DE202011004990U1 - riving knife - Google Patents

Abstract

Splitting wedge with a base body (20) made of aluminum which provides a first wedge surface (4) and a second wedge surface (5), which has a cutting edge (6) on one side and a wedge head (2) providing a striking surface (3) on the other side, the first wedge surface (4) a sawtooth profile (11) and the second wedge surface (5) has a herringbone profile (14), the wedge surfaces (4, 5) in the direction of the cutting edge (6) each merging into a shoulder surface (22), the in Extension of the first wedge surface (4) formed by a triangular barb (17) and a guide rib (18), which guide rib (18) is formed in the longitudinal direction and is centered on the cutting edge (9) of the cutting edge (6).

Description

The invention relates to a riving knife with a base made of aluminum. The base body provides a first wedge surface and a second wedge surface and has a cutting edge on one side and a wedge head on the other side providing a striking surface on the one end.

Splitting wedges are well known from the prior art, which is why it does not require a separate documentary evidence on the merits. It is therefore only exemplary on the DE 20 2009 000 235 referenced, which discloses a riving knife in the particular embodiment as a rotary gap wedge.

In addition to riving knobs felling wedges are known from the prior art, with respect to which, for example, on the DE 921 601 , the DE 296 12 469 and the DE 203 14 185 referenced.

In the case of wedges, it is quite important to distinguish between felling wedges on the one hand and riving knobs on the other. The respective field of application is completely different, which is also reflected in the wedge design.

Felling wedges are basically used to keep open a felling cut. In the intended use case prevents a felling wedge that the weight of the tree to be felled presses on the chainsaw or the power saw blade and this clamps. In addition, the felling wedge serves to drive the trunk of the tree to be felled further with each stroke in the direction of precipitation. When handled correctly, the tree to be felled is therefore not "re-sawn", but "folded over". To achieve this, the felling wedge should be inserted as early as possible into the felling cut. Afterwards you have to turn to wedging and cutting until the correct break line width is reached, which then leads to the precipitation of the tree.

In order to prevent a felling wedge inserted into a felling cut from slipping back out of the felling cut, ie sliding back or sliding, it is known from the prior art to equip the wedge surfaces with projections in the region of the felling wedge close to the cutting edge. This is for example from the DE 921 601 known. Furthermore, it is known to equip the wedge surfaces of a felling wedge with longitudinal ribs and / or V-teeth, such as from the DE 203 14 185 , As a material for previously known felling wedges is in particular plastic or aluminum in question, whereby a combined use of these materials is possible, such as with the DE 296 12 469 disclosed.

In contrast to a felling wedge, a riving knife serves to split wood, in particular firewood. It is used in particular in connection with a chipping hammer. Unlike a felling wedge, a riving knife is usually not introduced into a saw cut formed by a saw. For this reason, a riving knife also has a comparatively sharp cutting edge, which facilitates the attachment to the wood to be split. As a rule, splitting wedges are made of aluminum. Plastic as a material has not prevailed here. This is more likely to be used on felling wedges.

A special form of the splitting wedge is the rotary splitting wedge. Rotary splitting wedges are characterized in that the wedge surfaces are formed twisted to each other, depending on the embodiment between 45 ° to 90 °. Due to the rotation of the wedge surfaces widens the wedge angle of the wedge, which increases the impact effect when driving the wedge.

In order to counteract a "jumping out" of the same when splitting the splitting wedge, it has become known from the state of the art to equip the peripheral surfaces adjoining the wedge surfaces of the wedge with a sawtooth profile. Such a riving knife is for example from the DE 20 2009 000 235 known.

Although wedges in different embodiments of the prior art have become known in many variations, there is a need for a novel trained riving knife, which allows in particular a simplified handling due to its structural design. It is therefore the object of the invention to propose a novel splitting wedge.

