JP2013129491A - Slide support device and installation method for slide support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a slide pad and a holder from floating from an inner surface of an outer boom member and removing from regular installation positions.SOLUTION: A slide support device 12 includes: a holder 16 disposed on a lower inner surface of the outer boom member 4 and allowing a plurality of slide pads 14 to be held in attitudes in which sliding surfaces 14a thereof are in slide-contact with a lower outer surface of an inner boom member 5; a back side regulating part 18 provided in the lower inner surface of the outer boom member 4 and abutting, from the back side, a back end of the holder 16 so as to prevent movement of the holder 16 to the back end side of the outer boom member 4; a front side regulating part 20 attached to a front end of the outer boom member 4 and abutting, from the front side, a front end of the holder 16 so as to prevent movement of the holder 16 to the front end side of the outer boom member 4; and a back end floating prevention part 22a for preventing the holder 16 from floating from the lower inner surface of the outer boom member 4 by holding a back end held part 26f of the holder 16 between it and the lower inner surface of the outer boom member 4.

Description

  The present invention relates to a slide support device used for a telescopic boom of a construction machine and a method for installing the slide support device.

  DESCRIPTION OF RELATED ART Conventionally, the expansion-contraction boom provided so that it could be raised and lowered in construction machines, such as a crane, was comprised so that it could expand-contract in an axial direction is known. Specifically, the telescopic boom includes a plurality of cylindrical boom members having different diameters, and a small-diameter inner boom member is inserted inside a large-diameter outer boom member. The inner boom member can move relative to the outer boom member in the axial direction, and the telescopic boom can be expanded and contracted by the relative movement of the inner boom member. Moreover, in the telescopic boom, generally, a slide support device that supports the inner boom material so as to be slidable in the axial direction is installed on the inner surface of the lower portion of the outer boom material. Patent Document 1 below discloses an example of such a slide support device.

  The slide support device disclosed in Patent Document 1 includes a plurality of slide pads, a holder, a holder protection member, a back stopper, and a front lid. The plurality of slide pads each have a sliding contact surface that is in sliding contact with the outer surface of the lower portion of the inner boom member, and supports the inner boom member so that the inner boom member can smoothly move in the axial direction. The holder holds the slide pad and is fixed on the lower inner surface of the outer boom member. Specifically, the holder is configured so that each slide pad has a sliding contact surface in sliding contact with the outer surface of the inner boom member, and the front end side of the outer boom member is arranged at a plurality of positions arranged at intervals in the circumferential direction of the inner boom member. Hold it so that it can be inserted and removed. The holder protection member prevents the holder from being damaged by preventing the holder from contacting the backstop, and is fastened to the rear end portion of the holder so as to cover the rear end surface of the holder. The back stopper is provided on the inner surface of the outer boom member, and comes into contact with the holder protection member fastened to the holder from the rear side to prevent the holder from moving to the rear end side of the outer boom member. The front lid is attached to the front end portion of the outer boom member so as to contact the front end of the holder, and restrains the holder so that the holder does not jump out from the outer boom member to the front end side. That is, in this slider device, the holder is restrained from the front and rear by the front lid and the back stopper. With this configuration, even when the inner boom member moves in the axial direction while being in sliding contact with the slide pad, the slide pad and the holder even if the slide pad receives a force in the moving direction of the inner boom member from the inner boom member. Can be prevented from being displaced in the front-rear direction (the axial direction of the outer boom).

JP 2010-168216 A

  However, in the slide support device described in Patent Document 1, the slide pad and the holder are lifted from the inner surface of the outer boom member, and over the back stopper or the front lid from their normal installation positions, the front end side of the outer boom member or There is a risk of separation to the rear end side. The reason is as follows.

  Generally, grease for reducing friction is applied to the sliding surface of the slide pad, and the slide pad may adhere to the outer surface of the inner boom material due to the adhesive force of the grease. In the structure described in Patent Document 1, since the holder is only restrained from the front and back by the front lid and the back stopper, the inner boom member is the outer boom member with the slide pad attached to the outer surface of the inner boom member. If it is displaced in a direction away from the inner surface, the slide pad and the holder for holding it may be lifted from the inner surface of the outer boom member together with the inner boom member. When the slide pad and the holder are attached to the inner boom material and lifted from the inner surface of the outer boom material, the slide pad and the holder are properly moved when the inner boom material moves in the direction of advancement from the front end of the outer boom material. There is a risk of getting over the front lid from the installation position and detaching to the front end side of the outer boom material. If the inner boom material moves to the rear end side of the outer boom material, the slide pad and holder will get over the back stopper from the normal installation position. There is a risk of disengagement to the rear end side of the outer boom material.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent the slide pad and the holder from floating from the inner surface of the outer boom member and detaching from the normal installation position.

  In order to achieve the above object, a slide support device according to the present invention includes an outer boom member formed in a cylindrical shape, and an inner boom member inserted into the outer boom member, and the inner member with respect to the outer boom member. Provided in a telescopic boom of a construction machine that expands and contracts by relative movement of the boom material in the axial direction, and the inner boom material is slidable in the axial direction while being fixed to the inner surface of the lower portion of the outer boom material. A slide support device for supporting the inner boom material, wherein the plurality of slide pads each have a sliding contact surface slidably contacting an outer surface of the lower portion of the inner boom material; and an inner surface of the lower portion of the outer boom material; A holder for holding the plurality of slide pads at a plurality of positions aligned in the circumferential direction of the outer boom member in a posture in which the sliding contact surfaces are in sliding contact with the outer surface of the inner boom member; A rear regulating portion that is provided on an inner surface of a lower portion of the side boom member and abuts against the rear end portion of the holder from the rear side so as to prevent the holder from moving to the rear end side of the outer boom material; A front regulating portion attached to the front end portion of the outer boom material and contacting the front end portion of the holder from the front side so as to prevent the holder from moving to the front end side of the outer boom material; and a specific part of the holder Is interposed between the lower inner surface of the outer boom member and the holder prevents the holder from floating from the lower inner surface of the outer boom member.

  In this slide support device, the levitation prevention unit is held by the holder in order to prevent the holder from floating from the inner surface of the lower part of the outer boom member by sandwiching a specific part of the holder with the inner surface of the lower part of the outer boom member. Even if the slide pad adheres to the outer surface of the inner boom member, the slide pad and the holder are prevented from floating with the displacement of the inner boom member in the direction away from the inner surface of the outer boom member. For this reason, even if the slide pad adheres to the outer surface of the inner boom material, the slide pad and the holder get over the front side regulation part from the normal installation position when the inner boom material moves in the direction of advancement from the front end of the outer boom material. Detaching to the front end side of the outer boom material, and when the inner boom material moves to the rear end side of the outer boom material, the slide pad and holder are moved from the proper installation position to the rear restricting portion. It is possible to prevent getting over to the rear end side of the outer boom material. Therefore, in this slide support device, it is possible to prevent the slide pad and the holder from floating from the inner surface of the outer boom member and detaching from the regular installation position.

  In the slide support device, the holder has a rear end sandwiched portion sandwiched between the floating prevention portion and a lower inner surface of the outer boom member at a rear end portion, and the floating prevention portion The rear portion of the holder is provided on the inner side of the outer boom member so that the relative position with respect to the inner surface of the lower portion of the boom member is fixed, and the rear end portion of the holder is prevented from floating from the inner surface of the lower portion of the outer boom member. It is preferable to include a rear end levitation preventing portion that sandwiches the end sandwiched portion with the inner surface of the lower portion of the outer boom member.

  According to this configuration, it is possible to effectively prevent the detachment to the rear end side, which is likely to occur among the detachment of the outer boom material from the normal installation position of the slide pad and the holder to the front end side and the rear end side. Specifically, since the rear side restricting portion is provided on the inner surface of the outer boom material, the outer side restricting portion is arranged to avoid interference with the inner boom material when the inner boom material is inserted into the outer boom material. The amount of protrusion from the inner surface of the boom material to the inner side must be reduced. For this reason, the holder easily gets over from the regular installation position to the rear end side of the outer boom material over the rear side restricting portion. On the other hand, in the present configuration, since the rising prevention portion prevents the rear end portion of the holder from being lifted, it is possible to effectively prevent the rear end portion of the holder from getting over the rear side restriction portion. Detachment of the holder from the normal installation position to the rear end side of the outer boom material can be effectively prevented.

  In this case, the rear end levitation preventing portion has an opening at the front end side of the outer boom material between the lower inner surface of the outer boom material and the rear end sandwiched portion of the holder through the opening. It is preferable that a gap inserted from the front end side of the boom material toward the rear end side is formed, and the front side regulation portion is attached to the front end portion of the outer boom material so as to be detachable.

  The slide support device installation method according to the present invention is a method of installing the slide support device having this configuration on the telescopic boom, wherein the rear regulating portion is installed on the inner surface of the lower portion of the outer boom member. A rear-side levitation unit is installed, and the rear-end levitation prevention unit is attached to the outer boom member so that the gap is formed between the rear-end levitation prevention unit and the inner surface of the lower portion of the outer boom member. A blocking portion attaching step, a pad holding step for holding the slide pad on the holder, and the holder holding the slide pad from the front end side of the outer boom member in a state in which the front side regulating portion is removed from the outside. The holder is inserted into a space between the inner surface of the lower part of the boom member and the outer surface of the lower part of the inner boom member, and the rear end part of the holder is brought into contact with the rear side restricting part and the holder An insertion step of inserting the rear end sandwiched portion into the gap between the rear end floating prevention portion and the inner surface of the lower portion of the outer boom member; and after the insertion step, the front regulating portion is a front end of the holder And a front side restricting part attaching step for attaching the front side restricting part to the front end part of the outside boom material so as to come into contact with the part from the front end side of the outside boom material.

