EP3648936A1 - Handkreissäge - Google Patents
HandkreissägeInfo
- Publication number
- EP3648936A1 EP3648936A1 EP18728144.9A EP18728144A EP3648936A1 EP 3648936 A1 EP3648936 A1 EP 3648936A1 EP 18728144 A EP18728144 A EP 18728144A EP 3648936 A1 EP3648936 A1 EP 3648936A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circular saw
- workpiece
- switching means
- base plate
- securing device
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
- B23D45/16—Hand-held sawing devices with circular saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
- B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws
Definitions
- the present invention relates to a circular saw with a base plate, a housing and an at least partially arranged in the housing drive unit, which is associated with a tool holder for a replaceable blade, wherein the drive unit is designed to rotate the replaceable saw blade about an associated axis of rotation, and wherein the portable circular saw can be guided along the workpiece by means of the foot plate.
- a saw designed as a circular saw circular saw which has a housing and a sectionally arranged in the housing drive unit.
- the drive unit is associated with a tool holder for a replaceable saw blade and the drive unit is designed for the rotary drive of the replaceable saw blade about an associated axis of rotation.
- DE 35 46 896 C2 further discloses a method for detecting an impending check-back condition in a motor-operated tool to increase safety at work.
- the method is based on detecting a percentage change in engine speed. This results in a sufficient sensitivity of the method at high speeds of the motor-driven tool and at low speeds, hypersensitivities are avoided.
- DE 10 2007 062 256 A1 further discloses a circular saw with a saw blade driven in rotation about a rotation axis and at least one first splitting wedge.
- An embodiment of the circular saw is in this case designed such in that, in order to increase safety at work, at least the first splitting wedge is automatically movable relative to the axis of rotation of the saw blade by means of a servomotor.
- the present invention provides a circular saw with a base plate, a housing and an at least partially arranged in the housing drive unit, which is associated with a tool holder for a replaceable blade, wherein the drive unit is designed to rotate the exchangeable saw blade about an associated axis of rotation, and wherein the circular saw is guided by the foot plate on a workpiece along.
- a securing device is provided with at least one sensor element, wherein the securing device is adapted to detect at least one occurring during a sawing collapse of the circular saw into the workpiece and to decelerate and / or disable the drive unit in a detection of an occurring collapse into the workpiece ,
- the invention thus enables a reliable detection of a collapse of the portable circular saw in the workpiece and hereby preferably an immediate braking and / or switching off the drive unit.
- occupational safety can be significantly increased.
- the securing device the end of a saw cut and a kick, or a s.g. "Kick-back", i. a jamming of the saw blade in the workpiece, reliably detectable.
- the term "break-in” is understood to mean at least partial breaking or breaking of the workpiece outside the saw cut produced by means of the circular saw in the workpiece.
- the security device can also be configured as a retrofit kit for conventional standard circular saws or other sawing devices.
- the sensor element preferably has at least one acceleration sensor.
- the sensor element preferably has at least one rotational speed sensor.
- a particularly simple structure of the necessary sensors is given.
- the sensor element has at least one electromechanical and / or one electronic switching means.
- the sensor element has at least one electromechanical and / or one electronic switching means.
- the at least one switching means is arranged on a workpiece facing contact surface of the base plate in the region of a rectangular passage opening of the saw blade. As a result, a reliable detection of any collapse of the circular saw is possible.
- the at least one switching means extends at least in sections in the region of at least one narrow side and / or at least in sections in the region of at least one longitudinal side of the passage opening.
- the at least one switching means is L-shaped, U-shaped or rectangular.
- the at least one switching means comprises the passage opening like a frame.
- the at least one switching means terminates flush with its abutment surface on the base plate resting against the workpiece and, when the base plate is lifted off the workpiece, it springs out from the latter.
- the at least one switching means on a spring-loaded rocker or pressure plate, which in particular for actuating an electric
- the switching means can optionally provide a digital or analog signal for evaluation by means of a control device of the security device.
- the at least one sensor element has an optical detector.
- the at least one optical detector is arranged flush in a workpiece facing contact surface of the base plate in the region of a passage opening of the saw blade. As a result, the detection takes place in the immediate vicinity of the saw cut.
- the contact surface has at least one depression for forming a surface measuring zone, wherein the at least one optical detector is arranged in the at least one depression.
- the at least one optical detector is formed with an optical reflex sensor.
- an optical reflex sensor e.g., a structurally particularly compact design.
- the security device preferably has a control unit.
- the digital or analog signals supplied by the at least one sensor element can be comprehensively evaluated for detecting the collapse of the portable circular saw and for switching off the drive unit.
