WO1995017619A1 - Chain flail apparatus and chain lengths therefor - Google Patents

Chain flail apparatus and chain lengths therefor Download PDF

Info

Publication number
WO1995017619A1
WO1995017619A1 PCT/GB1994/002779 GB9402779W WO9517619A1 WO 1995017619 A1 WO1995017619 A1 WO 1995017619A1 GB 9402779 W GB9402779 W GB 9402779W WO 9517619 A1 WO9517619 A1 WO 9517619A1
Authority
WO
WIPO (PCT)
Prior art keywords
chain
links
section
cross
limbs
Prior art date
Application number
PCT/GB1994/002779
Other languages
French (fr)
Inventor
Christopher Burdon
Ian D. Smith
Original Assignee
Parsons Chain Company Limited
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 Parsons Chain Company Limited filed Critical Parsons Chain Company Limited
Priority to AU12772/95A priority Critical patent/AU1277295A/en
Publication of WO1995017619A1 publication Critical patent/WO1995017619A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G13/00—Chains
    • F16G13/18—Chains having special overall characteristics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/12—Debarking or removing vestiges of branches from trees or logs; Machines therefor using pliable tools, e.g. chains, cables
    • B27L1/122—Debarking or removing vestiges of branches from trees or logs; Machines therefor using pliable tools, e.g. chains, cables fixed on one side onto a rotatable axis, e.g. brushes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G13/00—Chains
    • F16G13/12—Hauling- or hoisting-chains so called ornamental chains

