Abstract: An apparatus for indicating a drilling thrust of a hand-operated drill includes a thrust-indicator assembly for attaching between a drill motor and a drill chuck of the hand-operated drill to indicate the drilling thrust. A method of indicating a drilling thrust asserted on a hand-operated drill includes: attaching a thrust-indicator assembly between a drill motor and a drill chuck of a hand-operated drill; and indicating, with the thrust-indicator assembly, a drilling thrust asserted on the drill chuck.

Abstract: There is provided an injection molding machine provided with an injection mechanism that enables a high-speed injection.

Abstract: A tapper mechanism having (i) a rotatable tapper body with a clutch, (ii) a driven shaft having a portion rotatably held coaxially in the tapper body for limited axial motion therein, (iii) an engageable claw connected from the driven shaft for selective engagement with the driven shaft for selectively transmitting torque from the tapper body to the driven shaft upon the axial movement of the driven shaft within the tapper body the transmission of torque from the tapper body to the driven shaft is interrupted by the disengagement of the clutch and the driven shaft is axially moved into a neutral state, (iv) a tap connected from an end of the driven shaft that is remote from the tapper body, (v) an engaging slider disposed between the driven shaft and the engageable claw, the engageable claw and the driven shaft being adapted to rotate together and are axially displaceable relative to each other within the tapper body during such rotation, and (vi) a clutch spring urging the engageable claw away from the clutc

Abstract: An internal thread forming apparatus includes a housing body fixed on a machine tool, a driving spindle connected to the rotatable main shaft of the machine tool and rotatable at the same speed as that of the main shaft, a movable body movable vertically within the housing body, a rotary lever actuatable to move the movable body downward, and a first return spring biasing the rotary lever to return to a static position. A positive-revolution driving body and a reverse-revolution driving body are carried on and are movable synchronously with the movable body, and rotate in opposite directions. A speed reduction gearing interconnects the driving spindle and the face gears so as to rotate the face gears at a speed less than that of the driving spindle. An output spindle is mounted slidably within the movable body. A tap is fastened to the output spindle. A driving block is carried on the output spindle.

Abstract: A tapper/threader assembly for use in a lathe is disclosed. The assembly has a piston member mounted for reciprocal movement with a sleeve housing, a shank member is connected to the piston member and an end extending from the housing. A mounting shaft for a chuck extends from the housing and a spring biases the housing toward the piston member.

Abstract: The object of the invention relates to the technical branch of machine-tool accessories.The adapter features a torque limiter comprising a driving means (2) provided with a plurality of radial openings (2d) and axial openings (2e) which communicate between themselves, designed so that each set of openings (2d-2e) houses two balls arranged side by side, of which one (5) contacts the profiled recesses (1b) of a tap holder (1) of correspondent number, and the other one (6), contacts the top element (7) of an adjustable elastic means housed between the tap holder and a casing (3), so as to separate the driving means from the tap holder when the determined torque has been reached.The invention is applicable to all tapping chucks or various machine-tools.

Abstract: Clutching device particularly adapted for use in tapping attachments. The clutch is of the type having axial aligned driving and driven elements. The invention is illustrated in a reversible tapping attachment. In a preferred form the driving element is in the form of a sleeve having axial splines. The driven element has axial grooves. A ball retainer with angularly spaced balls provides for drive between the drive element and the driven element, the balls being engageable with the axial splines and with the axial grooves in the driven element. The improvement resides in that the axial grooves are not of the same width as the diameter of the balls but are of a width greater than the diameter of the balls, the width being preferably twice the diameter of the balls. Improved operation is realized in clutching and declutching and in the transfer through a neutral zone from direct drive to reverse drive. In the preferred embodiment the tapping attachment is of the free-axial float type.

Abstract: A tapping attachment particularly adapted for use with machines under numerical computer control. The attachment embodies tension cushion for the spindle by way of a tension spring as well as compression cushion for the spindle. The compression cushion is provided by way of an adjustable spring member which is in a bore of the spindle and which has a helical spring formed in it. The tension spring is on the inside of the compression spring member. The attachment as a whole is of relatively short overall length, adapting it for use in an automated system wherein attachments are automatically inserted in the machine and interchanged. The attachment embodies a hard start feature provided by way of releasable securement which will release the spindle for movement in response to predetermined axial force, so that in the case of a dull tap the automated movement of the attachment under computer control will be kept accurately programmed.

