EP0719616B1 - Improved oscillating hand tool - Google Patents
Improved oscillating hand tool Download PDFInfo
- Publication number
- EP0719616B1 EP0719616B1 EP19950308370 EP95308370A EP0719616B1 EP 0719616 B1 EP0719616 B1 EP 0719616B1 EP 19950308370 EP19950308370 EP 19950308370 EP 95308370 A EP95308370 A EP 95308370A EP 0719616 B1 EP0719616 B1 EP 0719616B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shoe
- drive shaft
- drive
- face
- location hole
- 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
Links
Images
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
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
- B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
-
- 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 present invention relates to a powered oscillating hand tool, in particular an orbital sander, comprising a drive unit having an electric motor with a drive shaft to which a sanding shoe can be attached, as per the preamble of claim 1.
- a powered oscillating hand tool in particular an orbital sander
- a drive unit having an electric motor with a drive shaft to which a sanding shoe can be attached as per the preamble of claim 1.
- An example of such a tool is disclosed in FR-A-2 104 073.
- the drive system comprises an eccentric which is restrained so that the sander shoe cannot spin independently of the motor and it therefore describes a regular orbit.
- the shoes of such sanders are available in a range of shapes and such sanders are in general used for the removal of relatively small quantities of material, for example for detailed work or for finishing. By choice of a suitably shaped shoe, it is possible to access areas which are inaccessible with a random orbit sander.
- the restraining mechanism by which the eccentric is restrained so that the sander shoe cannot spin independently of the motor and therefore describes a regular orbit generally comprises a co-operating array of legs and spigots on the shoe and the sander body respectively.
- the location hole on the shoe, in which the drive shaft locates it is necessary for the location hole on the shoe, in which the drive shaft locates, to be centrally positioned on the shoe. This leads to difficulties in locating the location hole of the shoe on the second (eccentric) drive shaft at the same time as locating the corresponding legs and spigots.
- For the shaft to match the location hole on the shoe it is necessary to deform the legs during this location.
- sanders have hence been either of the orbital type as described above, with a fixed shoe or of the random orbit type in which a circular platen is driven by a drive system which comprises an eccentric bearing so that the platen can spin independently of the motor, and the platen describes a random orbit.
- the drive shaft to which the sander head is attachable, and the hole by which the head is mounted on the shaft are each of generally circular section, flatted on opposite faces to assist in retaining the head on the sander.
- This design is more expensive to manufacture than a circular section and has the further disadvantage that when the user locates the head on the shaft, it is necessary to align the opposed flats on the shaft and head correctly, in order to avoid damage to the head or the shaft.
- FR-A-2 104 073 discloses an oscillating grinder comprising a housing containing a drive motor and a grinding wheel mounted on the housing by means of a large number of elastic columns, this grinding wheel being adapted to be driven in oscillating movement by the motor and by use of a transmission gear, the grinder being characterised in that the columns are directly engaged in the housing and in the grinding wheel.
- It is an object of the present invention to provide a powered oscillating hand tool comprising a drive unit having an electric motor with a drive shaft to which a sander head can be attached, in which the attachment means by which the sander head is attachable to the drive shaft is particularly convenient.
- the present invention therefore provides a powered oscillating hand tool comprising
- the invention thus provides a powered oscillating power tool which can easily be fitted with an orbital sander shoe or with an alternative sander head, such as a differently shaped sanding shoe or a random orbit sander head without requiring deformation of the restraining legs.
- Figures 1 and 2 show a drive unit (2) including an electric motor (not shown) located in upper housing (4) and driving shaft (6).
- a fan (8) mounted on shaft (6) is arranged to draw air in from mouth (10) of lower housing (12) and direct it through extractor duct (14) to exhaust outlet (16).
- a screw (18) and washer (20) are used to secure a sanding shoe (22) to a second drive shaft (24) which is housed in the fan (8) by bearing (26) which is eccentrically located radially in respect to shaft (8).
