Handheld circular saw with a depth adjustment device

Abstract

In a hand-held circular saw with a housing in which a drive motor for rotating a circular saw blade is arranged, and with a depth adjustment device (150) for setting a cutting depth of the circular saw blade in a workpiece to be machined, wherein the depth adjustment device (150) has an arc-shaped guide rail (240) with an arc-shaped recess (243) and an operating element (220) for setting the cutting depth, the operating element (220) is associated with a locking element (250) with a first locking contour (252) and the guide rail (240) has a second locking contour (244), wherein the first locking contour (252) can be connected to the second locking contour (244) via a locking connection (290) for setting the cutting depth.

Description

State of the art

[0001] The present invention relates to a hand-held circular saw with a housing in which a drive motor for rotating a circular saw blade is arranged, and with a depth adjustment device for adjusting a cutting depth of the circular saw blade in a workpiece to be machined, wherein the depth adjustment device has an arcuate guide rail with an arcuate recess and an operating element for adjusting the cutting depth.

[0002] Such a hand-held circular saw is known from the prior art. The hand-held circular saw comprises a housing in which a drive motor is arranged for rotating a circular saw blade. Furthermore, the hand-held circular saw comprises a depth adjustment device for adjusting the cutting depth of the circular saw blade in a workpiece to be machined. The depth adjustment device comprises an arcuate guide rail with an arcuate recess and an operating element for adjusting the cutting depth. Disclosure of the invention

[0003] The invention relates to a hand-held circular saw comprising a housing in which a drive motor is arranged for rotating a circular saw blade, and comprising a depth adjustment device for adjusting a cutting depth of the circular saw blade in a workpiece to be machined. The depth adjustment device comprises an arcuate guide rail with an arcuate recess and an operating element for adjusting the cutting depth. A locking element with a first locking contour is assigned to the operating element, and the guide rail has a second locking contour. The first locking contour can be connected to the second locking contour via a locking connection for adjusting the cutting depth.

[0004] The invention thus makes it possible to provide a hand-held circular saw in which the first and second locking contours enable simple and reliable operation of the depth adjustment device.

[0005] Preferably, the operating element is arranged pivotably on the curved guide rail.

[0006] This makes it easy and uncomplicated to operate the control element.

[0007] Preferably, the hand-held circular saw has a protective hood arranged on the circular saw blade, which can be pivoted with the circular saw blade when adjusting the cutting depth, wherein the protective hood is connected to the curved guide rail via a bolt guided in the curved guide rail.

[0008] This allows for a safe and robust arrangement of the protective hood on the curved guide rail.

[0009] The locking element is preferably assigned a spring element which urges the locking element against the curved guide rail.

[0010] This makes it easy to press the locking element against the curved guide rail.

[0011] Preferably, the operating element has a receptacle for accommodating the locking element in sections.

[0012] This enables a simple and stable arrangement of the locking element on the control element.

[0013] Preferably, the receptacle has a recess for positioning the locking element.

[0014] This enables the locking element to be securely and reliably accommodated.

[0015] Preferably, the locking element has a support surface which can be arranged within the receptacle, wherein the support surface is curved along a transverse direction of the locking element.

[0016] This makes it easy and uncomplicated to compensate for a change in angle between the control element and the curved guide rail when the control element is operated.

[0017] According to one embodiment, the first locking contour and the second locking contour are formed asymmetrically or symmetrically at least in sections.

[0018] This makes it easy to provide a suitable locking contour.

[0019] Preferably, the locking element has at least one guide element for guiding in the guide rail.

[0020] This enables safe and robust guidance of the locking element.

[0021] According to one embodiment, a safety element is assigned to the operating element, which prevents an unintentional actuation of the operating element, wherein the operating element can be actuated in a first actuation direction and the safety element can be actuated in a second actuation direction, wherein the first and second actuation directions are different.

