EP0131380B1 - Hoist - Google Patents

Hoist Download PDF

Info

Publication number
EP0131380B1
EP0131380B1 EP19840303847 EP84303847A EP0131380B1 EP 0131380 B1 EP0131380 B1 EP 0131380B1 EP 19840303847 EP19840303847 EP 19840303847 EP 84303847 A EP84303847 A EP 84303847A EP 0131380 B1 EP0131380 B1 EP 0131380B1
Authority
EP
European Patent Office
Prior art keywords
drive shaft
gear
tubular shaft
shaft
flange
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
Application number
EP19840303847
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0131380A1 (en
Inventor
Kinji Tsuda
Munenobu Honda
Yoshio Ueno
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.)
Elephant Chain Block Co Ltd
Original Assignee
Elephant Chain Block Co Ltd
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
Application filed by Elephant Chain Block Co Ltd filed Critical Elephant Chain Block Co Ltd
Publication of EP0131380A1 publication Critical patent/EP0131380A1/en
Application granted granted Critical
Publication of EP0131380B1 publication Critical patent/EP0131380B1/en
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
    • B66D3/12—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable
    • B66D3/16—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable operated by an endless chain passing over a pulley or a sprocket
    • 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
    • B66D3/26—Other details, e.g. housings

Definitions

  • This invention relates to a hoist, and more particularly to a hoist provided with a frame having a pair of side plates, a tubular shaft mounted therebetween and having a loaded sheave, a drive shaft mounted in the tubular shaft and having projecting shafts projecting outwardly beyond each axial end of the tubular shaft, and a reduction gear mechanism which is provided with first, second, third and fourth gears for transmitting a driving force from the drive shaft to the tubular shaft.
  • Conventional hoists of the above type have the first gear of the reduction gear mechanism formed at the outer periphery of one of the projecting shafts on the drive shaft, second gear means engageable with the first gear, and third gear means engageable with a fourth gear coupled with the tubular shaft which are mounted on intermediate shafts supported between the one side plate of the frame and a side wall of a gear box fixed outside the side plate so that a driving force is transmitted from the drive shaft to the tubular shaft through the first, second, third and fourth gears.
  • a first gear G 1 of the conventional hoist is formed in such a manner that a projecting shaft P of a drive shaft D is made larger in diameter than the drive shaft D; a stop means or shoulder S is formed at the axially inward end of the larger diameter projecting shaft P for abutment with the axially outward end of the tubular shaft C, and a plurality of cut-out grooves a is provided on the projecting shaft P and extends axially inwardly from the axially outward end thereof.
  • a second gear G 2 is engageable with the first gear G 1 and a fourth gear G 4 has a splined connection with the tubular shaft C, a snap ring L being mounted on the tubular shaft Cto retain the fourth gear G 4 against axially outward movement from the tubular shaft C.
  • the hoist should be lightweight and small in size.
  • the driving shaft and tubular shaft need to be reduced in diameter.
  • the first gear G 1 which is formed on the driving shaft D by cutting thereinto, is however reduced in strength when the driving shaft D is of relatively small diameter so that the possibility of breakage thereof due to overloading arises. Accordingly it has not been possible to reduce the diameter of the drive shaft D beyond a predetermined limit.
  • the grooves a formed in the conventional hoist by cutting or matching extend axially inwardly of the drive shaft D beyond the shoulder S so that the axially outward end of the tubular shaft C fits over the grooved portion of the drive shaft D.
  • the conventional hoist locks in position the fourth gear G 4 by means of the snap ring L, whereby the aforesaid snap ring L and an annular groove b have to be provided specially therefor, thereby resulting in a high manufacturing cost.
  • axially outward movement of the fourth gear is restrained by a relatively cumbersome and heavy means comprising a large epicyclic reduction gear means in which a fourth gear is axially restrained by planetary third gears, with a large second internal ring gear means also being required.
  • the first gear provided on the drive shaft itself is used as an axial abutment means in relation to the tubular shaft resulting in possible damage between the gear teeth and the parts in abutment therewith and limited strength of the first gear.
  • the present invention provides a hoist having a frame with a pair of side plates, a tubular shaft supported between said side plates of said frame and having a load sheave, a drive shaft mounted in said tubular shaft and having projecting shafts projecting axially outwardly of each end of said tubular shaft, and a reduction gear means provided with first, second, third and fourth gears formed and arranged for transmitting a driving force from said drive shaft to said tubular shaft, said first gear being formed integrally with the outer peripheral portion of one of said projecting shafts on said drive shaft and provided at its axially inward end with an abutment means extending radially outwardly of said drive shaft for engagement with the adjacent axially outward end of said tubular shaft so as to restrain said drive shaft against axial movement, said driveshaft also mounting a washer, characterized in that said abutment means is in the form of a flange, said first gear and flange are formed integrally with said drive shaft by means of forging, and said washer having an outer peripheral surface
  • the drive shaft is supportable as its rounded outer periphery on the tubular shaft and also, a bearing, such as a needle bearing can be readily interposed between the drive shaft and the tubular shaft.
  • a washer which is larger in external diameter than the tubular shaft may be fitted onto the drive shaft thereby to lock the fourth gear, which is spline-coupled with the tubular shaft, in a simple manner.
  • Fig. 1 shows a manually operated hoist which is constructed with a frame 1 comprising a pair of first and second opposed side plates 11 and 12 at a predetermined spacing from each other.
  • a tubular shaft 3 having a load sheave 2 is supported rotatably between the side plates 11 and 12.
  • a drive shaft 4 extends through a central bore 13 inside the tubular shaft 3 so as to be rotatable relative thereto, and a reduction gear mechanism 5 is interposed between the drive shaft 4 and the load sheave 2, through which the drive force from the drive shaft 4 is reduced in - speed by the reduction gear mechanism 5 and transmitted to the load sheave 2.
  • the drive shaft 4 is axially longer than the tubular shaft 3 and at a first projecting shaft which projects axially leftwardly (as viewed in Fig. 1) of the tubular shaft 3, is formed a first gear 51 of the reduction gear mechanism 5 and at the outer periphery of a second projecting shaft which projects axially rightwardly (as viewed in Fig. 1) of the tubular shaft 3 is formed a screw thread 41.
  • a manually driven wheel 7 is screw-threadedly engaged therewith and a mechanical brake 8 is interposed between the wheel 7 and the first side plate 11 and sleeved onto the drive shaft 4, so that the wheel 7 rotates normally to be coupled fixedly with the drive shaft 4 through the mechanical brake 8.
  • a rotational driving force of the wheel 7 is transmitted from the drive shaft 4 to the load sheave 2 through the reduction gear mechanism 5 so that a chain (not shown) wound around the load sheave 2 will lift a load, and the wheel 7 rotates in the opposite direction intermittently to release the mechanical brake 8 thereby to rotate the load sheave 2 in the opposite direction under the influence of the weight of the load, thereby lowering it.
  • the first gear 51 in the above described embodiment is as shown in Fig. 2 formed to have a pitch diameter D 2 smaller than the external diameter 0, of the drive shaft 4, and is provided at its axially inward end, that is, the end towards the tubular shaft 3 with a flange 42 formed integrally with the projection shaft and extending radially outwardly of the drive shaft 4, thereby engaging the axial end face of the tubular shaft 3 to restrain the drive shaft 4 against axial movement.
  • the first gear 51 and flange 42 are formed integrally on the first projecting shaft and simultaneously with each other by cold forging, the flange 42 reinforcing the first gear 51 so that the first gear 51 can be reduced in diameter without significant loss of strength thereby enabling the hoist to be reduced in size.
  • fillets 43 are provided at the junction between the flange 42 and each tooth crest and bottom of the first gear 51 to increase further the strength thereof.
  • a washer 20 which is larger in external diameter than the tubular shaft 3 is mounted on the drive shaft 4 and abuts against the flange 42 thereby to lock the fourth gear 54 against escape from the tubular shaft 3.
  • This washer 20 is, however, not indispensable.
  • the flange 42 could be increased in external diameter sufficiently to contact directly one side face of the fourth gear 54, thereby locking it in position.
  • the drive shaft 4 is rounded at the outer periphery of a portion which is axially inward of the flange 4 and two needle bearings 30 and 31 are interposed between the respective axial end portions of the drive shaft 4 and the inner periphery of the tubular shaft 3 for smoothing relative rotation between the drive shaft 4 and the tubular shaft 3.
  • the flange 42 could be formed separately from the drive shaft 4 and coupled therewith instead.
  • the hoist transmission of the above-described embodiment of the invention could be equally well applied to an electrically operated hoist as to a hand operated one as illustrated.
  • the first gear 51 is formed mainly by cold forging and reinforced by the flange 42 connected directly thereto, whereby the first gear 51 has sufficient strength even when the drive shaft 4 is of relatively small diameter thus enabling overall size of the hoist to be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
EP19840303847 1983-06-10 1984-06-07 Hoist Expired EP0131380B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP89682/83U 1983-06-10
JP8968283U JPS59195193U (ja) 1983-06-10 1983-06-10 捲上機

