WO2008118105A1

WO2008118105A1 - Pulley block

Info

Publication number: WO2008118105A1
Application number: PCT/SI2007/000014
Authority: WO
Inventors: Iztok Span
Original assignee: Tajfun Planina Proizvodnja Strojev, D.O.O.
Priority date: 2007-03-23
Filing date: 2007-03-23
Publication date: 2008-10-02

Abstract

The invention relates a casing (50) of a rope pulley or a similar transmission element (57),optionallly a belt pulley, chain wheel or a pulley, chain wheel or a pulley for guiding any other flexible conveying member (6), and in particular for an auxiliary pulley block (5) of a forestry winch. In order to avoid supporting of the axle (55) of said transmission element (57) in a cantilevered manner, such casing should allow supporting thereof at both sides and simultaneously also placing said flexible transmission means (6) over the transmission element or removing it there-from without interrupting the transmission means (6) or removing the transmission element from the axle. The casing consists of two parts (501, 502), wich are positively interconnected and pivoted around a common axis (500), each comprising two bearing segments (5011, 5012 oz 5021, 5021), arranged one above the other and a supporting area (5015), 5025) for supporting the axle (55).

Description

Pulley block

The invention belongs to machinery engineering and engineering elements, in particular to gearings for conveying rotary motion by means of endless flexible members, and especially to auxiliary equipment for mounting belts, ropes or chains. On the other hand the invention may also belong to performing operations and transporting, namely to winches and in particular to chain, belt or rope friction drives including the belonging chain wheels and belt or rope pulleys and constructional details related thereto.

The purpose of the invention is to create a casing for a rope pulley or optionally a belt pulley, chain wheel or a pulley for guiding any other flexible transmission means, especially an endless or a looped rope, belt or chain serving for transmission of rotationally movement, and in particular for an auxiliary pulley block of a forestry winch, by which on the one hand supporting of the axle of said transmission element in a cantilevered manner should be avoided by supporting said axle in both end portions thereof, and on the other hand placing said flexible conveying member around/over said transmission element or removing said conveying member when desired should be enabled without interrupting the conveying member or without removing the transmission element and/or without removing of said axle from the casing or removing said transmission element from the axle. Those skilled in the art are probably informed about various embodiments of casings, which are adapted to receive rope pulleys, belt pulleys or chain wheels or similar transmission elements adapted for guiding ropes, belts or chains or similar flexible members for conveying rotary motion. Such casings are adapted to receive appropriate axle or a shaft, on which each corresponding transmission element is placed. Whenever the flexible conveying member is available in the endless form, or in form of a loop, and there is a need to remove said element from time to time, then said transmission element is normally placed on such axle, which is supported in a cantilevered manner, so that upon removing of a covering part of such casing said transmission element may be accessed around the complete circumstance thereof, so that the conveying member may either be placed thereon or also be removed there-from.

A similar approach is described in SI9600339, which relates to a forestry winch, in which in addition to a drum an auxiliary pulley block is foreseen, over which the rope is re-directed when desired, especially for the purposes of amending the direction of the tension force resulting from the rope. In such embodiment the flexible conveying member i.e. a steel rope in form of a loop is allowed to be placed onto a rope pulley i.e. a transmission element, which is mounted within appropriate casing, or also removed there-from. However, such placing or removing is not feasible by simply inserting a free end of the conveying member between the casing and the transmission element and bending the member around said element, since such free end is not available at all. Consequently, said flexible conveying member is placed onto the transmission element from the side, namely in the axial direction of the element, by which said conveying member is bent into the shape of the letter U by forming a loop, upon which said loop is placed from the side around the circumference of the transmission element. This is however feasible, when the transmission element is accessible around its complete circumference, which practically means, that the axle of said transmission element must either be supported in a cantilevered manner or may exceptionally also be supported in the both ends thereof, by which either a aprt of the casing must be removed together with said axle or a transmission element must be displaced in the axial direction within the casing, if there is enough place at all for performing such measures. In the above mentioned SI 9600339 the axle of the transmission element is supported in a cantilevered manner, which means that the axle must be extremely rigid and bulky and that moreover also the casing must be conceived in an extremely rigid manner at least in the area of mounting said axle. Despite to said measures the loading conditions are extremely hard, while each defect might lead to suddenly releasing of a complete towing load and herewith to extreme danger of accident or other damages.

