JP2016216209A

JP2016216209A - Greasing device for multistage telescopic boom, and multistage telescopic boom with the same

Info

Publication number: JP2016216209A
Application number: JP2015103827A
Authority: JP
Inventors: 木谷　友彦; Tomohiko Kitani; 友彦木谷
Original assignee: Furukawa Unic Corp
Current assignee: Furukawa Unic Corp
Priority date: 2015-05-21
Filing date: 2015-05-21
Publication date: 2016-12-22
Anticipated expiration: 2035-05-21
Also published as: JP6563688B2

Abstract

PROBLEM TO BE SOLVED: To decrease fitting places for a grease nipple and working holes while enabling greasing even when inner and outer boom slide plates do not overlap with each other.SOLUTION: A multistage telescopic boom 10 comprises a plurality of greasing devices 20 which divide grease supplied from a grease nipple 60 to grease slide plates 30 at two places of booms adjoining each other inside and outside. Each greasing device 20 has a fitting hole for one grease nipple 60, a lateral feed oil passage communicating therewith, and two grease discharge holes 55 for supplying grease simultaneously to between booms 2, 4 communicating with the lateral feed oil passage and fitted with the greasing device 20 and booms 3, 5 which are one stage inside the booms 2, 4, and to between the booms 2, 4 fitted with the greasing device 20 and booms 1, 3 which are one stage inside the booms 2, 4.SELECTED DRAWING: Figure 2

Description

本発明は、伸縮作動する入り子式の複数のブームを有する多段伸縮ブームに係り、特に、複数のブーム相互間の摺接部に設けた摺動板に給脂をする給脂装置に関する。 The present invention relates to a multistage telescopic boom having a plurality of telescoping booms that extend and retract, and particularly to a grease supply device that supplies grease to a sliding plate provided in a sliding contact portion between the plurality of booms.

例えばトラック等の車両に架装される油圧クレーンには、基端側から先端側に順次摺動自在に嵌挿された複数のブームを有する多段伸縮ブームが多く用いられている。この種の多段伸縮ブームでは、その複数のブームが多段の入れ子型をなしており、複数のブームが伸縮機構の作動に応じて伸縮される。
この種の多段伸縮ブームでは、複数のブームの伸縮を円滑に案内するために、隣接するブーム間の摺接部に摺動板が設けられている。そして、この摺動板の摺動面に、定期的にグリス等の油脂をグリスニップルから給脂することで、複数のブームの円滑な伸縮作動を行わせている。
ここで、特許文献１に記載の技術では、最縮小状態において隣接するブーム内外の摺動板同士が重なり合う多段伸縮ブームにおいて、一度の給脂で複数の摺動板の摺動面に給脂可能な構造が開示されている。このような構成であれば、グリスニップルの取り付け箇所を減らすとともに給脂のための作業用穴も減らすことができる。 For example, in a hydraulic crane mounted on a vehicle such as a truck, a multistage telescopic boom having a plurality of booms that are slidably inserted sequentially from the base end side to the tip end side is often used. In this type of multi-stage telescopic boom, the plurality of booms are multi-stage nested, and the plurality of booms are expanded and contracted according to the operation of the telescopic mechanism.
In this type of multistage telescopic boom, a sliding plate is provided at a sliding contact portion between adjacent booms in order to smoothly guide the expansion and contraction of a plurality of booms. Then, grease such as grease is periodically supplied from the grease nipple to the sliding surface of the sliding plate, so that a plurality of booms can be smoothly expanded and contracted.
Here, in the technique described in Patent Document 1, in the multistage telescopic boom in which the sliding plates inside and outside the adjacent booms overlap in the most contracted state, the sliding surfaces of the plurality of sliding plates can be lubricated with a single greasing. The structure is disclosed. If it is such a structure, the installation location of a grease nipple can be reduced and the work hole for greasing can also be reduced.

実開昭６０−１９５８４号公報Japanese Utility Model Publication No. 60-19584 実開昭４７−３０３７１号公報Japanese Utility Model Publication No. 47-30371

しかしながら、入り子式の複数のブーム同士の摺動板は、ブーム最縮小時において、隣接するブーム内外の摺動板同士が重なり合うように連装されるとは限らない。つまり、多段伸縮ブームを最縮小した場合に、隣接するブーム内外の摺動板同士が重なり合わない多段伸縮ブームがある。
ここで、通常、ブーム伸縮用の油圧シリンダ及び伸縮に要する装置は、最も内側となる先端ブーム内に設けられる。そして、油圧シリンダの取り付けは、その基端部が、基礎となる外側ブームの基端部に取付ピンを介して枢支されるとともに、油圧シリンダの可動部が、伸縮させたい内側ブームの基端部に取付ピンを介して枢支される。 However, the sliding plates between the plurality of telescopic booms are not always connected so that the sliding plates inside and outside the adjacent booms overlap each other when the boom is contracted to the minimum. That is, there is a multistage telescopic boom in which the sliding plates inside and outside the adjacent booms do not overlap when the multistage telescopic boom is reduced to the minimum.
Here, the hydraulic cylinder for boom expansion and contraction and the device required for expansion and contraction are usually provided in the innermost end boom. The base end of the hydraulic cylinder is pivotally supported by the base end of the base outer boom via a mounting pin, and the movable part of the hydraulic cylinder is connected to the base end of the inner boom to be expanded and contracted. It is pivotally supported by the part via a mounting pin.

そこで、この種の多段伸縮ブームにおいて、例えば特許文献２記載の技術では、外側ブームの基端部が内側ブームよりも突出するように、内側ブームの基端部の位置を外側の取付ピンの位置よりも短くしている。これらは、ブームを伸長させた状態では、各ブーム毎の取付ピンが露出する構造のため、ブームに油圧シリンダを取付ける際の組立容易性に大きく寄与する。つまり、隣接するブーム内外の摺動板同士が重なり合わなくなっても、この構造の方が都合良いのである。これにより、同文献記載の多段伸縮ブームでは、外側ブームの突出部から取付ピンを装着するときに、取付ピンが内側ブームに干渉することなく油圧シリンダの基端部を軸支可能としている（例えば特許文献２の図２参照）。 Therefore, in this type of multistage telescopic boom, for example, in the technique described in Patent Document 2, the position of the base end portion of the inner boom is set to the position of the outer mounting pin so that the base end portion of the outer boom protrudes from the inner boom. Shorter than that. Since the mounting pins for each boom are exposed when the boom is extended, these greatly contribute to the ease of assembly when attaching the hydraulic cylinder to the boom. That is, even if the sliding plates inside and outside the adjacent booms do not overlap each other, this structure is more convenient. Thereby, in the multistage telescopic boom described in the same document, when the mounting pin is mounted from the protruding portion of the outer boom, the base end portion of the hydraulic cylinder can be pivotally supported without the mounting pin interfering with the inner boom (for example, (Refer FIG. 2 of patent document 2).

これに対し、特許文献１に記載の技術は、隣接するブーム内外の摺動板同士が重なり合うことが必須要件となるため、上記特許文献２記載の多段伸縮ブームの場合には採用できないという問題がある。
そこで、本発明は、グリスニップルの取り付け箇所を減らすとともに作業用穴も減らすことができ、内外のブーム摺動板同士が重なり合わなくとも複数のブーム摺動板に同時に給脂をすることができる多段伸縮ブーム用給脂装置およびこれを備える多段伸縮ブームを提供することを課題とする。 On the other hand, the technique described in Patent Document 1 has a problem that it cannot be adopted in the case of the multistage telescopic boom described in Patent Document 2 because it is essential that the sliding plates inside and outside adjacent booms overlap each other. is there.
Therefore, the present invention can reduce the number of locations where grease nipples are attached and the number of work holes, and can simultaneously lubricate a plurality of boom sliding plates without overlapping the inner and outer boom sliding plates. It is an object of the present invention to provide a greasing device for a multistage telescopic boom and a multistage telescopic boom provided with the same.

