|Publication number||US20120115404 A1|
|Application number||US 12/942,891|
|Publication date||May 10, 2012|
|Filing date||Nov 9, 2010|
|Priority date||Nov 9, 2010|
|Publication number||12942891, 942891, US 2012/0115404 A1, US 2012/115404 A1, US 20120115404 A1, US 20120115404A1, US 2012115404 A1, US 2012115404A1, US-A1-20120115404, US-A1-2012115404, US2012/0115404A1, US2012/115404A1, US20120115404 A1, US20120115404A1, US2012115404 A1, US2012115404A1|
|Inventors||Frank Alison Houghton|
|Original Assignee||Frank Alison Houghton|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (23), Referenced by (1), Classifications (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
The present invention relates to a device for the finishing of irregular shape objects by using a hand held drum sander in general and in particular to a self contained power driven device having a novel method of driving and supporting the sanding drum and retaining the sanding substrate.
2. Description of the Prior Art
A sander is a power tool used to smooth wood and automotive or wood finishes by abrasion with sandpaper. Sanders have a means to attach the sandpaper and a mechanism to move it rapidly contained within a housing with means to handhold it or fix it to a workbench. Woodworking sanders are usually powered electrically, and those used in auto-body repair work by compressed air. There are many different types of sanders for different purposes. Multi-purpose power tools and electric drills may have sander attachments. For example, U.S. Pat. Nos. 5,678,292 and 5,957,765 to Kimbel et al. disclose a hand-held machine tool which may be used for sanding a work piece. Oscillation of the sanding tool is provided by one of several proposed oscillation devices.
Woodworking sanders include:
Accordingly, several objects and advantages of my invention are that irregular shape objects can be smoothed and shaped by using a hand held drum sander. It also is in particular a self-contained power driven device having a novel method of driving and supporting the sanding drum and retaining the sanding substrate. This device will facilitate the ability of the average handyman to smooth and finish irregular shaped objects, such as table legs, gun stocks, etc., without the need to resort to laborious hand sanding that is required at present for these tasks. This device can also be used for many other finishing functions, similar to a general woodworking sander.
The motor assembly 15 is a fixed shaft motor. The center shaft of the motor does not rotate, but is fixed to the right housing 18 by a press fit into a sleeve molded into the right housing 18 center bore. The motor assembly 15 is therefore constructed inside out from conventional rotating shaft motors.
The end cover 9 is used to support the cantilevered end of the motor assembly 15 and protect the motor assembly 15 for the user and vice versa. The screw 14 threads into the left housing 20 to retain the end cover 9. The end cover 9 is also retained by a boss molded to the left housing 20 that fits in an elongated hole in the end cover 9 and prevents it from rotating about the screw 14.
The operator will need to change the sand paper 17 at the appropriate time. The sand paper 17 is changed if the desired results are not being obtained with the present piece of sand paper 17. Finer or courser grit sand paper 17 my be required to complete the job. The sand paper 17 also wears and no longer yields good results after hard continuous use. To change the sand paper 17, the tool is laid on its right side, with the screw 14 and end cover 9 facing up. The screw 17 is removed and then the end cover 9 is removed. Next, the nut 7 is turned in a counter clockwise direction by placing the spanner wrench provided in the slots in the nut 7 and resisting the rotation of the motor assembly 15 with the operator's other hand. Once the nut 7 is removed, the rubber sleeve 16 will shrink down in diameter and the sand paper 17 can be freely slid off the motor assembly 15. New sand paper 17 can now be slid onto the drum and positioned. Once this is complete, the nut 7 is reinstalled and tightened. After these tasks are completed, the end cover 9 is installed over the pin boss in the left housing 20 and the conical end of the motor shaft 23. The screw 14 is then installed and tightened. The pin boss and the conical end of the motor shaft 23 together completely define the position of the end cover 9, and the screw is used to restrain the end cover 9 in this position. The end cover 9 provides an out board support for the motor shaft 23 to resist the over-tuning moments placed on the motor shaft 23 by the work load from the operator pushing the sand paper 17 into the part to be sanded.
Thus the reader will see that the Handheld, Portable Drum Sander invention provides a highly reliable, lightweight, yet economical device that allows the operator to finish irregular shaped objects and other parts.
While my above description contains many specificities, these should not be construed as limitations on the scope of the invention, rather as an exemplification of one preferred embodiment thereof. Many other variations are possible. For example, the housing 18 & 20 could be constructed for metals to add rigidity to the tool. The power source could be changed from a battery to a wall plug. The tool would not be portable, if this were done, but the resulting product cost could be reduced. The sandpaper could be retained to the drum using adhesive instead of the present clamping method. Again these efforts could lower the tools cost, but would also lower the tools versatility.
Accordingly, the scope of the invention should be determined not by the embodiment illustrated, but by the appended claims and their legal equivalents.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|DE102014200401A1 *||Jan 13, 2014||Jul 16, 2015||Bayerische Motoren Werke Aktiengesellschaft||Schleifwerkzeug mit einem Schleifkörper mit innenliegendem Antrieb|
|Cooperative Classification||B24B23/02, B24B23/06|
|European Classification||B24B23/02, B24B23/06|