[0022] This makes it easy and straightforward to prevent accidental activation of the control element. Short description of the drawings

[0023] The invention is explained in more detail in the following description using exemplary embodiments illustrated in the drawings. They show: Fig. 1 a schematic view of a hand-held circular saw with a handle and a depth adjustment device, Fig. 2 a perspective view of the handle and the depth adjustment device of the circular saw of Fig. 1, Fig. 3 a section through the depth adjustment device of Fig. 1 and Fig. 2, seen in the direction of an arrow 298 of Fig. 2, Fig. 4 a plan view of the depth adjustment device of Fig. 1 to Fig. 3, seen in the direction of arrow 298 of Fig. 2, Fig. 5 is a perspective view of one of the depth adjustment devices of Fig. 1 to Fig. 4 assigned control element, Fig. 6 is a perspective view of one of the depth adjustment devices of Fig. 1 to Fig. 4 assigned locking element, Fig. 7 a side view of the locking element of Fig. 6, Fig. 8 an enlarged section of one of the depth adjustment devices of Fig. 1 to Fig. 4 associated curved guide rails, Fig. 9 a sectional view through the depth adjustment device of Fig. 1 to Fig. 4, seen in the direction of an arrow 297 of Fig. 2, in a first position, Fig. 10 a sectional view through the depth adjustment device of Fig. 1 to Fig. 4 and Fig. 9, seen in the direction of arrow 298 from Fig. 2, in a second position, Fig. 11 a sectional view through the depth adjustment device of Fig. 1 to Fig. 4 and Fig. 10, seen in the direction of arrow 297 of Fig. 2, in a second position, and Fig. 12 a perspective view of the depth adjustment device of Fig. 1 to Fig. 4 and Fig. 9 to Fig. 11 with a security element. Description of the embodiments

[0024] In the figures, elements with the same or comparable function are provided with identical reference symbols and are described in detail only once.

[0025] Fig. 1 shows an exemplary hand-held circular saw 100 with a housing 110 in which a drive motor 120 is arranged for rotating a circular saw blade 140. A handle 115 is preferably associated with the housing 110. According to one embodiment, the hand-held circular saw 100 has a battery pack 190 for mains-independent power supply. Alternatively, the hand-held circular saw 100 can have a power cord for mains-dependent power supply.

[0026] Furthermore, the hand-held circular saw 100 preferably has a base plate 130. The base plate 130 preferably rests on a workpiece to be machined during a machining operation.

[0027] Furthermore, the hand-held circular saw 100 has a depth adjustment device 150 for adjusting a cutting depth of the circular saw blade 140 in a workpiece to be machined. The depth adjustment device 150 is preferably arranged in the region of the handle 115 of the hand-held circular saw 100. The depth adjustment device 150 is preferably arranged along a rotational axis of the circular saw blade 140 between the circular saw blade 140 and the handle 115. The depth adjustment device 150 is preferably also arranged along the rotational axis of the circular saw blade 140 between the circular saw blade 140 and the drive motor 120.

[0028] Fig. 2 shows the hand-held circular saw 100 from Fig. 1 associated handle 115 and illustrates the depth adjustment device 150 of Fig. 1. Illustratively, on the handle 115, a right hand 210 of a user of the circular saw 100 is shown. Fig. 1. The depth adjustment device 150 is preferably arranged on the hand-held circular saw 100 such that a thumb 212 of the user, in particular a thumb 212 of the user's right hand 210, can operate the depth adjustment device 150.

[0029] For this purpose, the depth adjustment device 150 preferably has an operating element 220 with an operating section 222. The operating element 220 is preferably pivotably arranged on the hand-held circular saw 100. To adjust the depth adjustment device 150, the operating element 220 or the operating section 222 is acted upon in the direction of an arrow 201 towards the handle 115 and a desired cutting depth of the circular saw blade 140 of Fig. 1 can be set.

[0030] Preferably, the depth adjustment device 150 has an arcuate guide rail 240 with an arcuate recess 243. Illustratively, the operating element 220 is pivotably arranged on the arcuate guide rail 240. By way of example, the operating element 220 is in Fig. 2 is arranged to be pivotable about a rotation axis 260. Alternatively, the operating element 220 can be pivotable about a solid-state joint instead of the rotation axis 260.

[0031] The preferred circular saw blade is 140 Fig. 1 a protective hood 230 is arranged. The protective hood 230 encloses the circular saw blade 140 in an area above the base plate 130 of Fig. 1 at least in sections. Preferably, the protective hood 230 is positioned when adjusting the cutting depth with the circular saw blade 140 of Fig. 1 pivotable. Preferably, the protective hood 230 is connected to the curved guide rail 240 via a bolt 242 guided in the curved guide rail 240.

