JPH0229715B2 - - Google Patents
Info
- Publication number
- JPH0229715B2 JPH0229715B2 JP55024267A JP2426780A JPH0229715B2 JP H0229715 B2 JPH0229715 B2 JP H0229715B2 JP 55024267 A JP55024267 A JP 55024267A JP 2426780 A JP2426780 A JP 2426780A JP H0229715 B2 JPH0229715 B2 JP H0229715B2
- Authority
- JP
- Japan
- Prior art keywords
- main rope
- traction
- squalane
- weight
- fluid
- 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 - Lifetime
Links
- PRAKJMSDJKAYCZ-UHFFFAOYSA-N squalane Chemical compound CC(C)CCCC(C)CCCC(C)CCCCC(C)CCCC(C)CCCC(C)C PRAKJMSDJKAYCZ-UHFFFAOYSA-N 0.000 claims description 21
- JXTPJDDICSTXJX-UHFFFAOYSA-N n-Triacontane Natural products CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC JXTPJDDICSTXJX-UHFFFAOYSA-N 0.000 claims description 10
- 229940032094 squalane Drugs 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- 239000002562 thickening agent Substances 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 4
- -1 acyclic terpene Chemical class 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- LLCSWKVOHICRDD-UHFFFAOYSA-N buta-1,3-diyne Chemical group C#CC#C LLCSWKVOHICRDD-UHFFFAOYSA-N 0.000 description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- YYGNTYWPHWGJRM-UHFFFAOYSA-N (6E,10E,14E,18E)-2,6,10,15,19,23-hexamethyltetracosa-2,6,10,14,18,22-hexaene Chemical compound CC(C)=CCCC(C)=CCCC(C)=CCCC=C(C)CCC=C(C)CCC=C(C)C YYGNTYWPHWGJRM-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- BHEOSNUKNHRBNM-UHFFFAOYSA-N Tetramethylsqualene Natural products CC(=C)C(C)CCC(=C)C(C)CCC(C)=CCCC=C(C)CCC(C)C(=C)CCC(C)C(C)=C BHEOSNUKNHRBNM-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000002199 base oil Substances 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- HNZUNIKWNYHEJJ-FMIVXFBMSA-N geranyl acetone Chemical compound CC(C)=CCC\C(C)=C\CCC(C)=O HNZUNIKWNYHEJJ-FMIVXFBMSA-N 0.000 description 1
- HNZUNIKWNYHEJJ-UHFFFAOYSA-N geranyl acetone Natural products CC(C)=CCCC(C)=CCCC(C)=O HNZUNIKWNYHEJJ-UHFFFAOYSA-N 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 125000005487 naphthalate group Chemical group 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 239000010686 shark liver oil Substances 0.000 description 1
- 229940069764 shark liver oil Drugs 0.000 description 1
- 229940031439 squalene Drugs 0.000 description 1
- TUHBEKDERLKLEC-UHFFFAOYSA-N squalene Natural products CC(=CCCC(=CCCC(=CCCC=C(/C)CCC=C(/C)CC=C(C)C)C)C)C TUHBEKDERLKLEC-UHFFFAOYSA-N 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
- D07B1/141—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising liquid, pasty or powder agents, e.g. lubricants or anti-corrosive oils or greases
- D07B1/144—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising liquid, pasty or powder agents, e.g. lubricants or anti-corrosive oils or greases for cables or cable components built-up from metal wires
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2007—Elevators
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Pulleys (AREA)
- Lubricants (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
Description
この発明は金属性の駆動綱車とこれに巻き掛け
られた主索とを有するトラクシヨン式エレベータ
装置の主索に塗布されるトラクシヨン式エレベー
タ装置用流体に関するものである。
まず、第1、第2図によつてトラクシヨン式エ
レベータのトラクシヨンを説明する。
図中、1はエレベータ巻上機(図示しない)の
駆動綱車で、1aはこれの溝、2はそらせ車、3
は駆動綱車1及びそらせ車2に巻き掛けられた主
索で、4はこれらの一端に吊持されたかご、5は
他端に吊持されたつり合おもりである。
すなわち、溝1a、主索3相互の摩擦により主
索3を介してかご4等が駆動される。そして主索