A present invention relates to a pulley block or a similar casing of a transmission element adapted for conveying of the rotary motion by means of a flexible conveying member, and particularly to a pulley block of a forestry winch, by which on appropriate axle or shaft placed within appropriate casing an appropriate transmission element is available, namely a rope pulley, belt pulley, chain wheel or a similar transmission element, which is adapted to co-operate with each desired conveying member, where said conveying member may either be placed via said transmission element or when desired also removed there-from.

According to the invention said casing consists of two parts, which are allowed to be positively interconnected and pivoted around a common axis, where each of them comprises two bearing segments, which are arranged each above the other, as well as a supporting area, which is adapted to support an axle of each corresponding transmission element. Each of such mutually in a positive manner interconnected parts of the casing comprises two bearing segments, which are arranged each above the other, as well as a supporting area adapted to support a rope pulley as a transmission element.

In a preferred embodiment said the two-part casing comprises two coaxially with respect to the axis each above the other arranged bearing seats as well as two supporting areas, which are arranged on separate parts of the casing and on opposite sides of the transmission element, in which the axle together with said transmission element rotationally placed thereon is then supported, by which each particular part of said casing comprises two apart in opposite directions protruding bearing segments, at least one of which is furnished with a cutoff arranged on the side faced towards the transmission element. Consequently, one pair of said bearing segments is in a mutually assembled state inserted within the first bearing seat, while the other one pair of said bearing segments is in a mutually assembled state inserted within the second bearing seat. Accordingly, both parts of the casing are then inserted within said bearing seats and may be swiveled simultaneously or separately each toward another or each apart from another at a desired angle (φ) around the axis, wherein said parts are positively interconnected and are moreover allowed to be arrested in a mutually assembled state by means of appropriate arresting assembly. Said parts are positively interconnected preferably by means of engagement elements arranged on the contact edges thereof. Said engagement elements preferably consist of recesses and protrusions, which are formed on the contact edges of both parts of the casing. Still further, said arresting assembly preferably consists of an arresting seat, which is arranged on one part of the casing, as well as of a locking member, which is adapted to co-operate with said arresting seat and furnished with a pivotal handle, so that in the assembled state of both parts of the casing by pivoting said handle together with the locking member into the first end position both parts of the casing are allowed to swivel apart from each other, while upon pivoting said handle together with the locking member into the second end position both parts of the casing are prevented to swivel apart from each other.

Still further, the invention provides that at least one in each pair of bearing segments, which are inserted in each bearing seat, is furnished with an inclined cutoff, which enables separately pivoting of each part of the casing around the axis at an angle of 10 - 60°, preferably 15 - 45°, and most preferably for at least approximately 30°, by which said cutoffs on each of bearing segments are either essentially identical or different.

The invention also relates to a pulley block of a forestry winch, which also comprises a casing, which is mounted in a swiveling manner within appropriate bearing seats available on the forestry winch, and in which an axle is mounted together with a rope pulley, which may freely rotate around it and is adapted to cooperate with a steel rope, which may either be placed around said rope pulley or optionally also removed there-from. Such casing is also formed as a two-part casing and comprises two supporting areas, each of them is available on a separate part of said casing and is arranged on the separate side of the rope pulley, in which an axle is supported together with the rope pulley placed thereon, wherein each particular part of said casing comprises two apart in opposite directions protruding bearing segments, at least one of which is furnished with an inclined cutoff arranged on the side faced towards the transmission element, so that one pair of said bearing segments is in a mutually assembled state inserted within the first bearing seat and the other pair of said bearing segments is in a mutually assembled state inserted within the second bearing seat, so that both parts of the casing are then inserted within said bearing seats and may be swiveled simultaneously or separately each toward another or each apart from another at a desired angle around the axis, and wherein said parts are positively interconnected and are moreover allowed to be arrested in a mutually assembled state by means of appropriate arresting assembly. Again, said parts are positively interconnected preferably by means of engagement elements, which are arranged on the contact edges thereof, wherein said engagement elements preferably consist of recesses and protrusions, which are formed on the contact edges of both parts of the casing. Moreover, said arresting assembly preferably consists of an arresting seat, which is arranged on one part of the casing, as well as of a locking member, which is adapted to co-operate with said arresting seat and is furnished with a pivotal handle, so that in the assembled state of both parts of the casing by pivoting said handle together with the locking member into the first end position both parts of the casing are allowed to swivel apart from each other, while upon pivoting said handle together with the locking member into the second end position both parts of the casing are prevented to swivel apart from each other. In this, at least one in each pair of bearing segments, which are inserted in each bearing seat, is furnished with an inclined cutoff, which enables separately pivoting of each part of the casing around the axis at an angle of 10 - 60°, preferably 15 - 45°, and most preferably for at least approximately 30°, by which the cutoffs on each of bearing segments are either essentially identical or different.

