JPS6137200B2 - - Google Patents
Info
- Publication number
- JPS6137200B2 JPS6137200B2 JP52114648A JP11464877A JPS6137200B2 JP S6137200 B2 JPS6137200 B2 JP S6137200B2 JP 52114648 A JP52114648 A JP 52114648A JP 11464877 A JP11464877 A JP 11464877A JP S6137200 B2 JPS6137200 B2 JP S6137200B2
- Authority
- JP
- Japan
- Prior art keywords
- tilt
- pump
- switch
- load
- cylinder
- 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
- 239000012530 fluid Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims 1
- 230000005284 excitation Effects 0.000 claims 1
- 210000000078 claw Anatomy 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 1
Description
【発明の詳細な説明】
本発明はフオークリフト等の荷役車両の過荷重
防止装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overload prevention device for a cargo handling vehicle such as a forklift.
従来、この種の荷役車両としては第１図に示す
如く、車体ａの前端にマストｂをマストサポート
ｃを介して前後傾動自在に装着し、該マストｂに
フオーク爪ｄを前方に向けて設けると共に、マス
トｂと車体ａとに亘つてチルトシリンダｅを枢着
連結したものが知られている。 Conventionally, as shown in FIG. 1, this type of cargo handling vehicle has a mast b attached to the front end of a vehicle body a so as to be tiltable back and forth via a mast support c, and a fork claw d is provided on the mast b so as to face forward. Also known is a tilt cylinder e that is pivotally connected between a mast b and a vehicle body a.
この構造であると、フオーク爪ｄ上の荷物ｆの
荷重はマストサポートｃ及チルトシリンダｅに作
用する。すなわち、荷重Ｗ及びその荷重中心Ｇと
マストサポートｃの枢着点c′との距離Ｌに比例し
た前回りのモーメントＭが車体ａに作用する。こ
れと同時にチルトシリンダｅのチルトバツク側室
e′には前述の前回りのモーメントＭに比例した保
持圧力が発生する。したがつて、チルトシリンダ
ｅのチルトバツク側室e′の圧力を検出することに
より前回りモーメントＭの大きさを検知できる。 With this structure, the load of the load f on the fork claw d acts on the mast support c and the tilt cylinder e. That is, a forward rotation moment M proportional to the load W and the distance L between the load center G and the pivot point c' of the mast support c acts on the vehicle body a. At the same time, the tilt back side chamber of tilt cylinder e
A holding pressure proportional to the forward rotational moment M is generated at e'. Therefore, the magnitude of the forward turning moment M can be detected by detecting the pressure in the tilt back side chamber e' of the tilt cylinder e.
一方、この構造の荷役車両では荷役作業の安全
上車体側の後回りモーメントM′に対して前回り
モーメントＭが余裕をもつて小さくなるように許
容荷重条件（距離Ｌと荷重Ｗ）を設定してある。
すなわち、後回りモーメントM′は予め所定の値
に設定されているからフオーク爪ｄ上の荷重が大
きくなつたり、距離Ｌが長くなつて、許容荷重条
件が大となり前回りモーメントＭが後回りモーメ
ントM′よりも大きくなると車体ａは前方に転倒
し非常に危険である。 On the other hand, for cargo handling vehicles with this structure, the allowable load conditions (distance L and load W) are set so that the forward turning moment M is sufficiently smaller than the rear turning moment M' on the vehicle body side for safety during cargo handling operations. There is.
In other words, since the rearward turning moment M' is set to a predetermined value in advance, if the load on the fork pawl d increases or the distance L becomes longer, the allowable load condition increases and the forward turning moment M becomes the rearward turning moment. If it becomes larger than M', the vehicle body a will fall forward, which is very dangerous.
本発明は上記の事情に鑑みなされたものであ
り、その目的は許容荷重条件を越える過荷重が作
用すると荷役作業ができないようにして車体に過
荷重が作用するのを防止できるようにした荷役車
両の過荷重防止装置を提供することである。 The present invention was made in view of the above-mentioned circumstances, and its purpose is to provide a cargo handling vehicle that can prevent cargo handling operations from being carried out if an overload exceeding the allowable load conditions is applied, thereby preventing overload from acting on the vehicle body. An object of the present invention is to provide an overload prevention device.
以下第２図を参照して本発明の実施例を説明す
る。 An embodiment of the present invention will be described below with reference to FIG.