3の滑り限界張力比は次の式であらわされる。
T1/T2=eK〓〓 …
ここに
T1…かご4側の主索3の張力
T2…つり合おもり5側の主索3の張力
μ…溝1a、主索3間の摩擦係数
K…溝1aの形状による係数
K=4(sinγ/2−sinα/2)/γ−α+si
nγ−sinα
α…溝1aのアンダーカツト角
γ…溝1aに対する主索3の接触角
θ…駆動綱車1に対す主索3の巻付角
なお、張力比T1/T2はエレベータの加減速
時、負荷条件によつて変化して、全負荷上昇、又
は無負荷下降時の最大加速時に最大となる。
例えばW1…かご4の重量
W…最大積載重量
W2…つり合おもり5の重量
W2=W1+W/2
αg…最大加速度
として主索3等の重量を無視した系を考えると
全負荷上昇加速時
T1/T2=(W1+W)(1+α)/W2(1−α)
=(1+W/2W1+W)(1+α/1−α) …
無負荷下降加速時
T2/T1=W2(1+α)/W1(1−α)=(1+W/2W1
)(1+α/1−α)
…
で与えられる。これら、式の張力比が式の
eK〓〓を越えないようにする必要がある。
しかし、省資材、製造費節減のためにかご4の
自重が軽量化されると、、式の張力比が大き
くなる。また、省資材、製造費節減のために巻上
機が小形化させて駆動綱車1の直径を小さくする
と、角度θが小さくなる。さらにトラクシヨンの
安全性、信頼性を増すために主索3、駆動綱車1
の耐久性を向上を図り、角度αを小さくし可能な
らば角度αを0゜、すなわち溝1aをU溝にするこ
とが必要となる。このため大きい張力比に対して
係数K、角度θが小さくなり式のeK〓〓が小さく
なることになつて、所要のトラクシヨンが得られ
なくなることが考えられる。
この発明は上記の欠点を解消するもので、駆動
綱車に対する主索の巻付角が小さく、また駆動綱
車の溝がU溝からなるものであつても所要のトラ
クシヨン作用を得ることができるトラクシヨン式
エレベータ装置用流体を提供しようとするもので
ある。
以下、この発明の一実施例を説明する。
式のeK〓〓を大きくするため摩擦係数μを大き
くする主索3用の潤滑油の一つにスクアランを含
むものがあり発明者の実験によれば次表の結果が
得られた。
The present invention relates to a fluid for a traction type elevator system that is applied to the main rope of a traction type elevator system having a metallic drive sheave and a main rope wound around the sheave. First, the traction of a traction type elevator will be explained with reference to FIGS. 1 and 2. In the figure, 1 is a driving sheave of an elevator hoisting machine (not shown), 1a is a groove thereof, 2 is a deflection wheel, and 3
is a main rope wrapped around the drive sheave 1 and deflection sheave 2; 4 is a cage suspended from one end of these; 5 is a counterweight suspended from the other end. That is, the car 4 and the like are driven via the main rope 3 due to mutual friction between the groove 1a and the main rope 3. The slip limit tension ratio of the main rope 3 is expressed by the following formula. T1/T2=e K 〓〓 …Here T1…Tension of the main rope 3 on the car 4 side T2…Tension of the main rope 3 on the counterweight 5 side μ…Coefficient of friction between the groove 1a and the main rope 3 K…Groove Coefficient due to the shape of 1a K=4 (sinγ/2-sinα/2)/γ-α+si
nγ−sinα α...Undercut angle of groove 1a γ...Contact angle of main rope 3 with groove 1a θ...Wrapping angle of main rope 3 with respect to drive sheave 1 Note that the tension ratio T1/T2 is during acceleration and deceleration of the elevator , varies depending on the load conditions and reaches its maximum at full load rise or maximum acceleration during no load fall. For example, W1...Weight of car 4 W...Maximum loaded weight W2...Weight of counterweight 5 W2=W1+W/2 αg...If we consider a system in which the weight of main rope 3, etc. is ignored as the maximum acceleration, at full load rising acceleration T1/ T2=(W1+W)(1+α)/W2(1-α) =(1+W/2W1+W)(1+α/1-α)... During no-load downward acceleration T2/T1=W2(1+α)/W1(1-α)= (1+W/2W1
)(1+α/1-α)... is given by. These, the tension ratio of the equation is
It is necessary to avoid exceeding e K 〓〓. However, if the weight of the car 4 is reduced in order to save materials and reduce manufacturing costs, the tension ratio in the equation increases. Furthermore, when the hoist is downsized and the diameter of the drive sheave 1 is reduced in order to save materials and manufacturing costs, the angle θ becomes smaller. Furthermore, in order to increase the safety and reliability of traction, three main ropes and one driving sheave are installed.
