IMPROVEMENTS IN BENCH SAWING MACHINERY
Year: 1876

page_text: LETTERS PATENT to William Blackett Haigh, of Oldham, in the County of
Lancaster, for the Invention of. " IMPROVEMENTS IN BENCH SAWING
MACHINERY."
Sealed the 18th May 1877, and dated the 21st November 1876.
PROVISIONAL SPECIFICATION left by the said William Blackett Haigh at
the Office of the Commissioners of Patents on the 21st November 1876.
WILLIAM BLACKETT HAIGH, of Oldham, in the County of Lancaster.
MENTS IN BENCH SAWING MACHINERY."
"
IMPROVE-
This Invention relates to that class of bench sawing machinery where in one
framework is combined a circular saw as well as a band saw, and has chiefly for
its object to enable the apparatus to be changed from a hand machine to one
driven by power, or vice versa.
Hitherto when a combined machine has been required to be changed from hand
to power, or vice versa, the band saw could only turn in the same direction as the
circular one, which is the wrong way for its cutting, so that only one saw 'could
be used at a time; and, moreover, the speed necessary to drive the circular saw
was too high to drive the band saw, and my object is to overcome these difficulties.
When the machine is to be driven by power the hand wheel is removed, and in
its place and on the same shaft I put a loose wheel of the same diameter, which
acts as a carrier for the band saw. On the same shaft is keyed a small pulley
for working another pulley to give motion to the band saw. A cross strap from the
small pulley on the saw shaft is passed over the pulley of the band saw, which
enables the saws to work in opposite directions, and make both available for use at
one and the same time. By this means of driving I am also enabled to regulate
the relative speeds of the saws as desired.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Blackett Haigh in the Great Seal Patent Office on the 19th
May 1877.
WILLIAM BLACKETT HAIGH, of Oldham, in the County of Lancaster.
MENTS IN BENCH SAWING MACHINERY WORKED BY HAND OR POWER."
"IMPROVE.

page_text: My improvements in bench sawing machines consist in a mode or method of
driving the band saw fixed to the circular saw bench. For this purpose I employ
a crossed strap and pulley on the shaft that drives the circular saw; the. crossed
strap passing round a pulley with a flange in the middle runs loosely on a stud
fixed to a bracket on the saw bench, the band saw passing round a large pulley,
running loose on the driving shaft of the circular saw, then round a pulley which
runs loosely on a stud at one end of the double lever, then round the flanged pulley
to the large loose pulley.
The manner in which my improvements are to be performed will be clearly
understood by reference to the accompanying Sheet of Drawings with the figures
and letters marked thereon, in which Fig. 1 is a side view of a circular saw bench
fitted with my improved band saw attachment; Fig. 2, a plan of the same.
In Figs. 1 and 2, a represents the bench or framework; b, the driving shaft; and
c, the fast and loose pulleys. The band saw d is driven by a pulley e fixed on the
shaft b that drives the circular saw, round which pulley is a crossed strap 9 passing
round a pulley h with a flange in the middle running loose on the stud k fixed on
the bracket on the saw bench. The band saw d passes round the large pulley m
running loose on the driving shaft b, then round the pulley n, which runs loosely
on a stud at one end of the double lever o, and round the flanged pulley to the
large loose pulley m, which runs loose on the driving shaft b; and by this arrange-
ment the ordinary change wheels with their attendant noise at present used are
dispensed with, and less power is required to work the machine.
Having now described the nature and particulars, of my said Invention I desire
it to be understood that I claim, the employment of the cross strap g working on
the fast pulleye and loose pulley h, and the large loose pulley m running loose on
the saw spindle o, as and for the purposes shown and described.
In witness whereof, I, the said William Blackett Haigh, have hereunto set
my hand and seal, this Fourteenth day of May, in the year of our Lord
One thousand eight hundred and seventy-seven.
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