EP2815843B1 - Dauerhafte Schleifmaschine mit Oszillationspufferelement - Google Patents

Dauerhafte Schleifmaschine mit Oszillationspufferelement Download PDF

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Publication number
EP2815843B1
EP2815843B1 EP13173240.6A EP13173240A EP2815843B1 EP 2815843 B1 EP2815843 B1 EP 2815843B1 EP 13173240 A EP13173240 A EP 13173240A EP 2815843 B1 EP2815843 B1 EP 2815843B1
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EP
European Patent Office
Prior art keywords
sander
buffer
durable
connection end
oscillation
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EP13173240.6A
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English (en)
French (fr)
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EP2815843A1 (de
Inventor
Bach Pangho Chen
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.)
Xpole Precision Tools Inc
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Xpole Precision Tools Inc
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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 present invention relates to a sander and particularly to an oscillation buffer element used in a sander.
  • Sanders are machine tools driven by high pressure gas or electric power to grind the surface of objects.
  • a conventional sander comprises a drive motor to receive the high pressure gas or electric power as the driving source and a sanding disk driven by the drive motor. During sanding operation the sanding disk is bonded to a replaceable sandpaper and driven by the drive motor to make high speed oscillation about a moving track. The grinding granules of the sandpaper are contacted with an object to flatten and smooth the contact surface or remove other object attached to the surface.
  • the conventional sander generally has at least one cylindrical pillar to connect the sander body and sanding disk.
  • U.S. patent Nos. 8231437 , 7056199 , 3862520 , 3815292 and 3345784 disclose a sander with elastic pillars installed in four corners of the sander body to fasten the sanding disk.
  • the elastic pillars can be a single strut at a greater diameter, or a cluster structure consisting of multiple elastic struts, as shown in U.S.
  • U.S. patent Nos. 7771253 , 6979254 , 6855040 and 5626510 disclose another type of sanders with two rows of clustered vertical pillars respectively installed in the front side and rear side of a sanding disk. Each row has a plurality of vertical elastic pillars. When the sanding disk oscillates, the elastic pillars share the oscillation force generated by the sanding disk and reduce the vibration transferred to the operator. Hence the operator can handle the sander easier.
  • FIG. 1A Please refer to FIG. 1A for an example disclosed in U.S. patent Nos. 7771253 , 6979254 , 6855040 and 5626510 that has elastic vertical pillars 11 and 11a arranged in a row.
  • the sander 10 starts running, as shown in FIG. 1B , the sanding disk 12 is driven by a drive motor and oscillates, and the movement of the sanding disk 12 is towed by the elastic vertical pillars 11 and 11a. Since each elastic vertical pillars 11 and 11a has straight structure and the same structural strength, in practice, when the sanding disk 12 oscillates the elastic vertical pillar 11 towards the oscillation direction deforms at a smaller amount than other elastic vertical pillar 11a away from the oscillation direction.
  • a lift elevation R takes place at some edge of the sanding disk 12 during operation.
  • the moving track of the sanding disk 12 does not locate on the same plane.
  • the deformation takes place mainly at the center portion 111 of the elastic vertical pillars 11 and 11a.
  • the center portion 111 of the elastic vertical pillars 11 and 11a could be fractured most easily.
  • the elastic vertical 11 and 11a are individual straight structure, the lifespan is determined by its own structural strength when the sander 10 is operated.
  • the primary object of the present invention is to solve the problems of the conventional sanders that the edge of the sanding disk is not in close contact with a working object during oscillation, and the center portion of the elastic vertical strut coupled the sander body and sanding disk is easier fractured that result in a short lifespan.
  • the present invention pro-vides a durable sander comprising a body holding a drive motor inside, a sanding disk driven by the drive motor to perform sanding movement against the body and at least one oscillation buffer element.
  • the oscillation buffer element includes an upper connection bar fastened to the body, a lower connection bar fastened to the sanding disk and a plurality of buffer portions bridging the upper connection bar and lower connection bar in an integrated manner.
