Woodworking – Slicer – Rotary disk
Patent
1999-01-06
2000-05-02
Bray, W. Donald
Woodworking
Slicer
Rotary disk
1441621, 144373, 241 92, 2412921, 241298, B27C 710, B02C 1818
Patent
active
060560304
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a knife disc arrangement of a disc chipper, whereby several knives are mounted on a rotating knife disc, said knives extending from the center portion of the disc towards the outer edge of the disc, and wear plates are mounted on the sectors between the knives, and whereby the knives are supported against the rotating direction of the disc by arranging the base edge of the knife against a supporting surface, and the wear plate is supported in its position by means of a supporting strip fastened to the disc. The invention also concerns a hinge strip of a wear plate of a disc chipper, said hinge strip supporting the wear plate of the disc chipper in its position and having a counter surface for supporting the wear plate and being shaped as a part of a cylindrical surface.
The invention concerns manufacturing and construction of a wear plate for a disc chipper generally used.
Wear plates consisting of a massive solid part in a sector between two sequential knives are generally used in traditional, old disc chippers. This kind of a wear plate is described, e.g., in patent publication FI 79799. Wear plates are usually provided with a hard plating sintered on the wearing surface after the basic machining. The wear plates have, in addition, a prominent projecting part for maintaining the plate in position when the chipping forces tend to move it. Due to the aforementioned facts, the plates must be manufactured of thick plate blanks, a considerable part of which will be removed by machining. The massive material as well as the machining, sintering and the second machining phase after the heat treatment make the wear plate expensive and a slow part to produce.
A knife disc arrangement according to the present invention is characterized in that the supporting surface supporting the base edge of the knife is located in said strip, by means of which the wear plate is supported in its position. A hinge strip of the wear plate in accordance with the invention is characterized in that the hinge strip has a projecting part which can be fitted against a groove in the knife disc and which has a supporting surface, against which the base edge of the knife can be fitted.
By means of the present invention, the characteristics of a wear plate are improved and, simultaneously, the production costs of the wear plate are decreased. In the construction according to the invention, a strip is mounted under a separate, evenly thick wear plate, said strip keeping the wear plate in the right position, forming thus the supporting surface of the knife and being supported by the supporting surface of a groove in the knife disc and forming an adjustable hinge of the wear plate.
A wear plate according to the invention can be made of hard, temper hardened steel, over 300 Hb, having a high yield point and being difficult to machine.
The arrangement can be used for spare part deliveries for existing, old knife discs, where the groove required by the arrangement already exists in the knife disc.
The invention and its details will be described in more detail in the following, with reference to the enclosed drawings, wherein
FIG. 1 illustrates one quarter of a chipper disc, viewed from the cutting side,
FIG. 2 illustrates a prior art wear plate provided with a hinge joint, as section A--A of FIG. 1, in a larger scale,
FIG. 3 illustrates a wear plate and a hinge strip in accordance with the invention.
The body 1 of the chipper's knife disc is mounted on a rotating shaft 2. Arrow N shows the disc's direction of rotation in FIG. 1. Several knives 3 are mounted on the disc and extend from the central part of the disc towards the outer periphery of the disc. The knives have straight cutting edge lines all in the same plane, perpendicular to the disc shaft. The direction of the knives may differ from the radial direction so that the outer ends of the knives will move foremost or rearmost as the disc is rotating. The sectors between the knives are covered in major part with inclined wear plates 4, fastened to the knife disc
REFERENCES:
patent: 4503893 (1985-03-01), Demopoulos
patent: 4685497 (1987-08-01), Mierau et al.
patent: 5129437 (1992-07-01), Nettles et al.
patent: 5287901 (1994-02-01), Matthews
patent: 5857508 (1999-01-01), Jonkka
Bray W. Donald
Sunds Defibrator Woodhandling Oy
LandOfFree
Blade disk arrangement for a disk chipper and a hinge strip of a does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Blade disk arrangement for a disk chipper and a hinge strip of a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Blade disk arrangement for a disk chipper and a hinge strip of a will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1586263