- the control unit can be realized, for example, with a microcomputer embodied as an integrated circuit or the like.
- Fig. 1 is a schematic side view of a circular saw with a securing device
- Fig. 2 is a schematic representation of the circular saw of Fig. 1 with a first
- FIG. 3 shows a diagram of a speed curve detected by a second embodiment of a safety device for detecting a break-in process
- FIG. 4 is a partial plan view of a base plate of the portable circular saw of Fig. 1 with a third embodiment of a securing device
- FIG. 5 shows a partial plan view and a partial side view of the base plate of the circular saw of FIG. 1 with a fourth embodiment of a securing device
- FIG. 6 shows a partial plan view and a partial side view of the base plate of the circular saw of FIG. 1 with a fifth embodiment of a securing device
- FIG. 7 shows a partial plan view and a partial side view of the base plate of the portable circular saw of FIG. 1 with a sixth embodiment of a securing device, FIG.
- FIG. 8 is a schematic front view of the portable circular saw of FIG. 7 when it breaks into the workpiece, FIG.
- FIG. 9 is a partial plan view of the base plate of the portable circular saw of Fig. 1 with a seventh embodiment of a securing device
- FIG. 10 is a partial plan view and a partial side view of the base plate of the portable circular saw of Figure 1 with an eighth embodiment of a securing device.
- 1 1 is an enlarged view of a section XI of Fig. 10,
- FIG. 12 is a partial plan view of the base plate of the portable circular saw of Figure 1 with a ninth embodiment of a securing device
- FIG. 13 is a partial plan view of the base plate of the circular saw of FIG. 1 with a tenth embodiment of a securing device
- FIG. 1 shows an example of a hand-held power tool 100 designed as a portable circular saw 100.
- the latter is preferably associated with an electromotive drive unit 120, which is arranged at least in sections in a housing 110.
- the housing 1 10 is preferably provided with an ergonomic handle 1 12 for a user.
- the drive unit 120 preferably serves to drive a tool holder 140 for a replaceable saw blade 130.
- the drive unit 120 is designed, in particular, to rotate the exchangeable saw blade 130 about an associated axis of rotation 142.
- the saw blade 130 is preferably formed as a circular saw blade 132 with a toothed cutting edge 134.
- the portable circular saw 100 is connected to the mains-dependent power supply mechanically and electrically connected to a mains connection 1 18, but could additionally or alternatively be equipped with a battery pack for the mains-independent power supply.
- the portable power tool 102 can also be designed as a table saw, immersion saw, saber saw or as any other power tool with a rotating and / or at least substantially linearly oscillating saw blade.
- the housing 1 10 of the portable circular saw 100 has a first end 1 14 and a second end 1 16 directed away from the first end 14.
- the Circular saw 100 is provided here for sawing in a direction 150.
- the circular saw 100 is preferably provided with an at least substantially planar, preferably rectangular foot plate 122.
- the foot plate 122 has a contact surface 124 directed away from the drive unit 120, with the aid of which the circular saw 100 can be guided, for example, along an at least substantially flat upper side 154 of a workpiece 160 indicated here merely by a dotted line.
- the saw blade 130 penetrates the workpiece 160 usually completely and therefore at least partially exits in the region of an underside 156 of the workpiece 160 from this.
- the circular saw 100 typically has an optional swing guard.
- Corresponding pendulum protection hoods are well known from the relevant prior art, which is why for the sake of simplicity and conciseness of the description is dispensed with a detailed description of the optional swing guard.
- a securing device 170 is integrated in the circular saw 100, preferably to further increase safety at work, by means of which inter alia a collapse of the circular saw 100 in the workpiece 160 detected and the drive unit 120 timely or immediately switched off and / or at least partially decelerated. Furthermore, by means of the securing device 170, if appropriate, the end of a saw cut to be executed and a jamming of the saw blade 130 can be detected, whereby the jamming of the saw blade 130 can lead to a dangerous, so-called "kick-back" or kickback.
- the drive unit 120 is preferably to increase the occupational safety for the user or user controlled by the securing device 170 preferably without delay off. In the case of the detection of the she Randes also an at least partial deceleration of the drive unit 120 may be provided.
- FIG. 2 shows the circular saw 100 of FIG. 1 with a first embodiment of the securing device 170 when breaking into a workpiece 200.
- the circular saw 100 is illustratively guided on a workpiece 200 for producing a saw cut 202, wherein the workpiece 200 is exemplarily mounted on a first and a second abutment 204, 206 cantilevered, which are spaced from each other on a substrate 208 are arranged.
