Senco Products, Inc.

Francis J Kramer

Robert G Rothfuss

Thomas E Warman

Donald J Massari, Jr

William C Wise

Charles R Martin

Lester D Park

An electronic control system for a pneumatic fastener driving tool of the type having a body containing a cylinder with a piston mounting a driver, a firing valve above and normally closing the upper end of the cylinder, and a space or volume above the firing valve. The volume above the firing valve is normally connected to a source of air under pressure to maintain the firing valve closed. When this volume is connected to exhaust the firing valve opens allowing air under pressure within the cylinder above the piston to cycle the tool. The electronic control system comprises a solenoid actuated valve which, when actuated, connects the volume above the firing valve to exhaust to cycle the tool, a source of electrical current and a control circuit. The control circuit establishes a desired mode of operation for the tool and has inputs from at least a manual trigger and a safety and interprets the inputs including their presence or absence and their sequence. When the inputs satisfy the desired mode of operation, the control circuit will generate an output signal to the valve solenoid and the tool will cycle.

Electronic control for a pneumatic fastener driving tool

A drywall tool provides tactile and audible feedback to the user, as a fastener is driven by frequent multiple blows, to indicate when the fastener is properly driven, and the drywall dimpled, without tearing the paper facing of the drywall. Dimpling apparatus and a firing valve for controlling the multiple blows are described. A cam is provided to withdraw the magazine follower from the last fastener in a strip to avoid jamming or damage by a descending driver. Tool apparatus permits use of lightweight, synthetic parts.

Drywall tool

A pneumatic tool for driving clamp nails, having a single nose piece making possible the driving of clamp nails into the outside corner of a miter joint, or the inside corner of a miter joint, and having a plate which may be adjusted to position the nose piece at any angle from 45.degree. to 30.degree. off the vertical centerline of the tool. When set at the 30.degree. angle, the nose piece is in the optimum position to drive a clamp nail into an inside right angled butt joint. A safety is provided having a configuration like the nose piece. The tool is provided with a magazine for a stick of clamp nails, and an adjustable rail in the magazine makes it adaptable to clamp nails of different sizes. The guide body through which the clamp nails are fed into position below the drive is provided with a configuration which makes it impossible to feed clamp nails if the stick is inserted into the magazine upside down.

Clamp nail driving tool

A clamp nail for joining two wood members tightly together by driving the nail endwise into the two members across the joint. The major length of the nail is in the form of a channel having a web and parallel upstanding flanges along both sides of the web. The web has at least two holes, leaving a central column member. The channel has a tapered transition section which may commence at the leading edge of the nail in the driving direction, or it may join a shorter channel portion at the leading edge, having a wider web and parallel upstanding flanges, to the major channel portion having a narrower web. The web is preferably bowed inwardly to bring the column member more nearly to the center of the flange height. The flange edges preferably are provided with a ledge configuration, the ledges being at a fixed distance from the back of the nail, whereby a plurality of like clamp nails may be stacked in making up a stick of clamp nails capable of use in a nailing machine having a magazine to receive a stick of said nails.

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Edgewood, KY, United States of America

Francis J Kramer