초록 ▼

A percussion tool is described and which includes a housing mounting a tool bit; a reciprocally moveable hammer borne by the housing and which is operable to repeatedly strike the tool bit; and a reciprocally moveable piston enclosed within the hammer and which imparts reciprocal movement to the rec

A percussion tool is described and which includes a housing mounting a tool bit; a reciprocally moveable hammer borne by the housing and which is operable to repeatedly strike the tool bit; and a reciprocally moveable piston enclosed within the hammer and which imparts reciprocal movement to the reciprocally moveable hammer.

대표청구항 ▼

The invention claimed is: 1. A percussion tool, comprising: a housing defining a passageway having first and second ends and which further mounts a tool bit which has a proximal and a distal end, and wherein air is received within the passageway; a hammer which is reciprocally moveably mounted with

The invention claimed is: 1. A percussion tool, comprising: a housing defining a passageway having first and second ends and which further mounts a tool bit which has a proximal and a distal end, and wherein air is received within the passageway; a hammer which is reciprocally moveably mounted within the passageway as defined by the housing, and having a main body defining a first internal passageway, and which is positioned in substantially coaxial alignment relative to the tool bit, and wherein air is received within the first internal passageway, and wherein the main body further has a first end which is operable to repeatedly strike the tool bit, and an opposite second end defining an end wall which has an aperture formed therein and which mounts a seal; a reciprocally moveable piston received in the first internal passageway of the reciprocally moveable hammer, and wherein the air which is received within the first internal passageway can periodically pass by the piston, and be exchanged with the air which is received in the passageway defined by the housing; a piston rod having a first end which is mounted on the piston, and an opposite second end, and wherein the piston rod reciprocally moves, at least in part, through the aperture formed in the side wall, and is sealably engaged by the seal; a motor coupled to the second end of the reciprocally moveable piston rod and which is operable to move the piston along a defined path of travel within the first internal passageway, and wherein the movement of the piston causes the first end of the hammer to reciprocally move and repeatedly strike the proximal end of the rotatable tool bit, while simultaneously causing the air which is received within the passageway defined by the housing to be compressed; an air passageway which fluidly couples the first end of the passageway defined by the housing with the second end of the passageway, and wherein air within the air passageway can move from the first end of the housing to the second end of the housing to equalize air pressure within the housing; and a valve disposed in fluid metering relation relative to the air passageway. 2. A percussion tool as claimed in claim 1, and further comprising: a drive linkage having a first end which is coupled in force receiving relation relative to the motor, and a second end which is disposed in force transmitting relation relative to the second end of the reciprocally moveable piston rod, and wherein the drive linkage is enclosed within the housing, and wherein the drive linkage is wholly received within the passageway defined by the housing. 3. A percussion tool as claimed in claim 2, and wherein the drive linkage further comprises: a first portion having a first end which is disposed in force receiving relation relative to the motor, and an opposite second end; and a second portion having a first end which is rotatably attached to the second end of the first portion, and an opposite second end which is affixed to the reciprocally moveable piston. 4. A percussion tool as claimed in claim 3, and wherein the first and second portions each have a length dimension, and wherein the second portion has a length dimension greater than the first portion. 5. A percussion tool as claimed in claim 4, and wherein the proximal end of the tool bit is received in the passageway as defined by the housing, and wherein the reciprocal movement of the piston causes the reciprocally moveable hammer to move along a path of travel and to repeatedly strike the tool bit. 6. A percussion tool as claimed in claim 4, and wherein the proximal end of the tool bit is received in the passageway defined by the housing, and is disposed in spaced relation relative to the first end of the passageway, and wherein the reciprocally moveable hammer under the influence of the reciprocally moveable piston, repeatedly strikes the proximal end of the tool bit, and wherein the air passageway permits air which is captured between the first end of the passageway and the reciprocally moveable hammer to escape from the passageway defined by the housing, and be returned to the passageway at a location between the second end of the passageway and the reciprocally moveable hammer. 7. A percussion tool as claimed in claim 1, and wherein the piston rod has an exterior facing surface, and wherein a channel is formed in the exterior facing surface of the piston rod at a location intermediate the opposite first and second ends thereof, and wherein the channel couples the first internal passageway, which is defined by the hammer, in fluid flowing relation relative to the passageway as defined by the housing, and wherein the channel permits air, which is captured between the second end of the hammer, and the reciprocally moveable piston, to escape from the first internal passageway, and by the seal, at least in part, when the piston, under the influence of force applied by the piston rod, draws the piston in the direction of the second end of the hammer, and which further allows air from the passageway defined by the housing to pass into the first internal passageway when the piston rod applies force to the piston to move the piston in the direction of the first end of the hammer. 8. A percussion tool as claimed in claim 1, and wherein the motor is a high voltage and/or high frequency electrical motor. 9. A percussion tool as claimed in claim 8, and further comprising: a voltage or frequency converter which is operable to receive a low voltage and/or frequency power source and convert it into a high voltage and high frequency power output, and wherein the high voltage and high frequency power output is supplied to the high voltage or high frequency electrical motor. 