EP0092564A1 - Tronconneuse amelioree - Google Patents

Tronconneuse amelioree

Info

Publication number
EP0092564A1
EP0092564A1 EP19820903278 EP82903278A EP0092564A1 EP 0092564 A1 EP0092564 A1 EP 0092564A1 EP 19820903278 EP19820903278 EP 19820903278 EP 82903278 A EP82903278 A EP 82903278A EP 0092564 A1 EP0092564 A1 EP 0092564A1
Authority
EP
European Patent Office
Prior art keywords
raker
kerf
tooth
chain
depth gauge
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Withdrawn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
EP19820903278
Other languages
German (de)
English (en)
Inventor
Douglas J. Lemery
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.)
LEMERY-KOLVE CHAIN Co
Original Assignee
LEMERY-KOLVE CHAIN Co
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 LEMERY-KOLVE CHAIN Co filed Critical LEMERY-KOLVE CHAIN Co
Publication of EP0092564A1 publication Critical patent/EP0092564A1/fr
Withdrawn legal-status Critical Current

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
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains
    • B27B33/141—Saw chains with means to control the depth of cut

Definitions

  • the present invent ion re lates to an improved chain for a chain saw, particularly including a novel tooth including a laterally depth gauge.
  • the tendency to dig in is created because the depth gauge tends to run at the low point of the kerf rather than at a constant depth equal to the depth at which the side cutter element runs while scoring the kerf .
  • the raker tooth makes cutt ing rougher, increases the tendency of the saw to kick , and reduces control for the saw. Taking too large a chip re ⁇ quires greater power to drive the saw chain with the conse- quent production of a greater amount of heat in cutting .
  • raker teeth of the design of United States Patent 3 ,745,870 have a tendency to rock in the kerf, thereby lead ⁇ ing to crooked cuts as the chain runs in the kerf , .especial ⁇ ly in angular cutting at an acute angle to the grain .
  • the rocking tendency is generated by the rakers taking ch ips of different, dimension, causing different slant angles for the chain in the kerf . Therefore , improvements are poss ible by provid ing a cha in wh ich will take relat ively the same
  • OMPI thickness pf chips with each raker will take a chip only of a thickness to which the side cutter elements have scored the kerf.
  • An improved chain provides the chipping of relatively uniform thickness chips from the kerf. Optimal cutting efficiency is attained and, consequently, less power is consumed by using a raker tooth having an offset depth gauge.
  • the first raker tooth will cut a first chip from the kerf of a width approximately equal to one-half the width of the kerf plus one-half the thickness of the body element of the raker tooth. That is, the first chip will always be wider than one-half the width of the kerf which is formed by the chain.
  • the second raker tooth will tend to chip a double-thickness chip from the kerf because the depth gauge of the second raker tooth will run at the bottom of the kerf on the side where the first raker tooth removed its chip.
  • An offset depth gauge overcomes this problem and pro ⁇ vides the more efficient saw chain of this invention. The offset bends the depth gauge out of the plane of the body of the raker tooth so that it will run on the unchipped portion of the kerf. In operation, then, a side cutter element will run along a generally flat kerf to score both sides of the kerf to a predetermined depth.
  • a first raker tooth will run along the kerf at the same depth as the side cutter element to remove a first chip slightly greater in width than one- half the ultimate kerf width.
  • a second side cutter element will rescore the kerf.
  • a second raker tooth with an offset depth gauge, will run at the same depth as the side cutter elements and first raker " tooth to remove the remaining chip in the kerf.
  • the offset depth gauge for raker teeth of this invention improves chain saw efficiency by removing rela ⁇ tively constant thickness chips from the kerf.
  • the work of the saw blade is balanced so less power is required and less heat is generated.
  • the saw chain has less tendency to dig
  • Fig. 1 is a side elevation of a preferred series of teeth in a saw chain made according to this invention.
  • Fig. 2 is a top plan view of an offset depth gauge on a raker tooth of this invention.
  • Fig. 3 is a detailed side elevation of the raker tooth of Fig. 2.
  • Fig. 4 is a front elevation of the raker tooth of Fig. 2.
  • Fig. 5 is a side elevation of another preferred series of teeth in a saw chain made according to this invention.
  • a repeating series of links is shown in one preferred order and arrangement for forming an endless loop of chain.
  • the particular chain described by way of example in the present specification will be under ⁇ stood to be a 3/8-inch pitch chain, with all sizes and dimensions referred to being related thereto.
  • the repeating series includes side links 11 attached with rivets 12 to center links in end-to-end pivotal relationship in a well- known manner.
  • the bottom surfaces of the side link ' s 11 pro ⁇ vide a surface for supporting the chain on the rails of a saw bar.
  • the side links 11 are merely positioned on oppo- site sides of the chain and are identical and interchange ⁇ able.
  • the center links perform three different func ⁇ tions. Some are spacer links 13, including sprocket-