- the second drive shaft (24) comprises a first section (28), a flange (30) and a drive spigot (32).
- a first end (34) of the first section (28) is adapted for mounting in the bearing (26) and the flange (30) is mounted on the first section (28) at the second end (36) of the first section.
- the second drive shaft (24) terminates in a drive spigot (32).
- Two pairs of spigots (40) are arranged in an array within the lower housing (12), around the mouth (10) of the housing (12).
- the sanding shoe (22) is provided with a location hole (42) for location of the drive spigot (32).
- Two pairs of hollow, tapering, flexible columns (44) made of rubber are arranged, in an array matching that of the housing spigots (40), on the backing face (46) of the shoe (22).
- a perforated sandpaper sheet may be attached to the outer face (50) of the shoe (22), for example by the use of hook-and-loop fabric such as that sold as VELCRO (RTM) glued to face (50). Holes (52) passing through the shoe (22) facilitate the removal of dust etc, from the sanding face through the shoe (22) to exhaust outlet (16) via the duct (14). An extractor hose (not shown) may be attached to the exhaust outlet (16).
- the second drive shaft (24) comprises a first section (28), a flange (30) and a drive spigot (32).
- a first end (34) of the first section (28) is adapted for mounting in the bearing (26) and the flange (30) is mounted on the first section (28) at the second end (36) of the first section.
- the second drive shaft (24) terminates in the drive spigot (32).
- the drive spigot (32) tapers from a diameter d 1 at its face adjoining the flange (30) to a diameter d 2 at its free end (38).
- the location hole (42) of the shoe (22) has a diameter d 3 at the backing face (46) of the shoe (22), and a diameter d 4 at the outer face (50) of the shoe (22).
- the motor axis A M is offset from the axis A B of the eccentric bearing (26) by a radial eccentricity e.
- the flexible columns (44) are located on the spigots (40) and the drive spigot (32) of the second drive shaft (24) is aligned sufficiently with the location hole (42) of the shoe (22) for the drive spigot (32) to be guided into the location hole (4) as the screw (18) is tightened and the shoe (22) secured to the second drive shaft (24).
Description
- The present invention relates to a powered oscillating hand tool, in particular an orbital sander, comprising a drive unit having an electric motor with a drive shaft to which a sanding shoe can be attached, as per the preamble of claim 1. An example of such a tool is disclosed in FR-A-2 104 073.
- In sanders of the orbital type, with a shaped shoe, the drive system comprises an eccentric which is restrained so that the sander shoe cannot spin independently of the motor and it therefore describes a regular orbit. The shoes of such sanders are available in a range of shapes and such sanders are in general used for the removal of relatively small quantities of material, for example for detailed work or for finishing. By choice of a suitably shaped shoe, it is possible to access areas which are inaccessible with a random orbit sander.
- The restraining mechanism by which the eccentric is restrained so that the sander shoe cannot spin independently of the motor and therefore describes a regular orbit, generally comprises a co-operating array of legs and spigots on the shoe and the sander body respectively. In order to avoid problems resulting from the system being out of balance, it is necessary for the location hole on the shoe, in which the drive shaft locates, to be centrally positioned on the shoe. This leads to difficulties in locating the location hole of the shoe on the second (eccentric) drive shaft at the same time as locating the corresponding legs and spigots. For the shaft to match the location hole on the shoe, it is necessary to deform the legs during this location. This has in practice meant that it has not been usual to provide orbital sanders with interchangeable, differently shaped shoes so that the user has generally had to purchase more than one orbital sander in order to have available a selection of differently shaped shoes.
- Known sanders have hence been either of the orbital type as described above, with a fixed shoe or of the random orbit type in which a circular platen is driven by a drive system which comprises an eccentric bearing so that the platen can spin independently of the motor, and the platen describes a random orbit.
