hand-held power tool

Abstract

A hand-held power tool, in particular a router, comprising a housing unit (24) including a drive unit for driving a tool, a support unit (14) movably mounted relative to the housing unit (24) for resting on a workpiece, and a guide unit (26) having a guide rod (42) for guiding the housing unit (24) relative to the support unit (14) along a guide axis (f), wherein the hand-held power tool has a depth adjustment device (32) with a coarse depth adjustment device (34) for coarse depth adjustment and with a fine depth adjustment device (36) for fine depth adjustment, wherein the coarse depth adjustment device (34) has a first actuating element (38) and the first actuating element (38) is further spaced from the support unit (14) than a second actuating element (40) of the fine depth adjustment device (36), characterized in thatthat the second actuating element (40) is designed as a rotary wheel element (40) which rests on the support unit (14) and is rotationally fixed to the guide rod (42), and that the first actuating element (38) is designed as a spring-loaded sliding element (38) for engaging or disengaging a threaded element (54) from the guide rod (42).

Description

[0001] The invention relates to a hand-held power tool, in particular a router, according to the preamble of the first claim. State of the art

[0002] EP 1 661 675 B1 discloses a milling machine supported by a support element, the support element having a top surface on which a workpiece is mounted, the milling machine being mounted below the support element on a bottom surface of the support element, the milling machine comprising: a base engaged with the support element below the support element and defining a base opening; a motor housing movably supported by the base; a motor supported by the motor housing for driving a tool element; and an adjusting mechanism supported by the base and / or the motor housing for adjusting the position of the motor housing relative to the base and for adjusting the cutting thickness of the tool element, the adjusting mechanism having a first shaft connected to the base or the motor housing and rotatable about an axis.

[0003] Hand-held power tools of this type are also known from documents DE 103 59 420 A1, DE4139759A1, EP 1 726 415 B1, EP 1 673 203 B1, WO 2015 / 100 311 A1 and US 4 445 811 A. Disclosure of the invention

[0004] The invention is based on the objective of improving a hand-held power tool, in particular a router, by means of simple design measures.

[0005] The problem is solved with a hand-held power tool, in particular a router, comprising a housing unit with a drive unit for driving an insert tool, a support unit mounted movably relative to the housing unit for resting on a workpiece, and a guide unit, in particular having a guide rod, for guiding the housing unit relative to the support unit along a guide axis, wherein the hand-held power tool has a depth adjustment device with a coarse depth adjustment device for coarse depth adjustment and with a fine depth adjustment device for fine depth adjustment.

[0006] According to the invention, the coarse depth adjustment device, in particular a first actuating element of the coarse depth adjustment device, is spaced further away from the support unit than the fine depth adjustment device, in particular a second actuating element of the fine depth adjustment device.

[0007] The term "further spaced" refers in particular to the distance between each actuating device, especially an actuating element, the fine depth adjustment device, and the coarse depth adjustment device from the support unit, wherein the coarse depth adjustment device has a greater distance from the support unit than the fine depth adjustment device. In particular, the first actuating element is arranged on the hand-held power tool relative to the second actuating element in such a way that the distance of the first actuating element to the support unit changes relative to the second actuating element to the support unit depending on an adjustment movement of the depth setting.

[0008] The housing unit can comprise a motor housing, a gearbox housing, and / or an outer machine housing. The housing unit can be designed to house, in particular, several components such as a drive unit and / or components such as a gearbox. Specifically, the hand-held power tool, and in particular the housing unit, has a receiving unit designed to hold a tool and, in particular, to operate it directly or indirectly via the drive unit.

[0009] The support unit is designed to be placed on a workpiece to be machined and, in a machining state, to be moved, in particular along this workpiece, by means of a force applied to the hand-held machine tool by an operator.

[0010] The depth adjustment device enables convenient setting of, for example, the cutting depth of the tool in the workpiece being machined. In the depth adjustment device according to the invention, the housing unit is movably mounted relative to the support unit, thus allowing depth adjustment depending on a selected distance between the support unit and the housing unit.

[0011] Movement of the support unit relative to the housing unit can be guided by means of the guide unit, so that the guide unit allows at least one degree of freedom of movement, such as a direction of movement along a guide axis of the guide unit, in order to enable depth adjustment of the hand-held power tool.