A preferred embodiment of the invention will be described in more detail on the basis of the enclosed drawing, in which

Fig. 1 is a perspective view of an embodiment of the pulley block according to the invention in its opened state; Fig. 2 the same pulley block when cooperating with a forestry winch;

Fig. 3 is a detail view A according to Fig. 2;

Fig. 4 is a rear view of said pulley block when removed from the bearing seats;

Fig. 5 is a side view of the pulley block according to Fig. 4; and

Fig. 6 is a top view of the pulley block according to Figs. 4 and 5.

Fig. 1 presents a pulley block or generally speaking any other casing of each desired flexible member for conveying a rotary motion, namely for example a rope pulley or a belt pulley or a chain wheel or any other transmission element, which is adapted either to guide or to redirect a rope or a belt or a chain or any other flexible conveying member, which may either endless or loop-shaped, and which is generally able to transfer a force or a torque.

The further description of a particular embodiment will be focused exclusively to a rope pulley block, which is used as a transmission element, and a rope used as a conveying member, while the practical exploitation is merely explained on the basis of application in relationship with a forestry winch (Fig. 2), which may however not be understood as a limitation of the scope of the invention. Those skilled in the art will no doubt understand, that such invention may without any substantial modifications also be applied in various embodiments and in various combinations of transmission elements and conveying members.

As shown in Fig. 2 the forestry winch 8 is mounted on a tractor 9 and includes a main pulley block 7, by means of which the rope 4 is guided and is thereby either wound onto appropriate drum or unwound there-from. Said main pulley block 7 is normally placed at relatively large distance from the ground, which however may have negative impact when bearing in mind stability of said tractor 9, especially when the rope 6 is tensioned by an essential force, so that an auxiliary pulley block 5 (Fig. 2) is preferably available on such winch 8, and should normally be placed as close as possible to the ground. Accordingly, the rope 6 may be redirected via said auxiliary pulley 5, as soon as some more comprehensive loading conditions in the rope 6 are expected.

A pulley block according to the invention may be used for the purposes of establishing such auxiliary pulley block 5, which then consists of two coaxial bearing seats 51, 52, which are arranged one above the other and between which the casing 50 of the pulley block 5 is placed, which is engaged within said bearing seats 51, 52 and is then allowed to swivel at least at certain angle around an axis 500, which extends through said bearing seats 51, 52. For such purposes each bearing seat 51, 52 is furnished with a cylindrical bore, the axis of which coincides with said axis 500.

According to the invention (Fig. 1) said pulley block 5 comprises a casing 50, which consists of two parts 501, 502, which are positively interconnected and may in addition to that also be pivoted around said axis 500, where each of them comprises two each above the other arranged bearing segments 5011, 5012; 5021, 5022 and appropriate supporting area 5015, 5025 of the axle 55 of the rope pulley 57 as a transmission means.

In this, each of said bearing segments 5011, 5012; 5021, 5022 comprises an inclined cutoff 5011', 5012' oz 5021', 5022'. When said bearing segments 5011, 5012; 5021, 5022 are inserted within the belonging bearing seats 51, 52, then both parts 501, 502 of the casing 50 of the pulley block 5 may thanks to said cutoffs 5011', 5012' oz 5021', 5022' be pivoted one towards the other or apart from each other, if desired. As foreseen in the shown embodiment, the pivoting angle φ of each part 501, 502 is approximately 30°.