- This has meant that when the user wished to have the ability to perform both coarse and detailed sanding operations, or to use differently shaped sanding shoes in order to access difficult areas it has been necessary for him to purchase two or more separate units of different types, or to purchase only one unit and suffer the disadvantages thereof.
- It is a further disadvantage of the known sanders that the drive shaft to which the sander head is attachable, and the hole by which the head is mounted on the shaft are each of generally circular section, flatted on opposite faces to assist in retaining the head on the sander. This design is more expensive to manufacture than a circular section and has the further disadvantage that when the user locates the head on the shaft, it is necessary to align the opposed flats on the shaft and head correctly, in order to avoid damage to the head or the shaft.
- FR-A-2 104 073 discloses an oscillating grinder comprising a housing containing a drive motor and a grinding wheel mounted on the housing by means of a large number of elastic columns, this grinding wheel being adapted to be driven in oscillating movement by the motor and by use of a transmission gear, the grinder being characterised in that the columns are directly engaged in the housing and in the grinding wheel.
- It is an object of the present invention to provide a powered oscillating hand tool comprising a drive unit having an electric motor with a drive shaft to which a sander head can be attached, in which the attachment means by which the sander head is attachable to the drive shaft is particularly convenient.
- The present invention therefore provides a powered oscillating hand tool comprising
- (i) a drive unit having an electric motor and a first drive shaft;
- (ii) an eccentric bearing mounted on the first drive shaft with a radial offset e relative to the first drive shaft;
- (iii) a second drive shaft mounted on the eccentric bearing and terminating in a drive spigot;
- (iv) a sanding shoe;
- (v) a location hole positioned on the backing face of
the sanding shoe for location of the second drive shaft and (vi) means to restrict the random orbit of the sanding shoe to a regular orbit,
characterised in that the drive spigot has a diameter d1 adjacent to the second end of the second drive shaft and a diameter d2 at its free end and the location hole has a diameter d3 at the backing face and a diameter d4 at the face adjacent to the working face of the shoe, and
c2 is the clearance between the drive spigot and the location hole at the face of the location hole adjacent to the working face when the shoe is mounted on the second drive shaft. - The invention thus provides a powered oscillating power tool which can easily be fitted with an orbital sander shoe or with an alternative sander head, such as a differently shaped sanding shoe or a random orbit sander head without requiring deformation of the restraining legs.
- The invention will now be further described with reference to the accompanying drawings in which
- Figure 1 is a side view, partially in section, of the drive unit of a first embodiment of a hand tool according to the present invention, fitted with an orbital sander shoe;
- Figure 2 is an exploded view of the sanding shoe and drive shaft of Figure 1 and
- Figure 3 is a section, on an enlarged scale, of a part of the tool according to Figures 1 and 2.
- Figures 1 and 2 show a drive unit (2) including an electric motor (not shown) located in upper housing (4) and driving shaft (6). A fan (8) mounted on shaft (6) is arranged to draw air in from mouth (10) of lower housing (12) and direct it through extractor duct (14) to exhaust outlet (16). A screw (18) and washer (20) are used to secure a sanding shoe (22) to a second drive shaft (24) which is housed in the fan (8) by bearing (26) which is eccentrically located radially in respect to shaft (8).
- The second drive shaft (24) comprises a first section (28), a flange (30) and a drive spigot (32). A first end (34) of the first section (28) is adapted for mounting in the bearing (26) and the flange (30) is mounted on the first section (28) at the second end (36) of the first section. The second drive shaft (24) terminates in a drive spigot (32).
- Two pairs of spigots (40) are arranged in an array within the lower housing (12), around the mouth (10) of the housing (12).
- The sanding shoe (22) is provided with a location hole (42) for location of the drive spigot (32). Two pairs of hollow, tapering, flexible columns (44) made of rubber are arranged, in an array matching that of the housing spigots (40), on the backing face (46) of the shoe (22).
- When the sanding shoe (22) is mounted on the second drive shaft (24), the tips (48) of the flexible columns (44) formed on the backing face (46) of the shoe (22) engage the housing spigots (40).
