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US 4,240,204 AGranted
Jig saw
AssigneeBlack & Decker Inc.
InventorsRichard E. Walton, II, William D. Sauerwein
Life of this patent
Estimating the term…
Abstract
A portable electric jig saw incorporating an improved lightweight, one-piece saw blade carrier, and an improved floating three-point carrier guide arrangement. The invention is disclosed embodied in both non-orbital and adjustable orbit type jig saws.
Claims18
A drive mechanism for a jig saw, comprising:
- a casing having a motor horizontally disposed therein;
- a generally vertically disposed saw blade carrier vertically reciprocable by said motor and having means at its lower end for attaching a saw blade;
- means defining an upper carrier support comprising a support surface in said casing slidingly engaged by the upper portion of said saw blade carrier;
- means defining a lower carrier support comprising a saw blade guide attached to said casing and positioned to engage the trailing edge of a reciprocating saw blade attached to said saw blade carrier;
- means defining an intermediate carrier support comprising guide means in said housing for biasing said saw blade carrier toward said support surface and a saw blade attached to said carrier against said saw blade guide, whereby said support surface and said saw blade guide determine the reciprocal axis of said saw blade carrier and saw blade;
- a rotary crank plate drivingly connected to said motor;
- and
- said support surface being disposed on said crank plate.
5 more elements
A drive mechanism for a jig saw comprising:
- a casing having a motor disposed therein:
- a rotary crank plate drivingly connected to said motor and having a relatively flat support surface disposed in a plane perpendicular to the axis of rotation thereof;
- an eccentrically disposed crank pin affixed to said crank plate;
- a saw blade carrier having a head end with an aperture therethrough in which said crank pin is drivingly disposed, and means at the opposite end for attaching a saw blade,
- said head end of said saw blade carrier being in engagement with and positioned by said support surface;
- a saw blade guide attached to said casing and positioned to engage the trailing edge of a reciprocating saw blade attached to said saw blade carrier;
- and
- guide means in said casing for biasing said saw blade carrier toward said support surface and a saw blade attached to said saw blade carrier toward said saw blade guide, whereby said support surface and saw blade guide determine the reciprocal axis of said saw blade carrier and saw blade.
5 more elements
A drive mechanism for a jig saw comprising:
- a casing having a motor disposed therein;
- a rotary crank plate drivingly connected to said motor and having a relatively flat support surface disposed in a plane perpendicular to the axis of rotation thereof;
- an eccentrically disposed crank pin affixed to said crank plate and projecting outwardly from said support surface;
- an elongated saw blade carrier having a head end with an aperture therethrough in which said crank pin is drivingly disposed and an opposite end for attaching a saw blade,
- said aperture being larger than said crank pin and said head end being offset from the remainder of said saw blade carrier in a direction toward said support surface,
- said blade carrier being rockable in a fore-and-aft direction with said head end engaging said support surface;
- and
- guide means in said casing for biasing said saw blade carrier toward said support surface in all positions of said carrier.
5 more elements
A drive mechanism for a jig saw comprising:
- a casing having a motor disposed therein;
- a rotary crank plate drivingly connected to said motor and having a relatively flat support surface disposed in a plane perpendicular to the axis of rotation thereof;
- an eccentrically disposed crank pin affixed to said crank plate and projecting outwardly from said support surface;
- an elongated saw blade carrier having an enlarged head end with an aperture therethrough in which said crank pin is drivingly disposed and an opposite end for attaching a saw blade,
- said aperture being larger than said crank pin and said head being offset axially from the remainder of said saw blade carrier in a direction toward said support surface,
- said blade carrier being rockable in a fore-and-aft direction with said head end engaging said support surface;
- a pair of transversely spaced guide surfaces in said casing engaging the transverse sides of said head end of said saw blade carrier for limiting transverse movement thereof;
- a pair of transversely spaced bearing surfaces in said casing disposed in opposed relationship with respect to said support surface,
- said bearing surfaces and said support surface having said head end of said saw blade carrier disposed therebetween and cooperating with one another to limit rotation of said saw blade carrier about its own axis;
- a saw blade guide attached to said casing and positioned to engage the trailing edge of a reciprocating saw blade attached to said saw blade carrier;
- and
- guide means in said casing for biasing said saw blade carrier toward said support surface and a saw blade attached to said saw blade carrier toward said saw blade guide,
- whereby said support surface and saw blade guide determine the reciprocal axis of said saw blade carrier and saw blade.
10 more elements
Dependencies are inferred from the claim text.