JPH0198701A - Protection device for hydraulic cylinder - Google Patents
Protection device for hydraulic cylinderInfo
- Publication number
- JPH0198701A JPH0198701A JP25154187A JP25154187A JPH0198701A JP H0198701 A JPH0198701 A JP H0198701A JP 25154187 A JP25154187 A JP 25154187A JP 25154187 A JP25154187 A JP 25154187A JP H0198701 A JPH0198701 A JP H0198701A
- Authority
- JP
- Japan
- Prior art keywords
- rod
- cover
- hydraulic cylinder
- holder
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009412 basement excavation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2271—Actuators and supports therefor and protection therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Component Parts Of Construction Machinery (AREA)
- Actuator (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は油圧ショベルのフロントに備えられる油圧シリ
ンダ等の液圧シリンダの保護装置に係り、特に当該液圧
シリンダのロッドを良好に保護しうる保護装置に関する
。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a protection device for a hydraulic cylinder such as a hydraulic cylinder provided at the front of a hydraulic excavator, and in particular is capable of effectively protecting the rod of the hydraulic cylinder. Regarding protective devices.
〈従来の技術〉
第７図は液圧シリンダの一例としての油圧シリンダが具
備される油圧ショベルを示す側面図である。この油圧シ
ョベルは、本体に装着されるフロントとして、ブーム１
、アーム２、パケット３、ブーム１を駆動するブームシ
リンダ４、アームＥ。<Prior Art> FIG. 7 is a side view showing a hydraulic excavator equipped with a hydraulic cylinder as an example of a hydraulic cylinder. This hydraulic excavator has a boom 1 as the front mounted on the main body.
, arm 2, packet 3, boom cylinder 4 that drives boom 1, and arm E.
リング５、パケットシリンダ６等を備えており、特にブ
ームシリンダ４、アームシリンダ５、パケットシリンダ
６は油圧シリンダから成っている。It includes a ring 5, a packet cylinder 6, etc., and in particular, the boom cylinder 4, arm cylinder 5, and packet cylinder 6 are hydraulic cylinders.
そして、これらの油圧シリンダ例えばパケットシリンダ
６は、円筒状を形成するチューブ７と、このチューブ７
内に収納可能なピストンが装着されるロッド８とを備え
ており、当該パケットシリンダ６の端部９．１０のそれ
ぞれは、偏心荷重を受けるため、第８図に例示する球面
軸受１１を備えている。These hydraulic cylinders, for example, the packet cylinder 6, include a tube 7 forming a cylindrical shape, and this tube 7.
Each of the ends 9,10 of the packet cylinder 6 is provided with a spherical bearing 11, as illustrated in FIG. 8, for receiving eccentric loads. There is.
このような油圧ショベルにあっては、第７図の二点鎖線
で描いた掘削軌跡１２で示すように、掘削時にはパケッ
トシリンダ６を伸ばしてパケット３を巻込み、例えば接
地面１３の下側の土砂を掘削する。このとき、運転席１
５からパケットシリンダ６のロッド８は見えず、そのた
め、当該掘削中にロッド８が掘削部分の周囲にある岩石
に当なつ損傷し、このパケットシリンダ６を駆動する作
動油が外部に流出することがある。In such a hydraulic excavator, during excavation, the packet cylinder 6 is extended to reel in the packet 3, as shown by the excavation trajectory 12 drawn by the two-dot chain line in FIG. Excavate earth and sand. At this time, driver seat 1
5, the rod 8 of the packet cylinder 6 is not visible, and therefore, during the excavation, the rod 8 may hit rocks around the excavated area and be damaged, and the hydraulic oil that drives the packet cylinder 6 may leak outside. be.
