EP1775076B1 - Grip fixation - Google Patents

Abstract

The handle fixing system for shears (10) has conical tangs (12) on the tool side with an insertion body fitting in an axial insertion hole on the side of the handles (14), including an axial recess for the tangs. The insertion body has at least one radial window connected to the recess to guide a spreading element, which can be pressed against the conical surface of the hole wall when the tangs are inserted.

Description

The invention relates to a handle attachment for hand tools. It is common to hand tools, such as knives, files, but also garden tools to connect with a wooden handle in that a conically shaped metal fishing is pressed into a single or multi-stepped bore of the handle with excess. The flanks of the tang produced in a low inclination displace the accumulation of material in the area of the diameter jumps, and depending on the applied Axialfügekraft the bore is additionally compressed and compressed more or less strongly in the fishing edge area.

This simple way of fastening the handle has long been proven and is widely used for simplicity. When mounted in wooden handles, the durability of the connection depends on the wood density, the moisture content, the fiber flow and other wood-specific material properties. In unfavorable storage conditions, therefore, a loosening of the handle can occur, which can have serious consequences.

In order to avoid loosening and loosening of the tool with an associated risk of accidents, handle fasteners have been developed in which the adhesion has been replaced by a positive connection. In this case, spring elements are generally used, which cause a barb-like engagement after insertion of the tool shank and this often require a complicated and trouble-prone mechanics.

From the DE 201 07 381 U1 is' a handle attachment for hand tools, such as hedge trimmers or spades, known, with a tool-side conical tang, with a handle-side, axial insertion hole and an insertable insert hole in the insert body, an axial recess for the fishing rod and a radial, with the recess in Has connecting fastening opening. The tang is fixed in the axial recess of the insert body by a screw extending through the attachment opening. The insert body as such is locked in the insertion hole of the handle by locking means formed by steel balls received by transverse bores located at the tool facing end of the axial insertion hole of the handle. The insert body has at a location adjacent to the tool a circumferential tangential slot into which the steel balls located in the transverse bores by means of a rotatable relative to the handle control element are pressed, which surrounds the tool facing the end of the handle and the steel balls to the insert body set against the handle. The control and the tool-facing end of the handle in this case have a relatively complicated shape, so that the production of this handle attachment is costly. Furthermore, there is a risk of unwanted rotation of the control, whereby the connection between the tool and the handle would be solved.

The invention has for its object to provide a form-fitting operating handle attachment, which is simple in construction and easy to install and ensures a permanently secure fit.

The object is solved by the totality of the features specified in claim 1.

Embodiments of the invention will become apparent from the dependent claims. The invention can be realized in different designs, wherein the spreading causing Angel can either be designed as a flat iron with conical side walls or has a polygonal or round cross-section and over the circumference more in the insert body mounted spreader be provided.

• Fig. 1 ist eine Ansicht einer geschlossenen Heckenschere;
• Fig. 2 ist eine Ansicht der Heckenschere vor der Montage der Griffbefestigung;
• Fig. 3 zeigt in größerem Maßstab als Einzelheit die Griffbefestigung vor dem Einsatz der Spreizelemente;
• Fig. 4 zeigt eine perspektivische Ansicht der zweiten Griffbefestigung nach Einsatz der Spreizelemente;
• Fig. 5 ist ein Axialschnitt eines Griffes mit durch die Griffbefestigung festgelegter Werkzeugangel;
• Fig. 6 ist ein Schnitt nach der Linie VI-VI gemäß Fig. 5.

Hereinafter, an embodiment of the invention will be described with reference to an embodiment designed as a hedge trimmer. In the drawing show:

• Fig. 1 is a view of a closed hedge trimmer;
• Fig. 2 is a view of the hedge trimmer before mounting the handle attachment;
• Fig. 3 shows on a larger scale as a detail of the handle attachment before the use of the expansion elements;
• Fig. 4 shows a perspective view of the second handle attachment after use of the spreading;
• Fig. 5 is an axial section of a handle with fixed by the handle attachment tool fishing;
• Fig. 6 is a section along the line VI-VI according to Fig. 5 ,

In the drawing, the invention is illustrated by a hedge trimmer. However, the handle attachment shown here is versatile and applicable wherever a tool handle, i. the tooling must be anchored in a handle. The handle is preferably made of wood, but it can also be made of plastic.