Definitions

  • This invention relates to chain flail apparatus and, more particularly, to chain flail apparatus in which lengths of chain are attached at one end to the periphery of a rotatable drum or shaft such as in apparatus for de ⁇ barking felled trees or logs.
  • the felled trees or logs are guided axially past the rotating drum to be contacted by the flail chains which act to strip away the bark.
  • Chain of conventional form having links formed with circular cross-section crowns and limbs is utilised in such chain flail apparatus.
  • Such conventional chain is considered to have little or no lateral stiffness and limited torsional stiffness even when in tension.
  • chain flail apparatus including lengths of chain attached at one end to a rotatable drum or shaft wherein the chain is fabricated with chain links of a form enhancing the lateral and torsional stiffness of the chain lengths compared with the lateral and torsional stiffness of conventional form chain links formed with circular cross-section crowns and limbs.
  • the chain flail apparatus is provided with chain lengths composed of links having limbs and crowns of generally oval cross-section having a greater dimension in a direction perpendicular to a plane axial of the link than in a direction in that plane.
  • Chain formed with links having crowns and limbs of a non-circular cross-section is disclosed in GB-A-2 200 428, which, in turn makes reference to earlier forms of such chain in other patent specifications.
  • this earlier disclosure is concerned with chain utilised in conjunction with chain conveyor installations and is directed toward a chain having a greater tension strength directed toward a chain having a greater tension strength for a given link size.
  • the dynamics of flail chains are not within the scope of the earlier disclosures.
  • chain lengths In a flail chain apparatus for de-barking felled trees or logs, chain lengths, approximately seven to nine links long are secured at intervals along and around a rotatable drum.
  • Bolts extending over the length of the drum spaced at equi-angular intervals of 45° or 60° around the drum are secured at intervals through lugs mounted on the periphery of the drum and carry end links of the chain lengths.
  • the drum and chains are contained within the body of the apparatus which includes a surrounding safety hood and guide rollers which are used to guide the logs past the rotating drum.
  • the chain length is composed of links 2 having crowns 4 and limbs 6.
  • the crowns and limbs are of approximately constant, generally oval, cross- section, formed as a pair of semi-circles 8 linked by short, straight-line tangents 10.
  • the dimension 12 between the two semi-circles approximates to the dimension 14 between the inner faces of the limbs 6.
  • a clearance of about one millimetre to one and a half millimetres is provided between the abutting faces with, for example, dimension 12 being twenty millimetres and dimension 14 being twenty three millimetres.
  • the effect of making the limbs and crowns of generally oval cross-section and having limited clearance is to increase the lateral and torsional stiffness of the chain length so that there is less freedom of movement of the chain links compared with chain of conventional form. It will be appreciated that when the flail chain is rotated by rotating the central drum at a relatively high speed the resulting centrifugal force puts the chain lengths in tension thereby urging adjoining crown portions into close contact to form a relatively rigid seating and further increases the stiffening effect. This tension is increased when the flail chain contacts the log by virtue of the pull on the chain in contact with the log thereby increasing the force urging adjoining crown portions into close contact and rigidfying the connections between the links.
  • the enhanced stiffness of the chain and the flatter approach of the chain to the log have the effect of imposing a greater traction on the log surface by the chain, thereby enhancing removal of bark and any residual small branches or twigs from the log to achieve an improved performance of the chain flail apparatus as compared with apparatus utilising conventional, circular cross-section crowns and links, chain lengths since adjoining links of such chain are relatively free to pivot the one in relation to the other. It is anticipated that this will lead to a longer chain life compared to the life of chain lengths of conventional form.
  • a suitable material for the links is a carbon- manganese- boron steel.
  • Figure 2 shows an arrangement in which the contour of the periphery of the cross-section of the links 16 corresponds to the curvature of the interior of the crowns 18 of the links, thereby producing contact between adjacent face portions of adjoining links.
  • Figure 3 shows an arrangement in which the links have an oval cross-section of the crown portions 20 similar to that of Figure 2 but with round cross-section limbs 22, thereby reducing the mass of the link for a given length of link and reducing the inertia of the links when being revolved as flails.
  • Figure 4 shows an arrangement in which the links have an oval cross-section in crown portions 24 and a circular cross-section in limb portions 26.
  • the oval cross-section has side portions of greater radius of curvature than the radius of curvature of the interior of the crown portions 24 such that a small gap 28 is formed between the interlocking crown portions thereby reducing the area of contact between the faces of adjoining links compared with the arrangement of Figure 3 whilst achieving a greater contact area than in a conventional link arrangement, further varying the dynamic inertia characteristics of the chain length.
  • Figure 5 shows an arrangement in which the links have an oval cross-section in crown portions 30 and a square cross-section in limb portions 32.
  • the oval cross-section has side portions of a radius of curvature corresponding to the radius of curvature of the interior of the crown portion 30.
  • Such links have a higher mass and dynamic inertia than a conventional link and have a different inertia characteristic from the chain lengths described above.
  • Figure 6 shows an arrangement in which the links have an oval cross-section in crown portions 34 and square cross-section in the limbs 36.
  • the oval cross-section of the crown portions 34 has side portions of a greater radius of curvature than the radius of curvature of the interior of the crown portion 34 such that a small gap 38 is formed intermediate the interlocking crown portions thereby reducing the area of contact between the faces of adjoining links compared with the arrangement of Figure 5 whilst achieving a greater contact area than in a conventional link arrangement, further varying the dynamic inertia characteristics of the chain length.
  • Figure 7 shows an arrangement utilising a composite chain composed of alternate links 40, 42 respectively having circular cross-sections and oval cross-sections.
  • the radius of curvature of the side portions of the oval cross-section links 42 is greater than the radius of curvature of the interior of crown portions 44 of the circular cross-section links 40 such that a small gap 46 is formed intermediate the interlocking crown portions.
  • the dynamic inertia characterisitics of lengths of such chain are different from those of chain lengths of conventional link form.
  • Figure 8 shows an arrangement utilising a composite chain composed of alternate links 48, 50 respectively having circular cross-sections and oval cross-sections.
  • the radius of curvature of the side portions of the oval cross-section links 50 corresponds to the radius of curvature of the interior of the crowns 52 of the links 48 thereby increasing the area of contact between the faces of adjoining links compared with the arrangement of Figure 7, further varying the dynamic inertia characteristics of the chain lengths.
  • other configurations of the links giving rise to a chain having an enhanced lateral or torsional stiffness are possible and may be selected to give rise to dynamic inertia characteristics appropriate to an envisaged mode of utilisation.
  • chain having enhanced lateral and torsional stiffness may be used in flail chain apparatus having uses other than de-barking and that the invention includes chain for use in chain flail apparatus.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Abstract