- A perforated sandpaper sheet (not shown) may be attached to the outer face (50) of the shoe (22), for example by the use of hook-and-loop fabric such as that sold as VELCRO (RTM) glued to face (50). Holes (52) passing through the shoe (22) facilitate the removal of dust etc, from the sanding face through the shoe (22) to exhaust outlet (16) via the duct (14). An extractor hose (not shown) may be attached to the exhaust outlet (16).
- As is shown in Figure 3, the second drive shaft (24) comprises a first section (28), a flange (30) and a drive spigot (32). A first end (34) of the first section (28) is adapted for mounting in the bearing (26) and the flange (30) is mounted on the first section (28) at the second end (36) of the first section. The second drive shaft (24) terminates in the drive spigot (32).
- The drive spigot (32) tapers from a diameter d1 at its face adjoining the flange (30) to a diameter d2 at its free end (38). The location hole (42) of the shoe (22) has a diameter d3 at the backing face (46) of the shoe (22), and a diameter d4 at the outer face (50) of the shoe (22).
- The motor axis AM is offset from the axis AB of the eccentric bearing (26) by a radial eccentricity e.
- When the tool is assembled, with the shoe (22) mounted on the drive shaft (24), there is a clearance c1, at the level of the backing face of the shoe, between the drive spigot (32) and the location hole (42) and a clearance c2 at the level of the outer face.
- In order to exchange a first shoe for an alternative shoe, the first shoe is removed and the alternative shoe is located an the second drive shaft.
- The flexible columns (44) are located on the spigots (40) and the drive spigot (32) of the second drive shaft (24) is aligned sufficiently with the location hole (42) of the shoe (22) for the drive spigot (32) to be guided into the location hole (4) as the screw (18) is tightened and the shoe (22) secured to the second drive shaft (24).
Claims (2)
- A dual function powered oscillating hand tool comprising(i) a drive unit (2) having an electric motor and a first drive shaft (6);(ii) an eccentric bearing (26) mounted on the first drive shaft (6) with a radial offset e relative to the first drive shaft (6);(iii) a second drive shaft (24) mounted on the eccentric bearing (26) and terminating in a drive spigot (38);(iv) a sanding shoe (22);(v) a location hole (42) positioned on the backing face (46) of the sanding shoe (22) for location of the second drive shaft (24) and(vi) means (40,44) to restrict the random orbit of the sanding shoe (22) to a regular orbit,
characterised in that the drive spigot (32) has a diameter d1 adjacent to the second end (36) of the second drive shaft (24) and a diameter d2 at its free end (38) and the location hole (42) has a diameter d3 at the backing face (46) and a diameter d4 at the face adjacent to the outer face (50) of the shoe (22), and
c2 is the clearance between the drive spigot (32) and the location hole (42) at the face of the location hole (42) adjacent to the outer face (50) when the shoe (22) is mounted on the second drive shaft (24). - A dual function powered oscillating hand tool according to claim 1 characterised in that a flange (30) is located between the second end (36) of the first section (28) of the second drive shaft (24) and the drive spigot (32).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29521328U DE29521328U1 (en) | 1994-12-24 | 1995-11-22 | Improved oscillating, hand-held tool |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9426259.9A GB9426259D0 (en) | 1994-12-24 | 1994-12-24 | Improved oscillating hand tool |
GB9426259 | 1994-12-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0719616A1 EP0719616A1 (en) | 1996-07-03 |
EP0719616B1 true EP0719616B1 (en) | 1997-12-29 |
Family
ID=10766622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19950308370 Expired - Lifetime EP0719616B1 (en) | 1994-12-24 | 1995-11-22 | Improved oscillating hand tool |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0719616B1 (en) |
DE (1) | DE69501313T2 (en) |
GB (1) | GB9426259D0 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003524517A (en) * | 1999-05-19 | 2003-08-19 | ポールセン ヴィリー | Vibration device |
US7198559B2 (en) * | 2004-12-23 | 2007-04-03 | Black & Decker, Inc. | Modular sander-casing architecture |
NL1030176C2 (en) * | 2005-10-12 | 2007-04-17 | Bosch Gmbh Robert | Hand tools with improved drive. |
DE102008012784A1 (en) | 2008-03-05 | 2009-09-10 | Kwm Entwicklungs-, Vertriebs- Und Service Gmbh | Working device i.e. knee pad, producing method for protection of human knee, involves providing carrier with parts of loop and hoop fastener and enclosing carrier by plastic material before or during transporting plastic material into form |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3578653A (en) | 1967-12-18 | 1971-05-11 | William E Wallace | Monoazonaphthotriazostilbene dyestuffs |
DE2039480A1 (en) * | 1970-08-08 | 1972-02-10 | Bosch Gmbh Robert | Orbital sander |
DE3805926C2 (en) * | 1988-02-25 | 1996-04-18 | Bosch Gmbh Robert | Motor-driven hand-held unit with oscillating tool movement |
DE4118392B4 (en) * | 1991-06-05 | 2010-03-18 | Robert Bosch Gmbh | Random Orbit Sander |
-
1994
- 1994-12-24 GB GBGB9426259.9A patent/GB9426259D0/en active Pending
-
1995
- 1995-11-22 DE DE1995601313 patent/DE69501313T2/en not_active Expired - Lifetime
- 1995-11-22 EP EP19950308370 patent/EP0719616B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0719616A1 (en) | 1996-07-03 |
DE69501313D1 (en) | 1998-02-05 |
GB9426259D0 (en) | 1995-02-22 |
DE69501313T2 (en) | 1998-04-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0694365B1 (en) | Improved oscillating hand tool | |
US5885146A (en) | Oscillating hand tool | |
EP0953407B1 (en) | Powered oscillating hand tool | |
EP1277544B1 (en) | Oscillating hand tool | |
JP2706224B2 (en) | Removable work tool assembly | |
US5626510A (en) | Power tool for surface treatment | |
EP0953406A2 (en) | Detail sander | |
US4592170A (en) | Orbital abrading or polishing tool | |
EP1277543B1 (en) | Oscillating hand tool | |
EP0719616B1 (en) | Improved oscillating hand tool | |
GB2312638A (en) | Hand held grinding machines | |
US3579915A (en) | Free orbital surface treating tool | |
JP4215877B2 (en) | Tool | |
US4551951A (en) | Detachable portable continuous-belt driving head | |
US5456630A (en) | Cleaning and dressing tool for buffing pads | |
CN2249147Y (en) | Disc-type sand grinding device | |
RU2164854C1 (en) | Universal hand-operated machine | |
JP3502194B2 (en) | Sanda | |
KR200308044Y1 (en) | The repair machine of shoes for total type | |
JP3498999B2 (en) | Multifunctional polishing equipment | |
KR20120133222A (en) | nonwoven grinder | |
JPH0551562U (en) | Rotary whetstone | |
JPH0611755Y2 (en) | Lens chamfering jig | |
JP3498998B2 (en) | Multifunctional polishing equipment | |
JP2000218534A (en) | Grinding device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
17P | Request for examination filed |
Effective date: 19961007 |
|
17Q | First examination report despatched |
Effective date: 19961113 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT |
|
ITF | It: translation for a ep patent filed |
Owner name: GUZZI E RAVIZZA S.R.L. |
|
REF | Corresponds to: |
Ref document number: 69501313 Country of ref document: DE Date of ref document: 19980205 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20081126 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20091127 Year of fee payment: 15 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091122 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 69501313 Country of ref document: DE Effective date: 20110601 Ref country code: DE Ref legal event code: R119 Ref document number: 69501313 Country of ref document: DE Effective date: 20110531 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110531 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20121206 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20121126 Year of fee payment: 18 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20131122 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20140731 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20131202 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20131122 |