JP2016011014A - Jack device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jack device which prevents metal contact of a ground plate to inhibit impact and rust etc. from being caused by storage.SOLUTION: A jack device includes: an outer post 20 which opens at a lower end, extends in a vertical direction, and has a hollow box shape; an inner post 30 which is fitted in the outer post 20 so as to vertically move; and a ground plate 50 attached to a lower part of the inner post 20. The jack device is stored by moving the inner post 30 upward relative to the outer post 20 and placing an upper surface of the ground plate 50 in contact with the lower end of the outer post 20. Upper sliders 23R, 23L and lower sliders 24R, 24L for smoothly sliding the inner post 30 in the vertical direction are provided in the outer post 20. The lower slider 24R of the sliders is provided protruding downward from the lower end of the outer post 20.

Description

  The present invention relates to a jack device that is attached to a work vehicle and is used for lifting and supporting the vehicle.

  It is conventionally known that such a jack device is attached to the side of a vehicle body of a working vehicle and the jack device is extended during work to support the vehicle body. For example, Patent Document 1 below discloses an aerial work vehicle 1 as an example of a work vehicle configured by attaching jacks (jack devices) 10 to the front, rear, left and right of a vehicle body 2. A general configuration of such a conventional jack device will be described with reference to FIG. A jack apparatus 500 shown in FIG. 7 includes a hollow box-like outer post 510 attached to the side of the vehicle body and having an opening at the lower end, an inner post 520 fitted up and down with respect to the outer post 510, and an inner post 520. It is comprised from the earthing | grounding board 530 joined to the lower end of this, and the jack cylinder 540 provided in both the posts 510 and 520 so that expansion | extension up and down was possible.

  When working with a working vehicle equipped with the jack device 500, the jack cylinder 540 is extended and the inner post 520 is extended downward with respect to the outer post 510 to ground the ground plate 530. Lift and support. Thus, the vehicle is stably supported against the overturning moment generated in the vehicle, and the work can be performed safely. On the other hand, when the work is finished, the jack cylinder 540 is contracted and the inner post 520 is contracted upward, and the inner post 520 is fitted into the outer post 510 and stored. Here, the ground plate 530 is generally configured to have a larger area than the lower end opening of the outer post 510, and usually the upper surface of the ground plate 530 is in contact with the lower end of the outer post 510. The jack cylinder 540 is retracted and stored. At this time, the grounding plate 530 is pressed against the lower end of the outer post 510 by the tensile force of the jack cylinder 540 until the reduction operation is stopped.

Japanese Patent No. 4118822

  By the way, when the inner post 520 is retracted by the reduction operation of the jack cylinder 540, when the ground plate 530 comes into contact with the lower end of the outer post 510, the ground plate comes into contact at a speed corresponding to the operation speed of the jack cylinder 540. There is a problem in that there is a possibility that an impact is generated when the contact is made and an impact sound is generated or the contact part is deteriorated (such as peeling of the paint). Further, after the grounding plate 530 comes into contact with the lower end of the outer post 510, the reduction operation force of the jack cylinder 540 acts on the contact portion until the reduction operation of the jack cylinder 540 is stopped, and this operation force applies the reduction operation force. There is a problem that the contact portion is more likely to deteriorate.

The jack device 500 is usually made of steel because it requires strength (rigidity) that can withstand the load of the vehicle when the vehicle is lifted and supported. For this reason, the contact between the lower end of the outer post 510 and the ground plate 530 that occurs when the jack cylinder 540 is retracted and retracted is a metal contact, and the above-described impact noise is likely to be loud, and the contact portion is more deteriorated. There is a problem that it is likely to be severe. In particular, when using a steel material, the surface is generally painted for the purpose of preventing rust, etc., but by impact contact as described above, contact by receiving the operating force of the jack cylinder 540, There is a problem that the paint on the contact portion is peeled off, and rust is easily generated in the portion.

