EP0101743A1 - Hoist - Google Patents
Hoist Download PDFInfo
- Publication number
- EP0101743A1 EP0101743A1 EP83900736A EP83900736A EP0101743A1 EP 0101743 A1 EP0101743 A1 EP 0101743A1 EP 83900736 A EP83900736 A EP 83900736A EP 83900736 A EP83900736 A EP 83900736A EP 0101743 A1 EP0101743 A1 EP 0101743A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hoist
- drum
- air
- valve
- 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.)
- Granted
Links
- 230000004044 response Effects 0.000 claims description 2
- 210000002445 nipple Anatomy 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D3/00—Portable or mobile lifting or hauling appliances
- B66D3/18—Power-operated hoists
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D3/00—Portable or mobile lifting or hauling appliances
- B66D3/18—Power-operated hoists
- B66D3/24—Applications of limit switches
Definitions
- the present invention relates to a hoist which is used to lift a cargo hanged on a hook, move to a desired position and lower there.
- hoist for example, electric hoist and air hoist, adapted for different purposes.
- These conventional hoists have a common problem. That is, when the hook is lowered to hang the cargo thereon, operation time of the driving source has to be controlled accurately, otherwise the hoisting wire would be rewound on the drum after completely unwound from the drum.
- the operator actuates a switch to lower the hook for unwinding the wire and stops actuation of the switch at an appropriate time to stop lowering of the hook.
- the object of the present invention is to solve the problem involved in the prior art, that is, to provide a hoist which can set the hook at most desirable altitude by controlling the amount of rotation of a drum in unwinding direction.
- the hoist of the present invention is provided with means for reading the amount of rotation of the drum in the unwinding or backward direction, and means for stopping the driving source in response to a signal from said reading means.
- FIGs. 1, 2 and 3 the main body of an air hoist is generally designated by 10.
- a wire-rope 1 extends upwardly from the main body 10.
- a hanger or hook 2 is fixed to the lower end of the main body.
- the loop portion 3 is connected with the lower end of a swivel holder 5 the upper end of which is connected with a swivel 4.
- Horizontally mounted on the holder 5 is a nipple 6 with an elbow 7 at one end and a cap 8 at the other end.
- a spirally coiled vinyl tube 9 is disposed between the nipple 6 and the loop portion 3.
- the hoist main body 10 has a rope entrance opening around which there are provided a damper spring 11, a rope guide 12, damper rubber 13, rope stoppers 14, 15 etc.
- the hanger 2 has a check plate 16 disposed to close the open mouth of the hook.
- the check plate 16 is rotatable about a pin 17 and is normally biased by a spring 18 which intends to rotate the check plate 16 clockwise (as viewed in the drawing of Fig. 2).
- the main body 10 is composed of a pair of casing members 21 and 22.
- an air motor 50 In the space defined by the ' casing members 21 and 22 there are provided an air motor 50, a drum 70, a brake unit 60, a planet gear mechanism 80 etc. of which a further detailed description will be made later.
- valve shafts 23 and 24 On one side of the main body 10 (on the right-hand side as viewed in Fig. 1) there are mounted two valve shafts 23 and 24 horizontally movable and spaced from each other, and also a valve 26 which is vertically movable.
- the valve shafts 23 and 24 are received in a valve cylinder 27 whereas the valve shaft 26 is received in a valve cylinder 28.
- the valve cylinder 27 is secured to the valve cylinder 28 which in turn is secured to a motor cover 41 described later.
- the valve shaft 23 is biased by a valve spring 31 in one direction (rightward as viewed in Fig. 2). This is the same for the valve shaft 24.
- An air-feeding pipe line 32 is connected to the valve cylinder 27.
- Pipe lines 34 and 36 are connected to the valve cylinders 27 and 28 respectively.
- the motor covers 41, 42 and the other casing member 21 support a rotary shaft 47 through ball bearings 43, 44 and 46.
- the aforementioned air motor 50, brake unit 60 and planet gear mechanism 80 are mounted on the rotary shaft 47 .
- the air motor 50 is between the motor covers 41 and 42 and has a rotor 51 and vanes 52. By the force of air supplied through the valve cylinders 27 and 28, the rotor 51 is rotated to rotate the rotary shaft 47.
