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Патент USA US3041803

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`July 3, 1962
Filed Aug. l, 1960
United States Patent O
Akio Shimizu, 35 Minamigata, Gebe-cho, Anpachi-gnn,
Gifu-ken, Japan
Filed Aug. 1, 1960, Ser. No. 46,497
2 Claims. (Cl. 51-1S0)
The present invention relates to an automatic grinder
suitable for polishing a surface of masonry of marble,
granite, artiñcial stones, tile and the like.
It has been known to polish the surface of stones such
as marble, granite, artiiicial stones, tiles and the like by
employing a grinding machine which has a grinding mem
ber which rotates around its axis while it is maintained in
contact with a surface to be worked.
Patented July 3, 1962
In such a grinding
machine, if the grinding member can be moved axially
while it is rotated around its axis and the pressure applied
to said member can be adjusted in order to keep the mem
ber pressed against the surface to be worked with a
constant force irrespective of the roughness of the sur
face to be worked, good results will be obtained and the
wear and tear on the grinding member will be lessened.
Furthermore, since even if the grinding member is
worn, it can be advanced to contact the surface with con
stant pressure so that the grinding member can be used for
a long time with no necessity of replacing it.
An object of the present invention is to provide such a
grinding machine which has relatively simple construction
so arranged that when the pressure in the cylinder reaches
a certain value the switch 22 is operated to stop the motor
M2 supplying fluid into the cyinder 1. For the mainte
nance of the pressing force, the device described above is
not sufficient alone, since the surface S of the stone work
is irregular and protrudes in some parts and is recessed
in others. When the grinding member 8 is against the
protruding part, the piston 6 is moved to the right to
increase the pressure in the left chamber of the cylinder 1.
In order to overcome such an increase, the apparatus
of the present invention is provided with an automatic
pressure adjuster 16 affixed to the pipe 12. This adjuster
16 comprises a valve 24 which is normally closed by the
action of a spring 2S. When the pressure in the cylinder
and consequently that in the pipe 12 is increased due to a
protrusion on the surface S, the valve 24 is opened against
the force of the spring to allow the iiuid from the pipe 12
to move into a discharge pipe 19 and thus the pressure in
the cylinder 1 is lowered to a predetermined value and the
valve 24 is again closed by the action of the spring 25.
When the grinding member 8 confronts a recessed part of
the surface S, the pressure in the cylinder 1 is lowered and
the mete-r 21 operates the switch 22 to drive motor M2
to introduce fluid into the cylinder. Accordingly, even
if the surface S is irregular, the grinding member 8 can
be pressed against the surface with substantially constant
pressing force. In the drawing, 17 represents a two-way
cock which connects the pipe 12 selectively to the intro
duction pipe 18 or the discharge pipe 19, and 20 is a
and can satisfactorily achieve the functions described
handle for operating the cock 17 .
The operation of this machine is as follows. When
Another object of this invention is to provide a grinding
it is desired to begin a grinding operation, the handle 20
machine as described above which has means for supplying
is operated to connect the pipe 18 to the pipe 12. It iS
automatically a liquid such as water, oil and the like to
arranged so that this operation of the handle 20 also
the processed surface to improve the ñnished surface and 35 starts the driving pump motor M2 for supplying ilnid into
to lessen the wear and tear on the grinding member.
the cylinder through pipes 18 and 12. When the pressure
The above described features and advantages as Well
in the cylinder 1 reaches a predetermined value, the pres
as other features and advantages will be understood clearly
sure meter 21 operates the switch 22 to stop the supply
from the following detailed explanation reference being
of fluid into the cylinder 1.
made to the accompanying drawings in which:
FIG. 1 is a schematic side view partly in section illus
trating one grinding machine provided according to the
In the meantime, the rotation of the cyinder 1 and con
sequently the rotation of the rod 7 and the grinding mem
ber 8 is started lby motor M1 adapted to rotate the pulley
2. Accordingly when the machine is applied onto a sur
face S, 'the grinding action on the surface is effected.
