초록 ▼

An apparatus is described for driving fasteners or for other impacting applications. The apparatus comprises a cylinder, a piston slidably mounted in the cylinder, a hammer connected to the piston, an air reservoir, an air manifold or supply chamber connected to the air reservoir, a quick-acting pop

An apparatus is described for driving fasteners or for other impacting applications. The apparatus comprises a cylinder, a piston slidably mounted in the cylinder, a hammer connected to the piston, an air reservoir, an air manifold or supply chamber connected to the air reservoir, a quick-acting poppet valve for rapidly admitting high pressure air on command to the upper end of the cylinder from the air reservoir, a trigger-operated control valve adapted (1) to transmit high pressure air to the poppet valve from the air manifold so as to cause the poppet valve to close off the upper end of the cylinder or (2) to exhaust high pressure air from the poppet valve so as to cause the poppet valve to open, and an exhaust control valve adapted to (1) transmit high pressure air from the air reservoir to the lower end of the cylinder so as to cause the piston to retract the hammer when the poppet valve is closed or (2) to exhaust air from the underside of the piston when the poppet valve is open and high pressure air from the air reservoir causes the piston to drive the hammer through its impact stroke. A safety mechanism is provided to control operation of the exhaust control valve and, as an optional feature, a safety mechanism may be provided to releasably lock the trigger.

대표청구항 ▼

An improved fastener driving apparatus comprising: a hollow housing having first and second opposite ends; a cylinder mounted within said housing and extending between said first and second opposite ends, said cylinder having first and second opposite ends and the interior of said housing being divi

An improved fastener driving apparatus comprising: a hollow housing having first and second opposite ends; a cylinder mounted within said housing and extending between said first and second opposite ends, said cylinder having first and second opposite ends and the interior of said housing being divided into a first chamber located between said housing and said cylinder and a second chamber within and defined by said cylinder; first and second end means closing off said first ends of said housing and said cylinder respectively, said second end means defining a first opening communicating with the interior of said cylinder; a hammer disposed so as to be movable lengthwise through said first opening between a first retracted position and a second extended position; a piston slidably mounted within said cylinder for driving said hammer from one to the other of its said first and second positions; a first passageway communicating with the interior of said cylinder at said first end thereof, third end means including a poppet valve closing off said second end of said housing, said poppet valve including a hollow valve casing and a poppet valve member comprising piston means slidably mounted in said valve casing for reciprocal movement between a first position wherein said poppet valve member is spaced from said cylinder and said second chamber is open to said first chamber via said second end of said cylinder and a second position wherein said poppet valve member engages said second end of said cylinder and closes off said second chamber from said first chamber; a third chamber having an inlet for connection to a supply of pressurized air and an outlet communicating with said first chamber; a second opening connecting said first passageway with said first chamber; an exhaust port in said housing connecting with said first passageway; a first control valve for selectively blocking flow of air between said first passageway and either said second opening or said exhaust port; means defining at least one second passageway for transmitting air from said third chamber to the interior of said poppet valve casing so as to exert air pressure on said piston means in a direction to urge said poppet valve member to its said second position; and a second control valve for selectively (a) blocking flow of air from said third chamber to said second passageway and for simultaneously venting air from said second passageway and said valve casing, whereby when said first control valve blocks flow of air between said first passageway and said second opening, the pressure of air in said first chamber forces said piston means to move said poppet valve member to said first position and forces said piston to drive said hammer to its second extended position, and (b) resuming flow of air to said second passageway from said third chamber and stopping the venting of air from said second passageway and said valve casing whereby (1) flow of air in said second passageway to said poppet valve casing causes said piston means to move said poppet valve member to its said second position and (2) when said first control valve blocks flow of air between said first passageway and said exhaust port said piston is forced under the pressure of air in said first chamber to drive said hammer back to its said first position.