[0032] The guide rail 240 is preferably connected to the base plate 130 of the circular hand saw 100 by means of a holding device 270. Fig. 1. Preferably, the guide rail 240 is attached to the holding device 270 by means of a screw connection. According to one embodiment, the holding device 270 is designed as a spherical bearing.

[0033] According to the invention, a locking element 250 with a first locking contour 252 is assigned to the operating element 220 of the depth adjustment device 150. Furthermore, the guide rail 240 has a second locking contour 244. Preferably, the first locking contour 252 and the second locking contour 244 are designed to be asymmetrical or symmetrical, at least in sections. The first locking contour 252 can preferably be connected to the second locking contour 244 via a locking connection 290 to adjust the cutting depth. The locking element 250 is preferably connected to the bolt 242.

[0034] By actuating the operating element 220, the locking connection 290 is released, and the required cutting depth can be set by moving the depth adjustment device 150 along the arcuate recess 243 of the guide rail 240 or along an arrow 202. Once the desired cutting depth has been set, the operating element 220 is released by the user, thereby restoring the locking connection 290 and thus fixing the cutting depth.

[0035] Furthermore, Fig. 2 an arrow 297 to clarify a respective viewing direction in Fig. 9 and Fig. 11. In addition, an arrow 298 is shown to indicate the respective viewing direction in Fig. 3, Fig. 4 and Fig. 10 shown.

[0036] Fig. 3 shows the depth adjustment device 150 of Fig. 1 and Fig. 2, seen in the direction of arrow 298 from Fig. 2. This illustrates Fig. 3 shows the operating element 220, which is assigned a hook-shaped portion 322 for positioning on the rotation axis 260. Alternatively, the portion 322 could also be cylindrical. Preferably, the rotation axis 260 is arranged on a holding portion 312 of the protective cover 230.

[0037] In addition, the protective hood 230 illustratively has a further holding section 314 with an internal receptacle 310. The bolt 242 is preferably arranged in sections in the internal receptacle 310. The bolt 242 preferably forms a screw connection with the internal receptacle 310. According to one embodiment, the bolt 242 is designed as a screw. In this case, a screw head 342 of the bolt 242 designed as a screw is arranged on a side of the guide rail 240 facing away from the operating element 220, and a threaded section 344 is arranged in the internal receptacle 310. The protective hood 230 is preferably arranged along a rotation axis 345 of the bolt 242 between the handle 115 and the guide rail 240.

[0038] Furthermore, Fig. 3 shows the locking connection 290 between the locking element 250 and the guide rail 240. The bolt 242 positions the locking element along the rotation axis 345 between the holding section 314 of the protective hood 230 and the guide rail 240. Furthermore, the operating element 220 has a receptacle 324 for receiving the locking element 250. Preferably, the locking element 250 is assigned a spring element 340, which urges the locking element 250 against the guide rail 240. The spring element 340 is preferably arranged on an outer circumference of the holding section 314 of the protective hood 230. The spring element 340 is preferably designed as a spiral spring.

[0039] Fig. 4 shows the depth adjustment device 150 of Fig. 1 to Fig. 3 shown in the direction of arrow 298 of Fig. 2. This illustrates Fig. 4 shows the hook-shaped portion 322 of the operating element 220, wherein the rotation axis 260 is preferably formed by a screw 460. A screw head associated with the screw 460 prevents displacement of the hook-shaped portion 322.

[0040] Fig. 5 shows the depth adjustment device 150 of Fig. 1 to Fig. 4, with the operating section 222 and the hook-shaped section 322. A U-shaped section 510 is arranged along a longitudinal direction 501 of the operating element 220 between the operating section 222 and the hook-shaped section 322. The U-shaped section 510 forms a receptacle 512. Illustratively, the receptacle 512 is open downward. The receptacle 512 is designed to receive the locking element 250 in sections.

[0041] Furthermore, the operating element 220, in particular the U-shaped section 510, has a recess 514 in the transverse direction 502. The recess 514 is designed for positioning the locking element 250. Illustratively, the recess 514 is oval. Alternatively, the recess can also have any other shape and thus, for example, be round or square.