Chain flail apparatus, particularly for de-barking felled trees and logs is provided with flail chain lengths attached to a rotable drum. The flail chain lengths are composed of interconnected links of a form enhancing the lateral and torsional stiffness of the chain lengths compared with the lateral and torsional stiffness of conventional form chain links formed with circular cross section crowns and limbs, increasing performance and chain life. The chain links are composed of links (2) having crowns (4) of generally oval cross section. Alternatively limbs of circular or square cross section may be used. Chain lengths with alternating links of different forms also may be used.

Description

Chain flail apparatus and chain lengths therefor
This invention relates to chain flail apparatus and, more particularly, to chain flail apparatus in which lengths of chain are attached at one end to the periphery of a rotatable drum or shaft such as in apparatus for de¬ barking felled trees or logs. The felled trees or logs are guided axially past the rotating drum to be contacted by the flail chains which act to strip away the bark.
Chain of conventional form having links formed with circular cross-section crowns and limbs is utilised in such chain flail apparatus. Such conventional chain is considered to have little or no lateral stiffness and limited torsional stiffness even when in tension.
By the present invention there is provided chain flail apparatus including lengths of chain attached at one end to a rotatable drum or shaft wherein the chain is fabricated with chain links of a form enhancing the lateral and torsional stiffness of the chain lengths compared with the lateral and torsional stiffness of conventional form chain links formed with circular cross-section crowns and limbs.
Preferably, the chain flail apparatus is provided with chain lengths composed of links having limbs and crowns of generally oval cross-section having a greater dimension in a direction perpendicular to a plane axial of the link than in a direction in that plane.
Chain formed with links having crowns and limbs of a non-circular cross-section is disclosed in GB-A-2 200 428, which, in turn makes reference to earlier forms of such chain in other patent specifications. However, this earlier disclosure is concerned with chain utilised in conjunction with chain conveyor installations and is directed toward a chain having a greater tension strength directed toward a chain having a greater tension strength for a given link size. By the nature of the disclosures the dynamics of flail chains are not within the scope of the earlier disclosures.
The invention will now be described, by way of example, with reference to the accompanying drawings in which Figures l to 8 are portions of flail chain lengths indicating alternative configurations of chain links. Cross-sectional views of the links are shown superimposed on the links.
In a flail chain apparatus for de-barking felled trees or logs, chain lengths, approximately seven to nine links long are secured at intervals along and around a rotatable drum. Bolts extending over the length of the drum spaced at equi-angular intervals of 45° or 60° around the drum are secured at intervals through lugs mounted on the periphery of the drum and carry end links of the chain lengths. The drum and chains are contained within the body of the apparatus which includes a surrounding safety hood and guide rollers which are used to guide the logs past the rotating drum.
As shown in Figure 1, the chain length is composed of links 2 having crowns 4 and limbs 6. The crowns and limbs are of approximately constant, generally oval, cross- section, formed as a pair of semi-circles 8 linked by short, straight-line tangents 10. The dimension 12 between the two semi-circles approximates to the dimension 14 between the inner faces of the limbs 6. Typically a clearance of about one millimetre to one and a half millimetres is provided between the abutting faces with, for example, dimension 12 being twenty millimetres and dimension 14 being twenty three millimetres. The effect of making the limbs and crowns of generally oval cross-section and having limited clearance is to increase the lateral and torsional stiffness of the chain length so that there is less freedom of movement of the chain links compared with chain of conventional form. It will be appreciated that when the flail chain is rotated by rotating the central drum at a relatively high speed the resulting centrifugal force puts the chain lengths in tension thereby urging adjoining crown portions into close contact to form a relatively rigid seating and further increases the stiffening effect. This tension is increased when the flail chain contacts the log by virtue of the pull on the chain in contact with the log thereby increasing the force urging adjoining crown portions into close contact and rigidfying the connections between the links. The enhanced stiffness of the chain and the flatter approach of the chain to the log have the effect of imposing a greater traction on the log surface by the chain, thereby enhancing removal of bark and any residual small branches or twigs from the log to achieve an improved performance of the chain flail apparatus as compared with apparatus utilising conventional, circular cross-section crowns and links, chain lengths since adjoining links of such chain are relatively free to pivot the one in relation to the other. It is anticipated that this will lead to a longer chain life compared to the life of chain lengths of conventional form.
