FI60341B - ANORDNING FOER KAPNING AV TRAED - Google Patents

Description

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jSSjBj [B] (11) UTLÄGGNINGSSKRIFT 60341 • C / ^ jPatent granted on 11 01 1932

Patent meddelat ^ (51) K ».ik.Wci.3 A 01 G 23/08 SUOM l - FI N LAND (21) Pat« nttlh »k * (nus - Pat« ntan «eknlng 772127 (22) H» k * ml »ptlvl - Ansöknlngtdag 06.07 · 77 '' (23) Alkuplivi— GUtighetsdag 06.07.77 (41) Has become slipped - Bllvlt offencllt 07.01.79

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Patent- oeh registerstyrelsen v 1 Antokin utligd ° ch utUkrift.n pubikund 30.09.8l (32) (33) (31) Requested «toikcus — B« flrd prlorittt (71) (72) Patrick James Crawford, 1013 South Lincoln Street, Shawano , Wisconsin 5 ^ 166, USA (US) (7 * 0 Berggren Oy Ab (5i) Wood cutting device - Anordning för kapning av Trad

The invention relates to a wood-cutting device with two mirror-like cutting pliers with a cutting edge, which can be moved in a clamp-like manner towards each other, each of which is mounted so as to be pivotable, the cutting blades being in the same cutting plane and pushing tightly against each other at the end of cutting operation.

In previously known wood cutting devices, the blade has operated with a substantially compressive force to cut the wood from the stump, and this requires a relatively large hydraulic cylinder and high hydraulic pressure as well as a relatively thick blade to cut the wood. Such cutting results in the destruction of a considerable amount of fiber, extending from the cut to both sides of it, which in many cases renders the wood unusable in sawmills.

In previous cutting devices, the blades have been either straight, which causes the device to work in a cutting and roughing manner, or arcuate, whereby the blades overlap in the cutting operation with respect to each other. In the latter case, the blades cannot protrude tightly against each other at the end of the cutting operation.

The invention eliminates these drawbacks. The invention is characterized in that the cutting edge of each cutting blade consists of a straight cutting part and an associated convex cutting part, and that the convex cutting parts are arranged relative to the cutting blade pivot bearings so that the protruding straight cutting parts, when the cutting blades are further turned against each other, come into cutting contact on the tree trunk.

The blades of the cutting device according to the invention thus protrude against each other along their rectilinear parts and provide a combination of knife-like cutting and pressing which saves the wood fibers and which cutting operation continues throughout the movement of the blades through the wood. The straight cutting edges of the blades meet each other directly at the ends when the wood is completely cut. With this cutting operation of the blades, very little destruction of the wood fibers occurs in and near the cut. Thus, due to this cutting operation, less hydraulic pressure is required, allowing for thin blades and a smaller size and weight of the entire unit.

The cutting device in question is easy to apply to trees of different sizes by simply making it of different lengths.

The drawings show one embodiment of the invention:

Figure 1 is a side view of a cutting device according to the invention with its support and gripping devices.

Figure 2 is a view similar to Figure 1, but with the tree shown in a truncated and removed state.

Figure 3 is a top view of the cutting device cut substantially along line 3-3 of Figure 1 and the cutting blades in a fully open position.

60341

Figure 4 is a front view of the device of Figure 3.

Figure 5 is a sectional view taken along line 5-5 of Figure 3.

Figure 6 is a sectional view taken along line 6-6 of Figure 3.

Figure 7 is a view taken along line 7-7 of Figure 6.

Figure 8 is a top view of the cutting device with the top plate removed and the blades in a partially closed and cutting position.

Figure 9 is a view similar to Figure 8, but with the blades in the fully closed position.

In the drawings, the cutting device A comprises a bottom support plate 14 with a recess 16. The recess comprises parallel side edges 13 and 15 terminating in a semicircular inner part 18, cf. in particular Figures 8 and 9. Further, the device is provided with a lower flange 20 which tapers upwards from the base plate 14.

The flange 20 is welded at its lower edge to the plate 14 from the edge of the recess 16. The upper edge of the flange 20 forms the blade guide as described below.

A rectangular rear recess 23 is formed in the top support plate 22, and the plate is spaced from the base plate 14. The top and bottom support plates are rigidly connected by side plate portions 24 and 26, back plate portions 28 and 30, and a triangular inner support 31. A recess is formed in the top plate 22. set side edges 25 and 27 terminating in a semicircular inner portion 29. The recess 32 is substantially on the recess 16 of the lower plate 14.

Extending upwardly from the top panel 22 is a wood guide 36 formed of side panels 38 and 40 connected to oblique panels 42 and 44 connected to the end panel 46. The top flange 48 is semicircular in shape and attached to the top panel 22 below it. It is supported by the top plate and also aligned with the recess 32. The lower edge of the flange 48 is spaced from the upper edge of the flange 20, which distance is only slightly greater than the thickness of the blades described below, and thus forms a blade guide to which we return later.

The device has two cutting blades 50 and 52, which are similar. The blade 50 will be described in detail below, 60341 and the same parts of the blade 52 have the same reference numerals, but with the footnote a. The blade 50 comprises a straight base edge 53 terminating in a second straight edge 54, the outer end of which terminates directly in a cutting edge portion 56 54. The straight cutting edge portion 56 terminates in a convex, arcuate cutting edge portion 58, and the portion 58 terminates directly in the edge portion 60. The straight cutting edge 56 is tangential to the arcuate, convex cutting edge 58. The entire cutting edge extends substantially from point y to edge x. A relatively short arm 62 is formed at the end of the edge portion 60.