  The present invention has been made in view of such a problem, and reduces the impact between the outer post and the ground plate during storage, suppresses the generation of impact sound, and deteriorates the contact portion (particularly, the contact portion). An object of the present invention is to provide a jack device having a simple configuration capable of suppressing the peeling of paint and the occurrence of rust.

  In order to solve the above-described problems, a jack device according to the present invention includes a hollow box-shaped outer member (for example, the outer post 20 in the embodiment) that is open at the lower end and extends vertically, and is movable up and down within the outer member. An inner member (for example, the inner post 30 in the embodiment) fitted into the inner member, and a grounding plate attached to a lower portion of the inner member, and the inner member is moved upward with respect to the outer member. A jack device that is stored with the lower surface of the outer member being in contact with the upper surface of the ground plate, and for sliding the inner member smoothly up and down inside the outer member (For example, the upper sliders 23R, 23L, 23F, and 23B and the lower sliders 24L and 24B in the embodiment) Provided several, at least some of the plurality of the slider member (e.g., the lower slider 24R in the embodiment, 24F) are provided to protrude downward from the lower end of the outer member.

  In the jack apparatus described above, the slider member is preferably made of a material softer than the outer member and the ground plate.

  In the jack apparatus described above, it is preferable that the outer member and the ground plate are formed using a steel material, and the slider member is formed using a resin material.

  In the jack device described above, an expansion space (for example, the right expansion space 22R and the front expansion space 22F in the embodiment) that extends outward and is opened downward is formed inside the lower portion of the outer member, Some slider members are attached to the lower inner side of the outer member in the vicinity of the upper wall portion (for example, the right side wall lower surface 21R and the front side wall lower surface 21F in the embodiment) that forms the upper portion of the expansion space. The configuration is preferable.

  The jack device according to the present invention is based on the premise that the upper surface of the ground plate is in contact with the lower end of the outer member, and among the plurality of slider members for smoothly sliding the inner member up and down. At least a portion of the outer member protrudes downward from the lower end of the outer member. For this reason, when the jack device is retracted, the ground plate is received by the slider member, and the retracted state is brought into contact with the lower end of the slider member. The slider member is a member usually used in a jack device, and is generally configured using a softer material than the outer member in order to smoothly slide the inner member up and down. Since the slider member is used to receive the ground plate, the impact when the ground plate abuts can be absorbed and alleviated. Thereby, the impact sound at the time of contact | abutting of the grounding board at the time of storage can be suppressed, and degradation (peeling peeling etc.) of a contact part can be suppressed. Although a similar effect can be obtained by separately providing a soft material member for receiving the ground plate at the lower end of the outer member, a new separate member is required. On the other hand, in the case of the jack device according to the present invention, only the lower end of a part of the slider member is projected, and this slider member has a function as a slider and a function of receiving the grounding plate while reducing the impact. It also has the effect of simplifying the configuration.

  If the slider member is made of a material softer than the outer member and the ground plate, the strength of the outer member and the ground plate, and thus the strength of the jack device, can be secured while the impact of the ground plate during storage is made by the soft material slider member. Receiving and impact can be absorbed effectively.

  When the outer member and the ground plate are made of steel and the slider member is made of a resin material, the strength of the outer member and the ground plate, and thus the strength of the jack device are secured in the same manner as described above. However, the impact of the ground plate during storage can be received by the slider member made of a resin material, and the impact can be effectively absorbed.

  Furthermore, if the slider member provided to protrude downward from the lower end of the outer member is attached close to the upper wall portion that forms the upper portion of the expansion space, the ground plate is pressed when stored. The force acting on the slider member is also received by the upper wall portion. For this reason, the attachment strength of the slider member can be increased.