車体１の前端にマスト２をマストサポート３を
介して前後傾動自在に装着し、該マスト２にフオ
ーク爪４を前方に向けて設けてフオーク爪４とマ
スト２とによつて荷物支持部材としてあると共
に、マスト２と車体１とに亘つてチルトシリンダ
５を枢着連結する。 A mast 2 is attached to the front end of a vehicle body 1 via a mast support 3 so as to be tiltable back and forth, and a fork claw 4 is provided on the mast 2 facing forward, so that the fork claw 4 and the mast 2 serve as a cargo support member. At the same time, the tilt cylinder 5 is pivotally connected between the mast 2 and the vehicle body 1.
６はエンジンＭで駆動されるポンプで、その吐
出路６ａは電磁切換弁７を経てチルト操作弁８に
接続し、チルト操作弁８を中立位置Ｎからチルト
位置、チルトバツク位置に切換操作するとチ
ルトシリンダ５のチルト側室５ａ、チルトバツク
側室５ｂに接続制御されるようになつている。 Reference numeral 6 denotes a pump driven by the engine M, and its discharge passage 6a is connected to a tilt operation valve 8 via an electromagnetic switching valve 7, and when the tilt operation valve 8 is switched from the neutral position N to the tilt position or the tilt back position, the tilt cylinder is activated. The tilt side chamber 5a and the tilt back side chamber 5b of No. 5 are connected and controlled.
以上は従来のフオークリフトトラツクと全く同
一の構成である。 The above structure is exactly the same as that of a conventional forklift truck.
前記電磁切換弁７のソレノイド７ａは補助スイ
ツチ９、主スイツチ１０を経て電源１１に接続さ
れ、励磁されるとドレーン位置Ｄ、非励磁である
と連通位置Ｂに切換作動される。 The solenoid 7a of the electromagnetic switching valve 7 is connected to a power source 11 via an auxiliary switch 9 and a main switch 10, and is switched to a drain position D when energized and to a communication position B when not energized.
前記補助スイツチ９はその可動片９ａがマスト
２と対峙し、マスト２がチルトバツク姿勢（車体
１側に傾動した状態）となるとOFFとなり、そ
れ以外は常時ONとなつている。 The auxiliary switch 9 is turned OFF when its movable piece 9a faces the mast 2 and the mast 2 is in a tilt-back position (tilted toward the vehicle body 1), and otherwise remains ON.
前記主スイツチ１０は、シリンダ１２内にピス
トン１３を設けて圧力室１４を形成しかつバネ１
５で圧力室１４側に付勢すると共に、バネ室１６
側に第１、第２固定接片１７，１８を臨ませ、圧
力室１４を管路１９を経てチルトシリンダ５のチ
ルトバツツク側室５ｂに連通した構造となつてい
る。 The main switch 10 has a piston 13 disposed within a cylinder 12 to form a pressure chamber 14, and a spring 1.
5 urges the pressure chamber 14 side, and the spring chamber 16
The pressure chamber 14 is connected to the tilt back side chamber 5b of the tilt cylinder 5 through a conduit 19, with first and second fixed contact pieces 17 and 18 facing on the sides.
２０，２１はソレノイド７ａと並列に電源１１
に接続したランプ、ブザーであり、ソレノイド７
ａが励磁されると点灯、鳴動する。 20 and 21 are the power supply 11 in parallel with the solenoid 7a.
lamp and buzzer connected to solenoid 7.
When a is excited, it lights up and makes a sound.
次に作動を説明する。 Next, the operation will be explained.
図示の状態からフオーク爪４上に荷物Ａを載置
すると、その荷重Ｗを荷重中心Ｇからマストサポ
ート３の中心３′までの距離Ｌとよりなる前回り
モーメントＭが車体１に作用すると共に、チルト
シリンダ５のチルトバツク側室５ｂ内にはその前
回りモーメントＭに相当する保持圧力P1が生じ
る。 When a load A is placed on the fork claw 4 from the illustrated state, a forward turning moment M, which is made up of the load W and the distance L from the load center G to the center 3' of the mast support 3, acts on the vehicle body 1. A holding pressure P1 corresponding to the forward rotation moment M is generated in the tilt bag side chamber 5b of the tilt cylinder 5.
