JP2001071302A - Cutting link with depth limiting part molded by upsetting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the entire onstitution and structure and satisfactorily match a cutting force with an advance feed force to ensure an effective support by molding the roof face of a depth limiting part with the help of a material part molded by upsetting of a chain link. SOLUTION: A roof face 12 equipped with a depth limiting part formed by an edge part 14 is formed by upsetting or swage molding for a diameter expanding process in the height direction of a front body part 9 formed as a carrying fine strip part. A protruding part 18 is formed on the longer sides 19, 20 of a body 2. The equilibrium state of a force in a cutting link is ensured by symmetrically forming the roof face 12 with regard to the face 11 of the body 2 and it is possible to guide the cutting link certainly. The roof face 12 may be formed flat or may have an inclined face 12a to the side edge. Alternately, the roof face 12b may be askew to the center face 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting link for a saw chain of a power chain saw, comprising a main body, the main body being formed with a rivet hole for coupling with another chain link; A cutting tooth having a roof blade and a side blade, the cutting tooth having a cutting tooth provided on a rear body portion in the traveling direction of the cutting link, and a depth limiting portion preceding the cutting tooth, The limiting portion has a roof surface provided on the side opposite to the main body and inclined in the traveling direction, the roof surface being located in a lateral direction to the traveling direction and a leading ridge; And the trailing edge adjacent to the cutting tooth is at a position lower than the roof blade, and the leading edge of the roof surface is at a position lower than the trailing edge. It relates to one of the disconnection links.

[0002]

2. Description of the Related Art A cutting link of this kind is disclosed in U.S. Pat.
No. 0715 is known. This known cutting link comprises a body, which has rivet holes for coupling with other chain links (ie, side links and center links). Further, the main body has cutting teeth provided with a roof blade and side blades, and a depth limiting portion is provided on the main body in front of the cutting teeth in the traveling direction. The depth limiter has a roof surface on the side opposite to the main body, the roof surface being inclined in the traveling direction, the roof surface being provided with a preceding ridge located laterally to the traveling direction, And a trailing edge located in the direction. The trailing edge adjacent to the cutting tooth is lower than the roof blade of the cutting tooth. The leading edge of the roof surface is located lower than the trailing edge.

In order to form the depth limiting portion, first, the position of the carrying strip formed on the main body is adjusted outward from the surface of the main body.
Folding the free end of the body in the opposite direction at a substantially right angle results in the free end of the body being located transverse to the body. The bent free end of the carrying strip forms the roof surface on the side opposite to the main body, and the roof surface is formed so as to be inclined in the running direction, so that the leading edge of the roof surface is trailing. Will be located lower than the ridge.

In order to form a depth limit, the free end of the carrier strip must be bent, which is structurally
This is only possible if the folded-down portion of the carrying strip is large enough. In practice, it has been found that the length of the folded sag of the carrier strip must be at least approximately 1.5 times the material thickness. It is clear from this that the depth limit formed by folding cannot be less than the minimum size.
When the cutting teeth are engaged with the cut object, the ridge on the cutting surface side of the roof surface acts as a support surface. The stronger the cutting teeth are pushed into the cut, the stronger the action of the roof surface connected to the support surface in the running direction and the higher the advance feed pressure. The cutting force decreases.

Thus, the size of the roof surface, which is limited by the size of the depth limiting portion, increases the forward feed pressure, thereby reducing the cutting force. In order to obtain a satisfactory cutting force, a suitably large driving force must be provided, that is, a large driving motor is required.

[0006] When the cutting teeth are re-ground, the depth limiting portion is also cut off in order to adjust the heightwise interval between the trailing edge of the roof surface of the depth limiting portion and the roof blade. In this case, the length of the roof surface of the depth limiter measured in the traveling direction is shorter,
It has little effect on the entire surface of the depth limit, and thus has little effect on the required forward feed force.

The above-mentioned known depth limiting portion having a large area can provide an excellent supporting action as much as possible. However, the silence and the stability of the cutting teeth in the cutting groove are not improved in the running direction. The location of the support in the lateral direction is also important. When bending the depth limiting part, a displacement occurs in the transverse direction to the running direction due to the bending radius due to manufacturing technical reasons. This misalignment can be partially corrected by pre-bending the carrier strip in the opposite direction, but adds to the structural manufacturing costs.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cutting tooth having such a depth limiter, which is simple in construction and manufacture as a whole, and in which the cutting force and the forward feed force are satisfactorily matched. And ensure that effective support is assured.