- the two abutments 204, 206 may be, for example, bearing blocks or the like.
- the sudden breaking in of the circular saw 100 into the workpiece 200 in the region of the saw cut 202 results in a first and a second fragment 210, 212.
- the first embodiment of the securing device 170 has a sensor element 214, which is realized here by way of example with a preferably electronic acceleration sensor 216.
- a sensor element 214 which is realized here by way of example with a preferably electronic acceleration sensor 216.
- the acceleration sensor 216 at least the linear acceleration of the portable circular saw 100 can be detected in the direction of a z-axis of a rectangular coordinate system 220 or in the direction of the bottom 208 in order to detect the breaking process of the circular saw 100 schematically illustrated here in the workpiece 200 with high reliability .
- Due to the collapse of the circular saw 100 in the workpiece 200 a significant acceleration occurs primarily in the direction of the z-axis of the coordinate system 220 and in the direction of the subsurface 208 g z, which is detected by means of the acceleration sensor 216 and for evaluation of the safety device 170 becomes.
- the drive unit 120 of FIG. 1 By means of the securing device 170, the drive unit 120 of FIG. 1, not shown here for the sake of better graphical clarity, can then be switched off and / or at least partially braked when a predetermined limit value for the acceleration g z is exceeded, whereby the occupational safety for the user of the portable circular saw 100 in FIG Fall of burglary can be considerably increased.
- the securing device 170 may include further, not shown, acceleration sensors, in order to also the other linear acceleration components g x , y of the circular saw 100 in Direction of an x-axis and / or a y-axis of the three-dimensional orthogonal coordinate system 220 to detect and enable by means of the securing device 170, a more precise detection of a break-in operation of the circular saw 100 in the workpiece 200.
- the securing device 170 can have at least one gyro sensor or an electronic spin sensor, not shown for better clarity, as an additional sensor element, in addition to any rotational accelerations of the circular saw 100 about at least one of the three axes of the coordinate system 220 and thus tilting movements of the circular saw 100 capture and evaluate by the securing device 170.
- FIG. 3 shows a diagram of a speed curve detected by a second embodiment of a fuse device for detecting a break-in process.
- the latter has at least one rotational speed sensor for detecting a current rotational speed of the drive unit or of the saw blade driven by it (see reference numerals 120, 130, FIG.
- the speed sensor can be realized for example by means of a permanent magnet and a Hall sensor or reed contact, or on an optical basis.
- the diagram illustrates the rotational speed of the current rotational speed of the saw blade or the drive unit of the portable circular saw determined by the rotational speed sensor and transmitted to the safety device for evaluation on the basis of a first curve 250 shown in a solid line and a second curve 252 shown in FIG Depending on the progress of the saw, the speed on the vertical axis and the sawing progress of the circular saw through the workpiece are plotted on the horizontal axis.
- the drive unit of the circular saw is idle, that is, the saw blade rotates freely with the usual idle speed.
- the saw blade penetrates increasingly into a to be sawn
- the first curve 250 increases significantly more slowly compared to its falling at the start of sawing in the second region 256, which indicates a delayed speed increase of the saw blade as it exits the workpiece until the idling speed is restored.
- an abrupt, comparatively steep rise of the second curve 252 or the rotational speed of the saw blade takes place, which is a clear inference to a collapse of the
- Hand circular saw in the workpiece allows.
- the sudden increase in rotational speed 264 that can be measured immediately after the collapse is evaluated by the safety device and serves as a clear signal for switching off and / or for at least partially braking the drive unit of the saw blade when a break-in process occurs.
- a clutch in normal sawing is present and can be detected by means of the speed sensor, when the speed increase of the drive unit with the course of the second curve 250 in the fourth region 260 of the diagram corresponds, so that the safety device optionally
- the securing device can likewise prompt the immediate switching off and / or at least partial braking of the drive unit of the portable circular saw.
- 4 shows a foot plate 122 of the circular saw 100 of FIG. 1 with a securing device 300 according to a third embodiment.
- the securing device 300 of the circular saw 100 preferably comprises a sensor element 302, which is constructed here merely by way of example with a rectangular, electromechanical and / or electronic switching means 304.
- the saw blade 130 of the circular saw 100 passes through a rectangular passage opening 306 of the base plate 122, wherein the passage opening 306 has a first and a second narrow side 308, 310, and a first and a second longitudinal side 312, 314.
- the circular saw 100 moves in this case in the direction of work 150 in relation to the workpiece, not shown here.
