Bearing structure for a reciprocating shaft in a reciprocating saw
AssigneePorter-Cable/Delta
InventorsMichael Anthony Lagaly, Thomas Arnold Mooty, James Pierce Nichols, Jr., Earl Roger Clowers, Matthew George Popik
Life of this patent
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Abstract
A reciprocating shaft assembly in a reciprocating saw moves in a reciprocal motion and drives a saw blade via a blade holder. At least one bore is formed in an end of the reciprocating shaft assembly opposite the blade holder. A pin fixed to the saw passes through the bore and acts as a bearing to support the reciprocating shaft assembly in its reciprocating motion.
Claims31
A reciprocating shaft and bearing combination for a reciprocating saw comprising:
- a housing;
- a first pin fixed to the housing;
- a reciprocating shaft assembly having a blade holder at a first end thereof for holding a saw blade, the reciprocating shaft assembly moving in a reciprocating motion relative to the first pin and parallel to an axis of motion;
- the reciprocating shaft assembly also having at least a first bore formed in a second end thereof opposite the first end, the axis of the first bore being formed parallel to the axis of motion and a portion of the first pin being positioned inside the first bore;
- a shaft bearing fixed to the housing, the shaft bearing surrounding a portion of the reciprocating shaft assembly intermediate the first end and the second end of the reciprocating shaft assembly;
- and
- wherein the first pin supports the reciprocating shaft assembly as a bearing during its reciprocating motion.
A reciprocating shaft and bearing combination for a reciprocating saw comprising:
- a housing;
- a first pin fixed to the housing;
- a reciprocating shaft assembly having a blade holder at a first end thereof for holding a saw blade, the reciprocating shaft assembly moving in a reciprocating motion relative to the first pin and parallel to an axis of motion;
- the reciprocating shaft assembly also having at least a first bore formed in a second end thereof opposite the first end, the axis of the first bore being formed parallel to the axis of motion and a portion of the first pin being positioned inside the first bore;
- wherein the first pin supports the reciprocating shaft assembly as a bearing during its reciprocating motion;
- a main body housing at least partially enclosing the housing, the main body housing including a handle portion, the housing being supported inside of the main body housing;
- and
- wherein the housing encloses and seals a portion of the reciprocating shaft assembly having the first bore, a portion of the reciprocating shaft assembly moving in and out of the housing during the reciprocating motion.
A drive assembly for a reciprocating saw, the reciprocating saw comprising a housing having a handle portion and a neck portion, a rotary motor, and a switch on the handle portion for controlling the rotary motor, wherein the drive assembly converts rotary motion of the rotary motor into reciprocating motion, the drive assembly comprising:
- a reciprocating shaft assembly having a blade holder at a front portion thereof for holding a saw blade, an elongated slot at a rear portion thereof, and a mid portion between the front portion and the rear portion, the reciprocating shaft assembly moving in a reciprocating motion to permit the saw blade to cut a workpiece;
- a crank gear with an eccentric crank mounted thereon, the eccentric crank received in the elongated slot, the eccentric crank moving the reciprocating shaft assembly reciprocally forwards and backwards in its reciprocating motion as the crank gear rotates, and moving reciprocally from a left side of the elongated slot to an opposite right side;
- a front shaft bearing surrounding the mid portion of the reciprocating shaft assembly;
- a first rear bearing mounted on the reciprocating shaft assembly on the left side of the lateral slot;
- and
- a second rear bearing mounted on the reciprocating shaft assembly on the right side of the lateral slot.
A drive assembly for a reciprocating saw, the reciprocating saw comprising a housing having a handle portion, a rotary motor, and a switch on the handle portion for controlling the rotary motor, wherein the drive assembly converts rotary motion of the rotary motor into reciprocating motion, the drive assembly comprising:
- a reciprocating shaft assembly having a blade holder at a front portion thereof for holding a saw blade, an elongated slot at a rear portion thereof, and a mid portion between the front portion and the rear portion, the reciprocating shaft assembly moving in a reciprocating motion parallel to an axis of motion to permit the saw blade to cut a workpiece;
- a crank gear with an eccentric crank mounted thereon, the eccentric crank received in the elongated slot, the eccentric crank moving the reciprocating shaft assembly reciprocally forwards and backwards in its reciprocating motion as the crank gear rotates, and moving reciprocally from a left side of the elongated slot to an opposite right side;
- a front shaft bearing surrounding the mid portion of the reciprocating shaft assembly;
- a first pin;
- and
- at least a first bore formed in the rear portion of the reciprocating shaft assembly, the axis of the first bore being formed parallel to the axis of motion and a portion of the first pin being positioned inside the first bore.
Dependencies are inferred from the claim text.