上記課題を解決するために、本発明の一態様に係る多段伸縮ブーム用給脂装置は、基端側から先端側に順次摺動自在に嵌挿された複数のブームと、それら複数のブームのうち隣接するブーム間に設けられた摺動板とを有する多段伸縮ブームに用いられる給脂装置であって、１つのグリスニップルから給脂されたグリスを分割して内外で隣接するブームの２箇所の摺動板に給脂する給脂構造を備え、前記給脂構造は、前記グリスニップルが装着されるニップル取付孔と、当該給脂構造を設けるブームよりも内方側の摺動板がブーム伸縮時に通過する軌道と向き合う位置に開口して当該給脂構造を設けるブームとその１段内側のブームとの間にグリスを給脂する第一グリス吐出孔と、当該給脂構造を設けるブームの摺動板がブーム伸縮時に通過する軌道と向き合う位置に開口して当該給脂構造を設けるブームとその１段外側のブームとの間にグリスを給脂する第二グリス吐出孔と、前記ニップル取付孔に対して前記第一グリス吐出孔および前記第二グリス吐出孔をそれぞれ連通させる横送り油路とを有することを特徴とする。 In order to solve the above-described problem, a grease supply device for a multistage telescopic boom according to one aspect of the present invention includes a plurality of booms that are slidably inserted sequentially from a proximal end side to a distal end side, and the plurality of booms. It is a greasing device used for a multistage telescopic boom having a sliding plate provided between adjacent booms, wherein the grease fed from one grease nipple is divided into two locations on the inside and outside adjacent booms A grease supply structure for supplying grease to the sliding plate, and the grease supply structure includes a nipple mounting hole in which the grease nipple is mounted, and a sliding plate on the inner side of the boom provided with the grease supplying structure. A first grease discharge hole for supplying grease between a boom that opens to a position facing a track that passes during expansion and contraction and provides the grease supply structure and a boom inside the first stage, and a boom that provides the grease supply structure The sliding plate passes when the boom extends and retracts A second grease discharge hole for supplying grease between a boom which is opened at a position facing the track and provided with the grease supplying structure, and a boom on the outer side of the first stage; and the first grease discharge with respect to the nipple mounting hole It has a transverse feed oil passage which makes a hole and said 2nd grease discharge hole communicate, respectively.

また、上記課題を解決するために、本発明の一態様に係る多段伸縮ブームは、本発明の一態様に係る多段伸縮ブーム用給脂装置を備えることを特徴とする。
ここで、本発明の一態様に係る多段伸縮ブーム用給脂装置において、前記第一グリス吐出孔と前記第二グリス吐出孔とは、相互の流路断面積および流路長さが同じであることは好ましい。また、前記第一グリス吐出孔は、前記給脂構造を設けるブーム自体に形成された貫通孔であることは好ましい。 Moreover, in order to solve the said subject, the multistage expansion-contraction boom which concerns on 1 aspect of this invention is equipped with the greasing apparatus for multistage expansion-contraction booms which concerns on 1 aspect of this invention, It is characterized by the above-mentioned.
Here, in the grease supply device for a multistage telescopic boom according to one aspect of the present invention, the first grease discharge hole and the second grease discharge hole have the same flow path cross-sectional area and flow path length. It is preferable. Moreover, it is preferable that the said 1st grease discharge hole is a through-hole formed in boom itself which provides the said grease supply structure.

また、本発明の一態様に係る多段伸縮ブーム用給脂装置において、前記第一グリス吐出孔の出口は、前記給脂構造を設けるブームのブーム内壁面と前記給脂構造を設けるブームの１段内側のブームに設けられた摺動板の前方上面との間の空間にグリスが溜まる第一グリス溜まり部になっており、前記第二グリス吐出孔の出口は、前記給脂構造を設けるブームの１段外側のブームのブーム内壁面と前記第二グリス吐出孔の出口の上面との間の空間にグリスが溜まる第二グリス溜まり部になっていることは好ましい。 Further, in the greasing device for a multistage telescopic boom according to one aspect of the present invention, the outlet of the first grease discharge hole is a boom inner wall surface of the boom provided with the grease supplying structure and a first stage of the boom provided with the grease supplying structure. It is a first grease reservoir where grease accumulates in a space between the front upper surface of the sliding plate provided on the inner boom, and the outlet of the second grease discharge hole is the boom provided with the grease supply structure It is preferable that a second grease reservoir portion is formed in which grease accumulates in a space between the boom inner wall surface of the first stage outer boom and the upper surface of the outlet of the second grease discharge hole.

また、本発明の一態様に係る多段伸縮ブーム用給脂装置において、前記給脂構造は、当該給脂構造を設けるブームの上面に溶接されるニップル取付台座を有し、当該ニップル取付台座には、その上面側に前記ニップル取付孔が形成されるとともに、前記ニップル取付孔に連通して当該ニップル取付台座の底面全幅に渡って設けられた凹溝が形成されており、前記横送り油路は、前記凹溝両端の開口部が当該給脂構造を設けるブームの上面への溶接で塞がれることにより、当該給脂構造を設けるブームの上面と当該ニップル取付台座の底面との間に形成されることは好ましい。 Further, in the greasing device for a multistage telescopic boom according to one aspect of the present invention, the greasing structure has a nipple mounting base welded to an upper surface of a boom on which the greasing structure is provided, and the nipple mounting base includes The nipple mounting hole is formed on the upper surface side, and a concave groove is formed in communication with the nipple mounting hole and is provided over the entire bottom surface of the nipple mounting base. The openings at both ends of the concave groove are closed by welding to the upper surface of the boom provided with the greasing structure, thereby forming between the upper surface of the boom providing the greasing structure and the bottom surface of the nipple mounting base. It is preferable.

本発明の一態様に係る多段伸縮ブーム用給脂装置によれば、給脂構造は、グリスニップルが装着されるニップル取付孔と、ニップル取付孔と二つのグリス吐出孔とを連通する横送り油路とを有し、二つのグリス吐出孔は、第一グリス吐出孔が、当該給脂構造を設けるブームよりも内方側の摺動板がブーム伸縮時に通過する軌道と向き合う位置に開口して当該給脂構造を設けるブームとその１段内側のブームとの間にグリスを給脂し、第二グリス吐出孔が、当該給脂構造を設けるブームの摺動板がブーム伸縮時に通過する軌道と向き合う位置に開口して当該給脂構造を設けるブームとその１段外側のブームとの間にグリスを給脂するので、グリスニップルから供給されたグリスを横送り油路を介して二つのグリス吐出孔から、グリスニップルの装着位置よりも離隔して内外で隣接するブーム間に配置された摺動板とブーム伸縮時に重なる位置まで給脂できる。そのため、内外のブーム間に配置した給脂部材の位置を、内外のブームの摺動板に干渉しないように配置することができる。したがって、本発明の一態様に係る多段伸縮ブーム用給脂装置によれば、内外のブーム摺動板同士が重なり合わなくとも、内外の摺動板に向けてグリスニップルから供給されたグリスを複数のブーム摺動板に同時に給脂することができる。 According to the greasing device for a multistage telescopic boom according to one aspect of the present invention, the greasing structure includes a nipple mounting hole to which a grease nipple is mounted, a lateral feed oil that communicates the nipple mounting hole and the two grease discharge holes. The two grease discharge holes are opened at a position where the first grease discharge hole faces the track through which the sliding plate on the inner side of the boom provided with the grease supply structure passes when the boom is extended and contracted. Grease is supplied between the boom providing the grease supply structure and the boom inside the first stage, and the second grease discharge hole is a track through which the sliding plate of the boom providing the grease supply structure passes when the boom is extended and contracted. Since grease is supplied between the boom that opens at the facing position and the boom is provided with the grease supply structure and the boom outside the first stage, the grease supplied from the grease nipple is discharged through the lateral feed oil passage. From the hole, the grease nipple Wear can position lubrication to overlap when spaced apart from the sliding plate and the boom telescopic arranged between the boom adjacent inside and outside than the position. Therefore, the position of the greasing member arranged between the inner and outer booms can be arranged so as not to interfere with the sliding plates of the inner and outer booms. Therefore, according to the greasing device for a multistage telescopic boom according to one aspect of the present invention, a plurality of greases supplied from the grease nipple toward the inner and outer sliding plates can be obtained without overlapping the inner and outer boom sliding plates. The boom sliding plate can be lubricated simultaneously.