A suitable material for the links is a carbon- manganese- boron steel. Alternatively, either case hardened mild steel or alloy steel links may be used.
It will be appreciated that other configurations of links may be utilised to achieve enhancement of the lateral and torsional stiffness of the chain by forming the links with dimensions such that rotation of adjoining links is curtailed or restricted.
Figure 2 shows an arrangement in which the contour of the periphery of the cross-section of the links 16 corresponds to the curvature of the interior of the crowns 18 of the links, thereby producing contact between adjacent face portions of adjoining links. By virtue of the friction forces arising between the contacting faces when the chain length is in tension relative movement between adjoining links is restricted.
Figure 3 shows an arrangement in which the links have an oval cross-section of the crown portions 20 similar to that of Figure 2 but with round cross-section limbs 22, thereby reducing the mass of the link for a given length of link and reducing the inertia of the links when being revolved as flails.
Figure 4 shows an arrangement in which the links have an oval cross-section in crown portions 24 and a circular cross-section in limb portions 26. The oval cross-section has side portions of greater radius of curvature than the radius of curvature of the interior of the crown portions 24 such that a small gap 28 is formed between the interlocking crown portions thereby reducing the area of contact between the faces of adjoining links compared with the arrangement of Figure 3 whilst achieving a greater contact area than in a conventional link arrangement, further varying the dynamic inertia characteristics of the chain length.
Figure 5 shows an arrangement in which the links have an oval cross-section in crown portions 30 and a square cross-section in limb portions 32. The oval cross-section has side portions of a radius of curvature corresponding to the radius of curvature of the interior of the crown portion 30. Such links have a higher mass and dynamic inertia than a conventional link and have a different inertia characteristic from the chain lengths described above. Figure 6 shows an arrangement in which the links have an oval cross-section in crown portions 34 and square cross-section in the limbs 36. The oval cross-section of the crown portions 34 has side portions of a greater radius of curvature than the radius of curvature of the interior of the crown portion 34 such that a small gap 38 is formed intermediate the interlocking crown portions thereby reducing the area of contact between the faces of adjoining links compared with the arrangement of Figure 5 whilst achieving a greater contact area than in a conventional link arrangement, further varying the dynamic inertia characteristics of the chain length.
Figure 7 shows an arrangement utilising a composite chain composed of alternate links 40, 42 respectively having circular cross-sections and oval cross-sections.
The radius of curvature of the side portions of the oval cross-section links 42 is greater than the radius of curvature of the interior of crown portions 44 of the circular cross-section links 40 such that a small gap 46 is formed intermediate the interlocking crown portions. As with the previously described arrangements the dynamic inertia characterisitics of lengths of such chain are different from those of chain lengths of conventional link form.
Figure 8 shows an arrangement utilising a composite chain composed of alternate links 48, 50 respectively having circular cross-sections and oval cross-sections. The radius of curvature of the side portions of the oval cross-section links 50 corresponds to the radius of curvature of the interior of the crowns 52 of the links 48 thereby increasing the area of contact between the faces of adjoining links compared with the arrangement of Figure 7, further varying the dynamic inertia characteristics of the chain lengths. It will be appreciated that other configurations of the links giving rise to a chain having an enhanced lateral or torsional stiffness are possible and may be selected to give rise to dynamic inertia characteristics appropriate to an envisaged mode of utilisation.
It will also be appreciated that, if desired, different configurations of chain links may be utilised over the length of the chain lengths, giving a varying lateral and torsional stiffness and dynamic inertia characteristics over the chain lengths.
It further will be appreciated that chain having enhanced lateral and torsional stiffness may be used in flail chain apparatus having uses other than de-barking and that the invention includes chain for use in chain flail apparatus.