[0012] For depth adjustment, the hand-held power tool has a depth adjustment device comprising a coarse depth adjustment device and a fine depth adjustment device. In particular, the coarse depth adjustment device may have a first actuating element. Preferably, the fine depth adjustment device may have a second actuating element. The first actuating element of the coarse depth adjustment device may be designed to enable coarse depth adjustment when actuated. The second actuating element may be designed to enable fine depth adjustment when actuated.

[0013] The depth adjustment mechanism, in particular the second actuating element, can be arranged adjacent to, and especially adjacent to, the support unit. In particular, the second actuating element can rest on the support unit.

[0014] This allows the hand-held power tool, especially the depth adjustment device, to be designed in a particularly compact manner.

[0015] Furthermore, in at least one embodiment of the invention, expensive and separate components such as a milling basket for depth adjustment can be eliminated, thus eliminating the need for threading or adjustment procedures when using a handheld power tool with a milling basket. Additionally, any deformation of the housing unit when using or jamming the housing unit with a milling basket can be avoided.

[0016] Furthermore, in at least one embodiment of the invention, the use of a quick-release fastener can be omitted. The design and assembly can also be simpler and more cost-effective.

[0017] The depth adjustment can also be operated with one hand. For example, the fine and coarse depth adjustments can be made using the thumb and middle finger of one operator's hand. Alternatively, the fine and coarse depth adjustments can be operated by different hands, for example, by requiring them to be operated from opposite sides.

[0018] Preferably, the axial extension of the guide unit, in particular the guide rod, can be optimally utilized so that it can be designed to be shorter.

[0019] The term "support unit" is understood to mean, in particular, a unit that rests on the workpiece during machining with a portable machine tool, provided the portable machine tool is operated correctly. Specifically, the support unit rests on the workpiece with its contact surface and is designed to support the portable machine tool on the workpiece during machining. "Designed" is understood to mean, in particular, specially designed and / or specially equipped. The support unit is preferably configured as a sliding shoe and / or a base plate. The support unit may include a through-hole for the insertion of a tool.The term "through-hole" is used here to define, in particular, a material recess in the support unit that has a smaller material thickness compared to directly adjacent areas of the support unit, especially a material thickness of 0 mm. The through-hole is preferably designed as a through-bore or as a through-hole open on one side. A tool arranged in a tool holder of a portable machine tool can preferably be passed through the through-hole when the support unit is coupled to the portable machine tool, in order to machine a workpiece on which the support unit rests with its support surface.

[0020] The dependent claims specify suitable further developments of the hand-held power tool according to the invention.

[0021] It may be advantageous for the depth adjustment device to have a threaded element, particularly one designed as a half-thread. In particular, the threaded element may have a thread axis arranged parallel to the guide axis. Preferably, the threaded element and / or the guide rod may be movably mounted along a radial direction of the guide axis. For example, the threaded element may be positively locked to the guide rod in the axial direction of the guide axis.

[0022] Furthermore, it can be advantageous for the guide rod to have a guide thread for fine depth adjustment and / or coarse depth adjustment, whereby the fine depth adjustment is adjustable along the entire axial length of the guide thread, thus avoiding the need to use the coarse depth adjustment. This allows any position along the entire length of the guide rod's guide thread to be reached for fine depth adjustment, so that any depth setting can be achieved using the fine depth adjustment device even without using a coarse depth adjustment. This eliminates the need for the time-consuming calibration of the depth setting required by conventional fine and coarse depth adjustment systems.

[0023] The coarse depth adjustment can be achieved by actuating the coarse depth adjustment device, in particular the first actuating element, to disengage the threaded element and / or to move the housing unit relative to the support unit in the axial direction of the guide axis. The fine depth adjustment can be achieved by actuating the fine depth adjustment device, in particular the second actuating element, to move the housing unit relative to the support unit in the axial direction of the guide axis while the threaded element is engaged. The guide rod, in particular the guide thread, can be engaged with the threaded element, and the threaded element can be moved axially, in particular by thread guidance, along the guide axis of the guide rod.