  • OMPI engaging root portions 14 which engage the drive, sprocket of the engine or power input of the chain saw for driving the chain in the direction indicated by the arrow 15.
  • the root portion 14 of all center links is identical, as shown in Figure 1.
  • Some center links are side cutter elements 16. These side cutter elements 16 are fully described in United States Patent 3,745,870, which is incorporated by reference into this specification for this purpose and for the remain- der of its description.
  • center links are raker teeth 17, having either a right- or left-hand conformation.
  • the side cutter elements 16 and raker teeth 17 include depth gauges 18 spaced a predetermined distance ahead of the cutting elements of the center links.
  • a preferred raker tooth 17 of this invention includes an offset depth gauge 18 and a raker cutting element 19R.
  • Line 20 defines the centerline for the chain and the centerline of the kerf.
  • the line 20 also is used to define a plane dividing the kerf into two half-spaces.
  • the depth gauge 18 and raker cutting element 19R are bent out of the plane of the centerline 20 into one of the half-spaces defined by the centerline.
  • the raker element 19R is designed to remove chips of wood from the kerf at a depth set by the depth gauge 18.
  • the depth gauge 18 preferably is offset from the plane defined by the centerline 20 of the chain by a distance at least equal to the width of the body portion 20 of the raker tooth 17. This offset is best shown in the front elevational view of Figure 4. Offset is necessary because the rake ' cutting element 19R will tend to remove a chip equal in width to or slightly greater than one-half the desired width of the kerf plus one-half the width of the body portion 21 of the tooth 17.
  • the second raker tooth in any repeating series will run along the bottom of the kerf in the cut made by the first raker tooth.
  • the raker cutting element will tend to chip out a double-thickness chip of wood rather than the desired chip of equal thickness. This tendency to chip thicker chips from the kerf causes the saw to operate inefficiently.
  • the depth gauge of the side cutter element 16 is set at 0.035 inch, the score of the initial side cutter element will be 0.035 inch on both the left and right edges of the kerf.
  • the first raker tooth 17 (a right-hand raker tooth as shown in Figure 1) will have its depth gauge run along the same level as the depth of the side cutter element 16. Therefore, the raker element 19R (designating a right- hand raker tooth) will remove a chip of approximately 0.035- inch thickness from the kerf.
  • the second raker tooth (a left-hand raker tooth with a aker element designated 19L in Figure 1 ) will also run at the same depth as the side cutter element 16 and first raker tooth because of its offset depth gauge 18. That is, the depth gauge 18 will run upon th.at portion of the kerf which was not chipped away by the first raker tooth 17. Again, the depth gauge 18 of the second raker tooth will regulate the cutting of the left-hand raker element to remove a chip approximately 0.035 inch in thick- ness. Thus the kerf will have a generally smooth bottom after passage of the side cutter element and two raker teeth.
  • the side cutter element will score the edges of the kerf to the depth of 0.035 inch.
  • the first raker tooth will remove a chip of thickness 0.035 inch from slightly more than one-half of the kerf.
  • the second raker tooth will often run upon the low point of the kerf where the first raker tooth has removed a chip already, and, therefore, the second raker tooth will remove a chip 0.070 inch in thick ⁇ ness. Because the side cutter element has only scored the sides of the kerf to 0.035-inch thickness, removal of the extra-thick chip will require additional power. Also, for
  • the depth gauges 18 in the chain need be offset depth gauges. In fact, only one of the depth gauges need be offset if the series of. Fig. 1 is used.
  • the offset depth gauge need only be on the center links of the second raker tooth 17, which follows the first raker tooth. If more than three cutting elements are used in a repeating series, of course, all raker tooth depth gauges following the first raker tooth should be offset.
  • the chain has the following sequence: a side cutter element, a right-hand raker, a second side cutter element (having an offset depth gauge, if desired), and a left-hand raker hav ⁇ ing an offset depth gauge.
  • Offset depth gauges are unneces ⁇ sary for the elements before the first raker tooth because, prior to passage of the first raker tooth, the kerf is rela ⁇ tively smooth. Because the kerf is relatively smooth, how- ever, it does no harm to have offset depth gauges for all of the elements.
  • the offset should be such that the depth gauge will contact that por ⁇ tion of the kerf which has not been removed in earlier cut ⁇ ting in that series of teeth. Ordinarily, bending the depth gauge into the half-space in which the raker element of that depth gauge is disposed at least a distance of one-half the width of the body of the element will provide the desired offset.
  • Offset depth gauges on the side cutter elements generally are not used, because their use would result in a large increase in the production cost of the saw chain. Offsetting these elements would result in four teeth por ⁇ tions to make the side cutter elements and would complicate the assembly accordingly. Therefore, ordinarily, " only the raker teeth use offset depth gauges.

