US20080153406A1 - Dust collection system for a belt sander - Google Patents
Dust collection system for a belt sander Download PDFInfo
- Publication number
- US20080153406A1 US20080153406A1 US12/041,202 US4120208A US2008153406A1 US 20080153406 A1 US20080153406 A1 US 20080153406A1 US 4120208 A US4120208 A US 4120208A US 2008153406 A1 US2008153406 A1 US 2008153406A1
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- United States
- Prior art keywords
- dust
- fan
- housing
- electrically powered
- flow path
- 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.)
- Abandoned
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Classifications
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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
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
- B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
- B24B55/107—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with belt-like tools
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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
- B24B23/06—Portable grinding machines, e.g. hand-guided; Accessories therefor with abrasive belts, e.g. with endless travelling belts; Accessories therefor
Definitions
- the present invention generally relates to electric powered portable sanders having a dust collection system. More particularly it relates to portable belt sanding power tools.
- All sanding tools create a large amount of dust.
- a belt sander creates large quantities of wood dust both in the air and on the surface of the workpiece.
- These dust collection systems typically use a fan driven directly by the motor to create a suction for the dust collection system.
- the dust collection fan may be half of a two-sided or double sided fan (the other half cooling the motor) or it may be mounted on one end of a motor opposite to the other end bearing a motor cooling fan. In either case, dust laden air is deliberately routed past the motor and dust leakage into the motor is aggravated.
- a second, separately controllable electric motor and fan is provided for the dust collection system.
- the inclusion of a separate dust collection motor drives up the size, weight, and cost of the sander.
- an object of the present invention to provide an improved sander that provides a dust collection system wherein an obstruction of the dust removal path does not reduce cooling air flow to the motor. It is another object of the present invention to provide a sander dust collection system that allows for operation of the sander with the dust collection airflow deliberately blocked or stopped.
- Flag bag receptacles are fabric dust bags usually suspended from a support over the top of the sander or set off to one side. The height of the bag and the location create problems with tool access to and with user vision of the workpiece. As the bag fills with dust the added weight can unbalance a type of portable tool that is often already top heavy. Furthermore, as it fills the bag will often droop down into dragging contact with the workpiece, which can damage the bag or pull the sander from the intended track.
- the present invention provides a sander with a separate dust collection fan driven off the main motor, but not directly connected to it.
- This dust fan can be located away from the motor for a more compact tool and improved dust removal airflow. Moreover it can be spun at a speed independent of the motor armature and more efficient for dust collection.
- the dust fan is powered from the main motor by means of a belt drive, but a gear train could also be used.
- the separate fan system can be turned off by either of two convenient methods.
- a user operable damper may be provided in the dust flow path to interrupt the airflow even though the fan continues to spin. Unlike the single motor single fan designs, this will have no adverse effect on cooling the motor.
- the dust fan can be disconnected from the motor, thus permanently disabling the dust collection system, unloading the motor, and decreasing tool noise.
- the sander is provided with a semi-rigid dust cassette that is mounted low and rearward of the sander.
- a semi-rigid dust cassette that is mounted low and rearward of the sander.
- the dust fan does not have to blow dust upward into a fabric sack that is held open only by the air pressure within.
- the preferred dust receptacle/cassette reduces the access, vision, and balance problems associated with the “flag bag” type receptacles.
- the dust receptacle comprises a flexible part of rubber like material.
- the flexible part of the dust receptacle can be deformed in order to facilitate alignment and engagement of the dust receptacle when mounting it to the sander,
- secure engagement is further enhanced by the provision of a positive locking mechanism for holding together the dust outlet of the sander housing and the inlet of the dust receptacle.
- the locking mechanism comprising a movable collar on the outlet duct of the housing which lockably engages tabs on the inlet nozzle of the dust receptacle.
- FIG. 1 is an elevation view of a belt sander; according to the present invention, and with part of the exterior housing removed.
- FIG. 2 is a simplified exploded view of the belt sander of FIG. 1 .
- FIG. 3 is another simplified exploded view of the belt sander of FIG. 1 .
- FIG. 4 is another simplified exploded view of the belt sander of FIG. 1 .
- FIG. 5 is a right side elevation view of the gear case of the belt sander of FIG. 1 .
- FIG. 6 is a left side elevation view of the gear case of FIG. 5 .
- FIG. 7 is another side elevation view of the gear case of FIG. 5 .