During this action, the pressure adjuster 16 and the meter
21 associated with the switch 22 operate automatically to
present invention; and
FIG. 2 is a similar schematic view illustrating another
embodiment of the present invention.
In FIG. 1, a hollow cylinder 1 having a cylinder head
3 fixed at one end and a ñxed pulley 2 in the middle is
rotatably mounted on a frame S by means of bearings 4
and 4’. A piston 6 fixed at the end of a rod 7 is slidably y
movable in this cylinder and said rod has a fixed grinding
member 8 at the other end. The cylinder 1 is rotated by
a driving motor M1 through the intermediary of the pulley
2. The cylinder head 3 has a key 10 and the rod 7 is pro
vided with a key groove '9 in engagement with said key 10.
Consequently, when the cylinder 1 is rotated, the rod 7
maintain the pressure in the cylinder practically constant
and therefore satisfactory Working can be attained with
little wear and tear of the grinding member 8. When the
work is completed, the pipe 12 is connected yto the dis
charge pipe 19 by operating the cock 17 by the handle 2t).
Under this condition, the piston 6 is moved to the left
under the action of the spring 11 and fluid in the left
chamber of the cylinder is discharged through the pipe
Said operation of the
is also rotated together with the fixed grinding member 8.
handle 20 may be connected to a means which acts to stop
Into the chamber within the cylinder, a pressure fluid
the motor M1 for driving the pulley 2 and also to stop the
is supplied from a pump and motor M2 through pipes 1S
motor M2 for driving the pump for the introduction of
and 12. ln the drawing, 13 represents a packing which
ñuid into the cylinder 1. In this specification, a de
provides fluid tightness between the pipe 12 and the cylin 60 scription of such means is omitted since it is easily pro
vided by those skilled in the art.
der 1. When fluid is introduced to the left side of the
In a grinding operation, it is often desirable to have a.
piston 6, the piston is pushed to the right against the force
fluid such as water, oil and other suitable liquids on the
of a spring 11 inserted between the piston 6 and the cylin
der head 3 and thus the grinding member 8 fixed at the 65 surface under working for increasing workability of the
surface and the prevention of excessively high tempera
end of the rod 7 is pressed against the surface S confront
ing the grinding member.
12 -into the discharge pipe 19.
l ture and so forth.
In the drawing, 14 represents a pipe which passes
It is one of the important features of the present inven
through the interior of the pipe 12, the cylinder 1, the rod
tion to press the grinding member 8 with substantially
constant force against the surface to be worked. For 70 7 to the center hole 14’ of the grinding member 8 and is
connected to a source of such fluid through a cock 23.
this purpose, a pressure meter 21 and a switch 22 con~
When the supply of such a ñuid is required, the cock is
trolled by said pressure meter 21 are provided and it is
operated to connect the source of the ñuid to the pipe 14.
The operation of this cock 23 may also be associated with
the operation of the handle 2t) so that the supply of the
fluid to the surface Sis always effected when this grinding
machine is operated.
The embodiment of FIG. 2 is `substantially the same as
that of FIG. 1 excepting that the cylinder 26 is not rotated
and the rod 31 of the piston 30 is rotated.
As illustrated in the drawing, a cylinder 26 has fianges
27 and 28 on opposite ends and is íixed on a frame 29 by
said flanges. A piston 30 rotatably mounted on a rod
31 by means of bearings 32 and 33 is slidable in the cyl
inder 26 in the axial direction together with the rod 31.
The rod 31 is rotatably supported on the frame by means
of a bearing 34 and has a grinding member 35' at the end
opposite to the piston 30. The rod 31 has a key groove 36
which is in engagement with a key 38 of a pulley 37 ro
tatably mounted on the frame 29.
