Improvements in Machines for Grinding Scythes, Knives, and "the like.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Machines for Grinding Scythes, Knives, and
"the like.
I, WILLIAM DERRY, of 23, Egerton Crescent, Parsonage Road, Withington, in
the County of Lancaster, Chemical Engineer, do hereby declare the nature of this
invention to be as follows;-
This invention relates to improvements in machines for grinding scythes,
knives and the like and has for its object to provide means whereby such machines
are rendered entirely automatic in action, the operation of grinding is greatly
accelerated and the grinder not liable to receive injury.
To this end I employ upon a suitable bed, a table which is adapted to be
longitudinally reciprocated and at the same time oscillated upon the said bed.
This table serves to hold the work to be ground which is suitably secured
thereto and above the same is mounted in suitable bearings a shaft carrying the
grinding wheel or disc adapted to rotate in the opposite direction to that in which
the said table moves.
The said table and grinding wheel or disc receive motion through suitable gear-
ing from two pulleys and a strap which latter at the end of each travel of and
through the said table and suitable connections interposed, is brought from one
pulley onto the other which causes the travel of the said table and the rotation
of the grinding wheel or disc to be simultaneously reversed.
To facilitate the grinding of scythes or the like having a curved cutting edge,
I form the edge of the said table over which the grinding wheel or disc is
mounted in shape corresponding with that of the scythe or the like to be ground,
which latter is secured with its cutting edge parallel to the said table edge.
By means of a spring or weight the said table edge is kept in contact with a
stationary stud so that as the table moves forwards or backwards it is caused to
swivel on its fulcrum 'and move along the said stud and thus run the edge of
the scythe or the like to be ground gradually underneath the grinding wheel or
lisc.
i
To facilitate the grinding of tools or instruments with a straight cutting
edge the oscillary motion of the said table is dispensed with or rendered inopera-
ive so that the table will only reciprocate in a straight line.
Dated thie 24th day of Cantanhas 1000
F: BOSSHARDT & Co..
Agents to Applicant.
944

page_text: ما
Improvements in Machines for Grinding Scythes, Knives, and
the like.
I, WILLIAM DERRY, late of 23, Egerton Crescent, Parsonage Road, now of 5,
Parkgate Avenue, Withington, in the County of Lancaster, Chemical Engineer,
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 follow-
ing statement:-
This invention relates to improvements in machines for grinding scythes,
knives and the like and has for its object to provide means whereby such machines
are rendered entirely automatic in action, the operation of grinding is greatly
accelerated and the grinder not liable to receive injury.
And in order that my invention may be more fully understood I have caused
to be appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in the various figures, Fig. 1 being an end view, Fig. 2 a
side view and Fig. 3 a plan of a grinding machine constructed in accordance with
one form of my invention.
In carrying out my invention I employ upon a suitable bed a, a table made
in two parts b, b₁ which is adapted to longitudinally reciprocate and at the same
time slowly oscillate on a fulcrum by which the two table parts are connected
together.
The upper part b of this table serves to hold the work c to be ground suitably
secured thereto and above the same is mounted in suitable bearings d a shaft e
carrying the grinding wheel or disc f adapted to rotate in the opposite direction
to that in which the table b moves.
The table b, b' and grinding wheel or disc f may receive motion through suit-
able gearing, from two pulleys and a strap which latter at the end of each travel
of and through the said table and suitable connections interposed, is brought from
one pulley onto the other, which causes the travel of the table b, b₁ and the
rotation of the grinding wheel or disc f to be simultaneously reversed similar as
in a planeing machine.
To facilitate the grinding of scythes or the like having a curved cutting edge,
I form the edge g of the table in shape corresponding with that of the scythe
or the like to be ground, which latter is secured with its cutting edge parallel
to the table edge b.
By means of a spring (or weight) the table edge g is always kept in contact
with a stationary stud i so that as the table noves forwards or back-
wards it swivels on its fulcrum 62, see dotted lines Fig. 3, and passes the
edge of the scythe or the like to be ground gradually underneath the grinding
wheel or disc f.
To facilitate the grinding of tools or instruments with a straight-cutting
edge, the oscillary motion of the table 6 is dispensed with or rendered inoperative
so that the table b will only reciprocate in a straight line.
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 claim is:
1st. In machines for grinding scythes, knives and the like, the combination of a
work table b, b₁ and rotary grinding wheel or disc f, the said work table being
adapted to reciprocate and oscillate and the grinding wheel or disc f to rotate in
reverse direction, all substantially as set forth.

page_text: b
2nd. The table part 6 specified in the preceding claim, fulcrumed to the table
part band formed with a guide edge g corresponding in shape with that of
the work to be ground, in combination with a stationary stud i the said edge
being adapted to move in contact with the said stud so as to serve as a former for
the work to be ground, all substantially as set forth.
1 1
1
T
1900
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester,
Agents to Applicant.