Landscapes

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

Abstract

Afin de permettre l'extraction de copeaux d'épaisseur relativement uniforme tant par le racloir de droite (19R) que par le racloir de gauche (19L) d'une tronçonneuse, la dent (17) du racloir de la présente invention est pourvue d'une jauge de profondeur décalée (18) de sorte que l'élément racloir (19L) se déplace dans la voie de scie à une profondeur sensiblement constante correspondant à la profondeur d'un élément d'entaillage latéral (16) et d'une première dent de racloir (19R). Des dents de racloir individuelles (17) de la présente invention et des tronçonneuses incorporant les nouvelles dents de racloir (17) sont également décrites.
EP19820903278 1981-10-26 1982-09-27 Tronconneuse amelioree Withdrawn EP0092564A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US31474681A 1981-10-26 1981-10-26
US314746 1981-10-26

Publications (1)

Publication Number Publication Date
EP0092564A1 true EP0092564A1 (fr) 1983-11-02

Family

ID=23221254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820903278 Withdrawn EP0092564A1 (fr) 1981-10-26 1982-09-27 Tronconneuse amelioree

Country Status (3)

Country Link
EP (1) EP0092564A1 (fr)
CA (1) CA1190122A (fr)
WO (1) WO1983001409A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE514607C2 (sv) * 1998-02-11 2001-03-19 Rolf Gustafsson Skärlänk till sågkedja

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744548A (en) * 1952-08-15 1956-05-08 Borg Warner Saw chain and tooth therefor
US3155129A (en) * 1962-05-21 1964-11-03 Tillsen H Edmunson Chain sawe tooth
US3200861A (en) * 1963-04-02 1965-08-17 Borg Warner Chain saw chain
US3269431A (en) * 1963-04-03 1966-08-30 Mcculloch Corp Chain saw sharpening mechanism
US3444907A (en) * 1967-03-10 1969-05-20 Earl L Chadwick Saw chain
US3745870A (en) * 1971-07-26 1973-07-17 D Lemery Saw chain

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8301409A1 *

Also Published As

Publication number Publication date
WO1983001409A1 (fr) 1983-04-28
CA1190122A (fr) 1985-07-09

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB LI SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19831230

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LEMERY, DOUGLAS J.