JP2017114627A - Elevating bench device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevating bench device of which oscillation is small when elevating a work bench.SOLUTION: An elevating bench device comprising a truck body 2 equipped with a wheel 3 for travel, a linkage 5 provided on an upper part of the truck body 2, a work bench 4 provided on an upper part of the linkage 5, and a hydraulic cylinder 6 provided on the truck body 2. Since the hydraulic cylinder 6 is connected to a pivot shaft 36A provided at an upper end part of a lower stage outer link rod 32 and/or a pivot shaft 36B provided at an upper end part of an upper stage outer link rod 34 which constitute the linkage 5, the linkage 5b is held at a high position.SELECTED DRAWING: Figure 7

Description

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

  2. Description of the Related Art Conventionally, a lifting platform device described in Patent Document 1 is known as a movable work table used when working at a high place indoors or outdoors. This lifting platform device lifts and lowers a work table on which an operator is boarded by a link mechanism. The link mechanism is configured to expand and contract in the vertical direction by expansion and contraction of the hydraulic cylinder, and this hydraulic cylinder is provided so as to expand and contract in an oblique direction with respect to the vertical direction in which the work table moves up and down.

  Further, the upper end of the rod constituting the hydraulic cylinder is connected slightly above the first pivot provided on the lower link rod. The hydraulic cylinder not only extends and contracts the link mechanism, but also has a function of holding the link mechanism and reducing shaking when the work table is raised and lowered.

JP 2008-56459 A

  As described above, since the hydraulic cylinder of Patent Document 1 is provided so as to extend and contract in an oblique direction with respect to the vertical direction in which the link mechanism extends and contracts, a part of the output of the hydraulic cylinder is linked by the inclination of the hydraulic cylinder. It was not used to expand and contract the mechanism in the vertical direction, and wasted. Therefore, a hydraulic cylinder with a large output is required to expand and contract the link mechanism, a large and expensive hydraulic cylinder must be used, the weight of the entire lifting platform device becomes heavy, and the manufacturing cost of the lifting platform device There was a problem of rising.

  In addition, the upper end of the rod, which is the expansion / contraction part of the hydraulic cylinder, is connected below the upper end of the lower link rod that constitutes the link mechanism, and the member that holds the link rod and the workbench above it. Is not provided, the holding effect of the link mechanism by the hydraulic cylinder is small, and there is a problem that the shaking becomes large when the work table is raised and lowered.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems and to provide a lifting / lowering table device that is less swayed when the work table is lifted / lowered, and that is reduced in weight and cost.

  The lifting platform device according to the invention described in claim 1 is a cart body provided with traveling wheels, a link mechanism provided at an upper part of the cart body, a work table provided at an upper part of the link mechanism, And elevating means provided on the main body of the carriage, wherein the elevating means is connected to a pivot shaft provided at an upper end portion of a link rod constituting the link mechanism.

  According to a second aspect of the present invention, the elevator platform device has a two-stage configuration in which the link mechanism is composed of an upper link rod and a lower link rod, and the lifting means is arranged at the upper end of the upper link rod. It is connected with the pivot shaft provided in the pivot shaft provided in the upper end part of the lower link rod provided with the pivot shaft.

  A lifting platform according to a third aspect of the present invention is characterized in that the lifting means is a cylindrical hydraulic cylinder that expands and contracts in the vertical direction.

  According to a fourth aspect of the present invention, the lifting platform includes a cover member that covers the hydraulic cylinder.

  According to the first aspect of the present invention, it is possible to reduce shaking when the work table is raised and lowered.

  According to invention of Claim 2, the shaking at the time of raising / lowering a work bench | platform can further be reduced.

  According to invention of Claim 3, compared with the case where it arrange | positions so that a hydraulic cylinder may be extended-contracted diagonally, a work bench can be raised / lowered with weak force.

  According to invention of Claim 4, it can prevent that the oil currently used for the hydraulic cylinder splashes outside.

