Machine tool in column design

Abstract

A machine tool (10) of column design, in particular a pillar drilling machine, with a column (12) on which a bearing bridge (18) for a working tool (22) is slidably mounted in the axial direction of the column (12), wherein the bearing bridge (18) is acted upon by a return spring (44) which is arranged in the area between the bearing bridge (18) and an associated stop element (46) which is adjustable on the column (12) in its axial direction and can be fixed in a predetermined operating position by means of a clamping lever (50), and wherein a complete machine head (24) is arranged on the bearing bridge (18) as a working tool (22), which contains a drive motor with gearbox in a housing (26) and has a tool holder (28), wherein a locking element (58) is provided which is designed to enable the bearing bridge (18) to be locked to the stop element (46), characterized in thatthat the locking element (58) has a spring element (62) designed in the manner of a strip-shaped spring clip, wherein a guide pin (84) is formed on the stop member (46) and the bearing bridge (18) has a recess (66), wherein the locking element is formed in the manner of a locking lever (90) which has on a first end section (92) a projection (94) that can be engaged in the recess (66) of the bearing bridge (18) and an opening (106) for receiving the guide pin (84) and on a second end section (96) an opening (100) for the passage of the clamping lever shaft (52), wherein a spring element, in particular a compression spring (104), is located between the locking lever (90) and the stop member (46).is arranged and that, by actuating the clamping lever (50), the locking lug (64) or the projection (94) automatically disengages from the recess (66) in the bearing bridge (18) when the stop member (46) is fixed on the column (12) and automatically engages in the recess (66) of the bearing bridge (18) when the stop member (46) is released on the column (12).

Description

State of the art

[0001] The invention relates to a machine tool of pillar design, in particular a pillar drilling machine, with a column on which a bearing bridge for a working tool is slidably mounted in the axial direction of the column, wherein the bearing bridge is acted upon by a return spring which is arranged in the area between the bearing bridge and an associated stop element which is adjustable on the column in its axial direction and can be fixed in a predetermined operating position by means of a clamping lever, and wherein a complete machine head is arranged on the bearing bridge as a working tool, which contains a drive motor with gearbox in a housing and has a tool holder.

[0002] Processing machines are already known from documents DE.38 40 018 A1 . DE 29 21 693 A1, FR 2 662 382 A1 and DE 10 2010 042 951 A1. Disclosure of the invention

[0003] One object of the invention is therefore to provide a new machine tool in a pillar design, in particular a pillar drilling machine, in which unintentional pendulum movements between a provided bearing bridge and an associated stop element can be safely and reliably prevented.

[0004] This problem is solved by a pillar-type machine tool, in particular a pillar drill, with a column on which a bearing bridge for a working tool is mounted so as to be axially displaceable along the column. The bearing bridge is acted upon by a return spring located in the area between the bearing bridge and an associated stop element. This stop element is adjustable along the column in its axial direction and can be locked in a predetermined operating position by means of a clamping lever. A complete machine head, comprising a drive motor with gearbox and a tool holder, is mounted on the bearing bridge as the working tool. A locking element is provided to enable the bearing bridge to be locked to the stop element.

[0005] The invention thus enables the provision of a machine tool in a stand design, in which a smooth and easy movement of the bearing bridge on the column is made possible by a simultaneous movement of the stop element and the bearing bridge locked to it, with the stop element released, i.e., not clamped and thus movable on the column.

[0006] According to one embodiment, the stop element has a clamping bracket with two legs which can be clamped onto the column by pivoting the clamping lever in a predetermined direction of rotation.

[0007] This allows a user to quickly clamp the stop element onto the column or detach it from it with one hand and a single movement.

[0008] Preferably, the first leg of the clamping bracket has a receptacle in which a screw nut is arranged in a rotationally fixed manner, in which the clamping lever shaft is rotatably received, and the second leg of the clamping bracket has an opening through which the clamping lever shaft of the clamping lever passes.

[0009] This transforms an already slight pivoting movement of the clamping lever into a linear movement for radially clamping the legs of the clamping bracket with a high clamping force on the column or for releasing the clamping connection of the legs on the column.

[0010] According to one embodiment, the locking element has a spring element designed in the form of a strip-shaped spring clip.

[0011] The invention thus enables the provision of a structurally simple, essentially one-piece construction of the locking element integrated into the stop member in conjunction with cost-effective and mass-production-ready manufacturing.

[0012] Preferably, the spring element has an opening for the passage of the clamping lever shaft.

[0013] This provides a structurally simple guide for the spring element, in addition to the through-cut function for the clamping lever shaft.