  According to these structures, the operation | work which fixes a slide pad and a holder on the inner surface of the lower part of an outer boom material in the state in which the inner boom material was inserted in the outer boom material can be facilitated. Specifically, in these configurations, in a state where the front side regulating portion is removed from the front end portion of the outer boom material, the inner surface of the lower portion of the outer boom material and the outer surface of the lower portion of the inner boom material from the front end side of the outer boom material. A slide pad and a holder can be inserted in the space between the two. And in these structures, since the said clearance gap formed between the rear-end floating prevention part and the inner surface of the lower part of an outer boom material is opening the front end side of an outer boom material, the holder inserted in the said space is used. The rear end clamping part can be inserted into the gap through the front opening from the front end side of the outer boom material, and then the slide pad and the holder are fixed by attaching the front side restriction part to the front end part of the outer boom material. can do. That is, in these configurations, the fixing operation of the slide pad and the holder can be performed from the front end side of the outer boom material, and the fixing operation is performed in a narrow space between the inner surface of the outer boom material and the outer surface of the inner boom material. It does not have to be. For this reason, the fixing operation of the slide pad and the holder can be facilitated.

  In the configuration in which the levitation prevention unit includes the rear end levitation prevention unit, the holder is provided so as to be positioned on both sides of the rear end sandwiched portion in the circumferential direction of the outer boom member. It is preferable that the rear end levitation preventing portion has a circumferential movement restricting portion that abuts from both sides in the circumferential direction of the outer boom material so as to prevent the outer boom material from moving in the circumferential direction.

  According to this configuration, the rear end sandwiched portion of the holder is sandwiched between the rear end floating prevention portion and the inner surface of the lower portion of the outer boom member, so that the rear end portion of the holder is prevented from being lifted, and the circumferential direction When the movement restricting portion comes into contact with the rear end floating prevention portion from both sides, it is possible to prevent the rear end portion of the holder from being displaced in the circumferential direction of the outer boom member. That is, according to this configuration, it is possible to prevent the positional deviation of the holder in the circumferential direction without separately providing a fixing member for preventing the positional deviation of the outer boom material in the circumferential direction. For this reason, the position shift of the holder in the circumferential direction of the outer boom material can be prevented while preventing an increase in the number of members.

  In the configuration in which the levitation prevention part includes the rear end levitation prevention part, the slide support device is provided in the front side regulation part, and the front side regulation part is attached to the front end part of the outer boom member. A holder front end levitation prevention unit that protrudes from the front end surface of the holder into the rear end side of the outer boom member from the front end surface of the holder and prevents the front end portion of the holder from floating from the inner surface of the lower portion of the outer boom member. It is preferable to provide.

  According to this configuration, it is possible to effectively prevent lifting of the front end of the holder in addition to lifting of the rear end of the holder from the inner surface of the lower part of the outer boom material. Can be prevented from leaving the installation position. In this configuration, the holder front end levitation preventing portion prevents the front end portion of the holder from being lifted, so that the front end portion of the holder can be effectively prevented from getting over the front side regulating portion. It is possible to more effectively prevent detachment from the normal installation position to the front end side of the outer boom material.

  In this case, a portion that contacts the front end portion of the holder from the front side in a state of being attached to the front end portion of the outer boom member in the front side restricting portion penetrates the portion in the axial direction of the outer boom member. A holder fixing screw hole is formed, and the holder front end floating prevention portion is fixed to the holder so that a front end portion projects from the holder fixing screw hole to a rear end side of the outer boom material and enters the front end portion of the holder. A holder fixing screw that is screwed into the screw hole from the front side is preferable.

  According to this configuration, the front end portion of the holder can be lifted simply by screwing the holder fixing screw from the front side into the holder fixing screw hole of the front side restricting portion with the front side restricting portion attached to the front end portion of the outer boom member. Can be prevented. For this reason, in order to prevent the front end portion of the holder from being lifted up, the front side restricting portion is once removed from the front end portion of the outer boom material, and then the front end portion of the holder is fixed to the inner surface of the outer boom material with some fixture. Compared to the configuration, it is possible to simplify the fixing operation of the front end portion of the holder required to prevent the front end portion of the holder from being lifted.

  In the configuration in which the levitation prevention part includes the rear end levitation prevention part, the slide support device is provided in the front side regulation part, and the front side regulation part is attached to the front end part of the outer boom member. Projecting from the front end surface of the slide pad into the front end portion of the slide pad and preventing the front end portion of the slide pad and the front end portion of the holder from floating from the inner surface of the outer boom material. It is preferable to provide a pad front end floating prevention portion.

  According to this configuration, it is possible to effectively prevent the front end portion of the slide pad and the front end portion of the holder from being lifted in addition to the lift of the rear end portion of the holder from the inner surface of the lower portion of the outer boom material. It is possible to prevent the slide pad and the holder from being detached from the regular installation position. In this configuration, the pad front end floating prevention portion prevents the front end portion of the slide pad and the front end portion of the holder from being lifted, so that it is particularly effective that the front end portion of the slide pad and the front end portion of the holder get over the front side regulation portion. Therefore, it is possible to more effectively prevent the slide pad and the holder from separating from the normal installation position toward the front end side of the outer boom member.

  In this case, the front-side restricting portion has a portion that protrudes toward the outer surface side of the inner boom material from the front end portion of the holder and faces the front end surface of the slide pad in a state of being attached to the front end portion of the outer boom material. A pad fixing screw hole penetrating the part in the axial direction of the outer boom member is formed at the part, and the pad front end levitation preventing part has a tip part extending from the pad fixing screw hole to the outer side. It is preferable that the pad fixing screw is screwed into the pad fixing screw hole from the front side so as to protrude toward the rear end side of the boom material and bite into the front end portion of the slide pad from the front end surface of the slide pad.

  According to this configuration, the front end portion of the slide pad and the front end portion of the slide pad can be simply inserted into the pad fixing screw hole of the front side restricting portion while the front side restricting portion is attached to the front end portion of the outer boom member. Lifting of the front end of the holder can be prevented. For this reason, in order to prevent the front end portion of the slide pad and the front end portion of the holder from being lifted up, the front side restricting portion is once removed from the front end portion of the outer boom member, and then the front end portion of the slide pad and / or the front end of the holder is fixed with some fixture. Compared with a configuration in which the portions are fixed to the inner surface of the outer boom member, the fixing work required to prevent the front end portions from being lifted can be simplified. Furthermore, in this configuration, since the pad fixing screw bites into the front end surface of the slide pad and prevents the front end portion of the slide pad from floating, the front end portion of the slide pad held by the holder can be prevented from floating from the holder. Can do. For this reason, it can prevent more reliably that the slide pad hold | maintained at the holder detaches | leaves from the holder.

  In the slide support device, the holder is arranged on the inner surface of the lower portion of the outer boom member so as to be aligned in the circumferential direction of the outer boom member, and each of the holders has a plurality of slide pads in the circumferential direction of the outer boom member. A plurality of split holders that are held in a line, and a connecting member that is configured to be detachable from the split holder and that connects adjacent ones of the plurality of split holders in a state of being attached to the split holder. It is preferable to become.

  According to this configuration, it is possible to effectively prevent detachment of the holder and the slide pad from the regular installation position while reducing labor required for installing the holder and the slide pad on the inner surface of the lower portion of the outer boom member. it can. Specifically, in this configuration, since the holder includes a plurality of divided holders, and the connecting members that can be attached to and detached from the divided holders are connected to the divided holders, the adjacent divided holders are connected to each other. If the member is removed from the split holder, the split holders can be separated from each other. If the holder cannot be divided in this way and is integrally formed, the total weight of the holder and all the slide pads held by the holder becomes very large. It takes a lot of labor to install on the inner surface of the boom material. On the other hand, in this configuration, the holder can be divided into a plurality of divided holders and installed on the inner surface of the outer boom member. Therefore, labor required for installing the holder and the slide pad on the inner surface of the outer boom member. Can be reduced. And after installing each division | segmentation holder on the inner surface of an outer side boom material, if what adjoins those division | segmentation holders is connected with a connection member, a some division | segmentation holder can be integrated and a holder can be formed. The holder integrated in this way is more stable than each of the divided holders that are individually separated. For this reason, the detachment | leave from the regular installation position of a holder and a slide pad can be prevented effectively.

  In this case, each of the split holders has an insertion groove formed on the surface facing the other split holder adjacent in the circumferential direction of the outer boom member so as to extend from the front end to the rear side, and the connecting member Is configured to be detachable from the front end side of the outer boom member into the insertion groove of one of the divided holders and the insertion groove of the other divided holder, respectively. It is preferable to connect the divided holders adjacent to each other while being inserted into the insertion groove.

  According to this structure, after installing each division | segmentation holder in the space between the inner surface of the lower part of an outer side boom material, and the outer surface of the lower part of an inner side boom material, a connection member is set to each insertion groove corresponding to a mutually adjacent division | segmentation holder. The adjacent divided holders can be connected by inserting from the front end side of the outer boom member. That is, in this configuration, since the adjacent holders can be connected to each other from the front end side of the outer boom material, the adjacent divided holders in the space between the inner surface of the outer boom material and the outer surface of the inner boom material. Compared to a configuration in which it is necessary to perform the connecting operation, the connecting operation can be facilitated.