It is a right view of the raising / lowering platform apparatus of the state which extended the link mechanism which shows Example 1 of this invention. FIG. 3 is a right side view of the lifting platform device in a state where the link mechanism is contracted. It is a front view of the raising / lowering platform apparatus of the state which contracted the link mechanism. It is a rear view of the raising / lowering platform apparatus of the state which contracted the link mechanism. It is a front view of the raising / lowering platform apparatus of the state which extended the link mechanism equally. It is a rear view of the raising / lowering platform apparatus of the state which extended the link mechanism equally. It is a right view of the raising / lowering platform apparatus of the state which extended the link mechanism which shows Example 2 of this invention. FIG. 3 is a left side view of the lifting platform device in a state where the link mechanism is contracted. (A) is a longitudinal cross-sectional view of the raising / lowering means which shows Example 2 of this invention, (B) is AA sectional drawing of the raising / lowering means which shows Example 2 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 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. In the embodiment, the upper, lower, left, and right of FIG. 1 are the upper side, lower side, front side, and rear side, respectively, and the front side of the paper of FIG. Will be described as the right side.

  In FIG. 1 to FIG. 6, reference numeral 1 denotes a lifting / lowering platform device. The lifting / lowering platform device 1 supports a carriage body 2, a traveling wheel 3, a worktable 4 on which an operator gets on, and a worktable 4. And a hydraulic cylinder 6 as an elevating device for raising and lowering the link mechanism 5.

  The cart body 2 is formed in a substantially rectangular frame shape in plan view, which includes a front rod 11, a rear rod 12, a left rod 13, and a right rod (not shown). A lower rail 15, which is a concave rail on which a lower sliding roller 36 provided in the link mechanism 5 rolls, is provided on the upper surface of the left side rod 13 and the right side rod. The left and right lower rails 15 are open on the inner side in the left-right direction.

  A front wheel mounting frame 16 for fixing a front wheel 3A, which is a front wheel 3, is bridged on the left side rod 13 and the front lower surface of the right side rod, and a wheel shaft 17 of the front wheel 3A is fixed to the front wheel mounting frame 16. Front wheels 3 </ b> A are rotatably attached to the left and right ends of the wheel shaft 17. The front wheel 3A rotates in the front-rear direction and does not rotate in the left-right direction. On the other hand, a rear wheel mounting frame 18 for fixing the rear wheel 3B as the rear wheel 3 is bridged on the rear side lower surface of the left side rod 13 and the right side rod, and the rear wheel is mounted on the lower surface of the rear wheel mounting frame 18. 3B is attached to the left and right respectively. Since the rear wheel 3B is a so-called caster, the rear wheel 3B can be rotated in a horizontal direction of 360 °, and the rear wheel 3B can change the direction when the lifting platform device 1 is moved.

  The work table 4 includes a rectangular bottom plate portion 21 and a fall prevention fence 22 erected on the top. An operator gets on the bottom plate portion 21, and the fall prevention fence 22 prevents the operator from dropping from the work table 4 and is used as a handrail. A plate-shaped protective plate 23 is provided on the front side of the fall prevention fence 22. The protective plate 23 prevents the operator from taking out his / her limbs and the like from the gap of the fall prevention fence 22, and the worker is sandwiched between the fall prevention fence 22 and a second square pipe 44 described later. Is prevented. A door 24 for allowing an operator to get on and off the work table 4 is disposed at the rear of the fall prevention fence 22 so as to be freely opened and closed. The door 24 is provided with a grip portion 25 that is held by an operator or the like when the door 24 is opened or closed. Further, a shelf 26 in the shape of a rectangular plate in a plan view protruding forward is provided at the front portion of the fall prevention fence 22.

  On the left and right sides of the bottom surface of the bottom plate portion 21, an upper rail 27, which is a concave rail on which an upper sliding roller 37 provided in the link mechanism 5 rolls, is provided. The left and right upper rails 27 are open on the inner side in the left-right direction.

