US3793776A - Double insulated portable sander - Google Patents

Double insulated portable sander Download PDF

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Publication number
US3793776A
US3793776A US00273878A US3793776DA US3793776A US 3793776 A US3793776 A US 3793776A US 00273878 A US00273878 A US 00273878A US 3793776D A US3793776D A US 3793776DA US 3793776 A US3793776 A US 3793776A
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US
United States
Prior art keywords
base plate
counterbalance
bearing
hub
free end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00273878A
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English (en)
Inventor
R Hurn
P Sadow
G Baum
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Black and Decker Corp
Original Assignee
Black and Decker Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Black and Decker Manufacturing Co filed Critical Black and Decker Manufacturing Co
Application granted granted Critical
Publication of US3793776A publication Critical patent/US3793776A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor

Definitions

  • m n m n; m mmumm m t i i a i nsr P b r .mfi m ho m, 0 e P e u i fc w P 2.
  • e m n .mmmk gb me fa w w oeg h HO W na fl .1 0 m m n ousing is formed of insulatin of the motor shaft being con ing sleeve drivably connected with the conventional counterbalance, together with a base plate of insulating material which is provided with a central 0 for receiving a bearing having its outer race into a bore in the base plate and-having its in pressed on to a hub of the counterbalance, the central opening in the plate being sealed by a ca material thus sealing the lubricant in the ing and preventing access to the bea from the bottom of the tool to achieve tion, the wear inhibiting
  • Another object of the invention is to provide in a tool of the above type a novel arrangement wherein the oscillating base plate is formed of insulating material and the bearing interconnecting the drive shaft and plate is assembled through an opening in the plate which, after assembly, is sealed with a cap of insulating material to provide the seal and insulating features referred to above.
  • a further object includes the use of a novel sleeve of wear inhibiting material for drivably connecting the motor shaft with the counterbalance, such an arrangement providing a wear-inhibiting and highly efficient driving connection between the shaft and the oscillating base plate.
  • Still another object is to provide a novel selfcontained, replaceable oscillatable unit comprising the coupling sleeve of insulating material, the counterbalance, the insulated base plate'and the bearing interposed between the counter-balance and the base plate such unit being permanently assembled and readily adapted to be interconnected with the drive shaft and removably bolted to the toolhousing.
  • a still further object is to provide a portable tool of .the above character which may be manufactured'at a relatively low cost but which is highly reliable in operation.
  • FIG. 1 is a perspective view of a portable electrical sanding tool embodying the principles of the present invention
  • FIG. 2 is a side view of the tool of FIG. 1, the lower portion thereof being shown in section,
  • FIG. 3 is an enlarged-sectional view of a the lower part of the tool.
  • FIG. 4 is an enlarged sectional view of the drivable connection between the motor shaft and the counterbalance taken substantially along line 44 of FIG. 3.
  • the construction being such that in the operation of the tool, the base plate 20, platen 22 and the sheet will partake of an orbital motion for use in the sanding of a workpiece.
  • the electric driving motor is supported by a spider 24 having a central bearing part 26 through which a motor shaft 28 extends, the spider being suitably supported between the motor housing 12 and the lower housing member 19, a plurality of bolts, one of which is shown at 30 being provided for interconnecting the parts 14, 12, 24 and 19 in assembled condition.
  • the shaft 28 has a lower end 32 extending past the spider 24 and is drivingly connected to a hub 39 of a counterbalance 40.
  • the hub 39 has an eccentric peripheral surface 41 on which a bearing 50 is disposed, the latter being seated in an opening 51 in the base plate 20.
  • the shaft 28 is constructed of steel, and the counterbalance 40 of aluminum, cast iron, sintered iron, zinc, brass, etc., and to prevent wear between these relatively movable parts, a sleeve 34 is provided therebetween.
  • This sleeve 34 which may be constructed of a suitable wear inhibiting material, such as urethane, and has a splined or fluted bore- 36 slidably receiving the correspondingly fluted shaft end 32.
  • the exterior of the sleeve 34 has a polygonal for-.
  • the sleeve 34 has a flared upper end 43 seated in a flared outer end 45 of bore 38.
  • counterbalance 40 will be rotated by the rotation of the support the base plate 20 for orbital movement, a plurality of sets of flexible or resilient fingers 35, 42, see FIG. 2, are secured to the housing member 19, the fingers having an apertured base part 44 for receiving a plurality of bolts, one of which is shown at 46.
  • the means for drivably connecting the counterbalance 40 with the base plate 20, shown in FIGS. 2 and 3, includes a conventional bearing having inner and outer races 48 and 50.
  • the base plate 20 has a hub 52 provided with a bore 51 into which the outer race of the bearing 47 is press fitted.
  • the inner bearing race 48 is pressed over the eccentric surface 41 of counterbalance hub 39.
  • a counterbore (thereby extending the life of bearing 47), but also prevents access to the bearing 47 and other live conductive parts.
  • the sleeve 34, counterbalance 40, bearing 47, and the insulated base plate are permanently assembled, and constitute a selfcontained unit or sub-assembly which is removably secured 46 to the housing member 19 through the bolts 46 and flexible fingers 41 and 42.
  • Such unit may be readily replaced at any time should this be necessary in servicing the tool. This is advantageous in that it makes replacement of worn parts, usually the bearing 47, virtually foolproof even for the most inexperineced user.
  • the present invention provides a novel portable electric sanding tool wherein the housing structure including the base plate 20 is formed of insulating material and the bearing 47 and other conductive parts are inaccessible, in order to achieve double insulation.
  • the use of the wear inhibiting sleeve 34 for interconnecting the shaft end 32 and the counterbalance 40 provides a durable wear member capable of long life, while the permanently assembled bearing, counterbalance, and base plate together with the sealing cap, provides an extremely easy and safe method of replacing these parts while permanently sealing the bearing for long life.
  • Such an arrangement also insures that no metal parts are accessible to the operator, thus assuring a portable electric tool having double insulation and therefore dispensing with the necessity of utilizing the conventional ground wire.
  • a portable electric sanding tool of the type having a housing formed of insulating material, a rotatable shaft journalled therein and having a free end adapted to be connected to a base plate for oscillating the latter, the base plate being resiliently mounted to the housing, the invention which comprises means for drivably connecting said free end and base plate including a counraces on both of said hubs, and defining a lubricant cav-- ity, and a cap of insulating material closing said opening and sealed to said base plate.
  • a portable electric sanding tool of the type having a housing formed of insulating material, a rotatable shaft journalled therein and having a free end adapted to be connected to a base plate for oscillating the latter, resilient means interconnecting the base plate to the housing
  • the invention which comprises means for drivably connecting said free end of said shaft and said base plate including a wear inhibiting coupling sleeve provided with a non-circular bore slidably and nonrotatably receiving said shaft free end, said sleeve having a non-circular outer surface, a counterbalance nonrotatably connected to said outer surface for conjoint rotation with said shaft free end and said sleeve, a hub formed on said counterbalance, a hub formed on said base plate, and a bearing interconnecting said hubs, said bearing having an-outer race pressed in the second-named hub and an inner race pressed on the first named hub.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US00273878A 1972-07-21 1972-07-21 Double insulated portable sander Expired - Lifetime US3793776A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27387872A 1972-07-21 1972-07-21

