EP1642686A2 - Drill support - Google Patents

Abstract

The support stand (1) for an electric drill (2), and move it on the drilling direction (10), has a drill holder and a mechanism to move it forwards in relation to at least one guide rod (11). The assembly has a handle (5) at right angles to the drilling direction together with an integrated operating grip (6) for both to be used together by one hand.

Description

1. Application

The invention relates to a drill stand for receiving and guiding a particular electric hand drill and especially the forward pressing of the drill with a high feed force against the workpiece.

ll. Technical background

The leadership of a hand drill only by the hand or the two hands of the user has the disadvantage that the applicable feed force of the physical strength and working position of the user depends on the workpiece.

The result is that larger holes, especially in hard materials like steel, do not have to be made all at once, but by pre-drilling with a small diameter and widening with a larger hole diameter, and the exact positioning of the hole is difficult and always the same permanent angular alignment of the drill with the drill during the drilling process is not ensured.

This also often leads to incorrectly positioned or inclined or not round, but milled holes or breakage of the drill, especially since the pressure force is often applied obliquely by the user only roughly controlled by the user can. The failure of the drill after drilling is hardly avoidable and leads to damage to the drill or workpiece.

Even keeping an always accurate hole depth is also poorly possible.

There are so far already available drill stands, which have a receiving device for inserting and clamping the drill, and a feed device by means of which the receiving device, together with the drill defined along a guide rod of the drill stand and can always be pushed forward exactly in the drilling direction.

The workpiece can also be the top of the foot plate, which is located at the lower end of the guide rod querragend of this, are placed, said foot plate - the i. R. extends laterally beyond the bore axis and in the area having a passage - can still have adjustable stops or other fastening and clamping parts, so that several identical holes can be performed quickly in succession on different workpieces without readjustment.

Such drill stands are therefore primarily intended for laying or placing a smaller, at least still movable, work piece on top of the base plate of the drill stand, which may be e.g. stable by its own weight or screwed on the workbench.

As a drive for the forward movement of the receiving device together with the drill a laterally arranged on the drill stand handwheel or a pivotable lever drive is used, which is continuously actuated by the user during the drilling process to achieve the Bohrfortschrittes.

• das Ansetzen und Bohren mit einer Handbohrmaschine an vor allem großen Werkstücken, die nicht in den stationär stehenden Bohrständer eingelegt werden können und
• für einfache Handhabung im mobilen Einsatz.

However, such drill stands are not well suited for due to their size and weight and design of the foot plate

• The preparation and drilling with a hand drill on especially large workpieces that can not be placed in the stationary drill stand and
• for easy handling in mobile use.

III. Presentation of the invention a) Technical task

It is therefore the object of the invention to provide a drill stand, which in addition to the stationary use of the known drill stand also allows a practical mobile use of large workpieces and in particular the application of high feed forces and the maintenance of an exact angle while drilling to the workpiece.

b) Solution of the task

This object is solved by the claims 1, 11, 16 and 36. Advantageous embodiments will be apparent from the dependent claims.

(Functional features :)

Characterized in that the drill stand on the one hand has a transversely projecting handle and on the other hand an actuating handle for actuating the feed device, the entire drill stand can be held in position in any position relative to the workpiece, ie horizontally or overhead, and yet simultaneously actuates the feed device become.

By a corresponding translation of the movement of the actuating handle, the feed device can be advanced with very high feed force against the workpiece, without the necessary manual force of the user must be too large.

By arranging the handle and / or the operating handle on the receiving device, these handles move together with the drill relative to the workpiece, whereby the feeling for the Bohrfortschritt is maintained.

In that the same hand that holds the handle, at the same time with the four fingers of this hand grip the operating handle and can operate, only one hand is necessary for holding and pressing the drill stand, so that the other, i. R. the right hand, the handle of the drill can hold itself.

(1st alternative solution :)

Handle and operating handle can also be funktionsvereinigt by the handle is automatically, for example, rotatable or pivotable, with respect to the receiving device.

So z. B. a rotational movement of the handle about its longitudinal axis via a gear, for example. A worm / worm gear and / or a rack, are implemented in a movement of the receiving device relative to the guide rod.

Such worm / worm gear can be self-locking, so that after completion of the rotation and release the handle of the drill is not or only very slightly withdrawn. Another advantage is that even a backward movement of the drill with the same translation and thus a high force in the reverse direction is possible.

Accordingly, not even a freewheel on the rotatable handle is necessary for this solution, since after appropriate rotation by about a quarter Rotation, let go of the user's hand, reach around and continue to turn the handle. If you want to avoid this embrace, a freewheel is necessary, which causes the turning back of the handle, the drill is not withdrawn. Disadvantage is that then for the backward movement a separate device is needed.

Also, a pivoting movement of such a handle about an axis transverse to its longitudinal extent, for example in the manner of a ratchet and possibly also switchable in its effective direction, is conceivable. Preferably, the pivot axis is not only transverse to the longitudinal extent of the handle, but also transverse to the extension direction of the guide rod.

Nevertheless, in this case, the functionally combined handles of the handle rotatable about its longitudinal axis are to be preferred, since thereby the basic position of the handle remains unchanged, which is advantageous for holding the drill stand.

(Main solution and its advantages)

By a retraction device for fast retraction of the feed device relative to the drill rig against the drilling direction of the drill is quickly withdrawn from the well after completion of the bore to minimize the non-productive times against a manual retraction.

By arranging a retraction switch and in particular a spring preload the retraction device is the rapid retreat after pressing a retraction switch automatically and without effort.

If the pull-back switch is arranged in the grip area of the thumb or one of the other fingers of a hand that holds the handle, the pull-back device can also be operated with the same hand of the user holding the handle, so that the other hand on the drill can stay.

