WO2001024981A1 - Dispositif de mors pour operateurs de scie a chaine - Google Patents

Dispositif de mors pour operateurs de scie a chaine Download PDF

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Publication number
WO2001024981A1
WO2001024981A1 PCT/AU2000/001171 AU0001171W WO0124981A1 WO 2001024981 A1 WO2001024981 A1 WO 2001024981A1 AU 0001171 W AU0001171 W AU 0001171W WO 0124981 A1 WO0124981 A1 WO 0124981A1
Authority
WO
WIPO (PCT)
Prior art keywords
log
jaw
supports
jaws
upper jaw
Prior art date
Application number
PCT/AU2000/001171
Other languages
English (en)
Inventor
Stafford James Ray
Original Assignee
Stafford James Ray
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 Stafford James Ray filed Critical Stafford James Ray
Priority to AU77629/00A priority Critical patent/AU7762900A/en
Publication of WO2001024981A1 publication Critical patent/WO2001024981A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/0041—Saw benches or saw bucks
    • B27B17/0075—Saw benches or saw bucks the workpiece being held in a cantilever manner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B21/00—Hand saws without power drive; Equipment for hand sawing, e.g. saw horses

Definitions

  • the present invention relates to chain-sawing and, in particular, to a jaw device for chainsaw operators.
  • Chainsaws are widely used to cut logs, mainly but not exclusively, for firewood.
  • the object of the present invention is to provide a jaw device for chainsaw operators which achieves a number of ends.
  • the chainsaw is able to be held at a comfortable height so that the chainsaw operator does not have a bent back, thereby both keeping the blade of the chainsaw free of any obstruction and also overcoming fatigue in the operator.
  • the operator is able to cut progressively from one end of the log to the other without having to adjust the apparatus between cuts.
  • the final piece cut to length should preferably fall to the ground without having to be manually extracted from the device.
  • a jaw device for holding a log to be chain-sawed substantially transverse to the longitudinal axis of the log, said device comprising a pair of spaced apart generally vertically extending supports, an upper jaw having downwardly directed protrusions and extending between said supports, a lower jaw having upwardly directed protrusions and extending between said supports at a level below said upper jaw to thereby define a log receiving mouth between said jaws to receive said log with said longitudinal axis thereof generally perpendicular both to said jaws and to said supports.
  • a method of chain- sawing a length of log comprising the steps of wedging one end of said log in the jaws of the abovementioned device, and making a sequence of cuts through said log starting at its other end and working towards said one end.
  • FIG. 1 is a perspective view of a first prior art chain-sawing method
  • Fig. 2 is a perspective view of second prior art chain-sawing apparatus and method
  • Fig. 3 is a perspective view of the apparatus of the preferred embodiment showing a sequence of cuts underway
  • Fig. 4 is a perspective view similar to Fig. 3 but illustrating the last cut of the sequence
  • Fig. 5 is a perspective view of the sub-components of the apparatus of the preferred embodiment shown in knock-down form prior to assembly,
  • Fig. 6 is a perspective view showing the insertion of the feet into the base of the supports
  • Fig. 7 is a partial front elevation showing the arrangement of the jaws of the first embodiment
  • Fig. 8 is a view similar to Fig. 7 but illustrating the jaws of the second embodiment
  • Fig. 9 is a view similar to Fig. 8 but illustrating the jaws of the third embodiment
  • Fig. 10 is a schematic side elevation illustrating an unsawn log and the location of the various intended cuts
  • Fig. 11 is a view similar to Fig. 10 but illustrating all cuts made but the last cut
  • Fig. 12 is a side elevation similar to Figs. 10 and 11 but illustrating the consequence of the last cut.
  • the operator 1 holds the chainsaw 2 so as to cut a length of log 3.
  • the far end 4 of the log 3 rests on the ground whilst the near end 5 of the log 3 is supported by a cut length 6.
  • Three previously cut lengths 7 lie on the ground and a currently cut length 8 is in the process of being sawn.
  • the cut length 6 is generally cylindrical, the length of log 3 is liable to roll on the cut length 6 and this represents a hazard for the operator 1.
  • Fig. 2 illustrates a form of timber workhorse 11 which supports the length of log 3 to be sawn by balancing the log 3. Whilst this raises the height of the log 3, and thus permits the operator 1 to saw without a bent back, it is necessary for the operator to saw a cut length 16 from one end and a cut length 17 from the other end in alternative fashion so as to maintain the balance of the log 3 on the workhorse 11. This means it is necessary for the operator 1 to walk from one end of the workhorse 11 to the other between each cut. This considerably increases operator fatigue.
  • the device 20 is formed from a pair of spaced apart supports 21, 22 which are interconnected by means of an upper jaw 23 having downwardly directed teeth 24 and a lower jaw 25 having upwardly directed teeth 26.
  • the jaws 23, 25 and supports 21, 22 are bolted together.
  • At the base of each of the supports 21, 22 is a length of tube 27 of rectangular cross-section into which is slidingly received one of two feet 28, 29. This is illustrated in Fig. 6. If desired, one end of each foot 28, 29 can be provided with a stop 30 in the form of a flange which prohibits further sliding through the tube 27.
  • the jaw device 20 can be sold in knock-down form and erected where required to be used. Furthermore, in the erected form, as illustrated in Figs. 3 and 4, the feet 28, 29 can be slid out from the tubes 27. The thus partially disassembled device can then be located in the boot (or trunk) of a motor vehicle so as to be taken to the location where the chain sawing is to take place.
  • the lower jaw 25 is provided with a series of arcuate bights 33 which thus create cusp-shaped teeth 26.
  • the teeth 26 on the lower jaw 25 are substantially V-shaped and are similar to the teeth 24 on the upper jaw 23 but preferably vary in size to better hold logs of different sizes and shapes.
  • the teeth 24, 26 are substantially rectangular and are arranged to hold sawn lengths of timber.
  • Figs. 10-12 the cutting sequence of the preferred embodiment is illustrated in detail.
  • the unsawn log 3 is wedged between the upper jaw 23 and lower jaw 25 and has a relatively large mass M.
  • Mg the acceleration due to gravity.
  • the force of gravity creates a torque which drives the uncut log 3 both upwardly into the teeth 24 of the upper jaw 23 and downwardly into the teeth 26 of the lower jaw 25.
  • This firmly wedges the log 3 in the jaw device 20 and holds it steady.
  • the long feet 28, 29 easily resist torque applied to the jaw device 20.
  • Fig. 10 illustrates the approximate locations of the sequence of cuts 35, 36, 37 etc. which are made so as to produce cut lengths 45, 46, 47 etc. as illustrated in Fig. 11.
  • the centre of gravity moves towards the support 22.
  • the position is as illustrated in Fig. 11 where the uncut log 3 now has a smaller mass m but its centre of gravity is still located on the same side of the lower jaw 25 as the feet 28, 29.
  • the centre of gravity of the last cut length 49 is located to the left of the lower jaw 25 as seen in Fig. 12.
  • the last cut length 49 falls from the jaw device 20.
  • the last cut be made from the right hand side of the log 3 as viewed from the front of the jaw device 20 and as illustrated in Fig. 4.
  • the jaws 23, 24 can be attached either to the outside of the supports 21, 22 as illustrated, or can be reversed and secured to the inside of the supports 21, 22 as illustrated in Figs. 8 and 9.
  • This has the advantage of allowing the chain saw 2 to cut closer to the jaw 25.
  • the stop 30 instead of being a flange as illustrated, can take the form of pressed dimples which at low cost perform the same operation.