[0014] According to one embodiment, the bearing bridge has a recess and a first end section of the spring element is provided with a locking lug that can be inserted into the recess of the bearing bridge, wherein a second end section of the spring element is held, in particular clamped, on the first leg.

[0015] This design ensures a smooth and quiet engagement and disengagement of the locking lug into the recess, particularly in the case of a locking lug made of plastic. Furthermore, this embodiment guarantees the automatic engagement and disengagement of the locking element when the clamping lever is actuated.

[0016] According to a further embodiment, a guide pin is formed on the stop member and the bearing bridge has a recess, wherein the locking element is formed in the manner of a locking lever, which has at a first end section a projection that can be engaged in the recess of the bearing bridge and an opening for receiving the guide pin and at a second end section an opening for passing through the clamping lever shaft, wherein a spring element, in particular a compression spring, is arranged between the locking lever and the stop member.

[0017] Due to the integral design of the projection, no additional component is required to form a locking lug. Furthermore, this embodiment allows the use of a shorter spring element, and because of the compression spring, the spring action of the locking element can be dimensioned independently of the geometric design, in particular the material thickness and width, of the spring element. In this embodiment as well, automatic engagement and disengagement of the locking element upon actuation of the clamping lever is possible.

[0018] Preferably, when the clamping lever is actuated, the locking lug or projection automatically moves out of the recess in the bearing bridge when the stop member is fixed on the column and automatically into the recess of the bearing bridge when the stop member is released on the column.

[0019] This results in particularly easy handling for the user, as no further operating device is required to lock the bearing bridge and the stop element.

[0020] According to one embodiment, the locking element has a rotating hook that can be engaged with a locking bolt arranged on the bearing bridge.

[0021] The invention thus enables a mechanically reliable form-fit and force-fit locking mechanism that is particularly capable of withstanding higher axial forces.

[0022] Preferably, the rotating hook is arranged between the legs of the clamping bracket on a rotating hook shaft.

[0023] This results in a touch-proof integration of the rotating hook of the locking element into the stop member.

[0024] According to one embodiment, the rotary hook has a running surface with at least partially increased roughness, in particular knurling, which interacts with an elastic ring, in particular a rubber ring, arranged on the clamping lever shaft to engage the rotary hook with the locking bolt by means of a pivoting movement of the clamping lever.

[0025] This allows the clamping lever to slip if necessary, for example if the rotating hook encounters excessive mechanical resistance during the rotational movement and deformation of the rotating hook is imminent.

[0026] According to one embodiment, the rotary hook has a run-off surface with at least partial toothing, which interacts with a gear arranged on the clamping lever shaft to engage the rotary hook with the locking bolt by means of a pivoting movement of the clamping lever.

[0027] This results in a slip-free coupling between the clamping lever and the rotating hook.

[0028] According to one embodiment, the rotating hook interacts with an eccentric arranged on the clamping lever shaft by means of a coupling element, in particular a connecting rod, in order to engage the rotating hook with the locking bolt by means of a pivoting movement of the clamping lever.

[0029] This also results in a slip-free coupling between the clamping lever and the rotary hook, thus preventing uncontrolled rotation angle adjustment between the clamping lever and the rotary hook.

[0030] According to one embodiment, the rotating hook is arranged on the clamping lever shaft in a rotationally fixed manner.

[0031] The invention thus enables the provision of a gear-free locking element, since the rotating hook is driven directly by the clamping lever. Additional mechanical coupling elements, such as the rubber ring, the toothed gear, the eccentric, or the connecting rod, can therefore be omitted.

[0032] According to one embodiment, the locking element has a pinion shaft extending perpendicular to the clamping lever shaft, with a gear and an eccentric clamp, wherein the gear of the pinion shaft engages with a worm gear attached to the clamping lever shaft in order to engage the eccentric clamp with a recess in the bearing bridge by means of a pivoting movement of the clamping lever.

[0033] This results in a particularly high reduction effect between the rotary movement of the clamping lever and the eccentric clamp, while simultaneously enabling a compact design. The reduction effect of the worm gear used here also allows for very smooth, fluid, and responsive operation of the locking element.

[0034] According to one embodiment, the bearing bridge and the clamping bracket of the stop member can be locked together by means of a sliding element.

[0035] This allows for locking of the bearing bridge and stop element that is independent of the pivoting movement of the clamping lever.