- the switching means 304 is preferably formed flush with the workpiece facing contact surface 124 of the base plate 122 and extends at least in sections along and slightly spaced and parallel to the second longitudinal side 314 of the passage opening 306 for the saw blade 130th
- the switching means 304 may, for example, be realized with a spring-loaded rocker 316 or with a spring-loaded pressure plate 318, which in the simplest case is e.g. are coupled to an electrical contact 320 and / or a strain gauges 322 whose signals are then each supplied to a control device 330 within the securing device 300.
- the electrical contact 320 may be, for example, a simple electromechanical closer, an opener or a change-over contact which can be actuated by a feeler or switch.
- the switching means 304 preferably springs out of the plane of the contact surface 124 of the base plate 122 in the direction of the workpiece to be sawn, so that the electrical contact 320 and / or the strain gauge 322 preferably provides a clear electrical signal deliver, which can be evaluated by a controller 330 of the securing device 300.
- the security device 300 preferably switches off the drive unit 120 of FIG. 1 of the portable circular saw 100 and / or at least partially decelerates it.
- Switching means 304 also have a permanent magnet, not shown, which responds to a rebreathing in the case of breaking of the circular saw 100, a magnetic sensor such as a Hall sensor, a reed contact or the like without contact or releases.
- the signal generated by the magnetic sensor is then preferably again used to switch off and / or at least partially decelerate the drive unit 120 of FIG. 1 of the portable circular saw 100 by means of the securing device 300.
- a second, not shown here electromechanical and / or electronic switching means may be provided in the region of the first longitudinal side 312 of the passage opening 306, which is constructed identically to the first switching means 304 structurally.
- the switching off and / or the at least partial braking of the drive unit 120 of FIG. 1 by the securing device 300 can take place in such a constellation, for example, if both switching means in a possible breaking process of the circular saw 100, the mechanical contact with the then resulting two fragments of Lose workpiece.
- FIG. 5 illustrates the base plate 122 of the portable circular saw of FIG. 1 with a securing device 350 according to a fourth embodiment.
- the saw blade 130 again passes through the passage opening 306 of the base plate 122 of the portable circular saw 100.
- the securing device 350 of the circular saw 100 preferably again comprises a sensor element 352 which is preferably completely flush with the contact surface 124 of the base plate 122 of the portable circular saw 100, corresponding to the embodiment of FIG is constructed with an electromechanical and / or electronic switching means 354.
- the switching means 354 preferably has a shape deviating from the rectangular shape, at least substantially U-shaped geometry with a first and a second leg 356, 358, which are connected by a base portion 360.
- the two Legs 356, 358 of the switching means 354 are in this case preferably oriented opposite to the working direction 150, while the base portion 360 lies in the working direction 150.
- the switching means 354 is also preferably formed symmetrically to a center plane 362 of the saw blade 130, which is generally perpendicular to the base plate 122 and closes in the event that the contact surface
- the two legs 356, 358 of the U-shaped switching means 354 preferably extend at least in sections and in each case slightly spaced along the two longitudinal sides 312, 314 of the passage opening 306, while the base section 360 preferably extends beyond the first narrow side 308 of the passage opening 306 and slightly spaced from this runs.
- the switching means 354 is preferably released from the workpiece 200 and springs, as indicated by the double arrow 364, preferably out of the contact surface 124 of the base plate 122 and generates a corresponding electrical signal within the securing device 350 so that they Disconnect drive unit 120 of FIG. 1 of the circular saw 100 and / or at least partially decelerate. If the circular saw 100 is again brought to rest against the workpiece 200, then the switching means 354 preferably again springs as far into the base plate 122 that in the
- U-shaped switching means 354 a second, not shown here U-shaped switching means may be provided which is mirror images of the axis of rotation 142 of the saw blade 130 with respect to the switching means 354 integrated into the base plate 122 of the portable circular saw 100. Otherwise, the
- FIG. 6 shows the foot plate 122 of the circular saw 100 of FIG. 1 with a securing device 400 according to a fifth embodiment.
- the circular saw 100 with the securing device 400 is preferably guided by the foot plate 122 along the workpiece 200 in the working direction 150.
- the saw blade 130 passes through the passage opening 306.
- a sensor element 402 of the securing device 400 is preferably in turn constructed with an electromechanical and / or electronic switching device 404 which, in contrast to FIGS However, the above embodiments limited in the area of the first
- Narrow side 308 of the passage opening 306 is positioned and which has a rectangular shape with a comparatively small area.
- the switching means 404 preferably springs out of the contact surface 124 of the foot plate 122 and during overflow or during contact with the workpiece
- the switching means 404 preferably springs into a position which is completely flush with the contact surface 124, wherein the two possible positions of the switching means are illustrated by the double arrow 406.