Publications (2)

Publication Number Publication Date
EP0131380A1 EP0131380A1 (en) 1985-01-16
EP0131380B1 true EP0131380B1 (en) 1987-11-04

Family

ID=13977528

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840303847 Expired EP0131380B1 (en) 1983-06-10 1984-06-07 Hoist

Country Status (4)

Country Link
EP (1) EP0131380B1 (ko)
JP (1) JPS59195193U (ko)
KR (1) KR890003657Y1 (ko)
DE (1) DE3467145D1 (ko)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH674642A5 (ko) * 1988-01-14 1990-06-29 Marco Bachmann
JP2601403B2 (ja) * 1993-12-03 1997-04-16 象印チエンブロック株式会社 手動式チェンブロック
US5556078A (en) * 1992-12-16 1996-09-17 Elephant Chain Block Company Limited Manual hoist and traction machine
US5544863A (en) * 1993-07-02 1996-08-13 Elephant Chain Block Company Limited Manual chain block
JP2919809B2 (ja) * 1997-05-15 1999-07-19 象印チエンブロック株式会社 手動式チェンブロック
JP5550410B2 (ja) * 2010-03-25 2014-07-16 株式会社キトー 手動チェーンブロック
JP5827188B2 (ja) * 2012-07-30 2015-12-02 株式会社キトー チェーンブロック

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1492581A (en) * 1919-12-19 1924-05-06 Palmer Bee Co Hoist
US1949920A (en) * 1931-03-26 1934-03-06 Riley Engineering & Supply Co Hoist
US2324000A (en) * 1940-10-10 1943-07-13 Coffing Hoist Company Hoist structure
JPS5227808Y2 (ko) * 1973-05-14 1977-06-24
JPS5443492U (ko) * 1977-08-31 1979-03-24
US4221364A (en) * 1978-08-07 1980-09-09 Kabushiki Kaisha Toa Kiaki Seisakusho Chain block

Also Published As

Publication number Publication date
EP0131380A1 (en) 1985-01-16
DE3467145D1 (en) 1987-12-10
KR890003657Y1 (ko) 1989-05-31
JPS59195193U (ja) 1984-12-25

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