Abrading – Frame or mount – Portable abrader
Reexamination Certificate
2002-04-12
2003-12-09
Morgan, Eileen P. (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S351000, C451S513000, C451S525000
Reexamination Certificate
active
06659851
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fastening device for a polishing paper cloth, which is to be attached to and detached from a polishing base plate of a portable polishing machine and on which surface the polishing paper cloth is mounted. Particularly, it relates to a fastening device for a polishing paper cloth which is applicable in a portable polishing machine of such a type that the polishing is carried out at a front end portion of its polishing base plate.
2. Description of the Related Art
Conventionally, a portable polishing machine has been used on many occasions so as to deal with various abrasive operations. One example of this portable polishing machine comprises a main body with a handle grip and has a configuration similar to that of an iron for household use, from which the base plate is detachable. An attaching portion of the base plate with respect to the polishing machine main body may be connected to an oscillation source, or alternatively the whole polishing operation may be performed manually. On a surface of a front end portion of the base plate, a detachment portion for a fastening device, which serves to detachably support a fastening device to which a male member of a surface fastener is fixed, is integrally formed.
One example of a fastening device for a polishing paper cloth to be used for this kind of a manual polishing machine is disclosed in Japanese Patent Application Laid-Open No. 2000-176818. The fastening device for a polishing paper cloth as disclosed in this publication is a molded product made of synthetic resin such as polyester elastomer resin and various hard rubbers. The fastening device of the polishing paper cloth comprises an attachment portion which is attachable to and detachable from a base plate of the polishing machine and a main body for winding and fastening the polishing paper cloth thereon. On the fastening device main body, a plurality of surface-fastener engaging element rows, which are arranged along a winding direction of the polishing paper cloth, are integrally formed so that it forms an engaging surface. The polishing paper cloth is fixed to the engaging surface by engaging a pile member (a female surface fastener) formed on a rear surface of the polishing paper cloth.
The attachment portion of the fastening device has a long and narrow cubic shape having a substantially trapezoidal cross section. The foregoing fastening device main body is integrally connected to a bottom surface of the attachment portion and it is comprised of a horseshoe-like body having such a cross section that is enclosed by a circumference of not less than a half circle and tangent lines contacting on the same circumference. From front and rear end surfaces of the fastening device main body up to a substantially central portion thereof, cavity portions, which are blind and have centers at a central line of the half circle cross section, are formed in the longitudinal direction. This cavity portions secure the flexibility by facilitating elastic deformation of the fastening device, which is made of hard resin so that it is necessary to provide it with some flexibility at least in the vicinity of the front and rear of the fastening device upon polishing.
In the meantime, in the polishing operation, the portable polishing machine carries out the operation by attaching the fastening device to which the polishing paper cloth is winded to be integrally engaged therewith, strongly pressing the main body portion of the fastening device to a surface of a work piece to be polished and then operating it along an exterior shape of the work piece. At that time, extremely strong oscillation acts on the fastening device due to the polishing machine in many directions. Therefore, although the oscillation of the polishing machine is transmitted to the hand, the arm and the like of an operator through the fastening device, the operator is obliged to strongly press the fastening device on the surface of the work piece against these oscillation. Thus, the operator gets more and more physically tired. Further, in the long run, the operator is given to suffering from a disease such as an inflammation or the like on his or her hand, arm and the like for a long term.
In general, if the fastening device is made of a material having flexibility, it is possible to suppress a reaction applied to the operator by absorbing the oscillation. However, the fastening device, which is disclosed in the above described Japanese Patent Application Laid-Open, is molded of synthetic resin having less elasticity such as polyester elastomer resin and various hard rubbers, so that it is difficult to sufficiently absorb the oscillation.
Therefore, according to the above described prior art, the fastening device is made so as to be easily deformed elastically by forming cavity portions in an interior of the fastening device main body around which the polishing paper cloth is to be winded and with which the polishing paper cloth is to be engaged, so that it is possible to secure the flexibility of the fastening device. However, the cavity portions are formed in the longitudinal direction of the fastening device as described above so that they positively can allow the elastic deformation in the front and rear directions of the fastening device main body by their structures, they can hardly allow the elastic deformation in the longitudinal direction of the fastening device main body. Therefore, depending on the material to be used for the fastening device, the flexibility is not sufficient only with these cavity portions, so that it becomes difficult to suppress the reaction acting on the operator by the oscillation of the polishing machine generated upon polishing.
Furthermore, in the polishing operation, the extremely large force acts on both of the fastening device main body and the polishing paper cloth in many directions as described above. Therefore, friction heat is generated not only when the polishing paper cloth and the work piece to be polished by this polishing paper cloth are in friction with each other but also when the fastening device main body and the polishing paper cloth are in friction with each other. This friction heat to be generated upon the polishing is transmitted to the fastening device main body through a portion where the fastening device main body and the polishing paper cloth are in friction with each other, so that the fastening device main body melts by this large amount of friction heat to be deformed into an irregular shape.
Still further, according to the above described prior art, the fastening device main body has a plurality of surface-fastener engaging element rows which are integrally formed on a portion thereof directly serving the polishing so as to form an engaging surface. In this case, an non-engagement area, which has no engaging elements, is formed between the engaging element rows of the surface fastener. When the polishing operation is not carried out, a rear surface of the polishing paper cloth is engage with the engaging surface locally in such a manner that it is detached from the non-engagement area of the fastening device main body. Therefore, the polishing paper cloth does not positively is not in contact with the non-engagement area of the fastening device main body.
However, in the polishing operation, if the polishing operation is carried out by strongly pressing the fastening device to the work piece to be polished and operating it along the exterior shape of this work piece, the non-engagement area of the fastening device main body and the rear surface of the polishing paper cloth necessarily contact with each other by the pressing force. As a result, a gap between the fastening device main body and the rear surface of the polishing paper cloth is closed so as to shut off the outside air and block the ventilation, so that the heat radiation from the rear surface of the fastening device and the polishing paper cloth to the exterior becomes insufficient.
Still further, if the poli
Murasaki Ryuichi
Takahashi Yoshinobu
Takizawa Toshiaki
Bell Boyd & Lloyd LLC
Morgan Eileen P.
YKK Corporation
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