the fork material 52 is perpendicular to the inner rail portion N. The part is fitted and fixed. As shown by virtual lines in FIGS. 1 and 2, the fork material 52 can be turned upside down and attached to the load receiving tool 7.

The load receiving tool 7 is provided with a pair of upper and lower rollers UR and DR on the outer rail portion M, and is rotatably engaged with the inner rail portion N of the upper support column 6, and the sheave 55 is provided between the upper and lower rollers UR and DR. Is placed. In this sheave 55, the wire W descending from the upper sheave 26 of the upper support column 6 is wound around the lower side of the sheave 55 to reach the upper part of the back surface of the upper support column 6.
The tip of the wire W is connected to the upper part of the back surface of the upper support column 6, and from there, it goes around the lower side of the sheave 55 of the load receiving device 7 to reach the upper sheave 26 of the upper support column 6, and is wound on the upper side of the upper sheave 26. It is hung to reach the lower sheave 27 below it, extends upward from the lower sheave 27 of the upper support 6 to the upper sheave 26 of the middle support 5, then reaches the lower sheave 27 of the middle support 5, and reaches the lower sheave 27 of the middle support 5. After turning around the lower sheave 27, it reaches the upper sheave 26 above the foundation column 4, and the wire W around the upper sheave 26 is wound around the winch drum 11 of the wire drive mechanism 8.

The cutting edge of the wire W can also be connected to the load receiving tool 7. The wire W coming down from the upper sheave 26 of the upper support column 6 is directly connected to the load receiving tool 7. The sheave 55 of the receiving tool 7 becomes unnecessary.
The wire drive mechanism 8 includes a winch drum 11 that winds up the base column 4 side of the wire W, an electric motor 12 that rotationally drives the winch drum 11, a battery 13 for the electric motor 12, and a control box 58. ..

A support 57 is attached to the lower part of the front surface of the foundation support 4, the shaft 11a of the winch drum 11 is supported on the support 57, and the motor 12 is attached, and the battery 13 is arranged in the front frame 3B of the foundation 3. However, the control box 58 is placed on the front frame 3B. The battery 13 may be mounted on the lower part of the foundation column 4.
The electric motor 12 is a DC power supply type geared motor, the battery 13 is provided with a charger, a breaker is installed in the control box, and an operation controller 59 is connected to the control box.

The electric motor 12 may be an AC power supply type geared motor, and may be supplied with external power from indoor wiring or a power supply vehicle via a power cord and an outlet. If the electric motor 12 is an AC power source type and is dedicated to receiving external power, the multi-stage elevating device 1 does not have to be equipped with the battery 13.
When the wire drive mechanism 8 is manually operated, the winch drum 11 may be arranged near the center of the base column 4 in the vertical direction, and a handle for rotation may be provided on the shaft 11a of the winch drum 11.

The foundation column 4, the middle column 5, and the upper column 6 are provided with stoppers and the like for setting the upper limit and the lower limit of movement of the members that move relative to each other, and the foundation column 4 detects the upper limit movement of the middle column 5. An upper detector 15U is provided to stop the driving of the electric motor 12.
In FIGS. 5 to 10, on the back surface of the foundation column 4 (the surface facing the middle column 5), block-shaped stoppers 21 and detectors 15 such as limit switches are provided on the upper and lower sides, and the upper part is the upper stopper 21U. And the upper detector 15U.

The middle support column 5 is provided with an operating member 19 for operating the upper detector 15U slightly below the center of the top and bottom, and a movable contact 22 capable of contacting the upper stopper 21U is provided below the operating member 19. There is.
The lower detector 60 that limits the lower limit of the load receiving tool 7 is attached to the support 57 of the foundation support column 4, and the lower actuating member 61 that operates the lower detector 60 is attached to the load receiving device 7. When the lower actuating member 61 of the load receiving tool 7 reaches the lowest position, the lower detector 60 is actuated (detected) to stop the wire from being pulled out by the electric motor (12). The lower detector 60 may be attached to the foundation base 3 in addition to the foundation support 4.

The actuating member 19 is arranged at a position where the upper detector 15U is actuated when the middle support column 5 reaches the highest position, and when the actuating member 19 activates the upper detector 15U, the actuating member 19 hits the upper stopper 21U in a movable manner. It will collide with 22 and limit further climbs.
The movable hit 22 constitutes a resistance adding means 16, and has a resistance moving function that allows resistance while giving resistance to the middle support column 5 from contacting the upper stopper 21U until the rise is restricted.