In order to improve the durability of the groove, it is necessary to reduce the angle α, and if possible, make the angle α 0°, that is, make the groove 1a a U-groove. For this reason, for a large tension ratio, the coefficient K and the angle θ become small, and the equation e K 〓 becomes small, and it is conceivable that the required traction cannot be obtained. This invention solves the above-mentioned drawbacks, and even if the winding angle of the main rope around the driving sheave is small and the groove of the driving sheave is a U-groove, the required traction action can be obtained. It is an object of the present invention to provide a fluid for traction type elevator equipment. An embodiment of this invention will be described below. In order to increase the coefficient of friction μ in order to increase the equation e K 〓〓, one of the lubricating oils for the main rope 3 contains squalane, and according to the inventor's experiments, the results shown in the following table were obtained.
【表】【table】
【表】
すなわち、スクアランは天然のものと合成され
たものとがあり、C30H62の炭化水素油でC5H8イ
ソプレンの6量体オリゴマである。前者はさめ肝
油に含まれるものでスクアレンC30H50(非環式テ
ルペン)を水添したものであり、後者はイソプレ
ンから合成されたゲラニルアセトンを原料とし、
ジアセチレンでエチニル化してジアセチレンジオ
ールを作り、これを水添脱水したものものであ
る。そしてスクアランを含む主索3用潤滑油はμ
値が0.12前後と高く角度θが小さく、係数Kが小
さく、すなわち溝1aがU溝であつても所要のト
ラクシヨンを得ることができる。さらにこの潤滑
油は蒸発量が少なく引火点が高いため、エレベー
タ保守周期を長くすることができ、また安全であ
り簡易に保守することができて費用を節減するこ
とができる。なお適宜な流動性、防錆性を得るた
めに周知の増稠剤、添加剤を加えても所要の摩擦
係数μ値が得られる。例えばスクアランを基油と
し、増稠剤としては高融点の天然又は合成炭化水
素ロウ5〜25重量%を加えたもの、すなわち実験
例C、また、増粘剤としてポリメタアクレートエ
ステルやポリブテン、イソプレン等、防錆剤とし
て有機スルフオン酸金属塩やアミン類、油性向上
剤としてZn−ジアルキルジチオフエスフエト類
やナフテレ酸金属塩類等を1〜10重量%加えたも
の、すなわち実験例Dである。そして実験例Bの
液状タイプのものを主索3製作時の麻綱含浸用
に、実験例Cの軟固体状タイプのものを主索3の
ストランド用に、また実施例Dの液状タイプのも
のを張設後の主索3に対する補給用に使用すると
それぞれの作業時に取扱い上便利である。また摩
擦係数μ値が高いが蒸発量の多いシクロヘキシル
環を含有する炭化水素、例えばジシクロヘキシル
2メチルペンタンにスクアランを混合すると上記
μ値を低下させず、実施例E及びFのように上記
炭化水素の蒸発量を算術平均的に低下させること
ができる。
なお、上表の比較例Gの潤滑油、すなわち、シ
クロヘキシル環を2個置換した飽和炭化水素
(C1〜C10)及びアルキルシクロアルカン(アル
キル基C1〜C18、アルカンC3〜C18)からなるも
のは、μ値0.13が得られるが蒸発量が大きく、主
索等の発錆を防ぐため保守頻度が高くなり、トラ
クシヨン維持のために煩雑な手数を要する不具合
がある。
以上説明したとおりこの発明は、主索と上記駆
動綱車との間の摩擦係数を少なくとも0.1とし、
かつ蒸発量を105℃、8時間において重量1%以
下とした軟固体状のトラクシヨン式エレベータ装
置用流体であつて、上記流体は、スクアランが75
〜95%重量部、増稠剤が5〜25%重量部で構成さ
れ、上記増稠剤として高融点の天然又は合成炭化
水素ロウを用いたトラクシヨン式エレベータ装置
用流体を主索に塗布するようにしたので、トラク
シヨン系の条件が不利な場合であつても所要のト
ラクシヨンが得られる効果があり、また、この効
果を少ない費用で維持することができるトラクシ
ヨン式エレベータ装置を実現するものである。[Table] In other words, squalane is either natural or synthetic, and is a C 30 H 62 hydrocarbon oil and a C 5 H 8 isoprene hexamer oligomer. The former is contained in shark liver oil and is made by hydrogenating squalene C 30 H 50 (an acyclic terpene), and the latter is made from geranylacetone synthesized from isoprene.