The hedge trimmer 10 shown in the drawing has two hinges 12, at which the handles 14 are to be connected to the handle attachment according to the invention. The hinges 12 are formed as flat iron and taper conically towards the end of the insert, where on both sides locking notches 16 are formed. Each handle has a cylindrical axial insertion hole 18 into which an insert body 20 can be inserted. This insert body 20 is dimensioned so that it can be inserted without play into the insertion hole. It consists of a substantially square extruded profile made of metal or plastic, which is provided with roof edge-shaped longitudinal ribs 22 which rest against the hole wall 18 with slight excess tolerance compensation between the bore and insert body, which can be done by the excess digging into the hole wall. With the insert body 20, a sleeve 24 is connected, which encloses a stepped recess at the front end of the handle in the mounted state. With each sleeve, a buffer 26 is connected, and the two buffers elastically limit the closing movement of the scissors in the mounted state. The buffer and the insert body 20 are provided with a continuous axial slot 28, which is adapted in cross section to the cross section of the tang 12.

Each insert body 20 has laterally two opposite radially extending window 30, in the spreading elements 32 can be used with radial guidance. These spreading elements made of sheet metal have on the outer side bent anchoring claws 34 and on the other side inwardly bent tabs 36, which lead between them the flat iron of the fishing rod 12 and can take over a latching function with on-hook undercut.

For assembly of the insert body 20 is first inserted into the insertion hole 18 of the handle 14. The roof edge-shaped longitudinal ribs of the insert body dig into the hole wall without play. In the embodiment, a circular cylindrical arrangement is provided. However, any other cross-sectional shapes are conceivable, wherein a slight taper between the outer guide ribs of the insert body and the hole wall may be present in order to improve the play-free fit. Before plugging in the spreading elements 32, as from the 3 and 4 can be seen, plugged into the window 30. Thereafter, the provided with the insert body 20 handle 14 is pushed onto the rod 12, wherein the tang is guided through the slot 28 and is supported with its conical side surfaces of the spreading elements 32 between the lobes 36. Upon further insertion, the spreading elements 32 are pressed by the conical tang 12 to the outside, wherein the claws dig into the hole wall 18, whereby a positive connection between the handle and insert body 20 comes about. After the hinges are fully inserted, snap resilient latching arms 17 in the notches 16 of the fishing rod at the end of the Einstielvorganges and the inner design of the insert body limits the remaining degrees of freedom of Scherenangel.

Above, the handle attachment was described with a trained as a flat iron scissors. However, it is also possible to provide a fishing rod with a polygonal or round cross-section and form the insert body accordingly. The spreading can then be distributed not only in pairs, but also in larger quantities at the same angular distance. In general, it will be sufficient for a reliable attachment to provide at one point in the central region of the spreading elements, however, it is also possible to provide several Spreizkörperpaare or arrangements distributed over the length.

LIST OF REFERENCE NUMBERS

10

hedge clippers

12

fishing rod

14

handle

16

notches

17

locking arms

18

insertion hole

20

insert body

22

longitudinal ribs

24

cuff

26

buffer

28

slot

30

window

32

spreading

34

anchoring claws

36

cloth

Claims (10)

1. A handle fixing for hand tools, in particular for hedge clippers, comprising

   - a conical tang (12) at the tool side,

   - an axial insertion hole (18) at the handle side, and

   - an insertion body (20) which can be fitted into the insertion hole (18) and which has an axial opening (28) for the tang (12),

   wherein the insertion body (20) has at least one radial window (30) communicating with the opening (28),
   characterised in that

   - the insertion body has at least one spreading element (32) for latching engagement of the tang (12), and

   - the spreading element (32) is guided in the at least one window (30) of the insertion body (20) and when the tang (12) is inserted can be pressed by the conical surface thereof against the wall of the insertion hole (18).
2. A handle fixing according to claim 1 characterised in that the insertion body (20) has a plurality of windows arranged at the same angular spacing, with guided spreading elements (32).
3. A handle fixing according to claim 2 characterised in that the tang (12) is in the form of a flat bar with conical side walls co-operating with two spreading elements displaceable diametrally in windows in the insertion body.
4. A handle fixing according to claim 1 characterised in that at its inner end the tang (12) has latching notches (16) providing axial positively locking engagement with the insertion body (20).
5. A handle fixing according to claim 1 characterised in that the insertion body (20) is guided without play in the insertion body (18).
6. A handle fixing according to claim 5 characterised in that the insertion body (20) is equipped as a shaped body with axial roof edge-shaped guide ribs (22) which dig into the insertion hole wall for tolerance compensation.
7. A handle fixing according to claim 1 characterised in that the insertion body (20) carries a collar (24) which in the assembled condition surrounds the handle end at the tool side.
8. A handle fixing according to claim 7 characterised in that the collar (24) is provided with lateral buffers (26).
9. A handle fixing according to claim 1 characterised in that the spreading elements are in the form of sheet metal with anchoring claws (34) which project at the end at one side and which have bent-over lugs (36) on the inside with a latching function on the tang (12) as guide surfaces.
10. A handle fixing according to one of claims 1 to 9 characterised in that the windows (30) are rectangular or polygonal or round and are provided with lateral guide surfaces.

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