Publications (1)

Publication Number Publication Date
US3793776A true US3793776A (en) 1974-02-26

Family

ID=23045795

Family Applications (1)

Application Number Title Priority Date Filing Date
US00273878A Expired - Lifetime US3793776A (en) 1972-07-21 1972-07-21 Double insulated portable sander

Country Status (6)

Country Link
US (1) US3793776A (2)
AU (1) AU465228B2 (2)
CA (1) CA964068A (2)
FR (1) FR2194141A5 (2)
GB (1) GB1381080A (2)
IT (1) IT981726B (2)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095375A (en) * 1977-03-16 1978-06-20 The Singer Company Support assembly for a portable surface-treating machine
US4188682A (en) * 1978-04-28 1980-02-19 Burglin Robert E Automobile cleaning and waxing tool
US4625462A (en) * 1984-08-29 1986-12-02 Makita Electric Works, Ltd. Cordless electric finishing sander
US4791694A (en) * 1987-05-22 1988-12-20 Waxing Corporation Of America, Inc. Cleaning and waxing tool for automobiles, vans, etc.
US5355542A (en) * 1992-11-12 1994-10-18 Oreck Corporation Orbiter floor machine
USD470278S1 (en) 2002-03-01 2003-02-11 Hong Liang-Ming Waxing and polishing device
US20100048109A1 (en) * 2008-08-20 2010-02-25 King Wade C Sander having removable platen
CN102001034A (zh) * 2010-09-20 2011-04-06 铁鎯电动工具有限公司 正反转抛光机
US8398457B2 (en) 2008-08-20 2013-03-19 Black & Decker Inc. Multi-sander
US20130260653A1 (en) * 2012-03-28 2013-10-03 Hitachi Koki Co., Ltd. Power tool
EP2815843A1 (en) * 2013-06-21 2014-12-24 X'Pole Precision Tools, Inc. Durable sander comprising an oscillation buffer element
US20150014013A1 (en) * 2011-12-23 2015-01-15 Robert Bosch Gmbh Electrically Operable Machine Tool
US9102048B2 (en) 2013-11-29 2015-08-11 Black & Decker Inc. Sander having two-piece fan
US9421682B2 (en) 2011-07-18 2016-08-23 Black & Decker Inc. Multi-head power tool with reverse lock-out capability
US9956677B2 (en) 2013-05-08 2018-05-01 Black & Decker Inc. Power tool with interchangeable power heads

