GB2557685A - An attachment for a chainsaw - Google Patents

An attachment for a chainsaw Download PDF

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Publication number
GB2557685A
GB2557685A GB1621393.6A GB201621393A GB2557685A GB 2557685 A GB2557685 A GB 2557685A GB 201621393 A GB201621393 A GB 201621393A GB 2557685 A GB2557685 A GB 2557685A
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GB
United Kingdom
Prior art keywords
bar
chainsaw
connecting bar
attachment
bearing
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.)
Withdrawn
Application number
GB1621393.6A
Other versions
GB201621393D0 (en
Inventor
Francis Byrne Martin
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1621393.6A priority Critical patent/GB2557685A/en
Publication of GB201621393D0 publication Critical patent/GB201621393D0/en
Priority to PCT/EP2017/077031 priority patent/WO2018108366A1/en
Publication of GB2557685A publication Critical patent/GB2557685A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q9/00—Arrangements for supporting or guiding portable metal-working machines or apparatus
    • B23Q9/0014—Portable machines provided with or cooperating with guide means supported directly by the workpiece during action
    • B23Q9/0021—Portable machines provided with or cooperating with guide means supported directly by the workpiece during action the tool being guided in a circular path
    • 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
    • B27B17/0083—Attachments for guiding or supporting chain saws during operation

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

Abstract

An attachment 10 for a chainsaw (40, Fig 2) has an elongate body section 11 with a top plate 12 and two walls 13, 14 and a connecting bar 17 rotatably mounted on elongate body section 12 which may have a threaded inside to connect with the bar stud of a chainsaw, such that, in use, the chainsaw (40, Fig 2) moves parallel to guide rail (44, Fig 2) and is rotatable around the longitudinal axis of connecting bar 17. A distal end (42, Fig 2), of connecting bar 17 may have another threaded opening of different size so that it may connect with another sized bar stud. The connecting bar 17 may further by mounted within a bearing 21, such that the bar may slide within it. The bar 17 may also be threaded externally 26 so that it can wind within bearing 21, and may include a lock nut 27, 28 on both sides of the bearing 21 to lock bar 17 in place. An index mark 29 may be placed on lock nut 27, 28 to indicate the amount of adjustment. A jacking screw 31 may be included on the base of the bearing 21 so as to tilt the bearing to allow a chainsaw (40, Fig 2) in use to cut at angles other than 90 degrees. One of the walls 13 may also be adjustably attached to the body 11 such that different guide rails may be accommodated.

