EP0257127A1 - Elektrisch betriebener Kettenflaschenzug - Google Patents

Elektrisch betriebener Kettenflaschenzug Download PDF

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Publication number
EP0257127A1
EP0257127A1 EP19860111792 EP86111792A EP0257127A1 EP 0257127 A1 EP0257127 A1 EP 0257127A1 EP 19860111792 EP19860111792 EP 19860111792 EP 86111792 A EP86111792 A EP 86111792A EP 0257127 A1 EP0257127 A1 EP 0257127A1
Authority
EP
European Patent Office
Prior art keywords
shaft
intermediate shaft
cam
support
chain block
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
Application number
EP19860111792
Other languages
English (en)
French (fr)
Other versions
EP0257127B1 (de
Inventor
Takayoshi Nakamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kito KK
Original Assignee
Kito KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE19863606039 priority Critical patent/DE3606039A1/de
Application filed by Kito KK filed Critical Kito KK
Priority to EP19860111792 priority patent/EP0257127B1/de
Publication of EP0257127A1 publication Critical patent/EP0257127A1/de
Application granted granted Critical
Publication of EP0257127B1 publication Critical patent/EP0257127B1/de
Expired legal-status Critical Current

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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
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/12—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect
    • B66D5/14—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect embodying discs

Definitions

  • This invention relates to an electric chain block having a torque limiter and a mechanical brake in a reduction gear assembly.
  • An electric chain block having a torque limiter and a mechanical brake has been known as disclosed Japanese Patent Application Publication No. 38,378/79.
  • a driving shaft connected to a rotating shaft of an electric motor is integrally formed with a driving gear, and a hollow driven shaft having a load sheave thereon is rotatably fitted on the driving shaft.
  • a torque limiter having an annular driven gear and a mechanical brake are arranged in series side by side on the hollow driven shaft.
  • An intermediate driven shaft is located in parallel with the driving shaft and is provided thereon with an intermediate driven gear and an intermediate drive gear which are in mesh with the driving gear and the annular driven gear, respectively.
  • this electric chain block however, the torque limiter cannot be adjusted to change its trans­mitting torque from outside of the chain block after it has been assembled. Moreover, this chain block has a disadvantage of the unavoidably unduely long driving shaft which makes bulky the chain block.
  • an electric chain block including a reduction gear assembly having a torque limiter and a mechanical brake has been disclosed in Japanese Patent Application Publication No. 42,937/78.
  • an intermediate shaft and a brake restraining member must be worked to form screw threads with high accuracy, which would increase cost of manufacturing.
  • transmission torque of the torque limiter cannot be adjusted from outside of a gear box after assembling.
  • the cam support is formed integrally with the intermediate driven gear.
  • the load sheave may be formed integrally with the intermediate shaft.
  • Figs. 1-5 illustrate a first embodiment of the invention.
  • One end of a driving shaft 3 is connected through a coupling to a rotating shaft 2 of an electric motor 1.
  • the other end of the driving shaft 3 is journaled by a bearing in a gear box 21 and is formed with a driving gear 4 having a small diameter.
  • a hollow driven shaft 6 is rotatably fitted on the driving shaft 3 between the driving gear 4 and the coupling and is integrally formed with a load sheave 5 for winding a load chain (not shown) thereabout.
  • a driven gear 7 having a large diameter is fixed to an end of the hollow driven shaft on the side of the driving gear 4.
  • An intermediate shaft 10 made of steel is journaled by bearings 22 and 23 in the gear box 21 in parallel with the driving gear 4 of the driving shaft 3.
  • the intermediate shaft 10 is formed at its one end with an intermediate pinion 9 adapted to be in mesh with the driven gear 7.
  • a support ring 24 (Fig. 2) made of a steel is fitted on the intermediate shaft 10 so as to engage one end of the intermediate driving gear 9 and is further fitted on a center hole of a support member 11 in the form of a dish-shaped spring made of a spring steel.
  • an urging ring 25 made of a steel is fitted on the other end of the intermediate shaft 10 so as to engage the bearing 23 and further fitted in a center hole of an urging member 12 in the form of a dish-shaped spring made of a spring steel.
  • a cam support 13 made of a steel is rotatably and axially slidably fitted on a mid-portion of the intermediate shaft 10 between the support member 11 and the urging member 12.
  • a retainer disc 14 made of a steel between the cam support 13 and the urging member 12 is fitted on the intermediate shaft 10 axially slidably but nonrotatably relative thereto.
  • a brake receiving disc 15 between the cam support 13 and the support member 11 is also fitted on the intermediate shaft 10 axially slidably but nonrotatably relative thereto.
  • a ratchet wheel 17 for braking is rotatably fitted on a boss of the brake receiving disc 15 through a sleeve bearing 26.
  • a pawl 16 for braking (Fig. 1) is pivotally mounted on the gear box and is urged into engagement with the ratchet wheel 17 by means of a spring (not shown).
  • An intermediate driven gear 8 is fitted on an outer circumference of the cam support 13 axially slidably but against rotation relative thereto.
  • Friction plates 27 and 28 are fixed to side surfaces of the intermediate driven gear 8, respectively, by means of welding, adhesive or the like.