- FIG. 8 is a perspective view of the gear case of the belt sander of FIG. 1 .
- FIG. 9 is a close up perspective view of portions of the gear case of FIG. 8 .
- FIG. 10 is a partial cutaway and close-up perspective view of details of the dust fan of the belt sander of FIG. 9 .
- FIG. 11 is a cutaway elevation view of the dust fan of FIG. 10 .
- FIG. 12 is a further cutaway perspective view of the dust fan of FIG. 10 .
- FIG. 13 is a cutaway elevation view of the dust fan of FIG. 12 .
- FIG. 14 is a cross section elevation view of the dust fan of FIG. 13 .
- FIG. 15 is a simplified elevation view of portions of the belt sander of FIG. 1 with the addition of elements of the dust receptacle.
- FIG. 16 is a perspective view of the belt sander and dust receptacle of FIG. 15 with additional elements added.
- FIG. 17 is a perspective view of the dust fan enclosure and collar assembly of the FIG. 15 .
- FIG. 18 is a rear end elevation view of the fan enclosure and collar assembly of FIG. 17 .
- FIG. 19 is an alternative perspective view of the fan enclosure and collar assembly of FIG. 17 .
- FIG. 20 is an exploded perspective view of the dust receptacle of the belt sander of FIG. 16 .
- motor assembly 10 is transversely mounted between the rearwardly located drive roller 9 and the front roller assembly 8 .
- the motor output shaft which extends through an opening in gear case cover 4 , ends in drive pulley 12 .
- Drive pulley 12 pulls drive belt 14 .
- Drive belt 14 turns driven pulley 16 .
- Driven pulley 16 through gearing not shown, turns rear drive roller 9 .
- a second portion of driven pulley 16 pulls dust collection fan belt 18 , which powers a dust collection fan 20 that is located on an upper portion of -ear case cover 4 .
- fan belt 18 is an o-ring.
- the left-hand/outward side of the gear case cover 4 is covered by belt cover/housing 6 , which encloses the pulleys 12 and 16 and belts 14 and 18 .
- belt cover/housing 6 which encloses the pulleys 12 and 16 and belts 14 and 18 .
- Completing the frame/superstructure of the sander is the right side housing 3 .
- the suction created by dust fan 20 pulls an air flow (indicated by arrows in FIG. 5 ) from the vicinity of drive wheel 9 through an air passage 22 cast into the right housing 3 and gear case 4 .
- Upper portions of both the right housing 3 and gear case 4 define an inlet or suction chamber 24 .
- the upper portion of gear case 4 also defines suction openings 26 in a trefoil arrangement.
- Rotatably mounted to the upper exterior portion of gear case 4 is an inlet or suction damper 28 .
- Damper 28 has trefoil openings and a user operable switch or damper 29 for rotating the damper 28 between an open or “ON” position, wherein the suction openings 26 and damper openings are aligned, and a closed or suction “OFF” position, wherein the damper is unaligned and blocks the suction openings 26 .
- dust fan 20 is rotatably and coaxially mounted with damper 28 and suction openings 26 .
- Dust fan 20 includes a pulley portion 23 , to which fan belt 18 is drivingly connected.
- Dust fan 20 is a radial type fan. That is, rotation of dust fan 20 creates a suction at its center and a pressure around its periphery, so that airflow is from the center radially outward through the fan vanes 21 to the periphery.
- Fan enclosure 30 Mounted to the exterior of gear case 4 is fan enclosure 30 with fan 20 sandwiched in between. Fan enclosure 30 and gear case 4 define between them a fan chamber 31 . Fan 20 divides fan chamber 31 into a radially inward suction/inlet chamber 32 and a radially outward discharge/outlet chamber 33 . Fan enclosure 30 also defines a slot 34 , through which damper switch 29 projects, and an opening 35 , through which pulley portion 23 of fan 20 projects.
- locking collar assembly 40 comprises a collar 42 movably mounted to the exterior of duct 36 .
- Collar 4 A is movable between a first locked position, wherein it secures the inlet 61 of the dust cassette 60 to the outlet of the duct 36 , and a second unlocked position, wherein the dust cassette is detachable from the outlet duct 36 .
- Motor 10 drives driven pulley 12 via drive belt 14 .
- driven pulley 16 drives dust fan 20 via fan belt is.
- Rotation of dust fan 20 creates a suction that pulls air and dust from the vicinity of rear drive wheel 9 through air passage 22 and into chamber 34 .
