Abstract: A lathe capable of shortening a spindle with respect to a spindle axis direction. A spindle provided with a chuck at the front end thereof is rotatably supported on a support by bearings. A chuck operating apparatus includes a tilt claw and a shifter. A built-in motor is disposed between the bearings to rotate the spindle. The claw is provided outside the spindle and between the bearings. The claw has a movable end whose distance from the spindle axis varies between a first posture to bring the chuck into the opened state and a second posture to bring the chuck into the closed state. The shifter is provided outside the claw and movable in the spindle axis direction to be brought in a first position to bring the claw into the first posture and in a second position to bring the claw into the second posture.

Abstract: A segment collet, which includes at least two clamping segments, each of which has a receptacle, in which a coupling ring is accommodated, which connects the clamping segments to each other. A securing device is provided to connect the coupling ring to the clamping segments for the purpose of limiting the axial mobility of the clamping segments relative to the coupling ring as well as to fix their circumferential position. The invention furthermore relates to a coupling ring for a segment collet.

Abstract: A drilling tool is disclosed. The drilling tool includes a drilling stub, a cutting element attached to the drilling stub, and a fastening section for fastening onto a tool holder. The fastening section is divided into at least one guide region and one locking region, where at least one interlocking geometry, which protrudes in the axial direction beyond the remaining locking region, and which in particular is a bulge, is designed for transmission of a torque from the tool holder to the drilling tool, and the at least one interlocking geometry has two abutting surfaces each in the tangential direction. One first abutting surface of the two abutting surfaces is designed essentially parallel to a longitudinal axis of the drilling tool and the first abutting surface serves to transmit the torque.

Abstract: A clamping device for a cutting tool assembling and disassembling apparatus capable of preventing the cutting tool from falling off, comprises: a support seat and a carrying frame rotatably attached to the support seat. A cutting tool carrying seat is fixed on the carrying frame and includes an abutting portion with an abutting surface, a connecting portion to be inserted in the carrying frame, and annular portion. An elastic member is sleeved on the annular portion, in the annular portion are formed two receiving holes for holding a ball, respectively. On an inner surface of the annular portion is formed a flange. A connecting member is sleeved on the annular portion to cover the elastic member, the connecting member includes a slanted surface, below the slanted surface is formed an annular shoulder portion. A ring cover is disposed at a top of the annular portion of the carrying seat.

Abstract: A chuck includes a shaft, a ring, a ball and an elastic helical ferrule. The shaft includes a cavity defined therein and an aperture in communication with the cavity. The aperture includes a large open end and a small open end. The ring includes a tunnel for receiving the shaft. The ball includes a first portion for insertion in the tunnel via the large open end of the aperture and a second portion for insertion in the cavity via the small open end of the aperture. The elastic helical ferrule includes sections for contact with the ball and sections in contact with the shaft.

Abstract: A holder for a bit is disclosed. The bit may include a first locking element. The holder may include a housing; a base assembly including a first hole; a second locking element partially disposed within the first hole and configured to move between a locking position in which the second locking element engages the first locking element to prevent removal of the bit, and an unlocking position in which the second locking element is spaced from the first locking element allowing the bit to be removed; and a follower assembly contained within the housing and configured to move relative to the housing and base assembly between a first position in which the follower assembly supports the second locking element in the locking position, and a second position in which the follower assembly allows the second locking element to move from the locking position to the unlocking position.

Abstract: Disclosed is a chuck including a body, at least one ball and a helical spring. The body includes an axial space defined therein and at least one radial bore with a small open end near the axial space and a large open end in an external side thereof. The ball includes a first section movably placed in the radial bore, a second section movable into the axial space, and a third section movably placed outside the radial bore. The helical spring is placed around the body and in contact with the third section of the ball for biasing the second section of the ball into a recess defined in a bit inserted in the axial space.

Abstract: A chuck includes a chuck body extending along a longitudinal axis, the chuck body including a plurality of slots each arranged at an oblique angle with respect to the longitudinal axis. A plurality of jaws each includes a first engagement portion, a jaw end, and a drive end. Each of the jaws is disposed within one of the plurality of slots and is movable between a close position and an open position. A biasing member is coupled to the plurality of jaws and is operable to bias the plurality of jaws toward the close position and a rotating assembly is selectively engageable with the plurality of jaws such that when engaged, the plurality of jaws are movable in response to rotation of the rotating assembly.

