AU597506B2

AU597506B2 - Hoist

Info

Publication number: AU597506B2
Application number: AU20216/88A
Authority: AU
Inventors: Joris Maes
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-07-30
Filing date: 1988-07-29
Publication date: 1990-05-31
Anticipated expiration: 2008-07-29
Also published as: ZA885576B; EP0301657A1; PT88146B; NO883364L; DK425188A; PT88146A; KR890001863A; NZ225557A; AU2021688A; CN1031063A; DK425188D0; NO883364D0; FI883493A; FI883493A0; JPH01117198A; BE1000710A4

Description

11 597506 AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION

(ORIGINAL)

FOR OFFICE USE Application Number: Lodged: Complete Specification Lodged: Accepted: Published: .::Priority: Related Art: 0

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mnoQ *Name of Applicant: 0' Address of Applicant: .Actual Inventor: 0 *0 0 ".Address for Service: 4.

000 BE COMPLETED BY APPLICANT JORIS MAES 5677 Mount Berry Lane, Norcross GA 30092 U.S.A.

JORIS MAES ARTHUR S CAVE CO.

Patent Trade Mark Attorneys Level 10 Barrack Street SYDNEY N.S.W. 2000

AUSTRALIA

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4 a Complete Specification for the invention entitled HOIST.

S The following statement is a full description of this invention including the best method of performing it known to me:- 1 ASC 49 i 'i lal Hoist a S* This invention relates to a hoist, in other words to a device to lift or lower charges or for pulling loads by means of a cable q being guided over a driving pulley. The invention particularly relates to a hoist of the type where one driving pulley is formed by two combined pulley halves forming together a cable groove.

From the European patent application Nr 189.219 a hoist is known Q"lO'where two pulley halves pressed together by means of elastic means, forming a V-shaped cable groove, are used.

Such hoist however, has the main disadvantage that as a result -f the great force with which the two pulley halves are pressed against each other on the one hand, and the V-shape of the groove on the other hand, the cable is radially forced outwards,

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causing therefore interferences and irregularities affecting the good working of the device.

And so that first aim of the present invention is to provide for a hoist where the said disadvantage is systematically avoided. More generally still the invention is intended to provide for a hoist offering the combination of the following favourable characteristics: a uniform pressure on the cable over the entire angle of contact, mainly by using pulley halves being in a parallel position with each other; an eas automatic cabling of the device after the cable #000 end has been presented to it; 0 o0 the cable remains in its correct position between the two •0 pulley halves under all circumstances, in other words is not tending to move away radially from the centre of the cable pulley.

In one broad form the invention provides a hoist for post 0 lifting and lowering loads by means of a wire rope, which S comprises: a driven pulley having a first and a second pulley halve 0 mounted in a housing so as to rotate around a central axis, said pulley halves being mutually axially diplaceable, opposed groove flanks on the pulley halves defining a rope gripping groove for causing the wire rope to move along its length, means for biasing the second pulley halves towards the first one, means for rotating the pulley halves about the central G ALk/AJ 2 k/AJG 2 71- axis, and around a portion of the circumference of the pulley halves, sW'1opposed groove flanks of the pulley halves having parallel flank portions at the bottom end of the rope-.gripping groove where driving engagement with the wire occurs and outwardly inclined wire threading flank portions at the open end thereof, and said rope guiding rollers being disposed so that their peripheral portions extend within the rope gripping groove but are out of contact with a wire rope that rests on the bottom of the rope gripping groove.

With a view to show the better characteristics of the 0* 0 invention a description of a preferred embodiment is given 00 69 hereafter as an excample without any restrictive character, 0004 i: referring to the attached drawings, where: figure 1 shows a cross-section of the hoist according to the invention; .figure 2 shows a cross-section between the two pulley .':halves; 4 0 4figure 3 shows the part marked by F3 in figure 1 on a larger scale.

te As indicated in figures 1 and 2 the hoist according to teinvention mainly consists of a driving pulley 1 consisting of two parallel pulley halves 2 and 3; elastic means 4 pressing the pulley halves 2 and 3 axially together; a cable groove formed by the two pulley halves and a number of small cable guiding wheels 6 along the outer circumference of the cable groove I*J -3- -4- In the embodiment shown the pulley half 2 is mounted rotatably with respect to the casing 9 by means of bearings 7 and 8. The second pulley half 3 is held in place with respect to the first half 2 by means of a number of bolts 10, supporting at the same time the aforementioned elastic means 4.

The elastic means 4 axially prt:sing the pulley halves 2 and 3 together may consist of springs chosen at random such as Belleville springs, helical springs, etc. It is noted that the tension of the springs is determined by the force to be exerted on the cable 11, in such a way that is not deformed on the one hand and there will be sufficient friction to have the charges lifted by the hoist without any danger of slipping on the other hand a o S A remarkable characteristic of the invention lies in the fact that a combination is provided for where the two pulley halves 2 ;and 3 are parallel, while the cable groove 5 formed by the pulley halves 2 and 3 in the area where the cable is gripped will have parallel flank parts 12 and 13, as is shown more specifically in figure 3.

