EP2483041A1

EP2483041A1 - Stop device for a portable machine tool

Info

Publication number: EP2483041A1
Application number: EP10743119A
Authority: EP
Inventors: Milan Bozic; Siegfried Fehrle
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2009-09-30
Filing date: 2010-08-16
Publication date: 2012-08-08
Also published as: CN102069483B; CN102548720A; DE102010030739A1; RU2012117573A; DE202009013147U1; CN102069483A; WO2011038979A1; DE102010030744A1

Abstract

The invention relates to a stop device, particularly a depth stop (280), for a rotationally driven, particularly oscillatingly driven, chipping or cutting, round and/or angular disc shaped tool (22, 220) of a portable machine tool, particularly a saw blade, by means of which a cut (92) can be produced in a workpiece (90) in a chipping manner, comprising a disc-like means that is arranged axially adjacent to the tool (22, 220), preferably axially supported thereon, and exposes opposite the outer edge thereof (290) a certain part of the tool (22) for penetration into the cut (92) by a defined degree and prevents further penetration into the cut (92) beyond the defined degree, as soon as the edge (290) is supported on the tool (90). According to the invention, the disc-shaped tool (22, 220) is crucible-shaped and the stop device, particularly the depth stop (280), is also similarly designed so as to be precisely crucible-shaped, wherein the depth stop (280) enters a concave crucible-shaped region of the tool (22, 220) and/or vice versa, it receives the tool (22, 220) in an axially supporting manner in the concave crucible-shaped region thereof.

Description

Description title

Stop device for a hand tool state of the art

The present invention relates to a stop device, in particular a depth stop, for a tool of a hand tool and a hand tool, in particular a hand tool with an oscillating drive shaft, according to the preamble of claim 1 and claim 9 of the present application.

A generic hand tool is known with rotating, in particular oscillating drivable, cutting or cutting, round and / or square disc-shaped tool, in particular saw blade, with the cutting a kerf in a workpiece is produced, the tool with its radially inner portion with the driver having acting inner flange of the output shaft, wherein the radially inner region of the tool arranged a plurality of pitch circles as entrainment or depressions as engagement means for the positive, backlash-free engagement in a plurality of mandrel-like, arranged on a same pitch circle of the driver projections.

This entrainment system only allows the use of tools with a number of entrainment openings corresponding exactly to the number of projections. So far, tools with a different number of driving openings not on the o. G. Driver or on this hand tool machine tensioned or used.

The same applies to the previous, disc-like, flat depth stop according to DE 10 2008 001 234 AI, which is not readily on the above driver with preferably twelve projections can be stretched or used and also not suitable for use with cranked tools.

Disclosure of the invention

With the invention according to the features of claim 1 a generic stop device, in particular depth stop for a hand tool with a simple to produce and easy to use, lightweight, handy device for cutting depth limitation in particular for sawing is created, which can be clamped and used universally with different drivers, provided the drivers of the power tool have their thorn-like projections on a matching, the Mitnahmeöffnungen of the tool and the depth stop corresponding pitch circle. Thus, the good handiness of the power tool when using the depth stop - in contrast to the known solutions - affected in any way.

As a result, in certain work tasks, a secure protection of the tool is possible, e.g. when a wood saw blade threatens to come into contact with masonry or concrete when cutting wood with a defined depth of cut and would thereby be damaged or at least blunted.

Further advantages of the new depth stop are quiet, tilt-free supportable sawing of thin materials, e.g. Metal sheets, because in this case the restoring forces of the oscillating saw blade are absorbed directly by the workpiece and not by the resilient operating hand. As a result, more saw teeth are used than with free-hand saws, which considerably reduces the risk of catching the saw teeth in the workpiece and the risk of breakage when using the new depth stop.

Due to the fact that the depth stop is placed directly and in the immediate vicinity of the tool on the drive unit, the penetration depth can be precisely and reproducibly set independently of the angular position of the saw blade. Because the contact surface of the depth stop is relatively large, scratch-sensitive materials can be processed without being damaged by the depth stop.

The fact that the depth stop is designed as a plastic injection molded part, are

Workpieces can be processed even more gently so that sensitive workpiece surfaces remain undamaged.

