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| Solid oxide fuel cells |
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| Fuel cell, electrode for the cell and method of preparation thereof |
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Ergonomic utility knife
| Details |
Inventors: Sacherman, James E.; Toor, John W.;
Assignee:
Primary Examiner: Watts; Douglas D.
Assistant Examiner:
Attorney, Agent or Firm: Eakin; James E.
A utility knife having a handle with a shaft portion and a lower protrusion for improved ergonomics is disclosed. The shaft portion has a bore for receiving a collet and the knife includes a central knob for cooperating with the collet to clamp a blade into the collet when the knob is rotated in a first direction and to move the collet axially out from the handle, thereby freeing the blade, when the knob is rotated in the other direction. |
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DETAILED DESCRIPTION OF THE INVENTION Referring first to FIG.
1, the utility knife 10 of the present invention may be seen as a whole.
The blade 12 may be seen to be fitted into a collet 14, which in turn is substantially wholly inserted into a front rounded section 16 of an overall handle 18.
The handle 18 further includes an angled front protrusion 20, a flatted middle protrusion 22, and an angled rear protrusion 24.
The handle further includes a rounded section 26 located above the angled rear protrusion 24.
A rear cap 28, discussed in greated detail in connection with FIG.
3b, is also provided.
The handle 18, including each of its elements 20-26, is preferably formed as an integral whole, and may be formed of any suitable material such ABS, reinforced ABS, nylon, reinforced nylon, reinforced polystyrene, or aluminum, or other materials.
Any suitable process may be used, such as injection molding, casting, or other processes.
Located between the front section 16 and the rear section 26 of the handle 18 is a rotatable central knob 30.
As will be better appreciated from FIGS.
3a-b, also shown in FIG.
1 is a snap ring 32 at the forward junction between the central knob 30 and the rounded section 16 of the handle 18.
The snap ring maintains a close axial tolerance at the knob-handle interface, thereby materially improving the stiffness of the knife 10 as a whole.
This also permits a change in material between the knob 30 and the handle 18, if desired, reducing the possibility of galling and seizing commonly found in compressive junctions between like plastics.
In the embodiment described here, the central knob 30 may be formed of ABS or, if desired, lubricated ABS.
A removable cap 34, shown in phantom in FIG.
1 but shown installed in FIG.
5, may also be provided for use during storage or transport of the blade.
Because the cap may be made of plastic, and is retained in place by a snap fit onto the preferably plastic handle 18, a secure connection may be obtained even with the use of inexpensive materials
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