〈発明が解決しようとする問題点〉
このようなことから、パケットシリンダ６のロッド８等
を保護する保護装置が要望されているが上記した油圧シ
ョベルにあっては、偏心荷重を受けるために球面軸受１
１を備えていることから、例えばパケットシリンダ６の
チューブ７とロッド８との間に相対的回動を生じ、この
ため当該保護装置の取付は等に問題があり、今まで望ま
しい保護装置は提案されていない。<Problems to be Solved by the Invention> For these reasons, there is a demand for a protection device that protects the rod 8 of the packet cylinder 6, etc. However, in the above-mentioned hydraulic excavator, a spherical surface is required to receive the eccentric load. Bearing 1
1, for example, a relative rotation occurs between the tube 7 and the rod 8 of the packet cylinder 6, which causes problems in the installation of the protection device, and so far no desirable protection device has been proposed. It has not been.
本発明は、上記した従来技術における実情に鑑みてなさ
れたもので、その目的は、液圧シリンダに対する着脱が
容易でロッドの損傷を確実に防止することができ、球面
軸受に接続されるものにも適用可能な液圧シリンダの保
護装置を提供することにある。The present invention was made in view of the above-mentioned actual situation in the prior art, and its purpose is to provide a hydraulic cylinder that can be easily attached and detached from a hydraulic cylinder, that can reliably prevent damage to the rod, and that is connected to a spherical bearing. Another object of the present invention is to provide a protection device for hydraulic cylinders which is also applicable.
く問題点を解決するための手段〉
この目的を達成するなめに本発明は、油圧シリンダ等の
液圧シリンダのロッドに固定されるホルダと、前述のロ
ッドを被覆可能なカバーと、このカバーとホルダとを相
対的回動可能に係合させる第１の係合手段と、カバーと
油圧シリンダのチューブとを相対的摺動自在に係合させ
る第２の係合手段とを備えた構成にしである。Means for Solving the Problems In order to achieve this object, the present invention provides a holder fixed to a rod of a hydraulic cylinder such as a hydraulic cylinder, a cover that can cover the rod, and a cover that can cover the rod. The first engaging means engages the holder in a relatively rotatable manner, and the second engaging means engages the cover and the tube of the hydraulic cylinder in a relatively slidable manner. be.
く作用〉
本発明は、上記のように構成しであることから、第１の
係合手段および第２の係合手段を介してカバーをロッド
に固定されるホルダに容易に着脱させることができ、カ
バーによってロッドの損傷を確実に防止することができ
るとともに、第１の係合手段においてカバーとロッドに
固定されるホルダとが相対的回動可能になっていること
から、球面軸受で接続されるもの、すなわちロッドとチ
ューブとの間に相対的回動を生じうるちのであっても適
用可能である。Effect> Since the present invention is configured as described above, the cover can be easily attached to and detached from the holder fixed to the rod via the first engagement means and the second engagement means. , the cover can reliably prevent damage to the rod, and the cover and the holder fixed to the rod can be rotated relative to each other in the first engagement means, so that they are connected by a spherical bearing. The present invention is also applicable to those in which relative rotation occurs between the rod and the tube.
〈実施例〉
以下、本発明の液圧シリンダの保護装置を図に基づいて
説明する。第１図〜第６図は本発明の一実施例を油圧シ
リンダに適用した場合を示す説明図で、第１図は油圧シ
リンダの伸長時を示す断面部分を含む側面図、第２図は
油圧シリンダの収縮時を示す断面部分を含む側面図、第
３図は第１図のＡ矢視に相応す乞拡大断面図、第４図は
第１図のＢ部拡大図、第５図は第４図のＣ矢視に相応す
る断面図、第６図は第４図のＤ矢視に相応する断面図で
ある。<Example> Hereinafter, a protection device for a hydraulic cylinder according to the present invention will be explained based on the drawings. Figures 1 to 6 are explanatory diagrams showing a case where an embodiment of the present invention is applied to a hydraulic cylinder, in which Figure 1 is a side view including a cross section showing the hydraulic cylinder when it is extended, and Figure 2 is a hydraulic cylinder. 3 is an enlarged sectional view corresponding to arrow A in FIG. 1, FIG. 4 is an enlarged view of section B in FIG. 1, and FIG. 4, and FIG. 6 is a cross-sectional view corresponding to the direction of arrow D in FIG. 4.
