JP2014108881A - High place work platform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a storage space of a hydraulic cylinder drive unit for controlling supply-discharge of a hydraulic fluid to a hydraulic cylinder, while minimizing a height of a frame.SOLUTION: A high place work platform 1 comprises: a frame 10; a deck 20 lifting on the frame 10; and a scissors link mechanism 30 for lifting the deck 20. Here, a space formed between an X-shaped parts of the X-shaped link mechanism 30 in a state of most lowering the deck 20, that is, a position noninterfering with a pivotal shaft installed between the X-shaped parts of the X-shaped link mechanism 30, is formed as the storage space S (a hatching part), and the hydraulic cylinder drive unit 60 for supplying oil to the hydraulic cylinder of the scissors link mechanism 30, is installed on a reverse surface of the deck 20 so as to be stored in the storage space S.

Description

  The present invention relates to an aerial work platform used for a work at a high place performed for ceiling construction or work on a wall surface of a high place, and more specifically, a deck that moves up and down on the frame as a base. And an aerial work platform having a scissor link mechanism for raising and lowering the deck.

  Altitude work such as ceiling construction at the construction site, lighting installation work or painting work at the ceiling (including the back of the ceiling) and the wall surface has been conventionally performed with a scaffold at the construction site.

  However, when working with scaffolds in this way, it is necessary to assemble the scaffolds before the main construction such as ceiling construction, and to dismantle and remove the scaffolds after the completion of the construction. As the construction period becomes longer, the cost required to assemble and disassemble the scaffolding will be added to the construction cost.

  For this reason, instead of constructing such a scaffold, the use of an aerial work platform that can be carried into and out of the work site with relative ease makes it possible to shorten the construction period and reduce costs while ensuring work safety. Is reduced.

  As an example of such an aerial work platform, an aerial work platform 101 shown in FIG. 12 includes a deck 120 that lifts and lowers an operator and materials on a frame 110 that serves as a base, and the deck 120 that moves up and down. A scissor link mechanism 130 that is an elevating mechanism is provided (see Patent Document 1).

  In the example shown in FIG. 12, the above-described aerial work platform 101 and the vehicle platform 115 are provided by providing the frame 110 of the above-described high platform work platform 101 on a chassis 115 having wheels 138 driven by a motor. In this example, the aerial work platform 100 is configured to be capable of self-propelling, but the aerial work platform 101 is configured such that the frame 110 is directly grounded without being combined with such a chassis 115. There is a simpler structure that is used only at the aerial work platform 101.

  As described above, the aerial work platform 101 provided with the scissor link mechanism 130 as an elevating mechanism for raising and lowering the deck 120 includes a hydraulic cylinder (not shown) for expanding and contracting the scissor link mechanism 130. A hydraulic pressure generating means (not shown) constituted by a pump and a motor for supplying hydraulic oil to the hydraulic cylinder and a battery 162 for supplying electric power to the hydraulic pressure generating means are provided.

  As described above, in the configuration where the aerial work platform 101 is combined with the chassis 115 to form the aerial work platform 100, the above-described hydraulic pressure generating means and the battery 162 are accommodated in a space formed in the chassis 115. The structure to be adopted is adopted.

JP 2010-149964 A (FIG. 4)

  The conventional aerial work platform 100 described above employs a configuration in which the frame 110 of the aerial work platform 101 is mounted and fixed on the chassis 115 in order to enable self-propelling. The space in which the wheel driving motor and the like are accommodated can be used as the space for accommodating the battery 162 and the hydraulic pressure generating means.

  However, in the aerial work platform 101 that is used in a state where the frame 110 is directly grounded to the road surface or floor surface without being combined with the chassis 115, a space for accommodating the hydraulic pressure generating means and the battery 162 is a space in the chassis 115. It is necessary to ask for other than.

  Further, even in the configuration in which the chassis 115 and the aerial work platform 101 are combined to form the aerial work platform 100, if the accommodation space for the hydraulic pressure generating means can be secured in addition to the space in the chassis 115, the space in the chassis 115 can be secured. For example, it is possible to extend the travel time and work time in one charge by increasing the battery capacity.

  Here, when it is considered to secure the space for accommodating the above-described hydraulic pressure generating means in the frame 110 as an example, the height of the frame 110 needs to be increased. The floor height of the deck 120 is also increased, so that not only is it difficult for an operator to board the deck 120, but the overall height of the work platform 101 when the deck 120 is lowered is also increased. It occupies a relatively large space in the vertical direction.