[0036] The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawings. The drawings show: Fig. 1 a perspective front view of a machining tool designed as a pillar drilling machine, Fig. 2 a rear view of the machining machine from Fig. 1, Fig. 3 a perspective view of a section of Fig. 1 and Fig. 2 with a locking element according to a first embodiment, Fig. 4 a sectional view of the arrangement of Fig. 3 along the intersection line IV-IV in Fig. 3, Fig. 5 a side view of the at Fig. 3 shown excerpt from Fig. 1 and Fig. 2 with a locking element according to a second embodiment, Fig. 6 a sectional view of the arrangement of Fig. 5 along the intersection line VI-VI in Fig. 5, Fig. 7 a rear view of a section of the machining machine of Fig. 1 with a locking element according to a third embodiment, which has a central rotating hook, Fig. 8 a sectional view of the arrangement of Fig. 7 along the section line VIII-VIII in Fig. 7, Fig. 9 a side view of a locking element with rotating hook according to a fourth embodiment, Fig. 10 a side view of a locking element with rotating hook according to a fifth embodiment, Fig. 11 a rear view of a section of the machining machine of Fig. 1 with a locking element according to a sixth embodiment, which has a laterally arranged rotating hook, Fig. 12 a sectional view of the arrangement of Fig. 11 along the intersection line XII-XII in Fig. 11, Fig. 13 a rear view of a section of the machining machine of Fig. 1 with a locking element according to a seventh embodiment, which has a sliding element, Fig. 14 a sectional view of the arrangement of Fig. 13 along the intersection line XIV-XIV in Fig. 13, Fig. 15 a partially cut-away top view of the sliding element of Fig. 13 and Fig. 14 in locked position, Fig. 16 a partially cut-away top view of the sliding element of Fig. 13 and Fig. 14 in unlocked position, and Fig. 17 a partially cut-out rear view of a section of the machining machine of Fig. 1 with a locking element according to an eighth embodiment, comprising a worm and a pinion or gear.

[0037] Fig. 1 and Fig. Figure 2 shows an exemplary machine tool 10 in a pillar design, which is configured as a pillar drilling machine. However, it should be noted that the present invention is not limited to pillar drilling machines, but can also be applied to other pillar machine tools, e.g., a pillar milling machine or a pillar combination machine that enables drilling and / or milling, etc.

[0038] The processing machine 10 is designed specifically for use in DIY applications, but can also be used in industrial settings. For illustrative purposes, it features a hollow cylindrical column 12, which is vertically oriented in the operating position of the processing machine 10. The lower end of the column 12 is detachably attached to a base plate 14, for example by means of a clamp 16, and forms a right angle with the base plate 14.

[0039] A bearing bridge 18 is mounted on the column 12 so that it is axially displaceable along the column 12, i.e., longitudinally displaceable, as indicated by arrow 20. A working device 22 is attached to the bearing bridge 18. This working device is exemplified as a complete machine head 24, which is longitudinally displaceable along the column 12 in the direction of arrow 20, together with the bearing bridge 18. The exemplary machine head 24 has a housing 26, a drive motor with gearbox (not shown), and a tool holder 28, which is equipped with a chuck 30 in which, for illustrative purposes, a tool 32, e.g., a drill bit, is clamped.

[0040] A rack 34 is attached to or formed on the column 12, running approximately parallel to a longitudinal center axis 36 of the column 12. A gear 38 or pinion engages with the rack 34 and is non-rotatably connected to a shaft 40, which is rotatably mounted together with the shaft in the bearing bridge 18. A manually operated rotary element 42, for example in the form of a rotary knob or handwheel, is non-rotatably connected to the shaft 40. Every rotary movement of the gear 38 engaging with the rack 34 is transformed into a vertical movement of the bearing bridge 18 together with the machine head 24, whereby the machine head 24 can be moved in the direction of arrow 20 both downwards in a working direction and in the opposite direction, without any relative movement of parts of the machine head 24 to each other.

[0041] The bearing bridge 18 is acted upon by a return spring 44, which here is designed as a compression spring, in particular as a relatively strong cylindrical helical spring, which coaxially surrounds the column 12 at a small radial distance. The return spring 44 is supported at one end on the bearing bridge 18, while the other end of the return spring 44 is supported on a stop element 46 spaced axially from the rotary element 42. This stop element is adjustable in the axial direction of the column 12 and, via the return spring 44, bears the weight of the bearing bridge 18 with the machine head 24, the latter being held in a position by a predetermined spring force applied by the return spring 44. Fig. The machine head 24 is forced into the rest position shown in Figure 1, in which the bearing bridge 18, or a lower section thereof, rests axially against the stop member 46 from below. By adjusting the stop member 46 by longitudinal displacement on the column 12, the machine head 24 can be set to an application-specific operating position in which the tip of the insert tool 32 is located either in the vertical position shown or in a lower or higher position before work begins.

