JPS5845299U - Shock prevention device during full free mast descent - Google Patents
Shock prevention device during full free mast descentInfo
- Publication number
- JPS5845299U JPS5845299U JP14114881U JP14114881U JPS5845299U JP S5845299 U JPS5845299 U JP S5845299U JP 14114881 U JP14114881 U JP 14114881U JP 14114881 U JP14114881 U JP 14114881U JP S5845299 U JPS5845299 U JP S5845299U
- Authority
- JP
- Japan
- Prior art keywords
- mast
- lift cylinder
- fork
- prevention device
- full free
- 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
Landscapes
- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は、本考案に係る降下時ショック防止装置をフル
フリー二段マストに適用した最大揚高時の状態を示す略
式側面図。第２図は、降下途中の状態を示す同様図。第
３図は、最小揚高時の状態を示す同様図。第４図は、制
御弁の構造並びに油圧回路を示す要部縦断側面図。第５
図は、制御弁の作動状態を示す要部のみの縦断側面図。
第６図乃至第９図は、従来のフルフリー二段マストの構
造並びに作動順序を示す略式側面図。第１０図は、従来
のフルフーリー三段マストの構造を示す略式側面図であ
る。
１・・・・・・降下時ショック防止装置、２・・・・・
・制御弁、２０・・・・・・フルフリ−マスト、２１・
・・・・・固定マスト、２２・・・・・・移動マスト、
２３・・・・・・昇降体、２４・・・・・・フォーク、
２５・・・・・・マスト用リフトシリンダ、２６・・・
・・・フォーク用リフト・シリンダ、２９・・・・・・
テール室、３１・・・・・・導路、Ｐ・・・・・・ポン
プ、■・・・・・・切門弁、Ｆ、Ｖ・・・・・・フロー
コントロールバルブ。FIG. 1 is a schematic side view showing the state at maximum lifting height when the descending shock prevention device according to the present invention is applied to a full-free two-stage mast. FIG. 2 is a similar diagram showing the state during descent. FIG. 3 is a similar diagram showing the state at the minimum lifting height. FIG. 4 is a longitudinal sectional side view of the main parts showing the structure and hydraulic circuit of the control valve. Fifth
The figure is a vertical sectional side view of only the main parts showing the operating state of the control valve. 6 to 9 are schematic side views showing the structure and operation sequence of a conventional full-free two-stage mast. FIG. 10 is a schematic side view showing the structure of a conventional full-foury three-stage mast. 1...Descent shock prevention device, 2...
・Control valve, 20...Full free mast, 21・
...Fixed mast, 22...Movable mast,
23... Lifting body, 24... Fork,
25... Lift cylinder for mast, 26...
...Forklift cylinder, 29...
Tail chamber, 31... Conduit, P... Pump, ■... Cut valve, F, V... Flow control valve.
Claims (1)
２２と、この移動マスト２２に沿って動き得る昇降体２
３と、該昇降体２３に懸架したフォーク２４と、固定マ
スト２１に対して移動マスト２２を昇降駆動させるマス
ト用リフトシリンダ２５と、移動マスト２２に対して昇
降体２３及びフォーク２４を昇降駆動させるフォーク用
リフトシリンダ２６とを各具有し、前記マスト用シリン
ダ２５とフォーク用リフトシリンダ２６の各テール室２
９．３０がフローコントロールバルブＦ＠Ｖそして切換
弁Ｖを介してポンプＰに接続されたフルフリ−マストに
於て、前記マスト用リフトシリンダ２５のテール室２９
とフローコントロールバルブＦ・■との導路３１中に該
マスト用リフトシリンダ２５の降下運動のみを抑制する
制御弁２を介設し、フォーク用リフトシリンダ２６とマ
スト用リフトシリンダ２５とが略同時に短縮する様に構
成した事を特徴とするフルフリ−マストの降下時ショッ
ク防止装置。A fixed mast 21, a movable mast 22 that can be raised and lowered with respect to the fixed mast 21, and an elevating body 2 that can move along the movable mast 22.
3, a fork 24 suspended on the elevating body 23, a mast lift cylinder 25 that drives the movable mast 22 up and down with respect to the fixed mast 21, and a lift cylinder 25 that drives the elevating body 23 and the fork 24 up and down with respect to the movable mast 22. Each tail chamber 2 of the mast cylinder 25 and the fork lift cylinder 26 has a fork lift cylinder 26.
9.30 is a full free mast connected to a pump P via a flow control valve F@V and a switching valve V, and the tail chamber 29 of the mast lift cylinder 25 is
A control valve 2 that suppresses only the descending movement of the mast lift cylinder 25 is interposed in the conduit 31 between the fork lift cylinder 26 and the mast lift cylinder 25 at almost the same time. A shock prevention device when a full free mast is lowered, characterized by being shortened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14114881U JPS5845299U (en) | 1981-09-22 | 1981-09-22 | Shock prevention device during full free mast descent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14114881U JPS5845299U (en) | 1981-09-22 | 1981-09-22 | Shock prevention device during full free mast descent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5845299U true JPS5845299U (en) | 1983-03-26 |
| JPS6211919Y2 JPS6211919Y2 (en) | 1987-03-23 |
Family
ID=29934270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14114881U Granted JPS5845299U (en) | 1981-09-22 | 1981-09-22 | Shock prevention device during full free mast descent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5845299U (en) |
-
1981
- 1981-09-22 JP JP14114881U patent/JPS5845299U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6211919Y2 (en) | 1987-03-23 |
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