  Further, since the raising / lowering operation of the deck 120 is performed by an operator who has boarded the deck 120, the control panel 180 including a switch and a lever for instructing the raising / lowering operation of the deck 120 is usually provided on the deck 120. Yes.

  Therefore, when the hydraulic pressure generating means is provided in the space in the frame 110 or the chassis 115, an electrical connection between the hydraulic pressure generating means provided in the frame 110 or the chassis 115 and the control panel 180 provided on the deck 120 is realized. Therefore, electrical wiring over a relatively long distance is required.

  Moreover, since the electrical wiring provided between the frame 110 and the chassis 115 and the deck 120 is zigzag along the arm of the scissor link mechanism 130 so that it does not get in the way when the deck 120 is raised and lowered, the wiring is longer and attached. Not only is the operation complicated, but the wiring is bent and extended each time the deck 120 is moved up and down, and there is a risk of disconnection due to fatigue associated with long-term use.

  Incidentally, if such a disconnection occurs while the deck 120 is raised, or if an electrical problem such as battery running out occurs, the operation of the hydraulic pressure generating means can be controlled even if the control panel 180 is operated. Therefore, the deck 120 cannot be lowered, so that an operator on the deck 120 cannot get down to the ground.

  In addition, since the deck 120 covers the upper part of the frame 110 and the chassis 115 in the lowered state, if a configuration in which the hydraulic pressure generating means and the battery 162 are accommodated in the frame 110 and the chassis 115 is adopted, the maintenance and inspection work is performed. When performing, it is necessary to work with the deck 120 raised, and maintenance and inspection work cannot be performed unless it is a work place that can ensure a relatively large space in the height direction.

  In order to solve such a problem, it is conceivable that devices such as hydraulic pressure generating means and a battery can be slid sideways from the frame 110 and the chassis 115, for example. As a result of the increase in points and manufacturing man-hours reflected in the product price, the price competitiveness in the market is lost.

  In the self-propelled aerial work platform 100 described in Patent Document 1, traveling is performed with the deck 120 raised, and the floor surface of the deck 120 approaches from one end side in the longitudinal direction. Since the floor surface of the deck 120 can be extended out (see FIG. 3 and FIG. 4 of Patent Document 1), if the position of the center of gravity increases, due to the inertia when stopped from the running state, In addition, since a large shaking occurs due to a weight deviation when an operator gets on the extended floor surface of the deck 120, and there is a risk of falling in some cases, only the battery 162 is placed in the space in the chassis 115. In addition, accommodating relatively heavy components such as hydraulic pressure generating means has the advantage that the center of gravity can be lowered to improve the stability during travel and work.

  However, even when the storage space for the hydraulic pressure generating means is secured in addition to the chassis 115 in the configuration where the chassis 115 and the aerial work platform 101 are combined to form the aerial work platform 100, as described above, By increasing the battery capacity for the space, it is possible to extend the running time and work time while maintaining the low center of gravity in the position.

  In particular, in the aerial work platform 101 that is used in a state where the frame 110 is directly grounded to the road surface or the floor surface without being combined with the chassis 115, the deck 120 is not self-propelled with the deck 120 raised. Since there is no need to consider the inertia when stopping from the running state, and since a simple structure is adopted in this type of high-level work platform, a structure in which the floor surface of the deck 120 is generally not used is adopted. The weight deviation due to the movement of the worker is less than that of the aerial work vehicle 100 described in Patent Document 1 in which the floor surface of the deck 120 is pushed out, and is lower than that of the aerial work vehicle 100. The demand for a center of gravity is low.

  Therefore, the present invention pays attention to the above points, and the space for accommodating the hydraulic pressure generating means for supplying the hydraulic oil to the hydraulic cylinder for expanding and contracting the scissor link mechanism provided on the work platform at a high altitude is provided outside the chassis and the frame. In addition to being applied not only to an aerial work platform that is used in combination with a chassis, but also to an aerial work platform that is used alone without being combined with a chassis, the frame height is reduced. Thus, the floor height of the deck when it is at its lowest position can be kept low, the electrical wiring that electrically connects the control panel and the hydraulic pressure generating means can be shortened, and the wiring is difficult to break even after long-term use. The hydraulic pressure generating means can be maintained and inspected at any position in the raised or lowered state, and even if there is a problem with the electrical system with the deck raised. Worker on board the deck and to provide a aerial work platform which realizes the arrangement of the hydraulic pressure generating means capable of performing the lowering operation of the deck.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This code is used to clarify the correspondence between the description of the scope of claims and the description of the mode for carrying out the invention. Needless to say, this code is limited to the interpretation of the technical scope of the present invention. Not used.