To solve this problem, the invention proposes a splitting wedge with a first wedge surface and a second wedge surface providing basic body made of aluminum, the one end has a cutting edge and the other end has a striking surface providing wedge head, wherein the first wedge surface a sawtooth and the second wedge surface a herringbone wherein the wedge surfaces merge in the direction of the cutting edge in each case in a lug surface, wherein formed in extension of the first wedge surface lug surface has triangular shaped barbs and a guide rib, which guide rib extending in the longitudinal direction is formed centrally to the cutting edge of the cutting edge.

The splitting wedge according to the invention has, in a manner known per se, two wedge surfaces. It is provided that one of the two wedge surfaces has a sawtooth profile and the other of the two wedge surfaces has a herringbone profile. Both the sawtooth profile and the herringbone profile should ensure the intended use case wear, that the splitting wedge anchored in the wood, so that a "jumping out" due to impact stress and a simple "slipping out" of the splitting wedge from the hitting cut or Fällschnitt is prevented. The design of such profiles is not unknown from the prior art per se. The peculiarity of the invention is that the two profiles are combined. This profile combination provides the synergistic effect of an improved anchoring of the wedge in the wood. This is because, due to the fiber structure of the wood, it may happen that a profile formed in a certain way fails and a secure hold of the wedge in the wood, in particular, is prevented from "jumping out". Due to the combination of two differently formed profiles, this danger can be avoided. If the wedge lock fails with respect to one of the two profiles, at least the other of the two profiles will engage. But even if both wedge profiles cause a desired anchoring of the wedge in the wood, the different profile choice has the additional advantage that a particularly secure hold of the wedge is guaranteed in the wood, which in particular the risk of "jumping out" due to a shock, for example guaranteed by a splitting hammer.

The above-described profile design is combined with the design of barbs. In this case, it is provided that the barbs are formed close to the cutting edges in the region of a connecting surfaces connecting the wedge surfaces with the cutting edge. Such barbs also serve the fall protection. In contrast to the above-explained profile design, however, the barbs should not serve to secure the already driven wedge from "jumping out" or "slipping out". Rather, the barbs essentially serve to hold the wedge after insertion into the gap cut or the fell cut or to securely position it after impact so that subsequently a wrenching or driving in of the wedge according to the intended purpose is enabled, d. H. In particular, the risk of tipping over before the introduction of a first Eintreibschlag is banned.

According to the barbs are combined with a guide rib. This guide rib is formed in the longitudinal direction of the wedge and aligned centrally with the cutting edge of the cutting edge of the wedge. The purpose of this guide rib is to ensure a straight drive of the wedge. In particular, a tilting of the wedge within the Fällschnittes or the gap cut should be avoided.

The peculiarity of the splitting wedge proposed by the invention lies in the synergetic effect which results from the combination of the individual features explained above, ie. H. the combined design of sawtooth profile, herringbone profile, barbs and guide rib. So far, these individual measures have not been used or used in combination. This is because so far in the professional world was the prejudice that one of the mentioned measures would be sufficient to ensure an effective jump-out or slip-out. With the embodiment according to the invention, it has now surprisingly been found, for the first time, that a significant improvement has been achieved in a constructive combination of the measures explained above, and in particular the spring-out protection has been considerably improved. Thus, the splitting wedge according to the invention proves to be much safer and simpler to handle than the splitting wedges previously known from the prior art. This achieved with the inventive design significant improvement is due to the synergistic effect that sets in combination, in particular the sawtooth profile and the herringbone profile on the one hand and the barbs and the guide rib on the other hand. Barbs were so far only with felling wedges used, which is why in the professional world, the prejudice was that they can not be transferred to a riving knife, namely because the riving knife unlike a felling wedge usually not introduced in a Fällschnitt, but on the processed, in usually to be split wood is used.