  As described above, according to the present invention, it is possible to prevent the slide pad and the holder from being lifted from the inner surface of the outer boom member and detached from the normal installation position.

It is a schematic side view of the crane provided with the telescopic boom in which the slide support apparatus by 1st Embodiment of this invention is used. It is a disassembled perspective view of the principal part of the slide support apparatus by 1st Embodiment of this invention, and the telescopic boom by which it is installed. It is the figure which looked at the outer side boom material in which the rear side control part and rear end levitation prevention part which comprise the said slide support apparatus were provided toward the rear end side from the front end side. It is sectional drawing along the IV-IV line in FIG. 3 of the front end part vicinity of an outer side boom material. It is a perspective view of the holder which comprises the slide support apparatus by 1st Embodiment of this invention. It is sectional drawing of the front end part vicinity of the said holder in the direction orthogonal to the axial direction of an outer side boom material. It is a top view of the bottom part holder which comprises the said holder. It is sectional drawing to which the connection part of the bottom part holder and side part holder which comprise the said holder was expanded. It is a figure which shows partially the longitudinal cross section along the axial direction of the telescopic boom in which the slide support apparatus by 1st Embodiment of this invention was installed. It is a figure which shows partially the longitudinal cross section along the axial direction of the telescopic boom in which the slide support apparatus by 2nd Embodiment of this invention was installed. It is a figure which shows partially the longitudinal cross section along the axial direction of the telescopic boom in which the slide support apparatus by the 1st modification of 2nd Embodiment of this invention was installed. It is a figure which shows partially the longitudinal cross section along the axial direction of the telescopic boom in which the slide support apparatus by the 2nd modification of 2nd Embodiment of this invention was installed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, with reference to FIGS. 1-9, the structure of the slide support apparatus by 1st Embodiment of this invention is demonstrated.

  The slide support device according to the first embodiment is used for a telescopic boom of a construction machine. Specifically, for example, the slide support device 12 (see FIG. 2) according to the first embodiment is provided on the telescopic boom 2 that is provided so as to be able to move up and down on a crane as shown in FIG. The telescopic boom 2 hangs a suspended load from its tip via a wire rope and a hook device (not shown). The telescopic boom 2 includes a plurality of boom members 3. Each boom member 3 is formed in a cylindrical shape having different diameters, and the telescopic telescopic boom 2 is configured by inserting the small-diameter boom member 3 inside the large-diameter boom member 3. Yes.

  Each boom member 3 has a top wall, a pair of side walls extending downward from both ends of the top wall, and a bottom wall connecting the lower ends of these side walls. The upper part of the top wall and each side wall is formed in a flat plate shape, and the part from the lower part of both side walls to the bottom wall, that is, the lower part of the boom member 3 has a cross-sectional shape curved so as to protrude downward. . In the present embodiment, strictly speaking, the lower portion of each boom member 3 is formed into a polygonal shape by bending a flat plate at a plurality of locations, and has a macroscopically curved shape. Moreover, the cross sections orthogonal to the axial direction of each boom 3 are similar to each other. Among the plurality of boom members 3, a boom member 3 having a large diameter and receiving a small-diameter boom member 3 is an outer boom member 4, and the boom member 3 inserted into the outer boom member 4 is an inner portion. Boom material 5. Therefore, the boom material 3 arranged on the most proximal side (the crane main body side) of the telescopic boom 2 is the outer boom material 4, and the boom material 3 located on the most distal side of the telescopic boom 2 is the inner boom material. 5, but the other boom members 3 are the outer boom members 4 and the inner boom members 5 at the same time. The telescopic boom 2 expands and contracts by relative movement in the axial direction of the inner boom member 5 with respect to the outer boom member 4. In the following description, “front side” and “front end side” mean the front end side of the telescopic boom 2 or boom member 3 (the side far from the main body of the crane), and “rear side” and “rear end” "Side" means the base end side of the telescopic boom 2 or boom member 3 (the side close to the main body of the crane).

  In the slide support device 12 according to the first embodiment, the inner boom member 5 slides in the axial direction while being fixed to the inner surface of the lower portion of the outer boom member 4 (the portion located on the lower side in the cross section orthogonal to the axial direction). The inner boom member 5 is supported so that it becomes possible. Alternatively, the slide support devices 12 may be installed on all the outer boom members 4 included in the telescopic boom 2, and the corresponding inner boom members 5 may be supported by the respective slide support devices 12.

  As shown in FIG. 2, the slide support device 12 according to the first embodiment includes a plurality of slide pads 14, a holder 16, a rear side restriction part 18, a front side restriction part 20, and a levitation prevention part 22. Yes.

  The plurality of slide pads 14 are in sliding contact with the outer surface of the lower portion of the inner boom member 5 so that the inner boom member 5 can slide in the axial direction. Each slide pad 14 has a sliding contact surface 14 a that is in sliding contact with the outer surface of the lower portion of the inner boom member 5. Specifically, the slide pad 14 is formed in a flat and substantially rectangular parallelepiped shape, and the upper surface thereof constitutes the sliding contact surface 14a. The slide pad 14 is preferably made of a material having a certain degree of strength and a low coefficient of friction against the outer surface of the inner boom member 5. For example, various resins having such properties are used as the material of the slide pad 14. Further, grease is applied to the sliding contact surface 14 a of the slide pad 14 in order to reduce friction with the outer surface of the inner boom member 5.

  The holder 16 holds the plurality of slide pads 14 at a plurality of positions aligned in the circumferential direction of the outer boom member 4 in a posture in which the sliding contact surfaces 14 a are in sliding contact with the outer surface of the lower portion of the inner boom member 5. The holder 16 is disposed on the inner surface of the lower portion of the outer boom member 4 and has a curved shape along the curved inner surface of the lower portion of the outer boom member 4. The holder 16 holds the slide pads 14 so that the plurality of slide pads 14 are arranged along the curved shape of the lower part of the outer boom member 4 and the lower part of the inner boom member 5.

  Specifically, the holder 16 includes a plurality (three in the present embodiment) of divided holders 26 and a plurality (two in the present embodiment) of connecting members 28 (see FIGS. 5 and 6). ).

  The plurality of divided holders 26 are arranged on the inner surface of the lower portion of the outer boom member 4 so as to be arranged in the circumferential direction of the outer boom member 4. Each split holder 26 holds a plurality (predetermined number) of slide pads 14 so that they are aligned in the circumferential direction of the outer boom member 4. In the present embodiment, one bottom holder 26 a and two side holders 26 b are provided as the split holder 26.

  The bottom holder 26 a is installed on the inner surface of the bottom wall of the outer boom member 4. The bottom holder 26a connects a plurality of (six in this embodiment) pad holding portions 26c each holding the slide pad 14 one by one and adjacent ones of the plurality of pad holding portions 26c. And a plurality of (in the present embodiment, five) inter-holding-portion connecting portions 26d (see FIG. 7). The plurality of pad holding portions 26c and the plurality of holding portion connecting portions 26d are integrally formed.

  Each pad holding portion 26 c is arranged so that the bottom holder 26 a is arranged on the inner surface of the bottom wall of the outer boom member 4 in the circumferential direction of the outer boom member 4. Each pad holding portion 26c has a flat and substantially rectangular parallelepiped shape. Each pad holding portion 26 c has a fitting recess 26 e for holding one slide pad 14. The fitting recess 26e is a bottomed recess recessed from the surface of the pad holding portion 26c (the surface facing the outer surface of the inner boom member 5) to the back side. When the slide pad 14 is fitted into the fitting recess 26e, the slide pad 14 is held by the pad holding portion 26c. The fitting recess 26e is formed so that the slide pad 14 can be attached to and detached from the fitting recess 26e, but the inner surface of the outer boom member 4 is attached to the slide pad 14 fitted in the fitting recess 26e. The slide pad 14 is fitted with a fitting force that prevents the slide pad 14 from coming out of the fitting recess 26e even if a slight force is applied in the direction away from the fitting recess 26e. Specifically, in a state where the bottom holder 26 a is fixed to the inner surface of the outer boom member 4, the slide pad 14 attached to the outer surface of the inner boom member 5 by the adhesive force of grease separates from the inner surface of the outer boom member 4. The slide pad 14 is fitted into the fitting recess 26e with a fitting force that can prevent the slide pad 14 from coming out of the fitting recess 26e even when pulled by the inner boom member 5 that is displaced in this manner.

  In addition, as shown in FIG. 9, the fitting recess 26e is inserted into the fitting recess 26e so that the back surface (lower surface) of the slide pad 14 is in contact with the bottom surface in the fitting recess 26e. In this state, it has such a depth that a portion on the sliding contact surface 14a (front surface) side of the slide pad 14 protrudes from the surface of the pad holding portion 26c. That is, the depth of the fitting recess 26 e is smaller than the thickness of the slide pad 14. The protruding amount of the slide pad 14 may be adjusted by interposing, for example, a thin plate spacer between the back surface (lower surface) of the slide pad 14 and the bottom surface in the fitting recess 26e. Thereby, it is possible to adjust the contact condition of each slide pad 14 with respect to the outer surface of the inner boom member 5 and to adjust the position of the inner boom member 5 supported by the slide pad 14.