Characterized in that the depth stop defines the defined defined for penetration into the kerf part of the tool defines and defined from the defined

Prevents measure of further penetration into the kerf, by then on the

Supported workpiece, a particularly simple and lightweight depth stop is created, with the comfortable and safer sawn can.

The fact that the depth stop as a disc or wheel with several

Segments of different radial diameter stages is designed, the smallest diameter stage is greater than or equal to the size of the natural depth limit of the tool, different cutting depths are quickly and accurately adjustable.

Because the depth stop is arranged twice and axially on both sides of the saw blade, is supported on both sides of the kerf on the workpiece, the depth of cut can be realized even more accurately.

The fact that the hand tool is an oscillating grinder, the saw blade executes a rotary stroke with a certain angle, an advantageous, safe application of the new depth impact is possible, which is also applicable to angle grinder in other variants.

Characterized in that the tool has at least one, preferably two evenly spaced on the pitch circle, entrainment opening (s) for, in particular selective positive or non-positive engagement in each case at least one, preferably two, the mandrel-like projections of the driver, wherein the tool in the region Partial circle between the driving openings is free of engagement means for the projections, so that this area of the tool safely remains out of shape or adhesion with the projections, the tool is suitable both on drivers with twelve arbor-like projections as well as on carriers with a different number of protrusions - provided that the pitch circle diameters are the same. Characterized in that in each case a Segmentnut or a free space is arranged on a pitch circle of the saw blade and / or the depth stop between the driving openings, which safely disengage when coupling the at least one driving opening with the matching projection of the driver with possibly further arranged on the pitch circle projections remain depth stop and tool on all carriers of the same pitch suitable for the thorn-like projections.

Characterized in that only three, preferably at a regular distance from one another, arranged on a pitch circle driving openings of the saw blade and / or driving pockets of the depth stop in positive engagement with three of the particular twelve projections of the driver, wherein in addition to the three driving openings on the pitch circle each have a circular arc-shaped recess , In particular segment groove and / or that in addition to the three entrainment pockets on the pitch circle ever a circular arc-shaped recess, in particular free space is designed so that there is no engagement with one or more of the projections, tool and depth stop are universally applicable.

Characterized in that axially adjacent to the tool, preferably axially supporting it, serving as a depth stop, disc-like means is arranged, which releases relative to its outer edge intended for penetration into the kerf portion of the tool in a defined degree and from the defined measure on hinders further penetration into the kerf, as soon as the edge reaches the workpiece for support, wherein the disc-shaped tool cup-shaped and also the depth stop in the same direction are designed cup-shaped, wherein the depth stop occurs in the concave cup-shaped portion of the tool and / or that he vice versa the tool receives axially supporting in its concave pot-shaped region, a reliable and accurate depth stop for cranked tools is created.

The fact that the depth stop is positively coupled via its radially inner region with the acting as a driver inner flange of the output shaft, the inner flange on its side facing the tool with several, in particular two or three or a multiple of two or three, preferably twelve, thorn-like Projections is provided which engage for play-free rotational drive of the depth stop in a plurality of entrainment pockets, in particular two or three or a multiple of two or three, of the depth stop, wherein the projection ge and the entrainment pockets sit on a same sized pitch circle, the depth stop is universally usable with drivers of different numbers of projections - provided that the pitch circle diameter are the same.

Due to the fact that each entrainment pocket of the depth stop sits in a fork with two tine-shaped axial elevations, wherein these axial elevations can be supported with their outer sides on further, adjacent thorn-like projections of the driver, the form-fit clamping of the depth stop on carriers with a maximum of twelve projections especially safe.

Characterized in that the depth stop relative to the tool is mounted limited movable so that different cutting depths are adjustable.

