ARBOR SAW

• US 3,670,788 A
• Filed: 05/22/1970
• Issued: 06/20/1972
• Est. Priority Date: 05/22/1970
• Status: Expired due to Term

• Current Assignee: Henry M. Pollak, Robert S. Pollak
• Original Assignee: Henry M. Pollak, Robert S. Pollak
• Inventors: Pollak, Henry M., Pollak, Robert S.
• Primary Examiner(s): Schran, Donald R.
• Application Number:
  US05/039,819
• Time in Patent Office: 760 Days
• Field of Search: 143/35R,36R,36A,36B,36C,36D,36E,36F,36G,33
• US Class Current: 83/508.2
• CPC Class Codes: B27B 5/243 the saw blade being arranged underneath the work-table the circular saw blade arranged underneath a stationary work-table for sawing material in general B23D45/06
• CPC Class Codes: Y10T 83/7697 Tool angularly adjustable relative to work-support
• CPC Class Codes: Y10T 83/7872 Tool element mounted for adjustment

Abstract

An arbor saw that can be moved vertically with respect to the table on which it is mounted and also displaced about a horizontal axis so as to cut a bevel. An integrated linkage is provided for achieving these two functions so that the blade can be displaced vertically without effecting its angle of bevel, but when the blade is displaced about a horizontal axis it is automatically lowered.

Claims

1. A linkage for simultaneously moving a cutting tool about two separate axes of rotation comprising a supporting frame, a bracket pivotally connected to said supporting frame for rotation about one of said axes of rotation, a second axis of rotation defined by said bracket, said second axis being movable with said bracket for rotation about said first axis, cutting means coupled to said bracket for rotation about said second axis, first and second moving means for moving said cutting means about each of said axes, and means coupling said first moving means and said cutting means so that when said bracket is pivoted to move said cutting means about said first axis said connecting means causes said cutting means to rotate about said second axis.

2. A linkage as defined in claim 1 wherein said bracket defines an aperture along said second axis, an elongated member rotatably supported in said aperture, said cutting means being fixed to said elongated member for rotation therewith about said second axis, said first moving means being coupled to said bracket, and said second moving means being coupled to said elongated member.

3. A linkage as defined in claim 2 wherein said elongated member includes a connection point that is radially spaced from said second axis, and said connecting means is a link interconnecting said connection point and said second moving means so that actuation of said second moving means causes said elongated member and said cutting means to rotate about said second axis.

4. A linkage as defined in claim 1 wherein said bracket is mounted for rotation about a horizontal axis, said bracket defining an aperture at its end remote from said axis, an elongated cylindrical shaft mounted in said aperture for rotation about its longitudinal axis, said longitudinal axis and said second axis being coincident, said cutting means including a circular saw blade, and the center of said saw blade being spaced from said second axis.

5. A linkage as defined in claim 4 wherein said cylindrical shaft has a connection point spaced from said longitudinal axis, said second moving means comprises a second control arm pivotally supported to said frame, a juncture on said second control arm adjacent said pivotal support, and said means connecting said first moving means and said cutting means is a link that extends between said connection point and said juncture.

6. A linkage as defined in claim 5 wherein said cylindrical shaft extends through said aperture, said shaft supporting said cutting means on one side of said bracket and a collar on the other side, said collar being fixed to said cylindrical shaft for rotation therewith, said juncture being located on said collar, and the portion of said second control arm that includes said pivotal support and said juncture is disposed at an angle spaced from the vertical so that pivotal movement of said second control arm causes said cylindrical shaft to rotate.

7. An arbor saw having a blade which can be raised and lowered comprising table means, an elongated member, means on said table means for supporting said elongated member for rotation about its axis, a motor and saw blade connected to said elongated member for rotation therewith, a collar fixed to the periphery of said elongated member, said collar defining a connection point radially spaced from said axis, a lever having one end pivotally connected to said table means and having its other end swingable in an arc defined by said pivotal connection, and a link interconnecting said connection point and said lever so that swinging of said lever causes rotation of said elongated member, said motor and said saw blade about said axis.

8. An arbor saw as defined in claim 7 wherein said means for supporting said elongated member is a bracket, said bracket being connected to said table and having an aperture therein, and said elongated member is rotatably supported in saId aperture.

9. A linkage for lowering the saw blade of an arbor saw when the blade is displaced from the vertical comprising a supporting frame, a bracket pivotally connected to said supporting frame for rotation about a first axis of rotation, a second axis of rotation defined by said bracket, said second axis being movable with said bracket for rotation about said first axis, cutting means including said saw blade coupled to said bracket for rotation about said second axis, means for rotating said bracket about said first axis to displace said saw blade from the vertical, and elongated connection means, said connection means having one end pivotally coupled to said frame and its other end pivotally coupled to said cutting means so that when said bracket is rotated about said first axis said connection means and said cutting means cooperate to rotate said cutting means about said second axis to lower said saw blade.