Description

(71) Applicant(s):
Martin Francis Byrne
Humphreystown, Blessington, County Wicklow, Ireland (72) Inventor(s):
Martin Francis Byrne
1621393.6 (51) INT CL:
B27B 17/00 (2006.01) B23Q 9/02 (2006.01)
15.12.2016 (56) Documents Cited:
US 6192592 B1 US 4476759 A US 3864830 A
US 4726274 A US 4388762 A US 3051203 A (58) Field of Search:
INT CL B23Q, B27B, B27G Other: EPODOC, INTERNET, WPI (74) Agent and/or Address for Service:
Anne Ryan & Co
Crofton Terrace, Dun Laoghaire, County Dublin, A96 V6P7, Ireland (54) Title of the Invention: An attachment for a chainsaw
Abstract Title: Rotating guide rail attachment for chain saw (57) An attachment 10 for a chainsaw (40, Fig 2) has an elongate body section 11 with a top plate 12 and two walls 13, 14 and a connecting bar 17 rotatably mounted on elongate body section 12 which may have a threaded inside to connect with the bar stud of a chainsaw, such that, in use, the chainsaw (40, Fig 2) moves parallel to guide rail (44, Fig 2) and is rotatable around the longitudinal axis of connecting bar 17. A distal end (42, Fig 2), of connecting bar 17 may have another threaded opening of different size so that it may connect with another sized bar stud. The connecting bar 17 may further by mounted within a bearing 21, such that the bar may slide within it. The bar 17 may also be threaded externally 26 so that it can wind within bearing 21, and may include a lock nut 27, 28 on both sides of the bearing 21 to lock bar 17 in place. An index mark 29 may be placed on lock nut 27, 28 to indicate the amount of adjustment. A jacking screw 31 may be included on the base of the bearing 21 so as to tilt the bearing to allow a chainsaw (40, Fig 2) in use to cut at angles other than 90 degrees. One of the walls 13 may also be adjustably attached to the body 11 such that different guide rails may be accommodated.
1/2
Fig. 1
2/2
Fig. 2
An attachment for a chainsaw
This invention relates to an attachment for a chainsaw and, in particular, to an attachment for a chainsaw for use in the cutting of planks, beams and boards from logs.
Chainsaws have been used for many years for cutting logs and rough slabs of wood into planks, beams and boards. The chainsaw must be supported in some way so that straight, planar cuts can be made in a log. Thus, various attachments have been designed so as to support the chainsaw during cutting operations so as to produce smooth cuts and linear pieces.
US Patent No. 4,146,962 describes an apparatus for guiding the cutting of wood by a chain saw which includes a chain saw bar, which apparatus comprises a pair of guide members and a plurality of spacer members. The apparatus is attached to the chain saw bar by a bolt, which passes through a pre-drilled hole in the chain saw bar. At least one of the guide members includes means for following a guide surface to maintain the chain saw bar parallel thereto. The chain saw is held in a vertical disposition.
A disadvantage of the apparatus described in US Patent No.
4,146,962 is that a hole has to be drilled in the chain saw bar to accommodate the attachment bolt. Furthermore, although it is possible to adjust the size of a plank to be cut, in order to so do, the apparatus has to be disassembled and the spacer bars have to be rearranged. This operation is time consuming and individual parts of the apparatus can be misplaced during the adjustment operation.
US Patent No. 4,244,104 describes a device for guiding the cutting action of a chain saw which includes a chain saw bar, which device comprises a mill frame having a pair of longitudinally spaced, parallel members joined by a plurality of rod-like runners extending orthogonally therebetween and joined to the lower surfaces thereof. A chain saw bar may be secured subjacent to the mill frame and selectively spaced therefrom by a pair of bolts extending through the chain saw bar to the mill frame, and a plurality of tubular spacer members secured on each bolt between the bar and the mill frame. The runners of the mill frame ride on a plank secured on a log or on a previously cut surface to guide the chain saw in making planar, longitudinal cuts through a log. The chain saw can be used in a horizontal or in a vertical disposition.
A disadvantage of the apparatus described in US Patent No.
4,244,104 is that a hole has to be drilled in the chain saw bar to accommodate each attachment bolt. Furthermore, assembly of the device, attachment of the chain saw thereto, and adjustment for a particular task is complicated and time consuming.
US Patent No. 3,864,830 describes a lumber sawing attachment for a chain saw and includes a U-shaped clamp which is secured by a set of screws to the cutter bar. The clamp has a slot for receiving the cutter bar and an enlarged slot bottom to provide clearance for the cutting chain. The clamp is fixed to an axle which is rotatably supported on a guide bracket which is adapted for longitudinal movement along a guide member, such as a board fastened to the upper surface of a log. The axle can be tightened in selected adjusted positions to maintain the saw rigidly with respect to the guide bracket and log to assist starting and sharpening of the saw, to control the depth of cut and hold the cutter bar at an efficient sawing position.
