Portable sawing device utilizing a circular power saw

Claim 1

A portable sawing device which utilizes a circular power saw and which is adapted to be detachably secured to a workpiece support bench constructed of wood and consisting of an extended, flat, broad, horizontal section defining a workpiece support surface, and a similarly extended, narrow, flange section secured along the rearward edge thereof, defining a workpiece abutting or rip fence, said portable sawing device comprising: a frame comprising a plurality of frame members; frame attaching means for detachably securing the frame against the underside of the workpiece support bench; a saw supporting arm, cantilvered forwardly and horizontally over the workpiece support bench from a vertical support column upwardly disposed behind the bench; a saw support member for supporting a power saw thereon; means for engaging a power saw on the saw support member; means for securing a power saw to the saw support member; pivotal attaching means, for attaching the saw support member to a bearing means at the forward part of the saw supporting arm, permitting the pivotal movement of the saw support member with a power saw thereon about a substantially horizontal axis between a fully lowered cutting position generally spaced from and parallel to the workpiece support surface and a raised, non-cutting, tilted-up position above the workpiece support surface to allow placement, positioning, and removal of a workpiece; means for upwardly biasing the saw support member with a power saw thereon to the raised, non-cutting position; slidable carriage means carrying the vertical support column and slidably mounted below the frame by means permitting horizontal back and forth movement whereby a power saw supported on the saw support member may be reciprocated in conjunction with the saw supporting arm to traverse a workpiece supported on the workpiece support bench to effect a cut on the workpiece; means for adjustably and rigidly securing the vertical support column to the slidable carriage means permitting upward and downward adjustment of the support column; carriage mounting means slidably receiving the carriage means and pivotally attached to the underside of the frame permitting the horizontal rotational movement of the carriage means about a vertical axis whereby the saw supporting arm may be aligned at various lateral cutting angles to the longitudinal axis of the workpiece support bench and, by means provided, locked in fixed relation to the frame at desired lateral cutting angles; means for determining desired lateral cutting angles; means for quickly locating selected lateral cutting angles; means for releasably locking the slidable carriage means in fixed relation to the carriage mounting means; bearing means, attached to the forward part of the saw supporting arm and bearing the pivotal attaching means of the saw support member, permitting the rotational movement of the attached saw support member and a power saw thereon about a vertical axis from a lateral cutting position parallel to the longitudinal axis of the saw supporting arm to a rip cutting position perpendicular to the longitudinal axis of the saw supporting arm; means for restraining the saw support member and a power saw thereon in the fully lowered cutting position when in the rip cutting position; means for releasably locking the bearing means in fixed relation to the saw supporting arm when in the lateral cutting position and when in the rip cutting position; means for permitting the rotation of the bearing means about a horizontal axis parallel to the longitudinal axis of the saw supporting arm whereby the horizontal pivotal axis of the pivotal attaching means of the saw support member may be rotated from the horizontal position and the plane of the saw blade tilted from a vertical cutting position to bevel angle cutting positions; means for determining desired bevel cutting angles; means for releasably locking the bearing means at the vertical and rotated bevel angle cutting positions; and means for limiting the extent of rotation of the bearing means about the horizontal axis parallel to the longitudinal axis of the saw supporting arm.