Abstract: A tube holder for a tube filling machine includes a cup-shaped housing having a tube receptacle that opens towards the top and into which one end area of a tube can be inserted. At least one vertical groove is formed in the area of the inner wall of the tube receptacle into which a clamping element is inserted, wherein the clamping element can be radially displaced substantially perpendicularly to the longitudinal central axis of the tube receptacle and is pivotably disposed about a pivot axis that extends substantially tangentially relative to the inner wall of the tube receptacle. A clamping force that acts radially from the outside onto the inserted tube can be applied by the clamping element under the action of upper and lower spring elements. The pivot axis is thereby formed on a pivot bearing which permits radial displacement of the pivot axis.

Abstract: A holder for a bit is disclosed. The bit may include a first locking element. The holder may include a housing; a base assembly including a first hole; a second locking element partially disposed within the first hole and configured to move between a locking position in which the second locking element engages the first locking element to prevent removal of the bit, and an unlocking position in which the second locking element is spaced from the first locking element allowing the bit to be removed; and a follower assembly contained within the housing and configured to move relative to the housing and base assembly between a first position in which the follower assembly supports the second locking element in the locking position, and a second position in which the follower assembly allows the second locking element to move from the locking position to the unlocking position.

Abstract: A motor element for a dental medical handpiece or a motor spindle has an elongated shank, rotatably mounted in which there is a drive shaft and a longitudinally-extending rod, a tool-holder for a tool within the rod, and a disconnectable coupling between the rod and the tool-holder. A locking element secures the coupling to prevent the coupling from becoming disconnected from the elongated shank. The locking/unlocking of the coupling is effected by a relative movement between the tool-holder and the tool.

Abstract: The invention relates to a tool holder for an electric tool, particularly for a chisel hammer and/or drill hammer. A tool receptacle is provided for receiving a cylindrical shaft of an insertion tool introduced through an insertion opening. The cylindrical shaft has at least two diametrically opposed detent depressions on its circumferential surface. The tool holder further has a locking device having at least one locking element, at least one blocking element and at least one restoring element. According to the invention, the locking device has at least two locking elements. Upon insertion of the cylindrical shaft of the insertion tool, the restoring element applies different forces to the locking elements of the locking device.

Abstract: A chuck for accommodating a collet chuck, comprising a housing and a chucking tool seat that is assigned to the housing. The chucking tool seat is embedded in the housing as a separate part via an intermediate filling that is made of polymer concrete for connecting the chucking tool seat and the housing. This design has improved properties regarding damping and the total weight while flat sub-areas that are composed of individual guiding plates can additionally be used as clamping areas of the chucking tool seat. Thus a pyramid-type joint is obtained, which could previously be created with the required precision only by using a lot of effort when producing the same from solid material.

Abstract: A tool retaining device includes a housing having an engaging hole and having a chamber for slidably receiving a tool stem, the tool stem includes a socket opening for receiving a tool member which is also slidably engaged in the engaging hole of the housing, for allowing the tool member to be rotated by either the tool stem or the housing. The tool member may also be moved relative to the housing for changeably coupling tool members or tool bits having different lengths, and may be selectively moved into the housing, for allowing another tool element to be selectively engaged with the engaging hole of the housing when the tool member is moved into the housing.

Abstract: In the case of a motor element, in particular of dental technical handpiece or a motor spindle, which at least in its front region has an elongated shank, rotatably mounted in which there is a hollow drive shaft, arranged in whose front end region there is a collet chuck for a tool that is connected in its rear end region by means of a coupling to a rod that extends towards the rear and is pretensioned towards the rear or towards the front by means of the force of a spring and can be displaced towards the front or towards the rear against the force of the spring by means of an actuating mechanism, with the spring being stayed on the draw rod towards the rear and being stayed against an inner first shoulder of the drive shaft towards the front, arranged at the front end region of the spring there is at least one supporting element that is elastically pretensioned radially outwards and springs out behind the shoulder when the draw rod is pushed with the spring from the front into the drive shaft, and the suppor

Abstract: A clamping assembly is disclosed that includes a tapered collar extending radially inward towards an axis. A clamping sleeve is movable along the axis relative to the tapered collar. The clamping sleeve includes flexible arms. An actuator is coupled to the clamping sleeve and is configured to move the clamping sleeve along the axis between extended and retracted positions. A collet is supported relative to the sleeve. The collet includes a body having an axially extending opening configured to receive the material and circumferential fingers arranged about the opening. The clamping sleeve forces the fingers radially inward with the clamping sleeve in the extended position to clamp and hold the material. The biasing member urges the fingers radially outward with the clamping sleeve in the retracted position. Replaceable inserts can also be secured to each finger facing the opening.