A lumber sawing attachment, as described in US Patent No. 3,864,830 is commercially available from Haddon Tools of Traverse City, MI, 49685, U.S.A., as the Haddon Lumber Maker. The attachment is light in weight at just 1.81 kilos. It is designed to use a 35mm x 90mm or a 35mm x 120mm plank to act as a guide member. A disadvantage of this is that the attachment will tend to come off the guide member if any resistance to the cutting action of the chain saw is met with, during use. This problem is accentuated as the attachment is clamped to the chain saw blade forward of the centre of gravity of the chain saw. Thus, in a rotational kickback event, the chain saw and the sawing attachment will rotate backwards towards the user in the same way that an unattached chainsaw would behave.
It is an object of the present invention to overcome the disadvantages of the chainsaw attachments hereinbefore described.
Thus, the invention provides an attachment for a chainsaw of the type which employs one or more bar studs on the body of the chainsaw to which the chain bar is attached, which attachment facilitates the cutting of planks, beams and boards from a log by tracking along a guide rail, and which attachment comprises an elongate body section having a top plate, a wall to each long side and suspended therefrom, which elongate body section is dimensioned to be a snug fit on the guide rail, in use, a connecting bar rotatably mounted on the top plate and extending to one side of the body section, and means for attaching the connecting bar to a stud bar on the chainsaw, which attachment means is located at the end of the connecting bar to which the chainsaw is attachable, such that, in use, the chainsaw moves parallel to the guide rail and is rotatable around the longitudinal axis of the connecting bar.
An advantage of the attachment according to the invention is that, as the chainsaw is attached to the end of the connecting bar, it may be operated with both hands on the handles, with the user standing to one side of the chain bar. This arrangement means that the chain brake will be activated in the event of kickback.
Furthermore, since the chainsaw is free to rotate around the longitudinal axis of the connecting bar the chainsaw will rotate relative to the attachment in the event of kickback, and the attachment will be less likely to detach from the guide rail.
A further advantage of the attachment according to the invention is that, as the connecting bar attaches to the stud bar, this attachment point is near to the centre of gravity of the chainsaw, which results in the chainsaw being well balanced, while in use.
Preferably, the attachment means is a threaded opening in the end of the connecting bar, which matches the thread on the bar stud.
An advantage of attaching the connecting bar using the threaded opening in the end thereof is that the connecting bar once connected will be perpendicular to the chain bar.
A further advantage of this feature of the invention is that the only part of the attachment between the body section and the attachment point on the chainsaw is the connecting bar. Thus, the user has a clear view of the chainsaw and of the log being sawn, as a plank, beam or board is being cut from the log.
Further, preferably, the other end of the connecting bar has a threaded opening for attaching the connecting bar to an alternatively sized bar bolt, with the connecting bar being reversibly mountable on the top plate.
An advantage of this arrangement is that the attachment is suitable for use with chainsaws having alternatively sized bar bolts. Thus, changing from a chainsaw with one size bar bolt to a second chainsaw with a different sized bar bolt is just a matter of reversing the connecting bar within the bearing housing.
In one embodiment of the invention, a bearing is mounted on the top plate, through which bearing the connecting bar is slidably mounted.
An advantage of using a bearing to house the connecting bar is that the connecting bar will turn in a smooth fashion.
In a further embodiment of the invention, the connecting bar has an external thread and a locking nut located on the connecting bar to each side of the bearing, such that the distance of the chainsaw from the bearing may be adjusted.
An advantage of this arrangement is that the width of a plank to be cut can be set on the attachment by slackening off the locking nuts to set the correct distance of the chainsaw from the body section.
Preferably, an index mark is placed on of the locking nuts for indicating the amount of adjustment made to the distance of the chainsaw from the bearing.
An advantage of this arrangement is that the change in the distance can be indexed to the number of turns of the locking nut on the connecting bar.
In a further embodiment of the invention, the bearing is located in a bearing housing, which bearing housing is attached to the top plate by a pair of screws, with the orientation of the connecting bar being adjustable relative to the longitudinal axis of the elongate body unit before the screws are tightened.
An advantage of this adjustment method is that the chainsaw can be aligned to the guide rail so that the width of the plank being cut will not vary as the attachment moves along the guide rail.
Preferably, a jacking screw is mounted in the bearing housing, the 5 rotation of which tilts the connecting bar for alignment of the attached chainsaw to the log.
