JP2015196565A - Lifting platform device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile lifting platform device which may move up or down support legs in response to upward or downward movement of a scissors link mechanism.SOLUTION: A lifting platform device includes: a dolly part 2; a lifting drive device disposed at the inner side of the dolly part 2; a scissors link mechanism disposed above the dolly part 2; and a work table supported by the scissors link mechanism. The dolly part 2 includes: a substantially rectangle frame body 6; support legs 7 erected to the lower side at four corners of the frame body 6; lift arms 10, each of which is connected to the frame body 6 through an attachment shaft 27 and moves up and down the support leg 7; wheels 8 which enables the lifting platform device 1 to travel; and connection rods 9, each of which connects the left and right wheels 8. The scissors link mechanism includes pressing parts which respectively press the lift arms 10 to the lower side. Each lift arm 10 includes: a second resin roller 33 which is attached to the lift arm 10 through a receiving part shaft 34 so as to face and contact with a lower end of the pressing part; and a first resin roller 29 which is attached to the lift arm 10 through a fulcrum shaft 32 so as to contact with the connection rod 9.

Description

  TECHNICAL FIELD The present invention relates to a movable lifting platform used for indoor work, for example, at high places.

  Conventionally, as a lifting platform device with wheels used when working at high places inside and outside the room, when the work platform is raised, the support legs touch the floor and work to stabilize the lifting platform device. Japanese Patent Application Laid-Open Publication No. 2004-228561 discloses that when the table is lowered, the support leg is raised so that the elevator apparatus can be driven by wheels. When the link mechanism is contracted and the work table is lowered, this lifting / lowering device is configured such that the pressing member provided on the link mechanism contacts one end of the rod and pushes it down to pull the small link rod connected to the rod. As a fulcrum, a base or the like fixed to the other end of the rod is raised. On the other hand, in a state where the link mechanism is extended and the work table is raised, the pressing member is lifted with the extension of the link mechanism and is separated from the heel, and one end of the heel that has been pushed down is raised and the other end of the heel is By descending, the base or the like is lowered, and the support leg is grounded to the floor surface or the like.

Japanese Patent No. 3254673

  However, the lifting platform device disclosed in Patent Document 1 uses a small link rod as a fulcrum shaft component of the rod, is formed on the shaft of the connecting portion between the rod and the base, and the small link rod. Since the two shafts have different shapes, there are problems that the types of parts increase and the material cost and processing cost increase. In addition, since the base end of the ridge and the small link ridge that come into contact with the pressing member are metal members, metal corrosion such as rust is likely to occur, and when the metal corrosion occurs, there is a problem that the operation of the corroded portion deteriorates. .

  Therefore, the present invention reduces the type of parts and the number of parts by making the parts that make up the eaves part that raises and lowers the base and the like, and the operation due to metal corrosion of the parts by making some of the parts resin parts. The purpose is to prevent the deterioration.

  The lifting platform apparatus according to claim 1 is a carriage unit, a lifting drive unit disposed inside the carriage unit, a link mechanism disposed above the carriage unit, and an operation supported by the link mechanism. A platform unit, wherein the carriage unit has a substantially rectangular frame unit, a support unit standing downward at four corners of the frame unit, and an attachment shaft on the frame unit A lift arm that is connected and lifts up and down the support portion; a wheel portion that allows the lift platform device to travel; and a connecting portion that connects the left and right wheel portions; and the link mechanism moves the lift arm downward The lift arm has a pressing receiving portion attached via a receiving portion shaft so as to be in contact with a lower end of the pressing portion, and a fulcrum shaft so as to be in contact with the connecting portion. A fulcrum part attached via And butterflies.

  The lifting platform apparatus according to claim 2 is characterized in that the pressing receiving portion and the fulcrum portion are common parts.

  The lifting platform device according to claim 3 is characterized in that the press receiving portion and the fulcrum portion are resin members.

  The lifting platform apparatus according to claim 4 is characterized in that the lift arm has a linear shape.

  The lifting platform apparatus according to claim 5 is characterized in that the mounting shaft, the fulcrum shaft, and the receiving portion shaft are all common parts.

