Improvements in Tools and Tool Holders for Wood Turning Machinery.
Year: 1898

page_text: Date of Application, 11th Oct., 1898-Accepted, 28th Jan., 1899
COMPLETE SPECIFICATION.
Improvements in Tools and Tool Holders for Wood Turning
Machinery.
I, SAMUEL MCKNIGHT, of 7, Printwork Terrace, Belfast, Bobbin Turner, do
hereby declare the nature of this invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:
This invention relates to tools and tool holders for wood turning machinery
and it has for its object to provide an improved construction of tool and (or) tool
holder for such machines as have their tools set in tool boxes which work upon the
sliding bed of the machine.
And in order that my said invention may be properly understood I have hereunto
appended an explanatory sheet of drawings, whereon,
Fig. 1 shows in side view, one mode of carrying out the invention, whilst Fig. 2
shows, also in side view, another mode of carrying out the invention.
Referring to the drawings whereon the same reference leters wherever repeated
indicate the same or similar parts.
In the arrangement shown at Fig. 1, a is the tool holder which is fitted in any
suitable and well known manner to the sliding bed of the machine, whilst is the
cutting tool. As will be seen the tool holder is bent or curved backwards so as to
properly present the tool to the work. The tool is provided with a cover plate or
cover e which can be shifted, in the tool holder, relatively with the tool so as to
regulate the thickness of the shaving or rather scraping to be taken off the
material being cut. In Fig. 1 the material to be cut is indicated by the dotted
lines at e.
The tool and the cover plate e, are, when they are adjusted to their proper
positions within the jaw f of the holder, clamped in place by the pinching screw d.
In the arrangement shown at Fig. 2 the cover c of Fig. 1 is dispensed with and
the holder a itself is made to serve as a cover for the tool. In this case the holder
is, preferably, made rectangular in shape and with the lower face f¹ of the slanting
jaw projecting forwards. This projecting part fl of the face forms, as will
be seen, a cover or guard for the tool which latter is only allowed to project beyond
it the necessary distance to give the desired thickness of shaving. By shifting the
tool up or down within its jaw thicker or thinner shavings, as desired, can be
turned off the material.
The action of the tool is that of a scraping tool and the cover iron exposes only
the scraping edge so that no matter what pressure is applied to the tool holder
in order to cause it to travel in the direction of the arrow the thickness of the cut
cannot exceed the exposed edge of the scraper b, as the cover will come in contact
with the work and act as a stopper. The cover whilst exposing an easily renewed
and sharpable scraping edge prevents the pressure upon the tool holder giving the
edge of the tool such a catch upon the work as will raise the grain and chip the
wood.
The tools, covers and holders may be ground or shaped so as to mould or cut
the rotating material into any desired form or shape.

page_text: The invention is specially applicable to machinery for making bobbins, spools,
and the like.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I consider novel and desire to claim is:
1. In wood turning machinery, the combination with the cutting or scraping tool
of a cover relatively adjustable therewith, substantially as and for the advantages
herein before set forth.
2. In wood turning machinery, the combination with the cutting or scraping
tool of a holder so made as to serve as a cover or guard for the tool, substantially
as hereinbefore set forth.
1808
Dated this 10th dor of October 16