Not Applicable.
Not Applicable.
The present invention relates to rotary floor sanders, and more particularly to an adjustable sander pad assembly for rotary floor sanders that provides adjustable stiffness of the sanding pad for improved sanding of surfaces.
For years now professional floorers and do it yourselfers have been finishing their hardwood floors in their homes with equipment that consists of machines like industrial grade 7″ rotary floor sander edgers that use a sander pad. This machine performs the task of sanding the floor at the base of a wall where the larger floor sanders cannot reach. This machine will take the top layer of wood surface from the floor to expose the undamaged unvarnished wood to later refinish for a greater appearance. During the process of sanding the floor the process has multiple steps requiring different amounts of stiffness in the sander pad.
The first step in edging along the base of a wall is to use the 7″ floor sander edger with a rotating tool that is usually rigid enough to allow for the abrasive surface that is applied to the tool to remove greater amounts of wood when pressure is applied. This process removes the surface varnish previously applied to the floor and also deep surface abrasions in the floor. The second step is to replace the rigid sanding pad for one that is more flexible to sand finer details. The process of removing the sander pad from the rotary sander and replacing it with a different pad can be a complicated and time-consuming one.
The present invention allows the changing of the sander pad from a stiffer pad to a more flexible pad with a simple adjustment that is quick and easy by using the claimed adjustable sander pad assembly.
An adjustable sander pad assembly having a backer flange, multiple support fingers, multiple adjustment supports, and an adjustment ring where the multiple support fingers each has a first and a second attachment point and where the first attachment point is attached to the adjustment support and the second attachment point is attached to the adjustment ring. The support fingers, the adjustment supports and the adjustment ring are mounted on the backer flange. The adjustment ring is rotated to move the support fingers and adjustment supports radially from a retracted support position to an extended support position.
Preferably, the adjustable sander pad assembly also has a sander plate, a fixing ring, and a flex plate. The sander plate is mounted on the backer flange. The fixing ring attaches fixedly to the backer flange and secures the multiple support fingers, the multiple adjustment supports, and the adjustment ring. The flex plate is fixedly attached to the backer flange over the fixing ring.
When the adjustable sander pad assembly is in the extended position, the sander pad assembly is more rigid, and when it is in the retracted position, the sander pad assembly is more flexible.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Adjacent the channels 46 are guide mounts 33 that have pairs of threaded screw holes 50 and 54. As shown in
Support fingers 12 are essentially elongated and narrow. They have a first attachment point 41 and a second attachment point 42, one at each end. Typically, the number of support fingers 12 is the same as the number of channels 46. The adjustment supports 14 have an essentially planar top 43 and a bottom surface with a radial projection 44. The radial projection 44 is sized to moveably nest inside the channel 46.
As shown in
As shown in
A sander plate 18 is used to fix the support fingers 12, the adjustment supports 14 and the adjustment ring 22 in place on the backer flange 10 by attaching to the guide mounts 33. When mounted to the backer flange 10, a finger space 56 is created between the sander plate and the backer flange that allows the finger supports to move from the retracted to the extended positions. The sander plate is circular with a central opening and guides 39 extending outward radially. There the same number of guides as there are adjustment supports, and the guides are designed to nest between the adjustment supports when they are in either the retracted position or the extended. Preferably, the guides are tapered inward toward the center of the sander plate. In a preferred embodiment, the guides are dovetailed to hold the adjustment supports in place when the flex plate 26 is removed. Preferably, the adjustment supports are likewise dovetailed to nest in the guides. Screws 20 are mounted through the sander plate 18 at screw holes 38 into the backer flange 10 at threaded screw holes 50.
In a first embodiment, fixing ring 24 has threads 48 on its perimeter that fixedly attached to the threaded portion 32 of backer flange 10. When attached, it mounts the support fingers, adjustment supports and adjustment ring to the backer flange.
A flex plate 26 is fastened over the remaining components by flex plate screws 28 which pass through the sander plate at openings 37 and mount on backer flange 10 in screw holes 50.
The purpose of the adjustable sander pad assembly is to remove the need to disassemble the tooling for the 7″ floor sander edger when increasing or decreasing flexibility. The adjustable sander pad assembly 1 is mounted onto the jackshaft of the 7″ floor sander edger. Sandpaper is attached to the surface of the flex plate 26. Tipping the 7″ floor sander edger so that the backer flange 10 is facing the user, the set screw 30 is located and a hex tool is used to loosen the screw until adjustment ring 22 is able to rotate freely. There are two positions that the adjustment ring 22 can be rotated to and locked: the extended position and the retracted position. When the adjustment ring 22 is rotated the components that are retained by the sander plate 18 extend or retract the components that are tied to the adjustment ring 22. Attached to the adjustment ring 22 are the support fingers 12 and the adjustment supports 14. In this embodiment, there are six of these components around the circumference of the backer flange 10 and attached to the adjustment ring 22. These components are able to pivot at the first and second attachment points 42 by use of a bearing or pin 16. When the adjustment ring 22 is rotated to the desired position, the radial projection 44 on the bottom of the adjustment support 14 moves in the channel 46 on the backer flange 10. The adjustment support is sandwiched between the backer flange 10 and the flex plate 26, but is able to move freely.
When the user of the sander tool needs more rigidity for more aggressive sanding, the adjustment ring 22 is rotated counter clockwise to extend the adjustment supports to the outer edge of the backer flange 10. See
When it is desired that the sanding tool needs to be more flexible for finer sanding, the adjustment screw is loosened and the ring 22 is rotated clockwise to retract the adjustment supports away from the outer edge of the backer flange 10. See
As shown in
In the second embodiment, the key 60 is used to rotate the key adjustment ring 31 to move the adjustment supports from the retracted position to the extended position and back. The retainer button 29 locks the adjustment supports in the retracted position, and is released when the key is inserted to turn to the extended position.
The embodiments were chosen and described to best explain the principles of the invention and its practical application to persons who are skilled in the art. As various modifications could be made to the exemplary embodiments, as described above with reference to the corresponding illustrations, without departing from the scope of the invention, it is intended that all matter contained in the foregoing description and shown in the accompanying drawings shall be interpreted as illustrative rather than limiting. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims appended hereto and their equivalents.
This utility patent application claims the benefit of provisional patent application 62/503,245 filed May 8, 2017, which is hereby incorporated by reference.
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Number | Date | Country |
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WO-2017186551 | Nov 2017 | WO |
Number | Date | Country | |
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20190134773 A1 | May 2019 | US |
Number | Date | Country | |
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62503245 | May 2017 | US |