- the brake unit 60 comprises a brake cone 61 and brake ring 62 mounted on the rotary shaft 47, and a brake cylinder 63 and a brake piston 64 on the brake cone 61.
- the brake cylinder 63 and the motor cover 42 are united together with a communication bore and a valve therebetween.
- the brake cone 61 is biased leftwards (as viewed in Fig. 1) by a spring (not shown). Further, a spring 66 is disposed between the brake cone 61 and the brake ring 62 with the biasing force intending to move the cone and ring away from each other.
- a conical friction surface 67 is formed on the brake cone 61.
- a hoisting drum 70 is composed of a pair of drum members 71 and 72 with a slit-like space 74 therebetween.
- the base end of the rope is connected with the drum 70 by a lock member 73. With the rotation of the drum 70, the hoisting rope 1 is taken up in the space 74 around the drum.
- the rotary shaft 47 has a gear portion 81 formed at one end thereof (at the left-hand end as viewed in Fig. 2).
- a planet gear 84 is in mesh with the gear portion 81 of the rotary shaft 47.
- the planet gear 84 is rotatable about a shaft 83 supported by a gear disc 82 which, in turn, is rotatably supported on the rotary shaft 47.
- the internal gears 86 and 87 are different in the number of teeth from each other.
- the internal gear 86 is fixed to the one casing member 21.
- the drum 70 On the one casing member 21 and at the portion near the outer circumference of the drum 70 there is mounted an index wheel 91 by a bolt 93 through a lining 92.
- the index wheel 91 is mounted for rotation.
- the drum 70 has a stud pin 94 engageable with these teeth and projection.
- valve shaft 103 Above the index wheel 91 and disposed within valve case 101 and valve seat 102 is a valve shaft 103 which is downward biased by a spring 104.
- the shaft 103 is engageable with the projection 91b of the index wheel 91.
- the shaft 103 When the shaft 103 is engaged with the projection 91b of the wheel 91, the shaft 103 is elevated and the air fed through the pipe line 106 is allowed to be discharged through the pipe line 107.
- the valve shaft 103 is not engageable with the remaining portion of the wheel 91, and therefore when the shaft 103 is opposed to the remaining portion of the wheel 91, the shaft 103 is in its lowered position by the spring 104 to disconnect between the pipe lines 106 and 107.
- FIG. 4 the arrangement described above is diagrammatically shown as a pneumatic pressure circuit.
- like reference numerals represent the same or corresponding members.
- a portion of the compressed air supplied to the elbow 32 is branched into the air cylinder 35 (which corresponds to the cylinder 28 shown in Fig. 1).
- the shaft 26 is moved to change over the cylinder 35 from II to I.
- an air cylinder 30 (which corresponds to a lower half of the cylinder 27 shown in Fig. 1) remains in the position II because the shaft 24 is in the position moved rightward in Fig. 2. Consequently, the air is allowed to come out from the pipe line 36 of the air cylinders 30, 27 after passing through the air cylinder 35, 28.
- the stud pin 94 on the drum comes into engagement with one of the teeth 91a of the index wheel 91 at every rotation.
- the index wheel 91 is rotated counter-clockwise (as viewed in Fig. 4) a determined rotational angle per drum rotation.
- the pipe lines 36 and 106 are in communication to each other, the exhaust air from the air cylinder 30 (lower portion of 27) is allowed to enter the air cylinder 40.
- the shaft 103 is in its lowered-position under the action of the spring 104 (the air cylinder 40 is in the position II), and therefore, the air can not pass through the cylinder 40 at this time.
- the operator operates the lever 116 for the air cylinder 30.
- the cylinder 30 is changed over from II to I.
- the compressed air is introduced into the air motor 50 through the air cylinder 35 which is in the position I at that time.
- the motor starts to rotate in the direction opposite to the above, and the rope 1 is unwound from the drum 70 rotating in the opposite direction.
- the hoist main body 10 begins to move downwardly.
- the index wheel 91 is rotated stepwise in the same manner as above but in the opposite direction to above (clockwise as viewed in Fig. 4).
- the index wheel 91 is rotated together with the drum 70 but with a predetermined reduction ratio.
- its projection 91b changes over the air cylinder 40 to change over the air cylinder 35 for stopping the motor 50. Therefore, it is no longer necessary for the operator to delicately control the lowering time of the hoist or hook.
