US863505A - Wood-planing machine. - Google Patents

Description

No. 863,505. PATENTED AUG.13, 1907.

I. J. BUDLONG,

WOOD PLANING MACHINE.

urmouzon FILED um. 11. 1908.

2 SHEETS-SHEET 1.

UNITED sTATEs MACHINERY COMPANY, VANIA.

PATEN'I OFFICE.

WOOD WORKING A CORPORATION OF PENNSYL ASSIGNOR TO AMERICAN NEW YORK,

WOOD -PLANING MACHINE.

Specification. 01: Letters Patent.

Patented Aug. 13, 1907.

Application filed b'eptember 11, 1906. Serial No. 334,088.

To all whom it may concern:

Be it known that I, IRVING J. BUDLONG, of Aurora, county of Kane, and State of Illinois, a citizen of the United States, have invented a new and useful Improvement in WoodPlaning Machines, of which the following is a specification.

My invention relates to means for holding down the lumber while being acted on by rotary surfacing cutters, and it consists principally in applying yielding sections to the pressure plate or bed which retains the stock in position while being planed, and also to certain devices in connection therewith.

In the drawings Figure l is a sectional side elevation of my invention shown as applied to the lower cylinder of a double surface planer. Fig. 2 is a front elevation and Fig. 3 is a sectional view showing a modification of its construction.

A Fig 1 represents a planing cylinder with the usual chip breaker a, pressure bar b, and bed plate 0.

B is an under cylinder with its accompanying timber supports 0, d, before and after the out.

D is a pressure plate or overbed which is intended to hold the lumber down against the supports 0, and cl, and prevent it from vibrating as the knives act on it. This overbed is made adjustable vertically so that it can be set accurately to the thickness of the material by means of screws 0, e, operated by hand, either independently as shown in Fig. 2, or together by means of a connecting shaft and two pairs of bevel gears as is common in planing machines.

The above described mechanism is not new, being in general use on machines of this character: but it is to an improved form of overbed D, that my invention relates.

In the planing of many kinds of stock, such as fiooring from valuable woods, there is considerable loss from imperfect and irregular sawing of the boards, so that at certain points the upper cylinder fails to dress them down to a true surface leaving low spots of greater or less area that are not touched by the knives: when these low places come under the overbed the cutting action of the cylinder causes the board to vi-' brate and thus leaves a rough, wavy surface at that point: the result is that the board becomes a cull and is either classed low in the inspection or is thrown out to be cut up. To obviate this loss I provide the overbed D, with sections f, which are loosely fitted into recesses formed across the under side of the overbed leaving ribs g, of any desired width, but preferably less than the width of the sections f, which normally project below the overbed substantially as represented in Fig. 2. To the top of these sections I attach one or more guiding and retaining studs h, which pass upward through recesses in the bosses j, attached to the overbed D: the studs h, are shouldered down as at It, to receive strong spring Z, and above the springs I provide hollow screws m, threaded into the bosses j, and bored centrally to receive the upper portion of the studs h loosely: nuts n, are threaded on to the studs above the hollow screws.

It will be seen that the hollow screws can be adjusted to increase or decrease the tension of the springs, and consequently the pressure on the sections f, and that by means of the nuts n, on the studs the sections f, may be raised or lowered independently of the springs and screws m, so as to adjust the sections to any required level below the surface of the overbed.

A modification of my device is shown in Fig. 3, in which weights are used instead of springs to press the sections against the board H in this case the studs 0, with attached nuts, may be used to limit the drop of the sections f.

The operation of my device is as follows: When the boards H, pass from the top cylinder A, they enter under the overbed D, with its elastic sections f, which are thus lifted slightly and a strong pressure is exerted -by the springs Z and by the ribs g, sufiicient to hold the lumber down upon the bars 0, d, against the action of the knives on the lower cylinder: When a low spot occurs on the top surface from causes before mentioned, the shoes or sections f, drop into it and thus continue the pressure of the springs as before. Meantime the low spot in the surface passes and the normal surface of the board again comes in contact with the ribs 9. As a consequence no roughness or waviness develops in the action of the lower cylinder: on account of the fact that the lower surface of the boards is in this case really the top surface when laid in a building, the inequalities of the surface first planed are not considered, and the board thus passes inspection.

I have shown my invention as applied to a planing machine adapted to run the lumber with the finished surface down; but it can be also applied to a machine running the finished surface up, by a reversal in position of the overbed D, and its elastic sections with relation to the cylinders; t'. e., it can be adapted to operate under the upper cylinder in a similar manner as shown in connection with the lower cylinder, but in this case it is necessary to locate the finishing cylinder last in the order of cutting.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In combination with a lower planing cylinder and its bed plate, a sectional pressure plate or overbed consisting of alternate rigid and elastic sections, the latter being arranged to drop somewhat below the line of the rigid sections, operating substantially as set forth The combination in a planing machine, of a top su1' facing cutter-followed by an undersurfacing cutter, and with a bed plate over the under surfacing cutter, said plate being provided with alternate elastic sections and rigid sections, the former or both of which may press upon the lumber being worked.

3. The combination in a planing machine, of a top sunfacing cutter followed by an under surfacing cutter, and with a bed plate over the under surfacing cutter, said plate being provided with alternate elastic sections and rigid sections, the elastic sections normally extending below the rigid sections.

IRVING J. BUDLONG.

Witnesses E. C. KELONGE, H. J. WEBB.

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