そして、第一グリス吐出孔と第二グリス吐出孔は、給脂構造を設けるブームと当該ブームの１段内側のブームとの間と、給脂構造を設けるブームと当該ブームの１段外側のブームとの間にグリスを給脂するように横送り油路に連通して設けられているので、給脂構造に設ける１箇所のグリスニップルから内外の複数のブーム２段分の２箇所の摺動板に同時に給脂をすることができる。したがって、本発明の一態様に係る多段伸縮ブーム用給脂装置によれば、グリスニップルの取り付け箇所を減らすことができ、また、作業用穴も減らすことができる。 The first grease discharge hole and the second grease discharge hole are provided between the boom providing the grease supply structure and the boom inside the first stage of the boom, the boom providing the grease supply structure, and the boom outside the first stage of the boom. Is provided in communication with the lateral feed oil passage so that grease is supplied between the two and two slides for two or more booms inside and outside from one grease nipple provided in the grease supply structure. The board can be lubricated simultaneously. Therefore, according to the greasing device for a multistage telescopic boom according to one aspect of the present invention, it is possible to reduce the number of locations where the grease nipple is attached and also reduce the number of work holes.

上述のように、本発明によれば、内外のブーム摺動板同士が重なり合わなくとも給脂をすることができ、グリスニップルの取り付け箇所を減らすことができ、また、作業用穴も減らすことができる。 As described above, according to the present invention, grease can be supplied without overlapping the inner and outer boom sliding plates, the number of grease nipple attachment locations can be reduced, and the number of work holes can also be reduced. Can do.

本発明の一態様に係る伸縮ブーム用給脂装置を備える多段伸縮ブームの第一実施形態の側面図であり、同図では要部を破断して示している。BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of 1st embodiment of the multistage expansion-contraction boom provided with the grease supply apparatus for the expansion-contraction boom which concerns on 1 aspect of this invention, In the same figure, the principal part is fractured | ruptured and shown. 図１のＺ−Ｚ断面（多段伸縮ブームの横断面）の拡大図である。It is an enlarged view of the ZZ cross section (transverse cross section of a multistage expansion-contraction boom) of FIG. ニップル取付台座（給脂部材）の説明図(ａ)〜(ｅ)であり、同図(ａ)は平面図、(ｂ)は左側面図、(ｃ)は(ａ)のＹ−Ｙ断面図、(ｄ)は右側面図、(ｅ)は底面図である。It is explanatory drawing (a)-(e) of a nipple mounting base (greasing member), the figure (a) is a top view, (b) is a left view, (c) is a YY cross section of (a). (D) is a right side view, and (e) is a bottom view. 本発明の一態様に係る多段伸縮ブームへの給脂方法の第一実施形態を説明する図であり、同図は、図１の要部を拡大して示している。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining 1st embodiment of the greasing method to the multistage expansion-contraction boom which concerns on 1 aspect of this invention, The figure has expanded and shown the principal part of FIG. 本発明の一態様に係る伸縮ブーム用給脂装置を備える多段伸縮ブームの第二実施形態の説明図であり、同図は、第一実施形態での図２（多段伸縮ブームの横断面）に対応する図を示している。It is explanatory drawing of 2nd embodiment of a multistage expansion-contraction boom provided with the grease supply apparatus for the expansion-contraction boom which concerns on 1 aspect of this invention, The figure is FIG. 2 (cross section of a multistage expansion-contraction boom) in 1st embodiment. The corresponding figure is shown. 本発明の一態様に係る多段伸縮ブームへの給脂方法の第二実施形態を説明する図であり、同図は、第一実施形態での図４に対応する図を示している。It is a figure explaining 2nd embodiment of the greasing method to the multistage expansion-contraction boom which concerns on 1 aspect of this invention, The figure has shown the figure corresponding to FIG. 4 in 1st embodiment.

以下、本発明の実施形態について、図面を適宜参照しつつ説明する。なお、各図面は模式的なものである。そのため、厚みと平面寸法との関係、比率等は現実のものとは異なることに留意すべきであり、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれている。また、以下に示す実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記の実施形態に特定するものではない。 Embodiments of the present invention will be described below with reference to the drawings as appropriate. Each drawing is schematic. For this reason, it should be noted that the relationship between the thickness and the planar dimension, the ratio, and the like are different from the actual ones, and the dimensional relationship and the ratio are different between the drawings. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, and arrangement of components. Etc. are not specified in the following embodiments.

第一実施形態では、図１に示すように、多段伸縮ブーム１０は、コラム６の上部に、起伏および伸縮自在に設けられる。本実施形態は、５段の入れ子型をなす例であって、複数のブーム１〜５を備えている。この多段伸縮ブーム１０は、車両搭載型の油圧クレーンに用いられる例であり、同図は多段伸縮ブーム１０を全縮小した状態を示すとともに、給脂装置の部分については縦断面にて図示している。
複数のブーム１〜５は、基端側（同図左側）のブームから順に、基端ブーム１、第１〜第３中間ブーム２，３，４および先端ブーム５が順次摺動自在に嵌挿されている。そして、これら複数のブーム１〜５のうち、第１〜第３中間ブーム２，３，４および先端ブーム５が不図示の伸縮機構の作動に応じて伸縮されるようになっている。コラム６にはウインチ７が装備され、このウインチ７から繰り出しおよび繰り込み可能にワイヤロープ８を導いてフック９に掛け回し、このフック９を多段伸縮ブーム１０の先端から吊り下げている。 In the first embodiment, as shown in FIG. 1, the multistage telescopic boom 10 is provided on an upper portion of the column 6 so as to be undulated and telescopic. The present embodiment is an example of a five-stage nesting type, and includes a plurality of booms 1 to 5. This multi-stage telescopic boom 10 is an example used for a vehicle-mounted hydraulic crane, and the figure shows a state in which the multi-stage telescopic boom 10 is fully reduced, and the greasing device is shown in a vertical cross section. Yes.
The plurality of booms 1 to 5 are inserted so that the proximal boom 1, the first to third intermediate booms 2, 3, 4 and the distal boom 5 are slidable sequentially in order from the boom on the proximal end side (left side in the figure). Has been. And among these several booms 1-5, the 1st-3rd intermediate | middle booms 2, 3, 4 and the front-end | tip boom 5 are expanded-contracted according to the action | operation of the expansion / contraction mechanism not shown. The column 6 is equipped with a winch 7. A wire rope 8 is guided so as to be drawn out and retracted from the winch 7, and is hung around the hook 9. The hook 9 is suspended from the tip of the multistage telescopic boom 10.

ここで、この多段伸縮ブーム１０には、同図に一部を破断して示すように、隣接するブーム間に設けられた摺動板３０と、摺動板３０の摺動面３０ｓにグリスを供給するための給脂装置２０が付設されている。以下、摺動板３０および給脂装置２０について詳しく説明する。
この多段伸縮ブーム１０は、図２に横断面を拡大図示するように、各ブーム１〜５の横断面が略六角形に形成されている。複数のブーム１〜５に対し、第１〜第３中間ブーム２，３，４および先端ブーム５の基端側の上面に、摺動板３０がそれぞれ付設されている。本実施形態では、摺動板３０は、略六角形状のブーム上面の左右の肩の位置２ヶ所にそれぞれ左右対称に配置されている。本実施形態の摺動板３０は、摺動板本体３２と、摺動板本体３２を保持する摺動板取付台座４０を有して構成されている。 Here, in this multistage telescopic boom 10, as shown in a partially broken view in the drawing, grease is applied to the sliding plate 30 provided between adjacent booms and the sliding surface 30 s of the sliding plate 30. A greasing device 20 for supplying is attached. Hereinafter, the sliding plate 30 and the greasing device 20 will be described in detail.
In this multistage telescopic boom 10, the cross sections of the booms 1 to 5 are formed in a substantially hexagonal shape as shown in FIG. For the plurality of booms 1 to 5, sliding plates 30 are respectively attached to the upper surfaces of the first to third intermediate booms 2, 3, 4 and the proximal end side of the distal end boom 5. In the present embodiment, the sliding plates 30 are arranged symmetrically at two positions on the left and right shoulders of the substantially hexagonal boom upper surface. The sliding plate 30 of the present embodiment includes a sliding plate main body 32 and a sliding plate mounting base 40 that holds the sliding plate main body 32.

