EP0166018A2 - Gelenkige Säge - Google Patents

Gelenkige Säge Download PDF

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Publication number
EP0166018A2
EP0166018A2 EP84107415A EP84107415A EP0166018A2 EP 0166018 A2 EP0166018 A2 EP 0166018A2 EP 84107415 A EP84107415 A EP 84107415A EP 84107415 A EP84107415 A EP 84107415A EP 0166018 A2 EP0166018 A2 EP 0166018A2
Authority
EP
European Patent Office
Prior art keywords
saw blade
cutting
members
saw
link member
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Withdrawn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
EP84107415A
Other languages
English (en)
French (fr)
Other versions
EP0166018A3 (de
Inventor
Carl J. Alexander
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
Priority to US06/059,985 priority Critical patent/US4309931A/en
Application filed by Individual filed Critical Individual
Priority to EP84107415A priority patent/EP0166018A3/de
Publication of EP0166018A2 publication Critical patent/EP0166018A2/de
Publication of EP0166018A3 publication Critical patent/EP0166018A3/de
Withdrawn legal-status Critical Current

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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
    • B27B17/02—Chain saws equipped with guide bar
    • 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
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B27B17/086—Angle drives
    • 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
    • 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
    • B27B33/142—Cutter elements
    • B27B33/145—Cutter elements having plural teeth on a single link
    • 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
    • B27B33/147—Saw chains with incorporated lubricating means

Definitions

  • the present invention is related to saws, and more particularly, to power driven saws which utilize an endless array of cutting teeth.
  • Saws such as a hand saw or those employing reciprocating saw blade mechanisms, have the disadvantage of inefficiency associated with the return stroke.
  • the band saw has the advantage over the reciprocating saw in that return stroke efficiency is eliminated as the band saw operates to continuously cut. Further, the band saw has a much narrower kerf as compared to the chain saw.
  • the use of a band saw also has disadvantages.
  • the band saw has a throat limitation which limits the size of the material being cut. And, of course, the throat limitation of a band saw limits the effectiveness of the band saw if it were to be used in some portable embodiment.
  • a band saw blade is constantly undergoing bending and flexing as it is engaged by the drive and idler wheels. Since the band saw blade must be able to withstand the flexing and bending, the blade is limited to certain suitable flexible materials and to appropriate hardness tempers.
  • the saw of the present invention substantially mitigates or eliminates the disadvantages associated with the other types of currently employed saw devices yet incorporates many of the desirable features of the chain saw and the band saw.
  • This invention contemplates a power-driven articulated saw blade mounted on a frame and a blade support structure therefor to provide a saw having the general shape and portability of a conventional portable chain saw but having a substantially narrower kerf.
  • the articulated blade is substantially planar and comprises interconnected, relatively thin, planar cutting members in an endless array. Each cutting member has a pair of opposed longitudinal margins and a pair of end margins. A plurality of cutting teeth is provided along one of the longitudinal margins to define a cutting face.
  • each cutting member is substantially planar. That is, the top edges of all cutting teeth along the longitudinal margin of a cutting member and having the same shape lie substantially in a common plane.
  • the edges of the cutting teeth on a cutting member may define, if desired, a curve or other non-planar profile along the longitudinal margin of the cutting member.
  • the cutting members also are disposed substantially end to end to form an articulated band and to present a circumferential row of cutting teeth about the periphery of the band.
  • the array of cutting members is adapted to define at least a cutting region or segment of the band wherein the cutting faces of a plurality of cutting members define and lie along a cutting surface.
  • the saw blade of the present invention is adapted to be mounted on a saw blade support structure, preferably one that defines a convexly curved or crowned support for the saw blade in the cutting region or segment of the saw so that the profile of the cutting region of the saw blade, and hence the cutting surface, is slightly convex.
  • a saw blade support structure preferably one that defines a convexly curved or crowned support for the saw blade in the cutting region or segment of the saw so that the profile of the cutting region of the saw blade, and hence the cutting surface, is slightly convex.
  • the saw blade per se when it is not mounted on the saw, can be arranged so that the cutting faces of a plurality of adjacent cutting members lie in the same general flat plane. This permits the saw blade to also be used on a saw having a flat or straight cutting region.
