EP1013380A2 - Handheld power driven screwdriver - Google Patents

Abstract

An electric power tool (1) is adapted to drive screws by having a driving bit in the chuck within a hollow extension (3) removably fitted (5) to the tool housing (2) and having an axially adjustable end (8). The side wall has a slot (6) with an enlargement (7) at the remote end.

Description

The invention relates to a handheld screwdriver according to the preamble of Claim 1.

Gypsum plasterboard, chipboard or fiberboard are hand-guided Screwdrivers and suitable fastening screws often directly - without Pre-drilling - on a substructure, for example a wooden structure, one Profile sheet or the like, attached. It must be from the plasterboard concealed substructure to be hit by the mounting screw to move according to regulations. If the substructure is missed, the rule is the fastening screw very far over the surface of the plasterboard or the like. These mounting screws that have not been moved must be replaced be removed. To do this, the user of the screwdriver must always have one Carry gripping pliers or the like with you after you put the Screwdriver captures the protruding screw end and this from the Plasterboard can be pulled out. Aside from the need for Carrying a gripper or the like leads to the storage of the screwdriver an interruption in the workflow. In addition, for example when working on a Ladder or on a scaffold, safe storage of the screwdriver can be problematic.

The screwdriver bits of hand-held screwdrivers are in professional use exposed to heavy wear and therefore have to be changed relatively frequently become. To remove the screwdriver bit from the tool holder of the Bit holder, the user needs a gripping tool, For example, pliers with which the screwdriver bit is gripped and out of the bit holder can be pulled out. It may also be necessary to use the bit holder itself exchange. To do this, the user usually has to use a separate one Use auxiliary tool. He must either constantly carry the auxiliary tool with him lead, or he has to get it if necessary, which leads to undesirable Breaks.

Hand-held screwdrivers are usually equipped with a depth stop, which is a controlled screwing in and, for example, in the case of the weather exposed attachment points, a controlled pressing on the Fastening screw provided sealing disc allows. With the known The user has no possibility of depth stops during the setting process determine whether and when the sealing washer touches the component and if necessary is spanned by the screwing process. As a result, the quality is not consistently good the fastenings guaranteed. The sealing disk is pressed on in an uncontrolled manner and can be exposed to the weather in an inadequate seal Fixing points result. By spanning the on the Fastening screw provided sealing washer, the rubber coating on the side be squeezed out. As a result, the aesthetics of the attachment point are lost, which can lead to complaints from the client. For all of these reasons, The majority of the fasteners do not use the depth stop. However, this can lead to uneven and inadequate screw connections. The Not using the depth stop requires even greater care the creation of the attachment point in advance, by which the time required for this is extended.

The object of the present invention is to overcome these disadvantages of the prior art remedy. A generic, hand-held screwdriver should do this be improved that on carrying a separate auxiliary tool, such as for example, a gripper or the like, not correct for the removal offset fastening screws made of plasterboard and the like are dispensed with can be. The conditions should also be created for the Changing the screwdriver bit and, if necessary, the bit holder without additional Aid tools can go. When creating tightness-relevant Attachment points should no longer exist for the user on which Refrain from using the depth stop.

The solution to these tasks is a hand-held screwdriver with the im characterizing section of claim 1. Beneficial Further developments of the screwdriver are the subject of the dependent Claims. The hand-held screwdriver created by the invention comprises a drive arranged within a device housing for one around it Axis rotatable spindle with an axially protruding from the device housing Tool holder for a processing tool is connected. One regarding his axial overhang beyond the tool holder adjustable depth stop surrounds the Tool holder sleeve-shaped and is preferably detachable with the device housing, connectable. At least one axially extending is in the wall of the depth stop Recess formed, which completely the wall of the depth stop penetrates and at its end area facing away from the device housing one in the axial Towards the open insertion area.

The at least one axial recess on the depth stop serves as an extraction aid, especially for fastening screws. Thus, the user needs to remove it an incorrectly offset fastening screw no longer has a separate gripper. Rather, the fastening screw can be pulled out with the screwing device itself become. For this purpose, the surface of the component, for example one Plasterboard, protruding screw head through the open insertion area into the axially extending recess formed in the wall of the depth stop Removal aid introduced. The fastening screw gripped by the pull-out aid can then be done by moving the screwdriver away from the component surface be pulled out. The user does not have to carry a separate one Auxiliary tool, such as a gripper. To pull out the incomplete the screwdriver no longer has to be put down become. With a suitable design of the recess, the pull-out aid can also be used for Pulling out a screwdriver bit from the bit holder. This will the depth stop has been released from the device housing. Then the screwdriver bit in the Recess in the depth stop can be clamped in and pulled out. The same applies also for the removal of the bit holder. The at least one recess penetrates the Wall of the depth stop completely. This enables the user to Use the recess to check whether and when a screw is located on the screw Sealing disc attaches to the component. There is therefore no need for the user more to carry out the screwing process without depth stop.

It turns out to make it easier to insert the fastening screw to be pulled out of advantage if the recess has the shape of a slot guide and on her the end area facing away from the device housing a ramp-like insertion area having. The head of the fastening screw is above the ramp-like insertion area easy to thread into the slot guide.