An advantage of the jacking screw is that the orientation of the chainsaw bar can be adjusted so that the width of the plank is the same at each side of the plank.
In a further embodiment of the invention, one of the walls of the elongate body section is adjustably suspended from the top plate for accommodating guide rails of different widths.
An advantage of this adjusting mechanism is that where a new guide rail is being used the gap between the walls can be adjusted to allow the body section to move smoothly along the guide rail.
The invention will be further illustrated by the following description of an embodiment thereof, given by way of example only with reference to the accompanying drawings in which:
Fig. 1 is a perspective view from above and to one side of an 20 attachment for a chainsaw in accordance with the invention; and
Fig. 2 is a view of the attachment of Fig. 1 connected to a chainsaw and with the connecting bar reversed.
Referring to Fig. 1, there is illustrated generally at 10, an attachment in accordance with the invention for a chainsaw of the type which employs one or more bar studs on the body of the chainsaw to which the chain bar is attached, which attachment facilitates the cutting of planks, beams and boards from a log by tracking along a guide rail. The attachment 10 comprises an elongate body section 11, having a top plate 12 and a wall 13, 14 to each long side 15, 16, respectively and suspended therefrom. The body section 11 is dimensioned to be a snug fit on the guide rail (not shown), in use, and a connecting bar 17 is rotatably mounted on the top plate 12 at position 18, which connecting bar 17 extends to each side 19, 20 of the body section 11.
The connecting bar 17 is rotatably mounted in a pair of RMS-615 2RS bearings 21 (second bearing not shown), which bearings 21 are held in a bearing housing 22, and which housing is fixed to the top plate 12 by angle irons 23, 24, with cap screws 25 (one shown). In use, while the cap screws 25 are loose, the orientation of the connecting bar 12 is adjustable relative to the longitudinal axis of the elongate body unit
11 followed by tightening of the cap screws 25.
The connecting bar 17 has an external thread 26 and a locking nut 27, 28, located on the connecting bar 17 to each side of the bearing housing 22 such that, in use, the distance of the chainsaw from the bearings 21 may be adjusted. An index mark 29 on locking nut 27 indicates the amount of adjustment made to the distance of the chainsaw from the bearings 21. One turn of locking nut 27 represents 2.5mm. Thus, ten turns of the locking nut 27 will shift the chainsaw left or right by 25 mm.
Side wall 14 is permanently fixed to the top plate 12, while side wall 13 is fixed to the top plate 12 by a set of side wall screws 30, which allow the distance between side walls 13, 14 to be adjusted for accommodating guide rails of different widths.
A jacking screw 31 mounted in angle iron 23 at position 32, is used to tilt the connecting bar 17 for alignment of the attached chainsaw to the log, in use.
A threaded opening 33 is located at end 34 of the connecting bar 17, which threaded opening 33 matches the thread on a bar stud (not shown) on the chainsaw, such that the attachment 10 is connectable to the bar stud (not shown), in use, and the attached chainsaw, when sawing, moves parallel to the guide rail and is rotatable around the longitudinal axis of the connecting bar 17. Milled slots 35 (one shown) are used for tightening the connecting bar 17 to the bar stud with a spanner.
A handle 36 is mounted on the top plate 12 at position 37 and is only used for handling the attachment 10, while sawing is not in progress. The handle 36 is not used while the chainsaw is sawing, as the attachment will travel along the guiderail, unassisted, due to the sawing action of the chainsaw.
The elongate body unit 11 is made of plate steel and the bearing housing 22, angle irons 23, 24 and handle 36 are manufactured from steel. The connecting bar 17 is made from a threaded zinc-plated bar.
Referring to Fig. 2, attachment 10 is illustrated attached to a chainsaw 40. The connecting bar 17 has been reversed within the bearing housing 22 and has been tightened onto a bar stud 41 on the chainsaw 40 using the threaded opening 33 located at end 34 of connecting bar 17, which threaded opening 33 matches the thread on a bar stud 41.
A second threaded opening 42, located at other end 43 of the connecting bar 17, accommodates a different size bar stud.
A wooden guide rail 44 has been aligned with the longitudinal axis 15 of a log 45 and the distance between the chainsaw 40 and the bearing housing 22 has been adjusted to provide a sawn plank of a particular width. The alignment of the chain bar to the log 45 is fine tuned by adjusting the position of the bearing housing 22 relative to the elongate body unit 11, as hereinbefore described. Depending on the thickness of the planks to be cut a number may be cut by adjusting the distance of the chainsaw 40 from the bearing housing 22 after the completion of each plank. This adjustment is accomplished quite easily.
When it becomes necessary to move the guide rail 44 it is unscrewed and repositioned as described above.