Furthermore, said casing 50 of the pulley block 5 comprises an arresting assembly 56, which generally serves for establishing a detachable interconnection of both parts 501, 502 of said casing 50, namely either for connecting both parts 501, 502 in a state of mutual engagement, or also for releasing such engagement in order to enable pivoting said parts 501, 502 around the axis 500.

Said positive interconnection of both parts 501, 502 of the casing 50 of the pulley block 5 may therefore be established by means of said arresting assembly 56 and also by means of engagement elements 58, which are foreseen on contact edges 58', 58" of both parts 501, 502 of the casing 50. In the shown embodiment several alternatively repeating protrusions and recesses are foreseen on said contact edges 58', 58", which by mutual engagement of both parts 501, 502 leads to extremely rigid construction of the complete casing 50 and herewith also to co-axial positioning of both supporting areas 5015, 5025 and firmly supporting of the axle 55 of the pulley 57.

In this particular embodiment said arresting assembly 56 consists of an arresting seat 561, which is available on a desired part 502 of the casing 50, and also of a locking member 562, which is adapted to cooperate with said arresting seat 261, and may be either pivoted into a locked position on said seat 561 or also released by means of displacing in another position. Said displacing of the locking member 562 may be performed by means of a swiveling handle 563, which is mounted on the axle 55 of the pulley 57 and may be swiveled from one end position adjacent to the first limiting member 564 into another end position adjacent to the second limiting member 565, or vice versa.

When said casing 50 of the pulley block 5 is engaged within said bearing seats 51, 52, both parts 501, 502 of the casing 50 are positively interconnected thanks to the presence of the engagement elements 58 arranged along the contact edges 58', 58", and moreover also thanks to said arresting assembly 56, in which the locking member 562 is engaged within the arresting seat 561. Despite to the fact, that said casing 50 is engaged within the bearing seats 51, 52, it still may be swiveled around the axis 500, while consequently the rope pulley 57 is then able to rotate around the axle 55 and also to swivel in a relatively wide range in accordance with changes of the direction of the rope 6 related thereto. In this, said pulley 57 is mounted within the casing 50 on the axle 55, which is supported at both ends in two supporting areas 5015, 5025, which are available in said parts 501, 502 of the casing 50, through which the loading conditions are quite smooth.

Upon displacing the handle 563 said arresting assembly 56 is released, upon which both parts 501, 502 of the casing 50 are allowed to be swiveled and moved apart from each other. Generally speaking, the pulley 57 may freely be rotated on its axle 55 and needs not to be secured against being removed there-from, by which said pulley 57 remains present on the axle 55 even by swiveling said parts 501, 502 of the casing 50 at approximately 30° apart from each other, upon which the rope 6 may either be placed around the pulley 57 or also removed there-from, if desired. As soon as such placing or removing of the rope 6 is finished, said parts 501, 502 may be swiveled again around the axis 500 towards each other, which is then followed by arresting of mutually engaged parts 501, 502 of the casing 50.

Claims

PATENT CLAIMS

1. Pulley block (5) or a similar casing (50) of a transmission element (57) adapted for conveying of the rotary motion by means of a flexible conveying member (6), especially a pulley block (5) of a forestry winch (8), by which on appropriate axle or shaft (55), which is mounted within appropriate casing (50), an appropriate transmission element (57) is available, namely a rope pulley, belt pulley, chain wheel or a similar transmission element, which is adapted to cooperate with each desired conveying member (6), where said conveying member (6) may either be placed via said transmission element (57) or when desired also removed there-from, characterized in that said casing (50) consists of two parts (501, 502), which are allowed to be positively interconnected and pivoted around a common axis (500), each of them comprising two each above another arranged bearing segments (5011, 5012; 5021, 5022) as well as a supporting area (5015, 5025) adapted to support an axle (55) of each corresponding transmission element (57).