これらの図、特に第１．２図に示す油圧シリンダは、例
えば油圧ショベルに備えられるパケットシリンダ２０で
、円筒状のチューブ２１と、このチューブ２１に収納可
能なピストンが装着されるロッド２２とを有している。The hydraulic cylinder shown in these figures, especially in Fig. 1.2, is a packet cylinder 20 installed in a hydraulic excavator, for example, and includes a cylindrical tube 21 and a rod 22 to which a piston that can be housed is attached. have.
チューブ２１の周側部には、第１．２．３図に示すよう
に、一対のレール２３．２４を設けてあり、ロッド２２
のチューブ２１から離れる側に位置する端部にはホルダ
２５を固定しである。As shown in FIG. 1.2.3, a pair of rails 23 and 24 are provided on the circumferential side of the tube 21, and the rod 22
A holder 25 is fixed to the end located on the side away from the tube 21.
このホルダ２５は第６図に示すように円筒体を２分割し
て形成される半割体２６．２７と、半割体２６に形成さ
れたねし穴２８に螺合し、半割体２７を一体に締結する
ボルト２９からなるとともに、第４図に示すように、そ
の中央部分に溝３０を有している。３１はロッド２２の
全長にわたってこのロッド２２を被覆するカバーで、チ
ューブ２１側に、当該チューブ２１の外径よりも十分に
大きな開口３１ａを有し、上述したホルダ２５に対応す
る位置に、第５図に示すように当該ホルダ２５の溝３０
に係合し、基本形状が半円形状からなるサポート３２を
有し、レール２３．２４に対応する位置に、第３図に示
すように当該レール２３．２４に相対的摺動可能に係合
する断面コ字状のガイド３３．３４を有している。As shown in FIG. 6, this holder 25 has half bodies 26 and 27 formed by dividing the cylindrical body into two, and is screwed into a threaded hole 28 formed in the half body 26. It consists of a bolt 29 that is fastened together, and has a groove 30 in its center, as shown in FIG. Reference numeral 31 denotes a cover that covers the entire length of the rod 22, and has an opening 31a on the tube 21 side that is sufficiently larger than the outer diameter of the tube 21, and a fifth cover at a position corresponding to the holder 25 described above. As shown in the figure, the groove 30 of the holder 25
It has a support 32 whose basic shape is a semicircular shape, and is engaged with the rail 23.24 in a position corresponding to the rail 23.24 so as to be able to slide relative to the rail 23.24 as shown in FIG. The guides 33 and 34 have a U-shaped cross section.
また、第４．５図に示すように、ホルダ２５の湧３０を
挟んで上述したカバー３１のサポート３２と対向する位
置には、サポート３２とほぼ同形状のバンド３５を設け
てあり、サポート３２とバンド３５の両端部をボルト３
６とナツト３７とによって締結しである。なお、ホルダ
２５の溝３０部分の外径に比べて、ボルト３６、ナツト
３７を締結して形成されるサポート３２とバンド３５と
からなる円筒体の内周面の径寸法が若干大きくなるよう
な関係にあらかじめ設定してあり、ボルト３６、ナツト
３７によってサポート３２とバンド３５を締結した状態
で、これらのサポート３２およびバンド３５と、ホルダ
２５とは相対的回動可能になっている。Further, as shown in FIG. 4.5, a band 35 having substantially the same shape as the support 32 is provided at a position facing the support 32 of the cover 31 described above across the spring 30 of the holder 25. and both ends of band 35 with bolt 3
6 and a nut 37. Note that the diameter of the inner circumferential surface of the cylindrical body formed by the support 32 and band 35 formed by fastening the bolt 36 and nut 37 is slightly larger than the outer diameter of the groove 30 portion of the holder 25. The relationship is set in advance, and with the support 32 and the band 35 fastened together by the bolt 36 and the nut 37, the support 32, the band 35, and the holder 25 can rotate relative to each other.
