A power tool includes a tool head having a working element and a powerhead configured to provide power to the working element. The powerhead includes a fluid tank configured to hold a combustible fuel and defines an initial internal volume having an internal pressure. A diaphragm is formed of a flexible material and forms at least a portion of the fluid tank. The diaphragm moves from an unexpanded state to an expanded state when a temperature of the combustible fuel increases above a threshold value. Movement of the diaphragm to the expanded state increases the internal volume of the fluid tank to allow the internal pressure of the fluid tank to remain approximately constant.

A power tool includes a tool head having a working element and a powerhead configured to provide power to the working element. The powerhead includes a fluid tank configured to hold a combustible fuel and defines an initial internal volume having an internal pressure. A diaphragm is formed of a flexible material and forms at least a portion of the fluid tank. The diaphragm moves from an unexpanded state to an expanded state when a temperature of the combustible fuel increases above a threshold value. Movement of the diaphragm to the expanded state increases the internal volume of the fluid tank to allow the internal pressure of the fluid tank to remain approximately constant.

An accumulator includes a tank body having a communication port that communicates the lubricant accommodating space capable of accommodating lubricant with the outside, the tank body extending around an axis, a piston that moves in the axial direction in the tank body to vary the size of the lubricant accommodating space, a spiral spring mechanism having a spiral spring, and a rotational force transmission member that converts a linear movement of the piston into a rotational force around the axis to transmit the converted rotational force. The rotational force transmission member converts a rotational movement due to a restoring force of the spiral spring into a force in the axial direction to move the piston in the axial direction.

An accumulator includes a tank body having a communication port that communicates the lubricant accommodating space capable of accommodating lubricant with the outside, the tank body extending around an axis, a piston that moves in the axial direction in the tank body to vary the size of the lubricant accommodating space, a spiral spring mechanism having a spiral spring, and a rotational force transmission member that converts a linear movement of the piston into a rotational force around the axis to transmit the converted rotational force. The rotational force transmission member converts a rotational movement due to a restoring force of the spiral spring into a force in the axial direction to move the piston in the axial direction.

A lubricator for receiving a reciprocating plunger has (a) an elongate lubricator body with an inner bore, a lower inlet passage and a side outlet port; (b) an upper lubricator assembly capping an upper end of the lubricator body; and (c) a sleeve extending the length of the lubricator body, and having an outside diameter smaller than an inside diameter of the inner bore, defining an annular flow passage which is in fluid communication with the side outlet port. The sleeve defines an upper hole allowing fluid communication between an inner volume of the sleeve and the annular flow passage, and a lower hole allowing fluid communication between an inner volume of the sleeve and the annular flow passage.

A lubricator for receiving a reciprocating plunger has (a) an elongate lubricator body with an inner bore, a lower inlet passage and a side outlet port; (b) an upper lubricator assembly capping an upper end of the lubricator body; and (c) a sleeve extending the length of the lubricator body, and having an outside diameter smaller than an inside diameter of the inner bore, defining an annular flow passage which is in fluid communication with the side outlet port. The sleeve defines an upper hole allowing fluid communication between an inner volume of the sleeve and the annular flow passage, and a lower hole allowing fluid communication between an inner volume of the sleeve and the annular flow passage.

A wire lubrication applicator has: a cylindrical body with opposed open axial ends along a wire travel axis, the cylindrical body formed of inner and outer hollow tubes that each define a longitudinal wire insertion slot extending between the opposed open axial ends, with the inner and outer hollow tubes being coaxially mounted to rotate relative to one another about the wire travel axis to align and misalign the longitudinal wire insertion slots to open and close, respectively, a lateral wire entry into a lubricant retaining interior of the inner hollow tube; and one or more end caps that are on the cylindrical body and each form an axial wire opening. One or more of the axial wire openings are biased to radially constrict about a wire in use.

A wire lubrication applicator has: a cylindrical body with opposed open axial ends along a wire travel axis, the cylindrical body formed of inner and outer hollow tubes that each define a longitudinal wire insertion slot extending between the opposed open axial ends, with the inner and outer hollow tubes being coaxially mounted to rotate relative to one another about the wire travel axis to align and misalign the longitudinal wire insertion slots to open and close, respectively, a lateral wire entry into a lubricant retaining interior of the inner hollow tube; and one or more end caps that are on the cylindrical body and each form an axial wire opening. One or more of the axial wire openings are biased to radially constrict about a wire in use.

An object of the present invention is to provide a chain guide that can improve functional properties of a chain drive system. The chain guide of the present invention is attached to an engine block by a mounting bolt and slidably guides a running chain. The chain guide includes a mounting part provided with a shaft hole through which a mounting bolt is passed, and an oil jet passage for injecting lubricating oil, supplied to the shaft hole at a predetermined pressure, toward the chain.

An automatic lubrication system for lubricating an object is provided, which includes a lubricant container configured to contain a lubricant and including a rotatable shaft with a piston to dispense the lubricant from an output of the lubricant container, a housing with a coupling section coupled with the lubricant container, an electric motor configured to drive the rotatable shaft of the lubricant container during at least one lubrication action, such that at least a part of the lubricant is dispensable from the lubricant container during the at least one lubrication action, at least one capacitive sensor including at least one electrode, wherein the at least one capacitive sensor is arranged at a wall of the lubricant container and configured to provide at least one sensor signal indicative of a capacitance in a vicinity of the at least one electrode, and a control circuitry configured to determine, based on the at least one sensor signal of the at least one capacitive sensor, at least one lubrication parameter indicative of the at least one lubrication action.