Abstract: An improved hydraulic stop for use with drilling and countersinking tools. The stop limits the penetration of the tool into the workpiece by dwelling at a pre-set depth while the machine spindle continues to travel (feed) through a hydraulic override system.A safety relief valve, pre-set to a safe load, will permit the device to collapse or override if the hydraulic or mechanical override system should fail.

Abstract: This disclosure relates to a tool holder including a driving cylinder, a driven cylinder reciprocatable and rotatable within the driving cylinder and attachable with a tool, first threaded means reciprocatable and rotatable together with the driven cylinder and having the same pitch as that of said tool, and second threaded means in threading engagement with the first threaded means and rotatable relative to and engageable with part of the driving cylinder to stop axial movement away from a workpiece and adapted to prevent its rotation relative to said first threaded means, such that the rotation of said first threaded means forces the tool to be advanced accurately with the same pitch as that of the tool.

Abstract: This disclosure relates to a tapping spindle including an automatic depth control. The spindle includes coaxial, telescoping driving and driven cylinders, and axial slot-like openings are formed in the cylinders. A slidable roller fits in the openings and normally engages the cylinders. The openings are shaped so that the roller disengages the cylinders upon sufficient relative axial movement thereof, and means is provided to adjust the depth at which the disengagement occurs. A spring is also provided to absorb shock when the tap begins to bite into the workpiece.

Abstract: A driven cylinder is rotatably and reciprocatably mounted within a rotatable driving cylinder open at one end. The driving cylinder has a plurality of axial slots formed in its side wall. A clutch sleeve is secured to the driven cylinder inside the driving cylinder and has a plurality of axial grooves adapted to be aligned with the slots. The transverse top wall of the clutch sleeve is sloped upwardly from the leading edge of one groove to the trailing edge of the next groove. Each groove has an inner end opening towards the closed end of the driving cylinder. A ball is rotatably and reciprocatably mounted in the bottom of each groove and a roller is rotatably and reciprocatably mounted in each groove on top of the ball and extending out of the open end of the groove. The ball and roller in each groove also contact the edges of the aligned slot to transmit rotation from the driving to the driven cylinder.

Abstract: The holder is intended for fixed application to the tail stock of a lathe, or equivalent machine tool, to optionally mount a die or tap for externally or internally threading a workpiece carried on the rotating head-stock end of such machine tool. Thus mounted and adjustably pre-set, the holder automatically decouples operationally from the workpiece after a predetermined axial length of threading has been cut on the work part, thus causing the latter to rotatively overrun the tap or die on the holder.

Abstract: An improved threading attachment for turning machines incorporates a carrier for holding a tool such as a tap, a stationary supporting arbor and a sliding spindle extending between the arbor and carrier in coaxial relationship with the tap. The spindle shifts axially relative to the carrier and arbor and automatically disengages the carrier from the arbor to terminate a thread cutting operation when the tap has advanced through a hole by a predetermined amount or has bottomed in a blind hole.

Abstract: The invention is an improved coupling or clutching means for driving between axially aligned rotating parts and is particularly adaptable in non-reversing tapping attachments. The attachment can, however, be driven in the reverse direction. Clutch drive means are provided for driving in either rotational direction. The clutch drive means is in the form of a sleeve having a ball race carrying driving balls interposed between axial splines on one part and axial grooves on the other part. The splines have an intermediate interruption for de-clutching after relative axial movement of the rotating parts. After further relative axial movement the balls re-engage the splines beyond the interruption, and the attachment is then driven in the reverse direction.

Abstract: A tap chucking means is provided which is adapted to automatically stop rotation of a tap at a predetermined depth and to pull the tap out from the work by reversing the rotation of the spindle. A cylindrical body has a bore in one end in which a socket shaft is slidably and rotatably mounted. The socket shaft is adapted to mount a chuck at its exterior end and is resiliently biased into the body. A clutch pin passes transversely through the socket shaft and has beveled inner faces on both ends of the pin. A pair of drive pins are disposed along opposite sides of the socket shaft for engagement by the clutch pin and are axially slidable in axial grooves formed longitudinally in the mid-portion of the cylindrical body. The drive pins are resiliently biased towards the open end of the body.