Turntable of nylon fiber grinding wheel

An improved turntable of a nylon fiber grinding wheel, which is integrally made of plastic by injection has a predetermined amount of flexibility. The turntable has a locking hole provided at a center portion therethrough, and a ring groove encircling the locking hole on a top surface of the turntable. The ring groove has a plurality of through slot arranged spacedly and radially and defines a plurality of ribs arranged radially and respectively between the through slots. A bottom surface recess of the turntable and ring groove are overfilled with a gluing agent such as epoxy resin, so that the gluing agent would also fill in the plurality of through slots and enwrap around the plurality of ribs. Therefore, a nylon fiber grinding plate can be attached to the bottom surface recess of the turntable by means of the gluing agent. As the gluing agent is enwrapped around the plurality of ribs around the through slot, the solidified gluing agent would be in an I-shape which ensures a rigid connection between the turntable and the nylon fiber grinding plate as strong as being riveted. Therefore, the resistance force contract the torque force generated by the turning motion between the grinding surface and the working surface is increased, and thus the maximum turning speed of the whole grinding wheel can be also increased.

FIELD OF THE PRESENT INVENTION 
The present invention relates to an improved turntable of a nylon fiber 
grinding wheel, and more particularly to a turntable to which a nylon 
fiber grinding wheel can be more tightly and rigidly attached by a gluing 
agent such as epoxy resin. 
BACKGROUND OF THE PRESENT INVENTION 
The conventional method for grinding work is well known by using the sand 
paper or sand cloth to complete. In the recent years, people in this field 
have invented a new structural grinding body by using the nylon fiber for 
grinding work. When this type of grinding body are at work, a large amount 
of rubbish would be generated and settled into the pores of the nylon 
fiber. But as the rotation of the grinding body continues, the centrifugal 
force generated by the rotating grinding machine would spin out all the 
rubbish from the grinding body, and thus no rubbish would be left on the 
grinding surface. 
The conventional sand cloth or sand paper has a fine and well defined 
structure on the grinding surface. During the grinding process, a portion 
of the rubbish would build up on the grinding surface. The sand paper and 
sand cloth can not effectively remove the continuously generating rubbish. 
Therefore, as the grinding process continues, the effectiveness and 
grinding ability of the sand paper and sand cloth decreased. Due to the 
facts that the grinding body made of nylon fiber has many advantages and 
the strength of the nylon fiber is far better than the conventional sand 
cloth or sand paper, the nylon fiber grinding body has gradually replaced 
the traditional sand paper or sand cloth. Also the grinding body can be 
mounted on a turntable that is screwed on a handheld grinding machine, so 
that the high speed turning motion of the handheld grinding machine can 
drive the grinding body to rotate and effectively and efficiently provide 
a better and faster work. 
In accordance with the above description, the conventional nylon fiber 
grinding wheel 10 (as shown in FIG. 1) comprises a nylon fiber grinding 
plate 11, and a turntable 12 is attached to the nylon fiber grinding plate 
11 by a gluing agent A, wherein the turntable 12 has a screw hole 13 
centrally provided thereon for a turning axle 21 of the handheld grinding 
machine to pass through. The nylon fiber grinding wheel 10 is screwed on 
the turning axle 21 of the handheld grinding machine by a locking cylinder 
22. When the handheld grinding machine is turned on, the turning axle 21 
of the handheld grinding machine would drive the nylon fiber grinding 
plate to rotate for grinding purpose. 
However, during the grinding process, the nylon fiber grinding wheel 10 and 
the grinding surface would generate a torque force therebetween. The 
ability to resist the torque force is limited by the resistance force 
between the gluing agent A and the turntable 12 because that is the 
weakest part of the connection. As the grinding speed increases, the 
torque force generated between the nylon fiber grinding wheel 10 and the 
grinding surface would also increase. When the torque force exceeds the 
resistance force between the gluing agent A and the turntable 12, the 
turntable 12 would not be able to stay attached to the nylon fiber 
grinding plate 11, and thus the nylon fiber grinding plate 11 would be 
separated from the nylon fiber grinding wheel 10 (at this time, the 
turntable 12 is still screwed on the turning axle 21 of the handheld 
grinding machine). In view of the above disclosure, we know that the 
conventional nylon fiber grinding wheel 10 is only attached to a flat 
bottom surface of the turntable 12 by the gluing agent A. The resistance 
force generated by this type of connection is only adequate for grinding 
work at slower speed rotation below 5,000 rpm. When the turning speed is 
more than 5,000 rpm, there is a great chance that the resistance force 
would be unable to withstand the torque force and cease the grinding 
process. 
As shown in FIG. 2, another type of conventional turntable 30 is 
illustrated. The turntable 30 has radially provided a plurality of through 
holes 31 on its surface. When the turntable 30 is attached to the nylon 
fiber grinding plate 11 by the gluing agent A, the gluing agent A would 
fill the contact surface between the turntable 30 and the nylon fiber 
grinding plate 11, and that a portion of the gluing agent A would also 
fill the plurality of through holes 31 of the turntable 30. The gluing 
agent A which fills the through holes 31 would create a greater bonding 
ability between the turntable 30 and the nylon fiber grinding plate 11 (as 
shown in FIG. 3). When the contact area increases, the turntable 30 and 
the gluing agent A would also increase the resistance force that enables 
the nylon fiber grinding plate being driven to rotate at a higher speed 
between 5,000 rpm to 7,000 rpm during grinding operation. 