The movable hit 22 is formed of a single plate material, is located on the front side of the middle support column 5, but can move relative to the middle stage support 5, and is formed on a T-shaped pedestal member 24 fixed to the front surface of the middle stage support 5. The coil springs 23 are fitted to the two bolts so as to be movable in opposition to each other via the two bolts, and the resistance adding means 16 is configured by these.
The resistance adding means 16 elastically projects a movable hit 22 from the pedestal member 24 via the coil spring 23 in the collision direction, and the coil spring 23 and the resistance member 23 imparting resistance to the ascent of the middle support column 5. It has become.

That is, even if the middle support column 5 is raised and the movable hit 22 comes into contact (collision) with the upper stopper 21U, the rise of the middle stage support column 5 cannot be stopped, and when the resistance member 23 is compressed to reach the limit, or the pedestal member When the top of the 24 collides with the movable hit 22, the ascent of the middle support column 5 is stopped for the first time. Therefore, the resistance (braking) of the resistance member 23 is applied to the rise of the middle support column 5 by a certain distance before reaching the upper limit position.

Since the multi-stage lifting device 1 has multi-stage columns from the foundation column 4 to the load receiving tool 7, when a load having a large load is placed on the load receiving device 7, excessive frictional resistance is applied particularly to the lower part of each column, and the column contracts. When the wire W is wound up by the electric winch drum 11 from the state, the middle support column 5 adjacent to the foundation support column 4 starts to rise first, and the middle stage support column 5 rises before the load receiving tool 7 and the upper stage support column 6 rise. There is a possibility that the upper detector 15U will be operated by rising to the upper limit and the drive of the winch drum 11 will be stopped.

However, as described above, by providing the resistance adding means 16, even if the middle column 5 adjacent to the foundation column 4 rises before the load receiving tool 7 and the upper column 6, the middle column 5 does not reach the upper limit. The brake is applied by receiving resistance from the resistance member 23, and the winding force of the wire W is transmitted to the load receiving tool 7 and the upper support column 6, and even if they receive excessive frictional resistance, the load receiving tool 7 overcomes it. Is raised, the upper support 6 is raised, and the middle support 5 of the second and third stages is raised.
After these reach the ascending limit, the winding force of the wire W can raise the first-stage middle support column 5 to the upper limit against the resistance force of the resistance member 23.

When the load loaded on the load receiving tool 7 is small or medium, when the wire W is wound up by the wire drive mechanism 8 from the support column contracted state of FIG. 2, the load receiving device 7 first moves to the upper support column 6 After the rise, the upper support 6 rises with respect to the first middle support 5, then the second middle support 5 rises, and finally the third middle support 5 is the foundation. After ascending with respect to the support column 4 and receiving the resistance of the resistance adding means 16, the operating member 19 of the third-stage middle stage support column 5 operates the upper detector 15U of the foundation support column 4 to ascend in the regular order. To complete.

The wire drive mechanism 8 by the electric motor 12 can be stopped at any time, the load receiving device 7 can be lifted to a required height, and an emergency stop is also possible.
The present invention is not limited to the above embodiment, and the shape, configuration, combination, and the like of the members can be changed.
For example, the upper stopper 21U may be provided on the middle support column 5, and the resistance adding means 16 having a movable contact 22, a pedestal member 24, and a resistance member 23 may be provided on the foundation support column 4. Further, the resistance member 23 of the resistance adding means 16 may be configured by arranging an elastic body such as a leaf spring or a damper between the pedestal member 24 and the movable contact 22.

A pair of left and right limit switches for the upper detector 15U are provided, but one may be used, and the upper detector 15U or the operating member 19 may be capable of adjusting the mounting position in the vertical direction.
Further, the support 57 and the electric motor 12 of the winch drum 11 of the wire drive mechanism 8 may also be mounted on the base 3 in the same manner as the battery 13.

1 Multi-stage lifting device 3 Foundation base 3A Main frame 3B Front frame 3C Leg frame 3D Stabilizer 4 Foundation support 4G Guide rail 5 Middle support 5G Middle guide rail 6 Upper support 6G Upper guide rail 7 Receiving device 8 Wire drive mechanism 11 winch drum 11a 12 Motor 13 Battery 15 Detector 15U Upper detector 16 Resistance adding means 19 Acting member 21 Stopper 21D Lower stopper 21U Upper stopper 22 Per movable 23 Resistance member (coil spring)
24 Pedestal member 26 Upper sheave 26a Rotating shaft 27 Lower sheave 27a Rotating shaft 31 Wheel 32 Auxiliary wheel 34 Hanger 35 Cover 40 Opening 41 Support bracket 42 Fixed bracket 43 Reinforcing rail 45 Bracket 52 Fork material 55 Sheave 57 Support 58 Control box 59 Operation controller 60 Lower detector 61 Lower actuating member 62 Adjuster 63 Lock pin DR Lower roller G Guide rail L Box part M Outer rail part N Inner rail part UR Upper roller W wire

