A multi-blade type woodworking bit includes a driving section for coupling with an external tool and a working section in front of the driving section. The working section includes a first cutting section and a second cutting section behind the first cutting section. The first cutting section is conic and has a front pointed end. The first cutting section further includes at least two angularly spaced first dust discharge grooves. The second cutting section includes a shank portion axially connected to a rear end of the first cutting section. At least two angularly spaced blades extend radially from the shank portion. Each blade includes a front cutting end. A rear end of each first dust discharge groove is located between a pair of blades. A second dust discharge groove is formed between each pair of blades and has a width lager than a width of each first dust discharge groove.

A multi-blade type woodworking bit includes a driving section for coupling with an external tool and a working section in front of the driving section. The working section includes a first cutting section and a second cutting section behind the first cutting section. The first cutting section is conic and has a front pointed end. The first cutting section further includes at least two angularly spaced first dust discharge grooves. The second cutting section includes a shank portion axially connected to a rear end of the first cutting section. At least two angularly spaced blades extend radially from the shank portion. Each blade includes a front cutting end. A rear end of each first dust discharge groove is located between a pair of blades. A second dust discharge groove is formed between each pair of blades and has a width lager than a width of each first dust discharge groove.

An auger includes a body having a first end and a second end opposite the first end and a shank positioned at the first end of the body. The shank is configured to couple to a power tool. The auger also includes a cutting head positioned at the second end of the body. The cutting head is substantially cone shaped. The cutting head includes a feed screw and a cutting flute.

A spade drill bit includes a shank extending along an axis from a rear end to a front end, the rear end configured to be coupled to a tool holder of a power tool, a blade including a paddle extending along the axis with a front portion and rear portion coupled to the front end of the shank, and a tip coupled to the front portion of the paddle. First and second primary cutting edges are disposed on a front edge of the front portion of the paddle and extend radially outward from the tip. At least the rear portion of the paddle is composed of a first steel alloy. The primary cutting edges are composed of a second steel alloy that has a greater hardness than the first steel alloy.

A quick change woodworking spade bit includes a bit having a cutting portion and an insertion portion with a positioning hole. A shank is coupled with a rear end of a connecting seat. The insertion portion of the bit is detachably engaged in an insertion hole in a front end of the connecting seat. First and second recessed portions are defined in a peripheral wall of the connecting seat. The second recessed portion includes first and through-holes intercommunicated with the first recessed portion and the insertion hole, respectively. An actuating rod is mounted in the second recessed portion and includes an engagement column extending through the first through-hole and a positioning column extending through the second through-hole. A button is mounted in the first recessed portion and is operably connected to the engagement column. The positioning column is biased by an elastic element to engage with the positioning hole.

A quick change woodworking spade bit includes a bit having a cutting portion and an insertion portion with a positioning hole. A shank is coupled with a rear end of a connecting seat. The insertion portion of the bit is detachably engaged in an insertion hole in a front end of the connecting seat. First and second recessed portions are defined in a peripheral wall of the connecting seat. The second recessed portion includes first and through-holes intercommunicated with the first recessed portion and the insertion hole, respectively. An actuating rod is mounted in the second recessed portion and includes an engagement column extending through the first through-hole and a positioning column extending through the second through-hole. A button is mounted in the first recessed portion and is operably connected to the engagement column. The positioning column is biased by an elastic element to engage with the positioning hole.

A method for producing woodworking spade bits includes producing shanks from cylindrical rods. Each shank includes a front connecting portion including a front welding face extending between two front inclined sides and having a first width. Bits are produced from a flat board. Each bit includes a front end having a drilling portion with a second width larger than the first width. Each bit further includes a rear end having a rear connecting portion. The rear connecting portion includes two rear inclined sides extending rearwards towards a longitudinal axis. The rear connecting portion further includes a rear welding face extending between the rear inclined sides and having a width equal to the first width. The front welding face of each shank and the rear welding face of each bit are welded together, forming semi-products of woodworking spade bits which are heat processed, surface treated, and grinded to obtain final products.

A method for producing woodworking spade bits includes producing shanks from cylindrical rods. Each shank includes a front connecting portion including a front welding face extending between two front inclined sides and having a first width. Bits are produced from a flat board. Each bit includes a front end having a drilling portion with a second width larger than the first width. Each bit further includes a rear end having a rear connecting portion. The rear connecting portion includes two rear inclined sides extending rearwards towards a longitudinal axis. The rear connecting portion further includes a rear welding face extending between the rear inclined sides and having a width equal to the first width. The front welding face of each shank and the rear welding face of each bit are welded together, forming semi-products of woodworking spade bits which are heat processed, surface treated, and grinded to obtain final products.

A spade bit includes a shaft defining an axis about which the spade bit is configured to be rotated. The space bit also includes a blade attached to the shaft and having a first paddle portion and a second paddle portion. In addition, the spade bit includes a tip portion attached to the blade and aligned with the axis. The first paddle portion includes (i) a first leading end portion positioned on a first side of the axis and configured to define a first cutting edge portion, and (ii) a first lateral extension portion configured to define a first sloping surface. The first paddle portion defines a first relief space positioned adjacent to both the first sloping portion and the first leading end portion. The second paddle portion includes (i) a second leading end portion positioned on an opposite second side of the axis and configured to define a second cutting edge portion, and (ii) a second lateral extension portion configured to define a second sloping surface. The second paddle portion defines a second relief space positioned adjacent to both the second sloping portion and the second leading end portion.

A spade bit includes a shaft defining an axis about which the spade bit is configured to be rotated. The space bit also includes a blade attached to the shaft and having a first paddle portion and a second paddle portion. In addition, the spade bit includes a tip portion attached to the blade and aligned with the axis. The first paddle portion includes (i) a first leading end portion positioned on a first side of the axis and configured to define a first cutting edge portion, and (ii) a first lateral extension portion configured to define a first sloping surface. The first paddle portion defines a first relief space positioned adjacent to both the first sloping portion and the first leading end portion. The second paddle portion includes (i) a second leading end portion positioned on an opposite second side of the axis and configured to define a second cutting edge portion, and (ii) a second lateral extension portion configured to define a second sloping surface. The second paddle portion defines a second relief space positioned adjacent to both the second sloping portion and the second leading end portion.