  • a friction plate 29 (Fig. 2) between the ratchet wheel 17 and a flange of the brake receiving disc 15 is fixed to a side surface of the ratchet wheel 17 by means of adhesive.
  • the cam support 13 is formed on a side of the brake receiving disc 15 with a plurality of cam grooves 18 in the form of arcs circumferentially spaced apart from each other and concentric to the intermediate shaft 10 as shown in Fig. 3.
  • Each the cam groove 18 has a sloped bottom to change the depth of the groove and receives a brake releasing cam member 19 in the form of a steel ball in this embodiment.
  • the cam support 13 is formed on a side of the retainer disc 14 with a plurality of recess 30 circumferentially spaced apart from each other in a circle concentric to the intermediate shaft 10 for receiving steel balls 31.
  • An urging collar 32 made of steel is fitted on the other end of the intermediate shaft 10 and has one end adapted to engage the bearing 23.
  • An oil sealing ring 33 is arranged between the collar 32 and a wall of the gear box 21 accommodating the bearing 23.
  • An O-ring 34 is fitted in an annular groove formed in the intermediate shaft 10 inside the collar 32.
  • An external screw-thread portion 35 provided on the other end of the intermediate shaft 10 extends outwardly from the gear box 21.
  • An adjusting nut 20 is threadedly engaged with the external screw-thread portion 35 of the intermediate shaft 10 out of the gear-box 21 and at the same time engages the other end of the collar 32.
  • a tightening force of the adjusting nut 20 urges the central portion of the urging member 12 through the collar 32, the bearing 23 and the urging ring 25 to clamp the retainer disc 14, the intermediate driven gear 8, the ratchet wheel 17, the flange of the brake receiving disc 15 and the friction plates 27, 28 and 29 interposed therebetween with the aid of the support member 11 and the urging member 12.
  • a torque limiter is constructed by the urging member 12 and the support member 11 and the intermediate driven gear 8, the retainer disc 14, the brake receiving disc 15, the ratchet wheel 17, and the friction plates 27, 28 and 29 between the members 12 and 11.
  • a mechanical brake assembly for preventing load from dropping is formed by the ratchet wheel 17 held through the retainer disc 14, the brake receiving disc 15, the intermediate driven gear 8 and the friction plates by the spring forces of the support member 11 and the urging member 12; the pawl 16 adapted to engage the ratchet wheel 17; the cam support 13 having cam grooves 18; and the brake releasing cam members 19.
  • the rotation of the intermediate driven gear 8 is transmitted through the retainer disc 14 and the brake receiving disc 15 to the intermediate shaft 10 and then through the intermediate driving gear 9, the driven gear 7 and the intermediate driven shaft 6 to the load sheave 5, thereby effecting the winding-up operation within the torque set by the torque limiter.
  • Fig. 6 illustrates a second embodiment of the invention.
  • This chain block is substantially identical with that of the first embodiment with exception that a cam support 13 is formed integrally with an intermediate driven gear 8 and does not have recesses 30 and steel balls 31.
  • Fig. 7 illustrates a third embodiment of the invention, whose chain block is substantially similar to that of the first embodiment with exception that an intermediate shaft 10 is formed integrally with a load sheave 5 to eliminate the hollow driven shaft 6, the driven gear 7 and the intermediate driving gear 9.
  • only either one of the support member 11 and the urging member 12 may be formed by a dish-shaped spring made of a spring steel.
  • the retainer disc14 may be arranged between the support member 11 and the intermediate driven gear 8 having the cam support 13 thereinside, and the brake receiving disc 15 and the ratchet wheel 17 may be arranged between the intermediate driven gear 8 and the urging member 12.
  • wedge-shaped shoes having oblique surfaces matching the inclined bottom surfaces of the cam grooves 18 may be used.
  • Springs other than the dish-shaped springs may be used as the support member 11 and the urging member 12.
  • the electric chain block comprises an intermediate shaft 10 arranged in parallel with a driving shaft 3, a cam support 13 provided inside an intermediate driven gear 8, a retainer disc 14 and brake receiving disc 15 fitted with a ratchet wheel 17 fitted on the intermediate shaft 10 between the support member 11 anchored to the intermediate shaft 10 and the urging member 12 fitted on the shaft 10, at least one of the members 11 and 12 being a spring, and brake releasing cam members 19 located in cam grooves 18 provided in the cam support 13.
  • This constitution of the chain block makes simplified a reduction gear mechanism having a torque limiter and a mechanical brake assembly for the electric chain block and makes it easy to manufacture the chain block.
  • an adjusting nut 20 threadedly fitted on the extending end of the intermediate shaft 10 for adjusting the urging force of the urging member 12, so that the transmission torque of the torque limiter can be easily adjusted only by rotating the adjusting nut 20 out of the gear box after the reduction gear mechanism having the torque limiter and the mechanical brake assembly has been assembled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Transmission Devices (AREA)
EP19860111792 1985-02-27 1986-08-26 Elektrisch betriebener Kettenflaschenzug Expired EP0257127B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19863606039 DE3606039A1 (de) 1985-02-27 1986-02-25 Elektrische kettenwindenanordnung
EP19860111792 EP0257127B1 (de) 1986-08-26 1986-08-26 Elektrisch betriebener Kettenflaschenzug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19860111792 EP0257127B1 (de) 1986-08-26 1986-08-26 Elektrisch betriebener Kettenflaschenzug

