US 811769 A
Description (OCR text may contain errors)
H0. 811,769. PATENTES FEB. 6, 1908.
J. B. PBRBBS,
PLANBR HEAD. urmoumn mum JULY 5. 190a.
MT/VESSES: 0v van/ram W1 John 5. Frbes UNITED sTApns P rrENT OFFICE.
Specification of Letters IPatent.
Patented Feb. 6, 1906.
Application filed July 6, 1905. Serial No. 268,343.
To alZ whom it may concern.-
Be it known that I, J OHN B. Fonnns, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Planer- Heads and Knives, of which the following is a s ecification. a n the use of revolving cutter-heads in wood-planers it is necessary that the blade or bit he rigidly secured between the cap and head to hold its cutting edge in perfect alincment and prevent it from being driven back by the rapid and forcible blows it receives by coming in contact with the material upon which it is being operated.
By the use of my invention the bit is so firmly and correctly held that the out made by it is of a uniform depth, and as it is worn down b the necessary grindings it can be gradual y advanced to project beyond the cad to do its work and yet be always held as rigidly as it was when new.
In the accompanying drawings, in which thesame reference-numeral indicates a corresponding art in each of the views in which it occurs, igure 1 is a perspective view of one end of a planer-head without the clampingbolt. Fig. 2 is a transverse vertical section of the same. Fig. 3 is a broken view similar to Fig. 1 with the cap removed. 1
Re rrin more particularly to the drawings, 1 in icates t e ordinary planer-head, which is preferably provided with the usual guide stop or pin 2.
3 is the bit or cutter,wl1ich is held in position with its front edge projecting beyond the head by the cap 4 and a bolt which screws into the recess 5. Located between the es and the head to the rear of the bit is a bloc or stop 6, which is adapted to en age with the rear ed e of the blade or hit an prevents its bei riven back by the blow or impact whic it receives when its front edge engages with the material being acted u on The under side of the rear e go of the ca is provided with shoulders to engage with corresponding shoulders on the rear portion of the block 6. B recessing the cap and block longitudinal y the shoulders form ridges or corrugations 7, which referably extend from end to end and in a inement with the axis of the head, so that the block is always held perfectly true, and by making the front wall of each of the recesses of the ca and the rear wall of those in the bloc straight or at right angles to the flat faces of the cap and block, respectively, a very secure construction is secured, although both faces of the recesses can be inclined, if desired. The rear edge of the block is preferably made thicker where the recesses are formed, as shown at 8, to prevent its being weakened thereby, and the cap is correspondingly recessed, as shown at 9, to ermit of the cap resting flat upon the bla e and the block. The forward edge of the bl0Cl(,WlllCl1 is of the same thickness as the bit, is recessed or cut away, as shown at 10, to avoid engaging with the clamping-belt and at 11 to avoid engaging with the pin 2.
As the cutting edge of the bit is worn away from use and grinding the desired amount of projection is secured by moving the bit forward the distance of one or more corrugations, the recess 9 bein of sufficient width to permit of moving the block 6 forward until the bit is suhstanti ally worn out.
In using my invention the bit or cutter is clamped between the ca and head in the usua manner, with a su cient portion projecting to engage with the material to be 0perated upon. The rear ed e of the bit abuts against the forward edge 0% the block or support and is thereby rigidly held against displacement, for with the block interlocked with the cap by means of the corrugations the bit cannot move without the movement of the cap. in case there should be any inequality in the projecting portion of the blade caused by uneven grinding, as by one end projecting farther than the other, it can be readil adjusted by turning the cap, to other wit the bit and block, at an an is to t e head. This movement is possible y reason of the enlarged opening or slot 19 in the cap and the openings 10 and 11 in the supports.
The bit is rigidly held a ainst backward movement by a plurality 0 steps or shoulders, which act positively at any and all adjustments of the bit. As the invention can be used with the ordinary head by making the change in the ca and the support, the invention can be readr y applied to planers new in use at a very small cost, and thereby secure the advantages of a positively-locked planer-bit.
The bit can be readily removed by simply loosening the cap without having to take it off entirely, as must be done with a broad perforated bit, and the bit upon either side of the head can be removed without loosen ing the one upon the other side, thereby rendering it more convenient for the purpose of repairs, as for regrindin one bit in case it should be dulled by striking an object that is not struck by the other bit.
Having described my invention, I claim 1. In a planer-head, a cap, the rear edge of which is recessed longitudinally upon its under surface and shouldered, and a support for engaging with the bit and holding it in position, the rear edge of the support being thicker than the forward edge and provided with shoulders for engaging with the shoulders of the 011p.
2. n combination with a planer-head, a cap having a recess in its rear edge, means for securin the cap to the head, a bit held between t 1e forward parts of said cap and head and a block held between the rear parts of said parts so that the bit will abut against the forward edge thereof, said block having a thickened rear part adapted to engage with the recessed part of the ca said thickened part and the recessed part eing corrugated, the corrugations engagin with each other.
In testimony whereof Iiave affixed my signature, in presence of two witnesses, this 23d day of June, 1905.
JOHN B. FORBES. Witnesses: W. S. BOYD, M. R. SEELY-