Thanks to the embodiment of the invention is now ensured that the riving knife in the intended manner can be recognized as follows. With a first blow, which can also be referred to as fixation impact, the riving knife is driven into the wood to be split. As a result, a gap cut is formed, in which the splitting wedge anchored or digs thanks to its barb configuration. The guide rib formed in combination with the barbs serves to ensure that the riving knife is guided in a straight line. After completion of this fixation impact the riving wedge sits securely in the gap cut, held by the barbs. In the course of further driving of the splitting wedge then take over the already explained and trained on the wedge surfaces holding the splitting wedge in the wood, which is ensured due to the different design of the profiles that improved protection in particular against a "jumping out" of the wedge from the gap section is guaranteed. This protective effect is particularly evident in very humid or wet wood, since the herringbone profile design, unlike the sawtooth profile design does not have ribs, but via grooves that allow for increased water or Saftabtransport in the direction of the open gap.

The wedge head of the splitting wedge may be formed oval in cross-section, which means according to the invention a deviating from the circular configuration shape. In a particularly preferred embodiment of the invention, the wedge head may be elliptical in cross-section, which represents a special form of the oval design.

The cross-sectionally oval design of the wedge head of the splitting wedge improves its handling. This is because the oval cross-sectional configuration makes it possible to haptically recognize the position alignment of the splitting wedge when it is received in the splitting wedge. Due to the "non-round" configuration of the wedge head, it is possible for a user of the splitting wedge to recognize the orientation of the splitting wedge with respect to its wedge surfaces by simply touching the wedge head by hand, d. H. without looking. This simplifies the handling of the splitting wedge as a whole, since it can be used virtually "blindly" without the user being in danger of unintentionally twisting or incorrectly aligning the splitting wedge or of introducing it into a gap cut.

It is preferred a geometric configuration with respect to the splitting wedge, according to which the wedge head is elliptical in cross-section and extend from the base body of the splitting wedge provided wedge surfaces in the direction of the major axes of the elliptical wedge head. The end faces of the splitting wedge accordingly run in the direction of the small semi-axes of the elliptical wedge head. A user can thus by simply take in the hand of the wedge head due to haptic Sennsierung recognize how the riving knife with respect to the wedge surfaces provided by it comes to rest in the hand.

According to a further feature of the invention, it is provided that adjoin the wedge surfaces in the direction of the cutting edge, the already described approach surfaces, the wedge surfaces thus pass over with the interposition of the approach surfaces in the cutting edge. In this case, a shoulder surface provided with bevels on the front side, so that the result is a cutting edge, which lies in a plane with the major half-axes of the elliptical wedge head preferably formed in cross-section, but formed in their geometrical dimensions smaller than the sum of the two semi-axes is. This embodiment allows a simplified introduction of the wedge in a Fällschnitt. In addition, a preparation of the wedge is simplified on a splitting wood. For the first drive, according to a further advantage of this embodiment, less force is required, i. H. in comparison to a design without chamfers according to the invention. In order to reduce the driving force further cutting surfaces are provided according to a further feature of the invention, which are dimensioned in their angular configuration such that a sharp-edged tapered edge is formed.

The required for a first driving Eintreibkraft can be reduced by the way even in an advantageous manner that only one of the two approach surfaces has barbs and / or a guide rib. In order to ensure a secure hold of the wedge in a gap cut after a first driving, it is sufficient to equip only one of the two approach surfaces with corresponding barbs or a guide rib. The other of the two approach surfaces, however, can be made smooth, in order to make the smallest possible driving force required. It is preferably provided that the barbed or a guide rib equipped approach surface is formed in extension of the first wedge surface, d. H. that wedge surface which has the sawtooth profile. This embodiment is preferred because the wedge surface equipped with the sawtooth profile preferably has two juice grooves which are formed in extension of the preferably paired barbs. Due to the barbs caused by the material displacement in the water squeezed water can be transferred directly into the barbs in the longitudinal direction of the wedge subsequent juice grooves. The handling of the wedge is thus simplified and safer overall.

The end faces of the wedge are in contrast to the embodiment, for example, after DE 20 2009 000 235 smooth. Investigations have shown that in particular the profiled configuration of the wedge surfaces offers a "jump-out" protection, which is why the wedge according to the invention differently than according to the teaching of DE 20 2009 000 235 not the end faces, but the wedge surfaces are formed profiled.