- damper 28 With damper 28 in the “ON” position, the air and dust is drawn through openings 26 and damper 28 and across fan 20 .
- the air and dust is exhausted from the fan 20 through duct 36 and locking collar assembly 40 into the dust cassette 60 . In the dust cassette 60 the dust is trapped while the air is filtered and exhausted across the air permeable sides.
- the user may rotate the suction damper 28 to the “OFF” position. In the OFF position the dust fan 20 will continue to turn, but will not produce a suction in the vicinity of the rear drive wheel 9 .
- the user may temporarily remove belt cover 6 from gear case 4 , thus exposing the belts 14 and 18 .
- Fan belt 18 may be removed from driven pulley 16 and pulley portion 23 of dust fan 20 . With fan belt 18 removed, the dust fan 20 will not be turned and no airflow will be produced in any portion of the dust collection path.
- seal member 27 is in the form of a flexible overmold bonded to the damper 28 .
- the seal overmold 27 provides a sufficiently tight fit between enclosure 30 an damper 28 so as to limit air in leakage to the suction side of fan 20 , while permitting relative rotation between damper and enclosure.
- dust cassette 60 comprises a first part 62 and a second part 64 .
- First part 62 is substantially funnel shaped as it expands from a small upstream/inlet end 61 , connected to the exhaust duct 36 by means of the collar assembly 40 , to a larger rectangular shaped downstream end 63 .
- First part 62 is preferably semi-rigid, that is slightly flexible, so that it may be deformed for ease of installation and connection.
- first part 62 may be made of Santoprene® or another rubber-like material.
- Second pan 64 is an air permeable fabric skin over a rigid frame 80 .
- Dust cassette 60 is substantially full of dust it can be quickly emptied by breaking the connection 66 between the first part 62 and the second part 64 .
- First part 62 of cassette 60 comprises a flexible clip 67 and an inlet end 61 .
- flexible clip 67 hooks onto and grips a flange 7 located on the rearward end of belt cover 6 .
- inlet end 61 is inserted into the locking collar assembly 40 .
- the simultaneous alignment of the clip 67 , flange 7 , inlet end 6 . 1 , and locking collar assembly 40 is made easier by the flexible material of first part 62 , which the user can deform in order to make the two connections.
- Inlet end 61 includes two protruding ribs 69 .
- inlet end 61 With collar 42 in the second/unlocked position, inlet end 61 is fit into the collar assembly 40 so that ribs 69 are inserted through and past cutouts 43 in collar 42 and fit into recesses 38 defined in the outlet end flange 37 of the outlet duct 36 .
- Collar 42 which slidably engages end flange 37 , can then be slid down to its first position, wherein collar 42 traps ribs 69 within recesses 38 , thus locking inlet end 61 in collar assembly 40 .
- Mating detent structures 39 on flange 37 and 46 on the collar 42 restrain the collar in either of the locked or unlocked position, unless overcome by the force of the user deliberately moving the collar.
- the second part 64 of the dust cassette 60 is a dust bag/box constructed as an air permeable fabric stretched over a rigid frame 80 in the known way.
- second pant 64 is substantially a rectangular solid and open at one side 65 .
- frame 80 defines opposed slots 82 on opposite sides of the open end and an upper lip 84 .
- the downstream end 63 of first part 62 (shown in the facing view 20 A) includes a flange 70 and flexible tabs 72 .
- a hook 74 is pivotably attached to first part 62 proximate to the downstream end.
- the flange 70 of first part 62 is slid into slots 82 of frame 80 of the second part 64 until open side 65 of the second part is aligned with the downstream end 63 of the first part.
- flexible tabs 72 on first part 62 will detent underneath lip 84 of the second part 64 to secure the first part and second part together. Additional security is provided by the hook 74 on first part 62 , which can be pivoted to engage a latch 86 on the second part 64 .
- Disconnecting of the two parts 62 and 64 is made easier by the flexible construction of the first part. After unlatching hook 74 , the user can squeeze and deform first part 62 so as to undo the detent between tabs 72 and lip 84 . Then flange 70 may be readily slid out of slots 82 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
An electrically powered belt sander comprising a housing, a dust flow path defined by the housing, a motor mounted in the housing at a first location and having an output shaft, a fan connectable to the motor output shaft and rotateably mounted in the housing at a second location a distance from the motor output shaft, a belt connectable between the motor output shaft and the fan whereby the rotation of the motor output shaft drives the rotation of the fan, and a damper located in the dust flow path and operable for blocking the dust flow path.
