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  Belt sanderUSPTO Application #: 20070202782Title: Belt sander Abstract: A belt sander is disclosed that may include a sanding assembly having a first roller and a second roller, the sanding assembly being configured to receive a sanding belt around the first roller and the second roller to define a sanding surface therebetweeen. The belt sander may include a motor operationally coupled to the sanding assembly and opposite the sanding surface, the motor being configured to rotate at least the first roller and thereby rotate the sanding belt around the first roller and the second roller, as well as a handgrip formed around at least a portion of the motor and substantially encasing the motor. (end of abstract) Agent: Brake Hughes Bellermann LLP - Minneapolis, MN, US Inventors: Daniel P. Wall, Craig A. Carroll USPTO Applicaton #: 20070202782 - Class: 451355000 (USPTO) Related Patent Categories: Abrading, Frame Or Mount, Portable Abrader, Endless Band Tool The Patent Description & Claims data below is from USPTO Patent Application 20070202782. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority under 35 U.S.C. 120 to, and is a continuation of, U.S. application Ser. No. 11/334,960, filed Jan. 19, 2006, and titled, "BELT SANDER," which (i) claims priority under 35 U.S.C. 120 to, and is a continuation-in-part of, U.S. application Ser. No. 11/089,447, filed Mar. 24, 2005, and titled, "BELT SANDER," and which (ii) claims priority under 35 U.S.C. 119 to U.S. Provisional Application 60/757,818, filed Jan. 11, 2006, and titled "BELT SANDER." The above-identified applications are incorporated by reference in their entirety. TECHNICAL FIELD [0002] This description relates to belt sanders. BACKGROUND [0003] Woodworkers often wish to smooth a surface of a workpiece prior to the completion of a woodworking project. For example, many workpieces require at least a minimal amount of sanding in order to remove any excess glue or rough edges, prior to completion of the project. Different types of sanders may be used for such sanding, e.g., to improve a surface quality and appearance of the workpiece. For example, such sanders may include a piece of sandpaper held in the woodworker's hand, or may include automated sanders, such as orbital sanders or quarter pad finishing sanders. [0004] A belt sander is another example of a type of sander. Belt sanders generally include some mechanism for maintaining a sanding belt around two rollers. During operation, such belt sanders are designed to provide sufficient tension to the sanding belt to avoid skewing thereof, while avoiding excess tension that may lead to a breaking of the sanding belt. SUMMARY [0005] According to one general aspect, a belt sander includes a sanding assembly having a first roller and a second roller, the sanding assembly being configured to receive a sanding belt around the first roller and the second roller to define a sanding surface therebetweeen. The belt sander also includes a motor operationally coupled to the sanding assembly and opposite the sanding surface, the motor being configured to rotate at least the first roller and thereby rotate the sanding belt around the first roller and the second roller, and a handgrip formed around at least a portion of the motor and substantially encasing the motor. [0006] Implementations may include one or more of the following features. For example, the motor may be oriented in-line with a longitudinal axis along the belt sander and intersecting the first roller and the second roller. A center of gravity of the belt sander may be substantially centered over the sanding assembly. The motor may be included within a three-dimensional area defined by a perimeter of the sanding assembly and extending in a direction of the motor. The motor may include an alternating-current motor. [0007] A gear train coupling the motor to the first roller may be included, the gear train including a cross-axis gearing configured to translate a rotation of a motor shaft of the motor into a rotation of a drive pulley shaft that is perpendicular to the motor shaft and parallel to an axis of the first roller. A platen may be disposed between the first roller and the second roller and between the sanding surface and the motor, and a center of gravity of the belt sander may be substantially centered over the platen. The platen may have a length that is approximately less than 150 mm. [0008] An entry area for a power cord may be included at a rear of the belt sander and contoured for gripping during operation of the belt sander. A detachable auxiliary handle mounted at a front of the belt sander also may be included. [0009] A length of the belt sander may be less than approximately 350 mm. A distance between a first axis of the first roller and a second axis of the second roller may be less than approximately 250 mm. A width of the handgrip may be less than approximately 100 mm. The motor may be configured to provide at least 0.25 hp in driving the sanding belt. The sanding belt may be at least 300 mm in length, and the motor may be configured to drive the sanding belt at a minimum of 600 sfpm. [0010] A tracking mechanism may be included, and the tracking mechanism may include a sidewall of the belt sander, a yoke having a roller mount at a front end that is configured for mounting the front roller of the belt sander, the yoke being supported by the sidewall, a pivot pin mounted