[0024] An engaged state is defined as a state of the threaded element in which it is positively connected to the guide unit, particularly the guide rod, in the axial direction of the guide axis. A disengaged state is defined as a state of the threaded element, particularly the thread axis of the threaded element, in which it is spaced radially away from the guide unit, particularly the guide rod, in the radial direction of the guide axis, such that it is not positively connected to the guide unit, particularly the guide rod, in the axial direction of the guide axis.

[0025] In particular, the guide rod can have a guide thread designed to move a thread engaging with the guide thread, especially that of the threaded element, along the guide axis of the guide rod. Preferably, the coupling / decoupling of the threaded element with the guide rod can be configured such that the threaded element, especially its thread axis, is adjustable parallel to the guide rod, particularly its guide axis. This allows the threaded element to be engaged and disengaged from the guide rod in a particularly wear-minimizing manner.

[0026] The guide thread can have an external thread. The threaded element can have an internal thread. A guide thread and / or a threaded element is defined as a thread that has a profiled groove which runs continuously in a helical fashion around an inner or outer wall, particularly a cylindrical one, especially in a helix. In particular, the "groove" can be referred to as a thread pitch.

[0027] According to the invention, the second actuating element is designed as a rotary knob. The rotary knob rests on the support unit and is rotationally fixed to the guide rod. It is proposed that the first actuating element be designed as a sliding element, in particular a spring-loaded one, for engaging or disengaging a threaded element from the guide rod. A sliding element is understood to be, in particular, an element of a slide switch for engaging or disengaging a threaded element from the guide rod. In particular, the sliding element can be formed integrally with the threaded element.

[0028] The first actuating element can be designed to separate the threaded element from the guide rod in a release state and to connect the threaded element to the guide rod in a form-fitting manner in an engagement state.

[0029] The rotary knob can be designed to adjust the fine depth setting by rotating, in particular, the guide rod. The rotary knob can thus enable a particularly convenient, precise, and quick fine depth adjustment of the hand-held power tool by rotating the rotary knob to allow for an adjustment, particularly via a threaded mechanism, or a relative movement of the housing unit relative to the support unit. The use of a rotary knob prevents unintentional adjustments.

[0030] In particular, fine depth adjustment and / or coarse depth adjustment can be enabled in an operating state of the hand-held power tool.

[0031] Furthermore, it may be advantageous for the threaded element to be spring-mounted in order to apply a spring force to the threaded element in the radial direction of the guide axis and to connect the threaded element to the guide rod in an engaged state, in particular by positive locking along the guide axis. It may also be advantageous for the threaded element and the first actuating element to be mounted by means of a return spring element, in particular a single one, which is arranged in the housing unit and is, in particular, completely surrounded by the housing unit. The return spring element can be designed to apply a spring force to the threaded element in a released state in the radial direction of the guide axis and, in an engaged state, to hold the threaded element in engagement with the guide rod. This allows for convenient operation of the machine tool.

[0032] It is proposed that the threaded element be designed as a worm gear. In particular, the coarse depth adjustment can have a self-locking bearing. Specifically, the threaded element can be self-locking relative to the guide rod. The worm gear can have a thread axis that is angled to the guide axis. "Self-locking" is understood to mean a resistance caused by friction against slippage or rotation of two adjacent elements / bodies. In particular, self-locking cannot be present once the static friction is exceeded.

[0033] It is further proposed that a spring element, in particular a compression spring, be provided between the housing unit and the support unit, which is intended to create a preload along the guide axis. This allows the housing unit to be spring-mounted relative to the support unit when the coarse depth adjustment is actuated, thus enabling convenient depth adjustment.

[0034] It may be advantageous for the guide rod to have an external thread for coarse and fine depth adjustment. It may also be advantageous for the guide rod to be rotatably mounted relative to the support unit and the housing unit. Furthermore, it may be advantageous for the guide unit to have a further guide rod, in particular arranged parallel to the guide rod, which is designed to stabilize the support unit at least circumferentially around the guide axis relative to the housing unit.

