Atlas Copco Tools Ab

Atlas Copco Aktiebolag

Erik Roland Rahm

Sven P Westerberg

A torque responsive release clutch intended for a power nutrunner and comprises a driving clutch half () and a driven clutch half () coupled to each other for torque transfer by means of axially directed teeth (), wherein one of the clutch halves is axially movable between an engagement position and a release position against the action of a bias spring (). Each one of the teeth () of one of the clutch halves () has a substantially prismatic shape and extends axially from a base portion () to a top portion () and comprises two surfaces () which form between them a ridge (). The base portion () of the tooth () has a radial extent from an inner diameter (dto an outer diameter (d), and the ridge () extends from the inner diameter (dat the base portion () to the outer diameter (d) at the top portion (). The contact points between teeth () of the driving clutch half () and the teeth () of the driven clutch half () are arranged to travel along the ridge () during the release sequence of the clutch, whereby the torque coupling of the clutch is transferred via a smaller diameter at the beginning of the release sequence than at the end thereof. This means that the dynamic torque additive emanating from the inertia of the movable clutch half at the beginning of the release movement is added to a torque level that is lower than that at the end of the release sequence.

Torque responsive release clutch for a power nutrunner

A portable power tool is provided which includes a rotation motor (), an output shaft (), a gearing () and a drive spindle () connecting the gearing () to the motor (). A drive line arresting lock device () is provided to facilitate loosening and/or tightening of a working implement mounting device (), and a releasable safety clutch () is provided between the lock device () and the gearing () for protecting the gearing () against transmission of detrimental excessive torque magnitudes manually applied on the output shaft/mounting device ().

Portable power tool with rotating output shaft and overload protection

A pneumatic power nut runner with a rotation motor which is connected to a drive train including a torque responsive release clutch () and a disengageable torque non-responsive clutch (), a pressure air inlet valve (), and an activation mechanism () for automatic power shut-off at the attainment of a desired maximum torque level. The activation mechanism () comprises a transversely displaceable latch element () provided with a blind bore () for permitting closure of the inlet valve () and a depression () for allowing engagement of the torque non-responsive clutch (), wherein a transverse displacement of the latch element () at the attainment of the desired torque level results in a freeing of the inlet valve () for displacement toward closed position and a forcing of the torque non-responsive clutch () out of engagement.

Pneumatic power nut runner with automatic shut-off

Power nutrunner with torque release clutch and a setting tool

Power nutrunner

Handle for a pneumatic power tool

Pneumatic power tool

A power screw driver for tightening self-tapping screws comprises a housing (10), a rotation motor, an output shaft (12), a torque limiting release clutch (11) having torque transferring cam unit (17, 19) and a spring biassed thrust element (20) exerting an engagement force on the cam unit (17, 19) and yielding axially to a release position as a desired output torque is reached. A screw bed (32) engaging contact member (31) coupled is to an activation unit (42) and is arranged to be axially displaced via the activation unit (42) of the activation means (42) a lock means (36, 39) from a thrust element (20) locking position during the thread forming phase of the tightening process to a thrust element (20) unlocking position during the final pretensioning phase.

Power screw driver

A pneumatic power nutrunner comprises a housing (10), a rotation motor (19), an air inlet passage (15), a torque limiting release clutch (20) located between the motor (19) and an output shaft (13), which clutch (20) includes overriding cam elements (24, 25) spring biassed via a thrust sleeve (26), and a shut-off valve (30) in the air inlet passage (15) axially supported by an activating rod (32, 36) which by its forward end engages a latch (40) radially displaceable into a recess (42) in the thrust sleeve (26) for releasing the activating rod (32, 36) and the shut-off valve (30) for axial displacement at clutch release. The shut-off valve (30) comprises a pneumatic actuator (31, 34) for accomplishing an extension of the axial displacement of the activating rod (32, 36) at part closure of the shut-off valve (30). Cam elements (39, 43) on the activating rod (32, 36) and the thrust sleeve (26) are arranged to cooperate with the latch (40) to accomplish an extension of the thrust sleeve (26) displacement at clutch release and closure of the shut-off valve (30).