[0009]

In order to solve the above-mentioned problems, the present invention is characterized in that the roof surface of the depth limit portion is formed by the upsetting material portion of the chain link. .

In order to form the roof surface, the material part of the chain link, in particular provided as a carrying strip, is freed from the material at the free end of this material part by at least one part of the body.
Advantageously, it is upset in the height direction so that it converges on one longitudinal side, preferably on both longitudinal sides. This makes the end face of the carrying strip wider in the transverse direction to the running direction of the cutting link, thus forming a depth limit with a roof surface which is desirable for support, the roof surface being effective over the entire width of the kerf. Can be extended. The roof surface of the depth limit formed by the upset edge of the carrying strip can be manufactured to exactly 1/10 mm in size and position in the upset process alone, so that the structure is This is convenient because the simple supporting surface contacts the groove bottom. The cutting link is reliably guided at the time of engagement, does not cause a problem even if it penetrates deeply into the cut object, and assures that the thickness of the chip is given structurally in advance, thereby contributing to an improvement in silence.

The upsetting of the edge of the carrier strip can be carried out in a simple manner, with the aid of suitable facing dies which bring the depth limit or its roof into various suitable shapes suitable for the application. be able to. The simple construction of the depth limit allows the cutting link to be set between the desired cutting force and a satisfactory forward feed pressure. Therefore, the shape and size of the effective support surface and the shape and size of the roof surface connected to the support surface in the traveling direction are appropriately configured.

It is expedient for the leading edge of the depth limit to be shorter in the transverse direction to the running direction of the saw chain than the length of the roof surface forming the support surface. In particular, a symmetrical construction of the depth limit or the roof surface is easily possible, in which case it can be made symmetrical with respect to the plane of the body of the cutting link. Due to the symmetrical configuration of the depth limit, the cutting link is uniformly supported and therefore experiences only a small lateral force in the direction transverse to the direction of travel.

Other features of the present invention are apparent from the other claims, the following description and the drawings.

Next, an embodiment of the present invention will be described in detail.

FIG. 1 shows a cutting link 1 for a saw chain of a power chain saw. This type of saw chain is well known (see, for example, US Pat. No. 5,740,715).

The cutting link 1 has a body 2 which is used to connect the cutting link 1 to another chain link.
It has three rivet holes 3. The cutting link 1 moves in the saw chain complex in the running direction 4,
, A cutting tooth 6 is formed in the rear body portion. The cutting tooth 6 has a side blade 7 in the running direction 4
And a roof blade 8 in a lateral direction with respect to the roof blade 8. The cutting teeth 6 are preceded by a depth limiting part 10, which is formed in the body part 9 in front in the running direction 4.
As can be seen in particular from FIGS. 2 and 3, the front body part 9 is formed substantially as a carrying strip and lies substantially in the plane of the body 2 but may be slightly curved if desired.

In order to form the roof surface 12 of the depth limiter 10, the front body 9, which is formed as a support strip, is expanded in the direction of the arrow 13, preferably in the height direction, for expansion. For example, upset or upset molded (sta
The upset edge 14 forms the depth limit 10 or the roof surface 12 with the support surface 32. The support surface 32 is already illustrated by the trailing edge 19 of the roof surface 12, but may in each case be produced by post-grinding. Suitably, the support surface 32 is preferably molded in a new state.

1 and 2, the roof surface 12 has ridges 15 and 17 which are located transversely to the running direction 4, with the roof surface 12 moving forward in the running direction 4. Inclined (see FIG. 1).

The ridge 15 on the cutting tooth 6 side, that is, the roof surface 1
The trailing ridge 2 is located at a position deeper than the roof blade 8 of the cutting tooth 6 by an amount a, which determines the chip thickness. The leading edge 17 of the roof surface 12 is
The position is deeper by the amount b than that. In this case, trailing edge 1
5 is used as the support surface 32 in a new state of the saw chain. Note that the support surface 32 is cut off when the chain is post-ground, and expands planarly in the running direction 4. As shown in FIG. 1, the support surface 32 is located substantially parallel to the bottom of the kerf or substantially parallel to the surface 41 formed by the rivet axis 40, while the roof surface 12 is inclined forward in the running direction 4. ing.

The formation of the roof surface 12 of the depth limiter 10 by upsetting on the surface 11 of the cutting link 1 is effectively performed using simple means, the flowable material being opposed to a die, a female die or It is possible to easily bring the desired shape by using something similar to these or by appropriately configuring the progressive type. What is particularly important in this case is that the roof surface connects to the carrying strip of the front body part 9 in the central region. This wear-resistant area ensures that the roof surface of the depth limiter is joined to the front body part and that a high stability is maintained even after a number of subsequent grindings.