- a further rectangular sensor element 408 may be placed, which is realized with a spring-loaded switching means 410 and its structural design and operation corresponds to that of the switching means 404.
- the unloaded switching means 410 at least partially springs out of the contact surface 124 of the foot plate 122 and is at
- FIG. 7 shows the foot plate 122 of the circular saw 100 of FIG. 1 with a securing device 450 according to a sixth embodiment.
- the circular saw 100 with the passage opening 306 passing through the saw blade 130 moves along the workpiece not shown here again in the working direction 150th
- the securing device 450 has a sensor element 452, which is preferably formed with a frame-like, spring-loaded electronic and / or electromechanical switching means 454, which preferably surrounds the passage opening 306 slightly spaced on all sides or surrounds like a frame. In the unloaded state of the switching means 454 this springs preferably from the investment surface 124 of the foot plate 122 out, while it rebounds when planting on the workpiece, not shown here, as indicated by the double arrow 456, preferably again to flush completion with the contact surface 124 in the base plate 122 of the portable circular saw 100.
- the switching means 454 preferably springs out of the foot plate 122 and the securing device 450 switches off the drive unit 120 of FIG. 1 of the portable circular saw 100 immediately and / or brakes it at least partially.
- a first and a second longitudinal side 458, 460 of the switching means 454 in this case are significantly narrower than a first and a second narrow side 462, 464 of the switching means 454th
- the function of the securing device 450 substantially corresponds to the embodiment variants of securing devices already described above, so that reference is made to the relevant description sections for the purpose of conciseness of the description at this point.
- FIG. 8 shows the circular saw 100 according to FIG. 7 when it breaks into the workpiece 200 of FIG. 5.
- the circular saw 100 is guided by means of the abutment surface 124 of the foot plate 122 along an upper side 466 of the workpiece 200 to carry out a desired saw cut.
- the spring-loaded frame-like switching means 454 of FIG. 7 preferably terminates flush with the contact surface 124 of the base plate 122 of the portable circular saw 100.
- the switching means 454 preferably from the top 466 of the still intact workpiece 200 against the spring action of the switching means 454, which is anxious to lift this out of the base plate 122, acted upon in the direction of the arrows 468, 470.
- the two fragments 210, 212 are formed from the initially intact workpiece 200, whereby the mutual contact between the workpiece 200 and the frame-like switching means 454 is lost, so that the switching means 454 of the securing device 450 are preferably out the contact surface 124 of the foot plate 122 springs out.
- the drive unit 120 of the circular saw 100 is again switched off in a controlled manner by the securing device 450 and / or at least partially decelerated.
- 9 shows the foot plate 122 of the circular saw 100 of FIG. 1 with a securing device 500 according to a seventh embodiment. The foot plate 122 the circular saw 100 is in turn moved in relation to a workpiece, not shown here in the working direction 150.
- the securing device 500 preferably comprises a first sensor element 502, which is here formed with an at least substantially L-shaped, first electromechanical and / or electronic switching means 504.
- a longitudinal leg 506 of the first switching means 504 extends at least partially along, as well as slightly spaced, the first longitudinal side 312 of the passage opening 306, while a relative to the longitudinal leg 506 wider dimensioned short leg 508 slightly spaced parallel to the first narrow side 308 of the passage opening 306 for the saw blade 130th runs.
- the security device features
- a second sensor element 510 which is realized here with a substantially rectangular, electromechanical and / or electronic switching means 512.
- the second, at least substantially elongated, rectangular switching means 512 extends in this case at least in sections along, and slightly spaced, the second longitudinal side 314 of the passage opening 306.
- a first end portion 514 of the second switching means 512 terminates flush with the narrow side 308 of the passage opening 306, while a second second end section 516 leading away from the first end section 514 terminates slightly in front of the second narrow side 310 of the passage opening 306 and preferably flush with the longitudinal leg 506 of the first switching device 504.
- Switching means 504, 512 lifts off from the contact surface 124 of the base plate 122 in order to trigger the immediate shutdown of the drive unit and / or the at least partial deceleration of the drive unit 120 of FIG. 1 by the securing device 500.
- FIG. 10 shows the foot plate 122 of the portable circular saw 100 of FIG. 1 with a securing device 550 according to an eighth embodiment.
- the base plate 122 of the circular saw 100 moves again in relation to a workpiece, not shown here in the working direction 150.
- the securing device 550 preferably comprises a first sensor element 552, which in turn with an at least substantially L-shaped first electromechanical and / or electronic switching means 554 is formed.
