Patent Application
20120125171
This application claims the benefit of CN 201010574806.3, filed on Nov. 24, 2010, the disclosure of which is incorporated herein by reference in its entirety.
The subject disclosure relates to power tools and, more particularly, relates to a borer for a power tool in which the power output shaft oscillates back and forth in a small deflection angle at a high frequency to output power to drive a tool mounted thereon to perform operations of removing materials in a vibrating manner.
Oscillating tools, also known as multifunctional tools, which have various functions according to the different types of accessories mounted on their working head, such as the blades for sawing, the sanding plates for grinding and the like, are generally known. The working principle of an oscillating tool is that an oscillating driver drives the accessory mounted on its working head in a small deflection angle at a high frequency so as to perform operations of removing materials.
Oscillating tools mounted with saw blades are widely used for sawing various sheet materials, tube products, and the like, as such tools have the advantage of having high cutting efficiency and ease of operation, i.e., they may be conveniently used in many situations. However, since the saw blades of such existing oscillating tools for sawing are generally plate-shape saw blades having straight cutting edges, processing a hole requires many cutting steps, is inconvenient, and is relatively inefficient.
A saw blade used in connection with a hole saw known in the art makes rotational movement and a drill bit is fastened at the center of the saw blade of the hole saw for centering the saw blade. This hole saw blade is mounted on power tools such as an electric drill and the like which outputs the power in rotating manner so that a hole can be processed at one time with high efficiency. However, a hole saw blade is generally configured only with a circular section due to the limitation of its rotating output manner, and thus is only applicable for processing a circular hole, i.e., it is unable to process those holes of which the shape changes abruptly and transits non-smoothly.
To overcome the deficiencies of the above prior art, the below describes a borer for an oscillating tool. Since the oscillating tool drives the accessories in an oscillating manner, which is different from the rotating movement of the output of an electric drill and the like, if the oscillating tool is mounted with the subject borer having a section shape which is not limited to the circular shape, e.g., a triangle, quadrangle or even pentacle shape, it will be able to process more profiled holes. More particularly, the following describes a borer for an oscillating tool, comprising a fastening portion which has a receiver for mounting on the oscillating tool, the receiver defining a longitudinal axis about which the borer is driven in a vibrating manner, and a cutter which is connected with the fastening portion and has a material processing area, wherein the feeding direction of the cutter is substantially parallel to the longitudinal axis. The material processing area of the cutter may be substantially closed in circumferential direction, particularly where the circumferential direction is about the longitudinal axis of the borer, and/or may be constructed to include at least one substantially straight portion. The material processing area may be constructed as an area for sawing, grinding or cutting and may be constructed as a triangle, square, pentacle, or other shape.
A localizer having a locating end protrudable from the bottom edge of the material processing area of the cutter may also be included. A first spring element may then be provided to act on the localizer so that the localizer tends to bias towards the locating end.
A pushing out element may also be provided to push out the workpiece remaining in the cutter after processing. The pushing out element may comprises a second spring element of which one end is fixedly connected to the borer or fixedly connected to a flange mated with the output shaft and another end can be freely hang out of the bottom edge of the material processing area of the cutter.
As illustrated in
With reference to
The oscillating tool 10 can be provided with a localizer 5 for locating when the borer 20 is boring a hole. The localizer 5 acts as a centering device, i.e., a centre, and a spring 4 acts on the upper end of the localizer 5. When the spring 4 is in an uncompressed state, the lower end of the centre can protrude out of the bottom edge of the material processing area 22 ′ of the cutter 22. Both the localizer 5 and the spring 4 are mounted within the central holes of the output shaft 2 and a flange 7. With reference to
The oscillating tool and the borer used on the oscillating tool disclosed are not, however, intended to be limited to the illustrative examples provided. Rather, various alternatives may be arrived at by those of ordinary skill upon consideration of the teachings set forth herein. For example, to bore holes on the workpiece 8, the material processing area 22′ of the cutter 22 on the oscillating tool 10 is not required to be completely closed in the circumferential direction, and it can also achieve the aim of boring holes in the case that there is a little gap in the area 22′. Since the oscillating tool oscillates back and forth about the axis, and it can also saw the area of the workpiece that is in this gap, as long as the deflection angle is slightly bigger than this gap. Furthermore, the cutter 22 having the material processing area 22′ closed in circumferential direction may be moved not about the longitudinal axis Y, but about an axis parallel to the longitudinal axis Y. The spring used as the pushing out element 6 may directly abut against the borer 20 or the flange 7, without being fixedly connected with the borer 20 or the flange 7 as illustrated. Yet further, the material processing area 22′ of the cutter 22 can be constructed as an area for sawing, grinding or cutting, for example by using saw teeth, sanding disc, blade and the like. Accordingly, all obvious changes, substitutes or amendments to the shape and position of the components described herein are intended to fall within the protection scope set forth in the claims which follow.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201010574806.3 | Nov 2010 | CN | national |
