Improvements in Machines for Grinding and Polishing Stones, and in other Machines having a Rack in which Traverses a Rotary Tool Shaft.
Year: 1894

page_text: Date of Application, 23rd Jan., 1894
Complete Specification Left. 13th Oct., 1894-Accepted, 29th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in Machines for Grinding and Polishing Stones, and
in other Machines having a Rack in which Traverses a Rotary
Tool Shaft.
We, NILS PETTER ÖSTBERG, Master Stone-mason, and MAGNUS AF KLINTEBERG,
Engineer, both in Lund, Sweden, do hereby declare the nature of this invention to
be as follows:-
O
This invention relates to improvements in machines for grinding and polishing
stones and in other machines having a rack in which traverses a rotary tool shaft,
and has for its object to provide devices whereby the vertical shaft, which carries
the tool, is regularly rotated in one direction as well as reciprocated laterally and
the reversing effected instantaneously.
And in order that our invention may be more fully understood we have caused to
be appended hereunto three sheets of drawings marked with letters of reference
indicating like parts in the various figures.
Fig. 1 is a side view, Fig. 2 an end view and Fig. 3 a vertical section of our
improved machine for grinding and polishing stones. Figs. 4, 5, 6 & 7 are views of
details thereof.
The vertical shaft a, which serves for the reception of the tool, is rotated by
means of a pair of bevel wheels b from the driving shaft e having pulleys. The
bevel wheel on the shaft c is rendered longitudinally movable and is obliged to
participate in its rotation through a key employed in the boss of the said wheel,
moving in a key bed in the shaft c. A bracket d which is longitudinally guided
upon the rail e serves as bearings for the two shafts a & c. Below the guide rail e
is a double rack the teeth of which at each end are removed, as shown in Fig. 4.
The ends of the racks are formed with flat pivots g arranged to move in a corre-
sponding bracket employed at each frame end of the machine; these brackets
permit the said rack of moving to and fro. Each of the pivots g is formed with a
sloth inclining in the same direction and receiving respectively a pin i fixed to the
last named bracket which slot and pin cause the said racks to move at an incline
when actuated longitudinally. The rack fis in gear with a pinion ; secured upon
the vertical shaft a and double the width of the rack f, one half projecting above
the latter. One of the teeth of this pinion is lengthened downwards. The two
rows of rack teeth are formed at such a distance apart from each other that the
said pinion can move freely between without coming into contact with the same so
as to allow of the shaft a being rotated otherwise when retained in a certain position
by the bracket d. In order to cause the shaft a to move to and fro upon the guide
rail é as required during the grinding and polishing operation the following device
is provided. Upon the rail e is employed near each end a bracket / each of which
carries a small rack m positioned in close proximity of the upper side of the rack f
and in pitch and width equal to the latter. Each of the said racks is formed with
two pivots n received by corresponding holes in the bracket / so as to render the
racks m capable of moving in a horizontal plane, as well as at a right angle to their
longitudinal movement. The racks m are periodically moved to and fro longi-
tudinally by means of the rack fand the projections o employed at suitable places
D