  Next, the link mechanism 5 will be described with reference to FIG. The link mechanism 5 of the present embodiment has a two-stage configuration, and includes a lower inner link rod 31 and a lower outer link rod 32 as lower link rods, an upper inner link rod 33 and an upper outer link rod 34 as upper link rods. These two sets of 4 are arranged on the left and right respectively. A shaft hole 35 is formed in each of the upper, middle, and lower ends of each link rod 31, 32, 33, and 34. And, the lower end portion of the lower inner link rod 31, the lower end portion of the lower outer link rod 32, the intersection of the lower inner link rod 31 and the lower outer link rod 32, the connecting portion of the lower inner link rod 31 and the upper outer link rod 34, The connecting portion between the lower outer link rod 32 and the upper inner link rod 33, the intersection of the upper inner link rod 33 and the upper outer link rod 34, the upper end portion of the upper inner link rod 33, and the upper end portion of the upper outer link rod 34 are respectively The left and right link rods 31, 32, 33, and 34 are pivotally supported integrally by inserting the pivot shaft 36 through the shaft hole 35. The number of stages of the link mechanism 5 can be changed as appropriate.

  A lower end of the lower inner link rod 31 is rotatably attached to a lower fixing plate 19 erected on the left side rod 13 and the front end upper surface of the right side rod. A lower sliding roller 37 made of resin that slides in the lower rail 15 is rotatably attached to the lower end of the lower outer link rod 32. When the link mechanism 4 is folded, the lower sliding roller 37 rolls backward, and when the link mechanism 4 is raised, the lower sliding roller 37 rolls forward.

  The upper end of the upper outer link rod 34 is rotatably attached to an upper fixing plate 28 that is erected downward on the front side of the lower surface of the bottom plate portion 21. A resin upper sliding roller 38 that slides in the upper rail 27 is rotatably attached to the upper end of the upper inner link rod 33. When the link mechanism 4 is folded, the upper sliding roller 38 rolls backward, and when the link mechanism 4 is raised, the upper sliding roller 37 rolls forward.

  As shown in FIGS. 1 and 2, the hydraulic cylinder 6 is a so-called double-acting cylinder, and has a piston (not shown) fitted in a cylindrical cylinder 41 and a columnar shape connected to the piston 41. And a rod 42. One end of a hydraulic hose (not shown) for supplying oil into the cylinder 41 and extracting the oil from the cylinder 41 is connected to the lower portion of the cylinder 41, and the other end of the hydraulic hose is supplied with oil. A hydraulic pump (not shown) and an oil tank (not shown) for storing oil are connected. The hydraulic cylinder 6 may be selected such that the total length of the rod 42 protruding from the cylinder 41 and the length of the cylinder 41 is longer than the upper limit of the height at which the work table 4 is raised.

  The lower end of the cylinder 41 is fixed to the upper surface of the front rod 11, and the cylinder 41 is erected vertically. As the piston in the cylinder 41 slides upward, the rod 42 projects from the upper end opening of the cylinder 41. The cylinder 41 is covered with a first square pipe 43 that is a rectangular tube having an open top and bottom, and the lower end of the first square pipe 43 is fixed to the upper surface of the front wing 11 like the cylinder 41. Yes. The first square pipe 43 is formed longer than the cylinder 41, and the cylinder 41 does not protrude from the upper part of the first square pipe 43 in a state where the cylinder 41 and the first square pipe 43 are fixed to the front rod 11. .

  The first square pipe 43 is covered with a second square pipe 44 that is a rectangular tube pipe that is open at the top and bottom. The upper opening of the second square pipe 44 is closed by the first lid 45, and the upper end of the rod 42 is fixed to the first lid 45. Therefore, when the rod 42 is raised, the second square pipe 44 fixed to the rod 42 is also raised at the same time. The second square pipe 44 is formed by adjusting the length so as to cover a part of the upper side of the first square pipe 43 even when the rod 42 is in the uppermost position. As a result, the hydraulic cylinder 6 is completely covered by the first square pipe 43 and the second square pipe 44 not only in the contracted state but also in the extended state. The oil used in the cylinder 6 can be prevented from scattering to the outside, and when the lifting / lowering table device 1 is used indoors, it is possible to prevent the indoors from being stained with oil.