Landscapes

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

Abstract

La présente invention concerne un dispositif de mors (20) pour le maintien de billes (3) à être sciées au moyen d'un scie à chaîne. Le dispositif présente une embouchure constituée d'un mors supérieur (23) et d'un mors denté inférieur du côté opposé (25). L'embouchure est maintenue (21, 22) au-dessus d'une paire de pieds (28, 29). La bille (3) peut être progressivement sciée à partir de son extrémité libre (45) en direction de l'extrémité maintenue dans l'embouchure. L'espacement entre les mors dans la direction de l'axe longitudinal de la bille (3) permet de maintenir solidement la bille et la dernière coupe libère l'extrémité (49) maintenue de la bille (3) du dispositif.
PCT/AU2000/001171 1999-10-01 2000-09-27 Dispositif de mors pour operateurs de scie a chaine WO2001024981A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU77629/00A AU7762900A (en) 1999-10-01 2000-09-27 A jaw device for chainsaw operators

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ3227A AUPQ322799A0 (en) 1999-10-01 1999-10-01 Workholding jaw
AUPQ3227 1999-10-01

Publications (1)

Publication Number Publication Date
WO2001024981A1 true WO2001024981A1 (fr) 2001-04-12

Family

ID=3817390

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2000/001171 WO2001024981A1 (fr) 1999-10-01 2000-09-27 Dispositif de mors pour operateurs de scie a chaine

Country Status (2)

Country Link
AU (1) AUPQ322799A0 (fr)
WO (1) WO2001024981A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013175175A1 (fr) * 2012-05-22 2013-11-28 Forest Master Ltd Appareil de maintien de grume
CN110108468A (zh) * 2019-05-24 2019-08-09 东北林业大学 一种搅拌式锯链疲劳试验装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2098922A (en) * 1981-05-26 1982-12-01 Vaizey Geoffrey Stuart Device for holding logs for sawing
EP0206617A2 (fr) * 1985-06-10 1986-12-30 Arthur J. Hopkins Porteur de grume
GB2227201A (en) * 1988-12-22 1990-07-25 Geoffrey Frederick King A saw horse
RU2113348C1 (ru) * 1997-01-22 1998-06-20 Вадим Леонидович Калинин Устройство для ручной распиловки и обработки длинномерного материала
WO1999055504A1 (fr) * 1998-04-15 1999-11-04 Nils Tallving Dispositif de support de pieces de bois

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2098922A (en) * 1981-05-26 1982-12-01 Vaizey Geoffrey Stuart Device for holding logs for sawing
EP0206617A2 (fr) * 1985-06-10 1986-12-30 Arthur J. Hopkins Porteur de grume
GB2227201A (en) * 1988-12-22 1990-07-25 Geoffrey Frederick King A saw horse
RU2113348C1 (ru) * 1997-01-22 1998-06-20 Вадим Леонидович Калинин Устройство для ручной распиловки и обработки длинномерного материала
WO1999055504A1 (fr) * 1998-04-15 1999-11-04 Nils Tallving Dispositif de support de pieces de bois

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class P63, AN 1999-631988/54 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013175175A1 (fr) * 2012-05-22 2013-11-28 Forest Master Ltd Appareil de maintien de grume
CN110108468A (zh) * 2019-05-24 2019-08-09 东北林业大学 一种搅拌式锯链疲劳试验装置

Also Published As

Publication number Publication date
AUPQ322799A0 (en) 1999-10-28

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