  According to the first aspect of the invention, the support leg can be raised and lowered in response to the raising and lowering of the link mechanism.

  According to invention of Claim 2, the kind of components can be reduced.

  According to the invention of claim 3, it is possible to prevent deterioration of the lifting and lowering operation of the support leg due to corrosion of the metal parts.

  According to the invention of claim 4, by making the shape of the lift arm simple, the processing can be facilitated and the strength can be increased.

  According to the invention of claim 5, the material cost and the processing cost can be kept low by sharing the parts.

It is a perspective view in the scissor link mechanism accommodation state of the raising / lowering platform apparatus which shows Example 1 of this invention. It is a perspective view in the state where the scissor link mechanism of the lifting platform device is extended. It is a right view in the scissors link mechanism accommodation state of an elevator base apparatus same as the above. It is a right side view in the state where the scissor link mechanism of the lifting platform device is extended. It is a perspective view of a cart part same as the above. It is a figure which shows the front-wheel part of the longitudinal cross-section in the scissors link mechanism accommodation state of an elevator base apparatus same as the above. It is a figure which shows the front-wheel part of the longitudinal cross-section in the expansion | extension state of the scissor link mechanism of an elevator base apparatus same as the above.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

  Hereinafter, Example 1 of the lifting platform device of the present invention will be described with reference to FIGS. The lifting platform device 1 of the present embodiment includes a carriage unit 2, a lifting drive device 3 disposed inside the carriage unit 2, and a scissor link mechanism 4 that is a link mechanism disposed above the carriage unit 2. And a workbench 5 supported by the scissor link mechanism 4.

  The cart unit 2 includes a frame body 6 assembled in a rectangular shape, four support legs 7 which are support units erected downward at the four corners of the frame body 6, and wheel units disposed below the frame body 6. , Four front and rear connecting rods 9 that are connecting portions for connecting the left and right wheels 8, and four lift arms 10 connected to the frame body 6. The support leg 7 is a so-called outrigger, and has a function of suppressing the swing of the lifting platform device 1 during work. Moreover, the support leg 7 can be pulled out in the left-right direction, and if it is used in the pulled-out state, the lifting platform device 1 can be made more stable. FIG. 1 shows a state in which the support leg 7 is stored, and FIG. 2 shows a state in which the support leg 7 is pulled out.

  The frame 6 includes a front frame 11, a rear frame 12, a left frame 13, and a right frame 14, and a short cylindrical bearing portion 15 for connecting the lift arm 10 to the front frame 11 on the rear side. Two places are provided so as to protrude. The rear frame 12 is also provided with two bearing portions 15 for connecting the lift arm 10 so as to protrude forward. The rear bearing portion 15 is provided close to the left frame 13 and the right frame 14, but the front bearing portion 15 is provided inside the rear bearing portion 15. This is adjusted so that the second resin roller 33 and the pressing portion 35 described later face each other.

  The front wheel 16 that is the front wheel 8 is a so-called caster, and is rotatable in the left-right direction. On the other hand, the rear wheel 17 which is the rear wheel 8 cannot be rotated in the left-right direction. Therefore, the elevator platform device 1 of the present embodiment enables the direction change by the front wheel 16.

  The wheel 8 is attached to a lower portion of a rectangular cylindrical wheel holding portion 18. The wheel holding part 18 is inserted into rectangular tubular insertion rods 19 provided at two positions on the outside of the left frame 13 and the right frame 14 respectively, and the wheel holding unit 18 and the insertion rod 19 are relatively positioned. It can be moved up and down. At the upper end of the wheel holding portion 18, a plate-shaped retaining plate 20 that prevents the wheel holding portion 18 from coming off from the insertion rod 19 is formed. Further, on the upper surface of the retaining plate 20, an annular hooking portion 21 is formed for inserting a wire or the like when the lifting platform device 1 is lifted by a crane or the like.

