JPS6330799Y2 - - Google Patents
Info
- Publication number
- JPS6330799Y2 JPS6330799Y2 JP1979096753U JP9675379U JPS6330799Y2 JP S6330799 Y2 JPS6330799 Y2 JP S6330799Y2 JP 1979096753 U JP1979096753 U JP 1979096753U JP 9675379 U JP9675379 U JP 9675379U JP S6330799 Y2 JPS6330799 Y2 JP S6330799Y2
- Authority
- JP
- Japan
- Prior art keywords
- down control
- lift cylinder
- control valve
- pipe
- lift
- 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.)
- Expired
Links
- 238000010586 diagram Methods 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
Landscapes
- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Description
【考案の詳細な説明】
この考案は管路が損傷しても荷物が落下するこ
とのないフオークリフトトラツクの油圧回路に関
する。[Detailed Description of the Invention] This invention relates to a hydraulic circuit for a forklift truck that prevents cargo from falling even if the pipeline is damaged.
従来２本のリフトシリンダをタンデムに具えた
フオークリフトトラツクにあつては、各リフトシ
リンダの底部にダウンコントロール弁を設ける
か、各リフトシリンダの底部と操作弁の間を接続
する管路の途中に、ダウンコントロール弁を介在
させた油圧回路を採用している。しかし前者の油
圧回路では２本のリフトシリンダの同期性が悪
く、安定した制御が難しい欠点があり、後者の油
圧回路では、リフトシリンダと操作弁の間を接続
する管路が損傷すると、荷役中の荷物が落下する
などの危険があつた。 Conventionally, for forklift trucks equipped with two lift cylinders in tandem, a down control valve is provided at the bottom of each lift cylinder, or a down control valve is provided in the middle of the pipe connecting between the bottom of each lift cylinder and the operation valve. , a hydraulic circuit with a down control valve is used. However, in the former hydraulic circuit, the synchronization between the two lift cylinders is poor and stable control is difficult.In the latter hydraulic circuit, if the pipe connecting the lift cylinder and the operating valve is damaged, it may cause damage during cargo handling. There was a danger that the luggage could fall.
この考案はかかる従来の不具合を改善する目的
でなされたもので、各リフトシリンダの同期性が
よく、かつ管路が損傷しても荷役中の荷物が落下
する心配がなく、しかも経済的にも有利なフオー
クリフトトラツクの油圧回路を提供しようとする
ものである。 This invention was made with the aim of improving such conventional problems. It has good synchronization between each lift cylinder, there is no fear that the cargo being handled will fall even if the pipe line is damaged, and it is also economical. It is an object of the present invention to provide an advantageous forklift truck hydraulic circuit.
以下この考案を図示の一実施例について詳述す
る。図において１及び２は図示しないフオークリ
フトトラツクのマストに装備されたリフトシリン
ダで、ピストン杆１ａ及び２ａが機械的に連動さ
れていると共に、これらリフトシリンダ１，２に
よりマスト及びマストに取付けられたフオークが
昇降動される。またこれらリフトシリンダ１，２
の一方の底部にはダウンコントロール弁３が設け
られていて、このダウンコントロール弁３を介し
てリフトシリンダ１の底部と、リフトシリンダ２
の底部が管路４により連通されていると共に、管
路４の途中には管路５により別のダウンコントロ
ール弁６を介して操作弁７が接続されている。 This invention will be described in detail below with reference to an illustrated embodiment. In the figure, 1 and 2 are lift cylinders installed on the mast of a forklift truck (not shown), and piston rods 1a and 2a are mechanically interlocked, and the lift cylinders 1 and 2 are attached to the mast and the mast. The fork is raised and lowered. Also, these lift cylinders 1 and 2
A down control valve 3 is provided at one bottom of the lift cylinder 1, and the bottom of the lift cylinder 1 and the lift cylinder 2 are connected via this down control valve 3.
The bottoms of the two are connected to each other by a pipe 4, and an operating valve 7 is connected to the middle of the pipe 4 by a pipe 5 via another down control valve 6.