  • the present saw blade has a novel structure that permits rotation of any two adjacent cutting members in respective opposing first directions out of a generally straight line alignment but prevents rotation of the adjacent cutting members out of the straight line alignment in opposing respective second directions that are also opposite to the first directions.
  • the blade structure permits rotation of any two adjacent cutting members in opposite directions out of the plane defined by the cutting faces so that the planar cutting faces face away from each other. Rotation in the opposite directions beyond this plane is prevented.
  • any two adjacent cutting members with planar cutting faces in opposite directions out of the convex cutting surface is possible in either direction for each cutting member -- but only so long as the included angle formed between the plane of the cutting faces of two adjacent cutting members is not less than about ⁇ radians (i.e., substantially a straight angle). In other words, rotation of adjacent cutting members beyond the 180° or straight angle orientation wherein the cutting faces of adjacent cutting members would begin to face each other is prevented.
  • saw frame 12 (hidden in FIGURE 1 and shown in dashed line) is provided to mount saw blade support 14 and saw blade drive means 16. Connected to frame 12 are handles 18. Saw 10 is portable and can be held by handles 18 for cutting at any angle.
  • a first embodiment of an articulated saw blade 20' of this invention is disposed about the periphery of saw blade support 14 and engaged at one end of saw 10 by saw blade drive means 16 which, in turn, is driven via shaft 17 by a suitable prime mover such as an electric motor, an internal combustion engine, or the like (not visible in FIGURE 1).
  • a suitable prime mover such as an electric motor, an internal combustion engine, or the like (not visible in FIGURE 1).
  • FIGURE 3 The first embodiment of a saw blade 20' of this invention is shown in greater detail in FIGURE 3.
  • One row of planar cutting members 74 is utilized in this embodiment and the consecutive cutting members 74 are disposed substantially end to end in an interconnected endless array to form a substantially planar, articulated band.
  • Cutting members 74 are substantially flat and are generally rectangular in shape having opposed longitudinal margins and opposed end margins. Provided on one of the longitudinal margins of each cutting member 74 is a plurality of cutting teeth 76 which are generally in the plane of the cutting member and which define a cutting face.
  • each cutting member 74 is joined together by pivotal connection means integral therewith.
  • One end margin of each cutting member 74 is provided with an inwardly extending arcuate notch 78, the major portion of which is defined by a circular arc which receives a complementary, planar extending projection 80 from an adjacent cutting member 74.
  • Extending projection 80 is of a configuration adapted to fit within arcuate notch 78 and thus form a pivotable interconnection therewith.
  • extending projection 80 is generally circular in shape to substantially match the circular arc of the notch.
  • This connecting means or structure permits rotation of the adjacent connected cutting members 74 in opposing first directions wherein the cutting faces face away, or are angled away, from each other as the blade travels around the shorter radius of curvature of the saw ends.
  • extending projection 80 In order that extending projection 80 not be pulled out of engagement with the circular notch 78, it is necessary that the circular arc of material forming the circular notch 78 extends greater than radians or 180°.
  • bevels 84 are provided on each end of cutting members 74 and the extent of the tircular notch is preferably less than about 3/2 ⁇ radians or about 270°.
  • FIGURE 2 best illustrates how the first embodiment of the saw blade 20' is mounted on the saw 10.
  • the saw blade support 14 comprises two elongated blade support side retaining members 38 and one elongated blade support center member 40 disposed between the two side retaining members 38.
  • Side retaining members 38 are joined to the center member 40 with spot welds 41.
  • Spot welds 41 can be disposed generally uniformly about the periphery of the saw blade support 14 as best shown in FIGURE 1.
  • the longitudinal side edges of the saw blade support 14 are provided with a slight crown.
  • the saw blade support 14 can be machined from a single piece, as by diamond wheel milling of a slot in the end face of a suitably shaped plate.
  • the articulated saw blade 20' is mounted on the saw blade support 14 with the lower portion of each of the cutting members 74 disposed within the slot formed between the extending peripheral portions of the two side retaining members 38.
  • the bottom surface of each cutting member 74 is supported upon the support face provided by the periphery of the blade support center member 40. This structure retains the articulated saw blade 20' within the saw blade support 14 and provides continuous support for each cutting member 74 as the saw blade 20' cuts.
  • the portion of the blade 20' between the curved ends of the saw 10 defines a cutting region or segment wherein the cutting faces of a plurality of the cutting members 74 define and lie along a cutting surface.
