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US 7,246,533 B2Granted
Reciprocating counterweight structure for a reciprocating saw
AssigneeBlack & Decker Inc.
InventorsMichael Anthony Lagaly, Thomas Arnold Mooty, James Pierce Nichols, Jr., Earl Roger Clowers, Matthew George Popik
Life of this patent
Estimating the term…
Abstract
A counterweight in a reciprocating saw counterbalances a reciprocating shaft assembly adapted to hold a saw blade. The counterweight is supported for reciprocating motion by slides which ride within slots formed in a housing adapted to hold the reciprocating mechanism.
Claims22
A mechanism for converting rotary motion into reciprocating motion comprising:
- a housing;
- a counterweight;
- a reciprocating shaft assembly adapted for reciprocal movement along a longitudinal axis;
- a drive assembly operatively connected to the shaft assembly for driving the shaft assembly in a reciprocal motion, and the drive assembly operatively connected to the counterweight for driving the counterweight in a reciprocal motion;
- and
- a crank gear comprising;
- a first crank gear surface;
- a second crank gear surface substantially parallel to the first crank gear surface;
- a first crank shaft extending eccentrically from the first crank gear surface, the first crank shaft operatively connected to the reciprocating shaft assembly;
- and
- a second crank shaft extending eccentrically from the second crank gear surface, the second crank shaft operatively connected to the counterweight;
- wherein the counterweight comprises a slide which rides in a slot formed on an inside surface of the housing;
- the counterweight slide comprising:
- a first tab extending from the periphery of the counterweight, and
- a second tab extending from the periphery of the counterweight in a direction opposite the first tab with respect to an axis of reciprocating motion, wherein a thickness of at least a portion of the counterweight is greater than a width of the slot in a direction perpendicular to the reciprocal motion of the counterweight.
12 more elements
A mechanism for converting rotary motion into reciprocating motion comprising:
- a housing;
- a counterweight adapted for reciprocal motion;
- a reciprocating shaft assembly adapted for reciprocal movement along a longitudinal axis;
- and
- a drive assembly operatively connected to the shaft assembly for driving the shaft assembly in a reciprocal motion, and the drive assembly operatively connected to the counterweight, the drive assembly comprising:
- a crank gear having a toothed peripheral wall,
- wherein a portion of the counterweight extends around at least a portion of the crank gear peripheral wall;
- wherein the counterweight comprises a slide which rides in at least one slot formed on an inside surface of the housing;
- the counterweight slide comprising:
- a first tab extending from the periphery of the counterweight, and
- a second tab extending from the periphery of the counterweight in a direction opposite the first tab with respect to an axis of reciprocating motion, and
- wherein the drive assembly is operatively connected to a motor, and wherein a thickness of at least a portion of the counterweight is greater than a width of the slot in a direction perpendicular to the reciprocal motion of the counterweight.
9 more elements
A mechanism for converting rotary motion into reciprocating motion comprising:
- a housing at least partially enclosing the mechanism;
- a reciprocating shaft assembly adapted for reciprocal movement along a longitudinal axis;
- a counterweight comprising:
- a first slot adapted to receive a driving shaft for driving the counterweight in a reciprocating motion;
- and
- a first slide adapted to support the counterweight for reciprocating motion,
- the slide comprising a first tab extending from the counterweight in a direction substantially perpendicular to an axis of reciprocating motion,
- the first tab adapted to be received for sliding in a slot formed in the housing,
- wherein the counterweight is adapted to at least partially surround a crank gear;
- and
- a drive assembly operatively connected to the shaft assembly for driving the shaft assembly in a reciprocal motion, and the drive assembly operatively connected to the counterweight, wherein a thickness of at least a portion of the counterweight is greater than a width of the first slot in a direction perpendicular to the reciprocating motion of the counterweight.
8 more elements
Dependencies are inferred from the claim text.