[0042] Fig. 6 shows the depth adjustment device 150 of Fig. 1 to Fig. 4 associated locking element 250. The locking element 250 has a cylindrical base body 605 with a central recess 640. Preferably, a support surface 610 is associated with the cylindrical base body 605. The support surface 610 is arranged on a side 602 of the cylindrical base body 605 facing the first locking contour 252. In particular, the support surface 610 is arranged in the radial direction 608 outside the first locking contour 252. The support surface 610 is preferably within the receptacle 512 of Fig. 5 of the operating element 220, wherein the support surface 610 is curved along a transverse direction 609 of the locking element 250.

[0043] The first locking contour 252 is preferably asymmetrical and preferably has a sawtooth profile. A comparatively steep angle of the profile can create a self-locking effect, thus preventing unwanted adjustment of the depth adjustment device 150 by applying a force to the protective cover 230. Alternatively, the first locking contour 252 can also be symmetrical.

[0044] Illustratively, the first locking contour 252 is divided into two locking sections 622, 624. In each case, one locking section 622, 624 is arranged laterally or in the radial direction 608 outside the recess 640. The illustratively right locking section 622 has, for example, locking elements 623, whose tips 627 point downwards. The illustratively left locking section 624 has, for example, locking elements 625, whose tips 629 point upwards. Thus, the locking elements 623 and the locking elements 625 are preferably arranged in opposite directions or opposite to one another.

[0045] Preferably, the locking element 250 has at least one guide element 631, 632 for guiding in the guide rail 240 of Fig. 2 to Fig. 4. Two guide elements 631, 632 are shown illustratively, with guide element 631 being arranged above recess 640 and guide element 632 being arranged below recess 640. Preferably, guide elements 631, 632 are arranged between the two locking sections 622, 624.

[0046] Preferably, the guide elements 631, 632 project beyond the locking sections 622, 624 in the transverse direction 609 of the locking element 250. The guide elements 631, 632 are preferably designed to prevent rotation of the first locking contour 252 relative to the second locking contour 244 of Fig. 2 and Fig. 3 of the guide rail 240.

[0047] Fig. 7 shows the locking element 250 of the depth adjustment device 150 of Fig. 1 to Fig. 4. This illustrates Fig. 7 the preferably curved support surface 610 of the locking element 250. Furthermore, Fig. 7 a recess 710 formed on the cylindrical base body 605 of the locking element 250. Preferably, the recess 710 is formed in the radial direction 608.

[0048] Fig. 8 shows an enlarged section of the guide rail 240 of the depth adjustment device 150 of Fig. 1 to Fig. 4 and illustrates the second locking contour 244. The second locking contour 244 is preferably integrated into the guide rail 240. The second locking contour 244 can be produced by forging. Furthermore, the second locking contour 244 can be produced during production, e.g., if the guide rail 240 is produced as a cast part, in particular a die-cast part. Alternatively, the second locking contour 244 can be manufactured as a separate part and attached to the guide rail 240 via a suitable connection. Preferably, the suitable connection can be formed as a screw connection or produced by ultrasonic welding.

[0049] Analogous to the locking element 250, the guide rail 240 or the second locking contour 244 is divided into two locking sections 811, 812. In this case, one locking section 811, 812 is arranged laterally of the recess 243. The illustrative right-hand locking section 811 has, for example, locking elements 813, the tip 827 of which points downwards. The illustrative left-hand locking section 812 has, for example, locking elements 815, the tip 829 of which points upwards. Thus, the locking elements 813 and the locking elements 815 are preferably arranged in opposite directions or opposite to one another. Furthermore, the second locking contour 244 is preferably asymmetrical and preferably has a sawtooth profile. Alternatively, the second locking contour 244 can also be symmetrical.

[0050] Fig. 9 shows the depth adjustment device 150 of Fig. 1 to Fig. 4, shown in the direction of arrow 297 of Fig. 2, in a locked position 900. In the locked position 900, the first and second locking contours 252, 244 form the locking connection 290.

[0051] Fig. Figure 9 illustrates the arrangement of the spring element 340 on the outer circumference of the holding section 314 of the protective hood 230 and in the recess 710 of the locking element 250. Furthermore, the locking element 250 is positioned in the recess 514 of the operating element 220. Furthermore, the guide rail 240 is arranged on the holding section 314 of the protective hood 230 by the bolt 242. The locking element 250 is urged against the guide rail 240 by the spring force of the spring element 340, which is visualized by the arrow 901. Furthermore, the guide rail 240 is supported by the bolt. The bolt applies a force that is visualized by the arrow 902. Furthermore, Fig. 9 the support of the hook-shaped section 322 on the screw head 460 of the rotation axis 260.