各摺動板取付台座４０は、摺動板本体３２よりも一回り大きな形状を有する直方体状のブロック部材であり、上面に摺動板本体３２を収容する平面視が矩形状の凹部を有する。摺動板取付台座４０は、基部の周縁の適所がブーム上に溶接で固着されている。
各摺動板本体３２は、平面視が矩形状をなす板部材であり、各摺動板本体３２の上面が摺動面３０ｓになっている。摺動面３０ｓには、グリス溜まりとなる不図示の溝や凹部が形成されている。各摺動板本体３２は、摺動板取付台座４０の上面の矩形状の凹部内に収容されている。摺動板取付台座４０の矩形状の凹部の深さは、摺動板本体３２の厚さよりも浅く形成されている。
各摺動板本体３２は、摺動板取付台座４０の凹部によって周囲が拘束されることで第１〜第３中間ブーム２，３，４および先端ブーム５の上面に保持されている。これにより、各摺動板本体３２の摺動面３０ｓは、これに対向するブーム１〜４の内壁面に摺接することで第１〜第３中間ブーム２，３，４および先端ブーム５の伸縮を円滑に案内している。 Each sliding plate mounting base 40 is a rectangular parallelepiped block member having a shape that is slightly larger than the sliding plate main body 32, and has a concave portion that is rectangular in plan view for accommodating the sliding plate main body 32 on the upper surface. The sliding plate mounting base 40 is fixed to the boom at an appropriate position on the periphery of the base by welding.
Each sliding plate main body 32 is a plate member having a rectangular shape in plan view, and the upper surface of each sliding plate main body 32 is a sliding surface 30s. On the sliding surface 30s, a groove or a recess (not shown) serving as a grease reservoir is formed. Each sliding plate main body 32 is accommodated in a rectangular recess on the upper surface of the sliding plate mounting base 40. The depth of the rectangular concave portion of the sliding plate mounting base 40 is formed to be shallower than the thickness of the sliding plate main body 32.
Each sliding plate main body 32 is held on the upper surfaces of the first to third intermediate booms 2, 3, 4 and the tip boom 5 by being constrained by the concave portion of the sliding plate mounting base 40. Thereby, the sliding surface 30s of each sliding plate main body 32 is brought into sliding contact with the inner wall surface of the booms 1 to 4 opposed thereto, so that the first to third intermediate booms 2, 3, 4 and the distal end boom 5 are expanded and contracted. To guide you smoothly.

ここで、本実施形態の多段伸縮ブーム１０は、４段目の第３中間ブーム４および２段目の第１中間ブーム２が、給脂構造を設けるブームになっており、給脂装置２０は、これら第３中間ブーム４および第１中間ブーム２の左右の肩の位置の上面２箇所（多段伸縮ブーム１０全体として計４箇所）に左右対称となる位置に設けられている。
各給脂装置２０は、グリスニップル６０と、グリスニップル６０が装着されるニップル取付台座５０とを有する。各給脂装置２０のニップル取付台座５０は、隣接する外側ブームに対しては、その内側に隠伏状態となっている。例えば、第１中間ブーム２上および第３中間ブーム４上に設けられた給脂装置２０に装着したグリスニップル６０は、基端ブーム１の平面方向および側面方向から見ることができない。
そのため、多段伸縮ブーム１０を最縮小した状態で、多段伸縮ブーム１０の外側から、各給脂装置２０のグリスニップル６０に給脂可能にするために、各グリスニップル６０に対向する外側のブーム壁面全てに、グリス給脂用の貫通孔７０Ａ、Ｂ、Ｃが設けられている。なお、貫通孔７０Ａ、Ｂ、Ｃの孔径は、後で述べるグリス注入用グリスガンＧを用いてグリスを圧入可能なほどに十分開けられている。 Here, the multistage telescopic boom 10 of the present embodiment is a boom in which the third intermediate boom 4 in the fourth stage and the first intermediate boom 2 in the second stage are provided with a greasing structure. The upper and lower shoulders of the third intermediate boom 4 and the first intermediate boom 2 are provided at two positions on the upper surface (four positions as a whole of the multi-stage telescopic boom 10 in total).
Each greasing device 20 includes a grease nipple 60 and a nipple mounting base 50 on which the grease nipple 60 is mounted. The nipple mounting base 50 of each greasing device 20 is in a concealed state inside the adjacent outer boom. For example, the grease nipple 60 attached to the greasing device 20 provided on the first intermediate boom 2 and the third intermediate boom 4 cannot be seen from the planar direction and the side surface direction of the proximal boom 1.
Therefore, the outer boom wall surface facing each grease nipple 60 in order to enable the grease nipple 60 of each greasing device 20 to be greased from the outside of the multi-stage telescopic boom 10 with the multi-stage telescopic boom 10 contracted to the minimum. All are provided with through holes 70A, B, and C for grease supply. The diameters of the through holes 70A, B, and C are sufficiently large so that grease can be press-fitted using a grease gun G for injecting grease described later.

次に、上記ニップル取付台座５０の構造について説明する。
ニップル取付台座５０は、図３に示すように、段部が形成された直方体状のブロック部材であり、多段伸縮ブーム１０の幅方向を長手方向として給脂部材として装着される。ニップル取付台座５０の長手方向の一端（多段伸縮ブーム１０の中央の側）にはニップル取付面５９が段部により形成されている。ニップル取付面５９は、取り付けられるグリスニップル６０の高さの分だけ、ニップル取付面５９の高さが低くなっている。 Next, the structure of the nipple mounting base 50 will be described.
As shown in FIG. 3, the nipple mounting base 50 is a rectangular parallelepiped block member having a stepped portion, and is mounted as a greasing member with the width direction of the multistage telescopic boom 10 as the longitudinal direction. A nipple mounting surface 59 is formed by a step portion at one end in the longitudinal direction of the nipple mounting base 50 (the center side of the multi-stage telescopic boom 10). The nipple mounting surface 59 has a lower nipple mounting surface 59 corresponding to the height of the grease nipple 60 to be mounted.

ニップル取付面５９には、ニップル取付孔５１が自身の底面５８に対して垂直に貫通形成され、ニップル取付孔５１の内周面には、ニップル取付用の雌ねじが形成されている。グリスニップル６０は、ニップル取付台座５０の上面からニップル取付孔５１に装着される。ニップル取付面５９の面積は、グリスニップル６０を取り付ける上で、工具が干渉しない十分な広さを有する。また、ニップル取付面５９の面積は、グリス注入用グリスガンＧ（図４参照）の先端をグリスニップル６０のニップル先端６０ｓに圧入したときにも、グリスガン先端がニップル取付台座５０に干渉しないように設定されている。 A nipple mounting hole 51 is formed through the nipple mounting surface 59 perpendicularly to the bottom surface 58 of the nipple mounting surface 59, and a female thread for mounting the nipple is formed on the inner peripheral surface of the nipple mounting hole 51. The grease nipple 60 is mounted in the nipple mounting hole 51 from the upper surface of the nipple mounting base 50. The area of the nipple mounting surface 59 is wide enough that the tool does not interfere when the grease nipple 60 is mounted. The area of the nipple mounting surface 59 is set so that the tip of the grease gun does not interfere with the nipple mounting base 50 even when the tip of the grease gun G for grease injection (see FIG. 4) is press-fitted into the nipple tip 60s of the grease nipple 60. Has been.

ニップル取付孔５１の底面５８には、グリスニップル６０と、圧入したグリスを吐出させる第一および第二グリス吐出孔５５、５６とを連通させる横送り油路５２が設けられる。第一グリス吐出孔５５は、各給脂装置２０のニップル取付台座５０が取り付けられるブーム４，２自体の上面に貫通孔として形成されることにより給脂構造を構成している。第二グリス吐出孔５６は、グリスニップル６０が装着されている側とは反対側の、ニップル取付台座５０の肉厚部５４の下部に形成されており、第一および第二グリス吐出孔５５、５６の各々の中心軸ＣＬは同軸を形成している。 The bottom feed 58 of the nipple mounting hole 51 is provided with a lateral feed oil passage 52 for communicating the grease nipple 60 with the first and second grease discharge holes 55 and 56 for discharging the press-fit grease. The 1st grease discharge hole 55 comprises the greasing structure by being formed as a through-hole in the upper surface of boom 4 and 2 itself to which the nipple mounting base 50 of each greasing apparatus 20 is attached. The second grease discharge hole 56 is formed in the lower part of the thick portion 54 of the nipple mounting base 50 on the side opposite to the side on which the grease nipple 60 is mounted, and the first and second grease discharge holes 55, Each central axis CL of 56 forms a coaxial axis.