Attached to the blade 50 and extending therethrough is a protrusion 64, cf. in particular Figure 6, and a sleeve 66 is attached to the top plate 22. A corresponding sleeve 68 is attached to the base plate 14, and a pin 70 secured to the protrusion 64 and the sleeves 66 and 68 by a nut 71 has a blade 50 pivotally mounted on the top and bottom plates 22 and 14 and between flanges 48 and 20.

The blade 50 is made of two parts 50 ^ and 502 * see. in particular Figure 6. Part 5Ο2 is a thinner material than part 50 ^. The parts 50 ^ and 5Ο2 are fastened together by means of bolts B provided with nuts on the elongate plates Pa and Pb. Since the blade parts overlap under the plates Pa and Pb, they are provided with a spacer 49 to compensate for the difference in thickness of the plate parts, cf. in particular Figure 6. The blade part 502 *, which is cheaper than the part 50 ^, can be removed and replaced when worn.

The arm 62 is pivotally attached by a pin 72 to the piston 74 of a conventional self-supporting and double-acting hydraulic member 76 which is maintained in operation by a conventional hydraulic device. The member 76 is pivotally attached by a pin 78 to the shank 62a of the cutting blade 52. The cutting blade 52 is pivotally mounted on the pin 80 in the same manner as the blade 50 is mounted on the pin 70.

Thus, by using the hydraulic member 76, the cutting blades are brought together for cutting operation or separated from each other. The self-supporting type member 76 provides pressure to the blades to cut the wood, regardless of its shape or position relative to the blades. The base plate 14 is reinforced at the pivot pins 70 and 80 by plates 79 and 81.

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The blade 50 has an upwardly directed retaining flange 82 formed on the edge 54, and together with the second retaining flange 82a they hold the cut wood on top of the blades together with the conventional gripping members G and Ga of the column M on the boom D. in particular Figures 2, 8 and 9. The post M is attached to a pair of spaced apart plates 83 fixed to the upper support plate 22.

Further, the device is provided with a stop 84 attached to the side portion 24 and forming an extension thereto. The stop limits the blade 50 to the fully open position. A similar stop 84a is attached to and extends to the side portion 26 and defines a fully open position of the blade 52a, cf. in particular Figure 3. Stops 84 and 84a center the blades in a fully open position.

When the blades 50 and 52 are moved from the open position of Figure 3 to the closed and fully cutting position of Figure 9, they move in substantially the same plane by means of the flanges 20 and 48, cf. in particular Figure 4, due to the proximity of the opposite edges of the flanges to the blades as they pass between the flanges. As a result, the blades do not move in the direction of the causes of the wood, but cut the wood at right angles as desired. The convex, cutting edge portion of the blades first penetrates the wood and the subsequent straight cutting edge portions, and the wood T is prevented from moving by forcing the wood against the semicircular inner edges of the flanges 20 and 48. When the convex cutting edge first penetrates the wood and is followed by a straight cutting edge, the cutting of the wood is carried out with the least possible force on the blades and very little damage to the wood fibers.

Further, the cutting edges 56 and 58 of the blades, respectively. 56a and 58a, due to their shape and their pivoting movement, the blades have a continuous and progressive slicing operation as they pass through the wood as opposed to a compression type blade cut which can damage wood fibers up to 15-20 cm from the base of the wood. The operation of the blades according to the invention causes very little damage to the fibers at the base of the wood, which is particularly important in wood which is cut into sawn timber as well as in wood which is cut into pulpwood.

Claims (6)

60341 A wood-cutting device with two mirror-shaped cutting clamps (50, 52) with a cutting edge, which can be moved in a clamp-like manner, each of which is mounted so as to be pivotable, the cutting blades being in the same cutting plane and pushing tightly against each other at the end of the cutting operation. the cutting edge of each cutting blade (50, 52) consists of a rectilinear cutting portion (56, 56a) and an associated convex cutting portion (58, 58a), and that the convex cutting portions (58, 58a) are fitted to the rotating bearings of the cutting blades (70, 80 ) so that they are directly opposite each other at the beginning of the cutting operation and can be placed on the tree trunk before cutting, at the end of the cutting operation the straight cutting portions (56, 56a) projecting tightly against each other when the cutting blades are further turned against each other come into cutting contact. Device according to Claim 1, characterized in that the pivot bearing of each cutting blade (50, 52) has pivot pins (70, 80) which are spaced apart. Device according to Claim 1 or 2, characterized in that the rectilinear cutting part (56, 56a) is tangential to the associated convex cutting part (58, 58a). Device according to claims 1-3, characterized in that it comprises means (20, 48) for guiding the cutting blades (50, 52) as they pivot about the pivot bearings (70, 80). 1. Arrangement for the manufacture of a combination of spark plugs, the head of which is provided with a plunger (50, 52); the end of the conveyor belt (50, 52a) and the convex end of the conveyor belt (58, 58a) and the convex end of the conveyor belt (58, 58a); ) to the Federal Republic of Germany (70, 80)