10. A percussion tool as claimed in claim 9, and wherein the voltage or frequency converter is positioned remotely relative to the high voltage and high frequency electrical motor, and wherein an electrical conduit electrically couples the voltage or frequency converter to the high voltage and high frequency electrical motor. 11. A percussion tool as claimed in claim 1, and wherein the tool bit is rotatable relative to the housing, and wherein the motor is coupled in rotatable driving relation relative to the tool bit. 12. A percussion tool, comprising: a tool bit having a proximal and a distal end; a housing which is defined by a sidewall, and which has opposite first and second ends, and wherein the sidewall of the housing defines an internal passageway, and wherein the tool bit is mounted on the first end of the housing, and the proximal end of the tool bit is received in the internal passageway of the housing; a reciprocally moveable hammer having a main body with a first end, and an opposite second end, and an exterior and interior facing surfaces, and wherein the interior facing surface defines a passageway which extends substantially between the first and second ends of the main body, and wherein the reciprocally moveable hammer is reciprocally moveable along a given path of travel along the internal passageway as defined by the housing, and wherein the reciprocally movable hammer has an end wall which mounts a seal, and wherein the seal defines an aperture; a reciprocally moveable piston received within the passageway which is defined by the interior facing surface of the reciprocally moveable hammer, and wherein the piston further includes a piston rod which is mounted on the piston, and wherein a portion of the piston rod extends through the aperture defined by the seal and is sealably engaged by the seal, and is further received within the internal passageway as defined by the housing; a drive linkage having a first end, and an opposite second end, and wherein the drive linkage is substantially completely enclosed within the internal passageway as defined by the housing; an electrical motor disposed in force transmitting relation relative to the first end of the drive linkage, and further in rotatable driving relation relative to the tool bit, and wherein energizing the electrical motor causes reciprocal motion to be imparted to the reciprocally moveable piston, and wherein the reciprocal movement of the piston has the effect of imparting reciprocal motion to the reciprocally moveable hammer so as to cause the first end of the reciprocally moveable hammer to repeatedly strike the proximal end of the tool bit, and rotation of the tool bit; a voltage or frequency converter positioned remotely relative to the electrical motor and which is electrically coupled to a source of power, and wherein the voltage or frequency converter provides a voltage output which is supplied to the electrical motor to energize same; an air passageway which couples the first end of the housing with the second end thereof, and wherein air is captured in the internal passageway defined by the housing, and between the first end of the hammer and the first end of housing, and wherein the air passageway couples the internal passageway near the first end of the housing, with the internal passageway located near the second end of the housing, and wherein the reciprocal movement of the hammer causes the captured air to be delivered to the internal passageway at a location which is between the second end of the housing and the second end of the reciprocally moveable hammer; and a valve disposed in fluid metering relation relative to the air passageway. 13. A percussion tool as claimed in claim 12, and wherein the passageway defined by the interior facing surface of the reciprocally moveable hammer is periodically coupled in fluid flowing relation relative to the internal passageway as defined by the housing. 14. A percussion tool as claimed in claim 12, and wherein a second air passageway couples the internal passageway as defined by the housing, and which is located between the second end of the housing, and the second end of the hammer, with ambient, when the reciprocally moveable hammer is moving in a direction along the internal passageway to strike the proximal end of the tool bit. 15. A percussion tool, comprising: a reciprocally moveable hammer which has an internal sidewall defining a first passageway, first and second ends, and an end wall which defines an aperture, and wherein a seal is mounted on the end wall and defines the aperture; a reciprocally moveable piston enclosed within the moveable hammer and which is reciprocally movable along a path of travel within the first passageway, and which imparts reciprocal movement to the moveable hammer; a reciprocally movable piston rod mounted on the reciprocally movable piston, and which further has an exterior facing surface which has a channel formed therein, and wherein the piston rod extends through the aperture, and the seal engages the piston rod; a housing having opposite first and second ends and defining a second passageway, and wherein the reciprocally moveable hammer is received within the second passageway and moves along a reciprocal path of travel between the first and second ends of the housing under the influence of the reciprocally movable piston, and wherein the channel formed in the piston rod periodically permits the exchange of air between the second passageway of the housing and the first passageway defined by the reciprocally movable hammer; a tool bit mounted on the first end of the housing, and wherein a portion of the tool bit is received within the second passageway, and wherein the reciprocally moveable hammer repeatedly strikes the portion of the tool bit received within the second passageway as the hammer reciprocally moves along the reciprocal path of travel; an air passageway having a first end which is located between the first end of the reciprocally moveable hammer and near the first end of the housing, and a second end which is located between the second end of the housing and the second end of the reciprocally moveable hammer, and wherein the air passageway allows air which is captured therebetween the first end of the reciprocally moveable hammer and the first end of the housing to travel along the air passageway and be received within the second passageway at a location between the second end of the housing and the second end of the reciprocally moveable hammer as the reciprocally moveable hammer moves along the second passageway; and a valve disposed in fluid metering relation relative to the air passageway.