In a particularly advantageous embodiment, however, the operating handle is a separate handle, designed as a pivotable clamping lever, which is arranged relative to the handle on the receiving device that he can be used with the four fingers of that hand holding the handle to the handle and after releasing back from there pivots back due to its spring preload.

Normally, the drill stand according to the invention is used so that the workpiece between the drill of the drill and the base plate of the drill stand, in which the forward direction of the guide rod ends are mounted, is inserted, and thus during drilling, the workpiece on top of the Supported foot plate, against which it is pressed by the feed force, which is applied by means of the clamping lever or actuating handle.

The amount of applicable feed force thus depends - in addition to the stability of the entire device - mainly from the ratio between the operating handle and the feed device.

In addition to the foot plate, the drill stand may comprise a base plate into which the foot plate can be inserted, in particular inserted from the side and then held in a form-fitting manner in and against the drilling direction.

The base plate may, for example, the fixed arrangement, e.g. Screwing, serve on a workbench or even a temporary fixation, for. by means of negative pressure on a larger workpiece.

With the help of such, to be fastened on the workpiece, for example by means of vacuum, base plate holes can then be made with a greater distance to the outer edge of the workpiece, as it allows the distance of the drilling axis of the guide rods by the base plate and thus also the base plate of the Drill stand with its underside placed on the workpiece and fixed by means of external clamping devices.

The fixing force on the workpiece must of course be higher than the feed force with which the drill is then pressed against the workpiece, otherwise this would lead to detachment of the base plate.
To fix a recessed in the bottom of the base plate from the edge, preferably used, circumferential ring seal is used, the enclosed space of a vacuum source is connectable. The vacuum source will preferably be an injector vacuum generator which is operated by means of compressed air, and in which by means of a special nozzle arrangement, through which the compressed air is guided, a negative pressure is generated.

For the usual use, so a resting on the top of the base plate workpiece, conventional clamping claws or other fastening devices may be present on this top. This makes it possible to firmly locate the footplate of the drill stand at a particular position of the workpiece, and without changing the position of the drill stand at that position of the workpiece, multistage drilling operations such as piercing and then attaching e.g. Threaded hole to perform by interchangeably when left in the drill rig drill there the drill is changed to a countersink, etc. This is easily possible in mobile use because of the fixation on the workpiece.

As a drive for the receiving device relative to the guide rods of the drill stand, a step drive is preferably used, which shifts the drill gradually against the workpiece.

By arranging a stepper drive with a reciprocable clamping lever (operating handle) on the feed device, the actuation of the drill stand is initially possible in one direction, the drilling direction, by means of the holding hand of the user himself.

By the feed device has a handle-like shaped part (handle), and the clamping lever (operating handle) is also arranged there, the simultaneous holding and pressing the drill stand is possible with one hand of the user.

By pressing an optional switch, the direction of movement of the feed device can be adjusted in the opposite direction, which means that is changed from drilling to retraction.

By arranging the switch on the feed device in the grip region of the user's hand, in particular the user's thumb, this switchover can again be carried out by the same hand of the user without the need for a second hand.

By the switch next to the two end positions, which correspond to the two directions of movement, occupy a central position, this center position can be used for that the feed device relative to the base plate in both directions of movement is freely displaceable.

(Step driving)

In this case, the step drive to be used in the drill stand, which is explained in principle in FIG. 2, may have the following special features:

Thus, the direction of action of the stepper drive can be adjusted by the fact that the pivoting direction of the push arm from the starting position to the operating state in the clockwise or counterclockwise direction, and in particular for this purpose, the push arm, when it assumes the starting position, be displaced, be shifted in particular in the longitudinal direction, so that its operating end with a different area than before, that is, with another active surface of the clamping lever, in contact.

Preferably, in this conversion, the push arm, which is preferably in its deactivated position, is displaced and pivoted relative to the push rod in the longitudinal direction and pivoted, from a positive angle relative to the transverse direction to a negative angle and vice versa.

Due to the displaceability of the support end of the push arm, this can be done very easily, especially with the help of the switch to which an operative connection, for example by means of a spring, in particular a combined tension spring which springs both in the pressure direction and in the tension direction, thus for both Effective directions near the support end and therefore biasing the arm pushes into the starting position.

Also, the support arm is biased by a Stützarmfeder in the starting position.

Also, the clamping lever itself is biased by means of a clamping lever spring in its initial position, in which he goes back to release to relocate by re-actuation the push arm.

• bei aktiver Positionierung des Umschalters in einer der beiden Endstellungen (Über-Totpunkt-Positionen) in der gewählten Funktionsstellung verbleibt, und
• ohne aktive Positionierung der Umschalter die neutrale Mittelstellung anfährt, in der die Schubstange in beide Richtungen frei verschiebbar ist.

By taking one of two over-dead-center positions of the push arm, in particular its operating end, with respect to the clamping lever ensures that

• remains active in the selected functional position with active positioning of the switch in one of the two end positions (over-dead-center positions), and
• without active positioning of the switch the neutral center position anfährt, in which the push rod is freely displaced in both directions.

Due to the different contouring of the active edges on the clamping lever for the two functional positions of the push arm of the force curve and the absolute force height, which are applied during the operation of the clamping lever of the active drive, can be specified differently.

Due to the pivotability of the support arm relative to the transverse direction from one to the other inclined position and the support arm is adjustable according to the two directions of action.

By the support arm is also converted from the switch by means of a preferably mechanical connection, in particular a combined tension spring, can be converted by means of a single switch the entire stepper drive in its direction of action at a time.

By the bearing of the clamping lever to a bearing pin whose position is not fixed, but is movable, and which is in particular in a pivotable bearing arm, the action of the spring which biases the support arm can be supported by the bearing pin in the pivotable bearing arm with respect to the pivot point the bearing arm is arranged so that the pressure exerted by the clamping lever - when actuated - on the bearing arm pressure increases the bias of the support arm in the prestressed support position and conversely favors the release of the clamping of the support arm when changing the effective direction.