- the switching means 554 has a longitudinal leg 556, which extends in sections and slightly spaced from the first longitudinal side 312 of the passage opening 306 for the saw blade 130.
- the switching means 554 has a right-angled to the longitudinal leg 556 formed short leg 558, which is slightly spaced and extends beyond the first narrow side 308 of the passage opening 306 addition.
- a second sensor element 560 is preferably constructed with an at least substantially L-shaped, second electromechanical and / or electronic switching means 562.
- the second switching means 562 also has a longitudinal leg 564, which extends at least in sections and slightly spaced from the second longitudinal side 314 of the passage opening 306.
- a short leg 566 of the second switching means 562 extends only partially and slightly spaced along the second narrow side 310 of the passage opening 306 in the base plate 122 of the portable circular saw 100.
- Each of the two, in turn spring-loaded switching means 554, 562, preferably springs as indicated by the two double arrows 568, 570 without workpiece contact from the contact surface 124 of the base plate 122 and is in the system of the foot plate 122 to the workpiece, not shown here again preferably completely flush pushed back into the base plate 122.
- L-shaped switching means around the passage opening 306 of the base plate 122 may be circumferentially grouped around, wherein between each two circumferentially immediately adjacent switching means each a small distance remains (see, for this purpose, the geometric arrangement of the four L-shaped depressions of FIG. 13).
- the longitudinal leg 556 of the first switching means 554 terminates preferably just before the second narrow side 310 of the passage opening 306 in the base plate 122 for the saw blade 130 of the circular saw 100.
- the longitudinal leg 564th of the second switching element 562 preferably includes the short leg 566 at right angles, wherein the inner edge 572 is substantially parallel and flush with the median plane 362 of the saw blade 130, as indicated by the arrows 574, 576 extends.
- the switching means 554, 562 preferably again terminate flush with the abutment surface 124 of the base plate 122 of the portable circular saw 100.
- FIG. 12 shows the base plate 122 of the portable circular saw 100 of FIG. 1 with a securing device 600 according to a ninth embodiment.
- the base plate 122 of the circular saw 100 moves along the workpiece not shown here in the working direction 150.
- the saw blade 130 passes through the
- the securing device 600 here preferably comprises, by way of example only, six sensor elements, of which only one sensor element 602 is representative of all the others for the sake of better graphical clarity. Each of the six sensor elements is preferably formed with a non-contact optical detector 604, 606, 608, 610, 612, 614.
- the rather point-like optical detectors 604 to 614 are preferably circumferentially approximately uniformly spaced around the rectangular passage opening 306 grouped and in this case preferably flush with the contact surface 124 of the base plate 122 admitted. A different number and grouping of the optical detectors 604 to 614 is also possible.
- the optical detector 604 is located here only as an example in the middle in the region of the first narrow side 308 of the passage opening 306, while the optical see detector 610 in the region of the second narrow side 310 of the passage opening 306 is positioned.
- the optical detectors 606, 608 and 612, 614 are preferably arranged in pairs in the region of the two longitudinal sides 312, 314 of the passage opening 306 in the base plate 122 for the saw blade 130.
- the optical detectors 604 to 614 are preferably darkened and the portable circular saw
- each of the optical detectors 604 to 614 at least briefly illuminated by the ambient light and the fuse device 600 causes due to this defined evaluable, temporal brightness transition immediate shutdown and / or at least partially decelerating In principle, it is sufficient to provide one of the optical detectors 604, 610, at least on the two narrow sides 308, 310 of the passage opening 306, in each case one of the optical detectors 604, 610.
- the reliability of the burglary detection can be further optimized by means of the securing device 600.
- the detectors 604 to 614 can be realized, for example, with passive optical elements which themselves emit no electromagnetic radiation, but respond only to the external ambient radiation.
- passive optical elements which themselves emit no electromagnetic radiation, but respond only to the external ambient radiation.
- photoresistors, photodiodes, phototransistors or the like may be used in this connection.
- active optical elements such as so-called optical reflex sensors, etc. may be used, which emit electromagnetic radiation itself, which is situationally reflected from the workpiece and then evaluated by the reflex sensor.
- the radiation emitted by the optical elements can be modulated to further optimize the noise immunity.
- FIG. 13 shows the base plate 122 of the portable circular saw 100 of FIG. 1. with a securing device 650 according to a tenth embodiment.
- the base plate 122 of the circular saw 100 moves again along the workpiece not shown here in the working direction 150.
- the saw blade 130 with the middle plane 362 passes through the passage opening 306 of the foot plate 122.