  The left and right wheel holding portions 18 are connected to each other by a connecting rod 9 below the insertion rod 19. A plate-like stopper holding portion 22 that protrudes forward is formed on the front connecting rod 9, and a stopper 23 that restricts the floating of the lifting platform device 1 is disposed below the stopper holding portion 22. . The stopper 23 can be moved up and down by the operator operating the stopper lever 24. When the stopper 23 is lowered, the stopper 23 comes into contact with the floor surface and the like, and the movement of the lifting platform device 1 can be restricted.

  Next, the lift arm 10 will be described with reference to FIG. The lift arm 10 has a configuration in which two straight plate-like thin plate portions 25 are opposed to each other and connected by a rectangular plate-like partition plate portion 26, and both ends of the thin plate portion 25 are convex outward. It is formed in a semicircular shape. The thin plate portion 25 is rotatably connected to the bearing portion 15 via the mounting shaft 27 with the bearing portion 15 interposed therebetween. Further, on the bearing portion 15 side of the thin plate portion 25, there is a rotation restricting portion 28 that connects the two thin plate portions 25 up and down and prevents the lift arm 10 from rotating more than a certain amount in the vertical direction. Is formed. When the lift arm 10 is rotated in the vertical direction, the rotation restricting portion 28 comes into contact with the bearing portion 15, and the lift arm 10 is prevented from further rotating.

  A first resin roller 29 that is a fulcrum portion of the lift arm 10 is attached to the thin plate portion 25 via a fulcrum shaft 32 between the partition plate portion 26 and the rotation restricting portion 28. The first resin roller 29 has a cylindrical shape, and a shaft hole (not shown) through which the fulcrum shaft 32 is inserted is formed at the center in the diameter direction. Further, a chamfered portion 30 is formed at the outer peripheral corner portion in the diameter direction, and a circular thick portion 31 having a circular thickness is formed around the shaft hole.

  When the support leg 7 is moved up and down, the first resin roller 29 comes into contact with the upper surface of the connecting rod 9, and the front and rear of the lift arm 10 move up and down using the first resin roller 29 as a fulcrum. The first resin roller 29 is rotatably attached to the thin plate portion 25 via the fulcrum shaft 32 and can smoothly roll on the upper surface of the connecting rod 9 in conjunction with the movement of the lift arm 10. it can.

  A second resin roller 33 that is a pressure receiving portion is rotatably attached to the thin plate portion 25 via a receiving portion shaft 34 at the end of the lift arm 10 on the side opposite to the bearing portion 15. The second resin roller 33 is pressed by the pressing portion 35 provided in the scissor link mechanism 4 when the work table 5 is lowered, and functions as a power point of a so-called lever principle.

  The first resin roller 29 and the second resin roller 33 use the same parts. The attachment shaft 27 and the fulcrum shaft 32 receiving portion shaft 34 use the same parts. In this way, by making parts common and reducing the types of parts, the manufacturing cost can be kept low.

  The lifting / lowering drive device 3 is disposed inside the frame body 6 and is attached to the left frame 13 and the right frame 14. When the scissor link mechanism 4 is housed, the lift drive device 3 is lifted together with the support legs 7 and the like. . The elevating drive device 3 includes a hydraulic unit (not shown) such as a motor, a pump, a valve, and a tank, and elongates and lowers the work table 5 by expanding and contracting the scissor link mechanism 4. The work table 5 is provided with an operation unit 36 for operating the elevating drive device 3 so that the operator can perform the elevating operation of the work table 5 while being on the work table 5. The elevating drive device 3 and the operation unit 36 are connected via a cable 37.

  Next, the scissor link mechanism 4 will be described with reference to FIG. The scissor link mechanism 4 is a three-stage link mechanism, and six sets of the lower-stage inner link 38 and the lower-stage outer link 39, the middle-stage inner link 40 and the middle-stage outer link 41, the upper-stage inner link 42 and the upper-stage outer link 43 are left and right. Each is arranged. Then, the intersection of the lower inner link 38 and the lower outer link 39, the intersection of the upper inner link 42 and the upper outer link 43, the connecting portion of the lower inner link 38 and the middle outer link 41, the lower outer link 39 and the middle inner link 40. The connecting portion between the middle stage inner link 40 and the upper stage outer link 43 and the connecting portion between the middle stage outer link 41 and the upper stage inner link 42 are pivotally supported by the pivot shaft 44 in an integral manner. Further, the intersection of the middle inner link 40 and the middle outer link 41 is pivotally supported by the short pivot shaft 45 separately on the left and right. The number of stages of scissor link mechanism 4 can be changed as appropriate.