As a result, since both the clamping lever and the support arm are located in the gripping area of the gripping handle arranged therebetween, both can be actuated by the hand holding the gripping handle as required.

The bias of the support arm in its activated position is chosen so that it can be solved by pressing the free end, the operating end of the support arm, by the thumb of the user. In this way, a handling of the drill stand is possible, in which the drill stand itself, with one hand and the recorded therein drill gripped the drill handle with the other hand, positioned at the desired location of the workpiece and pressed and the drill with the desired Preload force is advanced against the workpiece. Because of the guide by drill stand and its base plate is the right-angled

Positioning of the drill to the workpiece without problems einnehmbar and also maintainable.

Thanks to the sensitively movable clamping lever, a high pre-pressing force can still be applied in a well-dosed manner and thus a uniform feed can be achieved, which enables the introduction of large holes without pre-drilling and thus the efficient setting of holes.

c) embodiments

Fig.1:

den erfindungsgemäßen Bohrständer in perspektivischen Darstellungen,

Fig. 2:

einen Schrittantrieb gemäß dem Stand der Technik,

Fig. 3:

einen ersten Schrittantrieb des Bohrständers,

Fig. 4:

eine Basisplatte für den Bohrständer, und

Fig. 5:

einen zweiten Schrittantrieb für den Bohrständer.

Fig. 6:

einen weiteren Schrittantrieb sowie

Fig. 7:

zum Schrittantrieb alternative Antriebe.

Embodiments according to the invention are described in more detail below by way of example. Show it:

Fig.1:

the drill stand according to the invention in perspective views,

Fig. 2:

a step drive according to the prior art,

3:

a first step drive of the drill stand,

4:

a base plate for the drill stand, and

Fig. 5:

a second stepper drive for the drill stand.

Fig. 6:

another stepper drive as well

Fig. 7:

for stepper drive alternative drives.

1 a shows the drill stand 1 with the two parallel, perpendicular to the base plate 7 guide rods 11, which have a round outer periphery, and along which the receiving device 3 in the drilling direction 10th is displaceable, in which the hand drill 2 is clamped with her neck and with the drill down in the direction of the foot plate 7, pointing tense.

For this purpose, the receiving device 3, which is penetrated by the two guide rods 11a, b comprises a transversely to the guide rods 11 extending transverse plate 11a, in which a cantilevered end a bracing receiving eye 3b for insertion and clamping of the outer periphery of the neck a hand drill, and at. With respect to the guide rods 11 opposite free end a handle 5, which protrudes with its longitudinal extent transverse to the drilling direction 10, for holding the most left hand of the user, while the right hand of the user the pistol-like handle of the hand drill holds.

Due to the symmetrical design of the drill stand also suitable for left-handers.

In addition, located parallel to this handle 5 underneath an operating handle 6 in the form of a lever handle 21, which can be used as the brake lever on a bicycle handle against the handle 5 and goes back to the starting position after releasing, and thus without releasing the handle. 5 can be operated by the same hand of the user.

Above the transverse plate 3a, a housing 3c of the receiving device 3 extends along the guide rods 11 upwards, from which above the handle 5 in the same direction transversely abstrebend a return switch 9 projects, thus by the thumb of the user's hand by pressing down, in Direction of the handle 5 can be operated, again without the user has to take his hand from the handle 5.

The actuating handle 6 acts on an approximately parallel below the transverse plate 3a arranged thrust arm 23, through which also extend the two guide rods 11a therethrough, the operation will be explained with reference to Figures 2 and 3 below.

Figure 1 a further shows - quasi as additional equipment - below the receiving device 3 along the guide rod 11 b displaceable and lockable and adjustable drilling depth stop 14a, which ends the movement of the receiving device 3 in the drilling direction 10.

Likewise, above the receiving device 3 on one of the two guide rods 11, a height stop 14b is arranged adjustable and lockable, which limits the return stroke of the receiving device 3, so that the foot plate 7 does not extend too far.

The two guide rods 11 a, b are connected to each other at its upper free end via a transverse bridge 15 and stabilized against each other and end with their lower ends in a base plate 7, the transverse to the device 10 in the region of the drilling axis a sufficiently large passage having.

• entweder (in den weitaus meisten Fällen) durch Einlegen eines - in Figur 3a dargestellten - Werkstückes zwischen die Oberseite 7b der Fußplatte 7 und dem Bohrer der Bohrmaschine mit der gewünschten Stelle unterhalb der Bohrachse, also dem Bohrer 12a der Handbohrmaschine 2, oder
• durch Aufsetzen und Fixieren der Fußplatte 7 mit ihrer Unterseite 7a auf der Oberfläche des Werkstückes, wie in Figur 1 b dargestellt.

Since the guide rods 11 are fixedly connected to the base plate 7, the drilling of a workpiece can be done in two ways:

• either (in the vast majority of cases) by inserting a - shown in Figure 3a - workpiece between the top 7b of the base plate 7 and the drill of the drill with the desired location below the drilling axis, ie the drill 12a of the hand drill 2, or
• by placing and fixing the base plate 7 with its underside 7a on the surface of the workpiece, as shown in Figure 1 b.

In both cases, the drill 2 is successively advanced by mostly multiple actuation of the operating handle 6 against the workpiece and the workpiece contacted by the tip of the drill and the hole made at right angles.

After reaching the desired depth or complete drilling of the workpiece, the pull-back switch 9 is actuated by pressing down, in the direction of the handle 5, whereupon the foot plate 7 automatically moves in the direction of drilling 10 with the guide rods 11, optionally until reaching the height stop 14b, the in Figure 1 b is not shown.

In contrast, Figure 1c shows that the drill stand 1 with its base plate 7 is not loosely placed on a workpiece, but is inserted from the side in a form-fitting manner in a corresponding recess of a larger base plate 12, so that e.g. the upper side 7b of the foot plate 7 is preferably aligned with the upper side of the base plate 12.

The base plate 12 may, for example, be screwed tightly on a workbench for drilling small workpieces that can be handled. By inserting the drill stand 1 in the fixed base plate 12 a stable stationary positioning of the drill stand 1 is achieved. By simply pushing it out sideways, on the other hand, the drill stand 1 is ready for mobile use, whereby not even the drill has to be removed from the drill stand in between.

In this context, Figures 4 show a slightly different design of the base plate 12 ', although the same form-fitting, preferably dovetail-shaped on the flanks shaped recess 16 for receiving the base plate 7, but in addition to the visible in Figure 4b bottom 12b a closed Circumferential recess in this bottom 12b, so an annular groove 13, for insertion of a protruding, flexible seal preferably recessed slightly from the outer edge has, which - not shown in the figures - via channels in the interior of the base plate 12 'with a vacuum port 17 is in communication which, for example, opens on the upper side 12a of the base plate 12 '.

By placing the otherwise smooth and flat bottom 12 b on a smooth workpiece surface and applying the vacuum port 17 with Underpressure, the base plate 12 'firmly and securely held on the workpiece, whereby an attachment to workpieces made of aluminum and precious metal is possible.

Thus, the setting of holes even further away from the edge of a workpiece is possible if the holding force with which the base plate is held on the workpiece is greater than the feed force which is applied by the drill stand against the workpiece.

The vacuum source is preferably an injector nozzle operated by means of compressed air, so that the desired negative pressure can be generated by means of any compressed air connection, in particular the compressed air networks usually available in commercial operations or a mobile compressor.

One of several possibilities for forming the feed device 4, which moves the receiving device 3 together with the hand drill 2 relative to the guide rods 11, is the step drive illustrated in FIGS. 3 a, b.

First, however, the principle of operation of a stepper drive will be explained:

Figure 2 shows a conventional stepper drive according to the prior art, as used for example in a cartridge holder for squeezing out the contents of the cartridge.

In this case, in the longitudinal direction 10 in the interior of the base part 2 ', mounted in the transverse walls push rod 4', which represents the clamping member, pushed forward, so pushed to the left in Figure 1, with the help of especially the push arm 23 ':

In the following, the terms "home position" and "operating state" are defined by the function of the stepper drive:

The push rod 4 'extends through a Schubarmöffnung 23 a of the push arm 23' therethrough, for which in a defined angular position, the starting position, the push arm 23 'sufficient clearance between the inner periphery of the Schubarmöffnung 23 a and the outer periphery of the push rod 4' is present, for easy pushing to allow the push rod.

From this initial position of the push arm 23 'with its one end in the pressing direction 12, ie in Figure 1 to the left, be pivoted (actuation state), wherein the extension direction of the Schubarmöffnung 23 a more and more deviates from the longitudinal direction 10 of the push rod 4' and on its outer circumference jammed and thereby the push rod 4 'in the pressing direction 12 entrains.

In general, the extension direction of the Schubarmöffnung 23a is exactly perpendicular to the plane of the push arm 23 ', and the starting position the exact right angle position of the push arm 23' to the longitudinal direction 10 or already slightly inclined to the operating end in the pressing direction.

The pivoting is effected by means of a hand operated by the user pivot lever 21 '(operating state), which is moved back together with the push arm 23' in the starting position after releasing, e.g. due to a push arm spring 26 'extending around the push rod 4, biasing the push arm 23' to the home position.

However, this retraction of the push arm would usually cause the push rod 4 'also moves back at least partially. To avoid this, the push rod 4 'extends through a likewise transverse support arm 24' through the Stützarmöffnung 24a through, in which - depending on the inclination of the support arm - also jamming is possible.

However, since the support arm 24 by a support arm 25 'in the direction of maximum inclination and thus tilting of the support arm 24' relative to the Push rod 4 'is biased (initial position), in the direction in which the push rod 4' would also move in backward movement, the push rod 4 'when releasing the clamping lever 21' does not move back through the support arm 24 '.

The push rod 4 'so only to the rear, in Figure 1 to the right, are withdrawn when the support arm 24' is actively pivoted against the force of the support arm 25 'in a position (actuation state) in which he is not on the push rod 'jammed by tilting and thus the push rod 4' can then be pulled out by hand to the rear (operating state). Also, a passage of the push rod 4 'through the push arm 23' is easily possible, since this is biased anyway by the spring in the starting position in which the displacement of the push rod 4 'against the pressing direction, ie in Fig. 1 to the right, is possible.

With such a stepper drive, however, neither a switching of the pressing direction 12 is possible, certainly not with the same hand.

FIG. 3 a shows-in a sectional representation along the drilling direction 10 through the guide rods 11 a, b -the implementation of this functional principle with some specializations as a feed device 4 in the drill stand 1 according to the invention.

The function can be better explained with reference to the enlarged view of Figure 3b of Figure 3a, in which further details are drawn.

First, however, it should be made clear that the function of the push rod 40 of Figure 2 in the drill stand 1 according to Figure 3 of the one, in Figure 3 left guide rod 11 b is met.

The other guide rod 11a serves only to prevent rotation of the feed device 4, so the carriage 3d, compared to the round Guide post 11 b, but this is also achieved by their non-circular cross-section.

In this case, the operating handle 6 serves as a clamping lever 21 for the stepper drive 20, the push arm 23 is arranged below the transverse plate 3a and also penetrated by both guide rods 11.

The transverse plate 3 a, which is one of the main components of the receiving device 3, is slidably guided with the carriage 3d along the two guide rods 11 a, b, with the help of inserted into the housing of the feed device 4 guide bushings 18 and can not jam against the guide rods 11 ,

The actuating handle 6 is mounted by means of a first transverse pin 6a in a between the guide rods and the handle 5 downwardly projecting extension 3 'of the transverse plate 3a, and engages with a second transverse pin 6b in a corresponding, open towards the end, recess in the operating end 23b of Push plate 23 a, so that this operating end 23b is also moved towards the handle when the operating handle 6 to the handle 5, whereby the operating handle 6 serves as a clamping lever 21 for this push arm 23.