- the securing device 650 here comprises four sensor elements by way of example For better illustrative sake, only one sensor element 652 is representative of all the others.
- the four sensor elements are preferably formed to form a flat measuring zone 654, inter alia, each having a first, second, third and fourth each L-shaped recess 656, 658, 660, 662 of the base plate 122 of the circular saw 100.
- the four depressions 656 to 662 preferably each have an at least substantially rectangular-shaped cross-sectional geometry.
- the two L-shaped depressions 656, 658 and the two L-shaped depressions 660, 662 are in each case positioned in mirror image to the center plane 362 of the saw blade 130 and the two L-shaped depressions 658, 660 and the two L-shaped depressions 656, 662 are in turn each mirror image of a perpendicular to the center plane 362 of the saw blade 130 extending center line 664 of the passage opening 306 inserted into the base plate 122.
- the four recesses 656, 658, 660, 662 are thus arranged point-symmetrically with respect to an intersection 666 between the center line 664 of the passage opening 306 and the median plane 362, wherein between each two peripherally directly adjacent depressions 656, 658, 660, 662 a narrow, the better graphic overview half unnamed distance remains.
- each of the exemplary only four L-shaped depressions 656, 658, 660, 662 is preferably at least one, not shown here, optical detector installed.
- the optical detectors are in this case preferably in the wells 656, 658, 660, 662 mounted so that they do not protrude beyond the contact surface 124 of the base plate 122, but at most flush with the contact surface 124 of the base plate 122, thereby providing a full-scale plant the ideal Foot plate 122 is ensured on the workpiece to be sawn (see reference numeral 200, Fig. 14).
- the securing device 650 immediately shuts off and / or at least partially decelerates the drive unit 120 in response to this signal of Fig. 1 of the circular saw 100 can cause injury to protect the user.
- L-shaped geometry of the recesses 656, 658, 660, 662 deviating shapes and a larger and / or smaller number of recesses 656, 658, 660, 662 within the
- Foot plate 122 of the circular saw 100 may also be provided.
- Fig. 14 shows a partial cross-section along section line XIV-XIV of Fig. 13.
- an optical detector 670 here merely exemplified as an active one optical reflex sensor 672 is configured.
- an optical reflex sensor actively emits electromagnetic radiation which is reflected by the workpiece 200.
- This electromagnetic radiation optionally reflected by the workpiece 200, then falls, for example, onto a photodiode or a phototransistor integrated in the optical reflex sensor, whose signal is then further amplified by the safety device 650 and evaluated, for example, for detecting a break-in operation of the portable circular saw 100 into the workpiece 200 .
- the electromagnetic radiation emitted by the optical reflex sensor may, for example, be in the spectral range visible to the human eye or in the adjacent, near infrared range.
- the workpiece 200 here only partially covers the recess 656 in the base plate 122 of the circular saw 100, so that the electromagnetic radiation emitted by the optical reflex sensor 672 is at most partially reflected and the optical reflex sensor 672, for example, does not output a relevant electrical signal.
- Drive unit of the circular saw 100 triggers. However, it covers the workpiece 200 For example, if the depression 656 is substantially completely off, the electromagnetic radiation emitted from the optical reflection sensor 672 is almost completely reflected from the workpiece 200 to the optical reflection sensor 672, for example, outputting a signal indicative of the normal sawing operation for the protection device 650.
- the optical detector 670 can also be realized with a purely passive acting optical element, such as a photoresistor, a photodiode, a phototransistor or the like, which alone the incoming electromagnetic radiation from the environment registered and outputs a corresponding electrical signal.
- the mode of operation of the optical detector 670 then corresponds to the mode of operation of the passive optical detectors already described in connection with FIG. 12, so that for the sake of brevity the description at this point refers to the explanations already given there.
- at least one radar sensor can also be used to detect the incidence of the circular saw 100 in the workpiece 200.