page_text: thereon. Upon the lower side of the rack fare also employed two projections k
which have projecting on their upper side opposite the rack f tooth like parts q in
a height equal to that of the lengthened tooth. part p which projects from the
underside of the pinion j. Below the pinion jis arranged upon the shaft a a circular
disc which may move freely below the upper part of the projection k but
capable of abuting against the lower part thereof, for which purpose the said
disc is shaped as shown in Fig. 7. The movement- takes place in the following
manner :-
Assuming that the projections kat each end of the rack fare in the position as shown
in Fig. 4, that the brackets with the racks m belonging thereto are in the respective
positions and that the rack fis as far as possible to the right a position which may
be varied by the set screws in order to retain the pinion in proper gear with the
rack side y; assuming also that the pinion and the shaft a revolves in the direction
as indicated by the arrow, the shaft a will be obliged to move in the direction
of z owing to the rack f being arrested by the set screw s. The rack m at the
left is so adjusted that its teeth are positioned in a line over the teeth of the
rack so that the last tooth of the rack f corresponds with the first tooth of
the rack m. When the pinion engages the first tooth. of the rack m, the edges of
the disc touches. the projection & and owing to the pinion continuing its rotation
along the rack m, the rack f will be obliged to move in the same direction as the
shaft that is to say towards z, by means of the inclined sloth and pin the rack f
is caused to move parallel with the said slots and when the said pinion has reached
the last tooth of the rack m the lengthened tooth p engages the part 9 of the
projection and guides the rack f completely over, so that the said pinion will
then be in gear with the other side of the rack. On reversing, the teeth of the
pinion have abuted against the broad tooth t on the rack m, whereby the rack m
will be pushed back to such an extent, that the said pinion will not touch it. The
rack whilst passing the rack m has moved so far to the right, that it abuts against
the set screws on that side, pressure thus being exerted against the screws on the
further rotation of the shaft a. The projection o on the right during the movement
of the rack has come into contact with the back of the right rack m and positions
its teeth in a line over the teeth of the rack f as previously described. When the
shaft a has arrived at the right the same movement repeats itself.
१
To shorten the travel of the shaft a two teeth are rendered removable at certain
parts on one side of the rack f; by moving the projections on the left as
well as the bracket with its rack a change in the direction of the movement can
be effected anywhere where the teeth or the rack is rendered removable.
The driving arrangement consists of chains and fly wheel operated either by
means of a handle, as shown in the drawings or by straps, in which case the hand
driving mechanism is removed.
In order to render the machine capable of grinding or polishing pillars the following
device is provided :-
The pillar to be ground or polished is secured between the holder A and the
centre B. The centre B with the cross beam C is rendered movable along the rods D
to enable the fixing of pillars of different sizes. Rotary motion is imparted to the
holder A by means of the chain E and the disc F either from the main driving
shaft c or from the fly wheel shaft G.
Dated this 22nd day of January 1894.
F. BOSSHARDT & Co.,
Agents to Applicants.

page_text: Improvements in Machines for Grinding and Polishing Stones, and
in other Machines having a Rack in which Traverses a Rotary
Tool Shaft.
We, NILS PETTER ÖSTBERG, Master Stone-mason, and MAGNUS AF KLINTEBERG,
Engineer, both in Lund, Sweden, 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 improvements in machines for grinding and polishing
stones and in other machines having a rack in which traverses a rotary tool shaft
and has for its object to provide devices whereby the vertical shaft, which carries
the tool, is regularly rotated in one direction as well as reciprocated laterally and
the reversing effected instantaneously.
Reference being made to the drawings filed with our Provisional Specification:
Fig. 1 is a side view, Fig. 2 an end view and Fig. 3 a vertical section of our
improved machine for grinding and polishing stones. Figs. 4, 5, 6 & 7 are views of
details thereof.
The vertical shaft a, which serves for the reception of the tool, is rotated_by
means of a pair of bevel wheels 6 from the driving shaft e having pulleys. The
bevel wheel on the shaft c is rendered longitudinally movable and is obliged
to participate in its rotation through a key employed in the boss of the said
wheel, moving in a key bed in the shaft c. A bracket d which is longitudinally
guided upon the rail e serves as bearings for the two shafts a & c. Below the
guide rail e is a double rack f the teeth of which at each end are removed, as
shown in Fig. 4. The ends of the racks are formed with flat slides 9 arranged to
move in a corresponding bracket employed at each frame end of the machine; these
brackets permit the said rack of moving to and fro. Each of the slides g is formed
with a sloth inclining in the same direction and receiving respectively a pin
fixed to the last named bracket which slot and pin cause the said racks to move at
an incline when actuated longitudinally. The rack is in gear with a pinion j
secured upon the vertical shaft a and double the width of the rack f, one half
projecting above the latter. One of the teeth of this pinion is lengthened downwards.
The two rows of rack teeth are formed at such à distance apart from each other
that the said pinion can move freely between without coming into contact with the
same so as to allow of the shaft a being rotated otherwise when retained in a
certain position by the bracket d. In order to cause the shaft a to move to and fro
upon the guide rail e, as required during the grinding and polishing operation, the
following device is provided.
4
Upon the guide rail e is employed near each end a bracket / each of which carries
an auxiliary rack m positioned in close proximity of the upper side of the rack f
and in pitch and width equal to the latter. Each of the said racks is formed with
two studs n received by corresponding holes in the bracket / so as to render the
racks m capable of moving in a horizontal plane at right angles to the length of
the rack. The racks m are periodically moved to and fro horizontally by means
of the rack and the projections o employed at suitable places thereon. Upon the
lower side of the rack fis employed at each end a plate k formed with a tooth y in
height equal to the tooth part p which projects from the underside of the pinion j.
Below the pinion j is arranged upon the shaft a a circular disc r which may move
freely below the tooth q of the plate k but capable of abuting against the side of
the latter, for which purpose the said disc is shaped as shown in Fig. 7. The
movement takes place in the following manner.
Assuming that the plates k on the rack fand the brackets / carrying the racks m