上記したカバー３１のサポート３２と、バンド３５と、
ボルト３６およびナツト３７は、カバー３１と、ロッド
２２に固定されたホルダ２５とを相対的回動可能に係合
させる第１の係合手段を構成しており、上記したカバー
３１のガイド３３．３４とチューブ２１に一体的に設け
たレール２３．２４とは、カバー３１とチューブ２１と
を相対的回動自在に係合させる第２の係合手段を構成し
ている。The support 32 of the cover 31 described above, the band 35,
The bolt 36 and the nut 37 constitute a first engagement means for relatively rotatably engaging the cover 31 and the holder 25 fixed to the rod 22, and the guide 33 of the cover 31 described above. 34 and the rails 23, 24 provided integrally with the tube 21 constitute a second engagement means for relatively rotatably engaging the cover 31 and the tube 21.
上記のように構成される実施例にあっては、第６図に示
すように、半割体２６−１２７をボルト２９で締結する
ことによってロッド２２にホルダ２５を固定した状態に
しておいて、カバー３１のガイド３３．３４をチューブ
２１のレール２３．２４に係合させ、カバー３１のサポ
ート３２をホルダ２５の溝３０に係合させ、バンド３５
をサポート３２と対応する位置に配置し、ボルト３６と
ナツト３７でバンド３５とサポート３２とを締結するこ
とにより、容易にカバー３１をロッド２２に装着するこ
とができ、また、ボルト３６、ナツト３７を外すことに
より容易にカバー３１をロッド２２から離脱させること
ができる。In the embodiment configured as described above, as shown in FIG. 6, the holder 25 is fixed to the rod 22 by fastening the half body 26-127 with the bolt 29, The guides 33.34 of the cover 31 are engaged with the rails 23.24 of the tube 21, the supports 32 of the cover 31 are engaged with the grooves 30 of the holder 25, and the bands 35
The cover 31 can be easily attached to the rod 22 by arranging it at a position corresponding to the support 32 and fastening the band 35 and support 32 with the bolt 36 and nut 37. By removing the cover 31, the cover 31 can be easily separated from the rod 22.
そして、第１２図に示すように、パケットシリンダ２０
の伸縮に伴い、カバー３１のサポート３２がホルダ２５
に係合していることから、当該カバー３１がロッド２２
と一体的に移動し、このカバー３１によってロッド２２
が外部の岩石等の異物から保護され、当該ロッド２２の
損傷を確実に防止することができる。Then, as shown in FIG. 12, the packet cylinder 20
As the support 32 of the cover 31 expands and contracts, the holder 25
Since the cover 31 is engaged with the rod 22, the cover 31 is engaged with the rod 22.
The cover 31 moves integrally with the rod 22.
is protected from foreign objects such as external rocks, and damage to the rod 22 can be reliably prevented.
また、ボルト３６、ナツト３７によって締結された状態
にあるサポート３２およびバンド３５と、ホルダ２５と
が相対的回動可能になっていることから、ホルダ２５が
固定されるロッド２２とカバー３１とが相対的回動可能
になっており、したがって偏荷重等を受けて、チューブ
２１とロッド２２との間にわずかな回動を生じても、そ
の回動はホルダ２５と、サポート３２およびバンド３５
との間の回動として吸収され、したがってカッ＜−３１
にねじりモーメントが伝えられることがなく、ロッド２
２の伸縮に伴ってカバー３１のガイド３３．３４がレー
ル２３．２４上を摺動することができ、すなわち、球面
軸受を備えたこのブームシリンダ２０に何ら支障なく適
用することができる。Further, since the support 32 and the band 35, which are fastened by the bolts 36 and nuts 37, and the holder 25 can rotate relative to each other, the rod 22 to which the holder 25 is fixed and the cover 31 can be rotated relative to each other. They are relatively rotatable, so even if a slight rotation occurs between the tube 21 and the rod 22 due to an unbalanced load, the rotation will be caused by the holder 25, the support 32 and the band 35.
is absorbed as a rotation between
No torsional moment is transmitted to rod 2.