  • Each buffer portion has a first connection end connected to the upper connection bar, a second connection end connected to the lower connection bar and an elastic buffer section interposed between the first connection end and second connection end.
  • the elastic buffer section is formed at a length greater than a distance between the first and second connection ends.
  • first connection ends of the buffer portions are connected to each other, and the second connection ends of the buffer portions also are connected to each other.
  • first connection ends of the buffer portions are separated from each other, and the second connection ends of the buffer portion also are separated from each other.
  • first connection end and second connection end of each buffer portion are located at a same vertical axis, and the elastic buffer section of each buffer portion includes at least one deviation section away from the vertical axis.
  • the elastic buffer section is formed in an arched shape.
  • the elastic buffer sections are mirrored about a symmetrical axis.
  • the oscillation buffer element includes a plurality of first elastic buffer sections and a plurality of second elastic buffer sections which are respectively mirrored about a symmetrical axes.
  • the buffer portions are located on a same plane.
  • the elastic buffer section is formed at a width increased from the first connection end towards the second connection end.
  • first connection end is formed at a width smaller than that of the elastic buffer section, and the width of the elastic buffer section is smaller than that of the second connection end.
  • the buffer portion at the outer side of the oscillation buffer element is formed at a width greater than that of the buffer portion in the center of the oscillation buffer element.
  • the upper connection bar and lower connection bar of the oscillation buffer element respectively include a first hole and a second hole run through by a fastening element which is screwed on the body or sanding disk.
  • the body has a housing to hold the drive motor.
  • the housing has a first fastening hole corresponding to the first hole and run through by the fastening element.
  • the sanding disk has a support frame and a sanding portion fastened to the support frame.
  • the support frame includes a second fastening hole corresponding to the second hole and run through by the fastening element.
  • the drive motor includes a shaft connected to the sanding disk.
  • the invention provides features of having an oscillation buffer element interposed between a body and a sanding disk of a sander.
  • the oscillation buffer element has an elastic buffer section which is deformable during operation of the sander.
  • the elastic buffer section is formed in a curved shape, hence can provide better extensibility during deformation to stabilize oscillation of the sanding disk so that the sanding disk can oscillate horizontally on the same plane.
  • As the elastic buffer section has a longer deformation zone, it can reduce stress concentrated on various local structures in a prolonged operation period so as to extend the lifespan of the sander.
  • the durable sander mainly comprises a body 20 and a sanding disk 30.
  • the body 20 has a housing 21 and a drive motor 22 installed in the housing 21.
  • the drive motor 22 is connected to the sanding disk 30 through a shaft 221.
  • the sanding disk 30 can be driven by the drive motor 22 to perform sanding movement against the body 20.
  • the drive motor 2 can be an electric motor driven by drive power converted from external power via a power modulation circuit, or a pneumatic motor driven by high pressure gas.
  • the sanding disk 30 has a support frame 31 and a sanding portion 32 fastened to the support frame 31.
  • the sanding portion 32 is bonded to a sandpaper.
  • the sander further includes at least one oscillation buffer element 40 which has an upper connection bar 41 fastened to the body 20, a lower connection bar 42 fastened to the sanding disk 30 and a plurality of buffer portions 43 bridging the upper connection bar 41 and lower connection bar 42 in an integrated manner.
  • the upper connection bar 41 and lower connection bar 42 of the oscillation buffer element 40 respectively include a first hole 411 and a second hole 421 run through by a fastening element 50.
  • the housing 21 includes a first fastening hole 211 corresponding to the first hole 411 run through by the fastening element 50.
  • the support frame 31 includes a second fastening hole 311 corresponding to the second hole 421 run through by the fastening element 50.
