Abstract: A hand-held power screwdriver includes a low-noise torque clutch (5) for transmitting torque to a tool spindle (4) and formed of claw clutch (6) and ratchet clutch (7), with the ratchet clutch (7) having a rotatably driven first ratchet member (7a) and a second ratchet member (7b) both having, respectively, oppositely oriented, circumferentially arranged, oblique cams (9), with the claw clutch (6) having a first claw member (6a) and a second claw member (6b) having oppositely oriented claws (11), respectively, the first claw member (6a) of the claw clutch (6) being fixedly connected with the second ratchet member (7b) of the ratchet clutch (7) for joint rotation therewith, and with the screwdriver further including at least one engagement member (12) for connecting the second claw member (6b) with the tool spindle (4) for joint rotation therewith and for disconnecting the claw member (6b) from the tool spindle (4) and a retaining element for connecting the second claw member (6b) of the claw clutch (6) with t

Abstract: A fastener guide (6) for use in a power-operated drive in device (4), particularly of a stand-up tool (2), having a guide path (16) in which a plurality of fasteners (14) can be received and which has a device-side opening (18) and a free opening (20), the guide path (16) being curved toward the device-side opening (18) proceeding from the free opening (20). The fastener guide (6) can be mounted on the drive in device (4) in a detachable manner by connection means, and the guide path (16) has a fall-out prevention device (26, 48) at each of the two openings (18, 20).

Abstract: A hand-held power screwdriver includes a low-noise torque clutch (5) for transmitting torque to a tool spindle (4) and formed of claw clutch (6) and ratchet clutch (7), with the ratchet clutch (7) having a rotatably driven first ratchet member (7a) and a second ratchet member (7b) both having, respectively, oppositely oriented, circumferentially arranged, oblique cams (9), with the claw clutch (6) having a first claw member (6a) and a second claw member (6b) having oppositely oriented claws (11), respectively, the first claw member (6a) of the claw clutch (6) being fixedly connected with the second ratchet member (7b) of the ratchet clutch (7) for joint rotation therewith, and with the screwdriver further including at least one engagement member (12) for connecting the second claw member (6b) with the tool spindle (4) for joint rotation therewith and for disconnecting the claw member (6b) from the tool spindle (4) and a retaining element for connecting the second claw member (6b) of the claw clutch (6) with t

Abstract: A power-operated drive-in device (2) with a drive-in tool (13) for fasteners (15) and a head piece (4) which is arranged at an outlet opening (10) of a guide pipe (12) of the drive-in device (2) and has a holding device (44) that automatically receives and releases fasteners (15) which are fed to the head piece (4) via the guide pipe (12). The head piece (4) has a rotatable connection to the rest of the drive-in device (2).

Abstract: A fastener guide (6) for use in a power-operated drive in device (4), particularly of a stand-up tool (2), having a guide path (16) in which a plurality of fasteners (14) can be received and which has a device-side opening (18) and a free opening (20), the guide path (16) being curved toward the device-side opening (18) proceeding from the free opening (20). The fastener guide (6) can be mounted on the drive in device (4) in a detachable manner by connection means, and the guide path (16) has a fall-out prevention device (26, 48) at each of the two openings (18, 20).

Abstract: A screw driving tool including an axially displaceable, drive spindle (5) located in the housing, a bit holder (6) having a shank (7) which releasably connects the bit holder (6) with the drive spindle (5), an axially adjustable depth stop (9) surrounding the bit holder (6) and a portion of the drive spindle (5) and connectable with the tool housing (1), and a sleeve-shaped dust-repelling member (13) arranged between the depth stop (9) and the bit holder (6) and releasably connected with the bit holder (6).

Abstract: An electrically driven hand-held tool including a housing (2; 12; 22; 32), an electromotor (20; 30; 40), a gear set for transmitting rotation of an output shaft of the electromotor to a drive spindle, and a fan-wheel all arranged in the housing (2; 12; 22; 32), with the fan-wheel providing, during operation of the tool, for aspiration of air through the suction openings (6; 16; 26; 36) formed in the housing for directing the aspirated air past the electromotor and the gear set for cooling same, and for expelling warm air, which was heated as a result of absorbing heat generated by the electromotor and the gear set during the operation of the tool, out of the housing (2; 12; 22; 32), and a warm air channel (7; 17; 27; 37) arranged downstream of the electromotor and the gear set and spaced from a tool handle (3; 13; 23; 33) and having a plurality of blow-out openings (8; 18; 28; 38) arranged in such a way that during use of the hand-held tool, the expelled warm air flows in a direction away from the tool operat

Abstract: A screw driving tool including an axially displaceable, drive spindle (5) located in the housing, a bit holder (6) having a shank (7) which releasably connects the bit holder (6) with the drive spindle (5), an axially adjustable depth stop (9) surrounding the bit holder (6) and a portion of the drive spindle (5) and connectable with the tool housing (1), and a sleeve-shaped dust-repelling member (13) arranged between the depth stop (9) and the bit holder (6) and releasably connected with the bit holder (6).