この保持圧力P1は管路１９を経て圧力室１４に
流入し、ピストン１３はバネ１５に抗して押動す
る。この時、前回りモーメントＭが許容値より大
きい（フオーク爪４上の荷物Ａが許容荷重条件以
上の時）と保持圧力P1も大きくなつてピストン１
３がバネ１５に抗して押動されて第１、第２固定
接片１７，１８を短結する。 This holding pressure P 1 flows into the pressure chamber 14 through the conduit 19, and the piston 13 is pushed against the spring 15. At this time, when the forward rotation moment M is larger than the allowable value (when the load A on the fork claw 4 is greater than the allowable load condition), the holding pressure P 1 also increases and the piston 1
3 is pushed against the spring 15 to shorten the first and second fixed contact pieces 17 and 18.
すると、電源１１とソレノイド７ａとが導通し
励磁されて電磁切換弁７はドレーン位置Ｄとな
り、ポンプ６の吐出流体はドレーンＴに流出する
から、チルト操作弁８には吐出流体が供給されな
い。 Then, the power source 11 and the solenoid 7a are connected and excited, and the electromagnetic switching valve 7 is placed in the drain position D, and the fluid discharged from the pump 6 flows out to the drain T, so that the tilt operation valve 8 is not supplied with fluid.
したがつて、マスト１をチルトバツクできない
ので荷役作業が実施できず、車体１に過荷重が作
用することを未然に防止できる。 Therefore, since the mast 1 cannot be tilted back, cargo handling operations cannot be carried out, and overload can be prevented from being applied to the vehicle body 1.
これと同時にランプ２０、ブザー２１が点灯鳴
動するからオペレータは過荷重が作用したことを
感知できる。 At the same time, the lamp 20 and buzzer 21 light up and sound, allowing the operator to sense that an overload has been applied.
なお、正常荷重条件の時にチルト操作弁８チル
トバツク位置とするとチルトシリンダ５のチル
トバツク側室５ｂに圧力が供給されてマスト２が
チルトバツク姿勢となり、ストロークエンドとな
るとチルトバツク側室５ｂ内の油圧力が上昇し主
スイツチ１０がONとなるが、マスト２がストロ
ークエンドとなると補助スイツチ９がOFFとな
るのでソレノイド７ａと電源１１とが導通しな
い。 Note that when the tilt operation valve 8 is set to the tiltback position under normal load conditions, pressure is supplied to the tiltback side chamber 5b of the tilt cylinder 5, and the mast 2 assumes the tiltback posture.At the end of the stroke, the hydraulic pressure in the tiltback side chamber 5b increases and the main The switch 10 is turned on, but when the mast 2 reaches the end of its stroke, the auxiliary switch 9 is turned off, so that the solenoid 7a and the power source 11 are not electrically connected.
したがつて、正常荷重条件の時には従来と同様
に操作して荷役作業できる。 Therefore, under normal load conditions, cargo handling operations can be performed in the same manner as before.
第３図は他の実施例であり、ソレノイド７ａを
前述と同様に構成された第２主スイツチ１０′を
介して電源１１に接続し、第２主スイツチ１０′
の圧力室１４′をフオーク爪昇降用シリンダ２２
の上げ側室２２ａに管路２３を経て連通した構造
であり、該上げ側室２２ａにはリフト操作弁２４
を経てポンプ６の吐出流体が供給される。 FIG. 3 shows another embodiment, in which the solenoid 7a is connected to the power source 11 via the second main switch 10' configured in the same manner as described above, and the second main switch 10'
The pressure chamber 14' is connected to the fork claw lifting cylinder 22.
The lift side chamber 22a is connected to the lift side chamber 22a through a conduit 23, and the lift operation valve 24 is connected to the lift side chamber 22a.
The discharge fluid of the pump 6 is supplied through the pump 6.
このように構成すれば、フオーク爪４上の荷重
Ｗが許容荷重以上の場合には上げ側室２２ａ内の
圧力が高圧となつて第２主スイツチ１０′がONと
なり、前述と同様にポンプ６の吐出流体はドレー
ンＴに流出すると同時にランプ２０、ブザー２１
が点灯、鳴動する。 With this configuration, when the load W on the fork claw 4 is equal to or greater than the allowable load, the pressure in the raising side chamber 22a becomes high and the second main switch 10' is turned on, and the pump 6 is turned on as described above. The discharged fluid flows out to the drain T, and at the same time the lamp 20 and the buzzer 21
lights up and sounds.