[0035] Furthermore, it may be advantageous to make the coarse depth adjustment and / or the fine depth adjustment using the threaded element. Brief description of the drawings

[0036] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations. This is shown in the following: Fig. 1. An exemplary view of a hand-held power tool, Fig. 2 a perspective view of the support unit and the guide unit, Fig. 3 another perspective view of the support unit and the guide unit, Fig. 4 another perspective view of the support unit and the guide unit, Fig. 5 a section through the support unit and the guide unit, Fig. 6 a view of the coarse depth adjustment device and Fig. 7 a section through the control unit.

[0037] In the following figures, identical components are labelled with the same reference symbols.

[0038] Fig. Figure 1 shows a portable machine tool 12 designed as a router, comprising a support unit 14 which has a support surface 16 for resting on a workpiece and a through-hole 18 through which an insert tool 19 ( Fig. 3) can be passed through it for machining a workpiece (not shown in detail here). The through-hole 18 is designed as a material recess in the support unit 14, which forms a material opening compared to directly adjacent areas of the support unit 14. The through-hole 18 is designed as a through-bore. The support unit 14 is designed as a corner guide unit. Here, the support unit 14 has a circular segment-shaped basic form. The support unit 14 has at least one guide edge 20a, 20b, which, viewed in a plane running at least substantially parallel to the support surface 16, run at least substantially parallel to each other. The two guide edges 20a, 20b are further connected to each other by means of another arc-shaped guide edge 22 of the support unit 14. In addition, the two guide edges 20a, 20b have a geometric configuration as straight lines.

[0039] The hand-held power tool 12 has a tool holder in which a tool insert 19 is arranged and, in a state coupled to the hand-held power tool 12, can be guided through the guide opening 18 of the support unit 14 to machine a workpiece on which the support unit 14 rests with its support surface 16. The tool insert 19 extends beyond the support unit 14, so that in at least one operating state the tool insert 19 projects into the workpiece to be machined.

[0040] The hand-held power tool 12 comprises a housing unit 24 including a drive unit (not shown) for driving a tool 19 and optionally a gearbox (not shown), which are mounted in an outer housing 28 of the housing unit 24. For depth adjustment, the housing unit 24 is movably mounted relative to the support unit 14 by means of a guide unit 26 along a straight guide axis f of the guide unit 26.

[0041] The hand-held power tool 12 has a mounting unit 30, which is designed to hold a tool 19 and, in particular, to operate it by means of the drive unit. The mounting unit 30 is at least partially surrounded by the outer machine housing 28 in a radial plane of the guide axis f.

[0042] The hand-held power tool 12 has a depth adjustment device 32 ( Fig. 2) with a coarse depth adjustment device 34 for coarse depth adjustment and a fine depth adjustment device 36 for fine depth adjustment. The depth adjustments are guided by means of the guide unit 26, whereby the housing unit 24 is designed to be movable relative to the support unit 14 along a guide rod 42 of the guide unit 26.

[0043] For coarse depth adjustment, the coarse depth adjustment device 36 has a first actuating element 38 designed as a sliding element 38, which is further apart from the support unit 14 than a second actuating element 40 designed as a rotary wheel element 40 of the fine depth adjustment device 32.

[0044] The sliding element 38 forms a slide / push switch. The rotary knob element 40 rests on the support unit 14. The rotary knob element 40 is rotationally fixed to the guide rod 42. The guide rod 42 is rotatably mounted relative to the support unit 14 and the housing unit 24. The rotary knob element 40 limits the maximum depth adjustment in the axial direction of the guide axis f ( Fig. 5).

[0045] The guide rod 42 is at least essentially hollow cylindrical ( Fig. 4) formed. The guide rod 42 has, in the axial direction of the guide axis f, a threaded section 44 with a guide thread 44a, which comprises a substantially axial extension of the guide rod 42 and forms a first end 46a of the guide rod 42, and a positive locking section 48, which connects to the threaded section 44 in the axial direction of the guide axis f and forms a second end 46b of the guide rod 42.

[0046] The second end 46b of the guide rod 42 is positively locked in the axial direction of the guide axis f by means of a fixing element 50 designed as a fastening screw ( Fig. 5) connected to the support unit 14 and is rotatably mounted relative to the support unit 14. The second end 46b of the guide rod 42 is designed as a loose end.