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345784A (en) * 1964-12-29 1967-10-10 Rockwell Mfg Co Orbital finishing sander
US3520090A (en) * 1968-01-29 1970-07-14 Donald Lee Surface finishing machine
US3555743A (en) * 1968-04-15 1971-01-19 Skil Corp Power sander

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345784A (en) * 1964-12-29 1967-10-10 Rockwell Mfg Co Orbital finishing sander
US3520090A (en) * 1968-01-29 1970-07-14 Donald Lee Surface finishing machine
US3555743A (en) * 1968-04-15 1971-01-19 Skil Corp Power sander

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095375A (en) * 1977-03-16 1978-06-20 The Singer Company Support assembly for a portable surface-treating machine
US4188682A (en) * 1978-04-28 1980-02-19 Burglin Robert E Automobile cleaning and waxing tool
US4625462A (en) * 1984-08-29 1986-12-02 Makita Electric Works, Ltd. Cordless electric finishing sander
US4791694A (en) * 1987-05-22 1988-12-20 Waxing Corporation Of America, Inc. Cleaning and waxing tool for automobiles, vans, etc.
US5355542A (en) * 1992-11-12 1994-10-18 Oreck Corporation Orbiter floor machine
USD470278S1 (en) 2002-03-01 2003-02-11 Hong Liang-Ming Waxing and polishing device
US20100048109A1 (en) * 2008-08-20 2010-02-25 King Wade C Sander having removable platen
US7736216B2 (en) 2008-08-20 2010-06-15 Black & Decker Inc. Sander having removable platen
US10906155B2 (en) 2008-08-20 2021-02-02 Black & Decker Inc. Power tool with interchangeable tool head
US8398457B2 (en) 2008-08-20 2013-03-19 Black & Decker Inc. Multi-sander
US8821220B2 (en) 2008-08-20 2014-09-02 Black & Decker Inc. Power tool with interchangeable tool head
US9724799B2 (en) 2008-08-20 2017-08-08 Black & Decker Inc. Power tool with interchangeable tool head
US8613644B2 (en) 2008-08-20 2013-12-24 Black & Decker Inc. Multi-sander
CN102001034B (zh) * 2010-09-20 2013-04-10 铁鎯电动工具有限公司 正反转抛光机
CN102001034A (zh) * 2010-09-20 2011-04-06 铁鎯电动工具有限公司 正反转抛光机
US9421682B2 (en) 2011-07-18 2016-08-23 Black & Decker Inc. Multi-head power tool with reverse lock-out capability
US20150014013A1 (en) * 2011-12-23 2015-01-15 Robert Bosch Gmbh Electrically Operable Machine Tool
US20130260653A1 (en) * 2012-03-28 2013-10-03 Hitachi Koki Co., Ltd. Power tool
US9956677B2 (en) 2013-05-08 2018-05-01 Black & Decker Inc. Power tool with interchangeable power heads
US10661428B2 (en) 2013-05-08 2020-05-26 Black & Decker Inc. Power tool with interchangeable tool heads
EP2815843A1 (en) * 2013-06-21 2014-12-24 X'Pole Precision Tools, Inc. Durable sander comprising an oscillation buffer element
US9102048B2 (en) 2013-11-29 2015-08-11 Black & Decker Inc. Sander having two-piece fan
US9545712B2 (en) 2013-11-29 2017-01-17 Black & Dekcer Inc. Sander having two-piece fan

Also Published As

Publication number Publication date
FR2194141A5 (2) 1974-02-22
CA964068A (en) 1975-03-11
IT981726B (it) 1974-10-10
AU465228B2 (en) 1975-09-18
AU5178573A (en) 1974-08-08
GB1381080A (en) 1975-01-22

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