Power driven tool and drive system therefor
AssigneeAtlas Copco AB
InventorGunnar C. Hansson
Life of this patent
Estimating the term…
Abstract
A portable screw fastener driving tool is driven electrically from a solid state inverter and intended to be coupled to any selected one in a set of screw fastener engaging members, each demanding a drive enabling tightening of the engaged fastener by parameters (e.g. torque, angle, speed) specific to its size or type. Code elements are provided on the members in a binary code pattern specific for each member. Sensors on the tool read the code pattern on the member connected to the tool and serve it electrically to a decoding unit which transforms the read binary pattern to signals adapted to control the inverter the way the member demands.
Claims10
A power driven tool and drive system for tightening screw fasteners comprising:
- a portable housing;
- a rotary motor in said housing responsive to specific electrical input power having at least one particular drive parameter with a predetermined variation during tightening;
- a static converter means having an output and a control input, said converter means being connected to said motor so as to selectively provide from said output said specific electrical power having said at least one drive parameter;
- a first circuit means connecting said motor to said output of said static converter means;
- an output shaft on said housing in driven connection with said motor thereof;
- at least two screw fastener engaging members selectively connectable to said output shaft into working position on said housing to be driven by said motor and each demanding to receive from said static converter and motor, via code elements its own specific driving parameter and predetermined variation thereof for proper tightening of a screw fastener engaged by said member in its working position;
- a second circuit means connecting said housing to said control input of said converter means, said second circuit having a special identification means on said housing for identifying said members via said code elements:
- and said identification means being connected to electronic means in said second circuit to set said control input on said converter means so that said converter means is adjusted to generate the specific electrical power for said motor demanded by the member connected to said output shaft.
A power driven screw fastener tightening tool comprising:
- a portable housing;
- a rotary motor in said housing responsive to specific electrical input power having at least one particular drive parameter with a predetermined variation during tightening;
- a first circuit means connectable to said motor and to electrical power means of static converter type to selectively provide said motor with said specific electrical power having said at least one drive parameter;
- an output shaft on said tool housing in driven connection with said motor connected to any one of a set of screw fastener engaging members placed selectively into working position on said output shaft to be driven thereby and each demanding, when in such position to receive from said motors, its own specific driving parameter and predetermined variation thereof, via code elements, for proper tightening of a screw fastener engaged by said member;
- a second circuit means connectable to said tool and to said power means, said second circuit means including a special identification means on said tool for identifying said members adjacent to said working position thereof via said code element;
- and electronic means in said second circuit connected to said identification means and to said power means to set said power means to generate the specific electrical power for said motor demanded by the member connected in working position on said output shaft.
Dependencies are inferred from the claim text.