  As shown in FIG. 6, each inter-holding-portion connecting portion 26d has a width smaller than that of the pad holding portion 26c and a thickness smaller than that of the pad holding portion 26c. Specifically, on the front surface (surface facing the outer surface of the inner boom member 5) side and the rear surface (surface facing the inner surface of the outer boom member 4) side of the bottom holder 26a, the positions (adjacent to each other) of the connecting portions 26d between the holding portions. Grooves from the front end to the rear end of the bottom holder 26a are formed at positions between the matching pad holding portions 26c. Each of these grooves extends linearly in the front-rear direction (the axial direction of the boom member). With such a configuration, the bottom holder 26a can be bent at each holding portion connecting portion 26d, and the bottom portion 26a is adjusted by adjusting the angle formed by the pad holding portions 26c connected to each holding portion connecting portion 26d. The shape of the bottom holder 26 a can be adjusted according to the shape of the inner surface of the bottom wall of the outer boom member 4 so that the holder 26 a fits the inner surface of the bottom wall of the outer boom member 4.

  Further, the bottom holder 26a includes a rear end sandwiched portion 26f and a rear end sandwiched portion 26f sandwiched between a later-described rear end suspension preventing portion 22a of the suspension preventing portion 22 and an inner surface of the lower portion of the outer boom member 4. It has the circumferential direction movement control part 26g which contact | abuts from the both sides of the circumferential direction of the outer side boom material 4 with respect to the rear end levitation | floating prevention part 22a pinched | interposed between the inner surfaces of the lower part of the outer side boom material 4 (FIG. 7). reference).

  The rear end sandwiched portion 26f is disposed at the rear end portion of the bottom holder 26a, and is spaced at two locations at the rear end portion in the circumferential direction of the outer boom material 4 (the direction in which the plurality of pad holding portions 26c are arranged). Is provided. Specifically, in the present embodiment, the rear end sandwiched portion 26f includes the rear end portion of the pad holding portion 26c located second from the one end side of the bottom holder 26a in the circumferential direction of the outer boom member 4, and the circumferential direction thereof. And the rear end portion of the pad holding portion 26c located second from the other end side of the bottom holder 26a. The rear end sandwiched portion 26f has a smaller thickness than a portion located around the rear end sandwiched portion 26f.

  The circumferential movement restricting portion 26g is located from both sides in the circumferential direction of the outer boom member 4 with respect to the rear end floating prevention portion 22a so as to prevent the rear end portion of the bottom holder 26a from moving in the circumferential direction of the outer boom member 4. Abut. Specifically, the circumferential direction movement restricting portions 26g are provided on both sides of each rear end sandwiched portion 26f in the circumferential direction of the outer boom member 4, and the inner boom member 5 is located more than the rear end sandwiched portion 26f. Projects to the outer surface. That is, the rear end sandwiched portion 26f and the circumferential movement restricting portions 26g provided on both sides thereof form a recess into which the rear end floating preventing portion 22a is fitted at the rear end portion of the bottom holder 26a.

  The bottom holder 26a has two insertion grooves 26h into which the connecting member 28 is inserted. The insertion grooves 26 h are respectively provided at one end and the other end of the bottom holder 26 a in the circumferential direction of the outer boom member 4. Specifically, the insertion groove 26h is formed on one end surface facing the one side holder 26b and the other end surface facing the other side holder 26b in the circumferential direction of the outer boom member 4 in the bottom holder 26a. Yes. The insertion grooves 26h formed on the respective end faces of the bottom holder 26a are formed so as to extend linearly from the front end of the bottom holder 26a to the rear side, and the rear end portion is a predetermined position before the rear end of the bottom holder 26a. Is arranged. Each insertion groove 26h is open on both end surfaces and the front end surface of the bottom holder 26a in the circumferential direction of the outer boom member 4.

  The two side holders 26b are separately arranged on both sides of the bottom holder 26a in the circumferential direction of the outer boom member 4, and are formed so as to be symmetrical with each other (see FIG. 6). Each side holder 26b has a plurality (four in this embodiment) of pad holding portions 26j and a plurality (three in this embodiment) of inter-holding portion connecting portions 26k. Each pad holding portion 26j of the side holder 26b is configured in the same manner as the pad holding portion 26c of the bottom holder 26a, and each inter-holding portion connecting portion 26k of the side holder 26b is connected to the bottom holder 26a. It is comprised similarly to the connection part 26d between holding | maintenance parts. That is, each pad holding portion 26c of the side holder 26b is arranged so as to be aligned in the circumferential direction of the outer boom member 4, and has a fitting recess 26m configured similarly to the fitting recess 26e. In addition, each side holder 26b adjusts an angle formed by the pad holding portions 26j to which the respective holding portion connecting portions 26k are connected, and is a portion of the lower portion of the outer boom member 4 where the side holder 26b is installed. The shape of the side holder 26b can be adjusted according to the shape of the inner surface of the portion so as to fit the inner surface.

  Each side holder 26b has one rear end sandwiched portion 26p and circumferential movement restricting portions 26q disposed on both sides of the rear end sandwiched portion 26p (see FIG. 5). The rear end sandwiched portion 26p and the circumferential movement restricting portions 26q on both sides thereof are located behind the pad holding portion 26j located on the side farthest from the bottom holder 26a among the plurality of pad holding portions 26j constituting each side holder 26b. It is provided at the end. Other configurations of the rear end sandwiched portion 26p and the circumferential direction movement restricting portion 26q of the side holder 26b are the same as the configurations of the rear end sandwiched portion 26f and the circumferential direction movement restricting portion 26g of the bottom holder 26a. . Each side holder 26b has one insertion groove 26r into which the connecting member 28 is inserted. The insertion groove 26r is formed on an end surface of the side holder 26b facing the end of the bottom holder 26a in the circumferential direction of the outer boom member 4. The other configuration of the insertion groove 26r is the same as the configuration of the insertion groove 26h of the bottom holder 26a.

  Each connecting member 28 connects the bottom holder 26a and the side holder 26b adjacent to each other, and is attached to the holders 26a and 26b so as to be detachable. Specifically, as shown in FIG. 6, one of the two connecting members 28 includes one end of the bottom holder 26 a in the circumferential direction of the outer boom member 4 and one side holder 26 b adjacent to the one end. The other of the two connecting members 28 is connected to the other end of the bottom holder 26a in the circumferential direction of the outer boom member 4 and the end of the other side holder 26b adjacent to the other end. And Each connecting member 28 is made of, for example, a thin metal plate, and has a portion inserted into the insertion groove 26h of the bottom holder 26a and a portion inserted into the insertion groove 26r of the side holder 26b facing the insertion groove 26h ( (See FIG. 8). That is, the connecting member 28 is inserted across the insertion groove 26h of the bottom holder 26a and the insertion groove 26r of the side holder 26b facing each other, thereby connecting the bottom holder 26a and the side holder 26b. By connecting the bottom holder 26a and the side holder 26b by the connecting member 28, the bottom holder 26a and the two side holders 26b are integrated to form a curved shape as shown in FIG.

  The plurality of rear side restricting portions 18 come into contact with the rear end portion of the holder 16 from the rear side so as to prevent the holder 16 from moving to the rear end side of the outer boom member 4 (see FIG. 9). . Each rear side restricting portion 18 is made of, for example, a metal plate, and is arranged along the inner surface of the lower portion of the outer boom member 4 in the circumferential direction thereof, and is fixed to the inner surface of the lower portion of the outer boom member 4 by welding or the like. (See FIG. 3). The rear side restricting portion 18 is installed at a position away from the front end of the outer boom member 4 by a certain distance from the rear end side. Specifically, in the rear side restricting portion 18, the position of the front end of the holder 16 installed on the inner surface of the lower portion of the outer boom member 4 so as to contact the rear side restricting portion 18 is the front end of the outer boom member 4. It is provided at a position that matches the position.

  The front regulating part 20 comes into contact with the front end part of the holder 16 from the front side so as to prevent the holder 16 from moving to the front end side of the outer boom member 4 (see FIG. 9). Specifically, the front side restricting portion 20 is detachably attached to the collar 4a of the front end portion of the outer boom member 4, and has a shape that restrains the holder 16 from the front end side of the outer boom member 4 in the attached state. Specifically, the front-side restricting portion 20 is arranged so as to be aligned along the lower front edge (collar 4a) of the outer boom member 4, and can be individually attached to and detached from the collar 4a of the front end portion of the outer boom member 4. It consists of a plurality of front side division restricting portions 20a to be attached (see FIG. 2). The plurality of front division restricting portions 20a are formed in a substantially U shape extending as a whole along the front edge of the outer boom member 4 in a state of being attached to the collar 4a of the front end portion of the outer boom member 4 as a whole. The holder 16 has a circumferential length that can include the entire arrangement region of the holder 16. The front side restricting portion 20 has a portion that protrudes to the inner side (the outer surface side of the inner boom member 5) than the inner surface of the lower portion of the outer boom member 4 in a state of being attached to the collar 4a at the lower front end portion of the outer boom member 4. The protruding portion is in contact with the front end surface of the holder 16. Further, in this state, the inner end of the portion protruding inward of the front regulating portion 20 is located at a position inside the lower surface of the inner boom member 5 (the lower surface of the inner boom member 5) than the surface of the holder 16 (the surface facing the outer surface of the lower portion of the inner boom member 5). Of the slide pad 14 held by the holder 16 and a position outside the sliding contact surface 14a (position near the inner surface of the lower portion of the outer boom member 4). Each front division restricting portion 20 a is fastened by a bolt 21 to a collar 4 a at the front end portion of the lower portion of the outer boom member 4.

