US3748942A - Stabilizing center drive link for saw chain - Google Patents

Stabilizing center drive link for saw chain Download PDF

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Publication number
US3748942A
US3748942A US00258651A US3748942DA US3748942A US 3748942 A US3748942 A US 3748942A US 00258651 A US00258651 A US 00258651A US 3748942D A US3748942D A US 3748942DA US 3748942 A US3748942 A US 3748942A
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US
United States
Prior art keywords
link
links
chain
pivotal connection
projected
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.)
Expired - Lifetime
Application number
US00258651A
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English (en)
Inventor
C Ross
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.)
Oregon Tool Inc
Original Assignee
Omark Industries Inc
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Filing date
Publication date
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Application granted granted Critical
Publication of US3748942A publication Critical patent/US3748942A/en
Assigned to BLOUNT, INC. reassignment BLOUNT, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OMARK INDUSTRIES, INC., A CORP. OF OR
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/909—Cutter assemblage or cutter element therefor [e.g., chain saw chain]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/909—Cutter assemblage or cutter element therefor [e.g., chain saw chain]
    • Y10T83/917—Having diverse cutting elements
    • Y10T83/921—And noncutting depth gauge

Definitions

  • ABSTRACT A chain comprised of a conventional sequence of pivotally connected links some of which links have extensions for engaging objects, e.g., links wherein the extensions have sharpened edges for engaging and cutting trees.
  • the novelty being the provision of links preceding and following the links having the extensions provided with forwardly projected portions and rearwardly projected portions. The rearwardly projected portions underlie the forwardly projected portions of the following links to restrict independent pivotal movement via leverage action.
  • This invention relates to stabilizing links in a sequence of chain links to restrict independent pivotal movement of certain links in the sequence.
  • the stabilizing links are applicable for restricting a cutting link of a saw chain from rearing back as is typical during the cutting operation of conventional saw chain. It will be understood, however, that similar restriction of pivotal movement is desireable in comparable chain uses, e.g., conveyor chain.
  • the present invention includes an interconnection between adjacent center links whereby a forwardly projected portion of one center link overlaps a rearwardly projected portion of the preceding center link.
  • This interconnection is designed so that the center links can be pivoted together but because of the overlapping interconnection, the rear end of the front center link cannot be raised without also raising the front end of the following center link.
  • the front and rear pivotal connections of the cutting links are connected to successive center drive links, the front of the cutting link cannot be raised (rearing back) without either raising both center links or causing rearward pivoting of the front center link. Chain tension resists such rearward pivoting of the center link and this reduces the undesireable rearing back of the cutting link.
  • FIG. 1 illustrates a saw chain of the present invention as mounted on the straight reach of a chain saw guide bar
  • FIG. 2 illustrates the saw chain of FIG. 11 passing around a sprocket
  • FIG. 3 is a perspective view illustrating the interconnecting arrangement of adjacent center drive links.
  • FIG. 1 illustrates a section of saw chain including center drive links 10, side links 12 and cutting links 14.
  • Side links have been removed from selected positions in the sequence for purposes of illustration. It will be understood that for every cutting link and side link shown, on the opposite side of the center links, there are corresponding side links.
  • the links are pivotally interconnected by rivets 16.
  • Each of the cutting links 14 include a body portion 18 similar in structure to the side links 12 but including extensions forming a cutter 20 and depth gauge 22.
  • the center links 10 include downwardly projected portions 24 (as viewed in FIG. I). These downwardly projected portions are adapted to ride in a groove 26 formed in a guide bar 28 of a chain saw (only a portion of which is illustrated in FIG. 1).
  • the cutting links 14 and side links 12 are adapted to ride on upper edge 30 provided on each side of the groove of the guide bar.
  • the downwardly projected portions 24 provide the means for a sprocket 32 (shown in FIG. 2) to engage these downwardly projected portions to drive the saw chain around the bar of the chain saw.
  • the present saw chain is differentiated from conventional saw chain in the provision of the forwardly projected portions 34 and rearwardly projected portions 36 of the center drivelinks 10.
  • the forwardly projected portion 34 is generally above a center line 40 (drawn through the rivet holes 38) with a bottom edge forming an upper shoulder 34a.
  • the rearwardly projected portion 36 is generally below the center line 40 with an upper edge forming a lower shoulder 36a adapted to abut the shoulder 34a when the adjacent links are aligned as shown in FIG. 1 and FIG. 3.
  • the rearward and forward extensions can be any of a number of configurations, it is considered to be an advantage for the rearward extension to be shorter than the forward extension to avoid binding as the chain bends around the sprocket.
  • center drive links 10 are each provided with forward and rearward projections 34 and 36, the interconnection is desired primarily at the positions where the interconnection is bridged by a cutting link 14.
  • reference to front and back center links is intended as being relative to the interconnection bridged by a cutting link.
  • the cutting force acting against the cutting edge 41 urges pivoting of the cutting link with a force acting to push down on the rear end of the cutting link and acting to raise the front end.
  • the front rivet is raised, which rivet is also the rear rivet of the front center link.
  • the front of the back center link is held down by reason of its rivet connection with the rear end of the cutting link.
  • the forwardly projected portion 34 holds down or anchors the rearwardly projected portion 36 of the front center link and in order for the front end of the cutting link to be raised, it must raise the front end of the front center link pivotally about the anchor point established by the overlapping engagement. Because of the short distance between the anchor point and the rivet connection, the front end of the forward center link is raised to a much greater degree than the cutting link, creating an imbalance of effective leverage forces so that the normal chain tension acting to hold the front end of the center link in alignment, effectively resists the objectionable rearing back of the cutting link.
  • the center links of the present chain design have interengaging shoulder portions with contacting surfaces defining an anchor point (which point I may move slightly during pivoting) located rearward of the forward rivet connection (rear rivet connection of the front center link and front rivet connection of the cutting link). It. is not considered necessary for the anchor point to be aligned with the rivet connections. However, it is considered necessary for the anchor point to be positioned within the arc defined by the pivoting of said forward rivet connection about the rear end of the cutting link. Note that if the pivotingof the said forward rivet connection creates an effective line of force forward the anchor point established by the contacting overlapping surfaces, the front center link is prevented from pivoting and the chain becomes stiff, creating hazards of kick back and making it difficult to handle. The above also distinguishes the present chain over that of the Dobbertin patent reference previously noted.
  • a chain of interconnected links adapted to be driven on a predetermined guide track whereby the chain is placed in tension comprising: a sequence of chain links, one of said links in said sequence having an outer extension for engaging an object whereby rearward pivoting thereof is urged, said engaging link having a front pivotal connection with a preceding link and a rear pivotal connection with a following link, both of said preceding and following links being on the same side of the engaging link, said preceding link having a portion projected rearwardly of said front pivotal connection and said following link having a portion projected forwardly of said rear pivotal connection, said forwardly projected portion of said following link overlapping said rearwardly projected portion of said preceding link, said rearwardly and forwardly overlapping projected portions being in contact upon upward movement of the preceding link relative to the following link, said contacting overlapping portions providing an anchor point rearward of the arc generated by pivoting of said front pivotal connection as induced by pivoting of said engaging link, said anchor point being a pivot about which the preceding link pivots outwardly as urged
  • a saw chain adapted to be drivingly entrained on the saw chain guide bar of a chain saw comprising: a sequence of saw chain links, one of said links in said sequence having an outer extension with a sharpened forward edge providing a cutting link in said sequence, said cutting link having a frontpivotal connection with a preceding link and a rear pivotal connection with a following link, both of said preceding and following links being on the same side of the cutting link, said preceding link having a portion projected rearwardly of said front pivotal connection and said following link having a portion projected forwardly of said rear pivotal connection, said forwardly projected portion of said following link overlapping said rearwardly projected portion of said preceding link, said rearwardly and forwardly overlapping projected portions being in contact upon upward movement of the preceding link relative to the following link, said contacting overlapping portions providing an anchor point rearward of the are generated by pivoting of said front pivotal connection as induced by pivoting of said engaging link, said anchor point being a pivot about which the preceding link pivots upon continuing upward movement of the