I An other particular characteristic of the invention consists in the fact that this cable groove 5 over its. angle of contact presents inclined flank parts 14 and 15 fitting with the 0* 00

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parallel flank parts 12 and 13 and forming a V-shaped part.

Preferably the inclining flank parts 14 and 15 will make an angle A with the main plane of cable pulley 1, being 12,5 degrees. At their extreme outer circumference the pulley halves 2 and 3 may be provided with roundings 16 and 17.

The aforementioned small cable guiding wheels 6 are, as shown in figure 2, mainly situated along the entire circumference of the cable groove 5. They preferably consist of bearings, mounted on small shafts 18, fixed in casing 9.

Preferably but not necessarily one small cable guiding wheel 6A will be used near the area 19 where the free end 20 of the cable 11 is introduced respectively leaves, having a larger diameter o 0a o o0 9 than the other small cable guiding wheels 6. The advantage of it Swill be explained hereafter.

15 It is clear that all small wheels 6-6A may have the same diameter.

The hoist is driven preferably by means of a driving shaft 21 and an external toothing 22; planetary gears 23 situated round 9 *00 the driving shaft 21 and working together with it; and a bush 24 fixed to the driving pulley 1, meshing with the planetary gears t 23 by means of an external toothing 25. The shaft 21 may be 99 9 0 e 0 00 -6driven either manually by means of a crank or similar device, or automatically for instance by an electric motor either fixed to the aforementioned casing 9 or not.

The use of the aforementioned planetary linking mainly has the advantage that the hoist wil be particularly compact.

It is clear that the hoist will provided with means 26 or 27 permitting to fix the unit in an efficient way.

The working of the hoist can be easily deduced from the drawings. First one end of cable 11 is introduced into the device either through passage 28, or through passage-29, whereby same will be automatically guided round the cable pulley 1 by Smeans of the small cable guiding wheels 6. Hereby is mentioned that thanks to the special design of the cable groove 5 a G p4 resulting force will be developed, in such a way that when f 15 introducing the cable 11 the two pulley halves 2 and 3 are pushed apart and the cable is brought into the correct working position. During normal working the cable 11 lies in the cable groove 5 in such way as shown in figure 1 that it will be S gripped between the two parallel flank parts 12 and 13 of the pulley halves 2 and 3.

It is also to be noted that the sme-ll cable guiding wheels 6 don't exert any pressure on the cable 11 during normal use of -7the hoist. On the other hand the small cable guiding wheel 6A near the area 19 where the cable is introduced or leaves the device will exert a certain pressure on the cable 11, in order to keep it down in the cable groove 5. According to a first possibility the small cable guiding wheel 6A may be mounted fixed, while according to a second possibility it may be pushed in the direction of the cable pulley 1, by means of springs or similar, not shown on the drawing.

The present invention is in no way limited to the embodiment decribed as an example, but such a hoist may be realized in different forms and dimensions without going beyond the scope of this invention.

06 0 a 9 00 0 l--~x---rvLI

Claims

2. A hoist according to claim i, wherein the parallel flank portion of one of the pulley halves extends straight up from the bottom of the rope gripping groove, and tie opposed parallel flank portion joins the bottom of the rope gripping groove through a flank section curved through degrees. 00 4
3. A hoist according to claim 1, wherein the parallel flank portion of the second pulley half extends up to the lowest point of the bottom at the rope gripping groove.
4. A htist according to claim 1, wherein the inclined flank portions of the rope ,jripping groove make equal angles with the parallel flank portions. A hoist according to claim 4, wherein said angles equal about
12.5 degrees. -8- 'MN! i: r 6. A hoist according to any one of claims 1 to 5, wherein the rope guiding rollers have equal diameters. 7. A hoist according to any one of claims 1 to 6, wherein the rope introduction roller is fixedly mounted and has a larger diameter than the rope guiding rollers. G. A hoist according to any one of claims 1 to 6, wherein the rope introduction roller is mounted displaceable anO is biased by spring means in the direction of the rope pulley. 9. A hoist according to claim 8, wherein the rope introduction roller is mounted such that its periphery is in contact with a wire rope that rests on the bottom of the rope gripping groove. 10. A hoist, substantially as herein described with reference to the drawings. DATED this 5th day of March, 1990. 46 6 0 66 6 6664 *466 66 44 6 66 46 64 4 6 4 JOR18 MAE$ By His'Patent Attorneys ARTHUR S._CAVE CO. 6 164 1 6~5ISJG 9-