  As shown in FIG. 1, thin plate-like first link fixing plates 46 are provided on the left and right side surfaces of the lower end portion of the second square pipe 44. The first link fixing plate 46 extends toward the link mechanism 5 side, that is, toward the rear side of the lifting platform device 1, and a first through hole 47 is formed at the rear end of the first link fixing plate 46. A pivot shaft 36 </ b> A that is a pivot shaft 36 inserted through the connecting portion between the lower outer link 32 and the upper inner link 33 is inserted into the first through hole 47. As a result, the second square pipe 44 and the hydraulic cylinder 6 are connected to the link mechanism 5.

  As shown in FIG. 2, the pipe lower end 48, which is the lower end of the second square pipe 44, does not contact the cart body 2 even when the link mechanism 5 is folded. Further, in this state, the first lid 45 and the first square pipe 43 do not contact each other, and a part of the upper side of the rod 42 protrudes from the first square pipe 43.

  Below the carriage main body 2, a control unit 7 that drives the hydraulic cylinder 6 and moves the link mechanism 5 up and down is disposed. The control unit 7 may be provided on the lower surface of the bottom plate part 21 or the like. However, by providing the control unit 7 below the carriage main body 2, the center of gravity of the lifting platform device 1 is lowered and Shake can be reduced. The control unit 7 is connected to an operation unit (not shown) that allows the operator to perform operations such as raising, lowering, and stopping the operation of the work table 4 while on the work table 4. The operation unit is detachably locked to the fall prevention fence 22 and the shelf 26.

  Next, the effect | action is demonstrated about the said structure. First, the elevator platform device 1 is moved to a desired position in a state in which the link mechanism 5 is folded, and the stopper 20 disposed on the lower surface of the cart body 2 behind the rear wheel 3B is grounded to the floor surface. It fixes so that the lifting platform apparatus 1 may not float. Thereafter, when an operator gets on the work table 4 from the door 24 and operates the operation unit so as to raise the work table 4, oil is supplied into the hydraulic cylinder 6 and the rod 42 is raised. The second square pipe 44 is raised, the pivot shaft 36A inserted through the first through hole 47 is pulled upward, the lower sliding roller 36 rolls forward in the lower rail 15, and the upper The sliding roller 37 rolls forward in the upper rail 27, and the link mechanism 5 rises. The operator can perform work by raising the work table 4 to a desired height and then operating the operation unit to stop the work table 4 from being raised.

  When the work table 4 is lowered after the work is finished or the like, the operator operates the operation portion to discharge the oil from the hydraulic cylinder 6 and the rod 42 is lowered. Accordingly, the second square pipe 44 is lowered. Is lowered, the pivot shaft 36A inserted through the first through hole 47 is pulled downward, the lower sliding roller 36 rolls backward in the lower rail 15, and the upper sliding roller 37 The link mechanism 5 is folded by rolling backward in the upper rail 27.

  In the present embodiment, the hydraulic cylinder 6 is provided alone, but a plurality of the hydraulic cylinders 6 may be provided on the upper surface of the front wing 11 in parallel in the left-right direction. It is good also as a structure arrange | positioned before and behind the apparatus 1. FIG. By providing a plurality of hydraulic cylinders 6, it is possible to reduce shaking of the work table 4 when the work table 4 is raised and lowered.

  As described above, the lifting platform device of the present embodiment is provided with the carriage main body 2 including the traveling wheels 3, the link mechanism 5 provided on the upper part of the carriage main body 2, and the upper part of the link mechanism 5. A work table 4 and a hydraulic cylinder 6 as lifting means provided on the cart body 2 are provided, and the hydraulic cylinder 6 is provided at an upper end portion of a lower outer link rod 32 as a link rod constituting the link mechanism 5. Since the upper part of the link mechanism 5 is held by the hydraulic cylinder 6 by being connected to the pivot shaft 35A, it is possible to reduce the shaking of the work table 4 and the link mechanism 5 when the work table 4 is raised and lowered.