Abstract: Collet chucks (20) comprise at least two tensioning segments (21). Adjacent tensioning segments are connected to each other by way of elastic spacer elements (30). The tensioning segments (21) have back-cuts (22), whilst the spacer elements have correspondingly formed sections (36). A positive fit of the formed sections in the back-cuts of the tensioning segments (21) is thus possible.

Abstract: The chuck (10) is comprised of a chuck body (11) having an inner cone surface and a grip head (12) with a corresponding outer cone surface. The grip head (12) is subdivided into individual clamping jaws (21) by several seperating slots, said clamping jaws being connected to the grip head (12) by means of elastic connecting elements (22). Recesses (25) are provided on the inner cone surface of the chuck body (11) at least in the peripheral area of each seperating slot of the grip head (12), preferably also in the peripheral area of the apex line of each clamping jaw (21). Said recesses (25) have peripheral extension which is greater than that of the separating slots of the grip head (12) or the apex region of the clamping jaws (21). The axial extension of the recesses (25) is at least identical to the largest overlap area of both cone surfaces. The recesses (25) are filled with a filling body (27), made of an elastic, compressible material, up to the imaginary inner cone surface.

Abstract: The present invention provides a collet capable of efficiently supplying a cooling fluid such as a cutting fluid to a tool and thereby realizing satisfactory cooling by adjusting the flow velocity of the cooling fluid according to the diameter of the tool held by the collet. The collet comprises: a collet body for inserting the shank of the tool, a slot formed at least from the tool insertion side, and a weir member inserted into the slot. The weir member extends from a position recessed from the inner surface of the collet body in a direction closer to the outer surface of the collet body and reaches the outer surface thereof, and a gap S through which the fluid can flow is formed between the weir member and the inner surface of the collet body.

Abstract: A miniature drill chuck has a drill chuck housing and a thrust member positioned in the interior for moving clamping jaws into their clamping position during a threading movement of the drill chuck housing onto a machine spindle. The thrust member is longitudinally moveable in a guide bore of the drill chuck housing while being centered circumferentially about its entire stroke. A pair of truncated cone surfaces is provided between the machine spindle and the thrust member, wherein the machine spindle centers the thrust member via the pair of truncated cone surfaces when loading the thrust member.

Abstract: A true length collet chuck assembly is adapted to receive and actuate a quick change, segmented collet having a flange extending radially outwardly from the outer surface of the collet adjacent a rear face of the collet. The collet chuck assembly comprises a chuck body having a longitudinally extending bore defined by an inwardly facing, cylindrical surface on the chuck body. The inwardly facing, cylindrical surface on the chuck body defines a circumferential groove for receiving the radially outwardly extending flange on the collet to thereby restrain the collet against axial movement relative to the chuck body. A collet closing sleeve, disposed within the chuck body and axially displaceable relative thereto, has an outwardly flaring interior surface adapted to engage an outwardly flaring surface on the collet.

Abstract: A tool receiver or chuck is provided which may receive a cutting tool, such as a router bit or the like, therewithin and non-rotatably retain the tool relative to a rotary driving device. The tool receiver includes a plurality of blades substantially encased within a conical surface. A biasing member biases the blades toward a narrow end of the conical surface such that the blades are biased in a tool engaging or operative position. The biasing member and conical surface thus bias the blades radially inward toward the cutting tool such that the blades engage the conical surface and the cutting tool. The tool receiver preferably includes a retaining member, which retains the blades within the conical surface and biases the blades radially outwardly toward the conical surface.

Abstract: A clamping jaw for a tool holder chuck, wherein the clamping chuck has two clamping jaws arranged spaced apart and diametrically opposite one another relative to an axis of rotation of the clamping chuck and moveable toward and away from one another for clamping a tool shaft by moving the clamping chuck with a radial component, has a longitudinal slot having a slot mouth open toward the axis of rotation and a slot bottom. The longitudinal slot receives positive-lockingly the tool shaft and has slot flanks defining an approach angle at the slot mouth and a slot bottom angle at the slot bottom. The approach angle is greater than the slot bottom angle. The clamping jaw is manufactured with a disc milling cutter with opposed milling cutter flanks located radially outwardly and positioned slantedly relative to one another at different flank angles. The flank angles increase toward a center of the cutter body.