Description
- The present invention generally relates to electric powered portable sanders having a dust collection system. More particularly it relates to portable belt sanding power tools.
- All sanding tools create a large amount of dust. In particular, a belt sander creates large quantities of wood dust both in the air and on the surface of the workpiece. Because of this most electric sanders employ some sort of dust collection system. These dust collection systems typically use a fan driven directly by the motor to create a suction for the dust collection system. The dust collection fan may be half of a two-sided or double sided fan (the other half cooling the motor) or it may be mounted on one end of a motor opposite to the other end bearing a motor cooling fan. In either case, dust laden air is deliberately routed past the motor and dust leakage into the motor is aggravated.
- Furthermore, these systems tend to clog due to the tortuous flow path though and around narrow channels, small chokes, and tight corners. Clogging of the dust removal flow path not only degrades or stops dust collection, it can also foul the dust fan, load down the motor, and reduce cooling air to the sander motor, which may damage the motor. Another drawback of those systems employing a main motor fan to collect dust is that, when the user would prefer to work without dust collection, such systems cannot be deliberately shut off, because of the need to cool the motor. Simply leaving off the dust receptacle is often impractical since a stream of dust laden air would then exhaust at or near the user.
- In some sanders such as the Black & Decker model 4028, a second, separately controllable electric motor and fan is provided for the dust collection system. The inclusion of a separate dust collection motor, however, drives up the size, weight, and cost of the sander.
- Accordingly, it is an object of the present invention to provide an improved sander that provides a dust collection system wherein an obstruction of the dust removal path does not reduce cooling air flow to the motor. It is another object of the present invention to provide a sander dust collection system that allows for operation of the sander with the dust collection airflow deliberately blocked or stopped.
- Another problem with current sander designs is the common use of so called “flag bag” dust receptacles. Flag bag receptacles are fabric dust bags usually suspended from a support over the top of the sander or set off to one side. The height of the bag and the location create problems with tool access to and with user vision of the workpiece. As the bag fills with dust the added weight can unbalance a type of portable tool that is often already top heavy. Furthermore, as it fills the bag will often droop down into dragging contact with the workpiece, which can damage the bag or pull the sander from the intended track.
- Accordingly it is another objective of the present invention to provide a dust receptacle that will not droop or sag when loaded and which can be securely mounted low down and behind the main body of the belt sander.
- Still another problem with current sanders is that the inlet of the dust receptacle and the dust outlet of the tool usually rely on a simple friction or taper fit to hold the two conical or tubular components together. Without a positive locking mechanism to hold the two parts together, it is possible for the two parts to separate during use, resulting in dust laden air blowing out of the suddenly exposed dust outlet.
- Accordingly it is still another objective of the present invention to provide a secure mechanical engagement between the improved dust receptacle and to provide a positive locking mechanism to prevent the inadvertent disengagement of the dust receptacle from the sander.
- In one preferred form, the present invention provides a sander with a separate dust collection fan driven off the main motor, but not directly connected to it. This dust fan can be located away from the motor for a more compact tool and improved dust removal airflow. Moreover it can be spun at a speed independent of the motor armature and more efficient for dust collection. In a preferred embodiment the dust fan is powered from the main motor by means of a belt drive, but a gear train could also be used.
- The separate fan system can be turned off by either of two convenient methods. A user operable damper may be provided in the dust flow path to interrupt the airflow even though the fan continues to spin. Unlike the single motor single fan designs, this will have no adverse effect on cooling the motor. Alternatively, the dust fan can be disconnected from the motor, thus permanently disabling the dust collection system, unloading the motor, and decreasing tool noise.
- In another preferred embodiment, the sander is provided with a semi-rigid dust cassette that is mounted low and rearward of the sander. Thus located, it reduces tool access and user vision problems. Moreover, the dust fan does not have to blow dust upward into a fabric sack that is held open only by the air pressure within. Additionally, so located and constructed the preferred dust receptacle/cassette reduces the access, vision, and balance problems associated with the “flag bag” type receptacles.
