WO2015165649A1

WO2015165649A1 - Screwdriver and method for automatically threading a screwdriver blade

Info

Publication number: WO2015165649A1
Application number: PCT/EP2015/056246
Authority: WO
Inventors: Johann Kaussler
Original assignee: Siemens Aktiengesellschaft
Priority date: 2014-04-29
Filing date: 2015-03-24
Publication date: 2015-11-05
Also published as: DE102014214515A1

Abstract

A conically separated screwdriver blade receiving area 5, 6 is used as a removable centering element for the screwdriver blade 2, said centering element being closable and re-openable in a fully automatic manner by means of a short-stroke slide. The screwdriver allows an automatic threading of the screwdriver blade 2 even when a position of a screw deviates from a target position due to component or assembly tolerances. For example, the screwdriver blade 2 can be moved towards a screw, the inner profile of which extends about an insertion funnel as an insertion aid. After the screwdriver blade 2 has been placed on the insertion funnel, the removable centering element 5, 6 is opened. The screwdriver blade 2 now has a sufficient clearance to slide into the inner profile along the insertion funnel. The screwdriver thus allows a process-secure automatic threading-in process.

Description

description

Screwdriver and method for independently threading a screwdriver blade

A screw is usually a bolt or pin, which is provided with an external thread. As a head, the screw optionally contains mold elements for a formschlüssi ^¬ conditions contact with screwing tools, which can also be sunk (inner profile). An example of this is a threaded pin ^¬, ie a screw without a head, which is provided with an inner profile ^¬.

The prior art discloses various tools for screwing and unscrewing and unscrewing, for example cordless screwdrivers, electric screwdrivers, pneumatic screwdrivers or hydraulic wrenches. The screwdrivers can be operated mobile or permanently installed. In manual operation of the screwdriver, an operator leads the

Screwdriver to correct threading the screwdriver tip si ^¬ cherzustellen. For automatic operation of a screwdriver, the screwdriver must be adjusted very precisely in front of the screw in order to ensure correct threading of the screwdriver tip.

The present invention is intended to provide an alternative to the prior art. This object is achieved by a screwdriver with a screwdriver blade, which is mounted in extension of a shaft. The screwdriver is characterized by a releasable connection between the shaft and a frame, wherein the releasable connection is arranged to center the shaft. The screwdriver is further characterized by a mechanism for making and releasing the detachable connection. The advantages mentioned below need not necessarily be achieved by the subject-matter of the independent patent claim. Rather, these may also be advantages that are achieved only by individual embodiments, variants or developments.

The screwdriver enables the self-threading of its screwdriver blade even if a position of a screw deviates from a nominal position due to component or assembly tolerances. For example, the screwdriver blade can be moved up to a screw whose inner profile is extended by an insertion funnel as an insertion. After the screwdriver blade has been attached to the insertion funnel, the releasable connection is released by means of the mechanism. Now the screwdriver blade has enough clearance to slide along the Ein ^¬ guide funnel into the inner profile. The catching area of the insertion aid can be significantly increased by releasing the detachable connection. Corresponding insertion funnels for screws can be provided with a large diameter.

Thus the screwdriver allows for an assured process inde ^¬ ended threading. Furthermore, the screwdriver can be retrofitted for different applications with little effort. The screwdriver makes it possible to dispense with expensive and expensive alternative solutions for fine positioning of the screwdriver tip.

The detachable connection is for example as a shared

Screwdriver blade pick-up with taper centering realized. As a holder, it is a connecting element which can hold the shaft in a centered position. By releasing the detachable connection is a rigid storage of

Screwdriver blade lifted in the radial direction of a cross section of the screwdriver blade.

In a further development, the releasable connection is a detachable pivot connection, which allows a rotation of the shaft about its axis even in the closed state. According to one embodiment, the releasable pivot joint connection is designed as a tapered bearing, in particular as a tapered roller bearing or conical sliding bearing.

In one embodiment, the detachable hinge connection is a radial bearing, which consists of a centering cone and a slide bush which is arranged between the shaft and the centering ^¬ rierkegel. The radial bearing is, for example, a radial-axial bearing or a radial sliding bearing.

According to one embodiment, the mechanism for producing and releasing the swivel joint consists of a short-stroke casting, on which an outer cone shell is arranged, by means of which the centering cone can be centered. The mechanism further includes a drive, in particular ei ^¬ nen short-stroke pneumatic cylinder, which is set up for a method of short-stroke carriage.

In a further development, a material of the sliding bush contains carbon. As a result, the sliding bush is self-lubricating. The centering cone is made of aluminum and the outer conical shell made of steel.

According to one embodiment, the screwdriver includes a ball joint, in particular a spherical cap bearing, via which the shaft is also supported when the mechanism has released the detachable connection.

The ball joint allows the screwdriver bit a größtmög ^¬ slop, which allows a secure threading the screwdriver blade ^¬. The screwdriver tip can now pursue movements in the radial direction of its cross section almost without reaction forces. The screwdriver blade is only stored in the ball joint. As a result, dynamic movements can be carried with little effort. By the sharing in the releasable pivot joint screwdriver blade Aufnah the moving masses are low.

In a further development of the screw with an elastic coupling, in particular a hose fitted over wei ^¬ che the shaft of the ball joint is connected to a rear engine.

According to one embodiment, the screwdriver is on one

Carriage mounted, which is a linear drive, in particular ^¬ special on pneumatic cylinder, movable. By means of the carriage, the screwdriver with the screwdriver ^blade can be approached automatically on a screw head.

In a further development, a screwdriver tip of the screw ^{ring is} rounded in the shape of a pyramid, cone or ball. The se development supports the self-immersion of the screwdriver blade in an inner profile. With slow turning, slight pressure and sufficient mobility of the screwdriver blade, it dives into the inner profile automatically.

According to one embodiment, the screwdriver with a

Equipped compression spring over which the screwdriver blade is gefe ^¬ changed stored. The compression spring allows a resilient Mitgehen the screwdriver blade, which in addition larger tolerances in the longitudinal direction of the screwdriver blade can be compensated.

A screwdriver blade fitting lightly on a centering funnel as an insertion aid for an internal profile of a screw head will slide into the inner profile if the conical or rounded screwdriver tip is over-springed on the inner surface of the centering funnel and its bearing in the ball joint is so flexible that the screwdriver blade is slightly compressed to the screw axis or the can slide profile. Finally, the screwdriver ^blade inserts into the inner profile when it is rotated slowly.

In the method for independently threading a screwing the screwdriver blade of the screwdriver is offset to an inner profile of a screw, in particular a hexagon socket, inner square, hexalobular or Innenvielzahn introduced. The screwdriver blade is over-springed on an edge of the inner profile or on an insertion aid. The detachable connection is released by the mechanism. The

Screwdriver blade is rotated slowly. The screwdriver bit fä ^¬ delt independently into the inner profile.

The method makes use of the fact, that will slide one with light force at an edge of the inner profile or an inner surface of an introduction funnel applied screwdriver tip in the inner profile when the screwdriver tip is conically or rounded, the screwdriver bit is slowly ge ^¬ rotates and sufficiently mobile is stored.

The screwdriver can be used for fully automatic operation with independent threading of the screwdriver blade.

In the following, embodiments of the invention will be explained in more detail with reference to figures. In the figures, identical or functionally identical elements are provided with the same reference ^numerals , unless stated otherwise. Show it:

FIG. 1 shows a sectional side view of a screwdriver with a screwdriver blade, a cone-shaped split screw blade holder and a spherical cap bearing,

FIG. 2 shows a sectional side view of the conically-shaped screwdriver ^{blade holder} of FIG. 1 in ^detail ,

Figure 3 is a sectional side view of

Spherical cap bearing of Figure 1 in detail, FIG. 4 shows a sectional side view of a closed pivot connection for a shaft of a screwdriver,

Figure 5 is a sectional side view of an open

Hinge connection for a shaft of a screwdriver, Figure 6 is a broken and sectioned side view of egg ^¬ nes wrench with open hinge connection during the threading in an internal profile of a screw,

FIG. 7 is an exploded view of an opened pivot connection; and FIG

8 shows a screwdriver in a perspective view.

FIG. 1 shows a screwdriver in a sectioned side view. A screwdriver tip 1 a screwdriver blade 2 is rounded spherical. The screwdriver blade 2 is mounted in Longer side ^¬ delay a shaft 30 and is located by a pin 41 on a compression spring. 4 At the opposite end of the shaft 30, this is mounted in a spherical cap bearing 7. In addition, the shaft 30 is supported via a releasable pivot joint which is divided into a cone

Schrauberklingenaufnähme is formed. For this purpose, a slide bushing 3 encloses the shaft 30 and embeds it in a centering cone 5 made of aluminum.

In Figure 1, the centering cone 5 is fixed in an outer cone shell 6. This means that the screwdriver blade 2 is fixed stably in its center position. The compression spring 4 holds the screwdriver blade 2 in Figure 1 in the forward position. Since the hinge connection is closed, that too is

Kugelkalottenlager 7 fixed. In this initial position, the screwdriver tip 1 can be brought accurately to a screw. With closed swivel joint the screwdriver blade 2 is centered in its center position. A frame of the

Screwdriver can on a sled with one

Pneumatic cylinder are moved in the direction of a screw until the screwdriver blade 2 on an edge of Innenpro ^¬ fils a screw head or on an inner surface of an insertion aid 22, for example, an insertion funnel, over springs ^¬ touches. Due to the sliding bushing 3, the screwing ring 2 is rotatable even when the pivot connection is closed. A material of the sliding bush 3 contains, for example, carbon, whereby the sliding bush 3 lubricates itself. As a material for the centering cone 5 example ^{¬ is} aluminum, while the outer cone shell 6 may be made of steel. The shaft 30 can also be made of steel, while for the screwdriver blade 2 preferably hardened steel is used.

FIG. 2 shows the detachable pivot joint of FIG. 1 in detail.

FIG. 3 shows the spherical cap bearing 7 from FIG. 1 in detail.

Figure 4 shows a sectional side view of the closed-end hinge connection, after the screwdriver blade was placed 2 via springs on a screw head or on an insertion aid for a ^¬ nenprofil In a screw head. The pin 41 has shifted by pressure of the screwdriver blade 2 to the right, whereby the compression spring 4 is acted upon.

FIG. 5 shows the opening of the pivot connection in the direction of the arrows. For this purpose, for example, a short-stroke carriage, which carries the outer cone shell 6, by means of a

Move the short-stroke pneumatic cylinder 2 cm to the left.

After attaching the screwdriver tip, the screwdriver blade 2 on the screwdriver tip is brought into contact with the screwdriver tip. be kept. The hinge connection can therefore be opened. In this way, the driver bit receives additional Be ^¬ freedom of movement. Figure 6 shows a broken and cut side view of the screwdriver. A screwdriver tip 1 of the screwdriver blade 2 threads straight into an inner profile 21, for example a hexagon socket, a screwdriver 20. Previously, the

Screwdriver tip 1 on the inner surface of an insertion, here an insertion funnel 22, offset from the screw axis over-mounted. Due to the large play in the ge ^¬ opened rotary joint connection, the screwdriver tip 1 could sink with the centering cone 5 within the outer cone shell 6 downwards, as was required in the case shown in Figure 6 for threading into the inner profile 21. The overfed longitudinal bearing of the screwdriver blade 2 on the

Compression spring 4 allows a uniform pressure force of the screwdriver tip 1 of approximately 1, while the screwdriver tip 1 slides along the insertion funnel 22 into the inner profile 21. For this purpose, the screwdriver blade 2 under the light

Bias of about I slowly turned. As Drehgeschwindig ^¬ speed is suitable for threading, for example, 10 1 / min.

The compression spring 4 pushes the screwdriver tip 1 along the insertion funnel 22 in the inner profile 21. Here, the screwdriver blade 2 is only stored in Kugelkalottenlager 7 and can follow the insertion funnel 22 free. The pivot point of the shaft 30 is located in the spherical cap bearing 7. The shaft 30 oscillates around this point.

FIG. 7 shows a perspective view of the opened hinge connection. The outer cone shell 6 is arranged in a component which can be moved by means of a short stroke slide 10.

FIG. 8 shows a perspective view of the

Screwdriver. On the back of the spherical cap bearing 7, the shaft 30 is connected by means of a hose 8 as an elastic coupling. ment coupled to a motor 9 through which the shaft 30 is driven ^¬ . To approach the screwdriver to a screw of the screwdriver is mounted on a carriage 11 which can move by means of a pneumatic cylinder 12 in the direction of the screw. The outer conical shell 6 forms part of a Kurzhubschlittens 10 in the example shown in Figure 8 embodiment, which ver ^¬ can be drive by means of a short stroke pneumatic cylinder 13, to release the pivot connection.

Although the invention in detail by the embodiments has been illustrated and described in detail, the invention is not limited by the disclosed examples and variations ^¬ re variations can be derived therefrom by the skilled artisan without departing from the scope of the invention. The described embodiments, variants, embodiments and developments can be freely combined with each other.

Claims

claims

1. screwdriver,

with a screwdriver blade (2) which is mounted in extension of a shaft (30),

marked by

a detachable connection (3, 5) between the shaft (30) and a frame, wherein the detachable connection for Zentrie ^¬ tion of the shaft (30) is arranged, and

a mechanism (6, 10) for producing and releasing the

releasable connection (3, 5).

2. Screwdriver according to claim 1,

in which the detachable connection (3, 5) is a releasable swivel joint, which allows rotation of the shaft (30) about its axis even in the closed state.

3. Screwdriver according to claim 2,

in which the releasable swivel joint connection is designed as a tapered bearing, in particular as a tapered roller bearing or conical sliding bearing.

4. screwdriver according to claim 2,

in which the releasable pivot joint is a radial bearing, which consists of

a centering cone (5), and

a sliding bush (3), which is arranged between the shaft (30) and the centering cone (5).

5. Screwdriver according to claim 4,

in which the mechanism for producing and releasing the hinge joint consists of

a Kurzhubschlitten (10) on which an outer cone shell (6) is arranged, by means of which the centering cone (5) is centered, and

a drive, in particular a short-stroke pneumatic cylinder (13), which is set up for a method of short-stroke carriage (10).

6. Screwdriver according to claim 5,

wherein a material of the slide bush (3) holds carbon ent ^¬,

- In which the centering cone (5) consists of aluminum, and wherein the outer cone shell (6) consists of steel.

7. Screwdriver according to one of the preceding claims,

with a ball joint (7), in particular a

Kugelkalottenlager, via which the shaft (30) is also stored when the mechanism (6, 10), the releasable connection (3, 5) has solved.

8. Screwdriver according to claim 7,

- With an elastic coupling (8), in particular a

Hose, via which the shaft (30) on the back of the ball joint ^¬ (7) is connected to a motor (9).

9. Screwdriver according to one of the preceding claims,

- Mounted on a carriage (11), which via a linear drive (12), in particular a pneumatic cylinder, is movable.

10. Screwdriver according to one of the preceding claims,

- In which a screwdriver tip (1) of the screwdriver blade (2) is pyramidal, conical or spherical rounded.

11. Screwdriver according to one of the preceding claims,

with a compression spring (4), via which the screwdriver blade (2) is spring-mounted.

12. Method for independently threading a screwdriver blade (2),

in which the screwdriver blade (2) of the screwdriver according to one of claims 1 to 11 is placed on an inner profile (21) of a screw (20), in particular an internal hexagon, square, hexagon socket or with internal serrations, Hérange ^¬ leads, in which the screwdriver blade (2) touches down on springs on an edge of the inner ^¬ profile (21) or an insertion aid (22)

wherein the releasable connection (3, 5) through the Mechanical- ^¬ mechanism (6, 10) is released,

in which the screwdriver blade (2) is slowly rotated, and in which the screwdriver blade (2) independently threads into the inner ^¬ profile (21).

13. Use of the screwdriver according to one of claims 1 to 11 for a fully automated operation with independent threading the screwdriver blade (2).