US 9,919,450 B2Granted

Log splitter

AssigneeYTL International Inc.I

InventorsSongFu Hu, Steve Vanderburgh

Life of this patent

Estimating the term…

Abstract

A log splitter having an activation lever and a safety lever that defines a pawl configured to engage with a detent associated with the activation lever in an unactivated position so that the activation lever cannot be rotated unless the safety lever is first rotated out of a safety position to remove the pawl from the detent.

Claims9

Dependent claims

A log splitter comprising:

a flywheel for receiving rotational energy from a motor;
a sliding ram for applying a force to split wood;
a rack gear attached to the sliding ram;
a pinion gear having a longitudinal axis and being engageable with the rack gear to drive the rack gear;
an activation lever, configured to rotate about the axis of the pinion gear from an unactivated position to an activated position, wherein:
the activation lever is connected to a cylindrical element defining a detent;
the activation lever is connected to a pin that is configured to slide within a slot, the slot being angled to the axis of the pinion gear to include a directional component that is parallel to the axis of the pinion gear;
wherein, the pin is operably connected to a first cog, the first cog being in permanent rotational engagement with the pinion gear and being configured to be rotationally engageable with a second cog that is in permanent rotational engagement with the flywheel;
whereby, when the activation lever is rotated from the unactivated position to the activated position, the pin is moved axially to engage the first cog with the second cog, thereby to rotationally engage the flywheel with the rack gear and to move the rack gear in a distal direction;
a safety lever that defines a pawl and being biased, in a safety position, to engage the pawl with the detent when the activation lever is in the unactivated position so that the activation lever cannot be rotated unless the safety lever is first rotated out of the safety position to remove the pawl from the detent;
a block operably connected to the rack gear;
a rocker arm having a first end and a second end and being configured to rock about a fixed pin located between the first end and the second end;
wherein:
the block is aligned so that, when the rack gear moves distally, the block also moves distally to push the first end of the rocker arm distally and thus the second end of the rocker arm proximally;
and
the second end is aligned in relation to the activation lever so that the second end, when moved proximally, moves the activation lever to the unactivated position thereby aligning the detent with the pawl to allow the safety lever to assume the safety position, and also thereby moving the pin axially to disengage the first cog from the second cog to disengage the flywheel from the rack gear.

13 more elements

Dependencies are inferred from the claim text.

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Abstract

A log splitter comprising:

a flywheel for receiving rotational energy from a motor;
a sliding ram for applying a force to split wood;
a rack gear attached to the sliding ram;
a pinion gear having a longitudinal axis and being engageable with the rack gear to drive the rack gear;
an activation lever, configured to rotate about the axis of the pinion gear from an unactivated position to an activated position, wherein:
the activation lever is connected to a cylindrical element defining a detent;
the activation lever is connected to a pin that is configured to slide within a slot, the slot being angled to the axis of the pinion gear to include a directional component that is parallel to the axis of the pinion gear;
wherein, the pin is operably connected to a first cog, the first cog being in permanent rotational engagement with the pinion gear and being configured to be rotationally engageable with a second cog that is in permanent rotational engagement with the flywheel;
whereby, when the activation lever is rotated from the unactivated position to the activated position, the pin is moved axially to engage the first cog with the second cog, thereby to rotationally engage the flywheel with the rack gear and to move the rack gear in a distal direction;
a safety lever that defines a pawl and being biased, in a safety position, to engage the pawl with the detent when the activation lever is in the unactivated position so that the activation lever cannot be rotated unless the safety lever is first rotated out of the safety position to remove the pawl from the detent;
a block operably connected to the rack gear;
a rocker arm having a first end and a second end and being configured to rock about a fixed pin located between the first end and the second end;
wherein:
the block is aligned so that, when the rack gear moves distally, the block also moves distally to push the first end of the rocker arm distally and thus the second end of the rocker arm proximally;
and
the second end is aligned in relation to the activation lever so that the second end, when moved proximally, moves the activation lever to the unactivated position thereby aligning the detent with the pawl to allow the safety lever to assume the safety position, and also thereby moving the pin axially to disengage the first cog from the second cog to disengage the flywheel from the rack gear.

13 more elements