Abstract
An extender for a buffing pad assembly having a first portion configured to be rotated, thereby transferring power from a power tool to a buffing pad, and a second portion that can be held by a user to support, direct, and/or control the buffing pad during operation of the power tool. The extender preferably includes a shaft, a sleeve, and at least one retainer for fixing the sleeve onto the shaft. The shaft preferably includes a first portion near a first end, a second portion near a second end, and a third circular portion located therebetween. In one embodiment, the shaft includes first and second grooves, thereby allowing a first retainer (e.g., C-clip) to be snapped into the first groove, the sleeve slid over the open end of the shaft, and a second retainer (e.g., C-clip) snapped into the second groove, resulting in a fully assembled extender.
Claims
1. An apparatus for connecting a buffing pad to a power tool that can be held by a hand of a user during operation of said power tool to support said buffing pad while it is being rotated, comprising: a metal shaft having first and second ends, one of which is configured to mate with a rotatable spindle of said power tool and the other is configure to mate with said buffing pad, said metal shaft comprising a first portion extending from said first end, a second portion extending from said second end, and a third portion that is substantially round and located between said first and second portions, wherein said second portion adjacent said third portion has a circumference that is greater than a circumference of said third portion, thereby creating a shoulder between said second and third portions; a sleeve having a substantially circular aperture with a circumference that is greater than said circumference of said third portion and less than said circumference of said shoulder, said sleeve being configured to slide over said first portion of said metal shaft and onto said third portion, said shoulder preventing said sleeve from sliding over said second portion of said metal shaft; and a first retainer configured to mate with said first portion of said metal shaft adjacent said third portion, thereby preventing said sleeve from sliding over said first portion of said metal shaft after said sleeve has been slid onto said third portion of said metal shaft; wherein an outer surface of said sleeve is configured to be gripped by said hand of said user during operation of said power tool, thereby preventing said sleeve from rotating while said metal shaft is rotating within said aperture.
2. The apparatus of claim 1, further comprising a second retainer configured to mate with said second portion of said metal shaft adjacent said third portion, said second retainer creating said shoulder.
3. The apparatus of claim 2, wherein said metal shaft has a recess where said second and third portions meet, and said second retainer comprises a C-clip configured to mate with said recess.
4. The apparatus of claim 1, wherein the metal shaft has a recess where said first and third portions meet, and said first retainer comprises a C-clip configured to mate with said recess.
5. The apparatus of claim 4, further comprising a second C-clip, wherein said metal shaft has a second recess where said second and third portions meet, said second C-clip being configured to mate with said second recess.
6. The apparatus of claim 1, wherein said first end comprises male threads and said second end comprises female threads.
7. The apparatus of claim 1, wherein a circumference of said shoulder is less than an outer circumference of said sleeve.
8. The apparatus of claim 7, wherein an outer circumference of said first retainer is less than an outer circumference of said sleeve.
9. The apparatus of claim 1, wherein said metal shaft comprises a first flat surface and a second flat surface opposite of and parallel to said first flat surface, said first and second flat surfaces being configured to be gripped by a wrench during said metal shaft being attached to or removed from said buffing pad or said power tool.
10. The apparatus of claim 9, wherein said first and second flat surfaces are on said third portion of said metal shaft, and are thereby hidden by said sleeve after said apparatus has been assembled.
11. The apparatus of claim 9, wherein said first and second flat surfaces are on at least one of said first and second portions, and remain exposed after said apparatus has been assembled.
12. The apparatus of claim 1, wherein said outer surface of said sleeve is non-circular.
13. The apparatus of claim 12, wherein said outer surface of said sleeve comprises at least five flat surfaces.
14. An extender for a buffing pad, comprising: a shaft having first and second ends, one of which is configured to mate with a power tool and the other is configure to mate with said buffing pad, said shaft comprising a first portion extending from said first end, a second portion extending from said second end, and a third portion that is located between said first and second portions, wherein an intersection between said second and third portions of said shaft comprises a lip; a sleeve having an aperture that is configured to slide over said first portion of said shaft and onto said third portion of said shaft, said lip preventing said sleeve from sliding over said second portion of said shaft; and a first clip configured to mate with an intersection between said first and third portion of said shaft, thereby preventing said sleeve from sliding over said first portion of said shaft after said sleeve has been slid onto said third portion of said shaft; thereby allowing a user to prevent rotation of said sleeve while said power tool is being operated, resulting in the rotation of said shaft and said buffing pad.