  The lower end of the lower inner link 38 is rotatably attached to the rear end inside of the left frame 13 and the right frame 14. Further, a lower sliding roller 47 made of resin that slides on a lower groove portion 46 formed inside the left frame 13 and the right frame 14 is rotatably attached to the lower end of the lower outer link 39. When the scissor link mechanism 4 is folded, the lower sliding roller 47 moves forward, and when the scissor link mechanism 4 is raised, the lower sliding roller 47 moves rearward.

  The left and right lower inner links 38 and the left and right upper inner links 40 are connected by a hydraulic cylinder 48. When the hydraulic cylinder 48 contracts, the scissor link mechanism 4 is folded, and when the hydraulic cylinder 48 extends, the scissor link mechanism 4 rises. It is like that. The hydraulic cylinder 48 expands and contracts by sending and receiving pressure oil to and from the elevating drive device 3.

  The upper end of the upper outer link 43 is rotatably attached to the rear end of the bottom surface of the work table 5. A resin upper sliding roller 50 that slides in upper groove portions 49 formed on the left and right sides of the work table 5 is rotatably attached to the upper end of the upper inner link 42. When the scissor link mechanism 4 is folded, the lower sliding roller 47 moves forward, and when the scissor link mechanism 4 is raised, the lower sliding roller 47 moves rearward.

  A substantially rectangular pressing portion 35 that presses the second resin roller 33 downward when the scissor link mechanism 4 is folded is formed on the lower surface of the left and right lower inner links 38 and the lower surface of the left and lower lower outer links 39. ing.

  The work table 5 is composed of a rectangular bottom plate portion 51 and a fall prevention fence 52 for preventing fall provided on the bottom plate portion 51. A door 53 for allowing an operator to get on and off the workbench 5 is disposed at the front portion of the fall prevention fence 52 so as to be freely opened and closed. In addition, a plate-shaped footrest portion 54 is formed at the front end of the left and right lower inner links 38 so that the operator can get on the platform 5 when getting on and off the worktable 5. The operation unit 36 is detachably locked to the fall prevention fence 52.

  Next, the raising / lowering of the support leg 7 is demonstrated based on FIG. 6 and FIG. FIG. 6 shows a state where the scissor link mechanism 4 is folded and the work table 5 is lowered, and the pressing portion 35 pushes down the second resin roller 33 downward. When the second resin roller 33 is pushed down, the first resin roller 29 functions as a fulcrum of the lever principle in a state where the first resin roller 29 is in contact with the connecting rod 9, and the bearing portion 15 side of the lift arm 10 is lifted. Then, the lower rotation restricting portion 28 comes into contact with the bearing portion 15 to lift the bearing portion 15, and the support leg 7 connected to the bearing portion 15 through the frame body 6 is lifted. At this time, since the wheel holding part 18 is only inserted through the insertion rod 19 and is not fixed to the frame body 6, the wheel 8 and the wheel holding part 18 do not rise, and the wheel 8 is grounded to the floor surface or the like. Will remain.

  FIG. 7 shows a state in which the scissor link mechanism 4 is extended and the work table 5 is raised, and the pressing portion 35 is lifted together with the scissor link mechanism 4 and separated from the second resin roller 33. In this state, since the pressing of the pressing portion 35 against the second resin roller 33 is released, the bearing portion 15 side of the lift arm 10 is lowered by the weight of the elevating drive device 3 and the support leg 7 connected to the frame body 6. The support leg 7 descends and touches the floor or the like.

  Thus, in the state where the scissor link mechanism 4 is folded, the support leg 7 is lifted away from the floor or the like, so that the lifting platform device 1 can be easily traveled. In this state, the lifting platform device 1 is moved to the place of use, and the stopper 23 is lowered to come into contact with the floor or the like, thereby restricting the lifting platform device 1 from floating. When the scissor link mechanism 4 is extended by the elevating drive device 3 after the support leg 7 is pulled left and right, the pressing portion 35 gradually rises, and the support leg 7 gradually falls due to its own weight, The support leg 7 contacts the floor surface or the like. Since all the support legs 7 at the four corners are in contact with the floor surface or the like, swinging of the lifting platform 1 can be reduced and stably held, and work can be performed safely.