- the problem involved in the prior art hoists such as overshooting is completely solved by the present invention.
- the brake unit 60 operates in the following manner:
- the hook is automatically and always correctly set to the desired lowest position. It is not required for the operator to delicately control the position of the hook in lowering it. Therefore, any unskilled operators can operate the hoist without danger and time loss. A substantial speed- up of the work is attained as compared with the prior art ones.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control And Safety Of Cranes (AREA)
- Unwinding Of Filamentary Materials (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
Description
- The present invention relates to a hoist which is used to lift a cargo hanged on a hook, move to a desired position and lower there.
- There are known various types of hoist, for example, electric hoist and air hoist, adapted for different purposes. These conventional hoists have a common problem. That is, when the hook is lowered to hang the cargo thereon, operation time of the driving source has to be controlled accurately, otherwise the hoisting wire would be rewound on the drum after completely unwound from the drum. Conventionally, the operator actuates a switch to lower the hook for unwinding the wire and stops actuation of the switch at an appropriate time to stop lowering of the hook.
- However, it is not easy without a great deal of experience to judge correctly as to what extent or length the wire is unwound corresponds to the lowest position of the hook. In practice therefore, almost all of the operators have to lower the hook step by step, but this leads to considerable time-consuming. For this reason, a hoist which can easily control altitude of a hook, has been a long-felt want.
- The object of the present invention is to solve the problem involved in the prior art, that is, to provide a hoist which can set the hook at most desirable altitude by controlling the amount of rotation of a drum in unwinding direction. To attain the abovementioned object, the hoist of the present invention is provided with means for reading the amount of rotation of the drum in the unwinding or backward direction, and means for stopping the driving source in response to a signal from said reading means.
-
- Fig. 1 is a cross-sectional view showing an embodiment of the invention where the present invention is applied to an air hoist (the upper part of the hoist is omitted);
- Fig. 2 is a side view thereof partially cross- sectioned (partly omitted);
- Fig. 3 is a similar side view showing the partly omitted from Fig. 1;
- Fig. 4 is a pneumatic pressure circuit diagram of the embodiment; and
- Fig. 5 is a detailed view of the index geared wheel (91) used in the embodiment.
- An embodiment of the present invention will be explained with reference to the drawings. Referring to Figs. 1, 2 and 3 the main body of an air hoist is generally designated by 10. A wire-rope 1 extends upwardly from the
main body 10. A hanger orhook 2 is fixed to the lower end of the main body. As shown in Fig. 3, the loop portion 3 is connected with the lower end of aswivel holder 5 the upper end of which is connected with a swivel 4. Horizontally mounted on theholder 5 is a nipple 6 with anelbow 7 at one end and a cap 8 at the other end. A spirally coiled vinyl tube 9 is disposed between the nipple 6 and the loop portion 3. - As seen best from Fig. 2, the hoist
main body 10 has a rope entrance opening around which there are provided a damper spring 11, arope guide 12,damper rubber 13,rope stoppers hanger 2 has acheck plate 16 disposed to close the open mouth of the hook. Thecheck plate 16 is rotatable about apin 17 and is normally biased by aspring 18 which intends to rotate thecheck plate 16 clockwise (as viewed in the drawing of Fig. 2). - On the whole, the
main body 10 is composed of a pair ofcasing members casing members air motor 50, adrum 70, a brake unit 60, aplanet gear mechanism 80 etc. of which a further detailed description will be made later. - On one side of the main body 10 (on the right-hand side as viewed in Fig. 1) there are mounted two