- In the preferred embodiment, the dust receptacle comprises a flexible part of rubber like material. Thus constructed, the flexible part of the dust receptacle can be deformed in order to facilitate alignment and engagement of the dust receptacle when mounting it to the sander,
- In another aspect of the preferred embodiment, secure engagement is further enhanced by the provision of a positive locking mechanism for holding together the dust outlet of the sander housing and the inlet of the dust receptacle. The locking mechanism comprising a movable collar on the outlet duct of the housing which lockably engages tabs on the inlet nozzle of the dust receptacle.
- Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, white indicating a preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
- A sander according to the present invention will now be described by way of example, with reference to the accompanying drawings in which;
-
FIG. 1 is an elevation view of a belt sander; according to the present invention, and with part of the exterior housing removed. -
FIG. 2 is a simplified exploded view of the belt sander ofFIG. 1 . -
FIG. 3 is another simplified exploded view of the belt sander ofFIG. 1 . -
FIG. 4 is another simplified exploded view of the belt sander ofFIG. 1 . -
FIG. 5 is a right side elevation view of the gear case of the belt sander ofFIG. 1 . -
FIG. 6 is a left side elevation view of the gear case ofFIG. 5 , -
FIG. 7 is another side elevation view of the gear case ofFIG. 5 . -
FIG. 8 is a perspective view of the gear case of the belt sander ofFIG. 1 . -
FIG. 9 is a close up perspective view of portions of the gear case ofFIG. 8 . -
FIG. 10 is a partial cutaway and close-up perspective view of details of the dust fan of the belt sander ofFIG. 9 . -
FIG. 11 is a cutaway elevation view of the dust fan ofFIG. 10 . -
FIG. 12 is a further cutaway perspective view of the dust fan ofFIG. 10 . -
FIG. 13 is a cutaway elevation view of the dust fan ofFIG. 12 . -
FIG. 14 is a cross section elevation view of the dust fan ofFIG. 13 . -
FIG. 15 is a simplified elevation view of portions of the belt sander ofFIG. 1 with the addition of elements of the dust receptacle. -
FIG. 16 is a perspective view of the belt sander and dust receptacle ofFIG. 15 with additional elements added. -
FIG. 17 is a perspective view of the dust fan enclosure and collar assembly of theFIG. 15 . -
FIG. 18 is a rear end elevation view of the fan enclosure and collar assembly ofFIG. 17 . -
FIG. 19 is an alternative perspective view of the fan enclosure and collar assembly ofFIG. 17 . -
FIG. 20 is an exploded perspective view of the dust receptacle of the belt sander ofFIG. 16 . - With reference to the accompanying
FIGS. 1 , 2, 3, and 47motor assembly 10 is transversely mounted between the rearwardly located drive roller 9 and thefront roller assembly 8. The motor output shaft, which extends through an opening ingear case cover 4, ends indrive pulley 12. - Drive
pulley 12 pullsdrive belt 14.Drive belt 14 turns drivenpulley 16. Drivenpulley 16, through gearing not shown, turns rear drive roller 9. A second portion of drivenpulley 16 pulls dustcollection fan belt 18, which powers adust collection fan 20 that is located on an upper portion of -ear case cover 4. In the preferred embodiment shown,fan belt 18 is an o-ring. - With particular reference to
FIGS. 24 , the left-hand/outward side of thegear case cover 4 is covered by belt cover/housing 6, which encloses thepulleys belts right side housing 3. - With additional reference to
FIGS. 5-7 , the suction created bydust fan 20 pulls an air flow (indicated by arrows inFIG. 5 ) from the vicinity of drive wheel 9 through anair passage 22 cast into theright housing 3 andgear case 4. Upper portions of both theright housing 3 andgear case 4 define an inlet orsuction chamber 24. The upper portion ofgear case 4 also definessuction openings 26 in a trefoil arrangement. Rotatably mounted to the upper exterior portion ofgear case 4 is an inlet orsuction damper 28.Damper 28 has trefoil openings and a user operable switch ordamper 29 for rotating thedamper 28 between an open or “ON” position, wherein thesuction openings 26 and damper openings are aligned, and a closed or suction “OFF” position, wherein the damper is unaligned and blocks thesuction openings 26. - With further reference to
FIGS. 8-14 , on the exterior side of thegear case 4,dust fan 20 is rotatably and coaxially mounted withdamper 28 andsuction openings 26.Dust fan 20 includes apulley portion 23, to whichfan belt 18 is drivingly connected.Dust fan 20 is a radial type fan. That is, rotation ofdust fan 20 creates a suction at its center and a pressure around its periphery, so that airflow is from the center radially outward through thefan vanes 21 to the periphery. - Mounted to the exterior of
gear case 4 isfan enclosure 30 withfan 20 sandwiched in between.Fan enclosure 30 andgear case 4 define between them a fan chamber 31.Fan 20 divides fan chamber 31 into a radially inward suction/inlet chamber 32 and a radially outward discharge/outlet chamber 33.Fan enclosure 30 also defines aslot 34, through which damper switch 29 projects, and anopening 35, through whichpulley portion 23 offan 20 projects. - Referring now to
FIG. 15 , air and dust pulled throughdust fan 20 exits discharge/outlet chamber 33 throughoutlet duct 36, which in the preferred embodiment is an integral portion offan enclosure 30. The downstream end ofduct 36 connects to the dust cassette 60 by means of alocking collar assembly 40. In the preferred embodiment, lockingcollar assembly 40 comprises acollar 42 movably mounted to the exterior ofduct 36. Collar 4A is movable between a first locked position, wherein it secures theinlet 61 of the dust cassette 60 to the outlet of theduct 36, and a second unlocked position, wherein the dust cassette is detachable from theoutlet duct 36. - The operation of the dust collection system will now be summarised.
