It is accordingly an object of the invention to provide a technique of cooling a power tool which further improves cooling effectiveness of the power tool. According to the invention, a power tool is provided that includes a driving motor, a tool bit, a power transmitting mechanism, a tool body and a cooling fan. The power tool further includes first and second cooling air passages. The first cooling air passage is disposed within the tool body and flows cooling air into the tool body by using t...

The bearing of a machine tool spindle is sealed by a pair of wiping seals mounted on the shaft and resiliently urged into contact with opposite faces of a stationary ring through which the shaft extends. The very small clearance between the ring and the shaft is fed with gas for example air at low pressure. When there is no gas supply and for example when the shaft is stationary the seals contact the ring and the resilience ensures good contact and prevents seepage of for example lubricant along...

An electrically powered hand tool is disclosed. The tool includes a motor, a power source, a work element and a controller. Various alternative features, embodiments and operative configurations are disclosed.

A tool for cleaning dry and wet dirt has a handle carrying a Piassava type brush and a rubber scraping element or squeegee. The handle is secured to a flange having a coaxial extension fitting through an oblique hole in the brush head. The extension protrudes on the underside and is fitted with a wedge fastener. The rubber scraping element is carried by a bent plate secured to the topside of the brush head. This plate is apertured and grooved and engages non-rotatably with the flange extension.

This invention is the method and apparatus for locking an indexable replaceable cutting tool insert into a cutting tool holder using a tilting pin type device consisting of a pivotally recessed pin with a resilient member and set screw which lock the insert into an insert pocket of the tool holder.

A machine for forming gears and the like comprises a workpiece support continuously rotatable about a first axis, a tool support angularly displaceable about a second axis and constructed to support a tool for rotation about a third axis angled to the first axis and an electrical master-slave servo system having a master providing a first electrical signal defining a required angular displacement for the tool support and a second electrical signal for influencing the continuous rotation of the w...

A cutting tool comprising a cutting bit, a tool holder having a cutting bit receiving recess and a clamping member for clamping the cutting bit in the recess of the tool holder. The flank surface of the cutting bit remote from its cutting edge has two recesses therein, the bottom surfaces of which extend inwardly of the cutting bit at an acute angle with respect to a lower, seating face of the cutting bit. Two toe dogs are provided on the clamping member and engage in the recesses of the cutting...

A hand tool including a blade or tool part with a connected tang and a handle part with an aperture extending axially from one end for receiving the tang, a locking pin extending diametrically across the handle part and the tang being provided with a slot for the passage of said locking pin to a cross bore in the tang, the locking pin being rotatable or axially movable to engage it with said cross bore.

A tool for lapping internal surfaces of holes. Lapping tools conventionally have an expandable working portion for variable diameter operation. Known tools tend to expand in a barrel shape leading to inaccurate lapping. The invention seeks to avoid this by providing a working portion of a tubular tool with slots in a plurality of rows each having several slots. Slots in each row are staggered relative to those in adjacent rows.

Tools for stamping very delicate lead frames for semiconductor packages, including scored and bent-up tabs that retain groups of inner lead tips in position through subsequent operations, after which they are broken off. Sequential punch and die sets are used to (1) define the tabs, (2) bend down the leads, (3) score the tabs and coin the lead tips, and (4) bend the tabs up. At stations (3) and (4) means are provided to lift scored tabs out of the die and to allow the frame strip to move over th...