The opposite bearing end 23c of this plate-shaped push arm 23 serves as a pivot axis which thus transverse to the drilling direction 10 and thus transversely to the plane in which the two guide rods 11 are located, by a Schubarmfeder 26 is arranged as a compression spring between the transverse plate 3a and the push arm 23 , and preferably formed as a spiral spring around the outer periphery of the guide rod 11 b around.

Since the bearing end 23 c is held by a screwed down from below screw 19 at the desired maximum distance to the transverse plate 3 a, in which the retaining screw 19 is screwed, the retaining spring 26 presses the underside of the push arm 23 against the head 19 a of the retaining screw 19, against the operating end 23b facing edge thus at rest as Swivel axis is used, however, lifts pressure on the actuating end 23b of this edge.

In the relaxed state of the clamping lever 21, the push arm 23 is thus in the deactivatable, the free displacement of the push arm 40 and thus the guide rod 11 b permitting, position.

If, however, the clamping lever 21 is actuated, the push arm 23 pivots in Figure 3b upwards, jammed on the guide rod 11 b and tries to push it upwards, which is not possible because of the fixed coupling with the guide rod 11 b. Instead, the entire receiving device 3 including the push arm 23 along the two guide rods 11 a, b moves down, ie in the drilling direction 10th

For this purpose, in the push arm 23, the second passage opening for passing the guide rod 11 a dimensioned so that they jammed in any position of the push arm against the guide rod 11 b.

A backward movement after release of the clamping lever 21 is prevented by the support arm 24, which is arranged in this case in the housing 3c above the handle 5 and protrudes transversely from this housing 3c.

The support arm 24 is biased as described by means of the support spring 25 in the activated position, wherein the support spring arranged as a spiral spring around the guide rod 11 b acting as a compression spring between the transverse plate 3a and the support arm 24 and is supported on these.

The bearing end 24c located in the housing 3c is mounted in the housing 3c in the region between the two guide rods 11a and b in a corresponding recess whose supporting edge 3e directed against the opposite actuating end 24b of the support arm 24 thus serves as a pivot axis for the support arm 24.

Pressing with the thumb on the top of the operating end 24b of the support arm 24 so on the pull-back switch 9, thereby overcomes the force of the support spring 25 so that the guide rod 11a can move freely through the support arm 24 passes, so drives - if there are no other charges - Then the entire recording device 3 against the drilling direction 10 relative to the guide rods 11 upwards, due to the bias of a compression spring 11 b1, which is arranged as a spiral spring around the outer periphery of the guide rod 11 a between the base plate 7 and the carriage 3d.

Thus, above all the following mobile use of the drill stand 1 according to the invention is possible:

If, for example, 20 mm diameter bores have to be set on a construction site several meters long steel part, each spaced a few centimeters from the outer edge, the operator proceeds as follows:

The recorded in the drill stand 1 drill holds the operator with one, usually the right, hand on her rear main handle, while holding with his left hand, the transversely projecting handle 5 of the drill stand 1, and possibly also with the same hand either the operating handle 6 zoom in as often as you like or press the pull-back switch 9 with your thumb.

In a position according to Figure 3a, he will insert the workpiece in the space between the drill 2a and base plate 7 and put the tip of the drill 2a to the desired position of the hole.

By single or multiple actuation of the clamping lever 21, the base plate 7 is used with its top 7b against the back of the workpiece, thereby aligned at right angles and as soon as this applies the drill 2a by turning on the drill 2 set in rotation, with simultaneous further feed against the Workpiece by the operating handle 6, so the Clamping lever 21, is pressed further, according to the Bohrfortschritt and the clamping of the workpiece material until the desired drilling depth is reached.

In this case, the operator can apply a feed force with the aid of the clamping lever 21, as he could hardly muster it alone by pressing the drill 2 against the workpiece, at least not with the same orientation of the drill.

After completion of the hole, the operator operates with his thumb the pull-back switch 9, whereupon the foot plate 7 and the receiving device 3 move apart and you can withdraw the drill 2 from the hole and can be started with the setting of the next hole.

If the bore to be produced is further away from the outer edge of the workpiece than the distance between the drill 2a and the nearest guide rod 11b, the foot plate 7 is placed with its underside 7a on the outside of the workpiece, either directly or by means of an intermediate therebetween arranged base plate 12, which can also be prefixed on the workpiece, for example. By magnetic force, negative pressure, screw or jamming.

In contrast, Figures 5a and 5b are enlarged detail views of another solution of a stepper drive for the drill stand and differ only by the pressing direction shown by the position of the switch 22 12a / b, along the longitudinal direction 10 ', which may be the drilling direction 10, but does not have to be down in Figure 5a and in Figure 5b is directed upwards. In the following, Fig. 5a will be described.

The switchability of the pressing direction 12 is effected by a in this case in the longitudinal direction 10 'displaceable switch 22, the handle portion 22d protrudes from a slot of the base part 2 and be grasped and adjusted can, and is connected to a support member 22 e, which is guided in the interior of the base part 2 in the longitudinal direction 10 'slidably.

