Saws and blades therefor

Claim 2

A saw comprising: a hollowed casing; an eccentric rotary drive member housed in said casing; an elongated blade-carrying mechanism having a first end portion and an intermediate portion housed in said casing, and a second end portion extending freely from said casing; one of said first end portion and said intermediate portion being coupled with said drive member for rotation thereby in orbital manner relative to the axis of rotation of said drive member; the other of said first end portion and said intermediate portion being constrained by said casing for longitudinal tranSlation and pivotal movement in a plane parallel to that of said orbital motion; and an elongated blade releasably connected with said mechanism second end portion to extend longitudinally therefrom, said blade having teeth which extend in a sequence at least around the free end and along one side of the free end of said blade.

Claim 3

A saw according to claim 1 wherein said rotary drive member is a shaft formed integrally with a drive spindle extending from one end of said shaft parallel to, but radially off-set from the longitudinal axis of said shaft; and said mechanism one portion is recessed to receive said drive spindle.

Claim 4

A saw according to claim 1 wherein said mechanism other portion and the adjacent portion of said casing are each formed with mutually facing recesses, and a guide spindle is coupled at its opposite ends with said recesses, one of said recesses engaging wholly around said guide spindle in a driving connection, and the other of said recesses being enlarged relative to said spindle to allow said longitudinal translation and pivotal movement.

Claim 5

A saw according to claim 1, wherein said casing comprises a main tubular body portion and a hollow generally flat nose portion, and said mechanism comprises a generally strip form blade carrier member of which the major surfaces are in longitudinal sliding engagement with said nose portion, but the nose portion hollow is wider than said member to allow said pivotal movement.

Claim 6

A saw according to claim 4 wherein said nose portion extends from said main body portion parallel to the longitudinal axis, but from one side, of the latter, and wherein said rotary drive member is one of two shafts of which one extends along the axial direction, and the other in the radial direction, of said main body portion, said shafts being drivably coupled by bevel gears.

Claim 7

A saw according to claim 4 wherein, between said intermediate and second end portions, said carrier member has opposed recesses in its side edges, a passageway communicating said opposed recesses, two piston-like sealing blocks respectively located in said opposed recesses, and an elongate member extending through said passageway to engage said blocks and maintain the latter engaged with said nose portion.

Claim 8

A saw according to claim 1 wherein said mechanism second end portion comprises a plate connectable thereto to clamp said blade therebetween, and two laterally spaced pins projecting from said second end portion towards said plate, one of said pins being longer than the other, said other pin being chamfered at its free end to taper convergently towards the free end of said second end portion, and said plate being recessed to receive said pins; and wherein said blade is of strip-form at its end clamped by said plate, such end having a longitudinal open-ended slot and an aperture which are mutually laterally spaced and respectively receive said one and other pins.

Claim 9

A saw according to claim 7 wherein said mechanism second end portion and plate are connectable by a screw member passing therethrough in off-set manner towards one side of said mechanism, said one pin is similarly off-set in longitudinal alignment with said screw member relative to said mechanism, and said other pin is laterally off-set towards the other side of said mechanism.

Claim 10

A saw comprising: a hallowed casing; an eccentric rotary drive member housed in said casing; an elongated blade-carrying mechanism having a first end portion and an intermediate portion housed in said casing, and a second end portion extending freely from said casing; one of said first end portion and said intermediate portion being coupled with said drive member for rotation thereby in orbital manner relative to the axis of rotation of said drive member; a pivot member extending transversely between said casing and the other of said first end portion and said intermediate portion to couple the same, with one of said casing and said other portion being slotted longiTudinally of said mechanism to receive said pivot; and an elongated blade releasably connected with said mechanism second end portion to extend longitudinally therefrom, said blade having teeth which extend in a sequence at least around the free end and along one side of the free end of said blade.

Claim 11

A saw comprising: a hallowed casing; an eccentric rotary drive member housed in said casing; an elongated blade-carrying mechanism having a first end portion and an intermediate portion housed in said casing, and a second end portion extending freely from said casing; one of said first end portion and said intermediate portion being coupled with said drive member for rotation thereby in orbital manner relative to the axis of rotation of said drive member; a pivot member extending transversely between said casing and the other of said first end portion and said intermediate portion to couple the same, with one of said casing and said other portion being slotted longiTudinally of said mechanism to receive said pivot; and an elongated blade releasably connected with said mechanism second end portion to extend longitudinally therefrom, said blade having teeth which extend in a sequence at least around the free end and along one side of the free end of said blade.