As shown in FIGS. 3 to 5, the projections 18 provided on one longitudinal side 19 or 20, or on both longitudinal sides 19 and 20, may be provided symmetrically or asymmetrically (dashed lines in FIG. 5). Each configuration allows for an advantageous use of the cutting link.

It is expedient if the roof surface 12 and the supporting surface formed on it are formed symmetrically with respect to the surface 11 of the body 2 in plan view. This ensures an equilibrium of forces at the cutting link, which contributes to reliable guidance of the cutting link and of the entire saw chain in the cutting groove.

As shown in FIG. 3 to FIG.
Advantageously, 2 is formed flat, but it may also rise towards the center of the chain, as indicated by the dashed line in FIG. When it comes into contact with the bottom of the cut groove, a reaction force directed toward the center of the guide rail or the chain is generated, which contributes to silence.

When upsetting a portion of the blank, the desired shape of the roof surface 12 may be different from a straight surface. For this purpose, the roof surface 12 may have a surface 12a that slopes towards the side edges, as shown in FIG. Face 12
a is a V-shape that stands upright on the head, and its tip is
In the central plane 11 of This configuration provides vertical guidance,
The generation of a lateral force acting transversely to the traveling direction 4 is reduced. A similar effect can be obtained by tilting the roof surface 12b towards the center plane 11, where the roof surface 12b forms an upright V-shape, whose base point lies in the center plane 11.

As shown in FIGS. 6 and 7, the leading edge 17 of the roof surface 12 has a shorter length 1 when measured transversely to the center surface 11 than the trailing edge. . In the figure, L is the length of the trailing edge. For this purpose, it is expedient for the roof surface 12 to have a notch 21 in the region of the preceding ridge 17. The notch 21 is provided on one longitudinal side 19 or the other longitudinal side 20 of the body 2. The notch 21 is expediently extended to the body 2 and can contribute to moving the chain link around the rivet axis 40 at a relatively large angle.

As shown in FIG. 8, in addition to the notch 21 provided at the leading edge 17 of the roof surface 12, the trailing edge 15
Also has a notch 22. Notches 21 and 22 are, in the illustrated embodiment, different longitudinal sides 19 and 2 of body 2.
0. Leading edge 1 on one longitudinal side 20
It is expedient to provide one notch 21, 22 in 7 and the trailing edge 15.

The ridge 15 on the cutting tooth side, that is, the trailing ridge 15 is provided with one notch 2 on each of the longitudinal sides 19 and 20 of the main body 2.
Advantageously, it has two. In this way, a support surface 32 is obtained which is adjacent to the trailing ridge 15, which is relatively narrow and corresponding to the width of the body 2. Only when the support surface 32 penetrates, for example, soft wood, the roof surface connected thereto becomes active.

In FIG. 9, the edge region 29 on the cutting tooth side is not upset, and forms a support surface 32 together with the end surface of the edge region on the side opposite to the main body 2. The width of this support surface 32 sufficiently corresponds to the width of the material thickness of the carrying strip or body 2. The roof surface 12 formed by upsetting, which precedes in the running direction 4, is wider than the support surface 32 in a direction transverse to the running direction 4, and is supported by contacting the cut tear bottom. Only after the surface 32 does it work. The support surface 32 is, as indicated by the dotted line in FIG. 9, re-ground so that it extends from the trailing edge 28 in the running direction 4 to the interior of the wider upset molded roof surface 12. It is curved. Thereby, good support is achieved even with a cutting link that has been post-ground many times.

In another embodiment of the invention, the width B of the roof surface 12 measured transversely to the running direction 4 varies, and in particular varies continuously. In the embodiment of FIG. 10, the roof surface 12 tapers from the width B of the preceding ridge 17 to the width d of the body, the width d of the body 2 corresponding to the material thickness of the body.
The roof surface 12 in FIG. 10 is advantageously inserted in the direction of travel indicated by the dashed arrow.

It is also expedient to construct the roof surface in the form of an "arrow" as shown in FIG.
At the front of the arrow-shaped roof surface 12. Of the body 2,
It is expedient for the front edge 26 in the running direction 4 to also end sharply so that the chips in the kerf are discharged laterally by the body 2 and the roof surface 12. The width of the roof surface 12 continuously increases to the width B of the trailing ridge 15 that follows.