To achieve the above object, the aerial work platform 1 according to the present invention includes a frame 10, a deck 20 that moves up and down on the frame 10, and is disposed between the frame 10 and the deck 20 to raise and lower the deck 20. In an aerial work platform 1 having a scissor link mechanism 30 constituted by a pair of X-shaped link mechanisms 30a and 30b arranged opposite to each other,
A space formed between the X-shaped link mechanisms 30a and 30b of the scissor link mechanism 30 in the state where the deck 20 is lowered to the bottom, and is pivotally mounted between the X-shaped link mechanisms 30a and 30b. A hydraulic cylinder that forms a position that does not interfere with the shafts (371 to 376) as an accommodation space S (hatched portion in FIGS. 2 and 3) and that supplies and discharges hydraulic oil to and from the hydraulic cylinder 50 that expands and contracts the scissor link mechanism 30. The drive unit 60 is attached to the back surface of the deck 20 so as to be accommodated in the accommodation space S (Claim 1).

  In the aerial work platform 1 configured as described above, a storage box 70 having a size that can be accommodated in the storage space S is provided on the back surface of the deck 20, and the hydraulic cylinder drive unit 60 is stored in the storage box 70. Good (claim 2).

  In this way, the hydraulic cylinder drive unit 60 attached to the back surface of the deck 20 includes not only the hydraulic pressure generating means 61 constituted by a pump, a motor, etc., but also a battery 62 as a power source for the hydraulic pressure generating means 61. (Claim 3).

  In any of the above configurations, it is preferable that a control panel 80 for controlling the hydraulic cylinder drive unit 60 is provided on the deck 20 (Claim 4).

  In addition, it is preferable that an inspection window 21 be provided on the floor surface of the deck 20 above the mounting position of the hydraulic cylinder drive unit 60 so as to be opened and closed by, for example, a door 22 (Claim 5).

  As described above, when the inspection window 21 is provided on the floor surface of the deck 20, an electromagnetic valve that opens and closes an oil discharge passage for collecting oil discharged from the hydraulic cylinder 50 in the hydraulic cylinder drive unit 60. 63, and an operation knob 64 for enabling manual operation of the electromagnetic valve 63 is provided in the electromagnetic valve 63, and the operation knob 64 is disposed at a position where the operation knob 64 can be operated through the inspection window 21. (Claim 6).

  The storage space S preferably includes pivot shafts 40H and 41H that connect the upper ends of the uppermost X-shaped links 34a and 34b to the bottom surface of the deck 20 in a state where the deck 20 is raised to the uppermost position. It is formed in a range that falls within the interval W between them.

  With the configuration of the present invention described above, the following significant effects can be obtained according to the aerial work platform 1 of the present invention.

  A space formed between the pair of X-shaped link mechanisms 30a and 30b of the scissor link mechanism 30 in the state where the deck 20 is lowered to the bottom, and a pivoting shaft constructed between the X-shaped link mechanisms 30a and 30b. The position that does not interfere with (371 to 377) is the accommodation space S, and the hydraulic cylinder drive unit 60 that supplies and discharges hydraulic oil to and from the hydraulic cylinder 50 that expands and contracts the scissor link mechanism 30 is accommodated in the accommodation space S. By attaching to the back surface of the deck 20, the space existing as the dead space between the X-shaped link mechanisms 30a and 30b can be effectively used as the accommodating space S. As a result, the height of the frame 10 is increased. It is not necessary to secure a separate space for accommodating the hydraulic cylinder drive unit 60 such as increasing the height of the frame 10. While suppressing the height low, it was possible to secure the necessary housing space.

  As described above, as a result of the height of the frame 10 being kept low, the height platform 1 of the present invention can also keep the floor surface height of the deck 20 at the lowest lowered position so that the operator can get on and off. The space in the height direction required for transportation and storage can be reduced.

  In addition, as described above, the relatively heavy hydraulic cylinder drive unit 60 is attached to the deck 20, thereby increasing the weight of the deck 20. As a result, even if the work platform 1 is relatively small, the deck The stability increased by the weight increase of 20, and the shaking generated when the worker moved on the deck could be reduced.

  In the configuration in which the hydraulic cylinder driving unit 60 is housed in the housing box 70 provided on the back surface of the deck 20, the hydraulic cylinder driving unit 60 housed therein can be protected from wind and rain.

  As described above, when the deck 20 is provided with the hydraulic cylinder drive unit 60, when the control panel 80 including switches and levers for controlling the raising and lowering of the deck 20 is installed on the deck 20, both It is possible to shorten the electrical wiring (not shown) for electrical connection between them, and it is not necessary to wire the electrical wiring along the arm of the scissor link mechanism 30 in a zigzag manner. As a result, the electric wires were not bent and stretched. As a result, these wires could be made difficult to break.

  In the configuration in which the inspection window 21 is provided on the floor surface of the deck 20 in the upper part of the accommodation space S, the inspection window is in either the raised state or the lowered state. The hydraulic cylinder drive unit 60 can be inspected via the control unit 21.

  In particular, when the hydraulic cylinder drive unit 60 includes an electromagnetic valve 63 that opens and closes an oil discharge passage (not shown) for collecting oil discharged from the hydraulic cylinder 50, an operation knob 64 is provided on the electromagnetic valve 63. If it is provided and can be operated manually, the operation knob 64 is operated through the inspection window 21 so that the deck 20 cannot be lowered due to a trouble in the electric system while the deck 20 is raised. Even in this case, the deck 20 can be lowered by its own weight by manually operating the solenoid valve 63 to open the oil drain circuit.

  The above-described accommodation space S may be provided at any position as long as it is within the previously defined range, but as shown in FIG. 1, the arms 354 constituting the uppermost X-shaped links 34a and 34b. In the case where the hydraulic cylinder drive unit 60 is disposed within the sliding range of the upper end of the arm 354 that slides on the lower surface of the deck 20 in the longitudinal direction, the pivot shaft is installed between the upper ends of the arms 354 and 354. Since the pivot shaft and the hydraulic cylinder drive unit 60 interfere with each other, the upper ends of the arms 354 and 354 need to be pivotally mounted separately on the back surface of the deck 20.

  However, as shown in FIG. 9, the upper end of the uppermost X-shaped links 34a, 34b in the state where the storage space S is raised to the uppermost end position is connected to the bottom surface of the deck 20. In the case where the pivot shaft 41H is installed between the upper ends of the arms 354 and 354 that slide on the back surface of the deck 20 by being formed in a range that falls within the interval W between the shafts 40H and 41H, as shown in FIG. Even in this case, interference between the pivot shaft 41H and the hydraulic cylinder drive unit 60 does not occur, and the strength of the scissor link mechanism 30 can be improved by installing the pivot shaft 41H.

(A) is a side view and (B) is a rear view of an aerial work platform with the deck raised to the top. The rear view of an aerial work platform with the deck lowered to the bottom. A side view of an aerial work platform with the deck lowered down. The perspective view of the back surface of the deck of the aerial work platform where the deck is raised. The plane perspective view of the deck part of an aerial work platform. A partial side perspective view of an aerial work platform with the deck lowered to the bottom. It is explanatory drawing of the state which accommodated the hydraulic cylinder drive unit in the storage box, (A) is a side view, (B) is a rear view. Explanatory drawing of the outrigger provided in the flame | frame. Side surface explanatory drawing of the deck part which shows the example of arrangement | positioning change of a hydraulic cylinder drive unit. Side surface explanatory drawing of an aerial work platform which shows arrangement | positioning change of a hydraulic cylinder drive unit. The perspective view of the back surface of the deck in arrangement | positioning of the hydraulic cylinder drive unit of FIG. The rear view of the conventional aerial work platform (aerial work platform).

  Hereinafter, an aerial work platform 1 according to the present invention will be described with reference to the accompanying drawings.

  Reference numeral 1 in FIG. 1 indicates an aerial work platform, and the elevated work platform 1 is moved up and down on a frame 10 formed in a substantially rectangular frame shape in plan view via a lifting mechanism composed of a scissor link mechanism 30. A deck 20 is provided.

  The above-described frame 10 on which the scissor link mechanism 30 and the deck 20 are mounted has two channel members 11 and 11 each having a U-shaped cross section and are arranged so that the open surfaces face each other. 11 are connected by horizontal members 12 and 12 to form a substantially rectangular frame shape in plan view, and the lower end portion of the scissor link mechanism 30 is attached to the frame 10.

  In the example shown in FIGS. 1 and 2, the frame 10 is configured such that the horizontal members 12, 12 are connected to the legs by connecting the channel members 11, 11 with the horizontal members 12, 12 described above on the bottom side of the frame 10. As shown in FIGS. 1 and 2, for example, as shown in FIG. 3, leg portions 13 projecting downward from the four corners of the frame are separately provided. The aerial work platform 1 may be used with the part 13 grounded.

  Also, as shown in FIGS. 1B and 8, the horizontal members 12, 12 are formed in a telescopic structure so that the horizontal members 12, 12 are framed when the work platform 1 is used. By being configured so that it can be extended by being pulled out in the width direction of 10, the function as the outriggers 14, 14 is given to the portions drawn out from the horizontal members 12, 12. When providing, this may be provided separately from the horizontal members 12 and 12 described above.

  In the following description, the aerial work platform 1 of the present invention will be described as being used with the frame 10 having the above-described configuration grounded, but as in the prior art described with reference to FIG. Also in the aerial work platform 1 of the present invention, the above-described frame 10 may be mounted and fixed on a chassis to be used as a part of a self-propelled aerial work platform.

  The above-mentioned scissor link mechanism 30 attached to the frame 10 has its lower end pivoted by a pivot shaft 40L near one end in the front-rear direction of the frame 10 (left side in FIG. 1A). The lower end of the arm 351 and a slider (not shown) fitted to the channel material 11 of the frame 10 are pivotally attached by a pivoting shaft 41L, and can slide in the longitudinal direction of the frame 10 (channel material 11). At least one set of X-shaped links (31a, 31b) constructed by pivoting an arm 361 attached to the arm 361 by a pivot shaft 371 at a longitudinal intermediate point, and in this embodiment, As shown in FIG. 1 (B), X-shaped links formed by pivotally connecting the midpoints of the two arms are similarly pivotally connected in four steps in the height direction. Of the X-shaped link mechanism 30a composed of a group of X-shaped links (31a, 32a, 33a, 34a) appearing on the left side of the paper and the X-shaped links (31b, 32b, 33b, 34b) on the right side of the paper. The scissor link mechanism 30 is formed by a pair of X-shaped link mechanisms 30b constituted by groups.

  The scissor link mechanism 30 is provided with a hydraulic cylinder 50 so as to be able to expand and contract in the vertical direction. The piston of the hydraulic cylinder 50 moves forward and backward by supply and discharge of hydraulic oil, thereby causing a scissor link. The deck 20 attached to the upper end of the mechanism 30 can be moved up and down.

  The upper end of one of the arms 354, 364 of the pair of X-shaped links 34a, 34b provided at the uppermost stage of the scissor link mechanism 30 configured as described above is the bottom of the deck 20. The other arms 364, 364 are pivotally attached to the bottom of the deck 20 near one end in the same direction as one end of the frame 10 by a pivot shaft 40H. doing.

  In the example shown in FIG. 1, the pivot shaft 41H is provided separately at the upper end of the arm 354 of the X-shaped link 34a and the upper end of the arm 354 of the X-shaped link 34b, respectively. As shown, unlike the structure in which a single pivot shaft 41H is installed between the upper ends of the arms 354 and 354, the upper ends of the arms 354 and 354 are separated.

  In the aerial work platform 1 configured as described above, the scissor link mechanism 30 is expanded and contracted in the vertical direction by supplying and discharging oil to the hydraulic cylinder 50, and the ascending position shown in FIGS. The deck 20 can be moved up and down between the lowered positions shown in FIGS.

  In order to raise and lower the deck 20 by controlling the supply and discharge oil to the hydraulic cylinder 50 as described above, a hydraulic cylinder drive unit 60 is provided on the high work platform 1.

  The hydraulic cylinder drive unit 60 includes at least a hydraulic pressure generating means 61 including a pump for supplying hydraulic oil to the hydraulic cylinder 50 and a motor for driving the pump. As the generating means 61, in addition to the above-described pump and motor, there are provided an oil tank for storing hydraulic oil, and an electromagnetic valve 63 for opening / closing and switching the supply / discharge oil circuit provided between the oil tank and the hydraulic cylinder 50. ing.

  When used in combination with a chassis equipped with a traveling battery, the traveling battery can also be used as a power source for the hydraulic pressure generating means 61, and the battery for the hydraulic pressure generating means 61 is uniquely used. However, in order to supply electric power to the motor and the electromagnetic valve 63, which are constituent elements of the hydraulic pressure generating means 61, when the aerial work platform 1 is used alone without being combined with the chassis. The battery 62 may be included in the components of the hydraulic cylinder drive unit 60 and attached to the back surface of the deck 20.

  As described above, the hydraulic pressure generating means 61, or the hydraulic cylinder drive unit 60 constituted by the hydraulic pressure generating means 61 and the battery 62, is a pair of Xs constituting the scissor link mechanism 30 in the state where the deck 20 is moved down. The space between the character-shaped link mechanisms 30a and 30b, and the position (hatching portion in FIGS. 2 and 3) that does not interfere with the pivot shafts 371 to 377 installed between the scissor link mechanisms is defined as an accommodation space S. It is attached to the back surface of the deck 20 so as to be accommodated in the accommodation space S.

  The middle point of the two arms constituting the pair of the lowermost X-shaped links 31a and 31b, the pair of the second-stage X-shaped links 32a and 32b, and the pair of the uppermost X-shaped links 34a and 34b In the configuration of the scissor link mechanism 30 of this embodiment in which pivoting shafts 371, 373, and 377 are pivoted between the left and right X-shaped links, the accommodation space S is as shown in FIG. , The space is formed as two divided spaces (a first accommodation space S1 and a second accommodation space S2) in the longitudinal direction of the deck 20 around a pivot axis that pivots an intermediate point of each arm.

  In the embodiment shown in FIGS. 1 to 5, the hydraulic cylinder drive unit 60 is attached to the back surface of the deck 20 so as to be accommodated in the first accommodation space S1 on the right side of the paper in FIG. On the contrary, the hydraulic cylinder drive unit 60 may be attached to the back surface of the deck 20 so as to be accommodated in the second accommodation space S2 provided on the left side in FIG. 3 (see FIGS. 9 to 11).

  As described above, when the hydraulic cylinder drive unit 60 is disposed in the second storage space S2, the X-shaped links 34a and 34b at the uppermost stage when the deck 20 is at the most elevated position are preferably provided as shown in FIG. A range within the interval W formed between the two pivot shafts 40H and 41H connecting the upper ends of the arms 354 and 364 to the bottom surface of the deck 20 is defined as the second accommodation space S2.

  That is, the formation range of the first accommodation space S1 in the accommodation space shown in FIG. 3 is slidable on the back surface of the deck 20 among the arms 354 and 364 constituting the uppermost X-shaped links 34a and 34b. Since it is within the sliding range of the upper ends of the attached arms 354 and 354, when the hydraulic cylinder drive unit 60 is provided in the first accommodating space S1, a common pivot shaft 41H is provided between the upper ends of the arms 354 and 354. Since the pivot shaft 41H and the hydraulic cylinder drive unit 60 interfere with each other, the arms 354 and 354 need to be attached to the back surface of the deck 20 by the pivot shaft 41H. The strength of is reduced.

  However, as described above, when the second accommodation space S2 is limited to the interval W formed between the two pivot shafts 40H and 41H in the state where the deck 20 is at the highest position, FIG. As shown, even when a common pivot shaft 41H is installed between the upper ends of the arms 354 and 354 constituting the uppermost X-shaped links 34a and 34b, the pivot shaft 41H and the hydraulic cylinder drive unit Therefore, no interference occurs between the scissor link mechanism 30 and the scissor link mechanism 30.

  In the above example, the battery 62 is included in the components of the hydraulic cylinder drive unit 60, and the battery 62 is also attached to the back surface of the deck 20. However, the battery 62 is shown in FIG. It is good also as what is mounted on the flame | frame 10.

  As described above, even when the battery 62 is disposed on the frame 10, it is preferable that the battery 62 be disposed in the accommodation space S described above when the deck 20 is in the lowered state.

  In the illustrated example, the hydraulic pressure generating means 61 is disposed in the second accommodating space S2 and the battery 62 is accommodated in the first accommodating space S1, but conversely, the hydraulic pressure generating means 61 is disposed in the first accommodating space. The battery 62 may be arranged in the space S1 so as to be accommodated in the second accommodation space S2, or both the hydraulic pressure generating means 61 and the battery 62 are either one of the first and second accommodation spaces S1, S2. It is good also as what arrange | positions so that it may fit in.

  The hydraulic cylinder drive unit 60 can be attached to the back surface of the deck 20 by a method such as bolting directly through a bracket or the like (not shown) attached to the back surface of the deck 20 in advance. The outer periphery of the hydraulic cylinder drive unit 60 attached in this way may be covered with a storage box 70 to protect it from wind and rain. Further, the hydraulic cylinder drive unit 60 is installed in the storage box 70 attached to the back surface of the deck 20. It is good also as what attaches to the back surface of a deck by accommodating 60.