[0052] Fig. 10 shows the depth adjustment device 150 of Fig. 1 to Fig. 4 and Fig. 9, shown in the direction of arrow 298 of Fig. 2, in a non-locked position 1000, in which the first and second locking contours 252, 244 do not form a locking connection 290. In Fig. 10, the operating element 220 is actuated or acted upon in the direction of an arrow 1001, whereby the locking element 250 is released from the guide rail 240 against the spring force of the spring element 340. Thus, the first and second locking contours 252, 244 are spaced apart from each other. The locking connection 290 of Fig. 9 is thus solved and a cutting depth can be set.

[0053] Fig. 11 shows the depth adjustment device 150 of Fig. 10 in a view seen in the direction of arrow 297 of Fig. 2. An arrow 1102 visualized in Fig. 11 a force of the operating element 220, which counteracts the spring force of the spring element 340, which is visualized by the arrow 901, to release the locking connection 290 from Fig. 9 is required.

[0054] Fig. 12 shows the depth adjustment device 150 of Fig. 1 to Fig. 4 and Fig. 9 to Fig. 11, wherein, according to one embodiment, the operating element 220 is assigned a safety element 1210 that prevents unintentional actuation of the operating element 220. Here, the operating element 220 can be actuated in a first actuation direction 1202, and the safety element 1210 can be actuated in a second actuation direction 1201. Preferably, the first and second actuation directions 1202, 1201 are different.

[0055] It should be noted that the operating element 220 can alternatively be designed to be flexible. In this case, an elastic deformation of the operating element 220 is achieved when the operating element 220 is actuated.

Claims

[1] A hand-held circular saw (100) comprising a housing (110) in which a drive motor (120) for rotating a circular saw blade (140) is arranged, and comprising a depth adjustment device (150) for adjusting a cutting depth of the circular saw blade (140) in a workpiece to be machined, wherein the depth adjustment device (150) comprises an arcuate guide rail (240) with an arcuate recess (243) and an operating element (220) for adjusting the cutting depth, characterized by that the operating element (220) is assigned a locking element (250) with a first locking contour (252) and the guide rail (240) has a second locking contour (244), wherein the first locking contour (252) can be connected to the second locking contour (244) via a locking connection (290) for adjusting the cutting depth. [2] Handheld circular saw according to claim 1, characterized by that the operating element (220) is pivotably arranged on the curved guide rail (240). [3] Handheld circular saw according to claim 1 or 2, characterized by a protective hood (230) arranged on the circular saw blade (140) which can be pivoted with the circular saw blade (140) when adjusting the cutting depth, wherein the protective hood (230) is connected to the curved guide rail (240) via a bolt (242) guided in the curved guide rail (240). [4] Handheld circular saw according to one of the preceding claims, characterized by that the locking element (250) is assigned a spring element (340) which urges the locking element (250) against the curved guide rail (240). [5] Handheld circular saw according to one of the preceding claims, characterized by that the operating element (220) has a receptacle (512) for sectionally receiving the locking element (250). [6] Handheld circular saw according to claim 5, characterized by that the receptacle (512) has a recess (514) for positioning the locking element (250). [7] Handheld circular saw according to claim 5 or 6, characterized by that the locking element (250) has a support surface (610) which can be arranged within the receptacle (512), wherein the support surface (610) is curved along a transverse direction (609) of the locking element (250). [8] Handheld circular saw according to one of the preceding claims, characterized by that the first locking contour (252) and the second locking contour (244) are formed asymmetrically or symmetrically at least in sections. [9] Handheld circular saw according to one of the preceding claims, characterized by that the locking element (250) has at least one guide element (631, 632) for guiding in the guide rail (240). [10] Handheld circular saw according to one of the preceding claims, characterized bythat the operating element (220) is assigned a safety element (1210) which prevents an unintentional actuation of the operating element (220), wherein the operating element (220) can be actuated in a first actuation direction (1202) and the safety element (1210) can be actuated in a second actuation direction (1201), wherein the first and second actuation directions (1202, 1201) are different.

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