A fastener driving tool is capable of not only linearly driving but also rotationally fastening a fastener into a workpiece P. The fastener driving tool includes a housing 2, a nose portion 40 formed with an injection passage 40a through which a fastener 41 is driven, a magazine 4 accommodating fast
A fastener driving tool is capable of not only linearly driving but also rotationally fastening a fastener into a workpiece P. The fastener driving tool includes a housing 2, a nose portion 40 formed with an injection passage 40a through which a fastener 41 is driven, a magazine 4 accommodating fasteners 41 and supplying a fastener 41 to the nose portion 40, a push lever 5 movable relative to the housing 2 upon depression against the workpiece P, combustion chamber frames 12, 22 movable in the housing 2 in accordance with the movement of the push lever 5, and first and second cylinders 7, 8 fixed to the housing 2. First and second pistons 71, 81 are movably disposed in the first and second cylinders 7,8, respectively, and a bit 9 extends from the first piston 71. A rod 14 formed with a rack 14A extends from the second piston 72. The rack 14A is engageable with a motion conversion mechanism 6 for converting a linear motion of the rod 14 into rotational motion of the bit 9.
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1. A fastener driving tool comprising: a housing;a cylinder including a first cylinder fixed to the housing and a second cylinder fixed to the housing;a combustion chamber frame movable in the housing and defining a combustion chamber in cooperation with the cylinder;a first piston slidably reciproc
1. A fastener driving tool comprising: a housing;a cylinder including a first cylinder fixed to the housing and a second cylinder fixed to the housing;a combustion chamber frame movable in the housing and defining a combustion chamber in cooperation with the cylinder;a first piston slidably reciprocally movable relative to the first cylinder and displaced upon expansion of air/fuel mixture in the combustion chamber;a second piston slidably reciprocally movable relative to the second cylinder and displaced upon expansion of air/fuel mixture in the combustion chamber;a bit extending from the first piston and having a base end portion supported to the first piston and rotatable about its axis, and having a free end portion engageable with a fastener, the bit being linearly movable in accordance with the movement of the first piston;a rod extending from the second piston and having a rack, the rod being linearly movable in accordance with the movement of the second piston; anda motion conversion mechanism having a first part engageable with the rack, and a second part engaged with the bit for converting the linear movement of the rod into a rotational movement of the bit. 2. The fastener driving tool as claimed in claim 1, further comprising: a magazine connected to the housing for accommodating the fastener and for guiding movement of the fastener to a fastening position; anda push lever movable relative to the housing upon depression to a workpiece, andwherein the combustion chamber frame is movable in the housing in accordance with the movement of the push lever, andwherein the first piston selectively provides the combustion chamber in accordance with the movement of the combustion chamber frame, andwherein the second piston selectively provides a combustion chamber in accordance with the movement of the combustion chamber frame, andwherein the free end portion of the bit is engagable with the fastener positioned at the fastening position. 3. The fastener driving tool as claimed in claim 2, wherein the rack is configured to be positioned on the rod so that a start timing of the engagement between the rack and the first part is later than a start timing of the linear movement of the bit, whereby the rotation of the bit is started after elapse of a predetermined time period during which the bit linearly drives the fastener into the workpiece by a predetermined depth. 4. The fastener driving tool as claimed in claim 2, wherein the housing comprises a first housing, and a second housing connected thereto; and wherein the combustion chamber frame comprises a first combustion chamber frame disposed within the first housing, and a second combustion chamber frame disposed within the second housing, andwherein the first cylinder is configured to guide the movement of the first combustion chamber frame, and the second cylinder is configured to guide the movement of the second combustion chamber frame. 5. The fastener driving tool as claimed in claim 4, further comprising a link having one end pivotally movably connected to the push lever and having another end pivotally movably connected to the second combustion chamber frame, the link providing a tilting posture changeable in accordance with the movement of the push lever, the first combustion chamber frame being movable in accordance with a movement of the push lever, and the second combustion chamber frame being movable in accordance with a movement of the push lever through the link. 6. The fastener driving tool as claimed in claim 4, further comprising a first ignition plug disposed in the first housing and providing a first ignition timing; anda second ignition plug disposed in the second housing and providing a second ignition timing later than the first ignition timing such that a start timing for starting engagement of the rack with the first part of the motion converting mechanism occurs after the fastener has been driven into a workpiece by a predetermined amount by the bit. 7. The fastener driving tool as claimed in claim 4, wherein the first cylinder defines a first cylinder chamber and has a first opening, a first combustion chamber being defined in cooperation with a portion of the first cylinder including the first opening, and a fuel being injected into the first combustion chamber; and the fastener driving tool further comprising;a first cylinder head disposed to confront the first opening and defining the first combustion chamber upon contact with the first combustion chamber frame;a first fan rotatably provided at the first cylinder head and exposed to the first combustion chamber; and,a drive control device that controls rotation of the first fan such that the first fan rotates at a first rotation speed during gas exhaust and air suction phases in the first combustion chamber, and the first fan rotates at a second rotation speed lower than the first rotation speed or the rotation of the first fan is stopped when the fuel is introduced into the first combustion chamber and the fuel is combusted in the first combustion chamber. 