Further features and advantages of the invention will become apparent from the following description with reference to FIGS. Showing:

1 in a first plan view of the wedge according to the invention;

2 in a side view of the wedge according to the invention;

3 in a second plan view of the wedge according to the invention;

4 the wedge according to the invention in the view according to arrow IV 1 ;

5 in a first perspective view of the wedge according to the invention;

6 in a second perspective view of the wedge according to the invention;

7 in a first perspective view of the wedge according to the invention in a second embodiment and

8th in a second perspective view of the wedge according to the invention in a second embodiment.

The 1 to 6 let recognize the riving knife according to the invention in a first embodiment. The 7 to 8th show the riving knife according to the invention in a second embodiment, in the embodiment as a rotary gap wedge.

The riving knife is made of aluminum or an aluminum alloy. It is integrally formed preferably as a forging or casting. He has a basic body 20 , This has einendseitig a wedge head and the other end a cutting edge 6 on.

The wedge head 2 represents a clubface 3 ready. This clubface 3 is how in particular the representation after the 1 . 3 and 4 can detect, in the direction of the transverse axis 25 crowned. This crowned embodiment provides the advantage that a simplified impact action with a striking tool, such as a chipping hammer is possible. One is a more targeted meeting of the wedge head 2 allows and damage the wedge 1 at an off-center on the wedge head 2 incoming impacts are largely avoided. In addition, even in the case of a non-central force action, an introduction of force essentially takes place in the direction of the longitudinal axis 24 ie in the longitudinal direction 26 of the wedge 1 , see. 3 , The occurrence of lateral forces is substantially prevented.

The 7 and 8th show the wedge according to the invention in the particular embodiment as a rotary gap wedge. According to this particular embodiment is the wedge head 2 oval in cross section, preferably elliptical. This type of wedge head design allows a user to align the wedge 1 to haptically capture in the user's hand receiving it.

The main body 20 represents two wedge surfaces 4 and 5 ready. These wedge surfaces are, in particular a synopsis of 1 and 3 recognizes, facing each other and towards the cutting edge 6 aligned. The circumference of the two wedge surfaces 4 and 5 interconnecting faces 21 are also in the direction of the cutting edge 6 aligned, which in particular from a synopsis of 6 and 7 results. This orientation of the wedge surfaces 4 and 5 or the peripherally connecting end faces 21 can be the user side by the seizure of the wedge head 2 if this is the case in the case of training 7 and 8th a wedge head 2 having oval cross-section.

The first of the two wedge surfaces 4 is with a sawtooth profile 11 equipped, as for example in 3 is shown. The sawtooth profile 11 consists of a plurality of ribs 12 in the longitudinal direction 26 of the wedge 1 are preferably equally spaced from each other. When used as intended, the sawtooth profile claws 11 stuck in the wood, causing a backward sprouting of the wedge 1 is prevented.

For the purpose of discharging liquids, especially tree sap, two juice grooves can be used 13 on the wedge surface 4 be educated.

The second wedge surface 5 is unlike the first wedge surface 4 not with a sawtooth profile 11 but with a herringbone profile 14 equipped. This is the herringbone profile 14 not by ribs, but by depressions in the form of grooves 15 formed, which grooves are V-shaped, so have part legs, which are transverse to the longitudinal axis of the wedge 1 are aligned. The grooves can 15 longitudinal 26 of the wedge 1 are preferably not equally spaced from each other. However, a spacing arrangement is preferred, according to the distance between two adjacent grooves 15 towards the wedge head 2 increases as well as this, in particular, the presentation 1 can be removed. Also the wedge surface 5 can with a juice groove 16 be equipped, as is 1 or 5 results.

The wedge head 2 opposite is a cutting edge 6 intended. The wedge surfaces go 4 and 5 in the cutting edge 6 with interposition of one approach surface 22 above. This approach surface 22 is on the one hand with triangular shaped barbs 17 as well as a leadership rib 18 equipped. Here are the barbs 17 in particular the fall protection at an insertion of the wedge 1 into a gully or after a first driving it into wood to be split. The purpose of the leadership rib 18 There is a guide for the wedge 1 to make sure that this can preferably be driven straight into the wood to be split. The leadership rib 18 is therefore preferably in the longitudinal direction 26 of the wedge 1 longer than the barbs 17 trained and otherwise preferably centrally to the cutting edge 6 aligned.