Diacetylene is ethynylated with diacetylene to produce diacetylene diol, which is then hydrogenated and dehydrated. The lubricating oil for main rope 3 containing squalane is μ
The value is as high as around 0.12, the angle θ is small, and the coefficient K is small, that is, even if the groove 1a is a U groove, the required traction can be obtained. Furthermore, since this lubricating oil has a low evaporation amount and a high flash point, it is possible to lengthen elevator maintenance intervals, and it is safe and easy to maintain, resulting in cost savings. In addition, in order to obtain appropriate fluidity and rust prevention properties, the required friction coefficient μ value can be obtained by adding well-known thickeners and additives. For example, squalane is used as a base oil and 5 to 25% by weight of a high melting point natural or synthetic hydrocarbon wax is added as a thickener, that is, Experimental Example C; Isoprene, etc., to which 1 to 10% by weight of organic sulfonic acid metal salts and amines are added as rust preventive agents, and Zn-dialkyl dithiophenes and naphthalate metal salts as oiliness improvers, that is, Experimental Example D. . Then, the liquid type of Experimental Example B was used for impregnating hemp rope when making the main rope 3, the soft solid type of Experimental Example C was used for the strands of the main rope 3, and the liquid type of Example D If used to supply the main rope 3 after it has been stretched, it will be convenient to handle during each work. Furthermore, when squalane is mixed with a hydrocarbon containing a cyclohexyl ring that has a high friction coefficient μ value but a large amount of evaporation, for example, dicyclohexyl dimethylpentane, the μ value does not decrease, and as in Examples E and F, the hydrocarbon The amount of evaporation can be reduced on an arithmetic average basis. In addition, the lubricating oil of Comparative Example G in the above table, that is, one consisting of a saturated hydrocarbon (C1 to C10) with two substituted cyclohexyl rings and an alkylcycloalkane (alkyl group C1 to C18, alkane C3 to C18), Although a μ value of 0.13 can be obtained, the amount of evaporation is large, maintenance is required more frequently to prevent rust on the main rope, etc., and there are disadvantages in that it requires complicated steps to maintain traction. As explained above, this invention sets the friction coefficient between the main rope and the driving sheave to at least 0.1,
A fluid for traction type elevator equipment in the form of a soft solid with an evaporation amount of 1% or less by weight at 105°C for 8 hours, wherein the fluid contains 75% squalane.
The main rope is coated with a fluid for traction type elevator equipment, which is composed of ~95% by weight and a thickener by 5~25% by weight, and uses a natural or synthetic hydrocarbon wax with a high melting point as the thickener. Therefore, even when the conditions of the traction system are unfavorable, the required traction can be obtained, and this effect can be maintained at low cost.
第1図はトラクシヨン式エレベータ装置の模式
図、第2図は第1図の−線断面図である。
1……駆動綱車、3……主索。なお、図中同一
部分または相当部分は同一符号により示す。
FIG. 1 is a schematic diagram of a traction elevator system, and FIG. 2 is a sectional view taken along the line -- in FIG. 1. 1... Drive sheave, 3... Main rope. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals.
Claims (1)
索とを有するトラクシヨン式エレベータ装置の主
索に塗布され、この主索と上記駆動綱車との間の
摩擦係数を少なくとも0.1とし、かつ蒸発量を105
℃、8時間において重量1%以下とした軟固体状
のトラクシヨン式エレベータ装置用流体であつ
て、上記流体は、スクアランが75〜95%重量部、
増稠剤が5〜25%重量部で構成され、上記増稠剤
として高融点の天然又は合成炭化水素ロウを用い
たことを特徴とするトラクシヨン式エレベータ装
置用流体。 2 スクアランが天然スクアラン又は合成スクア
ランを含むものからなるものとしたことを特徴と
する特許請求の範囲第1項記載のトラクシヨン式
エレベータ装置用流体。[Scope of Claims] 1. Coated on the main rope of a traction elevator system having a metallic driving sheave and a main rope wound around the metal driving sheave, the coefficient of friction between the main rope and the driving sheave. is at least 0.1 and the evaporation amount is 105
A fluid for traction type elevator equipment in the form of a soft solid having a weight of 1% or less at 8 hours at ℃, the fluid contains squalane in an amount of 75 to 95% by weight,
A fluid for traction type elevator equipment, characterized in that the thickener is comprised in an amount of 5 to 25% by weight, and a natural or synthetic hydrocarbon wax with a high melting point is used as the thickener. 2. The fluid for a traction-type elevator device according to claim 1, wherein the squalane contains natural squalane or synthetic squalane.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2426780A JPS56120798A (en) | 1980-02-28 | 1980-02-28 | Traction elevator apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2426780A JPS56120798A (en) | 1980-02-28 | 1980-02-28 | Traction elevator apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56120798A JPS56120798A (en) | 1981-09-22 |
JPH0229715B2 true JPH0229715B2 (en) | 1990-07-02 |
Family
ID=12133445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2426780A Granted JPS56120798A (en) | 1980-02-28 | 1980-02-28 | Traction elevator apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56120798A (en) |
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CN103771253A (en) * | 2013-12-19 | 2014-05-07 | 柳州正菱集团有限公司 | Portable hoisting tool |
CN103771255A (en) * | 2013-12-19 | 2014-05-07 | 柳州正菱集团有限公司 | Lifting device for installing machine tool |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006274037A (en) * | 2005-03-29 | 2006-10-12 | Hitachi Ltd | Lubricating oil for use in wire rope, wire rope, and rope-type elevator apparatus |
JP6334377B2 (en) * | 2014-12-03 | 2018-05-30 | 株式会社日立製作所 | Elevator rope oil, grease for elevator rope, elevator rope and traction type elevator |
JP6717593B2 (en) * | 2015-12-10 | 2020-07-01 | 株式会社日立製作所 | Grease for elevator rope, elevator rope and traction elevator |
CN109835797A (en) * | 2019-04-01 | 2019-06-04 | 杭州德睿轩科技有限公司 | A kind of elevator lifting piece |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52124577A (en) * | 1976-04-10 | 1977-10-19 | Toshiba Corp | Preparation for squalene system grease |
JPS52132268A (en) * | 1976-04-28 | 1977-11-05 | Toshiba Corp | Lubricating oil composition |
-
1980
- 1980-02-28 JP JP2426780A patent/JPS56120798A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52124577A (en) * | 1976-04-10 | 1977-10-19 | Toshiba Corp | Preparation for squalene system grease |
JPS52132268A (en) * | 1976-04-28 | 1977-11-05 | Toshiba Corp | Lubricating oil composition |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103738826A (en) * | 2013-12-19 | 2014-04-23 | 柳州正菱集团有限公司 | Lifting tool |
CN103771253A (en) * | 2013-12-19 | 2014-05-07 | 柳州正菱集团有限公司 | Portable hoisting tool |
CN103771255A (en) * | 2013-12-19 | 2014-05-07 | 柳州正菱集团有限公司 | Lifting device for installing machine tool |
Also Published As
Publication number | Publication date |
---|---|
JPS56120798A (en) | 1981-09-22 |
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