本実施形態の例では、ニップル取付台座５０の底面５８の横送り油路５２は、ニップル取付台座５０の中央に半円状の凹溝が長手方向（ブーム幅方向）全幅に渡って設けられている。本実施形態では、ブーム４，２の上面へのニップル取付台座５０の溶接の際に、ニップル取付台座５０の底面５８に形成された半円状の凹溝の両端が溶着時に融けて両端の開口部が塞がれる。これにより、当該給脂構造２０を設けるブームの上面と当該ニップル取付台座５０の底面との間に横送り油路５２が形成される。ニップル取付孔５１の中心軸と第一および第二グリス吐出孔５５、５６の中心軸ＣＬは、横送り油路５２の中心軸と直交するように、自身の底面５８に対して垂直に貫通形成される。なお、第二グリス吐出孔５６の上部は、上方に向かうにつれ拡径するフレア部５７となっている。 In the example of this embodiment, the lateral feed oil passage 52 on the bottom surface 58 of the nipple mounting base 50 is provided with a semicircular concave groove in the center of the nipple mounting base 50 over the entire length (boom width direction). Yes. In this embodiment, when welding the nipple mounting pedestal 50 to the upper surfaces of the booms 4 and 2, both ends of the semicircular concave grooves formed on the bottom surface 58 of the nipple mounting pedestal 50 melt at the time of welding, and the openings at both ends are opened. The part is blocked. Thus, a lateral feed oil passage 52 is formed between the upper surface of the boom on which the greasing structure 20 is provided and the bottom surface of the nipple mounting base 50. The central axis of the nipple mounting hole 51 and the central axis CL of the first and second grease discharge holes 55 and 56 are formed so as to penetrate perpendicularly to the bottom surface 58 so as to be orthogonal to the central axis of the lateral feed oil passage 52. Is done. In addition, the upper part of the 2nd grease discharge hole 56 becomes the flare part 57 which diameter expands as it goes upwards.

第一および第二グリス吐出孔５５、５６は、グリスニップル６０を取り付けたブーム４，２と当該ブーム４，２の１段内側のブーム５，３との間と、グリスニップル６０を取り付けたブーム４，２と当該ブーム４，２の１段外側のブーム３，１との間に、同時にグリスを給脂可能に位置している。これにより、各給脂装置２０のグリスニップル６０に給脂することによって、各給脂装置２０が取り付けられるブーム４，２の摺動板本体３２の摺動面３０ｓ、及びそのブーム４，２よりも一段内側の摺動板本体３２の摺動面３０ｓにグリスが付着するように第一および第二グリス吐出孔５５、５６を介して給脂されるようになっている。 The first and second grease discharge holes 55 and 56 are provided between the booms 4 and 2 to which the grease nipple 60 is attached and the booms 5 and 3 inside the first stage of the booms 4 and 2 and the boom to which the grease nipple 60 is attached. Between the booms 4 and 2 and the booms 3 and 1 outside the first stage of the booms 4 and 2, grease is simultaneously positioned. Thereby, by greasing the grease nipple 60 of each greasing device 20, the sliding surface 30s of the sliding plate body 32 of the booms 4, 2 to which each greasing device 20 is attached, and the booms 4, 2 thereof. In addition, the grease is supplied through the first and second grease discharge holes 55 and 56 so that the grease adheres to the sliding surface 30s of the sliding plate body 32 on the inner side of the first stage.

ニップル取付台座５０の、ブーム４，２上におけるブーム幅方向への取付位置は、横送り油路５２が、上下２箇所の摺動板３０がブーム伸縮時に通過する軌跡と交差する位置まで伸びる位置に設けられる。本実施形態では、第一および第二グリス吐出孔５５、５６の中心軸ＣＬが、給脂装置２０を設けるブームの肩の位置に当たる摺動板３０の中心と、ブーム長尺方向に重なる様に配置される。
ニップル取付台座５０のブーム４，２上における、ブーム長尺方向の取付位置は、ブーム最縮小時において、横断面視において、当該ブーム４，２の１段内側のブームの摺動板本体３２よりもわずかに前方（ブーム先端側）に第一グリス吐出孔５５および第二グリス吐出孔５６が位置するように配置される。 The mounting position of the nipple mounting base 50 in the boom width direction on the booms 4 and 2 is a position where the lateral feed oil passage 52 extends to a position where the upper and lower sliding plates 30 intersect with the trajectory that passes when the boom extends and contracts. Is provided. In the present embodiment, the center axis CL of the first and second grease discharge holes 55 and 56 overlaps with the center of the sliding plate 30 that corresponds to the shoulder position of the boom on which the greasing device 20 is provided, in the boom longitudinal direction. Be placed.
The mounting position of the nipple mounting pedestal 50 on the booms 4 and 2 in the boom length direction is from the sliding plate body 32 of the boom inside the first stage of the booms 4 and 2 in the cross sectional view when the boom is contracted to the minimum. Also, the first grease discharge hole 55 and the second grease discharge hole 56 are arranged slightly forward (boom tip side).

各給脂装置２０のグリスニップル６０に給脂されたグリスは、第一グリス吐出孔５５の出口では、当該ブーム４，２の１段内側のブーム５，３の摺動板取付台座４０と当該ブーム４，２のブーム内壁面との間の空間に溜まる。また、第二グリス吐出孔５６の出口では、当該ブーム４，２の１段外側のブーム３，１のブーム内壁面と第二グリス吐出孔５６の出口の上面との間の空間に溜まる。これにより、給脂されたグリスは、内外で隣接する二つの摺動板本体３２の前方のブーム内壁面に一旦付着し、その付着したグリスが各摺動板本体３２の摺動面３０ｓに付着することで間接的に各摺動板本体３２に給脂するようになっている。 The grease supplied to the grease nipple 60 of each grease supply device 20 is connected to the sliding plate mounting base 40 of the booms 5 and 3 inside the first stage of the booms 4 and 2 at the outlet of the first grease discharge hole 55. It collects in the space between the boom inner wall surfaces of the booms 4 and 2. Further, at the outlet of the second grease discharge hole 56, it collects in a space between the boom inner wall surface of the booms 3, 1 outside the first stage of the booms 4, 2 and the upper surface of the outlet of the second grease discharge hole 56. As a result, the grease that has been lubricated temporarily adheres to the inner wall surface of the boom in front of the two adjacent sliding plate bodies 32 inside and outside, and the adhered grease adheres to the sliding surface 30s of each sliding plate body 32. By doing so, each sliding plate main body 32 is greased indirectly.

ここで、この給脂装置２０における、上下の摺動板３０に対する２ヶ所同時給脂時のグリス供給量の均一化構造について説明する。
この給脂装置２０は、上下の摺動板３０に対するグリス供給量を均一化すべく、グリスニップル６０から給脂されるグリス供給量が、ニップル取付台座５０の下部の第一グリス吐出孔５５と上部の第二グリス吐出孔５６とで同量が上下に給脂されるように、下記のグリス供給量の均一化構造を設けている。 Here, the structure for equalizing the grease supply amount at the time of simultaneous lubrication at two places on the upper and lower sliding plates 30 in the greasing device 20 will be described.
The grease supply device 20 is configured so that the grease supply amount supplied from the grease nipple 60 is equal to the upper portion of the first grease discharge hole 55 and the upper portion of the nipple mounting base 50 in order to uniformize the grease supply amount to the upper and lower sliding plates 30. The following grease supply amount equalizing structure is provided so that the same amount of oil is fed up and down with the second grease discharge hole 56.

（第一条件：各吐出孔の直径）
第一に、上下のグリス吐出孔５５、５６は、第一グリス吐出孔５５と第二グリス吐出孔５６の開口径を同径としている。具体的には、下側開口となる第一グリス吐出孔５５、つまり、ブーム２、４の貫通穴の直径は、第二グリス吐出孔５６の直径と同径（直径φＣ）である。なお、半円を形成する横送り油路５２の形状を、ニップル取付台座５０の側面を貫通する「円形」の横穴から形成する場合であれば、その円形の横穴に直交する、第一グリス吐出孔の開口までの竪穴通路を含めた、ブーム２，４の貫通穴までの径を同径（直径φＣ）にする。 (First condition: Diameter of each discharge hole)
First, the upper and lower grease discharge holes 55 and 56 have the same diameter as the first grease discharge hole 55 and the second grease discharge hole 56. Specifically, the diameter of the first grease discharge hole 55 serving as the lower opening, that is, the through hole of the booms 2 and 4 is the same as the diameter of the second grease discharge hole 56 (diameter φC). If the shape of the lateral feed oil passage 52 forming the semicircle is formed from a “circular” lateral hole penetrating the side surface of the nipple mounting base 50, the first grease discharge orthogonal to the circular lateral hole is provided. The diameter to the through hole of the booms 2 and 4 including the pothole passage to the opening of the hole is made the same diameter (diameter φC).