したがつて、フオーク爪４上に許容荷重Ｗ以上
の荷重Ｗの荷物Ａが載置された時にはフオーク爪
昇降用シリンダ２２の上げ側室２２ａにポンプ６
の吐出流体を供給することができず、荷役作業が
実施できないので、車体１に過荷重が作用するこ
とを未然に防止できる。なお、許容荷重条件以上
の過荷重が作用した場合には第２図に示す実施例
と同様に作動することは勿論である。 Therefore, when a load A with a load W greater than the allowable load W is placed on the fork claw 4, the pump 6 is placed in the raising side chamber 22a of the fork claw lifting cylinder 22.
Since the discharge fluid cannot be supplied and cargo handling operations cannot be carried out, it is possible to prevent an overload from being applied to the vehicle body 1. It goes without saying that when an overload exceeding the allowable load condition is applied, the system operates in the same manner as the embodiment shown in FIG. 2.
また、フオーク爪昇降用シリンダ２２が上昇ス
トロークエンドとなると、補助スイツチ９′が
OFFとなるのでソレノイド７ａと電源１１とが
導通しない。 Also, when the fork pawl lifting cylinder 22 reaches the end of its upward stroke, the auxiliary switch 9' is activated.
Since it is OFF, solenoid 7a and power supply 11 are not electrically connected.
したがつて、正常荷重条件の時には従来と同様
に操作しても荷役作業ができる。 Therefore, under normal load conditions, cargo handling operations can be carried out in the same manner as before.
第４図、第５図は許容荷重条件と許容荷重とを
示す線図であり、イは許容荷重条件を越える過荷
重、ロは最大許容荷重以上の過荷重である。 4 and 5 are diagrams showing allowable load conditions and allowable loads, where A indicates an overload that exceeds the allowable load conditions, and B indicates an overload that exceeds the maximum allowable load.
なお、第２図、第３図において２５，２５′は
走行時の振動によるピーク圧を緩和する緩和弁で
ある。 In addition, in FIGS. 2 and 3, reference numerals 25 and 25' indicate relaxation valves that relieve peak pressure caused by vibrations during running.
本発明は前述のように構成したので、許容荷重
条件を越える過荷重が作用すると荷役作業が実施
できない。 Since the present invention is configured as described above, cargo handling operations cannot be performed if an overload exceeding the allowable load condition is applied.
したがつて、車体１に過荷重が作用することを
未然に防止できる。 Therefore, it is possible to prevent an overload from being applied to the vehicle body 1.
また、補助スイツチ９によつて荷重支持部材の
チルトバツク方向の傾動ストロークエンドを検知
すると、電磁切換弁７のドレーン位置への切換え
作動を阻止するので、傾動ストロークエンドに達
してチルト保持回路がリリーフ弁で設定されたリ
リーフ圧力となつても電磁切換弁７がドレーン位
置へ切換え作動しないから荷役作業に何ら支障が
ない。 Furthermore, when the auxiliary switch 9 detects the end of the tilt stroke of the load support member in the tilt back direction, it prevents the electromagnetic switching valve 7 from switching to the drain position. Since the electromagnetic switching valve 7 switches to the drain position and does not operate even when the relief pressure reaches the set value, there is no problem in cargo handling operations.
つまり、許容荷重条件以下の荷重の場合にはチ
ルトシリンダ５によつて荷物支持部材２，４を傾
動ストロークエンドまで作動して、その位置で保
持できる。 That is, when the load is less than the allowable load condition, the load supporting members 2 and 4 can be operated to the end of the tilting stroke by the tilt cylinder 5 and held at that position.
第１図は従来例の説明図、第２図、第３図は本
発明の異なる実施例を示す説明図、第４図、第５
図は許容荷重条件と許容荷重との関係を示す表図
である。
１は車体、２，４は荷物支持部材、５はチルト
シリンダ、６はポンプ、７は電磁切換弁、７ａは
ソレノイド、８はチルト操作弁、１０はスイツ
チ。
FIG. 1 is an explanatory diagram of a conventional example, FIGS. 2 and 3 are explanatory diagrams showing different embodiments of the present invention, and FIGS.
The figure is a table showing the relationship between allowable load conditions and allowable loads. 1 is a vehicle body, 2 and 4 are cargo support members, 5 is a tilt cylinder, 6 is a pump, 7 is an electromagnetic switching valve, 7a is a solenoid, 8 is a tilt operation valve, and 10 is a switch.