Claims (10)

  1. Claims: 1. An attachment for a chainsaw of the type which employs one or more bar studs on the body of the chainsaw to which the chain bar is attached, which attachment facilitates the cutting of planks, beams and
    5 boards from a log by tracking along a guide rail, and which attachment comprises an elongate body section having a top plate, a wall to each long side and suspended therefrom, which elongate body section is dimensioned to be a snug fit on the guide rail, in use, a connecting bar rotatably mounted on the top plate and extending to one side of the body
    10 section, and means for attaching the connecting bar to a stud bar on the chainsaw, which attachment means is located at the end of the connecting bar to which the chainsaw is attachable, such that, in use, the chainsaw moves parallel to the guide rail and is rotatable around the longitudinal axis of the connecting bar.
    15
  2. 2. An attachment according to Claim 1, wherein the attachment means is a threaded opening in the end of the connecting bar, which matches the thread on the bar stud.
  3. 3. An attachment according to Claim 1 or 2, wherein the other end of the connecting bar has a threaded opening for attaching the
    20 connecting bar to an alternatively sized bar bolt, with the connecting bar being reversibly mountable on the top plate.
  4. 4. An attachment according to Claim 3, wherein a bearing is mounted on the top plate, through which bearing the connecting bar is slidably mounted.
  5. 5. An attachment according to Claim 4, wherein the
    5 connecting bar has an external thread and a locking nut located on the connecting bar to each side of the bearing, such that the distance of the chainsaw from the bearing may be adjusted.
  6. 6. An attachment according to Claim 5, wherein an index mark is placed on of the locking nuts for indicating the amount of adjustment
    10 to the distance of the chainsaw from the bearing.
  7. 7. An attachment according to any one of Claims 4 to 6, wherein the bearing is located in a bearing housing, which bearing housing is attached to the top plate by a pair of screws, with the orientation of the connecting bar being adjustable relative to the
    15 longitudinal axis of the elongate body unit before the screws are tightened.
  8. 8. An attachment according to Claim 7, wherein a jacking screw is mounted in the bearing housing, the rotation of which tilts the connecting bar for alignment of the attached chainsaw to the log.
    20
  9. 9. An attachment according to any preceding claim, wherein one of the walls of the elongate body section is adjustably suspended from the top plate for accommodating guide rails of different widths.
  10. 10. An attachment for a chainsaw according to Claim 1 of the type which employs one or more bar studs on the body of the chainsaw to which the chain bar is attached, which attachment facilitates the cutting of planks, beams and boards from a log by tracking along a guide
    5 rail, substantially as hereinbefore described with particular reference to and as illustrated in the accompanying drawings.
    Intellectual
    Property
    Office
    Application No: GB1621393.6 Examiner: Mr Alex Gillam
GB1621393.6A 2016-12-15 2016-12-15 An attachment for a chainsaw Withdrawn GB2557685A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1621393.6A GB2557685A (en) 2016-12-15 2016-12-15 An attachment for a chainsaw
PCT/EP2017/077031 WO2018108366A1 (en) 2016-12-15 2017-10-23 An attachment for a chainsaw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1621393.6A GB2557685A (en) 2016-12-15 2016-12-15 An attachment for a chainsaw

Publications (2)

Publication Number Publication Date
GB201621393D0 GB201621393D0 (en) 2017-02-01
GB2557685A true GB2557685A (en) 2018-06-27

Family

ID=58284313

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1621393.6A Withdrawn GB2557685A (en) 2016-12-15 2016-12-15 An attachment for a chainsaw

Country Status (2)

Country Link
GB (1) GB2557685A (en)
WO (1) WO2018108366A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3051203A (en) * 1959-12-28 1962-08-28 Ernest A Hayden Lumber saw attachment for chain saws
US3864830A (en) * 1973-02-28 1975-02-11 Jesse E Haddon Lumber making attachment for a chain saw
US4388762A (en) * 1981-08-05 1983-06-21 Debell Jr John H Chain saw measuring device
US4476759A (en) * 1982-03-03 1984-10-16 Aderneck Stephen E Portable chainsaw milling guide attachment
US4726274A (en) * 1986-01-10 1988-02-23 Beniamino Pitoni Mitering device
US6192592B1 (en) * 1999-08-06 2001-02-27 Dare Russell Zimmerman Cutting guide device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117316A (en) * 1982-03-23 1983-10-12 John David Keld Fenwick Chain saw cutting guide
US20150096417A1 (en) * 2013-10-07 2015-04-09 Vito Peter Brancaccio Apparatus and method for operating a power saw

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3051203A (en) * 1959-12-28 1962-08-28 Ernest A Hayden Lumber saw attachment for chain saws
US3864830A (en) * 1973-02-28 1975-02-11 Jesse E Haddon Lumber making attachment for a chain saw
US4388762A (en) * 1981-08-05 1983-06-21 Debell Jr John H Chain saw measuring device
US4476759A (en) * 1982-03-03 1984-10-16 Aderneck Stephen E Portable chainsaw milling guide attachment
US4726274A (en) * 1986-01-10 1988-02-23 Beniamino Pitoni Mitering device
US6192592B1 (en) * 1999-08-06 2001-02-27 Dare Russell Zimmerman Cutting guide device

Also Published As

Publication number Publication date
WO2018108366A1 (en) 2018-06-21
GB201621393D0 (en) 2017-02-01

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)