  Further, since the lifting means is a cylindrical hydraulic cylinder 6 that expands and contracts in the vertical direction, the link mechanism 5 can be efficiently expanded and contracted by the hydraulic cylinder 6. Therefore, it is not necessary to use a huge and expensive hydraulic cylinder 6 that outputs a large force, the weight of the lifting / lowering table device 1 can be reduced, and the manufacturing cost of the lifting / lowering table device 1 can be reduced.

  Further, the lifting means includes a first square pipe 43 and a second square pipe 44 as cover members that cover the hydraulic cylinder 6, thereby covering the hydraulic cylinder 6 and being used for the hydraulic cylinder 6. It is possible to prevent oil from splashing outside. Thereby, even if it is a case where the raising / lowering platform apparatus 1 is used indoors, the room is not polluted with the oil currently used for the hydraulic cylinder 6. FIG.

  7 to 9 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this embodiment, the second square pipe 44 is covered with a third square pipe 51, and the third square pipe 51 and the link mechanism 5 are connected.

  FIG. 9B is a longitudinal sectional view of the hydraulic cylinder 6 and the like as seen from the front side of the elevator platform device 1. The second square pipe 44 is a rectangular tube with the upper part closed and the lower part opened. It is covered with a certain third square pipe 51. Thin plate-like second link fixing plates 52 are provided on both the left and right sides of the lower end portion of the third square pipe 51. The second link fixing plate 52 is extended toward the link mechanism 5 side, that is, the rear side of the lifting platform device 1, and a second through hole 53 is formed at the rear end of the second link fixing plate 52. A pivot shaft 36 </ b> B, which is a pivot shaft 36 inserted through a shaft hole 35 formed in the upper end portion of the upper outer link 34, is inserted into the second through hole 53. That is, the third square pipe 51 is connected to the link mechanism 5 via the second link fixing plate 52.

  As shown in FIG. 9, a sprocket 55 is provided on the upper surface of the first lid 45 that closes the upper opening of the second square pipe 44 by a fixture 54 so as to be rotatable about its axis. A roller chain 56 is engaged with the sprocket 55. One sprocket 55 and one roller chain 56 are provided on each side.

  One end of the roller chain 56 is inserted into a chain hole 57 provided in the first lid 45 and fixed to a one-side fixing body 58 provided on the side surface of the first square pipe 43. The other end of 56 is fixed to the other side fixing body 59 provided on the side surface of the third square pipe 51. The left and right roller chains 56 have the same length and are stretched so that there is no slack. Since the first square pipe 43 is fixed to the carriage main body 2, when the second square pipe 44 rises, the distance from the sprocket 55 to the one-side fixed body 58 increases and from the sprocket 55 to the other-side fixed body 59. When the second square pipe 44 is lowered, the distance from the sprocket 55 to the one-side fixed body 58 is shortened and the distance from the sprocket 55 to the other-side fixed body 59 is increased. That is, the third square pipe 51 moves up and down in conjunction with the second square pipe 44.

  Here, the operation of the hydraulic cylinder 6, the second square pipe 44, and the third square pipe 51 as lifting means of the present embodiment will be described. As shown in FIG. 8, when the rod 42 of the hydraulic cylinder 6 is raised from the state where the work table 4 is at the lowest position, the second square pipe 44 rises and the sprocket 55 meshed with the roller chain 56 is centered on the axis. Rotate counterclockwise and the third square pipe 51 rises. On the other hand, as shown in FIG. 7, when the rod 42 of the hydraulic cylinder 6 is lowered from the state where the work table 4 is at the uppermost position, the second square pipe 44 is lowered, and the sprocket 55 meshed with the roller chain 56 is pivoted. It rotates clockwise around the center, and the third square pipe 51 descends. When the work table 4 is raised, the roller chain 56 has a longer distance from the sprocket 55 to the one side fixed body 58 and a shorter distance from the sprocket 55 to the other side fixed body 59, and the work table 4 is lowered. In addition, the distance from the sprocket 55 to the one side fixed body 58 is shortened, and the distance from the sprocket 55 to the other side fixed body 59 is increased.