15. The extender of claim 14, further comprising a second clip configured to mate with said intersection between said second and third portion, said second clip having a circumference that is greater than a circumference of said third portion, thereby defining said lip.
16. The extender of claim 15, wherein said intersection between said first and third portions comprises a first recess, said intersection between said second and third portions comprises a second recess, said first clip is configured to mate with said first recess, and said second clip is configured to mate with said second recess.
17. The extender of claim 14, wherein said first end comprises male threads and said second end comprises female threads.
18. The extender of claim 15, wherein an outer circumference of said first clip and an outer circumference of said second clip is less than an outer circumference of said sleeve.
19. The extender of claim 14, wherein said metal shaft comprises at least a pair of opposed flat surfaces configured to be gripped by a wrench, said pair of opposed flat surfaces being on one of said first and second portions of said shaft.
20. The extender of claim 14, wherein an outer surface of said sleeve is non-circular and configured to be gripped by a hand of a user.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 depicts a prior art buffing pad assembly, where a buffing pad is connected directly to a power tool (e.g., via male and female threads);
[0019] FIGS. 2, 3A, and 3B illustrate an extender in accordance with one embodiment of the present invention that includes a shaft, sleeve, and first and second clips for securing the sleeve onto the shaft;
[0020] FIGS. 4A and 4B show the extender (e.g., as shown in FIG. 2) being used to connect a buffing pad to a power tool, or a rotatable spindle portion thereof;
[0021] FIGS. 5A and 5B illustrate the shaft portion of the extender (see, e.g., FIG. 2) in accordance with one embodiment of the present invention;
[0022] FIG. 6 illustrates the clip portions of the extender (see, e.g., FIG. 2) in accordance with one embodiment of the present invention;
[0023] FIGS. 7A and 7B show the clips illustrated FIG. 6 on the shaft illustrated in FIGS. 5A and 5B;
[0024] FIG. 8 illustrates the sleeve portion of the extender (see, e.g., FIG. 2) in accordance with one embodiment of the present invention;
[0025] FIG. 9 shows the shaft, clip, and sleeve portions of the extender (see FIGS. 5A, 5B, 6, and 8) assembled in accordance with one embodiment of the present invention;
[0026] FIGS. 10A and 10B illustrate a shaft portion in accordance with a first embodiment of the present invention, where opposing flat surfaces (e.g., for a wrench) are at a first end of the shaft;
[0027] FIGS. 11A and 11B illustrate a shaft portion in accordance with a second embodiment of the present invention, where opposing flat surfaces (e.g., for a wrench) are between first and second ends of the shaft;
[0028] FIG. 12 illustrates a retainer portion in accordance with one embodiment of the present invention;
[0029] FIG. 13 illustrates another embodiment of the extender where the sleeve portion has a diameter (or circumference) that is larger than a diameter (or circumference) of the clips, which may rotate during operation of the power tool;
[0030] FIGS. 14A and 14B illustrate a sleeve portion in accordance with one embodiment of the present invention;
[0031] FIGS. 15A, 15B, 15C, and 15D illustrate sleeve portion in accordance with other embodiments of the present invention;
[0032] FIGS. 16A and 16B illustrate a sleeve portion in accordance with yet another embodiment of the present invention, where the outer surface of the sleeve has a texture (e.g., raised bumps, etc.) making it easier to be gripped by a user's hand;
[0033] FIGS. 17A and 17B illustrate a shaft portion in accordance with alternate embodiments of the present invention;
[0034] FIGS. 18A and 18B illustrate a different shaft portion, or first end thereof (e.g., a quick-release connector in both a locked and unlocked position) for mating the extender with a buffing pad and/or power tool;
[0035] FIGS. 19A and 19B show an extender in accordance with another embodiment of the present invention being used to connect a buffing pad to a power tool, or a rotatable spindle portion thereof; and
[0036] FIG. 20 shows an extender in accordance with yet another embodiment of the present invention being used.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0037] The present invention provides an extender that includes a rotating portion, allowing for rotational power to be transferred from a power tool to a buffing pad, and a non-rotating portion that can be held by a user to support, direct, and/or control the buffing pad during operation of the power tool. This invention addresses problems found in traditional extenders, which include, but are not limited to, operator fatigue and uneven application of a buffing compound. In the detailed description that follows, like element numerals are used to describe like elements shown in one or more of the figures.
