IMPROVEMENTS IN CIRCULAR SAWS
Year: 1880

page_text: LETTERS PATENT to Herbert John Haddan, of the Firm of Herbert and
Company, Solicitors of Patents, of 67, Strand, in the City of Westminster,
Civil Engineer, for an Invention of "IMPROVEMENTS IN CIRCULAR SAWS."
A communication from abroad by Jacob Kitz, of Neu-Schleussig-Leipzig,
in the German Empire.
'
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at
the Office of the Commissioners of Patents on the 30th November 1880.
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors of
Patents, of 67, Strand, in the City of Westminster, Civil Engineer. "IMPROVEMENTS
IN CIRCULAR SAWS." A communication from abroad by Jacob Kitz, of Neu-
Schleussig-Leipzig, in the German Empire.
This Invention relates to the mode of mounting the blades of circular saws or
their shafts, and has for its object to cut grooves of variable width with the same
blade.
The saw blade is fastened between two annular discs or rings, which turn on
two pivots placed perpendicularly to the shaft of the saw and attached to the
circumference of the nave which is rigidly mounted on the shaft of the saw.
Thus the blade is not compelled to revolve in one plane, but can be placed
oblique to the shaft by means of a screw, threaded into the nave near the
circumference of the same and resting with its head against the face of the flange
of the saw (the said annular discs) which revolve with the blade.
The two pivots may be adjusted in their bearings by set screws screwed into the
flange and pressing upon plates or bushes which form adjustable bearings for the
pivots.

page_text: :
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Herbert John Haddan in the Great Seal Patent Office on the
17th May 1881..
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors of
Patents, of 67, Strand, in the City of Westminster; Civil Engineer. "IMPROVEMENTS
IN CIRCULAR. SAWS." A communication from abroad by Jacob Kitz, of Neu-
Schlewssig-Leipzig, in the German Empire.
This Invention relates to the mode of mounting the blades of circular saws.on
their shafts, and has for its object to cut grooves of variable width with the same
blade. The saw blade is fastened between two annular discs or rings which turn
on two pivots placed perpendicularly to the shaft of the saw and attached to the
circumference of the nave which is rigidly mounted on the shaft of the saw.
Thus the blade is not compelled to revolve in one plane but can be placed oblique
to the shaft by means of a screw, threaded into the nave near the circumference of
the same and resting with its head against the face of the flange of the saw (the
said annular discs) which revolve with the blade. The two pivots may be adjusted
in their bearings by set screws, screwed into the flange and pressing upon plates or
bushes which form adjustable bearings for the pivots.
The accompanying Drawing will serve more fully to illustrate the mode of
performing the Invention. Fig. 1 is a side elevation; Fig. 2 a section without
shaft; Fig. 3 a section of saw at right angles on shaft with saw embedded in a
piece of timber; Fig. 4 a section of saw canted at an angle on shaft; in all the
Figures like letters represent like parts; A. is the saw; B nave fastened on the shaft
and furnished with pivots c; these pivots move the annular disc h, which is
regulated by the screws f, working in the flanges a, a¹; these screws, together with
the screw E, working in B, allow and fix the variation of the plane of the circular
saw so that it may cut broad or narrow grooves. The various parts are made of
metal and to any convenient scale.
In witness whereof, I, the said Herbert John Haddan, have hereunto set my
hand and seal, this Thirteenth day of May, A.D. 1881.