  In this way, when the hydraulic cylinder 6 is extended, the second square pipe 44 and the third square pipe 51 rise simultaneously, and the pivot shaft 36A is pulled upward by the second corner pipe 44. 36B is pulled upward by the third square pipe 51. That is, the lower outer link rod 32 and the upper outer link rod 34 are configured to rise simultaneously, but the ratio of the rising distance of the third square pipe 51 to the rising distance of the second square pipe 44 is 1: 2. Therefore, the second square pipe 44 and the third square pipe 51 reach the uppermost position at the same time when the hydraulic cylinder 6 is most extended. Further, the second square pipe 44 and the third square pipe 51 simultaneously reach the lowest position when the hydraulic cylinder 6 contracts most. Note that the length of the third square pipe 51 is adjusted so as to partially cover the upper part of the second square pipe 44 even when the hydraulic cylinder 6 is in the most extended position.

  In this embodiment, the link mechanism 5 and the hydraulic cylinder 6 are connected to each other at two locations of the first link fixing plate 46 and the second link fixing plate 52, but the first link fixing plate 46 is not provided. Alternatively, the link mechanism 5 and the hydraulic cylinder 6 may be connected only by the second link fixing plate 52. Since the second link fixing plate 52 is connected to the uppermost end portion of the link mechanism 5, the link mechanism 5 and the hydraulic cylinder 6 can be connected only by the second link fixing plate 52. The shaking at the time of raising and lowering can be sufficiently reduced.

  Also in this embodiment, the hydraulic cylinder 6 is provided independently as in the first embodiment. However, a plurality of hydraulic cylinders 6 may be provided on the upper surface of the front wing 11 in parallel in the left-right direction. It is good also as a structure which is provided also on the upper surface and arrange | positioned before and after the lifting platform apparatus 1. FIG. By providing a plurality of hydraulic cylinders 6, it is possible to reduce shaking of the work table 4 when the work table 4 is raised and lowered.

  As described above, in the lifting platform device of the present embodiment, the link mechanism 5 has the upper inner link rod 33 and the upper outer link rod 34 as the upper link rod and the lower inner link rod 31 and the lower outer layer as the lower link rod. The hydraulic cylinder 6 is provided at the upper end portion of the lower outer link rod 32 and the pivot shaft 36B provided at the upper end portion of the upper outer link rod 34. By being connected to the pivot shaft 36A, the link mechanism 5 is held by the hydraulic cylinder 6 at two locations, upper and lower, so that the shaking of the work table 4 and the link mechanism 5 can be reduced when the work table 4 is raised and lowered. it can.

  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 link mechanism may have three or more stages, and the number of square pipes may be increased in accordance with the number of stages of the link mechanism.

DESCRIPTION OF SYMBOLS 1 Lifting platform apparatus 2 Bogie body 3 Wheel 4 Worktable 5 Link mechanism 6 Hydraulic cylinder (lifting means)
31 Lower link inner link 杆 (lower link 杆)
32 Lower outer link 杆 (Link 杆, Lower link 杆)
33 Upper link 杆 (upper link 杆)
34 Upper outer link 杆 (Link 杆, Upper link 杆)
36 36A 36B Pivot shaft 42 First square pipe (cover member)
43 Second square pipe (cover member)

Claims (4)

A truck body with wheels for traveling;
A link mechanism provided at the top of the cart body;
A workbench provided at an upper portion of the link mechanism;
Elevating means provided in the cart body,
The lifting / lowering table apparatus, wherein the lifting / lowering means is connected to a pivot shaft provided at an upper end of a link rod constituting the link mechanism.   The link mechanism has an upper and lower two-stage configuration composed of an upper link rod and a lower link rod, and the lifting means is provided at the upper end portion of the upper link rod and the upper end of the lower link rod. The lifting platform device according to claim 1, wherein the lifting platform device is connected to a pivot shaft provided in the section.   The elevator apparatus according to claim 1 or 2, wherein the elevator means is a cylindrical hydraulic cylinder that expands and contracts in the vertical direction.   4. The lifting platform apparatus according to claim 3, wherein the lifting means includes a cover member that covers the hydraulic cylinder.

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