Motor 10 drives drivenpulley 12 viadrive belt 14. In turn, drivenpulley 16 drivesdust fan 20 via fan belt is. Rotation ofdust fan 20 creates a suction that pulls air and dust from the vicinity of rear drive wheel 9 throughair passage 22 and intochamber 34. Withdamper 28 in the “ON” position, the air and dust is drawn throughopenings 26 anddamper 28 and acrossfan 20. The air and dust is exhausted from thefan 20 throughduct 36 and lockingcollar assembly 40 into the dust cassette 60. In the dust cassette 60 the dust is trapped while the air is filtered and exhausted across the air permeable sides. - If it is desired to disable the dust collection system, for example during outdoor use, this may be accomplished in two ways. First, the user may rotate the
suction damper 28 to the “OFF” position. In the OFF position thedust fan 20 will continue to turn, but will not produce a suction in the vicinity of the rear drive wheel 9. Alternatively, the user may temporarily removebelt cover 6 fromgear case 4, thus exposing thebelts Fan belt 18 may be removed from drivenpulley 16 andpulley portion 23 ofdust fan 20. Withfan belt 18 removed, thedust fan 20 will not be turned and no airflow will be produced in any portion of the dust collection path. - For cost effective and practical assembly,
dust fan enclosure 30 mounts to thegear case 4 over thesuction damper 28. Between theenclosure 30 anddamper 28 is aseal member 27. In the preferred embodiment shown inFIG. 14 seal member 27 is in the form of a flexible overmold bonded to thedamper 28. Theseal overmold 27 provides a sufficiently tight fit betweenenclosure 30 andamper 28 so as to limit air in leakage to the suction side offan 20, while permitting relative rotation between damper and enclosure. - With reference to
FIGS. 15 and 16 , in the preferred embodiment dust cassette 60 comprises afirst part 62 and asecond part 64.First part 62 is substantially funnel shaped as it expands from a small upstream/inlet end 61, connected to theexhaust duct 36 by means of thecollar assembly 40, to a larger rectangular shapeddownstream end 63.First part 62 is preferably semi-rigid, that is slightly flexible, so that it may be deformed for ease of installation and connection. In one preferred embodiment,first part 62 may be made of Santoprene® or another rubber-like material.Second pan 64 is an air permeable fabric skin over arigid frame 80. - Air and dust from the
dust fan 20 flows through theexhaust duct 36 into thefirst part 62 of dust cassette 60 and then into thesecond part 64 Dust is trapped inside the dust cassette 60, but the air is filtered through the air permeable sides ofsecond part 64 and thus exhausted. When the dust cassette 60 is substantially full of dust it can be quickly emptied by breaking theconnection 66 between thefirst part 62 and thesecond part 64. Depending on the circumstances, it may first be necessary to disconnect the entire dust cassette 60 from the sander at thecollar assembly 40. - With particular reference to
FIGS. 15-20 , the connection between the dust cassette 60 and the sander will be described in further detail.First part 62 of cassette 60 comprises aflexible clip 67 and aninlet end 61. To attach the dust cassette 60 to the sander,flexible clip 67 hooks onto and grips aflange 7 located on the rearward end ofbelt cover 6. Simultaneously,inlet end 61 is inserted into the lockingcollar assembly 40. The simultaneous alignment of theclip 67,flange 7, inlet end 6.1, and lockingcollar assembly 40 is made easier by the flexible material offirst part 62, which the user can deform in order to make the two connections. -
Inlet end 61 includes two protrudingribs 69. Withcollar 42 in the second/unlocked position,inlet end 61 is fit into thecollar assembly 40 so thatribs 69 are inserted through andpast cutouts 43 incollar 42 and fit intorecesses 38 defined in theoutlet end flange 37 of theoutlet duct 36.Collar 42, which slidably engagesend flange 37, can then be slid down to its first position, whereincollar 42traps ribs 69 withinrecesses 38, thus lockinginlet end 61 incollar assembly 40.Mating detent structures 39 onflange collar 42 restrain the collar in either of the locked or unlocked position, unless overcome by the force of the user deliberately moving the collar. - With particular reference to