It is a perspective view showing an aerial work vehicle equipped with a jack device according to the present invention. It is a perspective view which shows the jack apparatus (state in which the inner post was stored in the outer post) mounted in the aerial work vehicle. It is the perspective view which shows the jack apparatus extended below, (a) is a perspective view which abbreviate | omitted illustration of the outer post and the reinforcement member, (b) abbreviate | omitted illustration of the outer post, the inner post, and the reinforcement member It is a perspective view. It is sectional drawing which shows the IV-IV part in FIG. It is sectional drawing which shows the VV part in FIG. It is sectional drawing which shows the VI-VI part in FIG. It is a perspective view which shows the conventional jack apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, an example in which the jack device according to the present invention is mounted on an aerial work vehicle as an example of a work vehicle will be described. FIG. 1 shows a perspective view of an aerial work vehicle 1 constructed by mounting a jack device 10 according to the present invention. First, with reference to FIG. explain. For convenience of explanation, the following explanation will be given by defining the arrow directions attached to each figure as front and rear, left and right, and up and down directions.

  The aerial work vehicle 1 is configured on the basis of a truck vehicle having a driving cab 2a and front and rear wheels 3a, 3b that can run freely. A turntable 4 that is driven by a turning motor (not shown) to be horizontally turnable is disposed on the vehicle body 2 of the vehicle, and a boom 5 that can be raised and lowered by a hoisting cylinder 6 is pivoted on the turntable 4. It is tied. The boom 5 is configured by nesting a front end boom 5b in a base end boom 5a that is pivotally connected to the swivel base 4, and is extendable and retractable by a built-in telescopic cylinder (not shown). A vertical post member (not shown) is attached to the tip of the tip boom 5b so as to be swingable in the vertical direction, and the work table 7 is horizontally placed on the vertical post member via a swinging device (not shown). It is attached so that it can turn (swing). In addition, a leveling device (not shown) is disposed between the tip boom 5b and the vertical post member, and the work table 7 is always held horizontally by the leveling device regardless of whether the boom 5 is raised or lowered.

An operator gets on the work table 7 and performs work at a high place. At this time, an operating device (not shown) for operating the operator to move the work table 7 is provided as a work table. 7 is provided. For this reason, an operator who has boarded the work table 7 operates the operation lever of the operation device to perform the turning operation of the turning table 4, the raising and lowering operation of the boom 5, the swinging operation of the work table 7, and the like. Thus, the work table 7 can be moved to a desired height, and work at a desired height can be performed.

  In this way, when working at a high place, it is difficult to stably support the vehicle body 2 only by the front and rear wheels 3a and 3b. Therefore, the jack devices 10 are provided at the four front, rear, left and right portions of the vehicle body 2. Specifically, an outrigger beam 8 is fitted in an outrigger box (not shown) attached to the vehicle body 2 so as to be extendable to the left and right, and a jack device 10 is attached to the left and right ends of the outrigger beam 8. . For this reason, the outrigger beam 8 can be expanded and contracted to the left and right with respect to the outrigger box, so that the jack device 10 can be extended outward in the left and right directions or stored in the left and right directions. In addition, since each jack apparatus 10 has the same basic composition, the jack apparatus 10 provided in the front left side of the vehicle body 2 is demonstrated below, referring FIGS.

  As shown in FIG. 2, the jack device 10 includes an outer post 20 that is vertically attached to the tip of the outrigger beam 8, an inner post 30 that is movably inserted into the outer post 20, and an outer post. A jack cylinder 40 that moves the inner post 30 up and down with respect to 20, a ground plate 50 that is positioned below the inner post 12 and is grounded to the road surface, and a joint mechanism 60 that attaches the ground plate 50 to the lower end of the inner post 12; It is configured with. 2 shows a state in which the upper portion of the jack device 10 is opened for easy understanding of the internal structure of the upper portion of the jack device 10.

  The outer post 20 is formed in a rectangular frame shape by bending a plate-shaped steel material at a substantially right angle to a post body member 21 formed in a box shape with a rectangular cross section opened downward using a steel material. Reinforcing members 22, 22 coupled to the lower outer surface are provided. Each reinforcing member 22 surrounds the lower opening of the post body member 21 from the side and is coupled so as to protrude downward from the post body member 21, thereby improving the strength (rigidity) of the lower portion of the post body member 21. ing.

