IMPROVEMENTS. IN MACHINERY FOR SAWING WOOD.
Year: 1874

page_text: LETTERS PATENT to John Robinson, of Rochdale, in the County of
Lancaster, Mechanical Engineer, and John Smith, of the same
Place, Mechanical Engineer, for the Invention of "IMPROVEMENTS.
IN MACHINERY FOR SAWING WOOD.".
PROVISIONAL SPECIFICATION left by the said John Robinson and
John Smith at the Office of the Commissioners of Patents, with
their Petition, on the 12th November 1874.
We, JOHN ROBINSON, of Rochdale, in the County of Lancaster;
Mechanical Engineer, and JOHN SMITH, of the same Place, Mechanical'
Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN MACHINERY FOR SAWING WOOD," to be as follows:-
Our Invention relates to those machines in which a horizontally cutting.
reciprocating saw is employed. In these machines the saw is carried by:
blocks which travel between fixed guides, and as the cutting direction of
the said saw is arranged so as to alter its angle there is a great strain
and consequent wear of the working parts, and it is to obviate or lessen

page_text: this that our Invention is designed. With this view we form the afore-
said blocks in three parts, the central portion being that through which
the motive power is communicated, and the others being those which
move in contact with the guides, and these we make capable of swivelling
so that they may accommodate their positions to the angular directions
required for the saw.
- SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Robinson and John Smith in the Great Scal
Patent Office on the 12th May 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
ROBINSON, of Rochdale, in the County of Lancaster, Mechanical
Engineer, and JOHN SMITH, of the same Place, Mechanical Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of November, in the year
of our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said John Robinson and John Smith, Her
special license that we, the said John Robinson and John Smith,
our executors, administrators, and assigns, or such others as we, the
said John Robinson and John Smith, our executors, administrators, and
assigns, should at any time agree with, and no others, from time to time
and at all times thercafter during the term therein expressod, should
and lawfully might make, use, exeroise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle
of Man, an Invention for "IMPROVEMENTS IN MACHINERY FOR SAWING WOOD,"
upon the condition, amongst others, that we, the said John Robinson
and John Smith, by an instrument in writing under our hands and
seals (or under the hand and seal of one of us), should particularly
describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters. Patent.
12, that 1, the said John Smith, do hereby declare the

page_text: nature of our said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement, and accompanying Drawing (that is to say) :—
- Our Invention relates to those machines in which a horizontally cutting
reciprocating saw is employed. In these machines the saw is carried by
blocks which reciprocate between guides, and as the cutting direction of
the said saw is arranged so as to alter its angle there is a great strain
and constant wear of the working parts, and it is to obviate or lessen
this that our Invention is designed. With this view we form the afore-
said blocks in three parts, the central portion of one of them being that
through which the motive power is communicated, and the others being
those which move in contact with the guides; and these we make capable
of swivelling so that they may accommodate their positions. to the
angular directions required for the same.
In the accompanying Drawing Fig. 1 represents in front view the
whole of the apparatus so far as our Invention is concerned; Fig. 2 is a
top view of that part which carries the blocks; Fig. 3 is an end view of
Fig. 1; and Figs. 4 and 5, detached views of the blocks.
At a is the usual frame formed with the guides b, bx, in which are
situate the blocks c, c*, and to these blocks are fixed the arms d, d*, which
carry the saw e, and at f is the tension rod, the whole of the parts now
mentioned being the same as those in common use, and they may
be mounted so as to be adjustable bodily upward and downward, as is
now practised.
Referring to Fig. 2, the dotted lines g, h, represent the deviation through
which the blocks have to move in their guides, and it is to neutralize
the twisting action which this motion causes that we have in view by
our Invention, and the manner in which we accomplish it will be seen
by reference to Figs. 4 and 5.
Referring first of all to Fig, 4, at c is the block, and at i, i*, are the
parts which move in the guides, and these parts according to the usual
method are made in one piece with the block, but according to our Inven-
tion we make them in separate parts from the blocks and provide them
with circular pins k, k*, situate in recesses formed in the block, during
therefore the above-named twisting action the parts i, i*, can swivel upon
the block, although the said block may be moved in a direct line by

page_text: the motive power. The other block o* is in like manner provided with
loose swivelling parts 1, 1*. One of the blocks is wider than the other
for the well-known purpose of gaining more stability for that part
which directly receives the motive power.
Having thus described and ascertained the nature of my said Inven- 5
tion, and the manner in-which the same is to be performed, I desire it
to be understood, that we claim as secured to us under the above in part
recited Letters Patent and for the purposes aforesaid, the use of blocks
provided with swivelling parts which run in contact with the guides.
;
In witness whereof, I, the said John Smith, have hereunto set 1
my hand and seal, this Eleventh day of May, in the year of our
Lord One thousand eight hundred and seventy-five.