  • a workpiece is preferably cut along this cutting surface between the curved ends of the saw 10.
  • FIGURE 3A A modification of the saw blade 20' is shown in FIGURE 3A and designated by reference numeral 20 " therein.
  • the saw blade 20'' includes cutting members 74A generally similar to the cutting members 74 of blade 20' shown in FIGURE 3 except that one end of each cutting member 74A extends forwardly of the arcuate notch 78A to define an engaging surface 79A. A portion of the other end of each cutting member 74A defines an upwardly facing abutment surface 81A adjacent the circular projection 80A.
  • the abutment surface 81A and engaging surface 79A function to prevent substantial rotation of adjacent connected cutting members in opposite directions out of the cutting surface through an angle formed between the planes of the cutting faces of two adjacent cutting members not less than about radians. In other words, the cutting members are prevented from rotating beyond the 180° or straight angle orientation wherein the cutting faces of adjacent cutting members 74A would begin to face each other.
  • blade 20'' will be substantially rigid and strong when it is cutting a work piece in the cutting region and blade 20'' will resist inward flexing or bending.
  • FIGURES 4 and 5 show a second embodiment of the saw blade of the present invention.
  • Identical, individual planar cutting members 86 and 88, with teeth 93, are spaced in end-to-end relation and hingedly connected to one another by steel cable 90 or the like which is disposed within a channel 89 in each cutting member and crimped to each cutting member with a plurality of crimps 92.
  • the cable 90 and crimp connection 92 is shown in cross section in FIGURE 5.
  • a plurality of cutting members 86 and 88 are thus secured to a loop of cable 90 to form an endless array of cutting members defining an articulated band or saw blade.
  • Cutting members 88 and 86 are identical in shape. Each member has an end slot and an end projection which receive and engage, respectively, the end projection and end slot of adjacent members whereby the articulated band of connected cutting members is interlocked to resist lateral forces.
  • cutting member 88 is illustrated as having end slot 94 receiving end projection 96 of cutting member 86.
  • end projection 98 On the opposite end of member 88 is end projection 98 and on the opposite end of member 86 is end slot 100.
  • Each cutting member includes shoulder 102 on each side of central keel portion 104 for supporting the cutting member on the periphery of a blade support member, such as on the retaining plates 38 of blade support member 14 (illustrated in FIGURE 2).
  • Keel portion 104 is adapted to be slidably disposed within the central slot of such a blade support 14. If desired, the cutting members can be designed so that the shoulders 102 are elevated above the periphery of the support member and so that only the bottom of the keel portion 104 supports each cutting member on the blade support center member 40 (FIGURE 2).
  • bevels 106 can be provided at the ends of cutting members below the fulcrum point on cable 90 and/or sufficient space can be maintained between the cutting members along cable 90.
  • the novel end slot and end projection structure of the cutting members functions to limit rotation of adjacent cutting members in second directions (opposite to the first directions) beyond a generally straight line (7 radians) along identical points on each cutting member. That is, the adjacent cutting members 86 and 88 cannot rotate away from the saw blade support 14 beyond the orientation wherein the cutting faces of teeth 93 lie in a substantially common plane. This provides a strong and rigid cutting blade even if the cutting member shoulders 102 are spaced above the saw blade support side retaining members 38 and only the keel portion 104 is supported on the center member 40 of the saw blade support 14.
  • a second embodiment of the saw of the present invention is generally designated by reference numeral 210 in FIGURES 6 and 7.
  • Saw 210 includes saw frame 212 on which is mounted saw blade support 214, saw blade drive means 216, and motor 213. Saw 210 is portable and can be held by handles 218 for cutting at any angle.
  • a third embodiment of an articulated saw blade is disposed about the periphery of saw blade support 214 and engaged at one end of saw 210 by saw blade drive means 216 which, in turn, is driven via shaft 217 by motor 213 operating through a suitable gear drive system.
  • the motor 213 may be an electric motor, an internal combustion engine, or other suitable prime mover.
  • Blade 420 is best illustrated at FIGURES 8 and 9.
  • Blade 420 comprises an endless array of substantially planar cutting members 424 which are disposed substantially end to'end to form a substantially planar, articulated band.
  • Each substantially planar cutting member 424 in the endless array has a pair of opposed end margins 426.
