EP0573826A1 - Ponçeuse portative motorisée à bande - Google Patents

Ponçeuse portative motorisée à bande Download PDF

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Publication number
EP0573826A1
EP0573826A1 EP93108152A EP93108152A EP0573826A1 EP 0573826 A1 EP0573826 A1 EP 0573826A1 EP 93108152 A EP93108152 A EP 93108152A EP 93108152 A EP93108152 A EP 93108152A EP 0573826 A1 EP0573826 A1 EP 0573826A1
Authority
EP
European Patent Office
Prior art keywords
belt
hand
gap
cover
sanding
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.)
Granted
Application number
EP93108152A
Other languages
German (de)
English (en)
Other versions
EP0573826B1 (fr
Inventor
Steffen Dipl.-Ing. Wünsch
Peter Stierle
Claus Dipl.-Ing. Kemmner
Karl-Heinz Dipl.-Ing. Braunbach
Cornelius Boeck
Herbert Färber
Rudolf Fuchs
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0573826A1 publication Critical patent/EP0573826A1/fr
Application granted granted Critical
Publication of EP0573826B1 publication Critical patent/EP0573826B1/fr
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
    • B24B23/06—Portable grinding machines, e.g. hand-guided; Accessories therefor with abrasive belts, e.g. with endless travelling belts; Accessories therefor
    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories

Definitions

  • the invention relates to a motor-driven hand-held belt sander according to the preamble of claim 1.
  • the gap or the distance between the housing and the deflection or drive rollers is invariably approximately 3 mm wide. Foreign bodies, chips and clothing can possibly be drawn into such a narrow gap as a result of the conveying effect of the rough grinding belt. The risk that the operator's fingers are injured is low.
  • the known hand belt sander has the disadvantage that a modern sanding belt made of approximately 5 mm thick non-woven material cannot be used due to the narrow gap, because the sanding belt would grind on the housing and could destroy it.
  • a disadvantage of other known hand belt grinders is that the Drive roller speed calculated for normal sanding belt, but too high for fleece sanding belt. Fleece sanding belt therefore wears out disproportionately if the speed is not reduced. This control process must be carried out manually using a separate speed control device, can be easily forgotten and is cumbersome
  • Another disadvantage of the known hand belt grinder is the lack of an overload circuit. This is not arranged because the hand belt grinder is loaded with strongly changing, very high torques in normal operation. An overload circuit is overwhelmed here because the threshold value of the torque, which is harmless to the user, is lower than the usual, average working torques. With a switch-off device that actually protects the user, the hand-held belt grinder would therefore switch itself off even in normal operation, and work progress would be significantly impeded.
  • the hand belt sander according to the invention with the characterizing features of claim 1 has the advantage that both normal sanding belts with a thickness of about 1 mm and fleece sanding belts with a thickness of about 5 mm can be used without changing from one to the other type of sanding belt special assembly steps or that increased wear would have to be accepted for fleece sanding belt.
  • the gap in the intake area of the sanding belt between the housing and the drive roller is so narrow and narrow, regardless of the sanding belt thickness, that all foreign bodies adhering to the sanding belt are rejected at the gap. Disruptions or impairment of the grinding work by rotating chips and foreign bodies and a risk of injury for the operator are almost impossible. Due to the automatically throttled rotational speed coupled to the use of fleece sanding belt, the service life of the sanding belt when using the hand belt sanding device according to the invention is significantly longer than in known devices.
  • FIG. 1 shows the longitudinal section of a hand belt sander according to the invention and FIG. 2 shows a partial view of a second embodiment of the hand belt sander according to the invention, FIG. 3 shows a side view of a third embodiment of the invention and FIG. 4 shows a view of the third embodiment from below.
  • the hand belt sander 1 shown in Figure 1 consists of a housing 3 with a handle 5, in which a switch button 7 is used to switch the motor, not shown, on and off.
  • a drive roller 9 is rotatably arranged on the housing 3 and a deflection roller 11 is arranged in parallel therewith, over which a schematically illustrated normal grinding belt 13 is guided all around.
  • a direction arrow 19 drawn above the grinding plate 17 indicates the direction of movement of the grinding belt 13.
  • a plate-like cover 27 which extends over the entire width of the grinding belt 13 and has its free end toward the grinding belt 13 or away from it about a pin 29, is arranged on the housing 3 of the hand belt sander 1.
  • the cover 27 is pivoted by means of a lever arm with a button 31 by hand.
  • the cover 27 or the key 31 is operatively connected to an electrical microswitch 28.
  • This is coupled to a power electronics module, which is not shown in detail and is connected to the power supply of the motor via electrical lines, which serves as a speed control device 30.
  • FIG. 2 of a hand belt sander 101 corresponds in principle to that according to FIG. 1 and shows a housing 103 with a handle 105 in which a switch button 107 is used to switch the motor (not shown) on and off.
  • a drive roller 109 is rotatably arranged on the housing 103 and a deflection roller (not shown) is arranged in parallel therewith, over which an approximately 5 mm thick non-woven abrasive belt 113 is guided all around.
  • a direction arrow 119 drawn above the grinding plate 117 indicates the direction of movement of the grinding belt 113.
  • the feed gap 121 becomes even larger, so that there is a considerably greater risk of injury to the operator if he touches the feed gap 121 with the fingers while the sanding belt 113 is running device.
  • a lateral gap 123 is larger or smaller, depending on the type of abrasive belt 113, and is therefore more or less dangerous, but far less of a concern than the feed gap 121 for the operator.
  • a front gap, not shown, on the deflection roller relative to the housing 103 is due to the rolling direction of the grinding belt 113 for the user harmless because there is an ejection effect.
  • a plate-like cover 127 which extends over the entire width of the grinding belt 113, is arranged on the housing 103 of the hand belt sander 101 so that it can pivot towards the grinding belt 113 or away from it about a pin 129.
  • the cover 127 is pivoted via a lever arm 130 with a manually operable adjusting screw 131 or nut 133.
  • the set screw 131 is concentrically surrounded by a compression spring 132, which tries to push the lever arm 130 away from the housing 103.
  • the cover 127 or its lever arm 130 is operatively connected to a microswitch 128, which is coupled to a power electronics module, which is not shown in detail and is connected to the power supply of the motor via electrical lines, which regulates the rotational speed.
  • the dashed cover 127 is shown in a position when equipped with a non-woven abrasive belt, in which the microswitch 128 is actuated by the lever arm 130, so that the speed control device is activated.
  • the cover 127 drawn with solid lines is shown in a position when equipped with normal grinding belt, in which the microswitch 128 is not reached by the lever arm 130, so that the speed control device is not activated.
  • FIGS. 3 and 4 corresponds in principle to that according to FIGS. 1 and 2 and shows a housing 203 with a handle 205 in which a switch button 207 is used to switch the motor (not shown) on and off.
  • a drive roller 209 is rotatably arranged on the housing 203 and a deflection roller 211 is arranged parallel thereto, via which an approximately 2 mm thick normal grinding belt 213 is guided all the way round.
  • a directional arrow 219 shown above the grinding plate 217 indicates the direction of movement of the grinding belt 213.
  • the feed gap 221 becomes somewhat smaller, so that there is also a slightly lower risk of injury for the operator if the finger comes into contact with the feed gap 221 while the abrasive belt 213 is running.
  • a lateral gap 223 is larger or smaller, depending on the type of abrasive belt 113, and is therefore more or less dangerous.
  • a front gap 225 on the deflection roller 211 to the housing 203 is harmless to the user due to the rolling direction of the grinding belt 213, because there is an ejection effect.
  • a plate-like cover 227 which extends over the entire width of the grinding belt 213, is arranged on the housing 203 of the hand belt sander 201 so as to be pivotable toward the grinding belt 213 or away from it about a pin 229.
  • the cover 227 is pivoted via a lever arm 230 with a button 231 against the force of a compression spring 232.
  • the compression spring 232 is coupled to a sensor 234, which switches the motor off when the spring force changes.
  • the arrangement of the sensor creates a safety device which switches off the motor of the hand-held belt grinder 201 when the operator's finger or larger foreign objects are jammed in the feed gap 221 and thus also serves as overload protection.
  • the senor 234 acts as a speed switch, which sets the optimum speed for the fleece sanding belt.
  • a roller 235 is arranged on the cover 227 near the grinding belt 213, which is rotatable about the axis 236 and rests against the entire width of the grinding belt 213 and secures rolling friction between the cover of the grinding belt 213.
  • the roller 235 is easily exchangeable and consists of soft elastic rubber or plastic with an adhesive surface. It serves as an abrasive belt cleaner.
  • An end of the cover 227 protruding beyond the roller 235 serves as a suction nozzle 238 in connection with a suction device, not shown, which is connected to the hand-held belt grinder via a connecting piece 237.
  • the dust extraction nozzle 238 in the cover 227 can be used to remove the grinding dust generated by the grinding belt 213 and moved to the feed gap in a particularly effective manner.
  • the operator nor subsequent operations, such as painting, are adversely affected by uncontrolled flung dust.
  • the sectional view of a section of FIG. 3 shown in FIG. 4 corresponding to the sectional view arrows 204 illustrates the position of the roller 235 and the shape of the suction nozzle 238 on the cover 227.
  • the cover 27, 127, 227 is made up to approximately 2 mm to the sanding belt 13 by means of the button 31, 231 or the adjusting screw 131 , 113 pivoted and is further away from the drive roller 9, 109, 209 in this position than when equipped with normal grinding belt.
  • the microswitch 28, 128 is switched on or the sensor 234 is activated.
  • the speed control device is switched on and the belt speed is reduced to approximately half the speed usual for normal sanding belts, and the service life of the fleece sanding belt is significantly extended without any additional operating effort.
  • the cover 27, 127, 227 When changing the sanding belt, the cover 27, 127, 227 is pivoted so far away from the drive roller 9, 109, 209 that the dismantling of the fleece sanding belt 13, 113 and exchange for normal sanding belt is carried out via the button 31, 231 or by means of the adjusting screw 131 about 2 mm thick is not hindered.
  • the cover 27, 127, 227 When assembly is complete, the cover 27, 127, 227 is pivoted back, so that there is a minimal insertion gap 21, 121, 221. In this or closer closed position of the cover 27, 127, 227, the microswitch 28, 128 remains switched off, the belt speed is not changed, so that the speed control device is not activated, the belt speed is not reduced and the normal grinding belt is moved at the optimum speed can.
  • the cover can be locked in certain positions by means of a latching device and the lateral gap between the housing and the sanding belt can also be changed to a minimum by a cover, regardless of the type of sanding belt inserted, i. H. adaptable to fleece or normal sanding belt.
  • a microswitch is arranged in such a way that the motor cannot be switched on when changing the grinding belt or when the feed gap is open.
EP93108152A 1992-06-06 1993-05-19 Ponçeuse portative motorisée à bande Expired - Lifetime EP0573826B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4218802A DE4218802A1 (de) 1992-06-06 1992-06-06 Motorgetriebener Handbandschleifer
DE4218802 1992-06-06