valve shafts valve 26 which is vertically movable. Thevalve shafts valve cylinder 27 whereas thevalve shaft 26 is received in avalve cylinder 28. Thevalve cylinder 27 is secured to thevalve cylinder 28 which in turn is secured to amotor cover 41 described later. Thevalve shaft 23 is biased by avalve spring 31 in one direction (rightward as viewed in Fig. 2). This is the same for thevalve shaft 24. An air-feeding pipe line 32 is connected to thevalve cylinder 27.Pipe lines valve cylinders - The motor covers 41, 42 and the
other casing member 21 support arotary shaft 47 throughball bearings rotary shaft 47 theaforementioned air motor 50, brake unit 60 andplanet gear mechanism 80 are mounted. Theair motor 50 is between the motor covers 41 and 42 and has a rotor 51 andvanes 52. By the force of air supplied through thevalve cylinders rotary shaft 47. - The brake unit 60 comprises a brake cone 61 and
brake ring 62 mounted on therotary shaft 47, and abrake cylinder 63 and abrake piston 64 on the brake cone 61. Thebrake cylinder 63 and themotor cover 42 are united together with a communication bore and a valve therebetween. The brake cone 61 is biased leftwards (as viewed in Fig. 1) by a spring (not shown). Further, aspring 66 is disposed between the brake cone 61 and thebrake ring 62 with the biasing force intending to move the cone and ring away from each other. Aconical friction surface 67 is formed on the brake cone 61. - A hoisting
drum 70 is composed of a pair ofdrum members like space 74 therebetween. The base end of the rope is connected with thedrum 70 by alock member 73. With the rotation of thedrum 70, the hoisting rope 1 is taken up in thespace 74 around the drum. - The
rotary shaft 47 has a gear portion 81 formed at one end thereof (at the left-hand end as viewed in Fig. 2). A planet gear 84 is in mesh with the gear portion 81 of therotary shaft 47. The planet gear 84 is rotatable about ashaft 83 supported by a gear disc 82 which, in turn, is rotatably supported on therotary shaft 47. Also, in mesh with the planet gear 84 there are a pair of internal gears 86 and 87 fixed to onecasing member 21 and onedrum member 71 respectively. The internal gears 86 and 87 are different in the number of teeth from each other. The internal gear 86 is fixed to the onecasing member 21. - On the one
casing member 21 and at the portion near the outer circumference of thedrum 70 there is mounted anindex wheel 91 by a bolt 93 through alining 92. Theindex wheel 91 is mounted for rotation. On theindex wheel 91 there are formed a plural number ofteeth 91a and asingle projection 91b which is higher than theteeth 91a. Thedrum 70 has astud pin 94 engageable with these teeth and projection. - Above the
index wheel 91 and disposed within valve case 101 andvalve seat 102 is avalve shaft 103 which is downward biased by aspring 104. Theshaft 103 is engageable with theprojection 91b of theindex wheel 91. When theshaft 103 is engaged with theprojection 91b of thewheel 91, theshaft 103 is elevated and the air fed through thepipe line 106 is allowed to be discharged through thepipe line 107. Thevalve shaft 103 is not engageable with the remaining portion of thewheel 91, and therefore when theshaft 103 is opposed to the remaining portion of thewheel 91, theshaft 103 is in its lowered position by thespring 104 to disconnect between thepipe lines - In Fig. 4, the arrangement described above is diagrammatically shown as a pneumatic pressure circuit. In all of the Figures 1 to 4, like reference numerals represent the same or corresponding members.
- The manner of operation of the above shown embodiment is as follows:
- After the hoisting rope 1 has been paid out and when the hoist
main body 10 is in its lowered position, the operator hangs a cargo to be hoisted on thehanger 2. - Compressed air is supplied into an air cylinder 25 (which corersponds to an upperhalf of the
cylinder 27 shown in Fig. 1) through the nipple 6, extended vinyl tube 9 and elbow 32 (Fig. 2). Therefore, when the operator operates thelever 112 to move thevalve shaft 23, thecylinder 25 is changed over from II to I (Fig. 4) and air is supplied to themotor 50 from theair source 113. Thus, theair motor 50 and the gear 81 integrally formed therewith are rotated. However since, as previously noted, the gear 86 is fixed to thecase member 21 and the gears 86 and 87 are different from each other in the number of teeth, the gear 86 does not rotate. Only the gear 87 rotates with the reduction ratio. Together with the rotation of the gear 87, the hoistingdrum 70 also rotates to take up the rope 1 around the drum. Themain body 10 moves upwardly. - A portion of the compressed air supplied to the
elbow 32 is branched into the air cylinder 35 (which corresponds to thecylinder 28 shown in Fig. 1). By the pilot pressure theshaft 26 is moved to change over thecylinder 35 from II to I. At this time, an air cylinder 30 (which corresponds to a lower half of thecylinder 27 shown in Fig. 1) remains in the position II because theshaft 24 is in the position moved rightward in Fig. 2. Consequently, the air is allowed to come out from thepipe line 36 of theair cylinders air cylinder - During the rotation of the
drum 70, thestud pin 94 on the drum comes into engagement with one of theteeth 91a of theindex wheel 91 at every rotation. Thereby theindex wheel 91 is rotated counter-clockwise (as viewed in Fig. 4) a determined rotational angle per drum rotation. Since thepipe lines air cylinder 40. However, theshaft 103 is in its lowered-position under the action of the spring 104 (theair cylinder 40 is in the position II), and therefore, the air can not pass through thecylinder 40 at this time. - When the winding operation comes near the end, the operator stops operating the
lever 112. Thereby theair cylinder 25 is changed over to II to stop the air supply to themotor 50. Thus, the motor stops at this time point. - To start the operation for lowering the hoist, the operator operates the
lever 116 for theair cylinder 30. By this lever operation, thecylinder 30 is changed over from II to I. Now the compressed air is introduced into theair motor 50 through theair cylinder 35 which is in the position I at that time. The motor starts to rotate in the direction opposite to the above, and the rope 1 is unwound from thedrum 70 rotating in the opposite direction. Thus, the hoistmain body 10 begins to move downwardly. During the rotation of the drum in the opposite direction, theindex wheel 91 is rotated stepwise in the same manner as above but in the opposite direction to above (clockwise as viewed in Fig. 4). - When the amount of the rotation of the
index wheel 91 reaches a determined value, theprojection 91b of the wheel comes into contact with thevalve shaft 103 and moves it (pushes the shaft up). Thereby theair cylinder 40 is shifted to I. Now the air is allowed to flow passing through theair cylinder 40. Since thepipe lines air cylinder 40 pushes up thevalve shaft 26 of theair cylinder 35 so that theair cylinder 35 is changed over from I to II to block the flow of air through it. Thus, themotor 50 is stopped automatically to stop lowering the hoist. - In this manner, according to the shown embodiment of invention, the
index wheel 91 is rotated together with thedrum 70 but with a predetermined reduction ratio. When the amount of the rotation of the index wheel reaches a certain determined value, itsprojection 91b changes over theair cylinder 40 to change over theair cylinder 35 for stopping themotor 50. Therefore, it is no longer necessary for the operator to delicately control the lowering time of the hoist or hook. The problem involved in the prior art hoists such as overshooting is completely solved by the present invention. - The brake unit 60 operates in the following manner:
- When the hoist is not operating, the valve cone 61 is in contact with the
brake ring 62 and therefore the brake is effective. During the winding (lifting) operation and the pay-out (lowering) operation, the compressed air passed through theair motor 50 is allowed to enter the brake unit through the air passages and valves. Then, thevalve cylinder 64 and the valve cone 61 are moved together rightward (as viewed in Fig. 1) by the air pressure. As the cone 61 moves away from thebrake ring 62, the braking is released. - While the present invention has been particularly shown and described with reference to an embodiment thereof, it is to be understood that various modifications and changes are possible in the light of the above teachings. For example, the present invnetion is applicable to other types of hoist than air hoist particularly shown in the above, such as electric hoist and hoists of the type in which the main body is stationary and a hoisting rope with a hanger hook at its lower end can be pulled out from the stationary main body.