  • Each cutting member 424 also has a pair of opposed longitudinal margins, one of the longitudinal margins defining the bottom of cutting member 424 and the other of the longitudinal margins defining the top of cutting member 424 which includes a plurality of cutting teeth 430 that define a cutting face thereon.
  • Cutting teeth 430 of each cutting member 424 together form a substantially continuous circumferential row of cutting teeth about the periphery of articulated blade 420.
  • each cutting member 424 includes a pair of spaced-apart sidewalls 434 which are open along the lower portions of the cutting member end margins 426 and along the bottom of the cutting member opposite the cutting teeth 430. Sidewalls 434 are connected together inwardly (upwardly) of the bottom of the cutting member at crosswall 436.
  • Blade 420 includes means for connecting the cutting members in the endless array so that some number of cutting members can be oriented in a generally straight line along identical points on each cutting member as illustrated in FIGURE 8.
  • the connecting means includes planar link members 440 which are disposed in spaced end-to-end relationship.
  • Each link member 440 has a pair of end margins 442 and a pair of opposed longitudinal margins that include top longitudinal margin 444 and bottom longitudinal margin 446.
  • An end margin 442 of one link member 440 is adapted to be received between the spaced-apart sidewalls 434 at one end of one of the cutting members 424.
  • the other end margin 442 of link member 440 is adapted to be received between the sidewalls 434 of another cutting member 424.
  • journal bearing 450 presents a substantially right cylindrical bearing surface through each end of each link member 440.
  • a journal 460 is disposed within each journal bearing 450.
  • Each journal 460 is a small disc-shaped shaft and connects the spaced-apart sidewalls 434 of a cutting member 424 on either side of link member 440.
  • Journal 460 is free to rotate within journal bearing 450, but is secured by appropriate means, such as by electron beam welding or the like, to sidewalls 436 of cutting member 424.
  • the cutting teeth 430 extend across the upper longitudinal margin or top of each cutting member 424 so that the top edges of teeth 430 can lie in a substantially common plane. Further, all cutting members 424 are connected within articulated band 420 so that all cutting teeth 430 are in substantially vertical alignment along any portion of the band when link members 440 in that portion are arranged with their bottom margins 446 in a common plane.
  • each link member 440 The bottom surface of bottom longitudinal margin 446 of each link member 440 is a bearing surface. This bearing surface supports each link member 440, and hence articulated band 420, in a suitable saw blade support, such as saw blade support 214 of saw 210 illustrated in-FIGURE 6.
  • Saw blade support 214 may have a construction generally identical to saw blade support 14 of the first embodiment of saw 10 described above with reference to FIGURES I and 2.
  • saw blade support 214 includes a pair of side retaining members 238 generally similar to the side retaining members 38 of the first embodiment of the saw 10 described above with reference to FIGURES 1 and 2.
  • Saw blade support 214 also includes a blade support center member 240 which is generally similar to center member 40 illustrated in FIGURES 1 and 2 for the first embodiment of saw 10 described above.
  • side retaining members 238 preferably extend outwardly beyond the center member 240 a distance D in the cutting region between saw blade drive means 216 and the arcuate distal end of the saw 210.
  • the side retaining members 238 extend outwardly a distance d at the arcuate distal end of the saw 210.
  • the distance D is preferably greater than the distance d.
  • the novel articulated saw blade 420 of the present invention is retained within saw blade support 214 and saw blade support 214 provides a continuous support for the saw blade link members 440 as will next be explained.
  • each link member 440 extends below the bottom longitudinal margin of each cutting member 424 and is adapted to be received between the two elongated side retaining members 238 of saw blade support 214.
  • the bottom surface of lower longitudinal margin 446 of each link member 440 preferably bears upon, and is supported by, the upwardly facing surface of blade support center member 240.
  • the bottom surfaces of the lower margins of each cutting member 424 i.e., the bottom ends of sidewalls 434
  • the bottom margins of each cutting member 424 are spaced outwardly away from the saw blade support side retaining members 238.
  • each cutting member 424 is provided with notch means or a notch defined in each sidewall 434 by arcuate wall 460 and by two generally converging walls 462 that merge with arcuate wall 460.
  • This notch acts as a drive engagement means for being engaged by saw blade drive means 216 as will next be described.