The bearing end 23 c of the push arm 23 is located on the same side of the push rod 40 as the support member 22 e of the switch 22, and is connected thereto via a tension spring 27 a, which is firmly attached to a corresponding pin on the bearing end 23 c, which - in addition to the lateral Guide through the shells of the base part 2 and the carriage 3d of the receiving device 3 - represents the storage of the push arm 23. The pivot point of the push arm 23 is thus adjustable by means of the switch 22 from top to bottom corresponding to the end positions 22a, b of the switch 22 in the base part second

Since the actuating end 23b of the push arm 23 engages not on an outer contour, but on an inner contour 21 'of the clamping lever 21, which is designed approximately triangular, sitting on the actuating end 23b roller 31 in the end positions of the switch 22 with either one of the active edges 21a , b of this inner contour 21 'are in contact, which are designed so that upon actuation of the clamping lever 21, this active surface, the push arm 23 from the deactivated position in which the Schubarmöffnung 23 a loosely surrounding the push rod 40, is pivoted so that the push rod increasingly inclined in the Schubarmöffnung 23a and jammed with the side surface and is taken from this in the pressing direction 12.

In these end positions, a manual forward sliding of the push rod 4 in the pressing direction 12 is also possible, but not contrary to the pressing direction 12, because this is indeed prevented by the support arm 24:

Also, the support arm 24 is connected at its, the switch 22 adjacent end by turn a tension / compression spring 27b with the handle portion 22d of the switch 22 and is thus also in its inclination from one side to the other side with respect to. To the longitudinal direction 10th 'perpendicular transverse direction 11 converted, so that in each case a movement of the push rod 4 is prevented against the pressing direction.

For this purpose, the pivot axis of the support arm 24 is located on the side facing away from the switch 22 and is formed in this case by receiving the bearing end 24 c of the support arm 24 between two prism-shaped projections of the base part 2.

The bearing ends 23c, 24c of the two arms are thus on opposite sides with respect to the push rod 4, as well as the two actuating ends 23b, 24b, wherein the actuating end 23b of the push arm 23 on the side of the clamping lever 21 and the actuating end 24b of the support arm 24th on the side of the switch 22 and thus lies on the side facing away from the clamping lever 21 side.

In addition, in the center position 22c of the switch 22 and the support arm 23 in a deactivated position, so that in this middle position of the switch 22 of the push arm 23 is freely displaceable in both directions to the base part 2.

Accordingly, in Figure 5a, the roller 31 is in contact with the upper active surface 21 a and thus also the switch 22 at the upper end position 22 a as well as the operating end 24 b of the support arm 24th

In which the user holds the pistol grip-like lower part of the base part 2 in his hand while using his fingers the tensioning lever 21 on the base part 2, the operating end 23 b is displaced by means of the active surface 21 a down and in the Schubarmöffnung 23 a push rod 4 first jammed and with further clamping movement of the push arm 23 in the pressing direction 12a, so down, taken.

After releasing the clamping lever 21 this is withdrawn by the lever spring 30 in the starting position (as shown in FIG. 5a shows) and the push arm 23 acted upon by the tension compression spring 27a and thereby also pivoted back into the starting position.

In FIGS. 5b, the changeover switch 22 is in its lower end position 22b and accordingly also the operating end 24b of the support arm 24 and also the bearing end 23c of the push arm 23 is reached upwards by a pressing direction 12b. FIG. 5b1 shows the situation with the tensioning lever 21 relaxed, FIG. 5b2 with the position used on the base part 2.

The figures 5 further show that the pivotable clamping lever 21 is not mounted directly in the base part 2, but via a bearing pin 28 in a self-moving, namely pivotable, bearing arm 29, which is preferably twice in the figures 5 not only behind but also in front of the Push rod 40 extending transversely.

The storage end 29 c is located on the side facing away from the switch 22, while the operating end 29 b is located on the side of the switch 22 and is connected to the operating end 24 b of the support arm 24.

This causes when switching the switch 22 from one to the other end position 22a to 22b not only the support arm 24 is changed in its pivotal position with respect to the transverse direction 11, but also the inclination of the bearing arm 29 is adjusted by analogy.

By arranging the bearing pin 28 between the bearing end 29c and the actuating end 29b, a pivoting force is exerted on the bearing arm 29 when the tensioning lever 21 is actuated by the bearing pin 28, which acts in each pivoting direction that the supporting arm 24 fixedly connected to the bearing arm 29 at the operating end is biased into the blocking, activated pivot position.

The effect of the support arm 24 biasing in this activated position tension / compression spring 27b is thus massively reinforced by the pivot arm 29, so that a much stronger clamping action of the support arm 24 can be achieved, as could be achieved only by the spring 27b.

Again, this in turn affects both possible pressing directions 12a, b, depending on the position of the switch 22nd

The base part 2 of the carriages 3d consists of two mutually opposed half shells, with corresponding recesses on the mutually facing contact surfaces to receive the aforementioned movable parts and to leave a passage for the push rod 40 free.

The described movements all run in the same plane, namely the drawing plane of FIGS. 5, that is to say the contact surface of the two mirror-symmetrical half-shells 2 a, b of the base part 2.

Figures 7 each show other drives, but all three representations have in common that there is a workpiece 40 in the drill stand 1, namely between the top 2a, which by means of an auxiliary device, such as the illustrated clamping claw 39, workpiece 40 and base plate 7 fixed pressed against each other and thereby relatively fixed against each other. The clamping claw 39 is also mounted on the top of the base plate 7, on the shoulder of the workpiece area.

Otherwise, FIGS. 6 and 7 differ by the type of drive of the feed device 4, while all other components are identical to the illustrations in FIGS. 3 and 4:

FIG. 6 shows a drive solution by means of a ratchet 38, as used today in conventional socket sets:

From ratchet head 38a extends a handle 5 'in a longitudinal extent at right angles to the ratchet axis 37, on which on a commercial ratchet 38 is a square for placing the desired screw.

In the present case, the ratchet 38 is preferably captive on the carriage 3d, in which the feed device 4 is housed, with the ratchet axis 37 preferably perpendicular to the longitudinal direction 10 and drives in the feed device, for example, a - not shown - on the same axis rotating pinion, which meshes with a arranged along the longitudinal direction 10 of the guide rods 11 rack.

The handle 5 'is thus in this case simultaneously actuating handle 6, because by the up and down movement of the operating handle to the ratchet axis 37, the feed device is driven stepwise.

Figures 7a, b show the stepper drive alternative drives that are not, in which, however, also the handle 5 "simultaneously actuating handle 6:

In the same orientation as the ratchet axis 37, that is preferably perpendicular to the longitudinal direction 10 of the guide rod 11, in the drive of Figure 7a extends a bevel gear axis 36 'on which a bevel gear is rotatably mounted on the carriage 3d. With the bevel gear 36 pinches a bevel pinion 35, which is rotatably connected to the handle 5 ", thereby actuating handle 6, which is rotatably supported about its longitudinal axis 5 also on the carriage 3d.

By forward rotation - and in between encompass with the holding hand - for 5 "or 6 bevel pinion 35, bevel gear 36 and thus connected to the bevel gear 36, which is clamped with the rack, not shown, along the guide rod 11, driven, and As a result, the carriage 3d moves in the longitudinal direction 10 relative to the guide rods 11a, b, that is to say the rest of the drill stand The direction of movement depends on the direction of rotation of the handle 5 "or 6.

7b offers the same function, but here on the grip 5 "or 6, which is likewise rotatable about its longitudinal axis 5a, a toothed worm 34 is arranged instead of and with the orientation of the bevel pinion 35. The worm 34 clamps with a worm wheel 33, which with its Rotation axis preferably parallel to the longitudinal direction 10, namely preferably concentric with a guide rod 11 a, arranged in the carriage 3d is effected in the drive means of the handle 5 "and 6 also a relative displacement 3d in the longitudinal direction 10 along the guide rods 11.

This can be achieved by means of the external gear teeth of the worm wheel 33 in a correspondingly helical rack extending in the longitudinal direction, or by engagement of an internal toothing of the worm wheel 33, a threaded spindle, which is located on the outer circumference of the corresponding guide rod.

LIST OF REFERENCE NUMBERS

1

drill

2

hand drill

3

cradle

3a

transverse plate

3b

mounting eye

3c

casing

3d

carriage

3e

supporting edge

4

feeder

5

handle

6

operating handle

7

footplate

7a

bottom

7b

top

8th

retraction device

9

retreat switch

10

drilling direction

11

guide rod

11 a1

compression spring

12

baseplate

13

ring groove

14a

depth stop

14b

height stop

15

bridge

16

recess

17

Vacuum connection

18

guide bush

19

retention screw

19a

head

20

step drive

21

tensioning drive

21 '

inner contour

21 a / b

active edge

22

switch

22a / b

end position

22c

center position

23

push arm

23a

Schubarmöffnung

23b

actuating end

23c

storage end

24

support arm

24a

Stützarmöffnung

25

support spring

26

Schubarmfeder

27a

Tension / compression spring

28

bearing bolt

29

bearing arm

30

Hebeifeder

33

worm

34

slug

35

bevel pinion

36

bevel gear

37

ratchet axis

38

ratchet

39

clamping shoe

40

workpiece

Claims (14)

Drill stand for holding and pushing forward a hand drill (2) in the drilling direction (10) with - A receiving device (3) for the drill (2), - a feed device (4) for advancing the drill (2) relative to at least one guide rod (11), characterized in that
the drill stand (1) has a handle (5) protruding transversely, in particular at right angles, from the drilling direction (10) and an actuating handle (6) for actuating the feed device. Drill stand according to one of the preceding claims,
characterized in that - The handle (5) and / or the actuating handle (6) on the receiving device (3) is arranged, and / or in particular - The operating handle (6) is arranged so that it can be operated by the user with the same hand with which he holds the handle (5) and without having to let go, and / or in particular - The handle (5) and operating handle (6) are functionally unified in a handle. Drill stand according to one of the preceding claims,
characterized in that - The drill stand (1) comprises a retraction device (8) for rapid retraction of the feed device (4) relative to the base plate (7) against the drilling direction (10), and / or in particular - The retraction device (8) after actuation of a withdrawal switch (9) performs the withdrawal itself, and / or in particular - The pull-back switch (9) on the drill stand (1), in particular on the receiving device (3) is arranged so that it can be operated by that hand of the user holding the handle (5), in particular by means of the thumb, without having to let go of the handle (5). Drill stand according to one of the preceding claims,
characterized in that - The handle (5) for the function as an actuating handle (6) can be moved, in particular about its longitudinal axis can be rotated, or about a pivot axis transversely to its direction can be moved back and forth, and / or in particular - The rotatable for the actuation function handle (5) during forward rotation via a gear, in particular a gear transmission, or a self-locking worm gear, the receiving device (3) relative to the guide rod (11) moves by means of a guide rod extending along the rack the transmission is engaged, and / or in particular - The handle (5) for the reverse direction of rotation has a freewheel.
(CONCRETE DESIGN) Drill stand for holding and pushing forward a hand drill (2) in the drilling direction (10) with - A receiving device (3) for the drill (2), - a feed device (4) for advancing the drill (2) to at least one guide rod (11), characterized in that
the feed device (4) comprises a manual drive, in particular a step drive (20). Drill stand according to one of the preceding claims,
characterized in that - The actuating handle (6) is a back and forth pivotable clamping lever (21), and / or in particular - The drill stand (1) comprises a base plate (12), in particular for fixed screwing on a workbench, etc., in which the base plate (7) in and against the drilling direction (10) held positively locked, in particular transversely to the drilling direction (10) laterally insertable, is, and / or in particular - The base plate (7) and / or the base plate (12) has on its underside a recess which is connectable to a vacuum port, surrounded by a protruding ring seal, and / or in particular - As vacuum source a Druckluftinjektor is used, which is fed in particular by a compressed air network with compressed air.
(STEP DRIVE) Stepper drive (20), in particular for use in a drill stand (1) according to one of the preceding claims, with - One of the push rod (4) penetrated, relative to the push rod (4) by means of the clamping lever (21) pivotable, transverse standing thrust arm (23) and - One of the push rod (4) penetrated, transverse to this support arm (20) which is pivotable and / or displaceable relative to the push rod (4), - Wherein Schubarmöffnung (23 a) are dimensioned so that they can be run through loosely in the starting position of the push rod (4) and in the opposite pivoted operating state of the inner periphery of the opening (23 a) against the outer periphery of the push rod (4) jammed. Step drive according to one of the preceding claims,
characterized in that - The support arm (24) by means of a support spring (25) is biased in the starting position in the direction in which the push rod (4) in attempted displacement against the pressing direction (12) in the support arm (24) tilted and jammed, and / or in particular - The thrust arm (23) by means of the clamping lever (21) can be pivoted from the initial position into the operating state with entrainment of the push rod (4) in the clamping direction, and / or in particular - The push arm (23) is biased by a Schubarmfeder (26) in the starting position. Step drive according to one of the preceding claims,
characterized in that - The guide rod (11 a) is one of two parallel guided in a distance guide rods (11 a, b) with a round outer cross-section, and / or in particular - The guide rod (11 a) having a non-circular outer cross-section, and / or in particular - The handle (5) between the push arm (23) and support arm (24) is arranged and the push arm (23) in the drilling direction (10) further forward than the handle (5) and the clamping lever (21) in the grip area with respect Grab handle (5) is arranged, and / or in particular - The support arm (24) in the drilling direction (10) far behind the handle (5) is arranged so that it can be operated at the operating end with the thumb of the hand holding the handle (5). Step drive according to one of the preceding claims,
characterized in that - The holding force of the support arm (24) is selected so that it can be overcome with the force of a thumb of the user, and / or in particular - The pivoting direction (from the initial position in the operating state) of the push arm (23) from clockwise to counterclockwise and vice versa for the purpose of switching the effective direction can be adjusted, in particular by displaceability of the push arm (23), in particular when it is in its initial position, in particular in the longitudinal direction (10), so that its actuating end (23b) with another area, in particular another active edge (23). 21 a / b) of the clamping lever (21), in contact, and / or in particular - The displacement of the push arm (23) at least also a pivoting of the push arm (23) relative to the push rod (4), in particular from one to the other side of the transverse direction (11). Step drive according to one of the preceding claims,
characterized in that - The the actuating end (23b) opposite, on the other side of Schubarmöffnung (25) lying, support end (23c) of the push arm (23) is displaceable in the longitudinal direction, in particular by means of the switch (22) in the longitudinal direction (10) displaceable and in particular lockable is, and / or in particular - The support end (23c) of the push arm (23) in particular by means of a combined tension / compression spring (27a) opposite the switch (2) in the activating direction of the push arm (23) is biased, and / or in particular - The clamping lever (21) by means of a Schubarmfeder (26) biases the push arm and clamping lever together in the deactivated position, and / or in particular - That the active edges (21 a / b) of the clamping lever (21) are contoured differently and thereby the force applied to the clamping lever (21) force in particular different degrees of force on the push arm (23) is translated. Step drive according to one of the preceding claims,
characterized in that - The support arm (24) is pivotable, in particular by means of the switch (22) is pivotable, between two bez. the transverse direction (11) opposite inclined positions, and / or in particular - The support arm (24) in each case in the direction of increasing inclination to the transverse direction (11) is biased by spring force, in particular by means of a single combined tension / compression spring (27b), in particular between the switch (22) and the one end of the support arm ( 24), and / or in particular - The clamping lever (21) about a bearing pin (28) is pivotable, the displaceable, in particular in the longitudinal direction (10), relative to the base part (2) is displaceable, and / or in particular - The bearing pin (28) is received in a bearing arm (29) which is received transversely to the push rod (4) pivotable in the base part (2) and in particular by means of the switch (22) is pivotable, and / or in particular - The means of the switch (22) selectable center position (22c) of the push arm (26) relative to the clamping lever (21) both push arm (23) and support arm (24) holds in the deactivated position.
(OPERATION WAY) Method for producing holes in particular large workpieces with a large applied pressing force in the drilling direction by means of a hand drill,
characterized in that - The hand drill (2) is inserted into the receiving device (3) of the drill stand (1) and fixed there, the drill stand (1) with its foot plate (7) is preferably arranged on the rear side on the workpiece, - and then the drill bit is positioned at the target point, - Wherein one hand of the user holds the pistol grip of the hand drill (2) and holds the other hand of the user the transverse to the drilling direction (10) protruding handle (5) of the drill stand (1), and - The other hand with simultaneous operation of the operating handle (6), the receiving device (3) along with the hand drill (2) against the workpiece in the drilling direction (10) moves forward and produces the bore after reaching the workpiece surface, to the desired depth under continuous operation the operating handle (6), - After completion of the operation of the operating handle (6) the other hand without releasing the handle (5) the pull-back switch (9) of the drill stand (1) operated and after the resulting driving away the base plate (7) of the receiving device (3) and the drill (2) withdraw the drill from the manufactured wellbore and - The now released drill stand (1) is removed from the workpiece. Method according to one of the preceding method claims,
characterized in that - Prior to immersion of the drill in the workpiece, the other hand of the user actuates the operating handle (6), in particular against the drilling direction pulls, taking the foot plate (7) to the workpiece, and / or in particular - The application of the base plate (7) with the bottom (7a) takes place on the surface of the workpiece and holding the handle (5) holding hand in the drilling direction (10) presses against the handle (5), and / or in particular - After placing the foot plate (7) with its underside (7a) on the top of the workpiece and before the drilling process, the foot plate (7) is firmly connected to the workpiece, in particular so firmly that the necessary release force is greater than that by the user by means of the drill stand (1) applied pressing force against the workpiece.

Images