  The inner post 30 is formed in a box shape with a rectangular cross section that is opened up and down using a steel material, and is inserted into the outer post 20 so as to be movable up and down.

  As shown in FIG. 3, the jack cylinder 40 is configured by fitting a cylinder rod 42 having a piston (not shown) at the upper end into a cylinder tube 41, and the cylinder rod is hydraulically supplied into the cylinder tube 41. 42 is constituted by a hydraulic cylinder that is extended and contracted. The jack cylinder 40 is disposed in a space surrounded by the posts 20 and 30, and an upper end portion 43 of the cylinder tube 41 is pivotally connected to an upper portion of the post body member 21 via an upper end pivot pin 43a ( (See FIG. 2). On the other hand, a rod head 44 having a pin insertion hole 44a is formed at the lower end of the cylinder rod 42, and is connected to the joint mechanism 60 via the rod head 44 (see FIG. 6, details will be described later). .

  The ground plate 50 is formed in a flat plate shape using a steel material, and has a larger area than the lower opening of the outer post 20.

  As shown in FIGS. 4 to 6, the joint mechanism 60 includes a pair of left and right inner post connecting members 61, 61 attached to the lower end of the inner post 30, and a box-shaped cylinder rod 42 having an open top. A joint member 62 attached to the rod head 44 and a pair of front and rear ground plate connecting members 63 and 63 attached to the upper surface of the ground plate 50 are configured.

As shown in FIG. 5, the inner post connecting member 61 is formed with pin insertion holes 61 a penetrating left and right, and attached to the inner left and right inner surfaces of the inner post 30 so as to extend downward from the lower end of the inner post 30. It is done.

  The joint member 62 includes an accommodation space 62a opened upward, pin insertion holes 62b and 62b penetrating left and right, and front and rear shaft portions 62c and 62c (see FIG. 6) extending front and rear from the front and rear outer surfaces. The The joint member 62 is attached to the rod head 44 by accommodating the rod head 44 in the accommodation space 62a. In the mounted state, the joint member is inserted into the pin insertion hole 61a of the inner post connecting member 61, the pin insertion hole 62b of the joint member 62, and the pin insertion hole 44a of the rod head 44 by inserting the lower end pivot pin 64 to the left and right. 62 is supported by the rod head 44 (inner post connecting member 61) so as to be swingable back and forth around the lower end pivot pin 64.

  The ground plate connecting member 63 has a shaft insertion hole 63a penetrating in the front-rear direction, and the front-rear shaft portion 62c of the joint member 62 is inserted in the front-rear direction through the shaft insertion hole 63a. For this reason, the ground plate 50 is supported by the joint member 62 through the ground plate connecting member 63 so as to be swingable left and right around the front and rear shaft portion 62c. As can be seen from the fact that the joint member 62 is swingably supported back and forth around the lower end pivot pin 64 as described above, the ground plate 50 is connected to the inner post 30 (rod) via the joint mechanism 60. The head 44) is supported so as to be swingable back and forth and from side to side.

  The jack apparatus 10 configured as described above extends the jack cylinder 40 to move the inner post 30 downward with respect to the outer post 20, and is connected to the jack cylinder 40 via the joint mechanism 60. By grounding 50, the vehicle body 2 can be lifted and supported. Here, since the ground plate 50 is supported by the rod head 44 through the joint mechanism 60 so as to be swingable back and forth and right and left, it swings back and forth and left and right so as to be in contact with the road surface and parallel to the road surface. And ground in that state. For this reason, the ground contact area with the road surface in the ground plate 50 can be ensured, and the vehicle body 2 can be lifted and supported stably.

