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US 5,170,851 AGranted
Electric tool
AssigneeKress-Elektrik GmbH & Co.
InventorsWilly Kress, Alfred Binder
Life of this patent
Estimating the term…
Abstract
For the purposes of assembling an electric tool, and especially an electric hand tool such as, for example, a hand drill, a grinder or a sabre saw, it is proposed to use modular components that are to be axially inserted into and connected with each other. The components comprise a self-contained electric driving motor that supports the rotor shaft in a centered position by means of end shields on both sides that are rigidly fixed to the stator, a self-contained gearing head that is fixed to the motor, and at least a partially tubular, single piece main housing that accommodates the driving motor and the gearing head, an electric circuitry module inserted into the main housing, and a rear cover for the housing.
Claims15
An electric tool, comprising the following modular components:
- a self-contained electric driving motor including a stator, rotor shaft, and end shields connected to respective ends of said stator and rotatably supporting ends of said rotor shaft therein for rotation about a longitudinal axis;
- a self-contained gearing head fixedly attached to one of said end shields of the electric driving motor, said gearing head having a tool holding fixture and means for connecting said tool holding fixture to one end of said rotor shaft;
- fastening means for attaching said self-contained motor to said self-contained gearing head, said gearing head and said attached electric motor comprising a first modular subassembly;
- an at least partly tubular main housing having an open end and an opposite end for axially receiving said driving motor in said open end, said housing extending to said gearing head and enclosing said driving motor of said first modular subassembly, said housing having a circuitry module seat at said opposite end;
- an electric circuity module received in said seat on the opposite end of the main housing opposite to the gearing head;
- connecting means between said motor and said electric circuitry module for establishing an electrical plug-in connection therebetween;
- and
- a rear cover for enclosing said circuitry module in said seat and said opposite end of said housing;
- and means for positioning said cover in fixed relationship to said housing and driving motor.
6 more elements
An electric tool comprising the following modular components:
- a self-contained electric driving motor including a stator, rotor shaft, and end shields connected to respective ends of said stator and rotatably supporting ends of said rotor shaft therein for rotation about a longitudinal axis;
- a self-contained gearing head fixedly attached to one of said end shields of the electric driving motor, said gearing head having a tool holding fixture and means for connecting said tool holding fixture to one end of said rotor shaft;
- fastening means for attaching said self-contained motor to said self-contained gearing head, said gearing head and said attached electric motor comprising a first modular subassembly;
- an at least partly tubular main housing having an open end and an opposite end for axially receiving said driving motor in said open end, said housing extending to said gearing head and enclosing said driving motor of said first modular subassembly, said housing having a circuitry module seat at said opposite end and a recess receiving one of said motor end shields opposite from said gear head therein to support said motor said recess being defined by an elastomeric material;
- an electric circuitry module received in said seat on the opposite end of the main housing opposite to the gearing head;
- connecting means between said motor and said electric circuitry module for establishing an electrical plug-in connection therebetween;
- and
- a rear cover for enclosing said circuitry module in said seat and said opposite end of said housing.
5 more elements
An electric tool comprising the following modular components:
- a self-contained electric driving motor including a stator, rotor shaft, and end shields connected to respective ends of said stator and rotatably supporting ends of said rotor shaft therein for rotation about a longitudinal axis;
- a self-contained gearing head fixedly attached to one of said end shields of the electric driving motor, said gearing head having a tool holding fixture and means for connecting said tool holding fixture to one end of said rotor shaft;
- fastening means for attaching said self-contained motor to said self-contained gearing head, said gearing head and said attached electric motor comprising a first modular subassembly;
- an at least partly tubular main housing having an open end and an opposite end for axially receiving said driving motor in said open end, said housing extending to said gearing head and enclosing said driving motor of said first modular subassembly, said housing having a circuitry module seat at said opposite end;
- an electric circuitry module received in said seat on the opposite end of the main housing opposite to the gearing head;
- connecting means between said motor and said electric circuitry module for establishing an electrical plug-in connection therebetween;
- and
- a rear cover for enclosing said circuitry module in said seat and said opposite end of said housing,
- wherein the electric circuitry module is provided with a movable control, said cover having an opening through which said movable control projects, said movable control being connected to said circuitry module to effect speed variations in said electric tool.
6 more elements
An electric tool comprising the following modular components:
- a self-contained electric driving motor including a stator, rotor shaft, and end shields connected to respective ends of said stator and rotatably supporting ends of said rotor shaft therein for rotation about a longitudinal axis;
- a self-contained gearing head fixedly attached to one of said end shields of the electric driving motor, said gearing head having a tool holding fixture and means for connecting said tool holding fixture to one end of said rotor shaft;
- fastening means for attaching said self-contained motor to said self-contained gearing head, said gearing head and said attached electric motor comprising a first modular subassembly;
- an at least partly tubular main housing having an open end and an opposite end for axially receiving said driving motor in said open end and, said housing extending to said gearing head and enclosing said driving motor of said first modular subassembly, said housing having a circuitry module seat at said opposite end;
- an electric circuitry module received in said seat on the opposite end of the main housing opposite to the gearing head;
- connecting means between said motor and said electric circuitry module for establishing an electrical plug-in connection therebetween;
- and
- a rear cover for enclosing said circuitry module in said seat and said opposite end of said housing,
- said circuitry module seat comprising a forked internal extension of the main housing having opposing legs defining a recess which receives said electric circuitry module therebetween, at least one of said legs terminating adjacent said rear cover, and at least a screw extending through said cover into said one leg to connect said cover to said housing.
6 more elements
Dependencies are inferred from the claim text.