2. Casing according to Claim 1, characterized in that each of mutually in a positive manner interconnected parts (501, 502) of the casing (50) comprises two each above another arranged bearing segments (5011, 5012; 5021, 5022) and one supporting area (5015, 5025) for supporting a rope pulley (57) as a transmission element.

3. Pulley block according to Claim 1 or 2, characterized in that the two-part casing (50) comprises two coaxially with respect to the axis (500) each above the other arranged bearing seats (51, 52) as well as two supporting areas (5015, 5025), which are arranged on separate parts (501, 502) of the casing (50) and on opposite sides of the transmission element (57), and in which the axle (55) with said transmission element (57) rotationally placed thereon is then supported, wherein each particular part (501, 502) of said casing (50) comprises two apart in opposite directions protruding bearing segments (5011, 5012; 5021, 5022), at least one of which is furnished with a cutoff (5011', 5012'; 5021', 5022') arranged on the side faced towards the transmission element (57), so that one pair of said bearing segments (5011, 5012) is in a mutually assembled state inserted within the first bearing seat (51) and the other pair of said bearing segments (5021, 5022) is in a mutually assembled state inserted within the second bearing seat (52), so that both parts (501, 502) of the casing (50) are then inserted within said bearing seats (51, 52) and may be swiveled simultaneously or separately each toward another or each apart from another at a desired angle (φ) around the axis (500), and wherein said parts (501, 502) are positively interconnected and are moreover allowed to be arrested in a mutually assembled state by means of appropriate arresting assembly (56).

4. Pulley block according to one of Claims 1 to 4, characterized in that said parts (501, 502) are positively interconnected by means of engagement elements (58) arranged on the contact edges (58', 58") thereof.

5. Pulley block according to Claim 4, characterized in that said engagement elements (58) consist of recesses and protrusions, which are formed on the contact edges (58', 58") of both parts (501, 502) of the casing (50).

6. Pulley block according to one of the preceding Claims, characterized in that said arresting assembly (56) consists of an arresting seat (561), which is arranged on one part (501) of the casing (50), as well as of a locking member (562), which is adapted to co-operate with said arresting seat (561) and furnished with a pivot handle (563), so that in the assembled state of both parts (501, 502) of the casing (50) by pivoting said handle (563) together with the locking member (562) into the first end position both parts (501, 502) of the casing (50) are allowed to swivel apart from each other, while upon pivoting said handle (563) together with the locking member (562) into the second end position both parts (501, 502) of the casing (50) are prevented to swivel in the opposite direction apart from each other.

7. Pulley block according to one of Claims 1 to 6, characterized in that at least one in each pair of bearing segments (5011, 5012; 5021, 5022), which are inserted in each bearing seat (51, 52), is furnished with an inclined cutoff (5011', 5012"; 5021 ', 5022'), which enables separately pivoting of each part (501, 502) of the casing (50) around the axis (500) at an angle of 10 - 60°, preferably 15 - 45°, and most preferably for at least approximately 30°.

8. Pulley block according to one of Claims 1 to 6, characterized in that at least one in each pair of bearing segments (5011, 5012; 5021, 5022), which are inserted in each bearing seat (51, 52), is furnished with a cutoff (5011', 5012"; 5021 ', 5022'), which enables separately pivoting of each part (501, 502) of the casing (50) around the axis (500) at an angle of 10 - 60°, preferably 15 - 45°, and most preferably for at least approximately 30°, wherein the cutoffs (5011', 5012"; 5021 ', 5022') on each of bearing segments (5011, 5012; 5021, 5022) are essentially identical.

9. Pulley block according to one of Claims 1 to 6, characterized in that at least one in each pair of bearing segments (5011, 5012; 5021, 5022), which are inserted in each bearing seat (51, 52), is furnished with a cutoff (5011', 5012"; 5021', 5022'), which enables separately pivoting of each part (501, 502) of the casing (50) around the axis (500) at an angle of 10 - 60°, preferably 15 - 45°, and most preferably for at least approximately 30°, wherein the cutoffs (5011', 5012"; 5021', 5022') on each of bearing segments (5011, 5012; 5021, 5022) are different.