Claims

1. Chain flail apparatus including lengths of chain attached at one end to a rotatable drum or shaft characterised in that the chain is fabricated with chain links of a form enhancing the lateral and torsional stiffness of the chain lengths compared with the lateral and torsional stiffness of conventional form chain links formed with circular cross-section crowns and limbs.
2. Chain flail apparatus as claimed in Claim 1, characterised in that the chain lengths are composed of links having crowns of substantially constant, generally oval, cross-section having a greater dimension in a direction perpendicular to a plane axial of the link than in a direction in that plane.
3. Chain flail apparatus as claimed in Claim 2, characterised in that the generally oval cross-section of the crowns (4,24,34) of the links (2) has a periphery formed by a pair of semi-circles (8) linked by short, straight-line tangents (10) , the greater dimension (12) between the two semi-circles being slightly less than the dimension (14) across the link between the inner faces of the limbs.
4. Chain flail apparatus as claimed in Claim 2, characterised in that the generally oval cross-section of the crowns (18,20,30,52) of the links has a periphery formed by a pair of semi-circles merging with a pair of circular arcs having a curvature generally corresponding to the curvature of the innermost portion of the crowns of the links with the greater dimension between the two sem-circles being slightly less than the dimension across the link between the inner faces of the limbs (16,22,32,48).
5. Chain flail apparatus as claimed in any one of Claims 2 to 4, characterised in that the links (2,16,) have limbs (6) of a cross-sectional form substantially the same as the cross-sectional form of the crowns (4) .
6. Chain flail apparatus as claimed in any one of Claims 2 to 4, characterised in that the links have limbs (22,26) of substantially round cross-sectional form.
7. Chain flail apparatus as claimed in any one of Claims 2 to 4, characterised in that the links have limbs (32,36) of substantially square cross-sectional form.
8. Chain flail apparatus as claimed in Claime 1, characterised in that the chain is a composite chain composed of alternate links (40,42,48,50) respectively having crowns and limbs of circular cross-sections and oval cross-sections.
9. Claim flail apparatus as claimed in Claim 8, characterised in that the radius of curvature of side portions of the oval cross-section links (42) is greater than the radius of curvature of the interior of crown portions (44) of the circular cross-section links (40) such that a small gap (46) is formed intermediate the interlocking crown portions.
10. Chain flail apparatus as claimed in Claim 8, characterised in that the radius of curvature of side portions of the oval cross-section limbs (50) corresponds to the radius of curvature of the interior of the crown portions of the circular cross-section links (48) .
11. Claim flail apparatus as claimed in any preceding claim, characterised in that the chain lengths are arranged to effect de-barking of felled trees or logs.
12. Chain lengths for utilisation in chain flail apparatus as claimed in any preceding claim.
PCT/GB1994/002779 1993-12-21 1994-12-21 Chain flail apparatus and chain lengths therefor WO1995017619A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12772/95A AU1277295A (en) 1993-12-21 1994-12-21 Chain flail apparatus and chain lengths therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939326086A GB9326086D0 (en) 1993-12-21 1993-12-21 Improvements relating to chain flail apparatus
GB9326086.7 1993-12-21

Publications (1)

Publication Number Publication Date
WO1995017619A1 true WO1995017619A1 (en) 1995-06-29

Family

ID=10746958

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/002779 WO1995017619A1 (en) 1993-12-21 1994-12-21 Chain flail apparatus and chain lengths therefor

Country Status (4)