The truning speed of the grinding machine and the work processing speed are 
in direct proportion. The higher the grinding machine can turn, the faster 
the grinding work can be completed. All the above described conventional 
nylon fiber grinding plate can only be worked at an ideal turning speed of 
7,000 rpm and under. What if we can increase the turning speed of the 
grinding machine to a degree that the nylon fiber grinding plate and the 
turntable can handle? Then for sure we can speed up the grinding process 
and achieve better grinding performance. 
SUMMARY OF THE PRESENT INVENTION 
The main objective of the present invention is to provide an improved 
turntable of a nylon fiber grinding wheel, which is designed for enabling 
the nylon fiber grinding plate to firmly and tightly mounted thereon and 
providing a higher torque resistance force therebetween during the 
grinding operation, so that the nylon fiber grinding plate is adapted to 
run at higher turning speed at approximately 20,000 rpm. The improved 
turntable of nylon fiber grinding wheel can thus be effectively and 
efficiently provided a better and faster work. 
Accordingly, an improved turntable of a nylon fiber grinding wheel, which 
is integrally made of plastic by injection has a predetermined amount of 
flexibility. The turntable has a locking hole provided at a center portion 
therethrough, and a ring groove encircling the locking hole on a top 
surface of the turntable. The ring groove has a plurality of through slot 
arranged spacedly and radially and defines a plurality of ribs arranged 
radially and respectively between the through slots. A bottom surface 
recess of the turntable and ring groove are overfilled with a gluing agent 
such as epoxy resin, so that the gluing agent would also fill in the 
plurality of through slots and enwrap around the plurality of ribs. 
Therefore, a nylon fiber grinding plate can be attached to the bottom 
surface recess of the turntable by means of the gluing agent. As the 
gluing agent is enwrapped around the plurality of ribs around the through 
slot, the solidified gluing agent would be in an I-shape which ensures a 
rigid connection between the turntable and the nylon fiber grinding plate 
as strong as being riveted. Therefore, the resistance force contract the 
torque force generated by the turning motion between the grinding surface 
and the working surface is increased, and thus the maximum turning speed 
of the whole grinding wheel can be also increased.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIGS. 4 and 5 of the drawings, an improved turntable of a 
nylon fiber grinding wheel according to a first preferred embodiment of 
the present invention is illustrated. The turntable 40 is integrally made 
of plastic by injection and has a predetermined amount of flexibility. The 
turntable 40 has a locking hole 41 provided at a center portion 
therethrough and a ring groove 42 encircling the locking hole 41 on a top 
surface of the turntable 40. The ring groove 42 has a plurality of through 
slot 43 arranged spacedly and radially thereon, and defines a plurality of 
ribs 44 arranged radially and respectively between the through slots 43 on 
the surface of the turntable 40. 
As shown in FIG. 6A, a bottom surface recess of the turntable 40 and the 
ring groove 42 are overfilled with a gluing agent A such as epoxy resin, 
wherein the gluing agent A would also fill in the plurality of through 
slots 43 and enwrap around the plurality of ribs 44. The nylon fiber 
grinding wheel further comprises a nylon fiber grinding plate which is 
mounted onto the bottom surface of the turntable 40 by means of the gluing 
agent A. As the gluing agent A is enwrapped around the plurality of ribs 
44 and filled in the through slot 43, the solidified gluing agent A would 
be in an I-shape which ensures a rigid and tight connection between the 
turntable 40 and the nylon fiber grinding plate 11 as strong as being 
riveted. Therefore, the resistance force contract the torque force 
generated by the turning motion between the grinding surface and the 
working surface is increased, and thus the maximum turning speed of the 
whole nylon fiber grinding wheel can be also increased. 
Referring to FIGS. 7 and 8 of the drawings, an improved turntable of a 
nylon fiber grinding wheel according to a second preferred embodiment of 
the present invention is illustrated. The turntable 50 of the second 
preferred embodiment further provides a plurality of protruding teeth 51 
evenly distributed on a bottom surface thereof. The protruding teeth 51 
integrally provides more surface contact area between the turntable 50 and 
the gluing agent A to enhance the grabbing ability therebetween (as shown 
in FIG. 8B). The resistance force to the torque force is thus increased 
due to such stronger bonding ability between the gluing agent A and the 
turntable 50. 
However, as the nylon fiber grinding plate 11 continues to grind away on 
the working surface. The nylon fiber that is in contact with the working 
surface would be worn off and starts to give out from an outer periphery 
of the grinding body. 
Accordingly, the present invention provides a third preferred embodiment 
that can solve this problem, as shown in FIG. 9 of the drawing, wherein a 
turntable 60 further provides an outer periphery portion 61 extended 
outwardly and ended with a vertically extended circular covering rim 62. 
With the addition of the outer periphery portion 61 and the circular 
covering rim 62, the contact area between the turntable 60 and the gluing 
agent A has greatly increased, and thus the bonding force therebetween 
also increases. Therefore the resistance force to contract the torque 
force is enhanced. The circular covering rim 62 of the turntable 60 
disposed on the outer surface of the nylon fiber grinding plate 11 further 
provideds an unexpected result, that is the circular covering rim 62 of 
the turntable 60 serves as a cover wall to cover an outer periphery 
surface of the nylon fiber grinding plate 11, thus preventing the slip off 
of the structure. This type of arrangement not only can reduce the chance 
of the outer periphery of the nylon fiber grinding plate 11 to give out, 
but also can slow down the worn off speed of the nylon fiber. The life 
span of the nylon fiber grinding plate 11 can be extended so that the 
working effectiveness and efficient can be enhanced too.