[0042] To set the application-specific operating position of the machine head 24, the fixed connection of the stop element 46 to the column 12 must be released. After reaching the application-specific operating position, the stop element 46 must then be firmly reconnected to the column 12. This is achieved by the stop element 46 having, among other things, a slotted clamping bracket 48, which can be clamped radially with respect to the column 12 by means of a pivotable clamping lever 50 and thus positively locked to it. The clamping bracket 48 incorporates, among other things, a clamping lever shaft 52 for supporting the clamping lever 50, and the clamping bracket 48, due to its slotted design, has two legs 54, 56. Another clamping lever, not designated with a reference numeral, serves to adjust a depth stop.

[0043] Fig. Figure 3 shows a first embodiment of the clamping bracket 48 of the stop element 46 of the processing machine 10. Fig. 1 and Fig. 2 with the bearing bridge 18 mounted on the column 12. According to the invention, the bearing bridge 18 can be locked to the stop member 46 via a locking element 58. For illustrative purposes, the locking element 58 has a spring element 62 designed in the manner of a strip-shaped spring clip with a locking lug 64, which can be inserted into a rectangular recess 66 of the bearing bridge 18, for example designed in the manner of an opening. The spring element 62 is, for example, made of a spring-elastic metal strip.

[0044] The clamping bracket 48 comprises the two legs 54, 56 of Fig. 2, which, for example, are drawn together by pivoting the clamping lever 50 from its shown unlocking position clockwise, as indicated by an arrow 60, into an associated locking position in order to fix the stop member 46 on the column 12.

[0045] In the Fig. In the unlocked position of the clamping bracket 48 shown in Figure 3, the stop element 46 is released, allowing it to slide freely along the column 12 in the axial direction. In this unlocked position, the locking lug 64 engages automatically in the recess 66 of the bearing bridge 18 due to the spring action of the spring element 62, thus locking them together positively and without friction, and preventing smooth movement of the bearing bridge 18 and the attached working tool 22. Fig. 1 is possible. The unlocking position is set, for example, by pivoting the clamping lever 50 in a direction opposite to arrow 60.

[0046] In the locked position, the spring element 62 is acted upon by the clamping lever 50 in the direction of the column 12, so that the locking lug 64 is disengaged from the recess 66 and the stop member 46 and the bearing bridge 18 are unlocked, so that the bearing bridge 18 with the attached working tool 22 is released from Fig. 1 is longitudinally displaceable along the column 12 against the spring force of the return spring 44 relative to the stop member 46.

[0047] Fig. Figure 4 shows the clamping bracket 48 of the stop element 46 of Fig. Figure 3, illustratively showing a clamping lever shaft 52. This shaft is rotatably mounted in an opening 68 in the second leg 56 and by means of an end threaded section in an internal thread of a nut 70. The nut 70 is rotationally fixed in a receptacle 72 within the first leg 54 of the clamping bracket 48, which points away from the clamping lever 50. The receptacle 72 has a cross-sectional geometry that approximately corresponds to a circumferential contour of the nut 70, so that the nut is held rotationally fixed in the receptacle 72.

[0048] By rotating the clamping lever 50, for example in the direction of arrow 60, the threaded section of the clamping lever shaft 52 is screwed into the nut 70, causing the legs 54 and 56 to move towards each other and the clamping bracket 48 to be firmly fixed or clamped onto the column 12. Conversely, by rotating the clamping lever 50 in the opposite direction, the legs 54 and 56 are detached from the column 12 due to their inherent tension, thereby releasing the clamping bracket 48 of the stop element 46 from the column 12. The direction of rotation of the clamping lever 52 required to secure the stop element 46 or the clamping bracket 48 to the column 12 can be determined by the design of the end threaded section on the clamping lever shaft 52 and the corresponding internal thread of the nut 70 as either a left-hand or right-hand thread.

[0049] The spring element 62 comprises, for illustrative purposes, a first end section 74, a second end section 76, and two central sections 78 and 80 formed approximately at right angles to each other. In the cross-sectional view according to... Fig. 4 The spring element 62 has an approximately L-shaped geometric shape.