In an advantageous variant of the invention, the recess has its open one End area has a smaller slot width than at the axially opposite, closed end area. This constructive measure can Fixing screw, a screwdriver bit or a bit holder simply by clamping be held to the part from a plate, from the bit holder or from the Pull out the tool holder.

By providing more than one recess along the circumference of the depth stop the recesses can also be formed with different geometries. This allows the straight for different types of mounting screws suitable pulling aid can be used. The arrangement of several recesses along the circumference of the depth stop have the advantage that the the most appropriate position of the screwdriver selected for the respective spatial requirements can reach behind the head of the mounting screw and pull it out can.

It proves to be advantageous for the handheld screwdriver according to the invention, if at least one additional, axially extending, slot-shaped recess is provided which the wall of the depth stop fully interspersed and has dimensions that of the at least one Recess are different. In this advantageous embodiment, the at least one, additional recess especially for pulling out the Screwdriver bits or the bit holder are formed.

The at least one additional recess advantageously has a keyhole-like one Form, which has a circularly expanded area, which is in an axial Passes towards the tapered section. In the tapered slot the screwdriver bit can be clamped in order to pull it out of the bit holder. The Circularly expanded area is used to remove the tool holder in the Screwdriver inserted bit holder.

By having the at least one recess or the at least one recess on one side is open and opens at the free front end of the depth stop, the Users have a clear view of the screw during the screwing process. Thereby he can also determine if and when a depth stop is attached to the Screw the sealing washer placed on the component. For the user So there is no longer any reason to carry out the screwing process without a depth stop. Thus, the requirements for the actual depth stop function are met tightness-relevant fastening points, a controlled pressing of the sealing washer, created. In the case of several, for example 3 to 4, distributed over the circumference Recesses or recesses that point towards the free front end of the depth stop are open, corner access is also significantly improved.

In a variant of the invention, the at least one recess and the at least one a recess arranged one behind the other in the axial direction, the particular as a pull-out aid for screws serving recess is closer to the device housing than the at least one recess. This arrangement of the recess (es) and the Recess (es) is particularly useful for a depth stop that is one front sleeve and a rear threaded bushing that axially one behind the other arranged and releasably connected to each other via an adjustable screw connection are. The at least one recess on the device housing is non-rotatable and releasably connectable rear threaded bushing and the at least one Recess arranged on the front sleeve.

Fig. 1

eine Gesamtansicht eines Schraubgeräts mit einem erfindungsgemässen Tiefenanschlag;

Fig. 2

eine perspektivische Darstellung eines gegenüber Fig. 1 modifizierten Tiefenanschlags;

Fig. 3 und 4

eine Darstellung der Einzelbestandteile einer Variante eines zweiteiligen Tiefenanschlags; und

Fig. 5

eine weitere Ausführungsvariante eines Tiefenanschlags.

The invention is explained in more detail below with all the details that are essential to it, using exemplary embodiments illustrated in the drawings. They show in a partly schematic representation:

Fig. 1

an overall view of a screwdriver with a depth stop according to the invention;

Fig. 2

a perspective view of a modified depth stop compared to Figure 1;

3 and 4

a representation of the individual components of a variant of a two-part depth stop; and

Fig. 5

another variant of a depth stop.

The hand-held screwdriver shown in Fig. 1 is overall with the Reference number 1 provided. It comprises a pistol-like device housing 2 with a handle on which an operating switch is arranged. The Power is supplied via an electrical connection cable. Within the Device housing 2 is a drive motor, not shown, for one around her Longitudinal axis A rotatable rotating spindle arranged. In axial extension of the rotating spindle protrudes a tool holder from the device housing 2, the receiving a Processing tool, especially a bit holder for screwdriver bits is used. So far corresponds to the screwing device 1 well known from the prior art Handheld devices.

The tool holder is covered in Fig. 1 by a depth stop 3, the For example, is formed in two parts and a rear threaded bush 4 and one includes front sleeve 8. The rear threaded bush 4 is with her Connection area 5 connected to the device housing 2. The preferably detachable Connection can be a screw connection, a bayonet connection or the like his. The front sleeve 8 is in the threaded bushing 4 via an external thread 9 screwed in. The total length of the depth stop 3 is more or less screw the front sleeve 8 into the threaded bushing 4 as required adjustable. The function of the depth stop 3 is from the prior art well known and will not be explained in more detail here.

At its end section opposite the connection area 5 is in the wall the threaded bushing 4 is provided with a recess 6. The recess 6 extends essentially in the direction of the axis A and penetrates the wall of the Threaded bushing 4 completely. At its end area facing away from the device housing 2 the recess 6 has an approximately teardrop-shaped insertion area 7, for example for a screw head.

Fig. 2 shows a variant of a two-part depth stop 10, the rear Threaded bushing 4 corresponds to the rear threaded bushing from FIG. 1. The Connection area of the threaded socket 4 to the device housing is in turn with the Reference number 5 provided. The recess in the wall of the threaded bush 4 carries the reference numeral 6. The drop-shaped extended insertion area is designated by 7. From the illustration it can be seen that the recess 6 with the drop-shaped extended insertion area 7 a type of slot guide for an inserted Screw head forms. When inserted, the screw head is removed from the Grip behind the longitudinal edges of the slot guide. The via an external thread 12 in the Threaded socket 4 screw-in front sleeve bears the reference number 11. In the Wall of the front sleeve 11 are several, extending in the axial direction Recesses 13 are provided, which are distributed over the circumference of the front sleeve 11. The recesses 13 have an approximately circular widened area 14 on the a conically tapered section 15 connects. For reasons of space, one turns out Orientation according to the illustration as expedient, in which the circular expansion Area 14 is provided in the rear part of the sleeve and the tapered Section 15 extends in the direction of the free front end of the sleeve 11.

3 and 4 is a modified two-part depth stop in its individual parts shown and provided overall with the reference number 16. The back one Threaded bushing 17 in turn has a connection area 19 for the creation of a detachable connection to the device housing. At its opposite end area an internal thread 18 is indicated. A recess 20 has an approximately U-shaped Shape. The recess 20 open towards the front end has a ramp-like shape Insertion area 21 equipped, which facilitates the insertion of a screw head. The Front sleeve 11 shown in axial section in FIG. 4 corresponds to the front sleeve of the Depth stop shown in Fig. 2. It is with an external thread 12 for the Screw connection equipped with the internal thread 18 of the threaded bushing 17. The with 13 designated, keyhole-like recesses are uniform distributed over the circumference of the front sleeve 11. Each of the recesses 13 has an approximately circular widened area 14 to which a conically tapering Section 15 connects, which in the direction of the free front end of the sleeve 11th extends. The tapered sections are used to clamp one Screwdriver bits, which is very easy in this way with the one from the device housing removed depth stop 16 can be pulled out of a bit holder. The circular Extended area 14 serves as a pull-out aid for the bit holder on the tool holder.

Fig. 5 shows a further variant of a depth stop, the whole with the Reference numeral 22 is provided. This depth stop 22, the one or more parts can be formed, for example, has three recesses 24 which form the wall of the depth stop 22 completely. The recesses 24 are one-sided open and open at the free front end of the depth stop. The open ones Mouths of the recesses form lead-in areas 25. The recesses 24 can be tapered in the axial direction. On the axially opposite At the end of the depth stop 22, a connection area 23 is provided, which preferably detachable connection of the depth stop 22 to the device housing serves.

Claims (10)

Hand-held screwdriver with a drive arranged inside a device housing (2) for a spindle rotatable about its axis (A), which is connected to a tool holder for a machining tool that projects axially from the device housing (2), and with one with regard to its axial protrusion over the Tool holder adjustable depth stop (3; 10; 16; 22) which surrounds the tool holder in a sleeve shape and can be connected to the device housing (2), preferably detachably, characterized in that in the wall of the depth stop (3; 10; 16; 22) At least one axially extending recess (6; 20; 24) is formed which completely penetrates the wall of the depth stop (3; 10; 16; 22) and has an insertion area (7; open in the axial direction) at its end area facing away from the device housing (2). 21; 25). Hand-held screwing device according to claim 1, characterized in that the recess (6; 20) has the shape of a slot guide and the End area facing away from the device housing (2) has a ramp-like insertion area (7; 21). Hand-held screwdriver according to claim 1 or 2, characterized in that the at least one recess (6) has one at its one axial end region has a larger width than at the opposite end area. Hand-held screwdriver according to one of the preceding claims, characterized in that along the circumference of the depth stop (10; 16) several cutouts (6; 20) are provided. Hand-held screwing device according to claim 4, characterized in that on Depth stop (10; 16) at least one further, axially extending, slot-shaped Recess (13) is provided which the wall of the removable Depth stop (10; 16) completely penetrated and has dimensions that are different from the at least one recess (6; 20). Hand-held screwing device according to claim 5, characterized in that the Recess (13) has a keyhole-like shape and a circular has an enlarged area (14) which is conical in the axial direction tapering section (15) passes. Hand-held screwdriver according to claim 3 or 5 or 6, characterized characterized in that the recess (24) or the recess on its one End region is open in the axial direction and at the free front end of the Depth stop (22) opens. Hand-held screwdriver according to one of claims 5 to 7, characterized characterized in that along the circumference of the depth stop (10; 16) several identical recesses (13) are provided. Hand-held screwing device according to claim 8, characterized in that the at least one recess (6; 20) and the at least one recess (13) in are arranged one behind the other in the axial direction, the recess (6; 20) is closer to the device housing (2) than the at least one recess (13). Hand-held screwing device according to claim 9, characterized in that the Depth stop (10; 16) a front sleeve (11) and a rear threaded bush (4; 17) which is arranged axially one behind the other and adjustable Screw connection (12, 18) are detachably connected to one another, the at least one recess (6; 20) on the with the device housing (2) rotatably and releasably connectable rear threaded bushing (4; 17) and the at least one recess (13) is arranged on the front sleeve (11).

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