FIG. 20 (wherein the dust cassette is shown inverted from its attached/in-use orientation), the construction of the dust cassette 60 will be described in greater detail. Thesecond part 64 of the dust cassette 60 is a dust bag/box constructed as an air permeable fabric stretched over arigid frame 80 in the known way. In the preferred embodimentsecond pant 64 is substantially a rectangular solid and open at oneside 65. Atopen end 65frame 80 defines opposedslots 82 on opposite sides of the open end and anupper lip 84. - The
downstream end 63 of first part 62 (shown in the facing view 20A) includes aflange 70 andflexible tabs 72. Ahook 74 is pivotably attached tofirst part 62 proximate to the downstream end. - To connect the parts of the dust cassette 60, the
flange 70 offirst part 62 is slid intoslots 82 offrame 80 of thesecond part 64 untilopen side 65 of the second part is aligned with thedownstream end 63 of the first part. When so aligned,flexible tabs 72 onfirst part 62 will detent underneathlip 84 of thesecond part 64 to secure the first part and second part together. Additional security is provided by thehook 74 onfirst part 62, which can be pivoted to engage alatch 86 on thesecond part 64. - Disconnecting of the two
parts hook 74, the user can squeeze and deformfirst part 62 so as to undo the detent betweentabs 72 andlip 84. Then flange 70 may be readily slid out ofslots 82. - While the invention has been described it the specification and illustrated in the drawings with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention as defined in the claims. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out this invention, but that the invention will include any embodiments falling within the foregoing description and the appended claims.
Claims (21)
1. An electrically powered belt sander comprising:
a housing;
a motor mounted in the housing at a first location and having an output shaft;
a fan rotatably mounted in the housing at a second location a distance from the motor output shaft; and
means for driveably connecting the motor output shaft to the fan.
2. An electrically powered belt sander comprising
a housing;
a motor mounted in the housing;
a dust flow path defined by the housing;
fan rotateably mounted in the dust flow path for creating air flow in the dust flow path; and
means for selectively blocking the dust flow path.
3. An electrically powered belt sander comprising:
a housing;
a motor mounted in the housing at a first location and having an output shaft;
a fan rotatably mounted in the housing at a second location a distance from the motor output shaft; and
a transmission connectable between the motor output shaft and the fan whereby the rotation of the motor output shaft drives the rotation of the fan.
4. The electrically powered belt sander of claim 3 wherein the transmission includes a pair of intermeshing gears for driving the fan in rotation.
5. The electrically powered belt sander of claim 3 wherein the transmission includes a belt for driving the fan in rotation.
6. The electrically powered belt sander of claim 3 further comprising:
a dust flow path defined by the housing; and
a damper located in the dust flow path and operable for blocking the dust flow path.
7. The electrically powered belt sander of claim 3 further comprising:
a first sanding belt roller rotateably mounted in the housing and having a first axis and;
a second sanding belt roller rotateably mounted in the housing and having a second axis substantially parallel to the first axis; and
wherein the first axis and the second axis lie in a plane, and the motor has an axis, which motor axis is substantially parallel to the first axis and lies approximately in the plane of the first and second axis.
8. The electrically powered belt sander of claim 3 wherein the transmission includes:
a drive pulley mounted on the motor output shaft;
a pulley mounted to the fan; and
a belt driveably connecting the drive pulley to the fan pulley.