Due to the fact that the depth stop can be adjusted in a positionally positionable position relative to the tool, different cutting depths can be set conveniently and safely.

drawing

The invention will be explained with reference to an embodiment with accompanying drawings. Show it:

Figure 1 shows a hand tool according to the invention with oscillating drivable tool with depth stop - shown schematically

Figure 2 is a side sectional view of the driver

FIG. 3 shows a plan view of the driver according to FIG. 2,

Figure 4 is a side sectional view of the driver with attached tool and depth stop

Figure 5 is a plan view of a cranked segment saw blade

Figure 6 is a plan view of the depth stop

Figure 7 is a side sectional view of the depth stop

Figure 8 is a side view of an embodiment of a depth stop Figure 9 is a side view of another embodiment of a depth stop embodiment

An illustrated schematically in Figure 1, besipielhafte hand tool 10 has an elongated housing 12 having a longitudinal axis 13, which carries on its upper side a switch button 14 for switching on and off of the seated in the housing 12, not shown engine. The motor is connected via a cable 16 to a power supply or is fed directly from a battery. It transmits its movement to a front mounted in the housing 12 output shaft 18 having an axis 20. The axis 20 occurs in this example at an angle, substantially perpendicular to the longitudinal axis 13 of the housing 12 and carries at its end an inner flange 24, at the same time as Driver 19 is used.

The output shaft 18 carries on its inner flange 24 a releasably tensioned, oscillating drivable, substantially planar tool 22, which is configured as a flat, circular segment saw blade 22a and the between the inner and an outer flange 24, 26 rotatably clamped by means of a clamping screw 27 formed as fastening means is. The plane saw blade 22a carries directly on its axial outside a circular disc-shaped depth stop 28, as it is known from DE 10 2008 001 234 AI. During sawing, the saw blade 22a is guided into a workpiece 90 by machining, in which case the immersion depth or depth of cut via the depth stop 28 is selectively or adjustably limited.

The driver 19 shown in Figure 2 in a side sectional view is part of the inner flange 24, which sits at the end of the output shaft 18 and carries on its side facing the saw blade 22a twelve mandrel-like projections 21, the play-free engagement in matching driving holes 30 of the saw blade 22a or in carrying pockets of the depth stop 28 serve. A central

Screw opening 23 is used to engage the clamping screw 27 for screwing the outer flange 26 for the purpose of clamping the tool 22nd

The driver 19 shown in Figure 3 as a plan view of Figure 2 shows the twelve mandrel-like projections 21 as radially evenly spaced on a pitch circle 29 arranged, small circles and as a central circle, the central screw opening 23rd In addition to plane tools 22, such as the saw blade 22a, tools 220 are also known which have a receiving area protruding from a plane of the tool, in particular a cranked area.

The illustrated in Figure 4 in a side sectional view driver 19 with it stretched, cranked blade 220a and it stretched cranked depth stop 280 shows their common, positive position assurance on the driver 19 by means of the outer flange 26 and the clamping screw 27. The clamping screw 27 engages with her Thread in the threaded bore 23 of the inner flange 24 and the driver 19.

The saw blade 220a is arranged directly adjacent to the driver 19, in that the driving openings 30 overlap the corresponding projections 21 in a form-fitting manner for play-free rotational driving.

In this case, the projections 21 have an axial length such that they completely pass through the entrainment openings 30, project beyond the rear flat side of the saw blade 22 and engage in two, preferably three or more entrainment pockets 34 of the likewise bent depth stop 280 for its form-locking rotational drive. As FIG. 7 shows, the entrainment pockets 34 are arranged in a circumferential region of a contact surface 340.

The depth stop 280 is supported on the workpiece 90 during machining, in particular during sawing when reaching a corresponding depth of cut or penetration depth with its relatively wide, large-area outer edge 290 and thus limits the penetration depth of the tool 220, in particular of the saw blade 220a into the workpiece 90 This cutting depth or penetration depth can then be effortlessly maintained over long cutting lengths. This avoids unsuitable sawing results due to too flat kerf or unnecessary sawing due to too deep kerf. Depending on the size of the outer diameter of the depth stop 280 its outer edge 290 is radially closer or further away from the outer edge of the tool 220, in particular the saw blade 220 a, so that accordingly the maximum depth of cut can be easily predefined or changed by selecting the desired depth stop. The depth stop 280 is designed such that its outer edge 290 is supported axially on a flat side 224 of the tool 220, in particular the saw blade 220 a, facing it. Preferably, the outer edge 290, in particular on a flat side 224 side facing a substantially flat contact surface 340 substantially parallel contact surface 292. This causes a measurable vibration damping of the tool 220, in particular saw blade 220a eg when sawing cement joints in tile surfaces during repair and rehabilitation work.