When the pulley 37 is rotated by a motor M3 the rod 31
is also rotated to rotate the grinding member 35, but
when fluid is introduced into the right chamber of the
cylinder 26, it can be moved axially to the left together
with the piston 30 and the grinding member 35. A pipe
39 is connected to the right end of the cylinder 26 for the
introduction and discharge of ñuid. In the drawing, 21 is
a pressure meter, 22 a switch for the operation of a motor
The grinding operation of the apparatus of the present
invention can be operated very smoothly to give very
satisfactory results due to the presence of the automati
cally operated switch 22 and pressure adjuster 16.
When it is desired to polish wide Walls of marble,
granite, tiles and the like, this can be achieved easily by
moving the grinding machine with no necessity of remov
ing the stones or tiles from the wall in a relatively short
time to restore the beautiful appearance of new buildings.
This grinding machine can be applied conveniently even to
a surface which has irregularities with no fear of break
ing the machine through the excessive stress which may be
caused if excessive pressure is caused in the cylinder and
other constituent elements. The Working may be carried
out uniformly Without leaving unpolished spots on the
surface. Moreover when a liquid is supplied to the sur
face under working, this can `also be attained automati
cally with no troublesome operations to obtain an ex
cellent finished surface and to avoid excessive Wear and
tear on the grinding member.
What is claimed is:
1. An automatic machine for grinding and polishing a
masonry surface, said machine comprising a cylinder, a
piston slidably mounted in the cylinder, a rod coupled to
said piston and defining an axis, said rod being coupled to
said cylinder and being rotatable on said axis in response
to rotation of the cylinder, said rod being movable in axial
cylinder, 19 a discharge pipe, 16 a pressure adjuster, 17 a
direction together with said piston, a grinding member on
two-way cock, and 20 a handle respectively, and their con
said rod, means for rotating the rod, means for intro
structions and functions are same as the corresponding
30 ducing a pressure medium into the cylinder to move the
par-ts of FIG. l.
piston and thereby said rod, pressure responsive means
By the operation of the handle 20, fluid is introduced
coupled to the cylinder and coupled Vto `and adapted to
into the cylinder 26 through the pipe 18, the cock 17, the
control the means for introducing fluid >into the cylinder
pipes 40 and 39 to move the piston 30 and consequently
M4 for the introduction of fluid via pipe 18 into the
when pressure in the cylinder varies with respect to a pre
the grinding member 35 against a surface S with substan
determined value, and a pressure adjuster means coupled
tially constant pressure by virtue of the pressure adjuster
to said cylinder and comprising a valve which is adapted
16 and also the meter 21 and the switch 22. When the
to be opened when the pressure in the cylinder is above
cock 17 is operated to connect the pipe 40 to the discharge
a predetermined value to allow the discharge of said
pipe 19, the piston 30 is moved to the right under the
medium from the cylinder, said grinding member being
action of a spring r4-2 inserted between the piston 30 and
the left end of the cylinder 26. During the working oper 40 adapted for being rotated and applied to said surface
under substantially constant pressure irrespective of ir
ation, the pulley 37 is rotated by motor M3 to rotate the
regularities in the surface.
rod 31 and the grinding member 35. 40 represents a
2. A machine according to claim l comprising means
casing covering the grinding member 35 and a pipe 41 is
for supplying a iluid through said rod to said surface.
provided to supply a desired liquid such as water and oil
inside said casing 140. Thus any 4desired liquid may be sup 45
References Cited in the tile of this patent
plied between the grinding member 35 and the surface S
to be Worked.
Cavicchi ______________ __ Aug. 9, 1932
The apparatus of FIG. 2 has less parts where leakage of
Wemhoner __ _________ __ Sept. 12, 1944
iluid may take place and is more compact in comparison
Bissey _______________ __ June 3, 1958
with that of FIG. 1, and therefore it is more suitable when 50 2,836,996
the available space for the installation is narrow.
Laverdisse ___________ __ Sept. 29, 1959
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