[0050] The locking lug 64 is positioned on the first end section 74, while the second end section 76 is bent in an approximately U-shape and lies in the receptacle 72 to simultaneously secure the position of the spring element 62. The end section 76 may have a wave-like feature to secure the position of the spring element 62 on the stop member 46 by means of a spring-like fit in the receptacle 72. Both central sections 78, 80 also enclose the rear sides of the legs 54, 56, with the central section 80 having a further wave-like feature that, for example, can contribute to further securing the position of the spring element 62 in a corresponding recess of the second leg 56. An opening 82 for the passage of the clamping lever shaft 52 is provided in the central section 80, thereby simultaneously guiding the spring element 62.Furthermore, an offset can be incorporated into the central section 80 of the spring element 62 to ensure spacing between the locking lug 64 and the leg 56 when the clamping lever 50 is engaged. To further optimize the guidance of the locking lug 64 and the spring element 62, a guide pin 84 is formed on the leg 56, which can be inserted into a correspondingly shaped recess 86 in the locking lug 64 and in the spring element 62. The guide pin 84 can, for example, have a circular or a square cross-sectional geometry.

[0051] By rotating or pivoting the clamping lever 50 clockwise, i.e. in the direction of arrow 60, the clamping bracket 48 is locked onto the column 12, whereby the central section 80 of the spring element 62 in the area of ​​the opening 82 is pressed by the clamping lever 50 against the second leg 56 in such a way that the central section 80 rests against it and a disengaged position of the locking lug 64, shown with a solid line, is reached, in which the locking lug 64 is disengaged from the recess 66. By means of an opposing rotational movement of the clamping lever 50, the clamping bracket 48 is released again from the column 12, whereby the central section 80 of the spring element 62 is released from the clamping lever 50 in the area of ​​the opening 82, so that the central section 80 can lift off from the leg 56 and the locking lug 64 thus engages automatically in the recess 66 due to the spring force of the spring element 62 - as shown by the dotted line.

[0052] The spring element 62 can, for example, be formed in one piece from a spring-elastic metal or sheet metal blank by appropriate bending, while the locking lug 64 can, for example, be manufactured from a plastic material using injection molding. The locking lug 64 can, for example, be injection-molded onto the first end section 74 of the spring element 62, snapped onto it as a separate component, or attached in another way. To enable the locking lug 64 to snap onto the first end section 74 of the spring element 62, a suitably shaped additional recess in the first end section of the spring element 62 is required.

[0053] Fig. Figure 5 shows the clamping bracket 48 of the stop member 46 with the two legs 54, 56 and the bearing bridge 18 of the machining machine 10. Fig. 1 and Fig. 2 with a locking element 90 (104 in Fig. 6) according to a second embodiment. This embodiment includes, for illustrative purposes, a locking lever 90 and a spring element (104 in Fig. 6) on.

[0054] At a first end section 92 of the locking lever 90, a projection 94 is formed, arranged approximately at right angles to it. For illustrative purposes, this projection has a narrower width than the locking lever 90 and can be inserted, at least partially, into the recess 66 of the bearing bridge 18 in order to lock the stop member 46 to the bearing bridge 18 when the clamping bracket 48 is released. The projection 94, unlike the locking lug 64, is Fig. 3 and Fig. 4 formed in one piece on the locking lever 90. In addition, unlike the spring element 62 of Fig. 3 and Fig. 4. The locking lever 90 need not necessarily be made of a spring-elastic material, but can alternatively be made of a rod-shaped, inelastic metal or steel material. The projection 94 can be formed, for example, by punching and bending.

[0055] Fig. Figure 6 shows the clamping bracket 48 of the stop member 46 with the bearing bridge 18 and the column 12 of Fig. 5, whose structure is essentially the same as the structure of Fig. 3 and Fig. 4 corresponds. In contrast, however, the one from the locking lever 90 is Fig. 5 and a spring element 104 designed as a compression spring forming a locking element 90, 104 of Fig. 5 arranged on the clamping bracket 48, as described below.

[0056] For illustrative purposes, the locking lever 90 has a second end section 96, which is arranged, at least partially, in a recess 98 or a depression of the second leg 56 of the clamping bracket 48 facing the clamping lever 50. This second end section 96 includes, for example, an opening 100 for the passage of the clamping lever shaft 52, which, in conjunction with the rectangular recess 98 in the second leg 56, ensures sufficient fixation of the locking lever 90 to the clamping bracket 48. Furthermore, an offset 102 is provided on the locking lever 90 in the area of ​​the opening 100, among other things to achieve a distance between it and the leg 56. To ensure a reliable, rattle-free fit of the locking lever 90 to the clamping bracket 48, the compression spring 104 is arranged between the locking lever 90 and the leg 56, wherein the compression spring 104 is... B. in an associated recess in leg 56 orthe locking lever 90 is secured in position by a slight press fit or in some other way. To further optimize the guidance of the locking lever 90, it has a further opening 106 in the area of ​​the projection 94 for a guide pin 84, which is formed, for example, integrally on the clamping lever-side leg 56.

