DE9308765U1 - Holding part for knife blades and the like - Google Patents

Description

Holder for knife blades and the like

The invention relates to a holding part according to the preamble of claim 1.

To attach handles to knife blades, it is known to use two corresponding half-shells that can be connected to one another by rivets at the transition between the visible knife blade and the handle. The rivet ends are visible and require machining of the visible surfaces after the half-shells have already been joined together.

In order to avoid reworking in the area of the holding part when the half shells are already assembled, a holding part with the features of claim 1 is proposed. This connects the half shells to one another in a similar way to riveting, but without any components of the connecting elements being visible on the outer surface (visible surface) of the holding part.

The invention, the basic idea of which is based on providing a "male part" with a slight oversize in relation to the "female part", ensures that, when the half shells are pushed together, a lateral expansion of the protrusion provided on the male part and thus an uncontrolled final position of the two half shells relative to each other is avoided; rather, the radial expansion of the projection takes place in a kind of "invisible riveting" only

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takes place when the projection of the male part has come to rest on the bottom of the recess of the female part and the joining surfaces of the half shells are only slightly apart from each other. By applying external pressing pressure to the male and female part - at least in the area of the projection/recess pairing - the joining surfaces of the half shells are brought into contact with each other, while the material of the projection begins to flow as the projection expands sideways and not only fills any remaining spaces between the outer contour of the projection and the inner contour of the recess, but also presses itself firmly against the inner wall of the recess and possibly claws into it, whereby a slight deformation may even occur in the area of the recess wall.

In order to extend the contact area between the projection and the recess and thus increase the effectiveness of the firm connection of the half-shells to one another, the measures according to claim 2 are proposed. In order to obtain a similarly strong lateral compression between the projection and the recess in the root area of the projection as occurs at the free end of the projection, i.e. near the bottom of the recess, a holding part according to claim 3 is proposed.

The invention therefore makes it possible to create a rivet-like connection between the half-shells, in which a lateral expansion takes place at both ends of the component group connecting the half-shells (projection/recess pairing) under material flow. In addition, the half-

shells can be centered particularly precisely to one another by means of measures according to the invention, in particular according to claim 2, and the use of half shells made of stainless steel investment casting is possible without complicated post-processing.

The aforementioned, claimed and described in the exemplary embodiment components according to the invention are not subject to any special exceptional conditions in terms of their size, shape, choice of material and technical conception, so that the selection criteria known in the respective field of application can be applied without restriction.

Further details, features and advantages of the subject matter of the invention emerge from the following description of the accompanying drawing, in which - by way of example - a holding part for knife blades made of two corresponding half shells is shown in a sectional view.

The holding part, numbered 10 in total, for the positive and force-locking reception of a knife blade (not shown) consists of two corresponding,
Half shells (mother part 11 and father part 12) manufactured using an investment casting process from stainless steel (DIN material number 1.4308). Between the joining surfaces 13A, 13B of the half shells there are recesses 14A, 14B for receiving the knife blade. The mother part 11 has a recess 15 and the father part 12 has a projection 16 that can be pushed into the recess 15 of the mother part. Both are cylindrical but not necessarily circular in cross-section, whereby the projection 16 should be slightly smaller in cross-section than the clear cross-section of the recess 15, e.g. have a diameter a few tenths of a millimeter smaller, in order to enable the projection 16 to be pushed all the way to the bottom 17 of the recess 15 without premature lateral expansion, even with possible manufacturing tolerances. Furthermore, in the illustrated and in this respect preferred embodiment, a total of two projection/recess pairs with collar and annular groove 15 to 19 are provided, of which the second pair, however, lies in a different cutting plane and is therefore not recognizable in the drawing.

· S*

The length of the projection 16 is such that the projection 16 already rests against the bottom 17 of the recess 15 when the half shells 11 and 12 are not yet fully joined together, i.e. the joining surfaces 13A and 13B are not yet in contact with one another. In this state, the distance between the joining surfaces can be a few tenths of a millimeter, for example 3 tenths of a millimeter in the exemplary embodiment.

By pressing the half shells together under high pressure, e.g. with a 15 ton press, the material of the protrusion 16 flows, particularly at its free end area, i.e. in the bottom area of the recess 16, with lateral expansion. The joining surfaces 13A and 13B then lie against one another, preferably firmly, and a plastic deformation of the projection/recess pairing with mutual interlocking has taken place.

The projection 16 is surrounded in the area of its root 16A by a groove 18, which is circular in the exemplary embodiment, into which a circumferentially closed collar 19 of the nut part 12, which extends the recess 15 at its free end, fits tightly. In the exemplary embodiment, the outer diameter of the collar 19 is identical to the outer diameter of the annular groove 18, while the depth of the annular groove 18 relative to the joining surface 13B is slightly larger than the projection of the collar 19 relative to the joining surface 13A in order to leave the necessary axial play in this area, which is required when pressing the half shells together, with the lateral expansion of the projection 16 taking place primarily in the bottom area of the recess 15. A lateral deformation can occur if the collar 19 is correspondingly oversized (volume) with respect to the annular groove 18, but also at this end of the projection/recess pairing.

Claims (3)

PROTECTION CLAIMS 1. Holding part for knife blades and the like, consisting of two corresponding connectable
or connected half-shells made of metal (male part 12 and female part 11) for the force-fitting or form-fitting or force-fitting and form-fitting reception of the knife blade or the like between the half-shells joined together in abutting relationship, characterized, that the female part (11) has a recess (15) and the male part (12) has a projection which can be inserted into the recess (15) of the female part (11) and which is of such a length that the projection (16) already rests on the bottom (17) of the recess (15) when the half-shells (11, 12) are not yet fully joined together and when the half-shells are pressed together until they are joined together in abutting relation, the projection (16) expands laterally and is pressed against the side wall of the recess (15). 2. Holding part according to claim 1, characterized by a collar (19), in particular a sleeve-shaped collar, forming the open end of the recess (15) for surrounding the root (16A) of the projection (16) in the assembled state of the half-shells (11, 12) and at least one recess, in particular an annular groove (18), of the male part in the region of the root (16A) of the projection (16) for receiving the collar (19) in the assembled state of the half-shells. 3. Holding part according to claim 2, characterized in that the volume or the cross-sectional area of the collar (19) is slightly larger than the volume or the cross-sectional area of the at least one recess (annular groove 18).