- the sensor elements mentioned in the above description of the various embodiments of the securing devices in particular the linear acceleration sensors, the spin sensors (Gyrossensoren), the speed sensor, the electromechanical and / or electronic switching means and the passive or active optical detectors are combined in any number and / or in any desired manner.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017211270.0A DE102017211270A1 (de) | 2017-07-03 | 2017-07-03 | Handkreissäge |
PCT/EP2018/064184 WO2019007593A1 (de) | 2017-07-03 | 2018-05-30 | Handkreissäge |
Publications (1)
Publication Number | Publication Date |
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EP3648936A1 true EP3648936A1 (de) | 2020-05-13 |
Family
ID=62455505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18728144.9A Withdrawn EP3648936A1 (de) | 2017-07-03 | 2018-05-30 | Handkreissäge |
Country Status (5)
Country | Link |
---|---|
US (1) | US20210323189A1 (de) |
EP (1) | EP3648936A1 (de) |
CN (1) | CN110869178A (de) |
DE (1) | DE102017211270A1 (de) |
WO (1) | WO2019007593A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018216544A1 (de) * | 2018-09-27 | 2020-04-23 | Robert Bosch Gmbh | Vorrichtung und Verfahren zur sicheren Ablaufsteuerung einer Handwerkzeugmaschine |
DE102018216933A1 (de) * | 2018-10-02 | 2020-04-02 | Festool Gmbh | Elektrowerkzeug |
DE102019211894A1 (de) * | 2019-08-08 | 2021-02-11 | Robert Bosch Gmbh | Bremsvorrichtung einer Kettensäge und Verfahren zum Schutz eines Bedieners |
CN218452649U (zh) * | 2019-12-20 | 2023-02-07 | 米沃奇电动工具公司 | 往复锯 |
JP2024509079A (ja) * | 2021-02-19 | 2024-02-29 | フェストール・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | 被加工物を切断するための丸鋸の使用時に定置式ベース構造に対して移動する刃を備えた丸鋸、及びそのような丸鋸のキックバック状態の検出方法 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3548276A (en) * | 1969-02-17 | 1970-12-15 | Thomas A O Gross | Dynamic braking of universal motors |
US3628112A (en) * | 1970-06-01 | 1971-12-14 | Thomas A O Gross | Dynamic braking of electric motors with load changing during braking |
US3794898A (en) * | 1973-02-26 | 1974-02-26 | T Gross | Dynamic braking of electric motors with thermistor braking circuit |
DE2755401A1 (de) * | 1977-12-13 | 1979-06-21 | Bosch Gmbh Robert | Anordnung zum absenken der leerlaufdrehzahl eines elektromotors |
DE3546896C2 (de) | 1984-03-23 | 1996-02-08 | Black & Decker Inc | Verfahren zum Erkennen eines drohenden Rückschlagzustandes bei einem motorisch betriebenen Werkzeug |
AU4334699A (en) * | 1998-06-05 | 1999-12-20 | Milwaukee Electric Tool Corporation | Braking and control circuit for electric power tools |
US7481140B2 (en) * | 2005-04-15 | 2009-01-27 | Sd3, Llc | Detection systems for power equipment |
DE102007062256A1 (de) | 2007-12-21 | 2009-06-25 | Robert Bosch Gmbh | Kreissäge |
JP5214423B2 (ja) * | 2008-12-10 | 2013-06-19 | 株式会社マキタ | 電動工具 |
JP2011020205A (ja) * | 2009-07-15 | 2011-02-03 | Hitachi Koki Co Ltd | 携帯用切断機 |
DE102009035134A1 (de) * | 2009-07-29 | 2011-02-03 | Festool Gmbh | Hand-Werkzeugmaschine |
DE102009054491A1 (de) * | 2009-12-10 | 2011-06-16 | Robert Bosch Gmbh | Überwachungsvorrichtung einer Werkzeugmaschine |
DE102011089343A1 (de) * | 2011-12-21 | 2013-06-27 | Robert Bosch Gmbh | Handwerkzeugmaschine |
US20140166323A1 (en) * | 2012-09-16 | 2014-06-19 | J. Carl Cooper | Kickback Reduction for Power Tools and Machines |
DE202014003111U1 (de) * | 2014-04-11 | 2014-07-25 | Brt Engineering & Consulting Gmbh | Schutzvorrichtung für Band- und Kreissägen |
CN107000087B (zh) * | 2014-09-25 | 2019-12-03 | 罗伯特·博世有限公司 | 基于动力工具中的刀片速度进行回踢检测的系统和方法 |
-
2017
- 2017-07-03 DE DE102017211270.0A patent/DE102017211270A1/de not_active Withdrawn
-
2018
- 2018-05-30 US US16/625,572 patent/US20210323189A1/en not_active Abandoned
- 2018-05-30 WO PCT/EP2018/064184 patent/WO2019007593A1/de unknown
- 2018-05-30 CN CN201880044767.0A patent/CN110869178A/zh active Pending
- 2018-05-30 EP EP18728144.9A patent/EP3648936A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2019007593A1 (de) | 2019-01-10 |
CN110869178A (zh) | 2020-03-06 |
DE102017211270A1 (de) | 2019-01-03 |
US20210323189A1 (en) | 2021-10-21 |
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