[0047] The positive locking section 48 is surrounded by the rotary wheel element 40 in an assembled state and forms a positive locking connection with the rotary wheel element 40 in the direction of rotation about the guide axis f. The threaded section 44 essentially forms the axial extension of the guide rod 42.

[0048] The guide unit 26 has a further guide rod 52, which is intended to stabilize the support unit 14 at least in the circumferential direction around the guide axis f relative to the housing unit 24 and to enable uniform guidance.

[0049] The depth adjustment device 32 has a threaded element 54 designed as a half-thread with a thread axis g arranged parallel to the guide axis f. The threaded element 54 is in a receiving recess 56 ( Fig. 6) of the housing unit 24. The receiving recess 56 is designed to support the threaded element 54 in the radial direction of the guide axis f.

[0050] The threaded element 54 has an inner wall 54b with an internal thread 54a. The threaded element 54 is movably mounted along a radial direction of the guide axis f such that the thread 54a of the threaded element 54 is in an engaged state ( Fig. 2) is positively connected to the guide thread 44a of the guide rod 42 in the axial direction of the guide axis f and, in a disengaged state, is spaced apart from the guide rod 42 in the radial direction of the guide axis f, so that the thread 54a of the threaded element 54 is not positively connected to the guide thread 44a of the guide rod 42 in the axial direction of the guide axis f. The guide thread 44a is designed as an external thread and is arranged on an outer wall 44b of the guide rod 42. The thread axis g of the threaded element 54 is spaced apart from the guide axis f of the guide rod 42 in the disengaged state.

[0051] A depth is set by engaging and / or remaining in position the threaded element 54 with the guide thread 44a of the guide rod 42. The guide thread 44a of the guide rod 42 is provided for fine and coarse depth adjustment. The fine depth adjustment can be set along the entire axial extent of the guide thread 44a without using the coarse depth adjustment. This is achieved by rotating the rotary knob 40, which rotates the guide rod 42 connected to and guided by the threaded element 54. During this rotation, the thread 54a of the threaded element 54 is engaged with the guide thread 44a.

[0052] The first actuating element 38, designed as a sliding element 38, and the threaded element 54 are spring-mounted by means of a single return spring element 58. The return spring element 58 is designed to move the threaded element 54 from a disengaged state to an engaged state and, in the engaged state, to exert a spring force on the threaded element 54 in the radial direction of the guide axis f, in order to hold the threaded element 54 in the engaged state with the guide rod 42 in the axial direction of the guide axis f. The return spring element 58 is arranged in the housing unit 24 and is completely surrounded by the housing unit 24. The return spring element 58 is located at least partially below the outer machine housing 28 of the housing unit 24.

[0053] The first actuating element 38 can be designed to separate the threaded element 54 from the guide rod 42 in a release state and to connect the threaded element 54 to the guide rod 42 in a positive-locking manner in an engagement state.

[0054] The first actuating element 38 can contain or consist of a plastic. The first actuating element 38 can surround the guide rod in at least one plane by more than 180°. The threaded element 54 can overmold the actuating element 38. The threaded element 54 is positively connected to the actuating element 38.

[0055] In an alternative embodiment, the threaded element 54 can be designed as a threaded worm (not shown). It is understood that the threaded element 54 can be self-locking relative to the guide rod 42 of the guide unit 26. The threaded worm can have a thread axis that is angled to the guide axis f.

[0056] A spring element 60, designed as a compression spring, is provided between the housing unit 24 and the support unit 14. The spring element 60 is designed to exert a preload along the guide axis f in order to counteract a weight force of the housing unit 24 in a released state of the depth adjustment device and to preload the housing unit 24 relative to the support unit 14.

[0057] The guide rod 42, in its assembled state, has the spring element 60 ( Fig.7) which is surrounded in at least one radial plane of the guide axis f by the guide rod 42. The guide unit 26 further comprises a compensating rod 62, which is designed to be axially supported by the hollow guide rod 42 in an assembled state and to compress the spring element 60. The compensating rod 62 has a T-shaped section 64 which projects from the first end 46a of the guide rod 42 and covers the first end 46a of the guide rod 42. The guide rod 42 is arranged coaxially with the guide axis f.