page_text: are positioned as shown in Fig. 4, and that the rack fis as far as possible to the
right, a position which may be varied by the set screws in order to retain the
pinion in proper gear with the rack side y; assuming also that the pinion; and
the shaft a revolve in the direction indicated by the arrow, the shaft a will be
obliged to move in the direction of z owing to the rack f being arrested by the set
screw a. At this time the rack m at the left is positioned with its teeth in a line with
the teeth of the rack f, the last tooth of the rack f corresponding with the first
tooth of the rack m. When the pinion engages the first tooth of the rack m, the
periphery of the disc r contacts with the plate k and continuing its rotation in the
rack m pushes the rack fin the same direction as the shaft a travels, that is to say,
towards z. By means of the inclined slot and pin i the rack is then caused to
move parallel with the said slots and when the said pinion has reached the last
tooth of the rack m its lengthened tooth p engages the tooth 9 of the plate k and
guides the rack f completely over, so that the said pinion will then be in gear with
the other side of the rack. On reversing, the teeth of the pinion abut against
the broad tooth t on the rack m, whereby the rack m will be pushed back out of
gear with the said pinion. The rack then moves to the right, until it abuts against
the set screws on that side. The projection o on the right during the movement of
the rack comes into contact with the back of the right rack m which pushes the
latter forward bringing its teeth in a line over the teeth of the rack f. The shaft a
afterwards arriving at the right repeats its movement as previously described.
To shorten the travel of the shaft a two teeth are rendered removable at certain
parts on one side of the rack f, by moving the projections k on the left as well as
the bracket with its rack a change in the direction of the movement can be
effected anywhere where the teeth or the rack is rendered removable.
The driving arrangement consists of chains and fly wheel operated either by
means of a handle, as shown in the drawings or by straps, in which case the hand
driving mechanism is removed.
In order to render the machine capable of grinding or polishing pillars the
following device is provided.
The pillar to be ground or polished is secured between the holder A and the
centre B. The centre B with the cross beam C is rendered movable along the rods D
to enable the fixing of pillars of different sizes. Rotary motion is imparted to the
holder A by means of the chain E and the disc F either from the main driving
shaft c or from the fly wheel shaft G.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that what we
claim, is―
1st. In machines for grinding and polishing stones and in other machines having
a rack in which traverses a rotary tool shaft, the employment of a double rack f
the rows of teeth of which are positioned opposite to each other and are lengthened
at each end by means of auxiliary racks m rendered movable at a right angle to
the double rack fand the latter longitudinally and laterally by such as the
slides 9, h, and brackets carrying the studs i, i, for the purpose of causing the tool
shaft a on its traverse to automatically move the rack f longitudinally in either
direction as well as laterally and thus bring the tool shaft pinion in and out of gear
with each side of the double rack f, all substantially as set forth.
2nd. In the machine specified in Claim I for the purpose of effecting the said
automatic longitudinal movement of the double rack in the direction of the shaft
axis and parallel thereto, the employment of a plates k upon the underside of the
rack near each end having a tooth q positioned between the two rows of teeth and
the pinion of the tool shaft a, a lengthened tooth p which operates in conjunction
with the tooth 9, the tool shaft a, a circular disc r operating in conjunction with
the plate k, projections o, on the double rack f adapted to move the auxiliary
racks m into the path of the tool shaft a so that the tool shaft a with its circular
disc will abut against the plate k and the lengthened tooth p of the pinion ; act

page_text: upon the tooth 9, when arriving at the rack end and whilst passing onto the
auxiliary rack, and thus bring the double rack laterally in its final position, all
substantially as set forth.
3rd. In the machine specified in Claim I, the employment of a bracket d
rendered movable upon the driving shaft c preferably guided upon a rail e or the
like and in which the shaft of the grinding or polishing or the like tool is mounted,
and two shafts c & a are geared up by means of the bevel wheels bone of which is
rendered longitudinally movable upon the shaft a in order to impart rotary motion
to the latter and permit of a to and fro motion, all substantially as set forth.
4th. In a machine as specified in Claim 1, the employment below the path of the
tool shaft a, of a holder A which may be interchanged and is rotated from the
driving shaft or by bevel wheels and a centre B opposite thereto rendered adjustable
upon a cross piece C supported by rods D for the purpose of permitting the fixing
and rotating of a round stone object, as for instance, a pillar and the like, below
the tool, all substantially as set forth.
Dated this 12th day of October 1894.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicants.