DE29705480U1 - Device for processing magazine screws - Google Patents

Description

My file: F 67/22 bt

Device for processing collated screws

The invention relates to a screwing device with a handle and with a screwdriver head in which a screwing tool is arranged so that it can be moved axially against a return spring, with a screw receiving chamber, with spring-loaded clamping jaws, a head stop for centering a screw and an adjustment slide arranged laterally thereto and displaceable perpendicular to the screwdriver axis with a stop device.

DE-AS 24 52 246 describes a screwing device with an automatic screw transport and a relatively large storage container for magazine strips. The disadvantage is that the device is technically complicated. Dirt or deformation of the magazine strip can cause the strip feed to jam. Another disadvantage is the relatively large storage container for the magazine strips. Due to the weight caused by this, easy work is not possible.

Furthermore, DE 34 48 511 C2 discloses a magazine rail for magazine strips, which has a short, compact structure. This rail is mounted perpendicular to the screwdriver axis. An extension of the magazine strip and thus of the entire magazine leads to an increase in weight and, due to the right-angled arrangement of the magazine, to a restricted

and difficult work. In such rails, rigid magazine strips are required.

Furthermore, simple flat magazine strips are known from DE-GM 75 21 374, which are used for screwing devices.

It is the object of the present invention to improve the screwdriver mentioned at the beginning so that it can be used to process the simple flat magazine strips without any problem, it can accommodate a large number of screws, is easy to handle and is simple in construction and not susceptible to failure.

The task is solved in that a magazine rail for guiding a flexible magazine strip with screws inserted into it is led out to the side of the screw receiving chamber and extends in an arc parallel to the screwdriver axis and that opposite the magazine rail on the screw receiving chamber there is a passage opening for the emptied area of the magazine strip.

Advantageous embodiments of the invention are shown in the subclaims.

It is advantageous that the screwdriver head according to the invention can be screwed onto commercially available screwdrivers, such as electric screwdrivers, pneumatic screwdrivers or revolver screwdrivers, if a suitable connection is provided

Another advantage is that the magazine rail, which is mounted in an arc and then extends parallel to the screwdriver axis, can hold up to 100 screws without taking up much space and without having to work with the screwdriver

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to limit. Once the device is in the screwing position, the screw can be moved into position manually, either by pushing on the protruding screw ends or by pulling on the free end of the magazine strip. By dispensing with automatic screw transport, complicated technology and thus susceptibility to failure are avoided.

Another advantage is that the gap between the clamping jaws is arranged perpendicular to a processing line, which is created by an alignment line on which the screws are screwed in. This ensures that even if the clamping jaws are dirty, the processing line, i.e. the alignment line of several screws inserted next to each other in a profile, does not go out of alignment. With this arrangement of the clamping jaws, the screw only moves along the fastening line, which has no influence on the setting accuracy.

A further advantage is provided by a swivel head joint attached to the screwdriver axis. This makes it possible to place the screws as close to the edges as possible, especially when screwing in corners and edges (e.g. when building windows).

It is also advantageous that a screw receiving chamber has a passage opening for the emptied magazine strip, through which the magazine strip can be pushed or pulled.

A further advantage is a head stop formed by an interchangeable semi-cylindrical hollow insert, each of which is provided with an inner diameter such that it centers screws of a corresponding head diameter and thus allows them to be processed.

It is advantageous to use flexible, commercially available magazine strips made of flat cardboard or paperboard. Furthermore, the screwing device according to the invention is lightweight and can be produced cost-effectively.

A particularly preferred embodiment of the invention is shown in the drawings and is described in more detail below. It shows:

Fig. 1 a side view of a magazine screwdriver,

Fig. 2 a C-profile of a magazine rail with a screw attached to a magazine strip,

Fig. 3 a cross section through a screw receiving chamber with a head stop insert.

The screwing device (1) has a screwdriver drive (la), a spring chamber (13) and a screwdriver head (2). The screwdriver drive (la) is connected to the spring chamber (13) by a screwdriver drive connection (12). In this there is a return spring, against the resistance of which the screwdriver drive (la) is to be moved axially and in doing so, with the screwing tool insert (16), a screw (10) is brought out of the screw receiving chamber (3) between the clamping jaws (4) and then rotated and screwed into a workpiece (W).

The clamping jaws (4) between which the screw (10) is clamped are held laterally by leaf springs (4a). The clamping jaws (4) are attached to the end of the screwdriver axis (S) and are conically shaped. Between the clamping jaws (4) there is a gap which is perpendicular to the extension of a stop of a stop device (7). The extension of the stop corresponds to a processing line which results from an alignment line on which the screws (10) are screwed in. Above the clamping jaws (4) there is the screw receiving chamber (3), which has side openings (3a, 11) through which

the screws (10) are fed in with the magazine strip (9) or the magazine strip (9) exits again. To orient the entire arrangement, a stop device (7) is mounted in a slide (6) perpendicular to the screwdriver axis (S), which consists of two right-angled legs (7a). When the screwdriver is in use, these rest on the outer edge of the reference surface (F) of the workpiece (W). The distance between the screw to be inserted and the outer edge of the surface (F) can be varied using the adjustment slide (6) with a scale attached to it. The adjustment slide (6) is locked in place with a locking screw (6a).

An arcuate magazine rail (8) is attached to the side opening (3a) of the screw receiving chamber (3), which then extends parallel to the screwdriver axis (S). As an alternative to the design shown, the magazine rail (8) is connected to the screw receiving chamber (3) on the same side as the stop device (7), axially spaced from it. The arc of the magazine rail (8) has a bending radius (R) of 5 to 10 cm.

In order to allow free access, the magazine rail (8) extends at most to the grip area of a screwdriver handle (Ig) and is long enough to accommodate a magazine strip (9) with up to 100 screws (10), preferably 30 screws (10).

The screws (10) are preferably inserted so closely spaced with their heads (10a) into the magazine strips (9) that they still have sufficient clearance when the magazine strip (9) is guided around the arch (B). This means that more screws with small heads can be used than those with large heads, e.g. profile head screws for

concealed mounting, in the magazine rail (8).

Due to the manual strip transport, no adjustments to the device are necessary if the screw spacing is different.

The combination of the simple, flat magazine strip (9) with the magazine rail {8) that encloses the heads of the screws and the strip (9) provides minimal effort for the transport and storage of the screws and provides a solid guide and holder for the screws for feeding, which in principle results in a guide with the well-known, but complex, U-shaped magazine strips, in whose U-legs the screws are held twice.

The magazine rail (8) has an approximately C-shaped cross-section. A screw (10) which is inserted into a magazine strip (9) is fed through C-shaped leg edges (8a) into the opening (3a) of the screw receiving chamber (3).

Fig. 2 shows a C-profile of a magazine rail (8) with a screw (10) attached to a magazine strip (9).

The head (10a) of the screw (10) is held in a very loose fit in the interior of the C-profile, whereby the inner edges of the C-leg edges (8a) guide the magazine strip (9) almost below the screw head (10a) and under certain circumstances rest against the screw shaft (10b). The threaded shoulder (10c) of the screw is thus directed outwards perpendicular to the magazine rail (8) between the two C-leg edges (8a).

On the side of the stop device (7) in the screw receiving chamber (3) there is a passage opening (11) for

the magazine strip (9). The empty magazine strip part {9') with the attached strip part (9) can be pulled through this opening (11), or it can be pushed in at the protruding screw ends. This makes manual screw transport easy in every processing position.

The magazine strip (9) is flexible and consists of flat cardboard or paperboard. Clamping nipple screws measuring 1 to 2 cm in length with a relatively large and heavy head (10a) can be easily fed using the magazine rail (8).

Fig. 3 shows a cross-section of a head stop (5) for a screw head (10a). This is equipped, for example, with an exchangeable, semi-cylindrical hollow stop insert (AE). The sheet metal strip that serves as a stop insert (AE) is attached using two screws (5a). The fastening tabs (5b) of the stop insert (AE) are preferably attached using the same screws (5a) that hold the magazine rail (8) to the tabs (X). In addition, one can see the clamping jaws (4) with an insertion funnel recess (FT) centrally to the head stop insert (AE), which are held together using the lateral leaf springs (4a).

Preferably, a swivel joint (14) is arranged between a screwdriver drive connection (12) and a return spring chamber (13) or (not shown) between this and the screw receiving chamber (3), the swivel joint's axis of rotation being coaxial with the screwdriver axis (S). The screwdriver head (2) can thus always be rotated into a favorable working position.

The swivel joint (14) is designed to be lockable in angular positions that are preferably 45° apart.

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The magazine rail (8) is approximately long enough so that rotation of the screwdriver is not hindered and a grip area remains free for using the pistol grip (lg) or a straight screwdriver handle, depending on the type of drive the device is equipped with. In this particularly preferred embodiment, the screw device (1) has a screwdriver handle (Ig) bent at a right angle, which, as usual, is integrally formed on the screwdriver drive (la).

In order to be able to process various types of screws with different head sizes, the magazine rail (8) is interchangeably attached to the screw receiving chamber (3) using connecting tabs (X). The profile of the magazine rail (8) is preferably approximately rectangular. Its width corresponds approximately to the width of the magazine strip (9). The clear height of the profile cross-section accommodates the screw head (10a) with the magazine strip (9) in a loose fit.

Claims (15)

Protection claims 1. Screwdriver with a handle (Ig) and with a screwdriver head (2) in which a screwing tool (1) is arranged so as to be axially displaceable against a return spring, with a screw receiving chamber (3), with spring-loaded clamping jaws (4), a head stop (5) for centering a screw (10) and an adjustment slide (6) arranged to the side so as to be displaceable perpendicular to the screwdriver axis (S) and with a stop device (7), characterized in that a magazine rail (8) for guiding a flexible magazine strip (9) with screws (10) inserted therein is led out laterally to the screw receiving chamber (3) and extends further in an arc (B) parallel to the screwdriver axis (S) and that opposite the magazine rail (8) on the screw receiving chamber (3) there is a passage opening (11) for the respectively emptied area of the magazine strip (9 ¹ ). 2. Screwing device according to claim 1, characterized in that the magazine rail (8) has an approximately C-shaped cross-section, so that a screw head (10a) together with the magazine strip (9) is guided through the C-leg edges (8a). 3. Screwing device according to claim 1 or 2, characterized in that the magazine rail (8) has an approximately rectangular cross-section. 4. Screwing device according to one of claims 1 to 3, characterized in that the magazine rail (8) is attached to the screwdriver head (2) in an exchangeable manner by means of connecting lugs (x). 5. Screwing device according to one of claims 1 to 4, characterized in that the curve (B) of the magazine rail (8) has a bending radius (R) of 5 to 10 cm. 6. Screwing device according to one of claims 1 to 5, characterized in that the magazine rail (8) is arranged so that it is connected to the screw receiving chamber (3) opposite the stop device (7) or axially spaced from it on the same side. 7. Screwing device according to one of claims 1 to 6, characterized in that the magazine rail (8) extends at most to the grip area of a handle (Ig) and is long enough to accommodate a magazine strip (9) with up to 100 screws (10), preferably 30 screws. 8. Screwing device according to one of claims 1 to 7, characterized in that a rotary joint (14) is arranged between a screwdriver drive connection (12) and a return spring chamber (13) or between the latter and the screw receiving chamber (3), the rotary axis of which is coaxial with the screwdriver axis (S). 9. Screwing device according to claim 8, characterized in that the swivel joint (14) is designed to be lockable in angular positions that are preferably separated by 45° from one another. 10. Screwing device according to one of claims 8 or 9, characterized in that the magazine rail (8) is approximately long enough so that rotation of the screwdriver is not hindered and a grip area remains free. 11. Screwing device according to one of claims 1 to 10, characterized in that between the clamping jaws (4) there is a gap which is perpendicular to the extension of a stop of the stop device (7). 12. Screwing device according to one of claims 1 to 11, characterized in that flexible magazine strips (9) consist of flat cardboard or paperboard. 13. Screwing device according to one of claims 1 to 12, characterized in that the screwdriver drive (la) has a commercially available screwdriver drive connection (12) and is an electric straight screwdriver, pneumatic screwdriver or revolver screwdriver. 14. Screwing device according to one of claims 1 to 13, characterized in that short screws (10), preferably with a length of 1 to 2 cm, in particular clamping nipple screws, can be inserted into the magazine strip (9). 15. Screwing device according to one of claims 1 to 14, characterized in that the head stop (5) is formed by a replaceable, semi-cylindrical hollow stop insert (AE).