Note: Descriptions are shown in the official language in which they were submitted.
1 325887
This invention relates to a grinding tool to be
used in such mechanical grinding works as of a disc sander,
disc grinder and polisher.
Such grinding tool as a disc pad or sanding pad
to be used in such mechanical grinding works as of a disc
sander, disc grinder and polisher is used with such
grinding member as grinding cloth or paper fitted on its
lower surface.
When the grinding capacity of the fitted grinding member
reduces, the grinding member will have to be replaced. In
fitting such grinding member as the above mentioned grinding
cloth or paper to a disc pad, sanding pad or the like, there
have been already adopted a method by bonding and a method by
using a separable surface fastener.
As the above mentioned methods by bonding, there are
adopted a method wherein a disc pad or sanding pad is painted
on the lower surface with a solvent paste and such grinding
member as grinding cloth or paper is bonded to the lower
surface and a method wherein such grinding member as grinding
cloth or paper painted on the back surface with a pressure
sensitive bonding agent in
~.
1 325887
advance is pasted on the lower surface of a disc pad or
sanding pad.
However, the method by bonding using a solvent
paste has defects that it takes time to dry the paste and
that the method is not adapted to a continuous work.
Also, in the method wherein such grinding member
as grinding cloth or paper painted on the back surface
with a pressure sensitive bonding agent in advance is
used, it is necessary to paint the produced grinding
member on the back surface with the presssure sensitive
bonding agent and to further paste peeling paper to the
back surface, it- requires a trouble to manufacture the
grinding member which is thus costly, it is difficult to
peel the peeling paper off the back surface and replace
the grinding member while wearing working gloves during
the work, when the grinding capacity reduces, the
grinding member, though retaining the bonding capacity,
will have to be abandoned and it has been uneconomical.
In the method wherein the above mentioned separable
suface fastener is used, for example, a male piece of the
separable surface fastener is provided on the lower
surface of the disc pad or sanding pad and a female piece
of the surface fastener engaging with the above mentioned
male piece is provided cn the back surface of the grinding
member so as to be combined with each other.
According to this method, it is very easy to
replace the grinding member but, as one side of the
fastener, for example, the female piece is formed
integrally with the grinding member, the female piece of
the surface fastener will be abandoned simultaneously
1 325887
with replacing the grinding member and it has been very
uneconomical.
In the present invention, a surface fastener and
pressure sensitive bonding agent are effectively combined
with each other. That is to say, in the present invention,
the grinding member can be replaced in either of the surface
fastener part and pressure sensitive bonding agent part, the
efficiency of the grinding work can be elevated, it is not
necessary to abandon the surface fastener whenever the
grinding member is replaced and it is economical.
The grinding tool of the present invention comprises a
disc pad provided on the lower surface with one side of a
surface fastener, an auxiliary member provided on the upper
surface with the other side of the surface fastener connected
with the above mentioned side of the surface fastener and
painted on the lower surface with a pressure sensitive
bondinq agent and a grinding member peelably pasted to the
pressure sensitive bonding agent part.
Fig. 1 is a disassembled view of the present invention.
Fig. 2 is a magnified sectioned view of an essential
part.
~i
~!
1 325887
The present invention shall be explained in
detail in the following on the basis of the embodiment
shown in the drawings.
Fig.l is a disassembled view of a grinding
tool of the present invention.
In the drawings, the reference numeral
represents a disc pad or sanding pad which is formed of a
substrate 3 having a fitting screw 2 connected to a
rotary part of a machine and such cushioning member 4 as
a sponge rubber fitted to the lower surface and is fitted
with one side of a surface fastener 6, for example, with
a male piece 7 through a bonding agent 5.
In the present invention, the male piece 7 of
the above mentioned fastener 6 may be perfectly bonded.
By the way, in the embodiment shown in the
drawing, the male piece 7 of the above mentioned surface
fastener 6 is formed by erecting rigid linear projections.
In the drawings, the reference numeral 8
represents an auxiliary member which is provided on the
upper surface with a male piece 9 connected with the male
piece 7 of the above mentioned surface fastener 6 and is
painted on the lower surface with a replaceable pressure
sensitive bonding agent 10.