[0057] Fig. 7 and Fig. Figure 8 shows the bearing bridge 18 and the stop element 46 with clamping bracket 48. Fig. 1 and Fig. 2 with a locking element 110, 114 according to a further embodiment, which for illustrative purposes comprises a rotating hook 114. This is for illustrative purposes engaged with a transversely extending locking bolt 116, which is formed on the bearing bridge 18. This enables a positive and force-fit locking of the stop member 46 on the bearing bridge 18.

[0058] Here, for example, on the clamping lever shaft 52 of the clamping lever 50 associated with the clamping bracket 48, Fig. 1 and Fig. 2 A rubber ring 110 is attached in a rotationally fixed manner, which, for example, runs on a knurled running surface 112 of the rotary hook 114. This is shown to be pivotably mounted on a rotary hook shaft 118, which is fixed in the legs 54, 56 of the clamping bracket 48.

[0059] If the clamping lever 50 is pivoted, for example, in the direction of arrow 60, the stop element 46 is clamped onto the column 12, while at the same time the rotary hook 114 is disengaged from the locking bolt 116, so that the bearing bridge 18 and the stop element 46 are unlocked from each other. In this process, the rubber ring 110 and the rotary hook 114 always rotate in opposite directions. Instead of the rubber ring 110, a roller with a suitable running surface exhibiting a high coefficient of friction or roughness can also be used.

[0060] Due to the knurled running surface 112, a frictional connection is formed between the rubber ring 110 and the rotating hook 114. This causes the rotating hook 114 to slip when a limit torque is exceeded. This can occur, for example, if the rotating hook 114 strikes the locking bolt 116 and the clamping lever 50 continues to pivot.

[0061] Fig. 9 and Fig. Figure 10 shows two further possible embodiments of locking elements for locking the bearing bridge 18 on the clamping bracket 48 of the stop member 46 of Fig. 1 and Fig. 2. Unlike Fig. 7 and Fig. 8 is in the Fig. 9 instead of the rubber ring 110 a gear or pinion 120 is provided and arranged on the clamping lever shaft 52 in a rotationally fixed manner.

[0062] In Fig. 10 is different from Fig. 7, Fig. 8 to Fig. 9 instead of the rubber ring 110 or the pinion 120 an eccentric 122 is arranged on the clamping lever shaft 52 in a rotationally fixed manner, which pivots the rotary hook 114 via a connecting rod 124.

[0063] It should be noted that in all embodiments of the locking element of Fig. 7, Fig. 8 to Fig. 9. The ratio between an imaginary circumference of the respective running surface of the rotary hook and the rubber ring or the pinion is, for example, approximately 2:1. Corresponding assumptions apply to a transmission ratio of a coupling between clamping lever shaft 52 and rotary hook 114 by means of connecting rod 124 and eccentric 122. Fig. 10.

[0064] Fig. 11 and Fig. Figure 12 shows a further embodiment of a locking element 130 for locking the bearing bridge 18 on the clamping bracket 48 of the stop member 46 of Fig. 1 and Fig. 2. In contrast to the previous embodiments of Fig. 7, Fig. 8, Fig. 9 to Fig. 10 Here, a rotary hook 130 is not attached between the two legs 54, 56 of the clamping bracket 48 on the separate rotary hook shaft 118, but for illustrative purposes is arranged directly on the clamping lever shaft 52 between the clamping lever 50 and the second leg 56 of the clamping bracket 48 facing it.

[0065] For the positive and non-positive locking of bearing bridge 18 and stop member 46, a locking bolt 132 is formed on the bearing bridge 18, running approximately parallel to the clamping lever shaft 52. Starting from the in Fig. In the locking position shown in Figure 12, the rotary hook 130 is unlocked, for example, by pivoting it in the direction of an arrow 134 from the locking bolt 132.

[0066] Fig. 13 and Fig. Figures 14 and 144 show a further embodiment of a locking element 140, 144 for locking the bearing bridge 18 on the clamping bracket 48 of the stop member 46. Fig. 1 and Fig. 2.

[0067] This illustrates a sliding element 140, which is horizontally displaceable in the stop member 46 parallel to the clamping lever shaft 52, and a locking head 144, wherein the desired positive and force-fit locking between the bearing bridge 18 and the stop member 46 is effected by horizontally displacing the sliding element 140 in the direction of an arrow 142, e.g., independently of the position of the clamping lever 50. The locking head 144 is connected to the bearing bridge 18 by means of a retaining web 146.

[0068] In the Fig. In the locking position of the sliding element 140 shown in Figure 14, the mushroom-shaped locking head 144, which is formed by way of example on the bearing bridge 18, is arranged behind a recess 148 in the sliding element 140, wherein this recess is designed to block the locking head 144 at least partially as in Figure 14. Fig. 15 and Fig. 16 describes a width which is smaller than a corresponding width of the mushroom-shaped locking head 144.

[0069] Fig. Figure 15 shows the sliding element 140 with the locking head 144 and the recess 148 of Fig. 13 and Fig. 14 in the locked position of Fig. 13, while Fig. 16 the sliding element 140 with the locking head 144 and the recess 148 of Fig. 13 and Fig. Figure 14 illustrates the sliding element 140 in a corresponding unlocked position. As an example, a knurled or ribbed rectangular handle 158 is provided on the sliding element 140, which, for example, has a greater width than the sliding element 140 itself to facilitate gripping by a user.

[0070] For illustrative purposes, the recess 148 has a square section 150 and a rectangular section 152 that merge into one another. The square section 150 is dimensioned such that the mushroom-shaped locking head 144 can pass through it unhindered perpendicular to the plane of the drawing, i.e., in the axial direction of the column 12, for unlocking. In contrast, the rectangular section 152 is dimensioned such that the retaining web 146 can pass through it when the sliding element 140 is moved, preferably with a slight clearance fit, but the locking head 144 cannot, thus enabling the locking of the bearing bridge 18 on the clamping bracket 48 of the stop member 46.

[0071] Is the sliding element 140 starting from the in Fig. If the locking position shown in section 15 is moved by a user, e.g. in the direction of arrow 154, the bearing bridge 18 and stop element 46 are moved independently of the respective position of the clamping lever 50. Fig. 1 and Fig. 2 unlocked. If, however, the sliding element 140 is moved from the position shown in Fig. If the unlocking position shown in 16 is moved in the opposite direction, i.e. in the direction of an arrow 156, the bearing bridge 18 and the stop member 46 are locked together.

[0072] Fig. Figure 17 shows a further embodiment of a locking element 170, 172, 176 for locking the bearing bridge 18 on the clamping bracket 48 of the stop member 46 of Fig. 1 and Fig. 2. This shows, for illustrative purposes, a worm gear 170 and a gear or pinion 172 with a small number of teeth, as well as an eccentric clamp 176.

[0073] The worm gear 170 is, by way of example, arranged in a rotationally fixed manner on the clamping lever shaft 52, which engages with the pinion 172, which in turn is fixedly mounted on a pinion shaft 174. The pinion shaft 174 runs approximately perpendicular to the horizontal clamping lever shaft 52 or to a longitudinal axis of the column 12 and is supported approximately centrally between the legs 54, 56 of the clamping bracket 48. A substantially cylindrical eccentric clamp 176 is also formed or mounted on the pinion shaft 174, which interacts with a recess 178 in the bearing bridge 18 and a projection 180 provided thereon. In the Fig. In the position of the eccentric clamp 176 shown with a drawn line, the bearing bridge 18 is positively and positively locked to the clamping bracket 48 of the stop member 46, since the eccentric clamp 176 rests behind or below the projection 180 of the housing of the bearing bridge 18.

[0074] The eccentric clamp 176 is arranged by way of example on the underside of the bearing bridge 18, i.e. the eccentric clamp 176 points towards the base plate 14 of the machine tool 10. Fig. 1. If the worm 170 twists as a result of a pivoting movement of the clamping lever 50, the pinion 172 and thus also the pinion shaft 174 are set into rotation, which allows the eccentric clamp 176 to pivot in the direction of an arrow 182.

[0075] If the clamping lever 50 is now rotated or pivoted, for example, in the direction of arrow 60 to clamp the clamping bracket 48 of the stop member 46 onto the column 12, the eccentric clamp 176 and the pinion shaft 174 rotate in the direction of arrow 182 until a fully unlocked position of the eccentric clamp 176, shown by the dotted line, is reached. In this unlocked position, the eccentric clamp 176 can preferably move with sufficient mechanical play through the corresponding recess 178 in the housing of the bearing bridge 18 and thus in the axial direction of the column 12. This allows the bearing bridge 18 to move in the axial direction of the column 12 relative to the stop member 46, which is then clamped onto the column 12.