Claims (9)

A foundation (3), a foundation support (4) fixed on the foundation (3), and at least one middle support (5) supported by the foundation support (4) so as to be vertically movable. An upper strut (6) movably supported by the middle strut (5), a load receiving tool (7) movably supported by the upper strut (6), and a foundation strut (4) to a middle strut. A wire is extended to the upper support column (6) via (5), and the wire (W) is pulled toward the foundation support column (4) to raise the load receiving tool (7) with respect to the upper support column (6). It is a multi-stage lifting device equipped with a wire drive mechanism (8) that raises the upper support column (6) with respect to the middle support column (5) and raises the middle stage support column (5) with respect to the foundation support column (4). hand,
The wire drive mechanism (8) has a winch drum (11) that winds up the base support column (4) side of the wire (W), and an electric motor (12) that rotationally drives the winch drum (11). A multi-stage lifting device characterized in that the drum (11) and the electric motor (12) are mounted on the lower part of the foundation column (4) or the foundation base (3). Between the foundation support (4) and the middle support (5) supported by the foundation support (4), it is detected that the middle support (5) has reached the highest position, and the wire is wound by the motor (12). The claim is characterized in that an upper detector (15U) for stopping and a resistance adding means (16) for giving an ascending resistance to the middle support column (5) before the upper detector (15U) detects the upper detector (15U) are provided. The multi-stage lifting device according to 1. The upper detector (15U) is provided on the upper part of the foundation support (4), and the middle support (5) is provided with an operating member (19) that operates the upper detector (15U) when the upper limit position is reached. The multi-stage lifting device according to claim 2, wherein the device is characterized by the above. The resistance adding means (16) includes an upper stopper (21U) provided on the foundation support (4) and a movable contact (22) provided on the middle support (5) and capable of colliding with the upper stopper (21U). 2. The movable contact (22) or the upper stopper (21U) has a resistance member (23) that elastically projects the collision surface in the collision direction, according to claim 2 or 3. Multi-stage lifting device. The foundation support (4), middle support (5), and upper support (6) each have an upper sheave (26) around which a wire (W) is wound, and the middle support (5) and upper support (6) And the load receiving tool (7) supported so as to be movable up and down on the upper column (6) has a lower sheave (27) around which the wire (W) is wound, and the tip of the wire (W) is the upper column. The multi-stage lifting device according to any one of claims 1 to 4, wherein the device is connected to the upper part of (6) or the load receiving device (7). The foundation support (4) has a guide rail (4G) long in the vertical direction and an upper roller (UR).
The middle column (5) is long in the vertical direction in which the lower roller (DR) that rolls in the guide rail (4G) of the foundation column (4) and the upper roller (UR) of the foundation column (4) roll. It has a middle guide rail (5G) and an upper roller (UR).
The upper column (6) has a lower roller (DR) that rolls in the middle guide rail (5G) and an upper guide rail (6G) that is long in the vertical direction in which the upper roller (UR) of the middle column (5) rolls. ) And
The one according to any one of claims 1 to 5, wherein the load receiving tool (7) has a pair of upper and lower rollers (UR, DR) that roll on an upper guide rail (6G). Multi-stage lifting device. The foundation support (4) is erected with respect to a substantially horizontal foundation (3) in a direction of escaping from the load receiving tool (7), and the foundation (3) is a wheel that moves in a substantially horizontal posture. (31), any one of claims 1 to 6, wherein the foundation support (4) has auxiliary wheels (32) that come into contact with the foundation when the foundation (3) is in a substantially vertical position. The multi-stage lifting device described in the section. The lower actuating member (61) is provided on the load receiving tool (7), and the electric motor (12) detects that the lower actuating member (61) of the load receiving tool (7) has reached the lowest lowered position on the foundation support column (4). The multi-stage elevating device according to any one of claims 1 to 7, wherein the lower detector (60) for stopping the wire drawing according to the above method is provided. The multi-stage lifting device according to any one of claims 1 to 8, wherein an adjuster (62) that can be grounded is provided in the lower portion of the left and right side portions of the foundation base (3).

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