  • each buffer portion 43 has a first connection end 431 connected to the upper connection bar 41, a second connection end 432 connected to the lower connection bar 42 and an elastic buffer section 433 interposed between the first connection end 431 and second connection end 432.
  • the elastic buffer section 433 is formed at a length greater than the distance a between the first connection end 431 and second connection end 432.
  • the first and second connection ends 431 and 432 of each buffer portion 43 are located at a same vertical axis X1.
  • the elastic buffer section 433 of each buffer portion 43 also includes at least one deviation section 434 away from the vertical axis X1.
  • the elastic buffer section 433 can be formed in an arched shape with a continuous smooth curve.
  • the buffer portions 43 of the oscillation buffer element 40 are located on a same plane.
  • the drive motor 22 drives the sanding disk 30 to oscillate through the shaft 221, and the oscillation buffer element 40 connected the body 20 and sanding disk 30 also deforms.
  • the lower connection bar 42 drawn by the sanding disk 30 also is moved rightward, and the elastic buffer section 433 connected to the second connection end 432 also is driven and deforms rightward. If the sanding disk 30 is moved leftward against the body 20, the elastic buffer section 433 also deforms leftward.
  • the elastic buffer section 433 Due to the length of the elastic buffer section 433 is greater than the distance a between the first connection end 431 and second connection end 432, the deformation zone of the elastic buffer section 433is longer to reduce the stress generated by the deformation and the deformation amount of each unit length. Moreover, the elastic buffer section 433 has sufficient extensibility to make the sanding disk 30 to oscillate steadily and horizontally on the same plane during movement.
  • the first connection ends 431 of the buffer portions 43 are connected to each other, and the second connection ends 432 of the buffer portions 43 also are connected to each other. Since the first and second connection ends 431 and 432 of different buffer portions 43 are connected to each other, the connection of the buffer portion 43 with the upper connection bar 41 or lower connection bar 42 is enhanced, and total structural strength of the oscillation buffer element 40 also increases.
  • the first connection ends 431 of the buffer portions 43 are separated from each other and the second connection ends 432 of the buffer portions 43 are separated from each other, as shown in FIG. 5 .
  • the buffer portions 43 of the oscillation buffer element 40 also are separated from each other.
  • FIG. 3 illustrates an embodiment in which the oscillation buffer element 40 includes a plurality of elastic buffer sections 433 mirrored about a symmetrical axis X2.
  • FIG. 6 depicts another embodiment in which the oscillation buffer element 40 includes a plurality of first elastic buffer sections 433a and a plurality of second elastic buffer sections 433b which are respectively mirrored about a symmetrical axis X2.
  • the lower half portion of the oscillation buffer element 40 usually deforms at a greater amount than the upper half portion.
  • the first connection end 431 can be formed at a width W1 smaller than the width W2 of the elastic buffer section 433, and the width W2 of the elastic buffer section 433 is smaller than the width W3 of the second connection end 432.
  • the width of the elastic buffer section 433 can be increased from the first connection end 431 towards the second connection end 432.
  • the width of the buffer portion 43a at the outer side of the oscillation buffer element 40 is greater than the width of the buffer portion 43b in the center of the oscillation buffer element 40.
  • the durable sander of the invention provides a feature with at least one oscillation buffer element interposed between the body and sanding disk.
  • the oscillation buffer element has an elastic buffer section which can deform during operation of the sander.
  • the elastic buffer section is formed in a curved structure to provide better extensibility during deformation to stabilize horizontal oscillation of the sanding disk on the same plane and maintain sanding quality. Comparing with the conventional vertical straight elastic strut structure, the elastic buffer section has longer deformation zone to reduce stress concentrated on local structures in prolonged operation period. As a result, overall lifespan of the sander is prolonged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (15)