（第二条件：各吐出孔の長さ）
第二に、上下のグリス吐出孔５５、５６の管路長さを同じ長さにしている。つまり、図２において、ニップル取付台座５０の第二グリス吐出孔５６の長さＡを、ニップル取付台座５０を設けたブームの板厚Ｂと同じ長さにしている。但し、ニップル取付台座５０のグリス吐出孔５５、５６の長さとは、フレア部５７および横送り油路５２の凹溝の高さを除いた円形竪穴部分の長さである。これにより、上下のグリス吐出孔５５、５６とも、流路面積及び流路長さが等しくなるので、上下の摺動板本体３２に給脂されるグリスの吐出圧がほぼ等しくなる。 (Second condition: length of each discharge hole)
Second, the pipe lengths of the upper and lower grease discharge holes 55 and 56 are the same. That is, in FIG. 2, the length A of the second grease discharge hole 56 of the nipple mounting base 50 is the same as the thickness B of the boom provided with the nipple mounting base 50. However, the lengths of the grease discharge holes 55 and 56 of the nipple mounting base 50 are the lengths of the circular hole portions excluding the height of the flare portion 57 and the concave groove of the lateral feed oil passage 52. As a result, the upper and lower grease discharge holes 55 and 56 have the same flow path area and flow path length, so that the discharge pressures of grease supplied to the upper and lower sliding plate bodies 32 are substantially equal.

（第三条件：複数の吐出孔の合計流路断面積）
第三に、この給脂装置２０では、グリス吐出量を安定して上下の摺動板３０に分配供給するために、ニップル取付台座５０の第二グリス吐出孔５６およびブーム２，４の貫通穴からなる第一グリス吐出孔５５を、その流路断面積（φＣの孔径）を可及的に小径としている。この構成により、小径の吐出流路からグリスが押し出されるので、上下のグリス吐出孔５５、５６を小径とすることによって生じる抵抗により吐出圧が高くなる。
なお、一般的に、多段伸縮ブーム用のグリスには、リチウム石鹸グリスが使用されることから、その流路断面積（φＣの孔径）は、グリス中のゴミによる詰まり、古いグリスの硬化による詰まり防止とのバランスを考慮し、直径φ４ｍｍ〜φ８ｍｍ相当がよい。また、給脂されるグリスの塗布面積を広く設けたい場合は、上下のグリス吐出孔５５、５６を幅方向の複数箇所に離隔して設ければよい。 (Third condition: total flow area of multiple discharge holes)
Third, in this greasing device 20, in order to stably distribute and supply the grease discharge amount to the upper and lower sliding plates 30, the second grease discharge hole 56 of the nipple mounting base 50 and the through holes of the booms 2 and 4 are used. The first grease discharge hole 55 is made to have a channel cross-sectional area (hole diameter of φC) as small as possible. With this configuration, the grease is pushed out from the small-diameter discharge flow path, so that the discharge pressure increases due to the resistance generated by making the upper and lower grease discharge holes 55 and 56 have a small diameter.
In general, lithium soap grease is used for grease for multi-stage telescopic booms. Therefore, the cross-sectional area of the flow path (φC hole diameter) is clogged with dust in the grease and clogged due to hardening of old grease. Considering the balance with prevention, a diameter of φ4 mm to φ8 mm is preferable. In addition, when it is desired to provide a large area for applying grease to be greased, the upper and lower grease discharge holes 55 and 56 may be provided separately at a plurality of locations in the width direction.

（第四条件：上下の吐出孔の先の空間部の対向距離）
第四に、この給脂装置２０では、上下のグリス吐出孔５５、５６から吐出されたグリスが、その先の空間部の影響の差異を受け難いように各部の配置を決定している。ここで、「その先の空間部」とは、本実施形態では、上下のグリス吐出孔５５、５６の出口から、各グリス吐出孔５５、５６の出口に対向する摺動板取付台座４０の上面またはブーム内壁面までの対向距離をいう。上下のグリス吐出孔５５、５６の「その先の空間部」にて、上記対向距離の差が大きいと、対向距離の短い方がグリス吐出に際して抵抗となり、グリス吐出量が少なくなってしまうためである。本実施形態では、グリス吐出孔５５、５６の出口から摺動板取付台座４０の上面までの対向距離とブーム内壁面までの対向距離を上下で等距離にしている。 (Fourth condition: the facing distance of the space part at the top of the upper and lower discharge holes)
Fourthly, in this greasing apparatus 20, the arrangement of each part is determined so that the grease discharged from the upper and lower grease discharge holes 55 and 56 is not easily affected by the influence of the space part ahead. Here, in the present embodiment, the “space portion ahead” refers to the upper surface of the sliding plate mounting base 40 facing the outlets of the grease discharge holes 55 and 56 from the outlets of the upper and lower grease discharge holes 55 and 56. Or it means the facing distance to the inner wall surface of the boom. If the difference between the opposing distances is large at the “space portion ahead” of the upper and lower grease discharge holes 55 and 56, the shorter facing distance becomes resistance when grease is discharged, and the amount of grease discharged is reduced. is there. In the present embodiment, the facing distance from the outlet of the grease discharge holes 55 and 56 to the upper surface of the sliding plate mounting base 40 and the facing distance to the inner wall surface of the boom are equal to each other in the vertical direction.

すなわち、図２において、同図右下の給脂装置２０の場合、当該給脂装置２０の第一グリス吐出孔５５（ブーム４の貫通穴）の出口となるブーム４の内壁面と、そのブーム４の内壁面に対向する、内側のブーム５の摺動板取付台座４０の上面までの対向距離Ｄと、当該給脂装置２０の第二グリス吐出孔５６のフレア部５７上面とその上部に対向するブーム３の内壁面との対向距離Ｅを等距離（Ｄ＝Ｅ）にしている。上記対向距離Ｄ、対向距離Ｅともに、対向距離が狭い方が、吐出されたグリスが水平方向に放射状かつ均一に広がる。したがって、摺動板取付台座４０の上面の高さは、吐出されるグリスの広がりに必要な対向距離（Ｅ）に基づいて決定される。 That is, in the case of the greasing device 20 at the lower right in FIG. 2, the inner wall surface of the boom 4 serving as the outlet of the first grease discharge hole 55 (the through hole of the boom 4) of the greasing device 20, and the boom 4 facing the inner wall surface of the inner boom 5, facing the upper surface of the sliding plate mounting base 40 of the inner boom 5, facing the upper surface of the flare 57 of the second grease discharge hole 56 of the greasing device 20 and the upper part thereof. The facing distance E from the inner wall surface of the boom 3 is equal distance (D = E). When both the facing distance D and the facing distance E are shorter, the discharged grease spreads radially and uniformly in the horizontal direction. Accordingly, the height of the upper surface of the sliding plate mounting base 40 is determined based on the facing distance (E) required for spreading of the discharged grease.

なお、ニップル取付台座５０の第二グリス吐出孔５６の流路長さＡの設定は、ブーム材の板厚寸法Ｂを変更することは容易でないことから、ニップル取付台座５０側の第二グリス吐出孔５６の流路長さＡをブーム材の板厚寸法Ｂ（つまり、第一グリス吐出孔５５の流路長さ）と等しくし、さらに、第二グリス吐出孔５６の上部に広がるフレア部５７を設けることで第二グリス吐出孔５６の管路抵抗を低減して、上下のグリス吐出孔５５、５６からのグリス供給量の均一化構造の上記第一から第四の条件を満たすようにしている。 Note that setting the flow path length A of the second grease discharge hole 56 of the nipple mounting base 50 is not easy to change the plate thickness dimension B of the boom material, so the second grease discharge on the nipple mounting base 50 side is not easy. The flow path length A of the hole 56 is made equal to the plate thickness dimension B of the boom material (that is, the flow path length of the first grease discharge hole 55), and further, the flare portion 57 spreads over the second grease discharge hole 56. By reducing the pipe line resistance of the second grease discharge hole 56, the above first to fourth conditions of the structure for uniformizing the amount of grease supplied from the upper and lower grease discharge holes 55, 56 are satisfied. Yes.