Abstract: A depth stop for a hand-held screw driving tool including a housing, a drive located in the housing for rotating a spindle about a spindle axis, and a chuck for receiving a working tool, connected with the housing and projecting from the housing in an axial direction defined by the spindle axis with the depth stop (3; 10; 16; 22) including a sleeve-shaped element for surrounding the chuck, connectable with the tool housing (2) and having at lease one axially extending opening formed in a wall of the sleeve-shaped element and piercing the wall through an entire wall thickness, and with the opening having, at its end remote from the housing (2) an entrance region (7; 21; 25) open in the axial direction.

Abstract: A screwdriver is disclosed, comprising a removable depth stop which selectably either, when equipped with the depth stop, allows noiseless shutoff or, with the depth stop removed, allows torque-dependent shutoff, without any chattering occurring when the machine continues to run. To this end, an adjustable torque-dependent release clutch is combined with an entrainment clutch of known type, which is additionally preceded by a disconnect clutch, a locking means being provided in order to hold a throwout ring, which forms one of the two elements of the disconnect clutch, in a predetermined position under load. In this way, noiseless operation is ensured after release, both when working with the depth stop and in the case of torque-dependent shutoff, with the depth stop removed.

Abstract: A power tool has a drive mechanism with an output shaft which performs an intermittent rotary motion. The output shaft drives, via an overrunning clutch, a tool drive shaft to drive a tool, which thus performs a quasi-continuous rotary motion that, as the load on the machine increases, transitions increasingly into a discontinuous rotary motion. The power tool can advantageously be used as a hand-held power tool for screwing, drilling, sawing, sanding, and the like, a high output torque with a low reaction torque being achievable as a result of the intermittent drive mechanism.

Abstract: A three-dimensional adjustable ceiling suspension for a surgical microscope includes a first platform for holding the surgical microscope and a second platform connected to a ceiling disposed above and in spaced relationship to the first platform. Six extendable connecting elements interconnect the two platforms. Six lower articulating joints connect the connecting elements to the first platform and six upper articulating joints connect the connecting elements to the second platform. The lower articulating joints are disposed on the first platform along an imaginary first circle and the upper articulating joints are disposed on the second platform along an imaginary second circle. A plurality of drive units are connected to corresponding ones of the extendable connecting elements. A computer-supported drive makes it possible to freely select the position of the surgical microscope as well as realize a rotation and inclination about an imaginary fixed point lying in the center of the object field.

Abstract: The invention concerns a retaining device for an angled head (10, 11) that is driven by a drive (1) especially a drilling gun, in which the drive unit (1) has a receiving connector (2) to receive the angled head (10, 11). To allow adjustment of the angular position of the angled head with respect to the drive unit, a socket (31) that can be screwed onto threads (33) of the receiving connector (2) is provided to receive the angled head (10, 11). Pins (21) which can be displaced axially in order to retain or release balls (25) are provided in the socket (31). The receiving connector (2) has on its outer surface a plurality of lengthwise grooves (29) in which the balls are held (25). When the pins (21) are displaced axially the balls (25) are released, so that the socket (31) can rotate relative to the receiving connector (2) until the balls (25) engage in corresponding lengthwise grooves ( 29) and are retained by the pins.

Abstract: A motor-driven machine with variable torque setting includes a motor, a planetary gearing driving a work spindle and a rotatably mounted internal gear actuating a motor de-energizer against the action of a spring force when a settable limit torque is exceeded. To achieve a compact design, a torsion spring element extending in the axial direction alongside the planetary gearing is provided for generating the spring force. The torsion spring element carries a swivel element at one end which engages a cam on the internal gear and is held at an opposite end in a support so that the swivel element can swivel out of an initial position against the action of the force of the torsion spring element to de-energize the motor.

Abstract: An electric tool with a source of power that is independent of the line and with a transmission housing or motor housing that is also designed to function as a grip, with another grip merging into one side of it. To position the center of gravity such that the tool will be easier to handle and to allow the operator to continue working when one battery pack goes dead, attachments for battery packs are provided at the end of each grip.

Abstract: A clutch for power screwdrivers. It has a transmission, an adjustable bit stop, and a drive shaft. It also has a cogwheel with cams on one face and a clutch disk with catches on one face mounted on the drive shaft. The object is a low-noise, wear-resistant clutch. The drive shaft is in one piece. An intermediate disk with catches on one face and cams on the other face is positioned between the cogwheel and the clutch disk. A spring mechanism is positioned between the cogwheel and the intermediate disk.

Abstract: The invention relates to an arrangement for test mark positioning in spheric perimeters particularly for use in ophthalmological examinations. A semi-spherical perimeter screen has a central portion upon which a fixed mark is projected by a double projector the back-projection of which is indicated upon a visual field chart which permits recording of said back-projected fixed mark. A further projector connected to the displaceable visual field chart carrier produces discrete test marks via light cables around the central portion of said screen. Thus it is feasible to continuously detect the visual field of a patient's eye by cooperation between the patient's eye, the fixed mark and the discrete marks and by respective displacements of the projectors and hence the marks involved.