  As described above, in this embodiment, the carriage unit 2, the elevating drive device 3 disposed inside the carriage unit 2, and the scissor link mechanism 4 that is a link mechanism disposed above the carriage unit 2 are provided. , And a platform 5 supported by the scissor link mechanism 4, wherein the carriage unit 2 includes a frame 6 that is a substantially rectangular frame, and a frame 6. Support legs 7 that are support portions standing downward at the four corners, a lift arm 10 that is connected to the frame body 6 and raises and lowers the frame body 6 and the support legs 7 about a fulcrum shaft 32, and a lifting platform device 1 and a connecting rod 9 that connects the left and right wheels 8, and the scissor link mechanism 4 presses the lift arm 10 downward. A pressing portion 35 is provided, and the lift arm 10 is A second resin roller 33 that is a pressure receiving portion provided so as to be in contact with the lower end of the portion 35, and a first resin roller 29 that is a fulcrum portion provided so as to be in contact with the connecting rod 9. Accordingly, it is possible to provide a movable lifting platform device 1 capable of moving the support leg 7 up and down in response to the lifting and lowering of the scissor link mechanism 4.

  Further, in this embodiment, since the second resin roller 33 and the first resin roller 29 are common parts, the types of parts can be reduced.

  Further, in this embodiment, since the second resin roller 33 and the first resin roller 29 are resin members, corrosion such as rust does not occur unlike metal parts, and the support leg 7 is raised and lowered by corrosion. Deterioration of operation can be prevented.

  In the present embodiment, the lift arm 10 has a linear shape, so that the processing is easy and the strength can be increased.

  Further, in this embodiment, since the mounting shaft 27, the fulcrum shaft 32, and the receiving shaft 34 are all common parts, the material parts and the processing cost can be reduced by making the shaft parts common. Can be suppressed.

  In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the traveling movement of the lifting platform according to the embodiment is based on human power, but may be a self-propelled type driven by a motor. It is also possible to mount a safety device such as a vehicle body tilt warning device or an overload prevention device.

DESCRIPTION OF SYMBOLS 1 Lifting platform apparatus 2 Carriage part 3 Lifting drive apparatus 4 Scissor link mechanism (link mechanism)
5 Working table 6 Frame (frame part)
7 Support legs (support part)
8 wheels (wheel part)
9 Linkage (connection part)
10 Lift arm 27 Mounting shaft 29 First resin roller (fulcrum)
32 fulcrum shaft 33 second resin roller (press receiving part)
34 Receiving part shaft 35 Pressing part

Claims (5)

A cart section;
Elevating and lowering drive device disposed inside the carriage unit;
A link mechanism disposed above the carriage unit;
A work platform supported by the link mechanism, and a lifting platform device comprising:
The cart part is a substantially rectangular frame part, a support part erected downward at the four corners of the frame part, a lift arm connected to the frame part via an attachment shaft, and raising and lowering the support part, A wheel portion that allows the elevator device to travel, and a connecting portion that connects the left and right wheel portions,
The link mechanism includes a pressing portion that presses the lift arm downward,
The lift arm has a pressure receiving part attached via a receiving part shaft so as to be in contact with the lower end of the pressing part, and a fulcrum part attached via a fulcrum shaft so as to be in contact with the connecting part, A lifting platform device comprising:   2. The lifting platform device according to claim 1, wherein the pressing receiving portion and the fulcrum portion are common parts.   The elevator apparatus according to claim 1 or 2, wherein the pressing receiving portion and the fulcrum portion are resin members.   The lifting platform device according to any one of claims 1 to 3, wherein the lift arm has a linear shape.   The lifting / lowering platform apparatus according to any one of claims 1 to 4, wherein the mounting shaft, the fulcrum shaft, and the receiving portion shaft are all common parts.

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