  • saw blade drive means 216 disposed at one end of saw blade support 214, comprises a sprocket or drive wheel 250 mounted on shaft 217.
  • Sprocket 250 has a plurality of circumferentially spaced pairs of spaced-apart parallel spokes 252 which project radially outwardly in relation to shaft 217.
  • a shaft 254 is mounted between each pair of spaced-apart parallel spokes 252.
  • a roller 256 is mounted on each shaft 254 for intermittently entering the notches of cutting members 424 and for engaging cutting members 424 to move saw blade 420 around the periphery of saw blade support 214.
  • Sprocket 250 may be driven by a suitable gear system, such as a skew-axis gear system of conventional design well known to those skilled in the art of drive gear system design.
  • a suitable gear system such as a skew-axis gear system of conventional design well known to those skilled in the art of drive gear system design.
  • the relative positions of the drive notches of cutting members 424 and the ends of each link member 440 be oriented so that all of the journals 460 are properly aligned and so that the drive notches are uniformly spaced along saw blade 420.
  • each link member 440 may be slanted so as to accommodate contact with drive rollers 256 on sprocket 250.
  • articulated saw blade 420 is driven at each roller 256 in such a manner that each roller 256 simultaneously engages a cutting member 424 and a link member 440 in the driving direction. This arrangement further distributes the driving force over a larger bearing area.
  • each link member 440 can be provided with one or more holes or apertures 470 adjacent the bottom margin of link member 440 to function as a trap for lubricant so that lubricant can be carried along saw blade support 214.
  • top margin 444 of each link member 440 functions as an abutment surface.
  • the downwardly facing surface of crosswall 436 of each cutting member 424 functions as an engaging surface between sidewalls 434 for engaging the upwardly facing abutment surface of upper margin 444 of a connected link member 440.
  • This engaging surface of cutting member 424 engages the abutment surface of upper margin 444 of a link member 440 when a plurality of cutting members 424 are oriented to form a generally straight line along identical points on each cutting member as illustrated for the members on the righthand side of FIGURE 8.
  • This type of structure permits rotation of any two adjacent cutting members 424 in opposing first directions but prevents rotation of adjacent cutting members 424 out of the straight line orientation in opposing second directions that are opposite to the first directions.
  • the structure prevents rotation of two adjacent connected cutting members in opposite directions (out of the cutting surface defined by teeth 430) through an angle formed between planes of the cutting faces of the two cutting members of not less than about radians.
  • a fourth embodiment of an articulated saw blade designated generally by reference numeral 520 in FIGURES 10 and 11, is also adapted to be disposed in saw 210 of FIGURES 6 and 7 in a manner substantially similar to saw blade 420 described above with reference to FIGURES 6-9.
  • This particular articulated blade design is well suited for cutting relatively hard materials such as metals.
  • Saw blade 520 comprises an endless array of substantially planar cutting members 524 which are disposed substantially end to end to form a substantially planar, articulated band.
  • Each substantially planar cutting member 524 in the endless array has a pair of opposed end margins 526.
  • Each cutting member 524 also has a pair of opposed longitudinal margins, one of the longitudinal margins defining the bottom of cutting member 524 and the other of the longitudinal margins defining the top of cutting member 524 which includes a plurality of cutting teeth 530 that define a cutting face thereon.
  • Cutting teeth 530 of each cutting member 524 can extend from one end of the cutting face to the other and together with the cutting teeth of other cutting members form a substantially continuous circumferential row of cutting teeth about the periphery of articulated blade 520.
  • each cutting member 524 includes a pair of spaced-apart sidewalls 534 which are open at the bottom of the cutting member and along the lower portions of the cutting member end margins 526. Sidewalls 534 are connected together inwardly (upwardly relative to FIGURE 11) of the bottom of the cutting member at crosswall 536. At each end margin 526 of each cutting member 524, crosswall 536 extends outwardly beyond sidewalls 534 for purposes to be described in detail hereinafter.
  • Blade 520 includes means for connecting the cutting members in the endless array so that some number of cutting members can be oriented in a generally straight line along identical points on each cutting member as illustrated for the cutting members 524 on the righthand side of FIGURE 10.
  • the connecting means includes planar link members 540 which are disposed in spaced end-to-end relationship.
  • Each link member 540 has a pair of end margins 542 (which are preferably slanted as illustrated) and a pair of opposed longitudinal margins that include top longitudinal margin 544 (FIGURE 11) and bottom longitudinal margin 546.