  When the aerial work vehicle 1 is moved and moved after completion of the aerial work, the jack cylinder 40 is contracted to move the inner post 30 (ground plate 50) upward relative to the outer post 20 for storage. Let When the inner post 30 is retracted in this way, the jack cylinder 40 is reduced until the upper surface of the ground plate 50 contacts the lower end of the outer post 20, and until the reduction operation of the jack cylinder 40 is stopped, The state where the ground plate 50 is pressed against the lower end of the outer post 20 by the tensile force of the jack cylinder 40 continues. In particular, since the ground plate 50 and the outer post 20 are made of steel, if they are brought into direct contact (metal contact), a large impact or impact sound is generated or the contact portion is severely deteriorated. In addition, there is a problem that the coating for preventing rust is peeled off and rust is easily generated. Therefore, in the jack device 10 according to the present invention, this problem is solved by utilizing a slider for smoothly moving the inner post 30 up and down. Hereinafter, this slider will be described in detail.

  As shown in FIGS. 2 and 3, upper sliders 23R, 23L, 23F, and 23B are attached to the outer post 20 below the connecting portion with the outrigger beam 8, and below the upper sliders. Lower sliders 24R, 24L, 24F, and 24B are attached in the vicinity of the lower opening.

  The upper sliders 23R, 23L, 23F, and 23B are formed in a rectangular flat plate shape using a resin material (for example, MC nylon (registered trademark)), and the right side wall portion, the left side wall portion, the front side wall portion of the post body member 21, respectively. It is attached to the rear side wall and slidably contacts the right outer surface, left outer surface, front outer surface, and rear outer surface of the inner post 30.

  The lower sliders 24R, 24L, 24F, and 24B are formed in a rectangular flat plate shape using a resin material (for example, MC nylon (registered trademark)) having strength (rigidity) that can withstand the tensile force of the jack cylinder 40. Yes.

  As shown in FIG. 5, the lower slider 24 </ b> R is surrounded by a right side wall lower surface 21 </ b> R of the post body member 21 and an inner surface of the reinforcing member 22 protruding downward from the right side wall part of the post body member 21. Attached to the expansion space 22R. The right expansion space 22R is a space that expands to the right and is opened downward. The lower slider 24R is attached to the inner surface of the reinforcing member 22 so as to be close to the right side wall lower surface 21R in the vertical direction, and is in sliding contact with the right outer surface of the inner post 30 (the surface on which the upper slider 23R is in sliding contact). The lower slider 24R has a vertical dimension that protrudes downward with respect to the reinforcing member 22 in a state where the lower slider 24R is positioned and attached to the right expansion space 22R. On the other hand, the lower slider 24L is attached to the inner surface of the lower end of the left wall portion of the post body member 21 so as to face the lower slider 24R on the left and right, and the left outer surface of the inner post 30 (the upper slider 23L is in sliding contact). Slidably contact the surface.

  As shown in FIG. 6, the lower slider 24 </ b> F is surrounded by a front side wall lower surface 21 </ b> F of the post body member 21 and an inner surface of the reinforcing member 22 protruding downward from the front side wall part of the post body member 21. Attached to the expansion space 22F. The front expansion space 22F is a space that expands forward and opens downward. The lower slider 24F is attached to the inner surface of the reinforcing member 22 so as to be close to the front side wall lower surface 21F in the vertical direction, and is in sliding contact with the front outer surface of the inner post 30 (the surface on which the upper slider 23F is in sliding contact). Similarly to the lower slider 24R, the lower slider 24F has a vertical dimension that protrudes downward with respect to the reinforcing member 22 in a state where the lower slider 24F is positioned and attached to the front expansion space 22F. On the other hand, the lower slider 24B is attached to the lower inner surface of the rear side wall portion of the post body member 21 so as to face the lower slider 24F in the front-rear direction, and the rear outer surface of the inner post 30 (the upper slider 23B is slid). Slidably contact the contact surface.