Claims

[1] A machine tool (10) of column design, in particular a pillar drilling machine, with a column (12) on which a bearing bridge (18) for a working tool (22) is slidably mounted in the axial direction of the column (12), wherein the bearing bridge (18) is acted upon by a return spring (44) which is arranged in the area between the bearing bridge (18) and an associated stop element (46) which is adjustable on the column (12) in its axial direction and can be fixed in a predetermined operating position by means of a clamping lever (50), and wherein a complete machine head (24) is arranged on the bearing bridge (18) as a working tool (22), which contains a drive motor with gearbox in a housing (26) and has a tool holder (28), wherein a locking element (58) is provided which is designed to enable the bearing bridge (18) to be locked to the stop element (46), characterized by, that the locking element (58) has a spring element (62) designed in the manner of a strip-shaped spring clip, wherein a guide pin (84) is formed on the stop member (46) and the bearing bridge (18) has a recess (66), wherein the locking element is formed in the manner of a locking lever (90) which has on a first end section (92) a projection (94) that can be engaged in the recess (66) of the bearing bridge (18) and an opening (106) for receiving the guide pin (84) and on a second end section (96) an opening (100) for the passage of the clamping lever shaft (52), wherein a spring element, in particular a compression spring (104), is located between the locking lever (90) and the stop member (46),is arranged and that, by actuating the clamping lever (50), the locking lug (64) or the projection (94) automatically disengages from the recess (66) in the bearing bridge (18) when the stop member (46) is fixed on the column (12) and automatically engages in the recess (66) of the bearing bridge (18) when the stop member (46) is released on the column (12). [2] Processing machine (10) according to claim 1, characterized by , that the stop member (46) has a clamping bracket (48) with two legs (54,56) which can be clamped onto the column (12) by pivoting the clamping lever (50) in a predetermined direction of rotation. [3] Processing machine (10) according to claim 2, characterized by, that the first leg (54) of the clamping bracket (48) has a receptacle (72) in which a screw nut (70) is arranged in a rotationally fixed manner, in which the clamping lever shaft (52) is rotatably received, and that the second leg (56) of the clamping bracket (48) has an opening (68) through which the clamping lever shaft (52) of the clamping lever (50) passes. [4] Processing machine (10) according to claim 1, characterized by that the spring element (62) has an opening (82) for the passage of the clamping lever shaft (52). [5] Processing machine (10) according to claim 4, characterized by , that the bearing bridge (18) has a recess (66) and a first end section (74) of the spring element (62) is provided with a locking lug (64) which can be inserted into the recess (66) of the bearing bridge (18), wherein a second end section (76) of the spring element (62) is held on the first leg (54), in particular clamped. [6] Processing machine (10) according to one of claims 1 to 3, characterized by , that the locking element has a rotating hook which can be engaged with a locking bolt (116) arranged on the bearing bridge (18). [7] Processing machine according to claim 9, characterized by , that the rotary hook is arranged between the legs (54,56) of the clamping bracket (48) on a rotary hook shaft (118). [8] Processing machine (10) according to claim 10, characterized by , that the rotary hook has a running surface with at least a sectionally increased roughness, in particular a knurling, which interacts with an elastic ring, in particular a rubber ring, arranged on the clamping lever shaft (52) to engage the rotary hook with the locking bolt (116) by means of a pivoting movement of the clamping lever (50). [9] Processing machine (10) according to claim 10, characterized by, that the rotary hook has a run-off surface with at least partial toothing which interacts with a gear arranged on the clamping lever shaft (52) to engage the rotary hook with the locking bolt (116) by means of a pivoting movement of the clamping lever (50). [10] Processing machine (10) according to claim 10, characterized by , that the rotary hook interacts with an eccentric arranged on the clamping lever shaft (52) by means of a coupling element, in particular a connecting rod, in order to engage the rotary hook with the locking bolt (116) by means of a pivoting movement of the clamping lever (50). [11] Processing machine (10) according to claim 9, characterized by , that the rotary hook is arranged so as to be non-rotatable on the clamping lever shaft (52). [12] Processing machine (10) according to one of claims 1 to 3, characterized by, that the locking element has a pinion shaft extending perpendicular to the clamping lever shaft (52) with a gear and an eccentric clamp, wherein the gear of the pinion shaft engages with a worm gear attached to the clamping lever shaft (52) in order to engage the eccentric clamp with a recess (178) in the bearing bridge (18) by means of a pivoting movement of the clamping lever (50). [13] Processing machine (10) according to one of claims 1 to 3, characterized by , that the bearing bridge (18) and the clamping bracket (48) of the stop member (46) can be locked together by means of a sliding element (140).

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