次に、上記給脂装置２０への給脂およびグリスの充填方法、および上記給脂装置２０の作用・効果について説明する。
上記給脂装置２０に給脂する際は、作業者は、図４に示すように、まず、多段伸縮ブーム１０を全縮小した状態のときに、多段伸縮ブーム１０内部の各給脂装置２０のグリスニップル６０にグリスガンＧを差し込み、ニップル取付台座５０の横送り油路５２を介して上下のグリス吐出孔５５、５６に給脂する。なお、給脂を行わないときには、最外部の基端ブーム１のグリス給脂用の貫通孔７０Ｃに、エラストマ等の弾性体で形成された蓋６２で埋栓をしておくとよい。 Next, a method of filling the grease with the grease 20 and filling the grease, and an operation / effect of the grease device 20 will be described.
When the greasing apparatus 20 is lubricated, as shown in FIG. 4, first, when the multistage telescopic boom 10 is fully contracted, the operator first sets the greasing apparatus 20 inside the multistage telescopic boom 10. A grease gun G is inserted into the grease nipple 60, and grease is supplied to the upper and lower grease discharge holes 55 and 56 via the lateral feed oil passage 52 of the nipple mounting base 50. In addition, when not greasing, it is advisable to plug the grease through-hole 70C of the outermost base end boom 1 with a lid 62 formed of an elastic body such as an elastomer.

グリスガンＧから射出されたグリスは、各給脂装置２０のグリスニップル６０からニップル取付台座５０の横送り油路５２を通って上下のグリス吐出孔５５、５６に流入する。
下部の第一グリス吐出孔５５に流入したグリスは、当該給脂装置２０が装着されたブーム２，４のブーム内壁面と当該給脂装置２０を取り付けたブーム２，４の１段内側のブーム３，５に設けられた摺動板３０の前方上面との間の空間に溜まる（第一グリス溜まり部）。また、上部の第二グリス吐出孔５６に流入したグリスは、当該給脂装置２０を取り付けたブームの１段外側のブーム１，３のブーム内壁面と第二グリス吐出孔５６の出口の上面との間の空間に溜まる（第二グリス溜まり部）。 The grease injected from the grease gun G flows into the upper and lower grease discharge holes 55 and 56 from the grease nipple 60 of each greasing device 20 through the lateral feed oil passage 52 of the nipple mounting base 50.
The grease that has flowed into the lower first grease discharge hole 55 is the boom inner wall surface of the booms 2 and 4 to which the grease supplying device 20 is attached and the boom inside the first stage of the booms 2 and 4 to which the grease supplying device 20 is attached. It collects in the space between the front upper surface of the sliding plate 30 provided in 3 and 5 (first grease reservoir part). Further, the grease that has flowed into the upper second grease discharge hole 56 includes the boom inner wall surface of the booms 1 and 3 outside the first stage of the boom to which the greasing device 20 is attached, and the upper surface of the outlet of the second grease discharge hole 56. It collects in the space between (second grease reservoir).

上下のグリス吐出孔５５、５６は、摺動板３０がブーム伸縮時に通過する軌道上に向き合う位置に開口しているので、第一および第二グリス溜まり部に付着したグリスは、多段伸縮ブーム１０を何度か伸縮させることで、各摺動板本体３２の摺動面３０ｓに付着させることができる。なお、第一および第二グリス溜まり部にグリスが過剰に供給された場合、グリスは、第一および第二グリス溜まり部から溢れてブーム内壁面側方に流れ出す。古いグリスも同様にブーム内壁面側方に流れ出す。そのため、供給したグリスによって第一および第二グリス溜まり部の空間に圧が籠ることはない。
このように、上記給脂装置２０によれば、１つのグリスニップル６０から給脂したグリスは、グリスニップル６０が装着されるニップル取付孔５１と、ニップル取付孔５１に連通する横送り油路５２から、複数の分岐油路である上下のグリス吐出孔５５、５６を介して、均一なグリス量を上下の摺動板３０に対して供給することを可能にしている。 Since the upper and lower grease discharge holes 55 and 56 are opened at positions facing the trajectory through which the sliding plate 30 passes when the boom is extended and contracted, the grease adhering to the first and second grease reservoirs is removed from the multistage extendable boom 10. Can be attached to the sliding surface 30s of each sliding plate main body 32 by expanding and contracting several times. When excessive grease is supplied to the first and second grease reservoirs, the grease overflows from the first and second grease reservoirs and flows out to the side of the boom inner wall surface. The old grease also flows to the side of the boom inner wall. Therefore, no pressure is applied to the space of the first and second grease reservoirs by the supplied grease.
As described above, according to the greasing device 20, the grease fed from one grease nipple 60 is connected to the nipple mounting hole 51 in which the grease nipple 60 is mounted, and the lateral feed oil passage 52 communicating with the nipple mounting hole 51. Therefore, it is possible to supply a uniform amount of grease to the upper and lower sliding plates 30 via the upper and lower grease discharge holes 55 and 56 that are a plurality of branch oil passages.

そして、複数の分岐油路である上下のグリス吐出孔５５、５６は、給脂装置２０を取り付けたブーム２，４と当該ブーム２，４の１段内側のブーム３，５との間と、給脂装置２０を取り付けたブーム２，４と当該ブーム２，４の１段外側のブーム１，３との間に、同時にグリスを給脂するように横送り油路５２に連通して設けられているので、給脂装置２０に取り付けられた１箇所のグリスニップル６０から内外の複数のブーム２段分の２箇所の摺動板２０に同時に給脂をすることができる。したがって、この給脂装置２０によれば、内外のブーム摺動板３０同士が重なり合わなくとも、多段伸縮ブーム１０のグリスニップル６０の取り付け箇所を減らすことができ、また、作業用穴であるグリス給脂用の貫通孔７０Ａ、Ｂ、Ｃも減らすことができる。 And the upper and lower grease discharge holes 55 and 56 which are a plurality of branch oil passages are between the booms 2 and 4 to which the greasing device 20 is attached and the booms 3 and 5 inside the first stage of the booms 2 and 4. Between the booms 2 and 4 to which the greasing device 20 is attached and the booms 1 and 3 outside the first stage of the booms 2 and 4 are provided in communication with the lateral feed oil passage 52 so as to grease simultaneously. Therefore, the grease can be simultaneously supplied from the grease nipple 60 attached to the grease supply device 20 to the two sliding plates 20 corresponding to the two stages of the inner and outer booms. Therefore, according to this greasing device 20, even if the inner and outer boom sliding plates 30 do not overlap each other, it is possible to reduce the number of locations where the grease nipple 60 of the multistage telescopic boom 10 is attached, and the grease which is a working hole. The through holes 70A, B, and C for greasing can also be reduced.

なお、本発明に係る給脂装置は、上記第一実施形態に限定されるものではなく、本発明の趣旨を逸脱しなければ種々の変形が可能なことは勿論である。
例えば、上記第一実施形態では、ニップル取付台座５０は、多段伸縮ブーム１０の幅方向を長手方向とする装着例で説明したが、これに限定されず、ニップル取付台座５０は、横送り油路５２がニップル取付孔５１に連通するとともに２箇所の摺動板３０がブーム伸縮時に通過する位置に対して複数のブームの内外方向で対面する位置まで、または、２箇所の摺動板３０がブーム伸縮時に通過する軌跡に沿って設けられていれば種々の装着姿勢を採用できる。つまり、横送り油路５２の「横送り」の向きとは、多段伸縮ブーム１０の幅方向と伸縮方向とを含む平面に沿った方向であればよく、例えば、横送り油路５２の延在方向を多段伸縮ブーム１０の伸縮方向に沿って設けることができる。図５および図６にこのような第二実施形態を示す。 In addition, the greasing apparatus which concerns on this invention is not limited to said 1st embodiment, Of course, a various deformation | transformation is possible if it does not deviate from the meaning of this invention.
For example, in the first embodiment, the nipple mounting pedestal 50 has been described in the mounting example in which the width direction of the multistage telescopic boom 10 is the longitudinal direction. However, the nipple mounting pedestal 50 is not limited to this, and the lateral feed oil passage is not limited thereto. 52 is in communication with the nipple mounting hole 51 and the two sliding plates 30 are in the inner and outer directions of the plurality of booms with respect to the position where the two sliding plates 30 pass when the boom is extended or contracted. Various mounting postures can be adopted as long as they are provided along a trajectory that passes during expansion and contraction. That is, the direction of “lateral feed” of the lateral feed oil passage 52 may be a direction along a plane including the width direction and the extension / contraction direction of the multistage telescopic boom 10, for example, the extension of the lateral feed oil passage 52. The direction can be provided along the expansion / contraction direction of the multistage telescopic boom 10. FIG. 5 and FIG. 6 show such a second embodiment.