Publications (2)

Publication Number Publication Date
EP0573826A1 true EP0573826A1 (fr) 1993-12-15
EP0573826B1 EP0573826B1 (fr) 1997-01-02

Family

ID=6460597

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108152A Expired - Lifetime EP0573826B1 (fr) 1992-06-06 1993-05-19 Ponçeuse portative motorisée à bande

Country Status (3)

Country Link
EP (1) EP0573826B1 (fr)
DE (2) DE4218802A1 (fr)
MY (1) MY109236A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0936033A2 (fr) * 1998-02-06 1999-08-18 J. Wagner GmbH Outil à main motorisé
EP1604781A1 (fr) * 2004-06-07 2005-12-14 BLACK & DECKER INC. Ponceuse à bande
US7018280B2 (en) 2004-06-07 2006-03-28 Black & Decker Inc. Sanding apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7179158B2 (en) * 2005-07-07 2007-02-20 Michael Mastrobattista Belt sander eraser attachment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602436C (de) * 1932-06-16 1934-09-08 C F Scheer & Cie G M B H Bandschleifmaschine
US4118897A (en) * 1975-11-21 1978-10-10 Ronald Martin Belt-type sander accessory

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602436C (de) * 1932-06-16 1934-09-08 C F Scheer & Cie G M B H Bandschleifmaschine
US4118897A (en) * 1975-11-21 1978-10-10 Ronald Martin Belt-type sander accessory

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0936033A2 (fr) * 1998-02-06 1999-08-18 J. Wagner GmbH Outil à main motorisé
EP0936033A3 (fr) * 1998-02-06 2000-01-19 J. Wagner GmbH Outil à main motorisé
EP1604781A1 (fr) * 2004-06-07 2005-12-14 BLACK & DECKER INC. Ponceuse à bande
US7018280B2 (en) 2004-06-07 2006-03-28 Black & Decker Inc. Sanding apparatus
US7226346B2 (en) 2004-06-07 2007-06-05 Black & Decker Inc. Sanding apparatus

Also Published As

Publication number Publication date
MY109236A (en) 1996-12-31
DE4218802A1 (de) 1993-12-09
DE59304943D1 (de) 1997-02-13
EP0573826B1 (fr) 1997-01-02

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