[0038] FIG. 1 provides an exploded view of a prior art buffing pad assembly comprising a power buffer and a buffing pad. The power buffer includes a handle that is carried by an operator and used to hold the buffing pad in relation to a surface. The body of the power buffer includes a motor that rotatably drives a spindle (e.g., with male threads). The power buffer will typically include a trigger switch that enables the operator to control the speed of operation of the motor. The buffing pad is attached to the spindle via a connector (e.g., with female threads). The power buffer motor spins the attached buffing pad at a very high speed in varying motions, such as circular, orbital or both, in order to get optimal polishing or refinishing effects. The male/female threads allow the operator to release (or remove) the buffing pad from the power buffer to either replace or flip to the opposite side (i.e., if it is a dual-sided buffing pad).
[0039] As discussed above, it would be advantageous to have an extender that displaces the buffing pad from the power buffer (e.g., by a predetermined length) while overcoming drawbacks associated with traditional extenders. With that being said, it should be appreciated that the present invention is not limited to such use (e.g., with power buffers and buffing pads), and may also (or alternatively) be used with other types of rotational power tools and all single-sided and dual-sided buffing, polishing and abrasive (e.g., metal, stone, ceramic, fiber, sand, nylon, polypropylene, etc.) pads, including brush pad assemblies, generally known to those skilled in the art.
[0040] Those skilled in the art will understand that buffing pads are usually circular in shape and can be made of varying materials depending upon the needs of the operator and the finishing effect desired. The invention will work equally with all types of buffing pads, including those made of fibers, such as natural wool, synthetic fibers, a blend of the two, and with open or closed cell foam. It will also work with other types of pads, include nylon brush pads and other buffing, polishing, and/or abrasive (e.g., metal, stone, ceramic, fiber (woven and non-woven), sand, nylon, polypropylene, etc.) pads generally known to those skilled in the art. While embodiments of the present invention are described below in terms of a power tool and a single-sided buffing pad, it is only being described as such for the sake of brevity.
[0041] As shown in FIGS. 2 and 3A-B, an extender 10 in accordance with one embodiment of the present invention may include a shaft (e.g., constructed from plastic, wood, metal (e.g., aluminum, steel, iron, etc.), etc.), a sleeve (e.g., constructed from metal, wood, plastic (e.g., polyethylene, polypropylene, polycarbonate, etc.), etc.), and at least one retainer (120, 130) (e.g., constructed from metal, plastic, etc.). In a preferred embodiment, the retainer (120, 130) is a C-clip. With that said, other retaining rings and/or structures generally known to those skilled in the art are within the spirit and scope of the present invention. The purpose of the retainers (120, 130) is to fix the sleeve 110 (longitudinally) on the shaft 100, so that it does not interfere with rotational operation of the buffing pad and/or power tool. As shown in FIGS. 3A-B, the shaft 100 includes a first end 102 and a second end 104, where the first end 102 includes a plurality of female threads and is configured to mate with a power tool and the second end 104 includes a plurality of male threads and is configured to mate with a buffing pad. It should be appreciated that other embodiments are within the spirit and scope of the present invention. For example, the first end 102 may have male threads, a quick release connector, etc., and the second end 104 may have female threads, a quick release connector, etc., depending on the devices (e.g., buffing pad, power tool, etc.) that are to be connected to the extender and their respective connectors. Thus, an extender that includes a quick-release connector at one end and male threads at the other, male threads at both ends, female threads at both ends, etc., is within the spirit and scope of the present invention.
[0042] As shown in FIGS. 4A-B, the extender 10 is preferably configured to be placed between (mated with) a power tool 20 and a buffing pad 30, the assembly of which creates a buffing pad assembly 40. The extender 10 should preferably include a first portion that is rotatable, thereby allowing transfer of rotational power from the power tool 20 to the buffing pad 30, and a second portion that is non-rotatable, or can be gripped by a user's hand 50 to prevent its rotation during operation of the power tool. These portions will now be discussed in greater detail.
[0043] As shown in FIGS. 5A-B, the shaft 100 may include a first portion (A) near (or adjacent) the first end 102, a second portion (C) near (or adjacent) the second end 104, and a third portion (B) located therebetween, where the third portion (B) is where the sleeve will ultimately reside (at least in a preferred embodiment). This portion 104 is preferably circular (at least substantially) and is bound by two retainers. In one embodiment, the shaft 100 includes two grooves (or recesses) (106, 108) that are configured to receive corresponding retainers (e.g., C-clips) (see, e.g., FIG. 6). For example, as shown in FIG. 7A, a first C-clip 120 may be mated with (e.g., snapped over) a corresponding groove 108 on the shaft 100, or, as shown in FIG. 7B, a second C-clip 130 may be mated with (e.g., snapped over) a corresponding groove 106 on the shaft 100. The sleeve 110 (see FIG. 8) can then be slid over the first (A) or third (C) portion of the sleeve (depending on which end is open), and onto the second (B) portion, where the sleeve 110 will reside. The other C-clip can then be attached, resulting in a fully assembled extender 10 (see FIG. 9). It should be appreciated that the present invention is not limited to this embodiment (e.g., one that requires grooves, C-clips, etc.), and other embodiments are within the spirit and scope of the present invention.