[Brief description of the drawings]

FIG. 1 is a side view of a cutting link according to the present invention.

FIG. 2 is a plan view of the cutting link of FIG. 1;

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a cross-sectional view corresponding to FIG. 3 of another embodiment of the present invention.

FIG. 5 is a cross-sectional view corresponding to FIG. 3 of another embodiment of the present invention.

FIG. 6 is a plan view of the roof surface of the depth limiter with a notch at the leading edge on one longitudinal side.

FIG. 7 is a view corresponding to FIG. 6, in which a cutout is provided on another longitudinal side.

FIG. 8 is a view corresponding to FIGS. 6 and 7 in which notches are provided on a leading edge and a trailing edge on each longitudinal side of the main body.

FIG. 9 is a view corresponding to FIG. 8, in which notches are provided in trailing edges on both longitudinal sides of the main body.

FIG. 10 is a plan view of a roof surface tapering continuously from a preceding ridge to a following ridge.

FIG. 11 is a plan view of a roof surface continuously expanding from a leading edge to a trailing edge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting tooth 2 Cutting tooth main body 3 Riveted hole 4 Chain running direction 5 Main body part 8 Roof blade 9 Main body part 10 Depth limiting part 11 Main body surface 12 Roof surface 14 Upset formed material part (edge part) 15 Trailing edge of roof surface 17 Leading edge of roof surface 18 Projection 19,20 Long side of body 21,22 Notch 23 Pointed end 32 Support surface

Claims (10)

[Claims] A cutting link for a saw chain of a power chain saw, comprising a body (2), the body (2).
Is a rivet hole (3) for coupling with another chain link and a cutting tooth (6) formed in the body (2) and having a roof blade (8) and a side blade (7). Body part (5) rearward in the running direction (4) of the cutting link (1)
And a depth limiting portion (10) preceding the cutting tooth (6), the depth limiting portion (10).
Has a roof surface (12) provided on the side opposite to the main body (2) and inclined in the traveling direction (4), and has a roof surface (1).
2) has a leading edge (17) positioned transversely to the running direction (4) and a trailing edge (15) positioned transversely to the running direction (4), and has a cutting tooth. The trailing edge (15) adjacent to (6) is at a lower position than the roof blade (8), and the leading edge (17) of the roof surface (12) is higher than the trailing edge (15). A cutting link according to claim 1, characterized in that the roof surface (12) of the depth limit (10) is formed by the upset molded material part (14) of the chain link. 2. An upsetting material part (14) is formed on the front body part (9) of the body (2) of the cutting link (1) and is preferably substantially flat which is joined with the body (2). The cutting link according to claim 1, wherein the cutting link comprises a support strip. 3. The material portion is formed by a free edge portion (14) of the carrier strip on the side opposite the body (2), the carrier strip preferably being substantially of the body (2). 3. The cutting link according to claim 2, characterized in that it is in the plane (11). 4. The upset molded material part (14)
The projecting portion (14) of the upset molded portion (14) projects at least beyond the longitudinal side (19, 20) of the body (2), preferably over both longitudinal sides (19, 20) of the body (2). 4. The cutting link according to claim 1, wherein the lengths of the projections provided on the longitudinal sides are substantially equal. 5. A leading edge (17) of the roof surface (12).
Is measured transversely to the running direction (4),
2) The cutting link according to claim 1, wherein the length (l) is shorter than the trailing edge (15). 6. The roof surface (12) is formed substantially symmetrically with respect to the surface (11) of the body (2) in plan view, and is advantageously measured transversely to the direction of travel (4). 6. The cutting link according to claim 1, wherein the width (B) of the roof surface changes continuously. 7. The roof surface (12) has at least one notch (21, 22) in the area of the leading ridge (17) and / or the trailing ridge (15), 2
7. The cutting link according to claim 1, wherein 2) extends to the body (2). 8. The roof surface (12) is inclined towards one longitudinal side (19) of the body (2).
A cutting link according to any one of the preceding claims. 9. A method according to claim 1, wherein the leading edge (17) is formed as a point (23) and the edge (26) of the body (2) terminating at the point (23) ends in a pointed manner. A cutting link according to any one of the preceding claims, characterized in that it is a cutting link. 10. The part of the roof surface (12) acting as a support surface (32) corresponds to the material thickness (d) of the body (2) in a direction transverse to the running direction (4). A cutting link according to any one of the preceding claims, characterized in that it is a cutting link.