Claims (1)
チルト・チルトバツク傾動可能に装着し、該チル
トシリンダ５とポンプ６との間に、チルトシリン
ダ５のチルト側室５ａ、チルトバツク側室５ｂに
ポンプ６の吐出流体を供給するチルト操作弁８を
設けた荷役車両において、前記チルトシリンダ５
のチルト保持回路に接続しかつ許容荷重条件に相
当する保持圧P1に作動圧を設定したスイツチ１０
を設け、該スイツチ１０を、チルト操作弁８とポ
ンプ６との間に設けた電磁切換弁７のソレノイド
７ａの励磁回路に設け、許容荷重条件以上の過荷
重が作用すると電磁切換弁７が、ポンプ６の吐出
流体をチルト操作弁８に供給する連通位置から吐
出流体をドレーンに供給するドレーン位置に切換
わるように構成し、さらに前記荷物支持部材のチ
ルトバツク方向の傾動ストロークエンドを検出す
る補助スイツチ９を設け、該補助スイツチ９の検
出信号で前記電磁切換弁７のドレーン位置への切
換えを阻止するように構成したことを特徴とする
荷役車両の過荷重防止装置。1. A cargo support member is mounted on the vehicle body 1 so as to be tiltable and tiltable by a tilt cylinder 5, and between the tilt cylinder 5 and the pump 6, the discharge fluid of the pump 6 is placed in the tilt side chamber 5a of the tilt cylinder 5 and the tilt side chamber 5b of the tilt cylinder 5. In the cargo handling vehicle equipped with a tilt operation valve 8 that supplies the tilt cylinder 5
switch 10 connected to the tilt holding circuit of
The switch 10 is provided in the excitation circuit of the solenoid 7a of the electromagnetic switching valve 7 provided between the tilt operation valve 8 and the pump 6, and when an overload exceeding the allowable load condition acts, the electromagnetic switching valve 7 An auxiliary switch configured to switch from a communication position where fluid discharged from the pump 6 is supplied to the tilt operation valve 8 to a drain position where fluid discharged from the pump 6 is supplied to a drain, and further configured to detect the end of the tilting stroke of the load supporting member in the tilt back direction. 9, and is configured to prevent switching of the electromagnetic switching valve 7 to the drain position by a detection signal from the auxiliary switch 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11464877A JPS5449752A (en) | 1977-09-26 | 1977-09-26 | Overload preventive apparatus for material handling vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11464877A JPS5449752A (en) | 1977-09-26 | 1977-09-26 | Overload preventive apparatus for material handling vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5449752A JPS5449752A (en) | 1979-04-19 |
| JPS6137200B2 true JPS6137200B2 (en) | 1986-08-22 |
Family
ID=14643056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11464877A Granted JPS5449752A (en) | 1977-09-26 | 1977-09-26 | Overload preventive apparatus for material handling vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5449752A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS626486A (en) * | 1985-07-01 | 1987-01-13 | Nec Corp | Semiconductor memory device |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57131699A (en) * | 1981-02-04 | 1982-08-14 | Toyoda Automatic Loom Works | Method and device for displaying load of forklift truck |
| US4511974A (en) * | 1981-02-04 | 1985-04-16 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Load condition indicating method and apparatus for forklift truck |
| JPS57131700A (en) * | 1981-02-09 | 1982-08-14 | Toyoda Automatic Loom Works | Method and device for displaying load of forklift truck |
| JPS62111897A (en) * | 1985-11-05 | 1987-05-22 | 西尾レントオ−ル株式会社 | Elevator |
| JP7311237B2 (en) * | 2021-09-03 | 2023-07-19 | 三菱ロジスネクスト株式会社 | Forklift with spreader damage prevention function |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4316344Y1 (en) * | 1965-07-23 | 1968-07-08 | ||
| JPS5139856A (en) * | 1974-09-30 | 1976-04-03 | Komatsu Mfg Co Ltd | Fuookurifuto no fuookuseigyosochi |
-
1977
- 1977-09-26 JP JP11464877A patent/JPS5449752A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4316344Y1 (en) * | 1965-07-23 | 1968-07-08 | ||
| JPS5139856A (en) * | 1974-09-30 | 1976-04-03 | Komatsu Mfg Co Ltd | Fuookurifuto no fuookuseigyosochi |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS626486A (en) * | 1985-07-01 | 1987-01-13 | Nec Corp | Semiconductor memory device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5449752A (en) | 1979-04-19 |
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