この考案は以上詳述したようになるから、操作
弁７を操作して各リフトシリンダ１，２の底部側
へ油圧を供給することにより、各リフトシリンダ
１，２によりフオークを介して荷物を上昇させる
ことができると共に、荷物の下降速度は、管路５
の途中に設けたダウンコントロール弁６により制
御するため、各リフトシリンダ１，２の同期性が
良く、安定して荷物を下降させることができる。
また管路４が途中で破損しても、各リフトシリン
ダ１，２は機械的に連動されていて、しかも一方
のリフトシリンダ１の底部に設けたダウンコント
ロール弁３により荷物の下降速度が制御されるた
め、荷物が落下する危険も少ない。さらに、この
考案によれば、前述の如く、一方のリフトシリン
ダ１の底部に設けたダウンコントロール弁３を介
してリフトシリンダ１の底部と他方のリフトシリ
ンダ２の底部を管路４により互に連通すると共
に、管路４と操作弁７の間を接続する管路５の途
中に別のダウンコントロール弁６を設けてなる合
理的設計配置としたから、簡単な構成で、かつ唯
２個の前記ダウンコントロール弁３，５で前述の
如き効果を全うすることができるものであつて、
経済的に有利である。 This invention is as detailed above, so by operating the operating valve 7 and supplying hydraulic pressure to the bottom side of each lift cylinder 1, 2, each lift cylinder 1, 2 lifts the load via the fork. In addition, the descending speed of the cargo can be controlled by the conduit 5.
Since the lift cylinders 1 and 2 are controlled by a down control valve 6 provided in the middle, synchronization between the lift cylinders 1 and 2 is good, and the load can be lowered stably.
Furthermore, even if the pipe line 4 is damaged midway, the lift cylinders 1 and 2 are mechanically linked, and the down control valve 3 provided at the bottom of one of the lift cylinders 1 will control the downward speed of the cargo. Therefore, there is less risk of the luggage falling. Further, according to this invention, as described above, the bottom of one lift cylinder 1 and the bottom of the other lift cylinder 2 are communicated with each other by the pipe 4 via the down control valve 3 provided at the bottom of one lift cylinder 1. At the same time, the rational design arrangement is such that another down control valve 6 is provided in the middle of the pipe line 5 that connects the pipe line 4 and the operation valve 7, so the structure is simple and only two of the above-described down control valves are provided. The down control valves 3 and 5 can achieve all the effects described above,
Economically advantageous.
図面はこの考案の一実施例を示す回路図であ
る。
１及び２はリフトシリンダ、３及び６はダウン
コントロール弁、４及び５は管路、７は操作弁。
The drawing is a circuit diagram showing an embodiment of this invention. 1 and 2 are lift cylinders, 3 and 6 are down control valves, 4 and 5 are pipelines, and 7 is an operating valve.
Claims (1)
昇降動を行うものにおいて、一方のリフトシリン
ダ１の底部にダウンコントロール弁３を設け、こ
のダウンコントロール弁３を介してリフトシリン
ダ１の底部と他方のリフトシリンダ２の底部を管
路４により互に連通すると共に、管路４と操作弁
７の間を接続する管路５の途中に別のダウンコン
トロール弁６を設けてなるフオークリフトトラツ
クの油圧回路。 In a device in which the fork is moved up and down by left and right lift cylinders 1 and 2, a down control valve 3 is provided at the bottom of one lift cylinder 1, and the bottom of the lift cylinder 1 and the other lift cylinder are connected via this down control valve 3. A hydraulic circuit for a forklift truck, in which the bottoms of the two are connected to each other by a pipe 4, and another down control valve 6 is provided in the middle of a pipe 5 that connects the pipe 4 and the operation valve 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979096753U JPS6330799Y2 (en) | 1979-07-16 | 1979-07-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979096753U JPS6330799Y2 (en) | 1979-07-16 | 1979-07-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5617300U JPS5617300U (en) | 1981-02-14 |
| JPS6330799Y2 true JPS6330799Y2 (en) | 1988-08-17 |
Family
ID=29329564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1979096753U Expired JPS6330799Y2 (en) | 1979-07-16 | 1979-07-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6330799Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6315280Y2 (en) * | 1979-12-19 | 1988-04-28 | ||
| JPH062502B2 (en) * | 1988-04-20 | 1994-01-12 | 鐘淵化学工業株式会社 | Foam synthetic resin assembly box and manufacturing method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5238821Y2 (en) * | 1972-06-09 | 1977-09-03 | ||
| JPS5617440Y2 (en) * | 1976-04-13 | 1981-04-23 | ||
| JPS6030316Y2 (en) * | 1977-12-22 | 1985-09-11 | ティー・シー・エム株式会社 | Sudden fall prevention device for lift cylinders |
-
1979
- 1979-07-16 JP JP1979096753U patent/JPS6330799Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5617300U (en) | 1981-02-14 |
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