  As the configuration of the storage box 70 described above, for example, a flange protruding outward is formed at the upper end opening edge of the box body that opens upward, and the flange of the box body is formed in the opening formed on the floor surface of the deck 20. It may be attached by being inserted so as to be locked to the opening edge, or may be directly attached to the back surface of the deck 20 by welding or other methods, and its configuration is not particularly limited.

  Even if the hydraulic cylinder drive unit 60 is attached to the back surface of the deck 20 by any of the above-described methods, the inspection window 21 is provided on the floor surface of the deck 20 located above the hydraulic cylinder drive unit 60. It is preferable that maintenance inspection of the hydraulic cylinder drive unit 60 can be performed through the inspection window 21 (see FIGS. 5 and 6).

  Further, in order to prevent an accident such as an operator from tripping over the opening edge of the inspection window 21, it is preferable to provide the inspection window 21 with a door 22 that can close the window.

  Thus, by providing the inspection window 21 on the floor surface of the deck 20, whether the deck 20 is in the raised position or the lowered position, the door 22 is opened for inspection. Maintenance and inspection of the hydraulic cylinder drive unit 60 can be performed through the window 21.

  In particular, when the deck 20 is raised, the operation knob 64 for manually operating the electromagnetic valve 63 provided in the hydraulic cylinder drive unit 60 is disposed at a position where the operation can be performed through the inspection window 21. Even if the deck 20 cannot be lowered by operating the control panel 80 due to electrical system trouble such as disconnection or battery exhaustion, the operation knob 64 is manually operated so that the hydraulic cylinder 50 and the oil tank are separated from each other. By opening the communicating hydraulic oil collecting circuit, the hydraulic oil in the hydraulic cylinder 50 can be gradually discharged according to the weight of the deck 20 and the operator on the deck 20, and the deck 20 can be lowered.

  5 and 6, reference numeral 75 denotes a hanging metal fitting. When the door 22 described above is opened and the inspection window 21 is opened, the hanging metal fitting 75 is erected upward via the inspection window 21. For example, when the high work platform 1 of the present invention is loaded on a truck bed or the like, it can be lifted by a crane.

  As described above, in order to control the operation of the hydraulic cylinder drive unit 60 attached to the back surface of the deck 20 so as to be within the accommodation space S, the deck 20 has a deck 20 as shown in FIG. A control panel 80 provided with switches, levers, and the like necessary for operation is provided so that an operator who has boarded can perform the operation.

  Therefore, the operator operates the control panel 80 to control the supply / discharge oil to the hydraulic cylinder 50 by turning on / off the pump motor provided in the hydraulic cylinder drive unit 60 and operating the electromagnetic valve 63. Thus, the raising / lowering operation of the deck 20 can be performed.

  Thus, by providing the control panel 80 for operating the hydraulic cylinder driving unit 60 on the deck 20, the wiring of the circuit for electrically connecting the control panel 80 and the hydraulic cylinder driving unit 60 is connected to the deck 20. The wiring distance is shortened and the wiring distance is shortened, and it is necessary to arrange the wiring in a zigzag manner along the arm of the scissor link mechanism 30 as in the case where the hydraulic cylinder driving unit 60 is arranged on the frame 10. There is no.

  As a result, the control wiring is not bent and extended by raising and lowering the deck 20, and disconnection due to fatigue is less likely to occur, so that the reliability of the aerial work platform 1 can be improved.

  The height platform 1 of the present invention configured as described above corresponds to the height of the wall or ceiling where the work is performed from the state where the deck 20 is lowered to the lowermost position as shown in FIGS. The deck 20 is raised to a desired height and used.

  As in the embodiment shown in FIGS. 1, 2, and 8, in the configuration in which the frame 10 is provided with the outrigger 14 for preventing overturning, the operator pulls out the outrigger 14 as necessary before boarding the deck. deep.

  When an operator boarding the deck 20 inputs an instruction to raise the deck 20 by operating a switch or lever provided on the control panel 80, a motor provided in the hydraulic cylinder driving unit 60 drives the pump. Then, oil supply to the hydraulic cylinder 50 is started, the hydraulic cylinder 50 extends and the deck 20 starts to rise, and when the supply of hydraulic oil is stopped by the operation of the control panel 80 by the operator, the deck 20 is moved to a desired state. Can be stopped at height.