Country Link
AU (1) AU1277295A (en)
GB (1) GB9326086D0 (en)
WO (1) WO1995017619A1 (en)
ZA (1) ZA9410178B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406411B (en) * 1999-03-02 2000-05-25 Pewag Austria Gmbh Forestry chain
GB2373560A (en) * 2001-03-23 2002-09-25 Parsons Chain Company Ltd Chain having a particular profile
CN104343891A (en) * 2014-10-06 2015-02-11 上海工程技术大学 Circular ring chain as well as flattening die and flattening technology for producing chain
WO2018136104A1 (en) * 2017-01-23 2018-07-26 Astec Industries, Inc. Flail chain link with polygonal cross-section

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE200383C (en) *
GB891172A (en) * 1959-05-06 1962-03-14 Keith Donald Elwick Material unloading implements
US3862653A (en) * 1974-02-08 1975-01-28 Clinton K Fay Log debarking apparatus
GB2200428A (en) * 1986-11-27 1988-08-03 Wheway Becker Ltd Chain
GB2222654A (en) * 1988-07-06 1990-03-14 Wheway Becker Ltd Chain block assembly
US4947906A (en) * 1987-12-01 1990-08-14 H L & H Timber Products Debarker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE200383C (en) *
GB891172A (en) * 1959-05-06 1962-03-14 Keith Donald Elwick Material unloading implements
US3862653A (en) * 1974-02-08 1975-01-28 Clinton K Fay Log debarking apparatus
GB2200428A (en) * 1986-11-27 1988-08-03 Wheway Becker Ltd Chain
US4947906A (en) * 1987-12-01 1990-08-14 H L & H Timber Products Debarker
GB2222654A (en) * 1988-07-06 1990-03-14 Wheway Becker Ltd Chain block assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406411B (en) * 1999-03-02 2000-05-25 Pewag Austria Gmbh Forestry chain
GB2373560A (en) * 2001-03-23 2002-09-25 Parsons Chain Company Ltd Chain having a particular profile
GB2373560B (en) * 2001-03-23 2005-04-20 Parsons Chain Company Ltd Chains
CN104343891A (en) * 2014-10-06 2015-02-11 上海工程技术大学 Circular ring chain as well as flattening die and flattening technology for producing chain
WO2018136104A1 (en) * 2017-01-23 2018-07-26 Astec Industries, Inc. Flail chain link with polygonal cross-section

Also Published As

Publication number Publication date
GB9326086D0 (en) 1994-02-23
AU1277295A (en) 1995-07-10
ZA9410178B (en) 1995-08-02

Similar Documents

Publication Publication Date Title
US5092822A (en) Low-noise chain and chain power transmission apparatus using the low-noise chain
EP1996838B1 (en) Chain noise reduction device
US5064042A (en) Torsionally elastic clutch
WO1995017619A1 (en) Chain flail apparatus and chain lengths therefor
CA1100784A (en) Sprocket drum assembly
US4276041A (en) Chain for friction pulley transmission
NZ208057A (en) Studded chain link with waisted central portion
US5803851A (en) Chain drive with sectional steel chain
US5520583A (en) Governor drive pulley
US20100279805A1 (en) Power transmission chain and power transmission system
JP2002340103A (en) Chain belt for cvt
CA1074716A (en) Portable power chain-saw
EP0109556B1 (en) Trapezoidal force transmitting elements for driving belts
US2885870A (en) Torque transmitting device
US20020151399A1 (en) Compression belt for CVT having a crowned strut edge wherein the radius is determined by the maximum allowable contact stress and is located so that the contact point remains close to the rocking radius of the struts
US4804353A (en) Sprocket wheel
EP0738202B1 (en) Chain saw drive sprocket device
SU1184760A1 (en) Belt conveyer drum
WO1997001422A1 (en) Nose sprocket for chain saw guide bars
JPS5917043A (en) Wrapping connecting type power transmission device
SU1657442A1 (en) Track chain
SU677980A1 (en) Endless-track chain hinge
KR100228616B1 (en) Flexible coupling buffer and method of their production
SU672080A1 (en) Energy-absorbing device
SU972080A1 (en) Working member of coal cutter-loader

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BR CA CN DE ES FI GB RU SE UA US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: CA