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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)
US00258651A 1972-06-01 1972-06-01 Stabilizing center drive link for saw chain Expired - Lifetime US3748942A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25865172A 1972-06-01 1972-06-01

Publications (1)

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US3748942A true US3748942A (en) 1973-07-31

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Application Number Title Priority Date Filing Date
US00258651A Expired - Lifetime US3748942A (en) 1972-06-01 1972-06-01 Stabilizing center drive link for saw chain

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US (1) US3748942A (US06650917-20031118-M00005.png)
JP (1) JPS4956296A (US06650917-20031118-M00005.png)
CA (1) CA979333A (US06650917-20031118-M00005.png)
DE (1) DE2325067B2 (US06650917-20031118-M00005.png)
SE (1) SE419424B (US06650917-20031118-M00005.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172619A (en) * 1988-10-28 1992-12-22 Kolve Gerald C Single side cutter tooth with facing raker tooth

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640846A1 (de) * 1986-11-29 1988-06-09 Stihl Maschf Andreas Motorsaege
DE4212992A1 (de) * 1992-04-18 1993-10-21 Black & Decker Inc Sägekette

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176733A (en) * 1963-05-13 1965-04-06 Partner Ab Saw chains
US3542096A (en) * 1968-07-10 1970-11-24 John W Oehrli Saw chain
US3608595A (en) * 1968-07-10 1971-09-28 John W Oehrli Saw chain

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176733A (en) * 1963-05-13 1965-04-06 Partner Ab Saw chains
US3542096A (en) * 1968-07-10 1970-11-24 John W Oehrli Saw chain
US3608595A (en) * 1968-07-10 1971-09-28 John W Oehrli Saw chain

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172619A (en) * 1988-10-28 1992-12-22 Kolve Gerald C Single side cutter tooth with facing raker tooth

Also Published As

Publication number Publication date
CA979333A (en) 1975-12-09
DE2325067B2 (de) 1981-06-04
JPS4956296A (US06650917-20031118-M00005.png) 1974-05-31
SE419424B (sv) 1981-08-03
DE2325067A1 (de) 1973-12-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BLOUNT, INC.,ALABAMA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OMARK INDUSTRIES, INC., A CORP. OF OR;REEL/FRAME:004760/0333

Effective date: 19870623

Owner name: BLOUNT, INC., 4520 EXECUTIVE PARK DR., P.O. BOX 94

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:OMARK INDUSTRIES, INC., A CORP. OF OR;REEL/FRAME:004760/0333

Effective date: 19870623