  Thus, since the upper sliders 23R, 23L, 23F, and 23B and the upper sliders 24R, 24L, 24F, and 24B are in sliding contact with the outer surface of the inner post 30, the inner post 30 is smoothly moved up and down with respect to the outer post 20. be able to. When the jack device 10 is stored, the jack cylinder 40 is contracted and the ground plate 50 is received and stored by the lower end of the outer post 20, that is, the lower sliders 24R and 24F. Here, since the lower sliders 24R and 24F are formed of a resin material, even if the ground plate 50 is contacted at a speed corresponding to the operating speed of the jack cylinder 40, the impact due to the contact is reduced. Since it is absorbed and relaxed by 24F, it is possible to suppress the occurrence of impact and impact sound during storage.

  When the jack device 10 is retracted, the lower sliders 24R and 24F are pulled by the tensile force of the jack cylinder 40 until the reduction operation of the jack cylinder 40 is stopped after the grounding plate 50 is brought into contact with the lower sliders 24R and 24F. The state in which the grounding plate 50 is pressed on continues. In general, the surface of the jack device 10 is painted to prevent rust, etc., but the lower sliders 24R and 24F for receiving the ground plate 50 are formed of a resin material softer than the ground plate 50 (steel material) as described above. Therefore, even if the pressed state continues, peeling of the paint on the contact portion of the ground plate 50 can be suppressed, and the occurrence of rust on the contact portion can be suppressed.

When the jack device 10 is retracted, if the ground plate 50 is pressed from the lower side against the lower sliders 24R, 24F by the reduction operation of the jack cylinder 40, the lower surface of the post main body member 21 via the lower sliders 24R, 24F. The reduction operating force of the jack cylinder 40 acts upward (on the right side wall lower surface 21R and the front side wall lower surface 21). At this time, the direction of the force acting on the post body member 21 (upward) is a direction in which the strength (rigidity) is particularly secured by the structure of the post body member 21, so that the outer post 20 (post body member 21) is a jack. The force acting when the ground plate 50 is pressed by the reduction operating force of the cylinder 40 can be firmly received.

  By the way, in the jack apparatus 10, rainwater or the like may enter the outer post 20 from the gap above the outer post 20. However, as shown in FIGS. 5 and 6, in the retracted state, only the lower sliders 24 </ b> R and 24 </ b> F of the outer post 10 abut against the upper surface of the ground plate 50, and other portions are separated from the ground plate 50 in the vertical direction. Therefore, the water that has entered the inside can be discharged to the outside from the portions that are separated from each other up and down. For this reason, rainwater or the like does not accumulate inside the outer post 20 (the upper surface of the ground plate 50), and the occurrence of rust on the upper surface of the ground plate 50 can be suppressed from this point.

  Further, in order to smoothly move the inner post 30 up and down relative to the outer post 20, it is required that the distance between the inner surface (slider) of the outer post 20 and the outer surface of the inner post 30 be within an appropriate range. However, since each member constituting the jack apparatus 10 has a variation in dimensions that occurs in manufacturing within the range of tolerance, it is necessary to adjust each of the jack apparatuses 10 so that the interval is within a predetermined range. . Therefore, the jack device 10 employs an adjustment method in which a gap adjusting shim is sandwiched between the slider and the inner surface of the outer post 20 and the slider is attached to the inner surface of the outer post 20 in this state (hereinafter, referred to as the following). This adjustment is referred to as “shim adjustment”). Hereinafter, this shim adjustment will be described.

  First, a method for adjusting the left and right distance between the outer post 20 and the inner post 30 will be described. In the adjustment of the left-right distance, shim adjustment may be performed on the upper slider 23R or the upper slider 23L (the lower slider 24R or the lower slider 24L) opposed to the left and right. However, in the jack device 10, the ground plate 50 is used during storage. Thus, the upper slider 23L and the lower slider 24L are shim-adjusted in order to remove the lower slider 24R, to which the reduction operating force of the jack cylinder 40 acts, from the target of shim adjustment. When adjusting the shim, it is necessary to remove and reattach the target slider in order to install the shim. However, by removing the lower slider 24R from the target for shim adjustment, the lower slider 24R is removed from the reinforcing member 22 during shim adjustment. There is no need to remove or reinstall. For this reason, it becomes easy to firmly fix and hold the lower slider 24R, which is required to have a mounting strength that can withstand the reduction operation force of the jack cylinder 40, to the reinforcing member 22.