5 shows a plan view of the cranked segment saw blade 220a with a row of teeth 222 and a central hole 25 for the passage of the clamping screw 27. The hole 25 is located centrally in the bottom 331 in a cup-like offset 33. The crank 33 has a depth of about 8 mm and extends at a radial distance of about 15 mm from the center of the saw blade 220a. In the bottom 331 of the crank 33 are arranged between the outer edge of the crank and the center of the saw blade on a pitch circle 3 uniformly spaced driving openings 30, which serve to frictionally with three of the twelve projections 21 of the driver 19. On the pitch circle between the driving apertures 30 are three adjacent to the driving holes 30, arcuate Segmentnuten 32 are arranged. As a result, the saw blade 220a, despite only three existing driving openings 30 in twelve different rotational positions on the driver 19 can be tightened securely rotating.

With four evenly spaced driving openings on the pitch circle and accordingly four segment grooves arranged therebetween on the pitch circle, such a saw blade is likewise tensioned in all 12 possible different rotational positions.

It is also sawing blades 220a or similar tools 220 with 3 or more, at least less than 12, unequally spaced driving openings provided on the driver 19 are stretched when the distance of the driving apertures to each other with the divider of 12 on the pitch circle of the driver 19 matches, if between the corresponding driving openings corresponding segment grooves or equivalent means, such as arcuate recesses are provided. The depth stop 280 shown in plan view in FIG. 6 shows a circular segment shape and a radially wide outer edge 290. The bottom of its offset 38 carries on its pitch circle 311 three entrainment pockets 34 equally spaced therefrom, which are formed by a two-pronged fork 35. Extending between the fork outer edges of adjacent forks 35 are three elongated arcuate clearances 36 axially at least as deep as the three drive pockets 34 so as to remain securely disengaged from any projections 31 of the follower 19 (see FIGS. 1 and 4) the depth stop 28 at twelve matching projections 21 in twelve different rotational positions relative to the driver 19 is rotatably clamped. The outer edges of the forks 35 are supported in each case laterally from the next adjacent projections 21 of the driver 19, so that thus the clamping position of the depth stop 35 is set particularly secure against rotation.

FIG. 7 shows a side sectional view of the depth stop 280, which illustrates the details according to FIG.

According to DE 10 2008 001 234 A1, the depth stop 280 can also have a plurality of stepped outer edges 290, each with a different diameter, so that different penetration depths or cutting depths can be achieved by changing the rotational position relative to the tool 220.

FIG. 8 shows a corresponding exemplary embodiment which has a total of 5 segments 294a to 294e, each with different diameter steps 296. However, more or less segments with varying diameter steps 296 may be provided. In the embodiment according to FIG. 8, a recess 298 is provided for between each through-segment 294a to 294e, which ensures a secure transition between adjacent diameter steps 296. Vorzusgweise can be besipielsweise provided on one or both side surfaces 297 a mark 299 for easier selection of the adjustable penetration or depth of cut.

Figure 9 shows a second embodiment of a depth stop 280 in which the outer edge 290 is a substantially continuous change in the Diameter has. In a transition region 291, a compensation is provided between the edge region with the smallest diameter and the edge region with the largest diameter. In the raised collar of the outer edge 290 may be provided to facilitate the selection of the adjustable depth of penetration or depth of cut markings 299a, such as depressions or elevations. Alternatively or additionally, marks 299 similar to the exemplary embodiment from FIG. 8 can be provided for the mark 299 on one or both side surfaces 297. Preferably, the markings 299 are provided at least in two parallel extending, the periphery of the depth stop rows, which illustrate depending on a diameter of the tool 220, the adjustable penetration depth or depth of cut.

Starting from the examples of the invention presented here, it will be easy for the person skilled in the art to find and implement other embodiments of the invention. For example, alternative embodiments may be found by combining the features disclosed above.

The invention is suitable for battery-powered or pneumatic-powered hand tool machines or for any type of drive, in particular for their use-separating tools such as flat circular saw blades or segment cutting tools.

Claims

claims

1. stop device, in particular depth stop (280), for a rotating, in particular oscillating antreibares, cutting or cutting, round and / or square disc-shaped tool (22, 220) of a hand tool, in particular saw blade, with the cutting a kerf (92) in one Workpiece (90) can be produced, which comprises a disk-like means which is axially adjacent to the tool (22, 220), preferably axially supporting therefrom and with respect to its outer edge (290) a part intended to penetrate into the kerf (92) of the tool (22) releases to a defined degree and from the defined extent prevents further penetration into the kerf (92) as soon as the edge (290) reaches the workpiece (90) for support, characterized in that the disc-shaped tool (22 , 220) cup-shaped and also the stop device, in particular the depth stop (280) are designed cup-shaped in the same direction accurately, wherein the depth stop (280) enters a concave cup-shaped region of the tool (22, 220) and / or conversely receives the tool (22, 220) axially supporting in its concave cup-shaped region.

2. Stop device according to claim 1, characterized in that the stop device, in particular the depth stop (280) relative to the tool (22, 220) is mounted limitedly movable.

3. Stop device according to one of the preceding claims, characterized in that the stop device, in particular the depth stop (280) relative to the tool (22, 220) is latchable positionable adjustable.

4. Stop device according to one of the preceding claims, characterized in that the stop device, in particular the depth stop (280) consists of a plurality of segments (321 to 326) of different radial diameter steps.

5. Stop device according to one of claims 1 to 3, characterized in that the stop device, in particular the depth stop (280), at least over a partial region of a circumferential direction of the edge (290) identifies at least one peripheral portion with a varying, in particular monotone varying diameter, wherein the outer shape is preferably defined by a curve which connects different distance points, preferably steadily.

6. Stop device according to one of the preceding claims, characterized in that between adjacent segments (321 to 326) and adjacent peripheral portions recesses are provided with respect to the adjacent segments (321 to 326) and peripheral portions of smaller diameter.

7. An abutment device according to one of the preceding claims, characterized in that the edge (290) of the disc-like means a thicker compared to a thickness of the disc-like means, in particular with respect to a side surface of the disc-like means increased collar (292) identifies.

8. A stop device according to one of the preceding claims, characterized in that there are provided on at least one side surface of the disc-like means and / or the federal markings for the targeted adjustment of a penetration depth.

9. Hand tool with rotating, in particular oscillating drivable, cutting or cutting, round and / or square disc-shaped tool (22, 220), in particular saw blade, with the cutting a kerf (92) in a workpiece (90) can be produced, wherein the tool (22, 220), in particular saw blade, with its radially inner region with the driver (19) acting inner flange (24) of the output shaft (18) can be coupled, wherein the radially inner region of the tool (22, 220) more on a pitch circle (31) arranged as entrainment openings (30) or depressions as engagement means for the positive, play-free engagement in a plurality of mandrel-like, on a same pitch circle (211) of the driver (19) arranged projections (21), and a stop device, in particular a depth stop ( 280) according to at least one of the preceding claims.

10. Hand tool according to claim 9, characterized in that the depth stop (280) via its radially inner region form-fitting with the driver (19) acting inner flange (24) of the output shaft (18) can be coupled, wherein the inner flange (24) on its the tool (220) facing side with a plurality, in particular two or three or a multiple of three, preferably twelve, thorn-like projections (21) is provided for play-free rotational drive of the depth stop (280) in a plurality of driving pockets (34), in particular two or three or a multiple of two or three, of the depth stop (280) engage, wherein the projections (21) and the entrainment pockets (34) on a same-sized pitch circle (211, 311) sit.

11. Hand tool according to Claim 10, characterized in that each entrainment pocket (34) of the depth stop (280) sits centrally in a fork (35) with two tine-shaped axial elevations, wherein these axial elevations with their outer sides on another, adjacent mandrel-like Support projections (21) of the driver (19).

12. Hand tool according to one of claims 9 to 11, characterized in that on both sides of the tool (22, 220) a depth stop (28) sits, for supporting on both sides of the kerf (92) on the workpiece (90) as soon as the intended Cutting depth is reached.