JPS63165349U - - Google Patents
Info
- Publication number
- JPS63165349U JPS63165349U JP5686887U JP5686887U JPS63165349U JP S63165349 U JPS63165349 U JP S63165349U JP 5686887 U JP5686887 U JP 5686887U JP 5686887 U JP5686887 U JP 5686887U JP S63165349 U JPS63165349 U JP S63165349U
- Authority
- JP
- Japan
- Prior art keywords
- pilot
- control valve
- lines
- throttle
- pilot lines
- 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.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は本考案の実施例である要部の回路図を
示し、第２図はバツクホーの側面図、第３図は第
２図の作動説明図を示す。
１：主ブーム、２：主ブームシリンダ、３：コ
ントロールバルブ、３ａ，３ｂ：パイロツト室、
４：油圧パイロツト、５ａ，５ｂ：パイロツトラ
イン、６：ボトム側油圧ライン、７：方向切換弁
、８：絞り。
FIG. 1 shows a circuit diagram of the main parts of an embodiment of the present invention, FIG. 2 shows a side view of a backhoe, and FIG. 3 shows an explanatory diagram of the operation of FIG. 2. 1: Main boom, 2: Main boom cylinder, 3: Control valve, 3a, 3b: Pilot chamber,
4: Hydraulic pilot, 5a, 5b: Pilot line, 6: Bottom side hydraulic line, 7: Directional switching valve, 8: Throttle.
Claims (1)
リンダに連通するコントロールバルブ３のパイロ
ツト室３ａ，３ｂには油圧パイロツト４からの両
パイロツトライン５ａ，５ｂを連通連設して構成
するバツクホーにおいて、前記主ブームシリンダ
２のボトム側油圧ライン６と一方の前記パイロツ
トライン５ａとの間には、直列にした方向切換弁
７と絞り８を介装して構成したことを特徴とする
作業機の降下に対する装置。 The pilot chambers 3a and 3b of the control valve 3, which communicate with the double-acting cylinder for operating the work equipment arranged at the front of the machine, are equipped with backholes configured by connecting both pilot lines 5a and 5b from the hydraulic pilot 4. A work machine characterized in that a directional control valve 7 and a throttle 8 are interposed in series between the bottom side hydraulic line 6 of the main boom cylinder 2 and one of the pilot lines 5a. device for the descent of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987056868U JPH0617885Y2 (en) | 1987-04-14 | 1987-04-14 | Safety device for work machine descent in backhoe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987056868U JPH0617885Y2 (en) | 1987-04-14 | 1987-04-14 | Safety device for work machine descent in backhoe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63165349U true JPS63165349U (en) | 1988-10-27 |
| JPH0617885Y2 JPH0617885Y2 (en) | 1994-05-11 |
Family
ID=30886060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987056868U Expired - Lifetime JPH0617885Y2 (en) | 1987-04-14 | 1987-04-14 | Safety device for work machine descent in backhoe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617885Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001336177A (en) * | 2000-05-31 | 2001-12-07 | Hitachi Constr Mach Co Ltd | Hydraulic circuit for construction machine and urgent drive method for attachment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5235437U (en) * | 1975-09-04 | 1977-03-12 |
-
1987
- 1987-04-14 JP JP1987056868U patent/JPH0617885Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5235437U (en) * | 1975-09-04 | 1977-03-12 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0617885Y2 (en) | 1994-05-11 |
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