- According to the invnetion the hook is automatically and always correctly set to the desired lowest position. It is not required for the operator to delicately control the position of the hook in lowering it. Therefore, any unskilled operators can operate the hoist without danger and time loss. A substantial speed- up of the work is attained as compared with the prior art ones.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30501/82 | 1982-03-01 | ||
JP57030501A JPS58148196A (en) | 1982-03-01 | 1982-03-01 | Hoist |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87104798A Division-Into EP0238098B1 (en) | 1982-03-01 | 1983-03-01 | Hoist |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0101743A1 true EP0101743A1 (en) | 1984-03-07 |
EP0101743A4 EP0101743A4 (en) | 1985-11-07 |
EP0101743B1 EP0101743B1 (en) | 1988-06-15 |
Family
ID=12305562
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87104798A Expired EP0238098B1 (en) | 1982-03-01 | 1983-03-01 | Hoist |
EP83900736A Expired EP0101743B1 (en) | 1982-03-01 | 1983-03-01 | Hoist |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87104798A Expired EP0238098B1 (en) | 1982-03-01 | 1983-03-01 | Hoist |
Country Status (6)
Country | Link |
---|---|
EP (2) | EP0238098B1 (en) |
JP (1) | JPS58148196A (en) |
CA (1) | CA1196625A (en) |
DE (2) | DE3382158D1 (en) |
IT (1) | IT1170309B (en) |
WO (1) | WO1983003087A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0238356A2 (en) * | 1986-03-20 | 1987-09-23 | Monyana Engineering Services | Control system for a fluid actuated motor |
CN104386603A (en) * | 2014-12-06 | 2015-03-04 | 无锡高卓流体设备有限公司 | Electrical equipment lifting frame |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5465939A (en) * | 1993-10-22 | 1995-11-14 | Ingersoll-Rand Company | Directional control assembly for an air winch |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1938071A (en) * | 1929-05-18 | 1933-12-05 | American Eng Co Ltd | Control system for hoisting apparatus |
US2407693A (en) * | 1936-12-03 | 1946-09-17 | Vickers Inc | Safety control for hoists and circuit therefor |
US2973412A (en) * | 1957-02-28 | 1961-02-28 | Breeze Corp | Limit control mechanism |
DE2545147A1 (en) * | 1974-10-08 | 1976-04-22 | Eaton Corp | HOIST CONTROL |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3301532A (en) * | 1964-09-23 | 1967-01-31 | Eaton Yale & Towne | Automatic limit control for air hoist |
JPS492739B1 (en) * | 1970-12-25 | 1974-01-22 | ||
JPS492739A (en) * | 1972-04-30 | 1974-01-11 | ||
US3943714A (en) * | 1975-01-23 | 1976-03-16 | The United States Of America As Represented By The Secretary Of The Navy | Fail-safe limit switch stopping system for air motor |
-
1982
- 1982-03-01 JP JP57030501A patent/JPS58148196A/en active Pending
-
1983
- 1983-02-28 CA CA000422530A patent/CA1196625A/en not_active Expired
- 1983-03-01 DE DE8787104798T patent/DE3382158D1/en not_active Expired - Fee Related
- 1983-03-01 EP EP87104798A patent/EP0238098B1/en not_active Expired
- 1983-03-01 EP EP83900736A patent/EP0101743B1/en not_active Expired
- 1983-03-01 IT IT47832/83A patent/IT1170309B/en active
- 1983-03-01 WO PCT/JP1983/000062 patent/WO1983003087A1/en active IP Right Grant
- 1983-03-01 DE DE8383900736T patent/DE3377057D1/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1938071A (en) * | 1929-05-18 | 1933-12-05 | American Eng Co Ltd | Control system for hoisting apparatus |
US2407693A (en) * | 1936-12-03 | 1946-09-17 | Vickers Inc | Safety control for hoists and circuit therefor |
US2973412A (en) * | 1957-02-28 | 1961-02-28 | Breeze Corp | Limit control mechanism |
DE2545147A1 (en) * | 1974-10-08 | 1976-04-22 | Eaton Corp | HOIST CONTROL |
Non-Patent Citations (2)
Title |
---|
JP, Bl,49-2739 (Komatsu Ltd.) 22. January, 1974 (22.1.74) * |
See also references of WO8303087A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0238356A2 (en) * | 1986-03-20 | 1987-09-23 | Monyana Engineering Services | Control system for a fluid actuated motor |
EP0238356A3 (en) * | 1986-03-20 | 1990-01-17 | Monyana Engineering Services | Control system for a fluid actuated motor |
CN104386603A (en) * | 2014-12-06 | 2015-03-04 | 无锡高卓流体设备有限公司 | Electrical equipment lifting frame |
Also Published As
Publication number | Publication date |
---|---|
EP0101743B1 (en) | 1988-06-15 |
DE3382158D1 (en) | 1991-03-14 |
IT8347832A0 (en) | 1983-03-01 |
WO1983003087A1 (en) | 1983-09-15 |
IT1170309B (en) | 1987-06-03 |
EP0101743A4 (en) | 1985-11-07 |
EP0238098B1 (en) | 1991-02-06 |
EP0238098A3 (en) | 1988-01-07 |
DE3377057D1 (en) | 1988-07-21 |
CA1196625A (en) | 1985-11-12 |
JPS58148196A (en) | 1983-09-03 |
EP0238098A2 (en) | 1987-09-23 |
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