8. The fastener driving tool as claimed in claim 7, wherein the second cylinder defines a second cylinder chamber and has a second opening, a second combustion chamber being defined in cooperation with a portion of the second cylinder including the second opening, and a fuel being injected into the second combustion chamber; and the fastener driving tool further comprising:a first ignition plug exposed to the first combustion chamber for igniting the fuel in the first combustion chamber; anda second ignition plug exposed to the second combustion chamber for igniting the fuel in the second combustion chamber, the first ignition plug being ignited prior to an ignition of the second ignition plug. 9. The fastener driving tool as claimed in claim 8, further comprises: a second cylinder head disposed to confront the second opening and defining the second combustion chamber upon contact with the second combustion chamber frame; and,a second fan rotatably provided at the second cylinder head and exposed to the second combustion chamber; andwherein the drive control device further controls rotation of the second fan. 10. The fastener driving tool as claimed in claim 1, wherein the first cylinder and the second cylinder are juxtaposed with each other in a single housing, each of the first cylinder and the second cylinder having one end portion and another end portion. 11. The fastener driving tool as claimed in claim 10, wherein the combustion chamber is a single combustion chamber provided at each one end portion of the first cylinder and the second cylinder; and wherein the first cylinder and the second cylinder are juxtaposed with each other in the single combustion chamber frame such that the first cylinder and the second cylinder are configured in combination to guide a movement of the single combustion chamber frame. 12. The fastener driving tool as claimed in claim 11, wherein the first piston and the second piston are simultaneously movable toward their bottom dead centers; and wherein the rack is so positioned on the rod that a timing for starting engagement of the rack with the first part of the motion converting mechanism occurs after the fastener has been driven into a workpiece by a predetermined amount by the bit. 13. The fastener driving tool as claimed in claim 10, further comprising a retard mechanism that causes a start timing of moving the second piston from one end portion of the second cylinder to the another end portion of the second cylinder to be later than a start timing of moving the first piston from one end portion of the first cylinder to the another end portion of the first cylinder. 14. The fastener driving tool as claimed in claim 13, wherein the combustion chamber is a single combustion chamber provided at each one end portion of the first cylinder and the second cylinder; and wherein the first cylinder defines therein a first cylinder chamber, and the second cylinder defines therein a second cylinder chamber, the first cylinder chamber and the second cylinder chamber being in communication with the single combustion chamber. 15. The fastener driving tool as claimed in claim 13, wherein the first cylinder defines an axial direction; and wherein the rod has an engagement portion providing a locus in accordance with the movement of the second piston (281) between the one end portion and the another end portion of the second cylinder; andwherein the retard mechanism comprises an actuator movable in a direction crossing the axial direction, between a protruding position and a retracting position, at the protruding position the actuator being engaged with the engagement portion to prevent the rod from moving from the one end portion toward the another end portion of the second cylinder during an initial moving phase of the first piston from the one end portion toward the another end portion of the first cylinder, and at the retracting position the actuator being retracted from the locus to permit the rod from moving past the actuator from the one end portion toward the another end portion of the second cylinder at a timing later than a timing of starting the movement of the first piston toward the another end portion of the first cylinder. 16. The fastener driving tool as claimed in claim 13, wherein the first cylinder defines therein a first cylinder chamber, and also defines an axial direction; and wherein the rod has an engagement portion providing a locus in accordance with the movement of the second piston between the one end portion and the another end portion of the second cylinder; andwherein the retard mechanism comprises a stop member and a biasing member;the stop member being movable between a protruding position and a retracting position and having a pivot shaft portion pivotally movably supported to the cylinder and extending in a direction perpendicular to the axial direction; a first arm extending from the pivot shaft portion and movable between the protruding position protrudable into the first cylinder chamber and the retracting position retractable therefrom; and a second arm extending from the pivot shaft portion and movable between the protruding position engageable with the engagement portion at the protruding position of the first arm and the retracting position retracting from the locus at the retracting position of the first arm, the first piston being abuttable against the first arm while the first arm is at the protruding position when the first piston is moved from the one end portion to the another end portion of the first cylinder to move the first arm and the second arm to the retracting position; andthe biasing member being interposed between the cylinder and the stop member and biasing the stop member toward the protruding position. 17. The fastener driving tool as claimed in claim 13, wherein the first cylinder and the second cylinder define therein a first cylinder chamber, and a second cylinder chamber, respectively; and wherein the retard mechanism comprises a fluid passage section having a first opening open to the first cylinder chamber and a second opening open to the second cylinder chamber for providing a fluid communication between the first cylinder chamber and the second cylinder chamber, the first opening being positioned such that the first piston shuts off fluid communication between the combustion chamber and the first opening when the first piston is positioned at the one end portion of the first cylinder, and the first piston firstly allows the first opening to communicate with the combustion chamber when the first piston is moved toward the another end portion of the first cylinder by a predetermined distance, the second cylinder chamber being commuicatable with the combustion chamber through only the fluid passage section. 18. The fastener driving tool as claimed in claim 17, wherein the retard mechanism further comprises a partition wall partitioning an upper space of the second cylinder chamber above the second piston from the combustion chamber to prevent the second piston from moving toward the another end portion of the second cylinder during initial combustion state in the combustion chamber.
Sollberger Roger W. (5614 Beechmont Ave. Cincinnati OH 45230) Webb Walter J. (5117 Colerain Ave. Cincinnati OH 45223), Portable electric fastener driving apparatus.
Doherty James E. (Barrington IL) Veoukas Stanley C. (Wheeling IL) Wendling Ernest J. (Algonquin IL), System for controlling energy output of combustion-powered, fastener-driving tool.
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