  The levitation prevention unit 22 (see FIG. 9) sandwiches a specific portion of the holder 16 between the lower inner surface of the outer boom member 4 and prevents the holder 16 from floating from the lower inner surface of the outer boom member 4. Is for. In other words, the levitation prevention unit 22 specifies the holder 16 so that a force directed from the inner surface of the lower portion of the outer boom member 4 toward the outer surface of the lower portion of the inner boom member 5 acts on the holder 16 to counter the force. This prevents the holder 16 from being displaced in the direction from the inner surface of the lower part of the outer boom member 4 toward the outer surface of the lower part of the inner boom member 5.

  In the first embodiment, the levitation preventing portion 22 moves the rear end sandwiched portions 26f and 26p of the holder 16 to the outside so as to prevent the rear end portion of the holder 16 from floating from the inner surface of the lower portion of the outer boom member 4. It consists of a plurality (four in this embodiment) of rear end floating prevention parts 22a sandwiched between the lower inner surface of the boom member 4. Each rear end floating prevention portion 22a is made of a metal plate formed in a chip shape, and the outer boom is formed such that one surface (back surface) forms a certain gap with the inner surface of the lower portion of the outer boom member 4. It is provided inside the material 4. In other words, each rear end levitation preventing portion 22a is provided inside the outer boom member 4 so that the relative position (interval) with respect to the inner surface of the lower portion of the outer boom member 4 is fixed. And the clearance gap which each rear end floating prevention part 22a forms between the inner surface of the lower part of the outer side boom material 4 is a clearance gap where the rear end clamping parts 26f and 26p of the holder 16 are inserted. Each rear end levitation preventing portion 22a is fixed to the upper surface of the rear regulating portion 18 (the surface facing the outer surface of the lower portion of the inner boom member 5) by welding. Moreover, each rear end levitation prevention part 22a is arrange | positioned at intervals in the circumferential direction of the outer side boom material 4 (refer FIG.3 and FIG.4). The distance between the rear end levitation preventing portions 22 a is equal to the distance between the rear end sandwiched portions 26 f and 26 p provided on the holder 16. Further, the rear end levitation preventing portion 22a has a shape that is fitted so as to fit in the recess formed by the rear end sandwiched portions 26f and 26p of the holder 16 and the circumferential movement restricting portions 26g and 26q on both sides thereof. . Further, the gap formed between the rear end floating prevention portion 22a and the inner surface of the lower portion of the outer boom member 4 opens to the front end side of the outer boom member 4, and the rear end sandwiched portion 26f of the holder 16 through the opening. 26p can be inserted from the front end side of the outer boom member 4 toward the rear end side. Each rear end levitation preventive portion 22a is configured to prevent the rear end levitation from being restrained when a force is applied to the holder 16 from the inner surface of the lower portion of the outer boom member 4 toward the outer surface of the lower portion of the inner boom member 5. The rear end portion of the holder 16 comes into contact with the rear end sandwiched portion 26f or 26p inserted into the gap between the portion 22a and the lower inner surface of the outer boom member 4 from the inner side. Displacement in the direction toward the outer surface of the lower portion of the inner boom member 5 is prevented.

  In the present embodiment, the rear end of the holder 16 abuts on the front end of the rear side restricting portion 18 on the lower inner surface of the outer boom member 4, and the position of the front end of the holder 16 in the front-rear direction is the front end of the outer boom member 4. The position corresponding to the position, and the corresponding rear end levitation preventing portion 22a is fitted in each recess formed by the rear end sandwiched portions 26f and 26p of the holder 16 and the circumferential movement restricting portions 26g and 26q on both sides thereof. Is the regular installation position of the holder 16 and the slide pad 14 installed on the inner surface of the lower part of the outer boom member 4.

  Next, an installation method for installing the slide support device 12 according to the first embodiment on the telescopic boom 2 will be described.

  First, in this installation method, before assembling the boom members 3 of the telescopic boom 2 to each other, the rear regulating portion 18 and the rear end floating prevention portion 22a are previously installed on the outer boom member 4. Specifically, each rear regulating portion 18 is attached to the inner surface of the lower portion of the outer boom member 4 at the above-described position by welding, and thereafter, the four rear end levitation preventing portions 22a are disposed at the above-described positions. To be attached by welding.

  Thereafter, the inner boom member 5 is inserted into the outer boom member 4, and in this state, constituent members other than the rear side restricting portion 18 and the rear end levitation preventing portion 22 a are installed on the outer boom member 4.

  Specifically, a predetermined number of slide pads 14 are respectively inserted into the divided holders 26 by fitting the slide pads 14 into the fitting recesses 26e and 26m of the divided holders 26 (the bottom holder 26a and the side holders 26b). Hold.

  Thereafter, the bottom holder 26a holding the slide pad 14 is moved from the front end side of the outer boom member 4 in a state where the front restricting portion 20 is removed to the lower inner surface of the outer boom member 4 and the lower portion of the inner boom member 5. Insert it into the space between the outer surface of At this time, the slide pad 14 and the bottom holder 26a are inserted to a position where the rear end of the bottom holder 26a comes into contact with the rear regulating portion 18, and the rear end clamping portion 26f of the bottom holder 26a is inserted into the corresponding rear end floating prevention portion. It inserts into the clearance gap between 22a and the inner surface of the lower part of the outer boom material 4 toward the rear end side from the front end side of the outer boom material 4. FIG. As a result, the rear end sandwiched portion 26f of the bottom holder 26a is sandwiched between the corresponding rear end floating prevention portion 22a and the inner surface of the lower portion of the outer boom member 4, and the rear end portion of the bottom holder 26a is the outer boom member. 4 is temporarily fixed so as not to move in the circumferential direction.

  Thereafter, the one side holder 26 b holding the slide pad 14 is placed in a space between the front end side of the outer boom member 4 and the lower inner surface of the outer boom member 4 and the lower outer surface of the inner boom member 5. And it inserts in the space located in the one side of the bottom part holder 26a in the circumferential direction of the outer side boom material 4. FIG. At this time, in the same manner as when the bottom holder 26a is inserted, the side holder 26b is inserted to a position where the rear end of the side holder 26b comes into contact with the rear regulating portion 18, and the rear end cover of the side holder 26b is inserted. The sandwiching portions 26p are inserted into the gaps between the corresponding rear end floating prevention portions 22a and the lower inner surface of the outer boom member 4. As a result, the rear end sandwiched portion 26p of one side holder 26b is sandwiched between the corresponding rear end floating prevention portion 22a and the inner surface of the lower portion of the outer boom member 4, and the rear end of the side holder 26b. The part is temporarily fixed so as not to move in the circumferential direction of the outer boom member 4. Thereafter, the other side holder 26b holding the slide pad 14 is similarly a space between the lower inner surface of the outer boom member 4 and the lower outer surface of the inner boom member 5 and the outer boom member 4. It inserts in the space located in the other side of the bottom holder 26a in the circumferential direction. As a result, the rear end sandwiched portion 26p of the other side holder 26b is sandwiched between the corresponding rear end floating prevention portion 22a and the inner surface of the lower portion of the outer boom member 4, and the side holder 26b The rear end portion is temporarily fixed so as not to move in the circumferential direction of the outer boom member 4.

  Next, the connecting member 28 is connected to the insertion groove 26h provided at one end in the circumferential direction of the bottom holder 26a and the insertion groove 26r of the one side holder 26b facing the insertion groove 26h. An insertion groove 26h provided at the other end in the circumferential direction of the bottom holder 26a and an insertion groove 26r of the other side holder 26b facing the insertion groove 26h while being inserted from the front end side toward the rear side The other connecting member 28 is inserted from the front end side of the outer boom member 4 toward the rear side. Thereby, in the space between the lower inner surface of the outer boom member 4 and the lower outer surface of the inner boom member 5, the bottom holder 26a and the two side holders 26b are connected via the connecting member 28, and the holder 16 Is formed.

  Next, the front side restricting portion 20 is fastened to the collar 4 a at the lower front end portion of the outer boom member 4 with bolts 21. At this time, the front division | segmentation control part 20a is fastened one by one. Specifically, each front-side division restricting portion 20 a is fastened to the collar 4 a of the outer boom material 4 so that each front-side division restricting portion 20 a comes into contact with the front end of the holder 16 from the front end side of the outer boom material 4. By attaching the front restricting portion 20 to the collar 4 a of the outer boom member 4, the holder 16 is restrained from the front and rear by the front restricting portion 20 and the rear restricting portion 18.

  As described above, the slide support device 12 according to the first embodiment is installed on the telescopic boom 2.

  In the first embodiment, the rear end floating preventing portion 22a sandwiches the rear end sandwiched portions 26f and 26p of the holder 16 with the inner surface of the lower portion of the outer boom member 4, and the rear end portion of the holder 16 is the outer boom member. 4, even if the slide pad 14 held by the holder 16 adheres to the outer surface of the inner boom member 5 by grease or the like, the slide pad 14 and the holder 16 are not attached to the outer boom member. The floating of the inner boom member 5 in the direction away from the inner surface of the inner member 4 is prevented from floating. For this reason, even if the slide pad 14 adheres to the outer surface of the inner boom member 5, when the inner boom member 5 moves in the direction of advancement from the front end of the outer boom member 4, the slide pad 14 and the holder 16 are properly installed. Can be prevented from getting over the front regulating part 20 from the front side and detaching to the front end side of the outer boom member 4, and when the inner boom member 5 moves to the rear end side of the outer boom member 4, the slide pad 14 and the holder It is possible to prevent 16 from getting over the rear side restricting portion 18 from the regular installation position and detaching to the rear end side of the outer boom member 4. Therefore, in this 1st Embodiment, it can prevent that the slide pad 14 and the holder 16 lift from the inner surface of the outer side boom material 4, and detach | leave from a regular installation position.