Publications (2)

Publication Number Publication Date
EP0257127A1 true EP0257127A1 (de) 1988-03-02
EP0257127B1 EP0257127B1 (de) 1989-01-11

Family

ID=8195367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860111792 Expired EP0257127B1 (de) 1985-02-27 1986-08-26 Elektrisch betriebener Kettenflaschenzug

Country Status (1)

Country Link
EP (1) EP0257127B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2222654A (en) * 1988-07-06 1990-03-14 Wheway Becker Ltd Chain block assembly

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2332028B2 (de) * 1973-06-23 1975-09-25 Fa. R. Stahl, 7000 Stuttgart Rutschkupplung für Hebezeuge
DE2448357B2 (de) * 1974-10-10 1976-08-19 Fa. R. Stahl, 7000 Stuttgart Reduziergetriebe fuer antriebe von hebezeugen
DE2917028A1 (de) * 1978-04-26 1979-11-08 Sundstrand Corp Kombinierte einwegbrems- und drehmomentbegrenzer-vorrichtung
DE2849070A1 (de) * 1978-11-11 1980-05-22 Sew Eurodrive Gmbh & Co Kettenzug-antrieb
US4365961A (en) * 1979-12-12 1982-12-28 Hilti Aktiengesellschaft Friction clutch including rolling bodies for transmitting a limited torque
US4496136A (en) * 1982-08-25 1985-01-29 Kabushiki Kaisha Kito Hoist
US4508318A (en) * 1982-08-25 1985-04-02 Kabushiki Kaisha Kito Electric hoist
DE3503342A1 (de) * 1985-02-01 1986-08-14 SEW-EURODRIVE GmbH & Co, 7520 Bruchsal Kettenzug

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2332028B2 (de) * 1973-06-23 1975-09-25 Fa. R. Stahl, 7000 Stuttgart Rutschkupplung für Hebezeuge
DE2448357B2 (de) * 1974-10-10 1976-08-19 Fa. R. Stahl, 7000 Stuttgart Reduziergetriebe fuer antriebe von hebezeugen
DE2917028A1 (de) * 1978-04-26 1979-11-08 Sundstrand Corp Kombinierte einwegbrems- und drehmomentbegrenzer-vorrichtung
DE2849070A1 (de) * 1978-11-11 1980-05-22 Sew Eurodrive Gmbh & Co Kettenzug-antrieb
US4365961A (en) * 1979-12-12 1982-12-28 Hilti Aktiengesellschaft Friction clutch including rolling bodies for transmitting a limited torque
US4496136A (en) * 1982-08-25 1985-01-29 Kabushiki Kaisha Kito Hoist
US4508318A (en) * 1982-08-25 1985-04-02 Kabushiki Kaisha Kito Electric hoist
DE3503342A1 (de) * 1985-02-01 1986-08-14 SEW-EURODRIVE GmbH & Co, 7520 Bruchsal Kettenzug

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2222654A (en) * 1988-07-06 1990-03-14 Wheway Becker Ltd Chain block assembly

Also Published As

Publication number Publication date
EP0257127B1 (de) 1989-01-11

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