  • an end margin 542 of one link member 540 is adapted to be received between the spaced-apart sidewalls 534 at one end of one of the cutting members 524.
  • the other end margin 542 of link member 540 is adapted to be received between the sidewalls 534 of another cutting member 524.
  • Means are provided for connecting each cutting member 524 to a link member 540 in a manner similar to the manner for connecting link members 440 and cutting members 424 described above with reference to FIGURES 8 and 9.
  • Journal bearing 550 presents a substantially right cylindrical bearing surface through each end of each link member 540.
  • a journal 560 is disposed within each journal bearing 550.
  • Each journal 560 is a small disc-shaped shaft and connects the spaced-apart sidewalls 534 of a cutting member 524 on either side of link member 540.
  • Journal 560 is free to rotate within journal bearing 550, but is secured by appropriate means, such as by electron beam welding or the like, to sidewalls 536 of cutting member 525.
  • the cutting teeth 530 extend across the upper longitudinal margin or top of each cutting member 524 so that the top edges of teeth 530 can lie in a substantially common plane. Further, all cutting members 524 are connected within articulated band 520 so that all cutting teeth 530 are in substantially vertical alignment along any portion of the band when link members 540 in that portion are arranged with their bottom margins 546 in a common horizontal plane.
  • each link member 540 The bottom surface of bottom longitudinal margin 546 of each link member 540 is a bearing surface. This bearing surface supports each link member 540, and hence articulated band 520, in a suitable saw blade support, such as saw blade support 214 of saw 210 illustrated in FIGURE 6. Saw blade 520 is supported in saw 210 in a manner substantially identical to that described above for saw blade 420 with reference to FIGURES 6-9.
  • saw blade 520 is driven in the same manner as saw blade 420.
  • the lower longitudinal margin of each cutting member 524, opposite cutting teeth 530 is provided with notch means or a notch defined in each sidewall 534 by arcuate wall 560 and by two generally converging walls 562 that merge with arcuate wall 560.
  • This notch acts as a drive engagement means for being engaged by saw blade drive means 216 in the same manner as described above for saw blade 420 with reference to FIGURES 6-9.
  • each link member 540 can be provided with one or more holes or apertures 570 adjacent the bottom margin of link member 540 to function as a trap for lubricant so that lubricant can be carried along saw blade support 214.
  • each link member 540 defines an upwardly projecting abutment surface 545 disposed between two spaced-apart notches 547 as best illustrated in FIGURE 11.
  • This link member structure in cooperation with the connected cutting members, provides a strong blade that resists bending inwardly towards the saw support structure when saw blade 520 is cutting a workpiece.
  • the inner surface of crosswall 536 at each end of a cutting member 524 functions as an engaging surface for engaging the facing abutment surface 545 of upper margin 544 of a connected link member 540.
  • the engaging surface of cutting member crosswall 536 engages the link member abutment surface 545 when a plurality of cutting members 524 are oriented to form a generally straight line along identical points on each cutting member as illustrated in FIGURE 10 for the members 524 on the righthand side of the Figure.
  • This type of structure permits rotation of any two adjacent cutting members 524 in opposing first directions but prevents rotation of adjacent cutting members 524 out of the straight line orientation in opposing second directions that are opposite to the first directions.
  • the structure prevents rotation of two adjacent connected cutting members in opposite directions (out of the cutting surface defined by teeth 530) through an angle formed between the planar cutting faces of less than about ⁇ radians.
  • those cutting members being driven through the cutting region of saw blade support 214 resist inward deflection and provide a strong blade during cutting even though the cutting members may be spaced away from the edges of side retaining plates 238.
  • Blade 520 is especially effective for cutting metal. It has been found that the metal chips and particles produced during cutting sometimes may accumulate in a slot such as the slot defined between the sidewalls 434 of cutting member 424 in FIGURES 8 and 9. Such chips are less likely to accumulate on the relatively small abutment surface 545 of link member 540 of blade 520 in FIGURES 10 and 11. The chips fall from surface 545 and away from the saw although some of the chips may be initially received into notches 547 on either side of surface 545.