  Further, in the first embodiment, the rear end levitation preventing portion 22a prevents the rear end portion of the holder 16 from being lifted, and therefore the front end side and the rear side of the outer boom member 4 from the normal installation positions of the slide pad 14 and the holder 16. Of the separation toward the end side, the separation toward the rear end side, which is likely to occur, can be particularly effectively prevented. Specifically, since the rear regulating portion 18 is provided on the inner surface of the lower portion of the outer boom member 4, the inner boom member 5 is inserted into the outer boom member 4 when the telescopic boom 2 is assembled. In order to avoid interference between the material 5 and the rear side restricting portion 18, the amount of protrusion of the rear side restricting portion 18 from the inner surface of the outer boom material 4 to the inside must be reduced. For this reason, the holder 16 easily gets over the rear side restricting portion 18 from the regular installation position and is detached to the rear end side of the outer boom member 4. On the other hand, in the first embodiment, the rear end levitation preventing portion 22a prevents the rear end portion of the holder 16 from being lifted, so that it is effective for the rear end portion of the holder 16 to get over the rear side restricting portion 18. It is possible to prevent the slide pad 14 and the holder 16 from being properly set to the rear end side of the outer boom member 4 and to effectively prevent them from coming off.

  Moreover, in the said 1st Embodiment, the operation | work which fixes the slide pad 14 and the holder 16 on the inner surface of the lower part of the outer boom material 4 in the state in which the inner boom material 5 was inserted in the outer boom material 4 is made easy. Can do. Specifically, in the first embodiment, since the front side restricting portion 20 can be attached to and detached from the front end portion of the outer boom member 4, the front restricting portion 20 is removed from the front end portion of the outer boom member 4. The slide pad 14 and the holder 16 can be inserted into the space between the lower inner surface of the outer boom member 4 and the outer surface of the lower portion of the inner boom member 5 from the front end side of the outer boom member 4. And since the front end side of the outer side boom material 4 is opening the clearance gap formed between each rear end levitation | blocking prevention part 22a and the inner surface of the lower part of the outer side boom material 4, the rear of the holder 16 inserted in the said space is carried out. The end clamping portions 26f and 26p can be inserted into the gap from the front end side of the outer boom member 4 through the opening on the front side, and then the front side restriction portion 20 is in contact with the front end of the holder 16. By attaching 20 to the front end portion of the outer boom member 4, the slide pad 14 and the holder 16 can be fixed. That is, in the first embodiment, the fixing operation of the slide pad 14 and the holder 16 can be performed from the outside of the front end of the outer boom member 4, and between the inner surface of the outer boom member 4 and the outer surface of the inner boom member 5. It is not necessary to perform the fixing work in a narrow space. For this reason, the fixing work of the slide pad 14 and the holder 16 can be facilitated.

  Moreover, in the said 1st Embodiment, each division | segmentation holder 26 of the holder 16 prevents the movement of the outer end boom material 4 of the rear end part of the holder 16 in the circumferential direction from the outer end boom material 22a. 4 has circumferential movement restricting portions 26g and 26q that come into contact with both sides in the circumferential direction, the rear end lifting prevention portion 22a prevents the rear end portion of the holder 16 from being lifted, and the outer boom member 4 moves in the circumferential direction. The rear end portion of the holder 16 can be prevented from being displaced. That is, in the said 1st Embodiment, the positional displacement of the holder 16 to the circumferential direction is prevented, without providing the fixing member for preventing the positional displacement of the holder 16 to the circumferential direction of the outer side boom material 4 separately. Can do. For this reason, the position shift of the holder 16 in the circumferential direction of the outer boom member 4 can be prevented while preventing an increase in the number of members.

  Moreover, in the said 1st Embodiment, the labor 16 and the slide pad 14 from the regular installation position of the holder 16 and the slide pad 14 are reduced, reducing the labor required for the operation | work which installs the holder 16 and the slide pad 14 on the inner surface of the lower part of the outer side boom material 4. Separation can be effectively prevented. Specifically, in the first embodiment, the holder 16 includes a plurality of divided holders 26 (one bottom holder 26 a and two side holders 26 b) and a connecting member 28 that can be attached to and detached from the divided holder 26. The connecting members 28 are attached to the divided holders 26 so as to connect the adjacent divided holders 26 to each other. Therefore, if the connecting members 28 are removed from the divided holders 26, the divided holders 26 are separated from each other. Can do. For this reason, in the said 1st Embodiment, since the holder 16 can be divided | segmented into the some division | segmentation holder 26 and can be separately installed on the inner surface of the lower part of the outer side boom material 4, the whole holder is integrally formed. Compared to the case where separation is not possible, the labor required to install the holder 16 and the slide pad 14 on the inner surface of the lower portion of the outer boom member 4 can be reduced. And after installing each division | segmentation holder 26 on the inner surface of the lower part of the outer side boom material 4, if the adjacent thing of those division | segmentation holders 26 is connected with the connection member 28, several division | segmentation holder 26 will be integrated and a holder will be integrated. 16 can be formed. The holder 16 integrated in this way is more stable than the respective divided holders 26 in a state where they are individually separated. For this reason, the detachment | leave from the regular installation position of the holder 16 and the slide pad 14 can be prevented effectively.

  In the first embodiment, an insertion groove 26h is formed at one end portion in the circumferential direction of the bottom holder 26a, and one end portion in the circumferential direction of one side holder 26b disposed so as to face the one end portion. An insertion groove 26r is formed on the other end, an insertion groove 26h is formed on the other end in the circumferential direction of the bottom holder 26a, and one end in the circumferential direction of the other side holder 26b disposed to face the other end. An insertion groove 26r is formed in the portion. These insertion grooves 26h and 26r are configured such that the connecting member 28 can be inserted and removed from the front end side of the outer boom member 4, so that the bottom holder 26a and the two side holders 26b are separated from each other on the outer side. After installing in the space between the lower inner surface of the boom member 4 and the lower outer surface of the inner boom member 5, the connecting member 28 is inserted into the insertion groove 26h of the bottom holder 26a and the insertion groove 26r of the side holder 26b adjacent to each other. The bottom holder 26a and the side holder 26b adjacent to each other can be connected to each other by being inserted from the front end side of the outer boom member 4. That is, in the said 1st Embodiment, since the connection operation | work of the division | segmentation holders 26 adjacent from the outer side of the front end of the outer side boom material 4 can be performed, between the inner surface of the outer side boom material 4 and the outer surface of the inner side boom material 5. Compared to a configuration in which it is necessary to perform a connecting operation between adjacent divided holders in the space, the connecting operation can be easily performed.

(Second Embodiment)
Next, with reference to FIG. 10, the structure of the slide support apparatus 12 by 2nd Embodiment of this invention is demonstrated.

  The slide support device 12 according to the second embodiment of the present invention includes a holder for preventing the front end portion of the holder 16 from floating in addition to the rear end floating prevention portion 22a for preventing the rear end portion of the holder 16 from floating. A front end levitation preventing portion 30 is provided, and the lifting of both the rear end portion and the front end portion of the holder 16 installed on the inner surface of the lower portion of the outer boom member 4 is suppressed.

  Specifically, the holder front end levitation prevention unit 30 is configured such that the front side restricting part 20 is fastened to the collar 4a at the front end part of the lower part of the outer boom member 4 and the rear end side of the outer boom member 4 from the front side restricting part 20. It protrudes into the front end portion of the holder 16 from its front end surface, and prevents the front end portion of the holder 16 from floating from the inner surface of the lower portion of the outer boom member 4. Specifically, the holder front end levitation prevention unit 30 includes a plurality of holder fixing screws 30a for screwing the front end of the holder 16 to prevent the front end of the holder 16 from floating. In addition, among the front side split restricting portions 20 a constituting the front side restricting portion 20, the nuclear front side split restricting portion 20 a is fastened to the front end portion of the holder 16 in a state of being fastened to the collar 4 a of the front end portion of the lower portion of the outer boom member 4. A holder fixing screw hole 20c that penetrates the part in the axial direction (front-rear direction) of the outer boom member 4 is formed in the part that comes into contact with the outer boom member 4. The holder fixing screw 30a has a pointed tip, and this tip protrudes from the holder fixing screw hole 20c to the rear end side of the outer boom member 4 and bites into the holder 16 from the front end surface of the holder 16. Thus, it is screwed into the holder fixing screw hole 20c from the front side. In the second embodiment, a hook screw is used as the holder fixing screw 30a. However, a screw of a type other than the hook screw may be used as the holder fixing screw 30a. For example, various screws having a head may be used as the holder fixing screw 30a. Further, in the second embodiment, the plurality of holder fixing screw holes 20c are provided at respective positions at predetermined intervals in the circumferential direction of the outer boom member 4 in the front restricting portion 20 (each divided front restricting portion 20a). Each holder fixing screw 30a screwed into a holder fixing screw hole 20c provided at each location fixes the front end of the holder 16 at each location.