  As described above, in the aerial work platform 1 having the structure in which the outrigger 14 is provided on the frame 10, a sensor (not shown) for detecting the amount of overhang of the outrigger 14 is provided. The deck 20 can be raised to the uppermost position when it is in the position, but when any or all of the outriggers 14 are not in the extended position, the rising height of the deck 20 is suppressed to ½ of the maximum. , The maximum rising height of the deck 20 may be limited according to the overhanging state of the outrigger 14.

  Further, the frame 10 may be provided with an inclination sensor or the like so as to limit the rising height of the deck 20 when the frame 10 is grounded with a predetermined inclination or more.

  When the work in the state where the deck 20 is raised is completed as described above, and the operator gets down from the high work platform, the operator operates the control panel 80 again to lower the deck 20.

  The deck 20 is lowered by opening a recovery passage for collecting the hydraulic oil in the hydraulic cylinder 50 in an oil tank provided in the hydraulic cylinder driving means 60, and the operator lowers the deck via the control panel 80. , The solenoid valve 63 provided in the hydraulic cylinder drive unit 60 is actuated to open the oil drain passage, whereby the hydraulic oil in the hydraulic cylinder 50 is collected in the oil tank and the deck is lowered. To do.

  Accordingly, the hydraulic cylinder drive unit 60 is provided on the back surface of the deck 20 and an operation knob 64 for manually operating the electromagnetic valve 63 to a position where it can be operated through the inspection window 21 provided on the floor surface of the deck 20. Even if the deck 20 cannot be lowered by the operation of the control panel 80 due to an electrical problem such as disconnection or battery exhaustion when the deck 20 is raised, the operation knob is provided. The deck can be lowered by manually operating 64.

DESCRIPTION OF SYMBOLS 1 Work place 10 Height frame 11 Channel material 12 Horizontal member 13 Leg part 14 Outrigger 20 Deck 21 Inspection window 22 Door 30 Scissor link mechanism 30a, 30b X-shaped link mechanism 31a-34a, 31b-34b X-shape Links 351 to 353, 361 to 363 Arms 371 to 377 Pivoting shaft 40L Pivoting shaft (lower end fixed side)
40H Pivoting shaft (upper end fixed side)
41L Pivoting shaft (lower end sliding side)
41H Pivoting shaft (Upper end sliding side)
DESCRIPTION OF SYMBOLS 50 Hydraulic cylinder 60 Hydraulic cylinder drive unit 61 Oil pressure generating means 62 Battery 63 Solenoid valve 64 Operation knob 70 Storage box 75 Hanging bracket 80 Control panel 100 Aerial work platform 101 Aerial work platform 110 Frame 115 Chassis 120 Deck 130 Scissor link mechanism 138 Wheel 162 Battery 180 Control panel

Claims (7)

A scissor link mechanism comprising a frame, a deck that moves up and down on the frame, and a pair of X-shaped link mechanisms that are disposed between the frame and the deck to move the deck up and down. At the work platform,
A space formed between the X-shaped link mechanisms of the scissor link mechanism in the state where the deck is lowered to the position where it does not interfere with a pivot shaft built between the X-shaped link mechanisms. And a hydraulic cylinder drive unit that supplies and discharges hydraulic oil to and from the hydraulic cylinder that expands and contracts the scissor link mechanism is attached to the back surface of the deck so as to be accommodated in the accommodating space. Workbench.   2. An aerial work platform according to claim 1, wherein a storage box having a size that can be accommodated in the storage space is provided on the rear surface of the deck, and the hydraulic cylinder drive unit is stored in the storage box.   3. An aerial work platform according to claim 1, wherein the hydraulic cylinder drive unit includes a battery for power supply.   The aerial work platform according to any one of claims 1 to 3, wherein a control panel for controlling the hydraulic cylinder drive unit is provided on the deck.   5. An aerial work platform according to any one of claims 1 to 4, wherein an inspection window is provided on the floor surface of the deck above the mounting position of the hydraulic cylinder drive unit.   The hydraulic cylinder drive unit includes an electromagnetic valve that opens and closes an oil drain passage for collecting oil discharged from the hydraulic cylinder, and the solenoid valve is provided with an operation knob that enables manual operation of the solenoid valve. The aerial work platform according to claim 5, wherein the operation knob is disposed at a position where the operation knob can be operated through the inspection window.   The accommodation space is formed in a range that fits within an interval between pivot shafts that connect the upper end of the uppermost X-shaped link with the deck raised to the uppermost position to the bottom surface of the deck. The aerial work platform according to any one of claims 1 to 6.

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