Back to results
US 2008/0189957 A1Published application
Bi-metal chisel blade
AssigneeThe Stanley Works
InventorScott Kasper
Life of this patent
Estimating the term…
Abstract
A chisel with a bi-material blade comprising a main body of low grade steel and a cutting portion of higher grade steel. The cutting portion of higher grade steel provides longer life and decreases the need for frequent sharpening. The main body and cutting portion are connected using an arcuate interface. Additionally, the main body and cutting portion may have a radiussed cross-sectional connection. The arcuate interface and radiussed cross-section help absorb the shear and impact forces applied to the tool.
Claims20
A chisel, comprising:
- a handle;
- an elongated working portion and a shank portion joined with the handle, the elongate working portion having a main body portion and cutting portion;
- the main body portion being formed from a relatively lower grade steel, and the cutting portion being formed from a relatively higher grade steel in comparison with the lower grade steel of the main body portion;
- the cutting portion having a sharpened cutting edge at one end thereof and an arcuate force receiving surface disposed in spaced relation from the cutting edge;
- the main body portion having a driving engagement surface, the driving engagement surface having an arcuate shape that mates with the arcuate configuration of the force receiving surface of the cutting portion.
2 more elements
A chisel, comprising:
- a handle;
- an elongated working portion and a shank portion joined with the handle, the working portion having a main body portion and cutting portion;
- the main body portion being formed from a relatively lower grade steel, the cutting portion being formed from a relatively higher grade steel in comparison with the lower grade steel of the main body portion;
- the cutting portion having a sharpened cutting edge at one end thereof and a force receiving surface disposed in spaced relation from the cutting edge;
- the main body portion having a recess with a driving engagement surface for receiving the force receiving surface of the cutting portion;
- wherein the driving engagement surface of the main body portion has a radiussed cross-sectional configuration that generally slopes rearwardly when mating with the force receiving surface of the cutting portion.
3 more elements
A method of assembling a chisel, comprising:
- forming a main body portion of a lower grade steel with a driving engagement surface of arcuate shape;
- forming a cutting portion of a higher grade steel in comparison with the lower grade steel of the main body portion with an arcuate force receiving surface disposed in a spaced relation to a cutting edge;
- mating the driving engagement surface of the main body portion and force receiving surface of the cutting portion to form a chisel blade;
- and
- connecting the chisel blade with a handle.
2 more elements
Dependencies are inferred from the claim text.