図５および図６に示すように、この第二実施形態では、上記第一実施形態に対し、ニップル取付台座５０が多段伸縮ブーム１０の伸縮方向を自身長手方向として装着されている点が異なっている。すなわち、第二実施形態では、ニップル取付台座５０は、ニップル取付台座５０が多段伸縮ブーム１０の伸縮方向を自身の長手方向とし、多段伸縮ブーム１０の先端側にニップル取付面５９が位置する姿勢で装着されている。また、図５に示す多段伸縮ブームの横断面視において、ニップル取付孔５１の中心軸の位置は、内外の摺動板３０の幅方向中央に位置するように固定されている。これにより、この第二実施形態では、ニップル取付台座５０の底面の横送り油路は、ブーム伸縮方向に沿って設けられる。 As shown in FIGS. 5 and 6, the second embodiment differs from the first embodiment in that the nipple mounting base 50 is mounted with the expansion / contraction direction of the multistage telescopic boom 10 as the longitudinal direction. Yes. That is, in the second embodiment, the nipple mounting pedestal 50 has a posture in which the nipple mounting pedestal 50 has the expansion / contraction direction of the multistage telescopic boom 10 as its longitudinal direction, and the nipple mounting surface 59 is located on the tip side of the multistage telescopic boom 10. It is installed. Further, in the cross-sectional view of the multistage telescopic boom shown in FIG. 5, the position of the central axis of the nipple mounting hole 51 is fixed so as to be positioned at the center in the width direction of the inner and outer sliding plates 30. Thereby, in this 2nd embodiment, the lateral feed oil path of the bottom face of the nipple mounting base 50 is provided along a boom expansion-contraction direction.

このような構成であっても、横送り油路５２が、２箇所の摺動板３０がブーム伸縮時に通過する軌跡に沿って伸びており、上下のグリス吐出孔５５、５６は、摺動板３０がブーム伸縮時に通過する軌道上に向き合う位置に開口しているので、図６に示すように、グリスガンＧから射出されたグリスは、各給脂装置２０のグリスニップル６０からニップル取付台座５０の横送り油路５２を通り、上下のグリス吐出孔５５、５６から、当該給脂装置２０が装着されたブーム２，４のブーム内壁面と当該給脂装置２０を取り付けたブーム２，４の１段内側のブーム３，５に設けられた摺動板３０の前方上面との間の空間（第一グリス溜まり部）と、当該給脂装置２０を取り付けたブームの１段外側のブーム１，３のブーム内壁面と第二グリス吐出孔５６の出口の上面との間の空間（第二グリス溜まり部）とに溜まる。そのため、内外のブーム摺動板同士が重なり合わなくとも内外の摺動板３０に給脂をすることができ、グリスニップル６０の取り付け箇所を減らすことができ、また、作業用穴７０Ａ、Ｂ、Ｃも減らすことができる。 Even in such a configuration, the lateral feed oil passage 52 extends along a trajectory through which the two sliding plates 30 pass when the boom extends and contracts, and the upper and lower grease discharge holes 55 and 56 are formed by the sliding plates. Since 30 is opened at a position facing the trajectory that passes when the boom extends and contracts, as shown in FIG. 6, the grease injected from the grease gun G is supplied from the grease nipple 60 of each greasing device 20 to the nipple mounting base 50. The boom inner wall surface of the booms 2 and 4 to which the greasing device 20 is attached and the booms 2 and 1 to which the greasing device 20 is attached are passed through the lateral feed oil passage 52 through the upper and lower grease discharge holes 55 and 56. Booms 1 and 3 on the outer side of the first stage of the boom to which the greasing device 20 is attached and the space between the front upper surface of the sliding plate 30 provided on the inner booms 3 and 5 (first grease reservoir). Boom inner wall and second grease discharge hole It collects in the space between the 6 upper surface of the outlet of the (second grease reservoir). Therefore, even if the inner and outer boom sliding plates do not overlap with each other, the inner and outer sliding plates 30 can be lubricated, the number of mounting locations of the grease nipple 60 can be reduced, and the working holes 70A, B, C can also be reduced.

１基端ブーム（ブーム）
２第１中間ブーム（ブーム）
３第２中間ブーム（ブーム）
４第３中間ブーム（ブーム）
５先端ブーム（ブーム）
６コラム
７ウインチ
８ワイヤロープ
９フック
１０多段伸縮ブーム
２０給脂装置
３０摺動板
３０ｓ摺動面
３２摺動板本体
４０摺動板取付台座
５０ニップル取付台座
５１ニップル取付孔
５２横送り油路
５４肉厚部
５５第一グリス吐出孔（分岐油路、貫通孔）
５６第二グリス吐出孔（分岐油路）
５７フレア部
５８底面
５９ニップル取付面
６０グリスニップル
６２蓋
７０Ａ、Ｂ、Ｃグリス給脂用の貫通孔（作業用穴） 1 Base end boom (boom)
2 First intermediate boom (boom)
3 Second intermediate boom (boom)
4 Third intermediate boom (boom)
5 Tip boom (boom)
6 Column 7 Winch 8 Wire rope 9 Hook 10 Multi-stage telescopic boom 20 Greasing device 30 Sliding plate 30s Sliding surface 32 Sliding plate body 40 Sliding plate mounting base 50 Nipple mounting base 51 Nipple mounting hole 52 Side feed oil passage 54 Thick part 55 First grease discharge hole (branch oil passage, through hole)
56 Second grease discharge hole (branch oil passage)
57 Flare portion 58 Bottom surface 59 Nipple mounting surface 60 Grease nipple 62 Lid 70A, B, C Grease greasing through hole (working hole)

Claims

A greasing apparatus for use in a multistage telescopic boom having a plurality of booms that are slidably inserted sequentially from the base end side to the tip end side, and a sliding plate provided between adjacent booms among the plurality of booms. Because
A grease supply structure for dividing the grease supplied from one grease nipple and supplying grease to the two sliding plates of the boom adjacent inside and outside,
The greasing structure is
A nipple mounting hole in which the grease nipple is mounted;
Apply grease between the boom on which the sliding plate on the inner side of the boom on which the grease supply structure is provided faces the track that passes when the boom expands and contracts, and the boom on the inner side of the first stage. A first grease discharge hole for lubricating,
Second, grease is applied between the boom on which the sliding plate of the boom provided with the greasing structure faces a trajectory that passes when the boom extends and contracts and the boom on which the grease supplying structure is provided and the boom outside the first stage. Grease discharge hole,
A grease supply device for a multi-stage telescopic boom, characterized by having a lateral feed oil passage for communicating the first grease discharge hole and the second grease discharge hole with the nipple mounting hole.

2. The grease supply device for a multistage telescopic boom according to claim 1, wherein the first grease discharge hole and the second grease discharge hole have the same flow path cross-sectional area and flow path length.

3. The grease supply device for a multistage telescopic boom according to claim 1, wherein the first grease discharge hole is a through hole formed in a boom itself provided with the grease supply structure.

The outlet of the first grease discharge hole is a space between a boom inner wall surface of the boom provided with the grease supplying structure and a front upper surface of a sliding plate provided on a boom inside the first stage of the boom provided with the grease supplying structure. It is the first grease reservoir where grease accumulates,
The outlet of the second grease discharge hole is a second grease in which grease accumulates in a space between the boom inner wall surface of the boom outside the first stage of the boom provided with the greasing structure and the upper surface of the outlet of the second grease discharge hole. The greasing device for a multistage telescopic boom according to any one of claims 1 to 3, wherein the greasing device is a reservoir.

The greasing structure has a nipple mounting base welded to an upper surface of a boom on which the greasing structure is provided. The nipple mounting base has the nipple mounting hole formed on the upper surface side, and the nipple mounting base. A concave groove is formed which communicates with the hole and is provided over the entire bottom surface of the nipple mounting base.
The lateral feed oil passage is closed by welding to the upper surface of the boom on which the greasing structure is provided at the openings at both ends of the concave groove, and the bottom surface of the nipple mounting pedestal on the nipple mounting base. The grease supply apparatus for multistage telescopic booms as described in any one of Claims 1-4 formed between these.

A multistage telescopic boom comprising the grease supply device for a multistage telescopic boom according to any one of claims 1 to 5.