9. The electrically powered belt sander of claim 3 wherein the transmission includes:
a drive pulley mounted on the motor output shaft;
a pulley mounted to the fan;
a third pulley;
a first belt driveably connecting the drive pulley to the third pulley; and
a fan belt driveably connecting the third pulley to the fan pulley.
10. The electrically powered belt sander of claim 3 wherein the fan is a radial fan.
11. The electrically powered belt sander of claim 6 wherein the damper is located on the suction side of the fan.
12. The electrically powered belt sander of claim 6 further including a flexible seal member attached to the damper.
13. The electrically powered belt sander of claim 6 wherein the damper is rotateable from a first position, wherein the dust flow path is blocked, to a second position, wherein the dust flow path is not blocked.
14. A method for interrupting the dust collection air flow of an electrically powered portable tool comprising the steps of:
providing a damper in the dust collection air flow path; and
moving the damper to a position in which the damper blocks the air flow path.
15. A method for interrupting the dust collection air flow of an electrically powered portable tool comprising the steps of:
providing a transmission between a motor and dust collection fan; and
disconnecting the transmission from one of the motor and the dust collection fan.
16. A dust receptacle lot an electrically powered portable tool comprising:
a first part connectable to the tool and including a flexible portion; and
a second part connectable to the first part.
17. The dust receptacle of claim 16 wherein the flexible portion includes a flexible clip for mounting the receptacle to the tool.
18. The dust receptacle of claim 16 wherein the flexible portion is made of a rubber-like material.
19. The dust receptacle of claim 16 wherein the second part includes a fabric covered dust collection volume.
20. A method for connecting a dust receptacle to a portable power tool comprising the steps of:
providing a dust receptacle with a flexible portion; and
deforming the flexible portion to align and engage the dust receptacle with the portable power tool
21. A powered portable tool comprising:
a housing defining a dust collection flow path, and including an outlet for the dust low path;
a detachable dust receptacle having an inlet connectable with the housing outlet; and
a locking mechanism movable between a first position, wherein the dust receptacle inlet and the housing outlet may be disconnected, and a second position wherein the dust receptacle inlet and the housing outlet are locked together.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/041,202 US20080153406A1 (en) | 2003-08-29 | 2008-03-03 | Dust collection system for a belt sander |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/652,181 US7338348B2 (en) | 2003-08-29 | 2003-08-29 | Dust collection system for a belt sander |
US12/041,202 US20080153406A1 (en) | 2003-08-29 | 2008-03-03 | Dust collection system for a belt sander |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/652,181 Continuation US7338348B2 (en) | 2003-08-29 | 2003-08-29 | Dust collection system for a belt sander |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080153406A1 true US20080153406A1 (en) | 2008-06-26 |
Family
ID=34104743
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/652,181 Expired - Fee Related US7338348B2 (en) | 2003-08-29 | 2003-08-29 | Dust collection system for a belt sander |
US12/041,202 Abandoned US20080153406A1 (en) | 2003-08-29 | 2008-03-03 | Dust collection system for a belt sander |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/652,181 Expired - Fee Related US7338348B2 (en) | 2003-08-29 | 2003-08-29 | Dust collection system for a belt sander |
Country Status (5)
Country | Link |
---|---|
US (2) | US7338348B2 (en) |
EP (3) | EP1704964B1 (en) |
CN (1) | CN1600498A (en) |
AT (2) | ATE464154T1 (en) |
DE (2) | DE602004005540T2 (en) |
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CN114559343A (en) * | 2022-01-26 | 2022-05-31 | 国网河南省电力公司焦作供电公司 | Cable insulation sander device and using method |
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Also Published As
Publication number | Publication date |
---|---|
ATE357994T1 (en) | 2007-04-15 |
DE602004005540T2 (en) | 2007-12-13 |
EP1704964B1 (en) | 2010-04-14 |
US7338348B2 (en) | 2008-03-04 |
EP1510291A1 (en) | 2005-03-02 |
CN1600498A (en) | 2005-03-30 |
DE602004005540D1 (en) | 2007-05-10 |
EP1510291B1 (en) | 2007-03-28 |
EP1704964A3 (en) | 2006-12-13 |
ATE464154T1 (en) | 2010-04-15 |
EP1704964A2 (en) | 2006-09-27 |
DE602004026638D1 (en) | 2010-05-27 |
US20050048883A1 (en) | 2005-03-03 |
EP1818139A1 (en) | 2007-08-15 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |