US3747280A - Portable power tool with orbital work-engaging means - Google Patents

Portable power tool with orbital work-engaging means Download PDF

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Publication number
US3747280A
US3747280A US00167746A US3747280DA US3747280A US 3747280 A US3747280 A US 3747280A US 00167746 A US00167746 A US 00167746A US 3747280D A US3747280D A US 3747280DA US 3747280 A US3747280 A US 3747280A
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US
United States
Prior art keywords
pad
housing
coupling portions
combination
outline
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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
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US00167746A
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English (en)
Inventor
R Stroezel
H Lederer
K Bartholoma
R Hahner
E Vogel
A Hettich
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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    • 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

  • the tool is directly connected to the housing by several elastic columns whose end portions are fitted into sockets of or receive projections provided on the tool and on' the housing.
  • the tool is connected with an eccentric ring on the output member of the transmission by means of a single fastener so that it can be detached from the housing as soon as the fastener is removed.
  • the present invention relates to power operated machines in general, and more particularly to improvements in portable power tools. Still more particularly, the invention relates to improvements in portable power operated machines of the type wherein a grinding, sanding, polishing, buffing or like work-engaging member (hereinafter called pad) is caused to oscillate in a predeterminedplane with reference to the housing which accommodates the motor.
  • pad work-engaging member
  • a drawback of thejust described coupling members is that the bonding of their ends to metallic parts consumes much time and must be carried out by skilled persons and by resorting to complicated machinery. Furthermore, the metallic parts reduce the effective length of elastic coupling members so that, in order to insure a certain freedom of movement of the pad with reference to the housing, the machine must employ relatively long coupling members with attendant increase in bulk and weight. Also, the useful life of the bonds between elastic couping members and the metallic parts is relatively short because the bonds are subjected to extremely high stresses when the machine is in operation and are likely to break after relatively short periods of use. This holds true regardless of whether the metallic parts are inserted into or surround the end portions of elastic coupling members.
  • a further drawback of the just described coupling members is that, in order to detach the pad from the housing of the machine, an operator must disconnect each and every metallic part from the housing or from the pad.
  • the connections between such metallic parts and the housing and pad are normally established by means of screws so that each detachment and each reattachment of the pad takes up a substantial amount of time.
  • An object of the invention is to provide a novel and improved connection between the housing of a portable power operated machine, such as a grinding or sanding machine, and a pad which is arranged to orbit with reference to the housing.
  • Another object of the invention is to provide between the housing of the machine and the pad a connection which can be established or terminated without resorting to any tools and which can stand much longer periods of use than the connections in presently known power operated machines of such character.
  • a further object of the invention is to provide novel and improved separable connections between elastic coupling members and a plate-like orbital pad on the one hand and the housing of a portable grinding, sanding, polishing or like machine on the other hand.
  • An additional object of the invention is to provide a portable power operated grinding, sanding, polishing or like machine which can be assembled and taken apart with little loss in time and wherein the elastomeric coupling members between the pad and the housing need not be provided with any bonded metallic parts.
  • the invention is embodied in a power operated machine, particularly in a portable grinding or polishing machine, which comprises a housing, a motor mounted in the housing, a pad which is movable with reference to the housing, motion transmitting means connecting the motor with the pad so as to impart to the pad an or bital movement with reference to the housing, and a plurality of elongated elastic coupling members each directly connecting the pad with the housing so as to undergo deformation in response to movement of the pad with reference to the housing.
  • the coupling members are preferably columns consisting of rubber or elastomeric synthetic plastic material and having end portions which are directly but preferably readily separably connected to suitable male or female portions of the housing and pad.
  • the connection between the motion transmitting means and the pad preferably comprises a single fastener so that the pad can be detached in immediate response to removal of such single fastener. This is due to the fact that the coupling members need not be connected to the housing and/or to the pad by screws or the like but are merely slipped onto suitable projections or inserted into suitable sockets provided on the housing and on the pad. Thus, the coupling members can be held in mere frictional engagement with the housing aswell as with the pad.
  • FIG. 1 is a central longitudinal vertical sectional view of a portable power operated sanding, grinding or polishing machine which embodies the invention
  • FIG. 2 is a rear end elevational view of the machine as seen from the right-hand side of FIG. 1;
  • FIG. 3 is a fragmentary sectional view of a modified machine.
  • FIGS. l and 2 there is shown a portable power-operated sanding, grinding or polishing machine (hereinafter called grinding machine) which comprises a housing having two mirror symmetrical sections or shells I, 2 made of a metallic or synthetic plastic material.
  • the housing further comprises a hollow handle 3 which preferably consists of two sections each forming part of one of the shells l, 2.
  • the sections '1, 2 of the housing and those portions of the sections 1, 2 which define the handle 3 are separably connected to each other by several screws or bolts 3.
  • the rear end portion of the handle 3 has an opening for a protecting sheath 5 surrounding an electric cable or cord 4 having at its free end a plug (not shown) which is isertable into a customary wall outlet.
  • the cable 4 is secured to the handle 3 by a clamp 6.
  • the conductors 4a of the cable are connected with the contacts of an electric switch 7 which is mounted in the handle 3 and has a readily accessible actuating member 8.
  • the connection between a universal electric motor 11 and the switch 7 comprises an antiinterference capacitor 9.
  • the motor 11 is mounted in the main portion of the housing 1, 2 and has a downwardly extending shaft 10.
  • the collector 12 and the carbon brushes 13, 14 of the motor 11 are accessible upon removal of a brush holder cover 15 which separably is secured to the housing.
  • the lower part of the motor shaft 10 is mounted in an antifriction bearing 16 located below a cooling fan 17 which is secured to the shaft 10 and causes currents of air to circulate in the housing and through ventilating openings 18.
  • the lower end portion of the motor shaft 10 carries a pinion 19 which forms part of a motion transmitting connection or transmission between the motor 11 and a plate-like work'engaging member or tool 27 which is adjacent to the lower end portion of the housing.
  • the pinion 19 preferably comprises a metallic hub and a ring-shaped portion provided with teeth and consisting of a textile material permeated with a resinous substance.
  • the transmission further comprises a gear 20 which meshes with the pinion 19 on the shaft 10 and has a metallic hub 21 surrounded by a ring provided with teeth and preferably made in the same way as the ring of the pinion 19.
  • the hub 21 is rotatably mounted on an antifriction bearing 22 which surrounds a post 23 fixedly mounted in the housing of the machine.
  • the hub 21 constitutes a rotary motion transmitting member of the transmission and has an eccentric circular recess located at a level below the antifriction bearing 22 and receiving a further antifriction bearing 24 surrounding an eccentric cylinder 25 which is secured to a plate like pad 27 by a single screw 26 or an analogous fastener so that the axis of the hub 21 is normal to the plane of the pad.
  • the latter carries a workengaging sheet 28 which consists of leather, felt or other suitable sanding, grinding or polishing material.
  • the pad 27 preferably consists of sheet steel and its upper side is provided with four projections 29 registering with similar projections 30 at the undersides of the housing sections 1, 2.
  • the projections 29 are preferably welded to the upper side of the pad 27 and the projections 30 can constitute integral parts of the respective sections 1, 2.
  • the means for connecting the pad 27 with the housing sections 1, 2 comprises four elongated coupling members or columns 31 consisting of rubber or elastomeric synthetic plastic material and having in their end portions recesses which receive the adjacent projections 29 and 30 so that each coupling member 31 is directly connected with the housing as well as with the pad 27 in such a way that the connections can be terminated as soon as the fastener 26 is removed to permit the pad 27 to move away from the housing.
  • the projections 29, 30 are of other than circular outline, preferably of polygonal and most preferably of rectangular or square cross-sectional outline.
  • the recesses at the ends of the coupling members 31 have a similar cross-sectional outline so that the coupling members 31 cannot rotate with reference to the respective projections 29 and 30 when the pad 27 orbits in its own plane in response to rotation of the hub 21 with reference to the eccentric cylinder 25.
  • the coupling members 31 are preferably provided with cylindrical external surfaces. As shown in FIG. 1, the re Bocs in the coupling members 31 can form the end portions of through holes 3111. Owing to such configuration of the members 31, they can be obtained by severing at regular intervals a continuously extruded tube of elastomeric material.
  • the cost of the members 31 is but a fraction of the cost of connections which are used in presently known sanding, grinding or polishing machines with orbiting plate-like pads. Also, the useful life of the members 31 is longer because they need not be positively secured to the projections 29 and 30 so that they are less likely to undergo excessive stresses in response to oscillation of the pad 27 with reference to the housing. Thus, each member 31 can undergo deformation along its full length which contributes to compactness of the machine because the pad 27 can be placed rather close to the adjacent portion of the housing.
  • the detachment of the pad 27 from the housing for the purposes of inspection or replacement takes up very little time because the elastic coupling members 31 are not positively connected to the projections 29 and 30.
  • the pad 37 can be detached upon removal of the fastener 26 and a fresh pad can be attached to the eccentric cylinder 25 with little loss in time.
  • Such convenient removability of the pad 27 enables the user or operator to frequently inspect the condition of coupling members 31 with little loss in time and to rapidly replace a defective coupling member when necessary.
  • the projections 29, 30 are of other than circular cross-sectional outline and extend into similarly configurated portions of holes 310 in the members 31, the coupling members cannot rotate on the respective projections when the pad 27 is caused to orbit with reference to the housing. This reduces the likelihood of wear upon the coupling members 31.
  • FIG. 3 illustrates a portion of a modified grinding or sanding machine having elastomeric coupling members or columns 131 (only one shown) which include end portions extending into sockets 129, respectively provided on the plate-like pad 127 and on the housing sections (only the section 101 shown).
  • the sockets 129, 130 have polygonal (preferably square or rectangular) recesses and the end portions of the coupling members 131 have a similar cross-sectional outline so that the coupling members cannot turn when the pad 127 and its sheet 128 are caused to orbit with reference to the housing.
  • the median portions of the coupling members 131 can be provided with cylindrical peripheral surfaces.
  • the illustrated coupling member 131 can form a section of a continuously extruded elastomeric body which is severed at regular intervals to yield coupling members of desired length.
  • a combination comprising, a housing; a motor mounted in said housing; a pad spaced from and movable with reference to said housing; motion transmitting means connecting said motor with said pad so as to impart to said pad an orbital movement; a plurality of elastic columns extending between said housing and said pad; a first plurality of coupling portions, having each an outline other than a circular outline, respectively provided on opposite ends of each of said elastic columns; and a second plurality of coupling portions, having each an outline matching that of a corresponding one of said first coupling por tions, on said housing and said pad and respectively engaged with said first coupling portions, one of said plurality of coupling portions being female coupling portions and the other of said plurality of coupling portions being male coupling portions respectively engaged in said female coupling portions.
  • said motion transmitting means comprises a member rotatably and axially immovably mounted in said housing, and including fastener means removably securing sad pad to said member, said first and second coupling portions being merely in frictional engagement with'each other to thus facilitate replacement of said columns after removal of said pad.
  • each of said coupling portions has a polygonal outline.
  • each of said recesses and each of said projections has a polygonal cross-sectional outline.
  • said motion transmitting means comprises a rotary member, an eccentric rotatably mounted on said rotary member and fastener means securing said pad to said eccentric so that said pad orbits in a plane which is normal to the axis of said rotary member when the latter is rotated by said motor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US00167746A 1970-08-08 1971-07-30 Portable power tool with orbital work-engaging means Expired - Lifetime US3747280A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702039480 DE2039480A1 (de) 1970-08-08 1970-08-08 Schwingschleifer

Publications (1)

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US3747280A true US3747280A (en) 1973-07-24

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Application Number Title Priority Date Filing Date
US00167746A Expired - Lifetime US3747280A (en) 1970-08-08 1971-07-30 Portable power tool with orbital work-engaging means

Country Status (6)

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US (1) US3747280A (enExample)
CH (1) CH524433A (enExample)
DE (1) DE2039480A1 (enExample)
FR (1) FR2104073A5 (enExample)
GB (1) GB1354596A (enExample)
NL (1) NL7110872A (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849943A (en) * 1973-02-26 1974-11-26 Rockwell International Corp Power operated sanding machine
US3862520A (en) * 1974-02-14 1975-01-28 Singer Co Support assembly for a portable surface-treating machine
US4854085A (en) * 1987-09-24 1989-08-08 Dynabrade, Inc. Random orbital sander
US5518441A (en) * 1993-07-30 1996-05-21 Valentini; Guido Device for manual assembly and removal of working discs in manual tools for machining surfaces
AU686395B2 (en) * 1994-07-26 1998-02-05 Black & Decker Incorporated Improved oscillating hand tool
US20060021775A1 (en) * 2004-07-29 2006-02-02 Achim Duesselberg Power tool with internal fastening element
WO2014023229A1 (zh) * 2012-08-07 2014-02-13 苏州宝时得电动工具有限公司 磨削动力工具

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS607953U (ja) * 1983-06-27 1985-01-19 リョービ株式会社 研摩機の集塵装置
DE3514560A1 (de) * 1985-04-23 1986-10-23 Festo KG, 7300 Esslingen Schwingschleifer
GB9426259D0 (en) * 1994-12-24 1995-02-22 Black & Decker Inc Improved oscillating hand tool

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1085718A (fr) * 1953-10-28 1955-02-07 Peugeot & Cie Machine à mouvement rotatif de faible amplitude commandé par excentrique
AT184475B (de) * 1953-03-27 1956-01-25 Festo Maschf Stoll G Elektromotorisch angetriebener Vibrationsschleifer, insbesondere für die Holzbearbeitung
US3345784A (en) * 1964-12-29 1967-10-10 Rockwell Mfg Co Orbital finishing sander

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT184475B (de) * 1953-03-27 1956-01-25 Festo Maschf Stoll G Elektromotorisch angetriebener Vibrationsschleifer, insbesondere für die Holzbearbeitung
FR1085718A (fr) * 1953-10-28 1955-02-07 Peugeot & Cie Machine à mouvement rotatif de faible amplitude commandé par excentrique
US3345784A (en) * 1964-12-29 1967-10-10 Rockwell Mfg Co Orbital finishing sander

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849943A (en) * 1973-02-26 1974-11-26 Rockwell International Corp Power operated sanding machine
US3862520A (en) * 1974-02-14 1975-01-28 Singer Co Support assembly for a portable surface-treating machine
US4854085A (en) * 1987-09-24 1989-08-08 Dynabrade, Inc. Random orbital sander
US5518441A (en) * 1993-07-30 1996-05-21 Valentini; Guido Device for manual assembly and removal of working discs in manual tools for machining surfaces
AU686395B2 (en) * 1994-07-26 1998-02-05 Black & Decker Incorporated Improved oscillating hand tool
US6132300A (en) * 1994-07-26 2000-10-17 Black & Decker Inc. Dual function oscillating tool
US20060021775A1 (en) * 2004-07-29 2006-02-02 Achim Duesselberg Power tool with internal fastening element
US7348485B2 (en) * 2004-07-29 2008-03-25 Robert Bosch Gmbh Power tool with internal fastening element
WO2014023229A1 (zh) * 2012-08-07 2014-02-13 苏州宝时得电动工具有限公司 磨削动力工具

Also Published As

Publication number Publication date
DE2039480A1 (de) 1972-02-10
NL7110872A (enExample) 1972-02-10
GB1354596A (en) 1974-06-05
CH524433A (de) 1972-06-30
FR2104073A5 (enExample) 1972-04-14

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