  The rest of the configuration of the slide support device 12 according to the second embodiment is the same as the configuration of the slide support device 12 according to the first embodiment.

  The installation method of the slide support device 12 according to the second embodiment is basically the same as the installation method of the slide support device 12 according to the first embodiment. However, in the second embodiment, the outer boom member 4 is used. After attaching (fastening) the front side restricting portion 20 to the front end portion, the holder fixing screw 30a is screwed into the holder fixing screw hole 20c to fix the front end portion of the holder 16.

  In this 2nd Embodiment, since the floating prevention part 22 which comprises the slide support apparatus 12 has the holder front end floating prevention part 30 in addition to the rear end floating prevention part 22a, from the inner surface of the lower part of the outer side boom material 4 In addition to lifting of the rear end portion of the holder 16, lifting of the front end portion of the holder 16 can be effectively prevented, and the holder 16 and the slide pad 14 installed on the inner surface of the lower portion of the outer boom member 4 are properly Detachment from the installation position can be prevented more reliably. And in this 2nd Embodiment, since the holder front end levitation | blocking prevention part 30 prevents the front end part of the holder 16 from rising, it can suppress effectively that the front end part of the holder 16 gets over the front side control part 20 especially. It is possible to more effectively prevent the holder 16 and the slide pad 14 from separating from the normal installation position toward the front end side of the outer boom member 4.

  Further, in the second embodiment, the holder fixing screw 30a constituting the holder front end levitation preventing portion 30 is attached to the front end portion of the holder 16 in a state where the holder fixing screw 30a is attached to the front end portion of the outer boom member 4 in the front side restricting portion 20. Since the front-end | tip part bites into the holder 16 from the front-end surface of the holder 16, it is screwed in from the front side to the holder fixing screw hole 20c formed in the site | part contact | abutted from the front boom part 4 of the outer boom material 4. When the holder fixing screw 30a is simply screwed into the holder fixing screw hole 20c from the front side while being attached to the front end portion, the front end portion of the holder 16 can be prevented from being lifted. For this reason, in order to prevent the front end portion of the holder 16 from being lifted, the front regulating portion 20 is once removed from the front end portion of the outer boom member 4, and then the front end portion of the holder 16 is fixed to the inner surface of the outer boom member 4 with some fixture. Compared to the configuration in which the holder 16 is fixed, the fixing operation of the front end portion of the holder 16 for preventing the front end portion of the holder 16 from being lifted can be simplified.

  In the second embodiment, since the holder fixing screw 30a positively presses and fixes the holder 16 against the rear side restricting portion 18, the holder is fixed at a proper installation position on the inner surface of the lower portion of the outer boom member 4. 16 can be fixed more firmly. For this reason, it is possible to more reliably prevent the holder 16 and the slide pad 14 held by the holder 16 from being lifted.

  The effects of the second embodiment other than those described above are the same as the effects of the first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  For example, as in the first modification of the second embodiment shown in FIG. 11, the holder 16 is installed at a regular installation position on the inner surface of the lower portion of the outer boom member 4, and the front side regulating portion 20 is the outer boom member 4. A plurality of insertion holes 16a communicating with the plurality of holder fixing screw holes 20c provided in the front regulating portion 20 so as to be substantially coaxial with each other in a state of being fastened to the collar 4a of the lower front end portion of It may be formed at the front end of the holder 16 (the bottom holder 26a and the side holder 26b). In this first modification, the tip of the holder fixing screw 30a screwed into the holder fixing screw hole 20c from the front side corresponds to the corresponding insertion hole 16a formed in the front end of the holder 16, respectively. It is inserted. The tip of the holder fixing screw 30a inserted into the insertion hole 16a is applied to the force applied to the holder 16 from the inner surface of the lower portion of the outer boom member 4 toward the outer surface of the lower portion of the inner boom member 5. In order to oppose, the front end portion of the holder 16 is in contact with the portion located on the inner surface side of the outer boom member 4 with respect to the insertion hole 16 a of the front end portion of the holder 16, and the front end portion of the holder 16 is the lower portion of the outer boom member 4. Displacement in the direction from the inner surface toward the outer surface of the lower portion of the inner boom member 5 is prevented. In this modification, the tip of the holder fixing screw 30a does not bite into (does not screw into) the front end surface of the holder 16, so the tip of the holder fixing screw 30a does not need to be sharp.

  Further, as in the second modification of the second embodiment shown in FIG. 12, the pad front end levitation preventing portion 32 prevents the front end portion of the slide pad 14 from being lifted, so that The front end portion of the holder 16 installed at the regular installation position and the front end portion of the slide pad 14 held by the holder 16 may be prevented from floating from the inner surface of the lower portion of the outer boom member 4.

  Specifically, the slide support device 12 according to the second modification includes a pad front end levitation prevention unit 32 provided in the front regulating unit 20 instead of the holder front end levitation prevention unit 30. The pad front end floating prevention portion 32 protrudes from the front regulating portion 20 attached to the front end portion of the outer boom member 4 to the rear end side of the outer boom member 4 and enters the front end portion of the slide pad 14 from its front end surface. This is to prevent the front end of the pad 14 and the front end of the holder 16 from floating from the inner surface of the lower portion of the outer boom member 4. Specifically, the pad front end floating prevention portion 32 includes a plurality of pad fixing screws 32a for screwing the front end portion of the slide pad 14 to prevent the front end portion of the slide pad 14 from floating. Each front division restricting portion 20a constituting the front restricting portion 20 has an inner boom that is closer to the inner end than the front end portion of the holder 16 in a state where the nuclear front division restricting portion 20a is fastened to the collar 4a of the lower front end portion of the outer boom member 4. It has a part which protrudes to the outer surface side of the lower part of the material 5 (the axial center side of the telescopic boom 2) and faces the front end surface of the slide pad 14. In this portion, a pad fixing screw hole 20d is formed through the portion in the axial direction (front-rear direction) of the outer boom member 4. The pad fixing screw 32 a has a pointed tip, and the tip protrudes from the pad fixing screw hole 20 d to the rear end side of the outer boom member 4 so as to be held by the holder 16. From the front side so as to bite into the front end of the pad fixing screw hole 20d. In this modification, a hook screw is used as the pad fixing screw 32a. However, a screw of a type other than the hook screw may be used as the pad fixing screw 32a. For example, various screws having a head may be used as the pad fixing screw 32a. Further, the plurality of pad fixing screw holes 20d are provided at respective positions at predetermined intervals in the circumferential direction of the outer boom member 4 in the front side restricting portion 20 (each front side dividing restricting portion 20a). Each pad fixing screw 32a screwed into the provided pad fixing screw hole 20d fixes the front end portion of the slide pad 14 at each location.

  The installation method of the slide support device 12 according to the second modification is basically the same as the installation method of the slide support device 12 according to the second embodiment, but in the second modification, the front end of the outer boom member 4 is used. After attaching (fastening) the front regulating part 20 to the part, instead of the operation of screwing the holder fixing screw 30a into the holder fixing screw hole 20c and fixing the front end part of the holder 16, the pad fixing screw An operation of fixing the front end portion of the slide pad 14 and the front end portion of the holder 16 by screwing the pad fixing screw 32a into the hole 20d is performed.

  In the second modification, in addition to preventing the rear end portion of the holder 16 from lifting from the inner surface of the lower portion of the outer boom member 4 by the rear end floating prevention portion 22a, the front end of the slide pad 14 by the pad front end floating prevention portion 32 is provided. Since the floating of the front end portion of the head portion and the holder 16 can be prevented, the regular installation positions of the holder 16 and the slide pad 14 installed on the inner surface of the lower portion of the outer boom member 4 are the same as in the second embodiment. It is possible to prevent the separation from the vehicle more reliably.

  Further, in this second modification, the pad front end levitation preventing portion 32 prevents the front end portion of the slide pad 14 and the front end portion of the holder 16 from rising, so that the front end portion of the slide pad 14 and the front end portion of the holder 16 are particularly It is possible to effectively prevent the front restricting portion 20 from being overcome, and it is possible to more effectively prevent the holder 16 and the slide pad 14 from separating from the regular installation position to the front end side of the outer boom member 4.

  Further, in the second modification, the pad fixing screw 32a is screwed into the pad fixing screw hole 20d of the front regulating portion 20 from the front side in a state where the front regulating portion 20 is attached to the front end portion of the outer boom member 4. Only the front end of the slide pad 14 and the front end of the holder 16 can be prevented from rising. For this reason, also in this 2nd modification, the fixing operation | work of the front-end part for preventing the lift of the front-end part of the holder 16 can be simplified like the said 2nd Embodiment.

  Further, in this second modification, the pad fixing screw 32a bites into the front end surface of the slide pad 14 and prevents the front end portion of the slide pad 14 from being lifted, so that the front end portion of the slide pad 14 held by the holder 16 is It is possible to more reliably prevent the holder 16 from floating. For this reason, it is possible to more effectively prevent the slide pad 14 held by the holder 16 from being detached from the holder 16.

  The effects of the second modification other than those described above are the same as the effects of the second embodiment.

  Moreover, the structure other than said structure may be sufficient as the structure of the part which mounts a connection member among the connection member which connects adjacent parts of the some division | segmentation holder which comprises a holder, and a division | segmentation holder.

  Further, the holder is formed integrally as a whole and may not be divided as described above.

