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US 4,071,981 AGranted
Portable abrading machine with dust collecting system
AssigneeNone recorded
InventorRoy J. Champayne
Life of this patent
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AssigneeNone recorded
InventorRoy J. Champayne
Estimating the term…
An abrading machine in which an abrading shoe and a dust collecting shroud gyrate in unison, there being a hole formed through the shroud and communicating with a stationary cup in all gyrated positions of the shoe and the shroud. When suction is applied to the cup, abrading dust is sucked upwardly around the entire outer periphery of the shoe and passes into the shroud, through the hole, and then into the cup for exhaustion to a dust collecting receptacle.
An abrading machine comprising a hollow case, a rotary motor within said case, an abrading shoe located beneath said case, drive mechanism within said case and connected between said motor and said shoe to cause the latter to move with non-rotary motion relative to said case and said motor, a dust shroud connected to said shoe to move in unison with the shoe, said shroud comprising a top wall located above and spaced upwardly from the top of said shoe and further comprising a skirt depending from said top wall and extending around the outer periphery of said shoe, said skirt being spaced outwardly from the periphery of said shoe whereby abrading dust may pass into said shroud between said skirt and the periphery of said shoe, a hole extending through said top wall of said shroud, a hollow, downwardly opening fitting rigid with and located outside of said case and communicating with said hole, said fitting being sufficiently large to remain in communication with said hole in all positions of said shoe and said shroud, and means on said fitting for receiving a line for creating suction in said fitting and said shroud whereby abrading dust may be sucked into said shroud and passes through said hole and into said fitting and said suction line.
Dependencies are inferred from the claim text.
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Specially designed for portable grinding machines, e.g. hand-guided: with oscillating tools
Machines, devices, or processes for grinding or polishing
Term ended 7 Feb 1995 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to an abrading machine of the type having an abrading shoe which is adapted to move with non-rotary motion relative to a frame unit. An abrading machine of this general type is disclosed in my U.S. Pat. No. 2,751,725.
The invention more particularly relates to an abrading machine having a suction system for collecting the abrading dust created during operation of the machine. Machines having non-rotary abrading shoes and having dust collecting suction systems are disclosed in Hutchins U.S. Pat. Nos. 3,815,292 and Hutchins 3,932,963.
The general aim of the present invention is to provide a non-rotary abrading machine having a dust collecting system which is simpler in construction and more effective in operation than the collecting systems of prior machines.
FIG. 1 is a perspective view of a new and improved abrading machine incorporating the unique features of the present invention.
FIGS. 2 and 3 are fragmentary cross-sections taken substantially along the lines 2--2 and 3--3, respectively, of FIG. 1.
As shown in the drawings for purposes of illustration, the invention is incorporated in a portable abrading machine 10 having a rotary pneumatic motor 11 (FIG. 2) housed within a hollow frame unit or casing 13 on which an abrading shoe 14 is supported for bodily gyration. The frame casing 13 is generally dome shaped and is formed with a rearwardly projecting handle 15 which may be gripped to carry the tool, to guide it along a work surface or to apply the necessary downward pressure on the shoe. An operating lever or trigger 16 is pivotally mounted on the handle and may be depressed to open a valve 17 (FIG. 2) and admit pressurized air to the motor from a flexible line 19 extending into the rear of the handle.
The abrading shoe 14 herein is rectangular in shape and comprises a pad 20 of yieldable material such as rubber which is adhesively secured on its upper side to a metal plate 21. An abrasive sheet 23 is adhesively secured or otherwise suitably attached to the lower side of the pad.
Mechanism 24 (FIG. 2) is housed within the casing 13 for producing gyration of the abrading shoe 14 in response to operation of the motor 11. Such a drive mechanism is well known (see, for example, my aforementioned patent) and thus need not be described in detail here. It will suffice to say that all parts of the shoe gyrate bodily relative to the casing with the radius of gyration usually being about 3/32 of an inch.