[0044] In one embodiment of the present invention, the shaft further comprises opposing flat surfaces (e.g., surfaces that are parallel to one another) that can be gripped (e.g., with a wrench) when mating the extender with (or removing it from) the power tool or buffing pad. For example, while a user may be able (e.g., with their hands) to begin threading the extender onto male/female threads of the buffing pad and male/female threads of the power tool, a wrench may be need to complete the threading (e.g., to ensure snug, secure connections). In one embodiment, the flat surfaces 700 are on the second portion (B) of the shaft 100 (see FIG. 11A). A drawback of this embodiment is that the sleeve, upon final assembly, may cover (or hide) the flat surfaces 700.
[0045] For example, as shown in FIG. 11A (end view shown in FIG. 11B), the sleeve may be configured (e.g., size wise) to reside between grooves 106 and 108 and secured in place by corresponding C-clips (see, e.g., FIG. 12). This would render the flat surfaces 700 inaccessible, at least once the sleeve is secured in place. In certain situations, this may be acceptable. For example, in situations where the wrench is only used to secure the extender to the buffing pad, the sleeve can be placed over the flat surfaces 700 after the extender is connected to the buffing pad, but before it is connected to the power tool. Vice versa, this would also work in situations where the wrench is only needed to secure the extender to the power tool.
[0046] If, however, the flat surfaces 700 are required to secure the extender to both the buffing pad and the power tool, or it is desirous to fully assemble the extender before it is connected to either the buffing pad or power tool, the flat surfaces could be located on the first or third portions (A, C) (see FIG. 10A) (end view shown in FIG. 10B). Alternatively, the sleeve could be shortened, so that it is shorter than the second portion (B) of the shaft 100. For example, as shown in FIG. 11A, the sleeve could be configured to reside between grooves 108 and 1100. Depending on design constraints, alternate locations for the flat surfaces and/or sleeve are within the spirit and scope of the present invention.
[0047] As discussed above, the outer surface of the sleeve 110 is configured to be gripped by the user's hand. Thus, as shown in FIG. 13, it is preferred that its circumference (i.e., the outer circumference of 110) is greater than the circumference of the retainers (i.e., the outer circumference of 120, 130). This is because the retainers (along with the shaft) may rotate when the power tool is operated, whereas the sleeve should not (at least when it is secured by the user). Thus, to prevent the user's hand from contacting (or being injured by) the retainers 120, 130, their outer circumferences (or diameters) should preferably be less than the outer circumference (or diameter) of the sleeve 110. And in preferred embodiments, the outer circumference (or diameter) of the shaft (at least at portions A and C) should be less than the outer circumferences (or diameters) of the retainers 120, 130.
[0048] As shown in FIGS. 14A-B (A being an end view, and B being a side view), the inside (or aperture) 1402 of the sleeve 110 is preferable circular, with a diameter (or inner circumference 1404) that is slightly larger than the diameter (or outer circumference) of the shaft 100 (at least at portion B). This will allow the sleeve 110 to held by the user during rotation of the shaft 100. As such, the outer surface 1400 of the sleeve 110 should be designed so that it can easily be gripped by the user. For example, the outer surface 1400 may be non-circular, or include a plurality of flat surfaces. This should make it easier for the user to prevent rotation of the sleeve during operation of the power tool.
[0049] It should be appreciated that the outer surface of the sleeve is not limited to the shape depicted in FIG. 14A, and other shapes are within the spirit and scope of the present invention. For example, the outer surface could include fewer or greater flat surfaces (see, e.g., FIGS. 15A-D) or could be substantially circular (see, e.g., FIG. 16A). The outer surface may also include a texture or coating 1600 (see FIG. 16B) (e.g., a plurality of bumps, raised/recessed portions, rubber, tape, etc.) that would make it easier for the user to grip (e.g., increasing the outer surface's frictional coefficient, as opposed to the inner surface, where friction between the sleeve and the shaft should be minimized or reduced). Obviously, other methods of reducing and/or increasing friction generally known to those skilled in the art may also (or alternatively) be used and are therefore within the spirit and scope of the present invention.