  In addition, as the installation position and the number of installation of the rear end floating prevention unit, the rear end sandwiched unit, the circumferential movement restriction unit, the front end floating prevention unit and the front end sandwiched unit, various installation positions and installation numbers other than the above are applied. Is possible. However, the number of installed rear end floating prevention units, rear end sandwiched units, circumferential movement restriction units, front end floating prevention units, and front end sandwiched units may be less than the number of slide pads held by the holder. From the viewpoint of reduction of As described above, since the holder collectively holds a plurality of slide pads, the rear end levitation prevention unit, the rear end clamping unit, the circumferential movement restriction unit, the front end levitation prevention unit, and the front end clamping unit are Even if the number of slide pads held by the holder is smaller than that, all the slide pads held by the holder can be fixed via the holder by fixing the holder. Therefore, in this configuration, the number of members is significantly reduced compared to a configuration in which a plurality of slide pads installed on the inner surface of the lower portion of the outer boom member are fixed to the outer boom member one by one with individual fixing tools. , It is possible to realize the secure fixing of all the slide pads.

  Further, the levitation preventing portion for preventing the holder and the slide pad from lifting from the inner surface of the lower portion of the outer boom member 4 is not limited to the one having the above-described configuration, and the levitation preventing portion having various configurations other than the above is prevented. It can be used as a part.

  For example, using a rod-shaped or wire-shaped member that is arranged so as to extend from the rear to the front of the regular installation position of the holder inside the outer boom member and the position relative to the outer boom member is fixed as the floating prevention unit Also good. In this case, a groove or a through hole in which the rod-like or wire-like member is engaged is formed in the holder so as to extend in the front-rear direction, and when the holder is installed on the inner surface of the lower portion of the outer boom member, the holder By engaging the rod-shaped or wire-shaped floating prevention portion with the groove or through hole of the outer boom material, and then fixing the front end portion of the floating prevention portion to the front side restriction portion attached to the front end portion of the lower portion of the outer boom material, You may make it prevent a holder's lift by the floating prevention part. Further, a groove or a through hole in which the rod-like or wire-like member is engaged with the slide pad is formed to extend in the front-rear direction, and when the holder and the slide pad are installed on the inner surface of the lower part of the outer boom member, Engaging the rod-shaped or wire-shaped floating prevention portion with the groove or the through hole of the slide pad, and then fixing the front end portion of the floating prevention portion to the front side regulating portion attached to the front end portion of the lower portion of the outer boom material Accordingly, the floating prevention portion may prevent the holder and the slide pad from floating.

2 Telescopic boom 4 Outer boom member 5 Inner boom member 12 Slide support device 14 Slide pad 16 Holder 18 Rear side restricting portion 20 Front side restricting portion 20c Holder fixing screw hole 20d Pad fixing screw hole 22 Lifting prevention portion 22a Rear end floating prevention Portion 26 Split holders 26f, 26p Rear end sandwiched portions 26h, 26r Insertion groove 28 Connecting member 30 Holder front end floating prevention portion 30a Holder fixing screw 32 Pad front end floating prevention portion 32a Pad fixing screw

Claims (11)

Expansion and contraction of a construction machine that includes an outer boom member formed in a cylindrical shape and an inner boom member inserted into the outer boom member and expands and contracts by relative movement of the inner boom member in the axial direction with respect to the outer boom member. A slide support device for supporting the inner boom member so that the inner boom member is slidable in an axial direction in a state of being provided on a boom and fixed to an inner surface of a lower portion of the outer boom member;
A plurality of slide pads each having a sliding contact surface in sliding contact with the outer surface of the lower portion of the inner boom member;
Arranged on the inner surface of the lower portion of the outer boom member, the plurality of slide pads are arranged at a plurality of positions aligned in the circumferential direction of the outer boom member in a posture in which their sliding contact surfaces are in sliding contact with the outer surface of the inner boom member. A holder to hold,
A rear regulating portion provided on an inner surface of a lower portion of the outer boom material, and abutting from a rear side on a rear end portion of the holder so as to prevent the holder from moving to a rear end side of the outer boom material;
A front regulating portion attached to the front end portion of the outer boom material, and abutting from the front side on the front end portion of the holder so as to prevent the holder from moving to the front end side of the outer boom material;
A slide support device, comprising: a floating prevention unit that sandwiches a specific portion of the holder with an inner surface of a lower part of the outer boom member and prevents the holder from floating from an inner surface of the lower part of the outer boom member. The holder has a rear end sandwiched portion sandwiched between the levitation preventing portion and the lower inner surface of the outer boom member at a rear end portion thereof,
The levitation preventing portion is provided inside the outer boom material so that a relative position to the inner surface of the lower portion of the outer boom material is fixed, and a rear end portion of the holder is lifted from an inner surface of the lower portion of the outer boom material. 2. The slide support device according to claim 1, further comprising a rear end floating prevention unit that sandwiches the rear end sandwiched portion with an inner surface of a lower portion of the outer boom member so as to prevent the rear end sandwiched portion. The rear end levitation preventing portion is open to the inner surface of the lower portion of the outer boom member, the front end side of the outer boom member is opened, and the rear end sandwiched portion of the holder is connected to the front end of the outer boom member through the opening. Forming a gap inserted from the side toward the rear end side,
The slide support device according to claim 2, wherein the front side restricting portion is attached to the front end portion of the outer boom member so as to be detachable.   The holder is provided so as to be positioned on both sides of the rear end sandwiched portion in the circumferential direction of the outer boom member, and the rear end portion of the holder is prevented from moving in the circumferential direction of the outer boom member. 4. The slide support device according to claim 2, further comprising a circumferential movement restricting portion that comes into contact with the rear end floating prevention portion from both sides in the circumferential direction of the outer boom member. 5.   Protruding from the front regulating portion to the rear end side of the outer boom material in a state where the front regulating portion is attached to the front end portion of the outer boom member, and the front end is inserted into the front end portion of the holder. The slide support device according to any one of claims 2 to 4, further comprising a holder front end levitation prevention unit that enters from a surface and prevents the front end portion of the holder from floating from an inner surface of a lower portion of the outer boom member. A holder fixing screw that passes through the portion in the axial direction of the outer boom member in a portion that comes into contact with the front end portion of the holder from the front side in a state of being attached to the front end portion of the outer boom member in the front side restricting portion. A hole is formed,
The holder front end levitation preventing portion is screwed into the holder fixing screw hole from the front side so that a tip portion protrudes from the holder fixing screw hole to the rear end side of the outer boom member and enters the front end portion of the holder. The slide support device according to claim 5, wherein the slide support device is a holder fixing screw.   It is provided in the front side restricting part, and protrudes from the front side restricting part to the rear end side of the outer boom material in a state where the front side restricting part is attached to the front end part of the outer boom material, and enters the front end part of the slide pad. 5. The pad front end levitation preventing portion that enters from a front end surface and prevents the front end portion of the slide pad and the front end portion of the holder from floating from the inner surface of the outer boom member. Slide support device. The front regulating portion has a portion facing the front end surface of the slide pad that protrudes to the outer surface side of the inner boom material from the front end portion of the holder in a state of being attached to the front end portion of the outer boom material, The part is formed with a screw hole for fixing the pad that penetrates the part in the axial direction of the outer boom member,
The pad front end levitation prevention portion is for pad fixing such that a front end portion protrudes from the pad fixing screw hole toward the rear end side of the outer boom material and bites into the front end portion of the slide pad from the front end surface of the slide pad. The slide support device according to claim 7, which is a pad fixing screw that is screwed into the screw hole from the front side.   The holder is arranged on the inner surface of the lower part of the outer boom member so as to be aligned in the circumferential direction of the outer boom member, and each of the holders holds the plurality of slide pads so as to be aligned in the circumferential direction of the outer boom member. The split holder is configured to be attachable to and detachable from the split holder, and includes a connecting member that connects adjacent ones of the split holders in a state of being attached to the split holder. The slide support device according to claim 1. Each of the split holders has an insertion groove formed on the surface facing the other split holder adjacent in the circumferential direction of the outer boom member so as to extend from the front end to the rear side.
The connecting member is configured to be insertable / removable from the front end side of the outer boom member into the insertion groove of one of the division holders adjacent to each other and the insertion groove of the other division holder, respectively. The slide support device according to claim 9, wherein the adjacent divided holders are connected in a state of being inserted into the insertion grooves. A method of installing the slide support device according to claim 3 or 4 on the telescopic boom,
A rear side restriction part installation step of installing the rear side restriction part on the inner surface of the lower part of the outer boom member;
A rear end levitation prevention part attaching step for attaching the rear end levitation prevention part to the outer boom material such that the gap is formed between the rear end levitation prevention part and the inner surface of the lower part of the outer boom material;
A pad holding step for holding the slide pad in the holder;
A space between the inner surface of the lower portion of the outer boom material and the outer surface of the lower portion of the inner boom material from the front end side of the outer boom material in a state where the front side restricting portion is removed from the holder holding the slide pad. And the rear end portion of the holder is brought into contact with the rear regulating portion, and the rear end sandwiched portion of the holder is interposed between the rear end floating prevention portion and the lower inner surface of the outer boom member. An insertion step of inserting into the gap;
After the inserting step, a front side restricting part mounting step for attaching the front side restricting part to the front end part of the outer boom material so that the front side restricting part contacts the front end part of the holder from the front end side of the outer boom material. A method for installing the slide support device.

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