10. A pulley block (5) of a forestry winch, comprising a casing (50), which is mounted in a swiveling manner within appropriate bearing seats (51, 52) available on the forestry winch (8), and in which an axle (55) is mounted together with a rope pulley (57), which may freely rotate around it and is adapted to co-operate with a steel rope (6), which may either be placed around said rope pulley (57) or optionally also removed there-from, characterized in that said casing (50) is formed as a two-part casing and comprises two supporting areas (5015, 5025), each of them is available on a separate part (501, 502) of said casing (50) and is arranged on the separate side of the rope pulley (57), in which an axle (55) is supported together with the rope pulley (57) placed thereon, wherein each particular part (501, 502) of said casing (50) comprises two apart in opposite directions protruding bearing segments (5011, 5012; 5021, 5022), at least one of which is furnished with a cutoff (5011', 5012'; 5021', 5022') arranged on the side faced towards the transmission element (57), so that one pair of said bearing segments (5011, 5012) is in a mutually assembled state inserted within the first bearing seat (51) and the other pair of said bearing segments (5021, 5022) is in a mutually assembled state inserted within the second bearing seat (52), so that both parts (501, 502) of the casing (50) are then inserted within said bearing seats (51, 52) and may be swiveled simultaneously or separately each to other or each apart from the other at a desired angle (φ) around the axis (500), and wherein said parts (501, 502) are positively interconnected and are moreover allowed to be arrested in a mutually assembled state by means of appropriate arresting assembly (56).

11. Pulley block according to Claim 10, characterized in that said parts (501, 502) are positively interconnected by means of engagement elements (58) arranged on the contact edges (58', 58") thereof.

12. Pulley block according to Claim 11, characterized in that said engagement elements (58) consist of recesses and protrusions, which are formed on the contact edges (58', 58") of both parts (501, 502) of the casing (50).

13. Pulley block according to one of Claims 10 - 12, characterized in that said arresting assembly (56) consists of an arresting seat (561), which is arranged on one part (501) of the casing (50), as well as of a locking member (562), which is adapted to co-operate with said arresting seat (561) and furnished with a pivotal handle (563), so that in the assembled state of both parts (501, 502) of the casing (50) by pivoting said handle (563) together with the locking member (562) into the first end position both parts (501, 502) of the casing (50) are allowed to swivel apart from each other, while upon pivoting said handle (563) together with the locking member (562) into the second end position both parts (501, 502) of the casing (50) are prevented to swivel apart from each other.

14. Pulley block according to one of Claims 10 to 13, characterized in that at least one in each pair of bearing segments (5011, 5012; 5021, 5022), which are inserted in each bearing seat (51, 52), is furnished with an inclined cutoff (5011 ', 5012"; 5021 ', 5022'), which enables separately pivoting of each part (501, 502) of the casing (50) around the axis (500) at an angle of 10 - 60°, preferably 15 - 45^°, and most preferably for at least approximately 30°.

15. Pulley block according to one of Claims 10 to 13, characterized in that at least one in each pair of bearing segments (5011, 5012; 5021, 5022), which are inserted in each bearing seat (51, 52), is furnished with an inclined cutoff (5011', 5012"; 5021 ', 5022'), which enables separately pivoting of each part (501, 502) of the casing (50) around the axis (500) at an angle of 10 - 60°, preferably 15 - 45°, and most preferably for at least approximately 30°, wherein the cutoffs (5011', 5012"; 5021', 5022') on each of bearing segments (5011, 5012; 5021, 5022) are essentially identical.

16. Pulley block according to one of Claims 8 to 13, characterized in that at least one in each pair of bearing segments (5011, 5012; 5021, 5022), which are inserted in each bearing seat (51, 52), is furnished with an inclined cutoff (5011', 5012"; 5021 ', 5022'), which enables separately pivoting of each part (501, 502) of the casing (50) around the axis (500) at an angle of 10 - 60°, preferably 15 - 45°, and most preferably for at least approximately 30°, wherein the cutoffs (5011 ', 5012"; 5021', 5022') on each of bearing segments (5011, 5012; 5021, 5022) are different.