  • cutting members 524 and link members 540 are oriented in a generally straight line as shown on the righthand side of FIGURE 10, the coaction of a cutting member 524 and a connected link member 540 cause notch 547 to be enclosed and together define an aperture 548. Thus, some of the chips that are carried in notches 547 or apertures 548 fall out as the articulated blade moves about the blade support.
  • This type of structure thus minimizes chip build up between the engaging surface of a cutting member crosswall 536 and the confronting link member abutment surface 545.
  • a cutting member and connected link member have rotated relative to one another when passing around an end of the saw, no significant amount of chips will remain on the abutment surface 545 to prevent subsequent realignment of the saw blade cutting members and link members in the substantially straight line (or slightly crowned) orientation in the cutting region of the saw between the two ends of the saw.
  • the cutting teeth of the saw blade embodiments described herein can be of any hardness and shape desired.
  • the cutting teeth can be carbide- clad or can be carbide or diamond particles for cutting stone, cement, or other hard material, if desired.
  • other types of teeth such as raker teeth or non-cutting teeth may be provided along the cutting face of each cutting member with the cutting teeth.
  • the saw may be powered by any suitable means such as an air motor, an internal combustion engine, an electric motor, a hydraulic motor, and the like.
  • the saw disclosed herein is thus seen to have many advantages over existing power-driven saws.
  • the present articulated saw blade can be made from relatively thin planar individual cutting members.
  • the cutting members being joined by novel means, add little or no extra lateral thickness to the saw blade.
  • the cutting teeth do not have to be unnecessarily raked outwardly so as to make an enlarged kerf in order to accommodate lateral protuberances on the sides of the cutting blades.
  • the side surfaces of the cutting members do not have laterally extending projections or protuberances and can be made very smooth. This also contributes to a smooth cut.
  • the narrower kerf provided by this invention produces less cutting waste and, therefore, conserves material. Further, the narrower kerf requires less power and, therefore, requires less energy input to drive the saw.
  • the saw blade of this invention is seen to be lighter than the typical chain saw blade and thus has less momentum during operation at a given speed.
  • less torque is required to accelerate the articulated saw blade to the design speed in a given time interval.
  • the destructive effects of such a break would be less severe than with the heavier chain saw type blade.
  • the saw of this invention is more efficient in that it continuously cuts and does not have a wasted return motion.
  • the saw of this invention is portable and does not have a throat limitation such as found in a conventional band saw.
  • the saw has the advantage of unlimited vertical capacity.
  • the cutting members of the saw blade of this invention do not have to be made to bend or flex as does a band saw blade, the cutting members (and, where used, the link members) of this invention are not limited to only those materials that can withstand flexing and bending. This permits the use of many different types of materials, including those of any hardness or temper desired.

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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)
EP84107415A 1978-09-19 1984-06-27 Gelenkige Säge Withdrawn EP0166018A3 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US06/059,985 US4309931A (en) 1978-09-19 1979-07-23 Articulated saw
EP84107415A EP0166018A3 (de) 1984-06-27 1984-06-27 Gelenkige Säge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84107415A EP0166018A3 (de) 1984-06-27 1984-06-27 Gelenkige Säge

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EP0166018A2 true EP0166018A2 (de) 1986-01-02
EP0166018A3 EP0166018A3 (de) 1987-11-19

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1779083A (en) * 1927-01-26 1930-10-21 Chain Saw Corp Link for belts or chain saws
US1979001A (en) * 1934-10-30 Sawing machine
US2320082A (en) * 1940-12-03 1943-05-25 Kupka Edward Chain saw
US3444907A (en) * 1967-03-10 1969-05-20 Earl L Chadwick Saw chain
US4309931A (en) * 1978-09-19 1982-01-12 Alexander Carl J Articulated saw
US4464964A (en) * 1979-07-23 1984-08-14 Alexander Carl J Articulated saw

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979001A (en) * 1934-10-30 Sawing machine
US1779083A (en) * 1927-01-26 1930-10-21 Chain Saw Corp Link for belts or chain saws
US2320082A (en) * 1940-12-03 1943-05-25 Kupka Edward Chain saw
US3444907A (en) * 1967-03-10 1969-05-20 Earl L Chadwick Saw chain
US4309931A (en) * 1978-09-19 1982-01-12 Alexander Carl J Articulated saw
US4464964A (en) * 1979-07-23 1984-08-14 Alexander Carl J Articulated saw

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