  Next, a method for adjusting the front-rear distance between the outer post 20 and the inner post 30 will be described. In adjusting the front / rear distance, shim adjustment may be performed on the upper slider 23F or the upper slider 23B (lower slider 24F or lower slider 24B) opposed to the front / rear. The upper slider 23B and the lower slider 24B are shim-adjusted in order to remove the lower slider 24F on which the reduction operation force is applied from the target of shim adjustment. For this reason, it becomes easy to firmly fix and hold the lower slider 24F, which is required to have a mounting strength that can withstand the reduction operating force of the jack cylinder 40, to the reinforcing member 22.

  Further, when adjusting the shim of the slider, a shim corresponding to the shape of the slider is usually used. For this reason, as described above, when the upper sliders 23B and 23L and the lower sliders 24B and 24L are shim-adjusted, the upper sliders 23B and 23L and the lower sliders 24B and 24L are used as common parts to adjust the shims. Since it is possible to reduce the types of shims used for the jack, it is easy to manage the parts of the jack device 10. Furthermore, if the upper sliders 23R and 23F are made common parts with the upper sliders 23B and 23L and the lower sliders 24B and 24L, the types of sliders are reduced and parts management becomes easier.

  In the above-described embodiment, the slider formed using the resin material has been described as an example. However, the material of the slider is not limited to the resin material, and the main points are the outer post 20 (steel material), the inner post. 30 (steel material) and a grounding plate 50 (steel material) that are softer than the inner post 30 and have a strength (rigidity) that can withstand the tensile force of the jack cylinder 40, such as brass or the like. It is also possible to form a slider using a gun metal.

  In the above-described embodiment, the configuration in which the lower sliders 24R, 24F protrude downward from the reinforcing member 22 among the lower sliders 24R, 24L, 24F, 24B is exemplified. All of the sliders 24R, 24L, 24F, and 24B may be configured to protrude downward from the reinforcing member 22.

  In the above-mentioned embodiment, although the example which applied the jack apparatus 10 which concerns on this invention to the aerial work vehicle 1 was demonstrated, it is the same also about other work vehicles which require the jack apparatus 10, for example, a crane vehicle etc. The jack device 10 according to the present invention is applicable.

10 Jack device 20 Outer post (outer member)
21F Front side wall lower surface (upper wall)
21R Right side wall lower surface (upper wall)
22F Front expansion space (expansion space)
22R right expansion space (expansion space)
23R, 23L, 23F, 23B Upper slider (slider member)
24R, 24L, 24F, 24B Lower slider (slider member)
30 Inner post (inner member)
50 Grounding plate

Claims (4)

A hollow box-like outer member whose lower end opens and extends vertically;
An inner member fitted in the outer member so as to be movable up and down;
A ground plate attached to the lower part of the inner member, and the inner member is moved upward with respect to the outer member so that the upper surface of the ground plate is in contact with the lower end of the outer member A jack device stored in
A plurality of slider members for smoothly sliding the inner member up and down are provided inside the outer member, and at least some of the plurality of slider members protrude downward from the lower end of the outer member. The jack apparatus characterized by being provided.   The jack device according to claim 1, wherein the slider member is made of a material softer than the outer member and the ground plate. The outer member and the ground plate are formed using a steel material,
The jack device according to claim 1, wherein the slider member is formed using a resin material. An expansion space is formed on the inner side of the lower part of the outer member.
The said at least one part slider member is attached to the lower inner side of the said outer member adjacent to the upper wall part which forms the upper part of the said expansion space, The Claim 1 characterized by the above-mentioned. Jacking equipment.

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