JP4152392B2 - 荷役作業車 - Google Patents
荷役作業車 Download PDFInfo
- Publication number
- JP4152392B2 JP4152392B2 JP2005099157A JP2005099157A JP4152392B2 JP 4152392 B2 JP4152392 B2 JP 4152392B2 JP 2005099157 A JP2005099157 A JP 2005099157A JP 2005099157 A JP2005099157 A JP 2005099157A JP 4152392 B2 JP4152392 B2 JP 4152392B2
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- JP
- Japan
- Prior art keywords
- valve
- loading platform
- lowering
- hydraulic
- oil
- 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.)
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- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
- Handcart (AREA)
Description
5 昇降用シリンダ
14 油タンク
15 油圧ポンプ
10 油圧ベース
23 昇降切換バルブ
37 昇降レバー
50 急下降防止バルブ
51 バルブスプール
51c 切欠
70 圧力調節バルブ
100 荷役作業車(ハンドリフトトラック)
Claims (2)
- 荷台(1)を昇降自在に支持する昇降用シリンダ(5)と、該昇降用シリンダ(5)を駆動する油圧ポンプ(15)と、油タンク(14)と、前記昇降用シリンダ(5)と油圧ポンプ(15)と油タンク(14)の接続を切り換えて「上昇位置」及び「停止位置」及び「下降位置」の三位置の切換えを行なう昇降切換バルブ(23)と、を備える荷役作業車(100)において、前記昇降切換バルブ(23)に加えて、急下降防止バルブ(50)を具備し、該急下降防止バルブ(50)は、切欠(51c)を設けたバルブスプール(51)と、前スプリング(52)と、後スプリング(54)と、調節ネジ(78)により構成し、該バルブスプール(51)を、前スプリング(52)と後スプリング(54)の間に配設し、該後スプリング(54)の付勢力を、前スプリング(52)の付勢力よりも強く構成し、両スプリング(52・54)によりバランスがとれた状態とし、該荷台(1)に荷物を載せない無負荷時や、軽い荷物を載せた軽負荷時には、バルブスプール(51)は弁座部(60e)から離れて開いた状態とし、昇降切換バルブ(23)を操作する昇降レバー(37)の操作により、昇降切換バルブ(23)を「下降位置」とした状態で、昇降切換バルブ(23)により急速に下降可能とし、該荷台(1)上に重い荷物が載せられている重負荷時には、該バルブスプール(51)のシリンダ側油路(60a)に大きな油圧が掛かり、該バルブスプール(51)は弁座部(60e)側に押されて閉じた状態で、該切欠(51c)からのみ作動油を流出可能な構成とし、前記前スプリング(52)と後スプリング(54)の押圧力を調整する調節ネジ(78)を設け、該調節ネジ(78)により、重負荷によるバルブスプール(51)を閉じる圧力を調節し、急下降防止バルブ(50)の作動荷重を調整可能としたことを特徴とする荷役作業車。
- 請求項1記載の荷役作業車において、前記昇降レバー(37)の操作により、前記昇降切換バルブ(23)の「下降位置」に設けた絞り(32)の絞り量を操作し、前記昇降レバー(37)の操作のみによっても、操作量に比例した流速で作動油を油タンク(14)側へ流し、希望する速度で昇降用シリンダ(5)を退入させて、荷台(1)の下降速度を調節可能としたことを特徴とする荷役作業車。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005099157A JP4152392B2 (ja) | 2005-03-30 | 2005-03-30 | 荷役作業車 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005099157A JP4152392B2 (ja) | 2005-03-30 | 2005-03-30 | 荷役作業車 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2006273263A JP2006273263A (ja) | 2006-10-12 |
JP4152392B2 true JP4152392B2 (ja) | 2008-09-17 |
Family
ID=37208403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005099157A Active JP4152392B2 (ja) | 2005-03-30 | 2005-03-30 | 荷役作業車 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4152392B2 (ja) |
-
2005
- 2005-03-30 JP JP2005099157A patent/JP4152392B2/ja active Active
Also Published As
Publication number | Publication date |
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JP2006273263A (ja) | 2006-10-12 |
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