The cutting edge 6 in turn has a cutting edge 9 as well as cutting surfaces 7 and 8th , Here are the cutting surfaces 7 and 8th at a more acute angle than the lug surfaces 22 or the wedge surfaces 4 and 5 , In this way, a particularly tapered cutting edge 9 which is robust and has little tendency to dull.

Incidentally, it can be provided that the approach surfaces 2 a bevel 10 towards the cutting edge 6 deploy, so as a result the cutting edge 6 with respect to the leaf level, for example, after the 7 and 8th narrower than the wedge head 2 is trained. A simplified attachment of the wedge in the intended use case is achieved.

The faces 21 of the wedge 1 are preferably smooth. In the upper part of the wedge 1 , ie near the wedge, in particular for the purpose of weight reduction notches 19 be provided. Incidentally, the notches allow 19 Improved handling by a user, as they favor grasping and holding the wedge.

LIST OF REFERENCE NUMBERS

1

riving knife

2

wedge head

3

Playing surface

4

first wedge surface

5

second wedge surface

6

cutting edge

7

cutting surface

8th

cutting surface

9

cutting edge

10

bevel

11

sawtooth

12

rib

13

sap groove

14

fishbone

15

groove

16

sap groove

17

barb

18

guide rib

19

score

20

body

21

face

22

approach surface

23

transverse groove

24

longitudinal axis

25

transverse axis

26

longitudinal direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202009000235 [0002, 0009, 0022, 0022]
• DE 921601 [0003, 0006]
• DE 29612469 [0003, 0006]
• DE 20314185 [0003, 0006]

Claims (9)

Splitting wedge with a first wedge surface ( 4 ) and a second wedge surface ( 5 ) providing basic body ( 20 ) made of aluminum, the one end a cutting edge ( 6 ) and at the other end one a striking surface ( 3 ) providing wedge head ( 2 ), wherein the first wedge surface ( 4 ) a sawtooth profile ( 11 ) and the second wedge surface ( 5 ) a herringbone profile ( 14 ), wherein the wedge surfaces ( 4 . 5 ) in the direction of the cutting edge ( 6 ) each in a lug surface ( 22 ), wherein in extension of the first wedge surface ( 4 ) trained approach surface ( 22 ) triangular shaped barbs ( 17 ) and a leadership rib ( 18 ), which guide rib ( 18 ) running in the longitudinal direction centered to the cutting edge ( 9 ) of the cutting edge ( 6 ) is trained. Splitting wedge according to claim 1, characterized in that the sawtooth profile ( 11 ) on individual mutually spaced ribs ( 12 ) is formed. Splitting wedge according to claim 2, characterized in that the ribs ( 12 ) parallel to the cutting edge ( 9 ) of the cutting edge ( 6 ) are formed running. Splitting wedge according to claim 1, characterized in that the herringbone profile ( 12 ) Grooves ( 15 ) facing the cutting edge ( 9 ) of the cutting edge ( 6 ) are formed transversely. Splitting wedge according to claim 4, characterized in that the grooves ( 15 ) Are V-shaped. Splitting wedge according to claim 4 or 5, characterized in that the distance between two adjacent grooves ( 15 ) in the direction of the wedge head ( 2 ) increases. Splitting wedge according to one of the preceding claims, characterized in that the first and the second wedge surface ( 4 . 5 ) one juice chute ( 13 . 16 ) exhibit. Splitting wedge according to one of the preceding claims, characterized in that the striking surface ( 3 ) of the wedge head ( 2 ) is formed spherical. Splitting wedge according to one of the preceding claims, characterized in that the wedge head ( 2 ) is oval in cross-section, preferably elliptical.

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