By the way, in the embodiment shown in the
drawing, the female piece 9 of the above mentioned
fastener 6 is formed by erecting a fiber assembly of a
coarse structure.
Also, the pressure sensitive bonding agent 10
can be bonded with an object to be pasted when pressed,
can befurther peeled off, can not be easily dried and is
1 325887
called also a non-drying bonding agent.
In the drawings, the reference numeral 11
represents peeling paper pasted to the above mentioned
pressure sensitive bonding agent 10 and peeled and
removed when a later described grinding member 12 is
pasted.
This peeling paper 11 may be formed to be
rather larger than the auxiliary member 8 in order to be
easy to peel. Further, tongue pieces projecting from the
periphery of the auxiliary member 8 may be provided in a
part of the peeling paper 11.
If the whole of the auxiliary member 8 is
formed to be somewhat larger than the lower surface of
the disc pad 1, the later described auxiliary member 8
replacing work will be easy.
In the drawings, the reference numeral 12
represents grinding cloth or paper fitted on the lower
surface with honing grains 13 of a predetermined
granularity by a binder.
In the present invention, as shown in Fig.2,
the male piece 7 of the surface fastener 6 provided on
the lower surface of the disc pad 1 and the female piece
9 of the surface fastener 6 provided on the upper surface
of the auxiliary member 8 are combined with each other
and the grinding member 12 is pasted to the pressure
sensitive bonding agent 10 -part applied in advance to
paint the lower surface of the auxiliary member 8 so as
to be used.
Needless to say, in fact, prior to the grinding
work, the grinding member 12 is pasted to the lower
~ 1 325887
surface of the auxiliary member 8 and then the male piece
7 of the surface fastener on the lower surface of the
disc pad 1 and the female piece 9 of the surface fastener
6 on the upper surface of the auxiliary member 8 are
combined with each other to be used.
If a plurality of the auxiliary members 8 are
prepared and various kinds of the grinding members 12 are
pasted to the respective auxiliary members 8, such
grinding works as a coarse grinding and finish grinding
will be able to be made by one touch by changing the
combination of the disc pad l with the surface fastener 6
of the auxiliary member 8 and the efficiency of the work
will be able to be elevated.
In case the grinding capacity of the grinding
me~oer becomes nil, the grinding member 12 will be peeled
off the auxiliary member 8 and another grinding member 12
will be pasted to the pressure sensitive bonding agent 10
part on the lower surface of the auxiliary member 8.
When the use is continued several times, the
pressure sensitive bonding agent 10 on the lower surface
of the auxiliary member 8 will be stained or deteriorated
with the grinding powder or the like and the bonding
capacity will be lost. At this time, the auxiliary member 8
will be replaced. That is to say, in the present invention,
as the grinding member 12 and surface fastener 6 are not
integral with each other, whenever the grindning member 12
is replaced, either side of the surface fastener 6 need
not be abandoned. It is economical.
By the way, in Fig.2, the disc pad 1 and
auxiliary member 8 are combined with each other by the
1 325887
entanglement of the male piece 7 consisting of rigid
linear projections with the female piece 9 consisting of
a fiber assembly and the combination seems to be
insufficient but, at the time of the grinding work, the
auxiliary member 8 and the disc pad 1 will be pressed by
the objecgt being ground and will not be likely to be
separated from each other but, on the contrary, will be
very easy to remove.
Also, as shown in Fig.2, there are effects
that, if a gap 44 is formed between the disc pad l and
auxiliary member 8, the radiation of heat from the
auxiliary member 8 heated at the time of the work will be
promoted, the auxiliary member 8 will not be heated more
than is required, the binder of the honing grains 13 of
the grinding member 12 will be prevented from being
softened and melted by the accumulated heat and the
honing grains will able to be prevented from dropping.
That is to say, there are obtained effects that
the grinding capacity can be prevented from being reduced
by the drop of the honing grains, the durability of the
grinding member 12 can be elevated and it is economical.