  1. Eine strapazierfähige Schleifmaschine, umfassend:
    einen Gehäusekörper (20), der innen einen Antriebsmotor (22) enthält;
    eine Schleifscheibe (30), die durch den Antriebsmotor (22) angetrieben wird, um eine Bewegung gegen den Gehäusekörper (20) durchzuführen; und
    wenigstens ein Oszillationspufferelement (40), das eine obere Verbindungsleiste umfasst (41), die an dem Gehäusekörper (20) befestigt ist, eine untere Verbindungsleiste (42), die mit der Schleifscheibe (30) verbunden ist, und einer Vielzahl von Pufferelementen (43), die die obere Verbindungsleiste (41) und die untere Verbindungsleiste (42) in einer integrierten Weise überbrückt; jede der Vielzahl von Pufferelementen (43) umfasst ein erstes Verbindungsende (431), das mit der oberen Verbindungsleiste (41) verbunden ist, ein zweites Verbindungsende (432), das mit der unteren Verbindungsleiste (42) verbunden ist, und ein elastischer Pufferabschnitt (433), der zwischen dem ersten Verbindungsende (431) und dem zweiten Verbindungsende (432) angeordnet ist, dadurch gekennzeichnet, dass der elastische Pufferabschnitt (433) in einer Länge geformt ist, die größer ist als ein Abstand (a) zwischen dem ersten Verbindungsende (431) und dem zweiten Verbindungsende (432).
  2. Die strapazierfähige Schleifmaschine nach Anspruch 1, wobei die ersten Verbindungsenden (431) der Pufferelemente (43) miteinander verbunden sind und die zweiten Verbindungsenden (432) der Pufferelemente (43) miteinander verbunden sind.
  3. Die strapazierfähige Schleifmaschine nach Anspruch 1 oder 2, wobei die ersten Verbindungsenden (431) der Pufferelemente (43) voneinander getrennt sind und die zweiten Verbindungsenden (432) der Pufferelemente (43) voneinander getrennt.
  4. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 3, wobei das erste Verbindungsende (431) und das zweite Verbindungsende (432) jeder Pufferelemente (43) an einer gleichen vertikalen Achse (X1) angeordnet sind, wobei der elastische Pufferabschnitt (433) jeder Pufferelemente (43) mindestens einen Abweichungsabschnitt (434), weggerichtet von der vertikalen Achse (X1), aufweist.
  5. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 4, wobei der elastische Pufferabschnitt (433) in einer bogenförmigen Form ausgebildet ist.
  6. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 5, wobei der elastischen Pufferabschnitt (433) um eine Symmetrieachse (X2) gespiegelt ist.
  7. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 6, wobei das Oszillationspufferelement (40) eine Mehrzahl von ersten elastischen Pufferabschnitten (433a) und eine Mehrzahl von zweiten elastischen Pufferabschnitten (433b) aufweist, die jeweils über eine Symmetrieachse (X2) gespiegelt sind.
  8. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 7, wobei die Pufferelemente (43) auf einer gleichen Ebene angeordnet sind.
  9. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 8, wobei der elastische Pufferabschnitt (433) in einer Breite ausgebildet ist, die sich vom ersten Verbindungsende (431) in Richtung des zweiten Verbindungsendes (432) erhöht.
  10. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 9, wobei das erste Verbindungsende (431) in einer Breite (W1), die kleiner als die des elastischen Pufferabschnitts (433) ausgebildet ist, und die Breite (W2) des elastischen Pufferabschnitts (433) ist kleiner als die des zweiten Verbindungsendes (432).
  11. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 10, wobei das Pufferelemente an einer Außenseite (43a) des Oszillationspufferelements (40) in einer Breite ausgebildet ist, die größer ist, als die des Pufferelements in der Mitte (43b) des Oszillationspufferelements (40).
  12. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 11, wobei die obere Verbindungsleiste (41) und die unteren Verbindungsleiste (42) des Oszillationspufferelements (40) jeweils ein erstes Loch (411) und ein zweites Loch (421) aufweisen, durch das ein Befestigungselement (50) sich erstreckt, das am Gehäusekörper (20) oder der Schleifscheibe (30) eingeschraubt ist.
  13. Die strapazierfähige Schleifmaschine nach Anspruch 12, wobei der Gehäusekörper (20) ein Gehäuse (21) umfasst, um den Antriebsmotor (22) zu halten, das Gehäuse (21) umfasst ein erstes Befestigungsloch (211),entsprechend dem ersten Loch (411) und wird durch das Befestigungselement (50) durchlaufen.
  14. Die strapazierfähige Schleifmaschine nach Anspruch 12 oder 13, wobei die Schleifscheibe (30) ein Stützgerüst (31) und einem Schleifabschnitt (32) umfasst, die mit dem Stützgerüst (31) befestigt sind, das Stützgerüst (31) umfasst ein zweites Befestigungsloch (311) entsprechend dem zweiten Loch (421) und durch das ein Befestigungselement (50) durchläuft.
  15. Die strapazierfähige Schleifmaschine nach einem der Ansprüche 1 bis 14, wobei der Antriebsmotor (22) eine Welle (221) umfasst, die mit der Schleifscheibe (30) verbunden ist.
EP13173240.6A 2013-06-21 2013-06-21 Dauerhafte Schleifmaschine mit Oszillationspufferelement Active EP2815843B1 (de)

