Two identical drivers are utilized for driving an MOS device. Each driver utilizes a differentially configured transistor circuit to allow only one of two output level amplifiers to conduct. A first one of these output level amplifiers utilizes a transistor latching circuit. The second output level amplifier is a Darlington configured transistor pair, which utilizes unidirectional capacitive feedback from the output of the driver to the base of the input transistor of the second output level amp...

A driver for use in orthopedic surgery having a generally elongate housing adapted for single-handed gripping operation. The driver includes an engagement mechanism associated with the housing for releasably engaging the proximal end of a longitudinally extending driven member and includes a driven member, such as a flexible drive spindle, for rotatably driving the engagement mechanism. The driver further includes shield that is supportingly connected with an end of the housing so as to extend c...

A screw having a head and a reduced shank, and having a socket formed therein opening through the outer surface of the head, the socket having a larger portion disposed entirely within the head and being non-circular about the screw axis, and a smaller portion, also non-circular about the screw axis and extending into the shank portion of the screw, and a drive having a bit shaped at its extended end to engage snugly in both portions of the screw socket.

A fastener driver has the inner periphery of its cylindrical fitting recess provided with a plurality of semicylindrical ribs. The center of the cross sectional semicircle of the rib is situated on a radial line passing the center of the cross sectional circle of the fitting recess and within a range of said radial line defined between the latter center and a first intersection of two tangential lines, said tangential lines being tangent to said circle at second intersections where it intersects...

A screw driver having a foot portion on the lower extremity of the blade for increasing the effectiveness of the blade in gripping the sidewalls of a screw slot.

A screw driver having intersecting blade portions each of which includes a foot portion on the lower extremity thereof for increasing the effectiveness of the blade in gripping the sidewalls of intersecting slots in a screw head.

A driver circuit which has low power requirements, a relatively small number of components and provides flexibility in output voltage setting. The driver circuit comprises, essentially, two portions which are selectively activated by the application of input signals. The output signal is determined by which of the two circuit portions is activated. While each of the two circuit portions operates in a manner similar to silicon controlled rectifiers (SCR), the circuit portions are on only when an ...

A pile driver characterized by pile-holding chucks being suspended from the top bed subjected to the oil pressure of a hydraulic cylinder in such a way that the chucks may be brought up to or separated from the top bed; a spring and a cam for stretching or compressing the spring being inserted between the top bed and the chucks; and the downward oil pressure (static load) applied to the top bed being transformed into a dynamic load through expansion and contraction of the spring, to be transmitt...

A screw driver comprising a torque responsive clutch for determining the final tightening torque and an output spindle connected to a forwardly extending screw bit. The spindle is axially displaceable from a forward rest position to an intermediate tightening position and a rear position in which dogs on the spindle engage dogs on the driving part of the clutch for inactivation of the clutch. The spindle, which is spring-biased toward its normal tightening and rest positions, is permitted to reo...

A tubular post driving member telescopes over the post and has an upper end plate to deliver impact to the top of the post. The driving member has sets of handle sockets at different elevations and these sockets receive removable handles in either 180.degree. or 90.degree. spacing circumferentially of the post to permit driving of the post in different situations by two workers or one worker. Additional hand grips are provided for erecting the post and driver and for transporting. An adjustable ...