Electric drill completed with a set of grinding equipments

An electric drill completed with a set of grinding equipments, comprising:

• a housing, within which a rotor, a rotating shaft passing through said rotor with one front end extending out of said housing, and a plurality of transmission gears being provided to cause a chuck outside said housing and secured to the head end of said rotating shaft to drive a drill bit held by said chuck to press and drill a piece of work;
• said housing extending backward to form a rear compartment to accommodate therein a set of grinding equipments which mainly includes a grinding wheel, a side cover, a cam, a jig holder, and a drill jig;
• said grinding wheel being pivotly supported by said rotating shaft on a rear end thereof which backward extends into said rear compartment and being capable of turning along with said rotating shaft so as to grind a drill bit;
• said side cover being pivotly connected at a vertical edge thereof to a side opening of said rear compartment such that said side cover closes said rear compartment and can be freely opened outward;
• said side cover further having an horizontal oblong through hole and an arcuate slot formed thereon at proper positions;
• said cam having a through hole formed at an end with larger width such that said through hole corresponds to said horizontal oblong hole on said side cover, and a projected pin provided at the other narrower end of said cam, corresponding to and normal to said arcuate slot on said side cover such that said projected pin may extend into said arcuate slot and slidably moves at a certain angle therein;
• said jig holder being a substantially n-shaped frame, having two opposite side walls each of which being provided with a freely adjustable retaining hole in which a head pin projecting toward a center of said retaining hole is provided, and a back wall connecting said two side walls having an internally threaded sleeve horizontally projecting outward therefrom;
• said sleeve further passing through said through hole on said cam and said oblong hole on said side cover in sequence, permitting said jig holder, said cam, and said side cover to firmly associate with other;
• and
• said drill jig being substantially a tubular member having a central through bore and an adjustable chuck at a front head thereof, and being separately formed near a front and a rear ends thereof two circumferential recesses which, preferably 180 degrees in span, separately engages with said retaining holes of said jig holder;
• said set of grinding equipments being concealed within said rear compartment of said housing of said electric drill when it is not in use;
• said side cover thereof being opened outward first when said set of grinding equipments is used to grind a drill bit, then said drill bit to be ground being inserted into said chuck of said drill jig before said electric drill is powered to turn said rotating shaft so that said rotating shaft drives said grinding wheel to turn and grind said drill bit.