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EP13173240.6A EP2815843B1 (de) 2013-06-21 2013-06-21 Dauerhafte Schleifmaschine mit Oszillationspufferelement

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EP13173240.6A EP2815843B1 (de) 2013-06-21 2013-06-21 Dauerhafte Schleifmaschine mit Oszillationspufferelement

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EP2815843A1 EP2815843A1 (de) 2014-12-24
EP2815843B1 true EP2815843B1 (de) 2015-08-12

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4144481A1 (de) 2021-09-01 2023-03-08 X'Pole Precision Tools Inc. Schleifscheibenstabilisierungsstruktur für schwingschleifmaschinen

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2272008A (en) * 1939-10-24 1942-02-03 Sterling Tool Products Company Rubbing device
US3345784A (en) 1964-12-29 1967-10-10 Rockwell Mfg Co Orbital finishing sander
US3793776A (en) * 1972-07-21 1974-02-26 Black & Decker Mfg Co Double insulated portable sander
US3815292A (en) 1972-08-21 1974-06-11 A Hutchins Structure and manufacture of abrading tool having suction system
US3862520A (en) 1974-02-14 1975-01-28 Singer Co Support assembly for a portable surface-treating machine
DE59400402D1 (de) 1993-02-04 1996-08-14 Bosch Gmbh Robert Handwerkzeugmaschine zur Flächenbearbeitung
DE19632218B4 (de) * 1996-08-09 2007-08-23 Robert Bosch Gmbh Schwingschleifer
US6979254B1 (en) 1997-01-23 2005-12-27 Hao Chien Chao Ergonomically friendly orbital sander construction
US6855040B2 (en) 1997-01-23 2005-02-15 Hao Chien Chao Ergonomically friendly orbital sander construction
NL1015488C2 (nl) 2000-06-21 2001-12-28 Skil Europ Bv Vlakschuurmachine met verwisselbaar deel van schuurzool.
ITMI20030054U1 (it) 2003-02-13 2004-08-14 Valentini Guido Piedino di collegamento per macchine a movimento orbitale per la lavor azione di superfici in particolare per levigatrici orbitali
DE10342152A1 (de) * 2003-09-12 2005-04-07 Robert Bosch Gmbh Vorrichtung zur Reduzierung der Vibration eines Schwingschleifers
DE102004016015A1 (de) 2004-04-01 2005-10-20 Bosch Gmbh Robert Handgeführte Schleifmaschine, Schleifmaschinen-Halteeinheit sowie Schleifmaschinen-Gehäuse
US8231437B2 (en) 2008-03-03 2012-07-31 Black & Decker Inc. Low height quarter sheet sander

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