[0058] The guide rod 42 is supported at its first end 46a by means of a bearing designed as a bushing (not shown) on the housing unit 24, in particular the outer machine housing 28. The bearing is designed as a sliding bearing. When using a sliding bearing, the first end 46a can have a cylindrical surface in the area of ​​the sliding bearing bushing, which is in particular free of a guide thread. This allows the guide rod 42 to be supported at both its first end 46a and its second end 46b. The second end 46b can be rotatably mounted relative to the support unit by means of a ball bearing. The first actuating element 38 and the second actuating element 40 are arranged between the first end 46a and the second end 46b of the guide rod 42.

[0059] The hand-held power tool can have a clamping device designed as a clamping screw, which is intended to connect the housing unit 24 to the further guide rod 52 in a form-fit and / or force-fit manner, so that a depth adjustment by means of the clamping device can be kept particularly effective and free of play.

Claims

[1] Hand-held power tool, in particular a router, with a housing unit (24) comprising a drive unit for driving an insert tool, with a support unit (14) which is movably mounted relative to the housing unit (24) for resting on a workpiece and with a guide unit (26) having a guide rod (42) for guiding the housing unit (24) relative to the support unit (14) along a guide axis (f), wherein the hand-held power tool has a depth adjustment device (32) with a coarse depth adjustment device (34) for coarse depth adjustment and with a fine depth adjustment device (36) for fine depth adjustment, wherein the coarse depth adjustment device (34) has a first actuating element (38) and the first actuating element (38) is spaced further apart from the support unit (14) than a second actuating element (40) of the fine depth adjustment device (36), characterized bythat the second actuating element (40) is designed as a rotary wheel element (40) which rests on the support unit (14) and is connected in a rotationally fixed manner to the guide rod (42), and that the first actuating element (38) is designed as a spring-loaded slide element (38) for coupling or decoupling a / the threaded element (54) to the guide rod (42). [2] Hand tool according to claim 1, characterized by in that the depth adjustment device (32) has a threaded element (54), in particular designed as a half-thread, with a threaded axis (g) arranged parallel to the guide axis (f), wherein the threaded element (54) and / or the guide rod (42) are movably mounted along a radial direction of the guide axis (f), wherein the threaded element (54) is mounted in the axial direction of the guide axis (f) so as to be connectable in a form-fitting manner to the guide rod (42). [3] Hand tool according to one of the preceding claims, characterized by that the guide rod (42) has a guide thread (44a) for fine depth adjustment and / or for coarse depth adjustment, wherein the fine depth adjustment is adjustable along an entire axial extent of the guide thread (44a) while avoiding use of the coarse depth adjustment. [4] Hand tool according to claim 2, characterized by that the threaded element (54) is spring-mounted in order to apply a spring force in the radial direction of the guide axis (f) to the threaded element (54) and in order to connect the threaded element (54) in an engaged state with the guide rod (42), in particular in a form-fitting manner along the guide axis (f). [5] Hand tool according to one of claims 2 or 4, characterized bythat the threaded element (54) and the first actuating element (38) are mounted by means of one, in particular a single, return spring element (58) which is arranged in the housing unit (24) and is surrounded by the housing unit (24), in particular completely. [6] Hand tool according to one of claims 2 or 4 and 5, characterized by that the threaded element (54) is designed as a threaded worm, wherein the threaded element (54) is mounted in a self-locking manner relative to the guide unit (26), in particular the guide rod (42) of the guide unit (26). [7] Hand tool according to one of claims 2 or 4 to 6, characterized by that a spring element (60), in particular designed as a compression spring, is provided between the housing unit (24) and the support unit (14), which is intended to bring about a preload along the guide axis (f). [8] Hand tool according to one of the preceding claims, characterized by in that the guide rod (42) has an external thread for coarse depth adjustment and for fine depth adjustment, wherein the guide rod (42) is rotatably mounted relative to the support unit (14) and the housing unit (24), wherein the guide unit (26) has a further guide rod (42), which is arranged in particular parallel to the guide rod (42) and is intended to stabilize the support unit (14) relative to the housing unit (24) at least in the circumferential direction about the guide axis (f). [9] Hand tool according to one of the preceding claims, characterized by that the coarse depth adjustment and / or the fine depth adjustment are carried out by means of the threaded element (54).

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