Abstract: A clamp apparatus used for machining a workpiece, such as a structural beam, includes a stationary clamp apparatus and a movable clamp apparatus. The stationary clamp apparatus clamps onto a first side or flange of the workpiece, and the movable clamp apparatus clamps onto another, generally opposite side of the workpiece. The movable clamp apparatus is capable of shifting position in the direction of the stationary clamp means. A pair of fastening mechanisms are positionably secured to the clamp apparatuses, for securing and positioning the workpiece with respect to the clamp apparatuses.

Abstract: Disclosed is a structure for installing a multispindle attachment on a drilling machine or the like. An upper gear coupling member is secured at the lower end of a quill housing a main rotary spindle for a drilling machine, etc. A clamp member is rotatably provided on the gear coupling member. A lower gear coupling member for engaging with the upper gear coupling member is secured on the upper surface of the multispindle attachment installed at the lower end of the quill. Both of these gear coupling members are tightened and secured by means of the clamp member while both of the upper and lower gear coupling members are engaged with each other.

Abstract: A hole machining device capable of effecting marking and similar operations as well as drilling and reaming. The device comprises driving shafts attached to the body of the machining device, spindles for installing the drills, springs for invariably urging the spindles forwardly, spindle collars that cover the springs and detecting means for detecting the backward movement of the collars.

Abstract: An exchange chuck for exchangeably mounting a tool shank adapted for mounting a tool such as drill or tap. The tool shank is inserted to and fastened in a mounting bore formed in a tubular portion of a spindle. A movable sleeve is received on the tubular portion for movement longitudinally thereof, and plural balls are provided to the tubular portion so as to be intruded into or receded from said bore with movement of the movable sleeve, said balls operating to engage with and prevent extraction of the tool shank when intruded into the bore. An ejector member is received in the bottom region of the bore and biased forwardly at all times by a coil spring for extruding the tool shank forwardly at the time of exchange operation of the tool shank.

Abstract: A multi-spindle head attachment in which a positively rotated main spindle gear is meshed with a plurality of intermediate gears which are, in turn, meshed with spindle gears fitted respectively onto spindles each adapted to grip a drill, a tap or the like. Further, one of the spindles can be located in the position where its axis is aligned with the center of axis of the main spindle gear. Disc-like interference preventing members for preventing interference between the intermediate gears and the spindle gears, are provided to the intermediate gears and/or the spindle gears. Each interference preventing member has a diameter slightly larger than that of its corresponding addendum circle of the intermediate gear or spindle gear, and therefore its outer peripheral surface protrudes from the addendum circle of each gear. A slight gap is formed between each interference preventing member and the end face of each gear.

Abstract: A collet chuck assembly used for the attachment of a tap to the spindle of a tapping machine is provided. A bore for insertion of the base end of the tap is formed in the lower portion of a cylindrical portion, and at least one O-ring is mounted on the inner wall of the bore such that it is open to view on the inner peripheral face thereof. With the O-ring, the tap is held in place so as to prevent it from slipping down, and is supported somewhat floatingly within the bore in the diametrical direction. The cylindrical portion is provided therein with a pair of locking faces for locking the prismatic portion of the tap in place so as to inhibit any turning thereof and with a pair of steps or a set screw for controlling the amount of insertion of the tap thereinto.

Abstract: The invention provides a turning type multi-spindle attachment used for mounting a plurality of drills or taps to a drilling or tapping machine. This attachment comprises a mounting cylinder fixed to the spindle quill of the drilling or tapping machine and a body positioned such that a turning position thereof is adjustable relative to the mounting cylinder, whereby a plurality of drills or taps are rotatably supported by the body. The position of the drills or taps is adjustable around the mounting cylinder by causing turning of the body relative to the mounting cylinder.