[0050] As discussed above, the present invention is not limited to the foregoing embodiments. For example, as shown in FIG. 17A, the shaft could be machined at a first end (or a second end, see FIG. 17B) to include a portion 1700 that has a greater circumference (or diameter) than the second portion (B) of the shaft, thereby creating a lip (or shoulder) that can function as a retainer for the sleeve. In other words, in accordance with this embodiment, the sleeve could be slid onto the second portion (B) of the shaft until it contacts (e.g., rests against) the lip/shoulder. A retainer (e.g., C-clip) could then be attached to the shaft, thereby securing the sleeve between the retainer (e.g., C-clip) and the lip/shoulder. Other known methods of retaining the sleeve on the shaft (e.g., other retaining rings, clamps, etc.) are within the spirit and scope of the present invention. However, it is preferred that at least one of the retainers is removable so that the sleeve can be placed on (and removed from) the shaft.
[0051] By way of another example, as discussed above, other known connection methods may be used to connect the extender to the buffing pad and/or power tool. For example, one end of the shaft may include a quick release connector 1800, like the one shown in FIGS. 18A-B. Such a connector may include a non-circular head (e.g., square, hexagonal, etc.), at least one spring-loaded ball bearing 1802, a locking means 1804 (circular or square metal portion that can move in a longitudinal direction) (e.g., within an inner cavity), and a spring-loaded sleeve 1806, where the locking means 1804 is connected to the sleeve 1806.
[0052] When the sleeve 1806 is in a forward (e.g., biased) position (see FIG. 18A), the locking means 1804 is moved forward within the cavity, thereby preventing the ball bearings 1802 from moving inward (e.g., into the cavity). Locking the ball bearings 1802 in this position should prevent removal of the extender from the buffing pad or power tool. Once the sleeve 1806, and therefore the locking means 1804, is pulled back (see FIG. 18B), the cavity is then configured to receive the ball bearings 1802, thereby allowing the extender to be removed from the buffing pad or power tool. It should be appreciated that while certain types of connectors have been described (e.g., male threads, female threads, and a quick-release connector), the present invention is not so limited, and can be configured to work with other types of connectors generally known to those skilled in the art.
[0053] In alternate embodiments, the sleeve may include a handle (or the like) for controlling the pad and/or preventing the sleeve from rotating along with the buffing pad. By way of example, this can be seen in FIGS. 19A and B, where the extender 10 is preferably configured to be placed between (mated with) a power tool 20 and a buffing pad 30, the assembly of which creates an alternate buffing pad assembly 40. The extender 10 should preferably include a first portion that is rotatable, thereby allowing transfer of rotational power from the power tool 20 to the buffing pad 30, and a second portion that is non-rotatable, or can be gripped by a user's hand 50 to prevent its rotation during operation of the power tool. This non-rotatable portion may further include a handle 1902 extending therefrom, which may provide a way that the user can not only prevent the extender 10 (or a portion thereof) from rotating during use.
[0054] And to prevent the handle 1902 from rotating during use (e.g., when not being gripped or controlled by the user), the handle may further include a extender 1904 that will come into contact with the power tool 20 (or portion thereof), to prevent the handle 1902 from spinning (out of control, potentially damaging (or injuring) the vehicle, user, etc.). The prevention is accomplished by configuring the handle to come into contact with the power tool 20 (or portion thereof) during use. As shown in FIG. 19B, this can also be accomplished by using an extender 1906, which preferably extends from the handle 1902 perpendicularly, that is configured to connect to the power 20 (or portion thereof). The connection mechanism between the handle 1902 and the power tool 20 is open to designs that are generally known to those skilled in the art, as long as the handle 1902 is locked into place (e.g., prevented from swinging) during use of the power tool 20.
[0055] It should be appreciated that the present invention is not limited to the embodiments shown in FIGS. 19A or B and may include any situation where the handle 2000 extends, preferably perpendicularly, from the sleeve. The handle 2000 may include “scalloped” edges, making it easier to grip, and should preferably be as close to the buffing pad as possible, allowing the user to control movement and use of the buffing pad while in use.
[0056] Having thus described a preferred embodiment of an extender for a buffing pad assembly, it should be apparent to those skilled in the art that certain advantages have been achieved. It should also be appreciated that various modifications, adaptations, and alternative embodiments thereof may be made within the scope and spirit of the present invention. The invention is further defined by the following claims.