between the sidewall and the roller mount, and a tracking shaft extending through the sidewall and positioned to move against the yoke and pivot the yoke about the pivot pin. Additionally, or alternatively, a belt tracking mechanism may be included, the belt tracking mechanism including a frame supporting the second roller as an idle roller, said idle roller having an idle roller axle, said idle roller revolving about said idle roller axle, and a yoke supporting said idle roller axle, said yoke lying substantially orthogonal to said idle roller axis and allowing said idle roller and idle roller axis to freely translate along a longitudinal direction, while constraining said idle roller axis from movement along a vertical direction substantially orthogonal to said longitudinal direction. [0011] A brush mounting system may be included that includes a concave brush card having a first brush box and a second brush box attached proximate a first end and a second end of the brush card, and at least one fastener attaching the brush card around a commutator of the motor of the belt sander with the first brush box and the second brush box positioned to provide contact to corresponding motor brushes and substantially opposing sides of the commutator. [0012] According to another general aspect, a belt sander includes a sanding assembly including a rear roller, a front roller, the sanding assembly being configured to receive and rotate a sanding belt around the rear roller and the front roller during operation of the belt sander. The belt sander includes a motor mounted over the sanding assembly and balanced with respect to the sanding assembly in a direction substantially parallel to an axis of the rear roller, and a handgrip at least partially encasing the motor. [0013] Implementations may include one or more of the following features. For example, the handgrip may substantially encase the motor above the sanding assembly. A lower portion of the handgrip may be at or below a bottom of the motor. A cross-axis gearing may be included that is operably connected to the motor and that may be operable to translate a motion of the motor into a rotation of the rear roller. The motor may include an alternating current motor. [0014] According to another general aspect, a sanding assembly is attached to a gear housing, the sanding assembly being configured to receive a sanding belt and including a rear roller and a front roller. A motor is attached to the gear housing above the sanding assembly, the motor being mounted in-line with an axis that intersects the rear roller and the front roller. A handgrip is attached at least partially encasing the motor. [0015] Implementations may include one or more of the following features. For example, in attaching the handgrip, the handgrip may be attached with a lower portion of the handgrip at or below a bottom of the motor, and/or the handgrip may be attached substantially encasing the motor above the sanding assembly. In attaching the sanding assembly, a tracking box may be attached that may include a tracking mechanism configured to provide a tracking of the sanding belt on the sanding assembly. [0016] According to another general aspect, a belt sander includes a sanding assembly having a first roller and a second roller, the sanding assembly being configured to receive a sanding belt around the first roller and the second roller to define a sanding surface therebetweeen, a motor operationally coupled to the sanding assembly and opposite the sanding surface, the motor being configured to provide at least 0.25 hp to rotate at least the first roller and thereby rotate the sanding belt around the first roller and the second roller, and a handgrip having a width of less than approximately 100 mm. [0017] Implementations may include one or more of the following features. For example, the handgrip may be formed around at least a portion of the motor and substantially encasing the motor. [0018] According to another general aspect, a belt sander includes a sanding assembly having a first roller and a second roller, the sanding assembly being configured to receive a sanding belt around the first roller and the second roller to define a sanding surface therebetweeen, and a motor operationally coupled to the sanding assembly and opposite the sanding surface, the motor being configured to provide at least 0.25 hp to rotate at least the first roller and thereby rotate the sanding belt around the first roller and the second roller, wherein the belt sander has a length of less than approximately 350 mm. [0019] Implementations may include one or more of the following features. For example, the handgrip may be formed around at least a portion of the motor and substantially encasing the motor. [0020] According to another general aspect, a tracking mechanism for a belt sander includes a sidewall of the belt sander, and a yoke having a roller mount at a front end that is configured for mounting a front roller of the belt sander, the yoke being supported by the sidewall. A pivot pin is mounted between the sidewall and the roller mount, and a tracking shaft extends through the sidewall and is positioned to move against the yoke and pivot the yoke about the pivot pin. Continue reading... Full patent description for Belt sander Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Belt sander patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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