Phenmatic power nutrunner

A pneumatic power tool includes a housing (10), a motor (14), an air inlet passage (23) in the housing (10) communicating with the motor (14), a pistol type handle (12) extending from the housing (10) perpendicularly to the application direction of the tool, and an air communication arrangement (16, 20, 23) for connecting the air inlet passage (23) to a pressure air supply conduit connected to the tool, wherein the air communication arrangement (16, 20, 23) is separated from the handle (12) and comprises an air supply passage forming member (16) connected to the rear part of the housing (10), and an exhaust air passage (25, 26) having an outlet portion (26) coaxially disposed relative to the air supply passage forming member (16).

Screw joint tightening power tool, comprising a rotation motor (13), a power control (34), and a torque responsive override clutch (15) coupling the motor (13) to an output shaft (16). A power control (34) actuating mechanism is associated with the clutch (15) and comprises a push rod (36) which in an ON-position rests axially against a transversely movable latch (41) and is released for axial displacement toward an OFF-position at relative rotation between the driving and driven halves (20, 22) of the clutch (15). The actuating mechanism further comprises balls (45) which are disposed in peripheral pockets (48) in one of the clutch halves, either of which balls (45) is arranged to cooperate with the latch (41) to shift the latter to a push rod (36) releasing position to, thereby, make the power control (34) shut off the power supply to the motor (13) as the clutch (15) overrides at a desired torque level.

Screw joint tightening power tool

A screw tightening power tool, comprising a rotation motor, a power supply (27) connected to the motor, an output shaft (13), a torque responsive release clutch (14) including a driving half (16) and a driven half (17) and coupling the motor to the output shaft (13), an activating rod (26) coupled to the power supply (27), a latch means (24) associated with one of the clutch halves (16) and cooperating with the activating rod (26), and a cam (30) associated with the other of the clutch halves (17) and operatively connected to the latch (24) for making the latch shift from an activating rod (26) supporting position to an activating rod (26) releasing position as the transferred torque has reached the actual preset release torque level of the clutch. The cam (30) comprises a spindle (30) which is rotatively supported relative to the driven clutch half (17) for a limited rotational movement relative thereto.

Screw tightening power tool

A two-speed power transmission for a power tool comprises a housing (10), an input shaft (20), an output shaft (15), a planetary gear (18) and a torque responsive gear shift mechanism (19) for directing torque through the planetary gear (18) in a high torque/low speed drive mode or past the planetary gear (18) in a low torque/high speed drive mode. The gear shift mechanism (19) comprises a driving member (26) connected to the sun wheel (21) of the planetary gear (18), a driven member (27) connected to the output shaft (15), and a number of axially movable coupling elements (30) arranged to intercouple in a first position the driving member (26) and the driven member (27) and intercouple in a second position the planet wheel carrier (24) of the planetary gear (18) and the driven member (27). The coupling elements (30) are continuously supported in the radial direction by an axially extending coupling sleeve (28) formed in one piece with the planet wheel carrier (24). A first cam (35) on the driving member (26) exerts an axial force on the coupling elements (30) against the action of a biassing spring (31) to move the coupling elements (30) from the first to the second positions, and a second cam (36b) on the driven member (27) for exerting an axial shifting force upon the coupling elements (30) toward the second positions of the coupling element (30) as they have left their first positions.

Two-speed power transmission for a power tool

In a pneumatic screw driver including a reversible vane motor (11) a rotatable directional valve (30) is located at the rear end wall (13) of the motor (11) and arranged to distribute motive pressure air to two alternative air inlet ports (22, 23) of the motor (11). The directional valve (30) includes a valve element (31) which comprises a first portion (32) and a second portion (36). The first portion (32) has a plane contact surface for sealing cooperation with the motor end wall (13) and separates the exhaust air venting passage (25) from the air supply passage (19, 34, 35). The second portion (36) is cylindrical and carries two axially spaced seal rings (39, 40) between which there is mounted a radial coupling pin (44) connecting the valve element (31) to a manoeuver ring (47) rotatably supported on the outside of the housing (10).

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Vasby, Sweden

Erik Roland Rahm