2, the guides 33.34 of the cover 31 can slide on the rails 23.24, which means that this boom cylinder 20 with spherical bearings can be applied without any problems.
なお、上記実施例にあっては、液圧シリンダとして油圧
ショベルに備えられるパケットシリンダ２０を挙げたが
、本考案はこれに限られず、アームシリンダ、ブームシ
リンダに適用することもでき、また他の建設機械等に備
えられる油圧シリンダに適用することもできる。In the above embodiment, the packet cylinder 20 installed in a hydraulic excavator is used as the hydraulic cylinder, but the present invention is not limited to this, and can also be applied to an arm cylinder or a boom cylinder, or can be applied to other cylinders. It can also be applied to hydraulic cylinders provided in construction machinery and the like.
〈発明の効果〉
本発明の液圧シリンダの保護装置は、以上のように構成
しであることから、液圧シリンダに対する着脱が容易で
、この着脱作業工数が少なくて済み、またロッドの損傷
を確実に防止でき、したがってこのような損傷に伴う作
動油の流出を防止でき、また、球面軸受で接続されるも
のにも適用可能であり、汎用性に富む効果がある。<Effects of the Invention> Since the hydraulic cylinder protection device of the present invention is configured as described above, it can be easily attached and detached from the hydraulic cylinder, reducing the number of man-hours required for this attachment and detachment work, and prevents damage to the rod. It is possible to reliably prevent such damage, thereby preventing the leakage of hydraulic oil due to such damage, and it is also applicable to devices connected by spherical bearings, resulting in a highly versatile effect.
第１図〜第６図は本発明の液圧シリンダの保護装置の一
実施例を油圧シリンダに適用した場合を示す説明図で、
第１図は油圧シリンダの伸長時を示す断面部分を含む側
面図、第２図は油圧シリンダの収縮時を示す断面部分を
含む側面図、第３図は第１図のＡ矢視に相応する拡大断
面図、第４図は第１図のＢ部拡大図、第５図は第４図の
Ｃ矢視に相応する断面図、第６図は第４図のＤ矢視に相
応する断面図、第７図は液圧シリンダの一例としての油
圧シリンダが具備される油圧ショベルを示す側面図、第
８図は第７図に示す油圧シリンダが接続される球面軸受
を例示する断面図である。
２０・・・・・・パケットシリンダ、２１・・・・・・
チューブ、２７・・・・・・ロッド、２３．２４・・・
・・・レール、２５・・・・・・ホルダ、２６．２７・
・・・・・半割体、２８・・・・・・ねじ穴、２９・・
・・・・ボルト、３０・・・・・・溝、３１・・・・・
・カバー、３２・・・・・・サポート、３３．３４・・
・・・・ガイド、３５・・・・・・バンド、３６・・・
・・・ボルト、３７・・・・・・ナツト。
第３図
第４図
２ど ２ソ ２６ ｊり ２ン
第５図
第６図FIGS. 1 to 6 are explanatory diagrams showing a case where an embodiment of the hydraulic cylinder protection device of the present invention is applied to a hydraulic cylinder,
Fig. 1 is a side view including a cross section showing the hydraulic cylinder when it is extended, Fig. 2 is a side view including a cross section showing the hydraulic cylinder when it is retracted, and Fig. 3 corresponds to the direction of arrow A in Fig. 1. 4 is an enlarged view of part B in FIG. 1, FIG. 5 is a sectional view corresponding to the C arrow direction in FIG. 4, and FIG. 6 is a sectional view corresponding to the D arrow direction in FIG. 4. , FIG. 7 is a side view showing a hydraulic excavator equipped with a hydraulic cylinder as an example of a hydraulic cylinder, and FIG. 8 is a cross-sectional view illustrating a spherical bearing to which the hydraulic cylinder shown in FIG. 7 is connected. 20...Packet cylinder, 21...
Tube, 27...Rod, 23.24...
...Rail, 25...Holder, 26.27.
...Half body, 28...Screw hole, 29...
...Bolt, 30...Groove, 31...
・Cover, 32...Support, 33.34...
...Guide, 35...Band, 36...
...Boruto, 37...Natsuto. Figure 3 Figure 4 2nd 2 So 26
Claims (1)
記ロッドを被覆可能なカバーと、このカバーと上記ホル
ダとを相対的回動可能に係合させる第１の係合手段と、
上記カバーと液圧シリンダのチューブとを相対的摺動自
在に係合させる第２の係合手段とを備えたことを特徴と
する液圧シリンダの保護装置。(1) a holder fixed to a rod of a hydraulic cylinder, a cover capable of covering the rod, and a first engagement means for relatively rotatably engaging the cover and the holder;
A protection device for a hydraulic cylinder, comprising: second engagement means for relatively slidably engaging the cover and the tube of the hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25154187A JPH0198701A (en) | 1987-10-07 | 1987-10-07 | Protection device for hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25154187A JPH0198701A (en) | 1987-10-07 | 1987-10-07 | Protection device for hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0198701A true JPH0198701A (en) | 1989-04-17 |
Family
ID=17224355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25154187A Pending JPH0198701A (en) | 1987-10-07 | 1987-10-07 | Protection device for hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0198701A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0236604U (en) * | 1988-08-31 | 1990-03-09 | ||
| JPH03103352U (en) * | 1990-02-13 | 1991-10-28 | ||
| JPH04105144U (en) * | 1991-02-20 | 1992-09-10 | セイレイ工業株式会社 | Boom structure in backhoe etc. |
| EP1593857A1 (en) * | 2004-05-04 | 2005-11-09 | Volvo Construction Equipment Holding Sweden AB | Cylinder protective apparatus for preventing strange noise |
| WO2008112487A1 (en) * | 2007-03-12 | 2008-09-18 | Actuant Corporation | Jack with scale including protective cover |
| JP2009155971A (en) * | 2007-12-27 | 2009-07-16 | Hitachi Constr Mach Co Ltd | Handrail apparatus of construction equipment |
| JP2017053106A (en) * | 2015-09-07 | 2017-03-16 | コベルコ建機株式会社 | Protective structure for cylinder and work machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5320640U (en) * | 1976-07-29 | 1978-02-21 | ||
| JPS6223671U (en) * | 1985-07-30 | 1987-02-13 |
-
1987
- 1987-10-07 JP JP25154187A patent/JPH0198701A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5320640U (en) * | 1976-07-29 | 1978-02-21 | ||
| JPS6223671U (en) * | 1985-07-30 | 1987-02-13 |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0236604U (en) * | 1988-08-31 | 1990-03-09 | ||
| JPH03103352U (en) * | 1990-02-13 | 1991-10-28 | ||
| JPH04105144U (en) * | 1991-02-20 | 1992-09-10 | セイレイ工業株式会社 | Boom structure in backhoe etc. |
| EP1593857A1 (en) * | 2004-05-04 | 2005-11-09 | Volvo Construction Equipment Holding Sweden AB | Cylinder protective apparatus for preventing strange noise |
| US7165487B2 (en) | 2004-05-04 | 2007-01-23 | Volvo Construction Equipment Holding Sweden Ab | Cylinder protective apparatus for preventing strange noise |
| WO2008112487A1 (en) * | 2007-03-12 | 2008-09-18 | Actuant Corporation | Jack with scale including protective cover |
| JP2009155971A (en) * | 2007-12-27 | 2009-07-16 | Hitachi Constr Mach Co Ltd | Handrail apparatus of construction equipment |
| JP2017053106A (en) * | 2015-09-07 | 2017-03-16 | コベルコ建機株式会社 | Protective structure for cylinder and work machine |
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