US69122A - Improvement in saw-mill head-blocks - Google Patents

Description

@with tant atrat @Hina DARIUS -PARKHURST, OF ST. LOUIS, MISSOURI.

v Letters Patent No. 69,122, dated September 24, 1867.

IMPROVEMENT IN SAW-MILL HEAD-BLOCKS.

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TO ALL WHOM I'I MAY GONCERN:

Be it known that I, DARIUs PARKHURST, of the city and county of St. Louis, and State of Missouri, have invented a new and useful Improvement in Saw-Mill Head-Blocks and Carriages; and I do herebydeclare that the following is a full and clear description thereof, reference being had to the accompanying drawings, and to the letters ofreference marked thereon.

'.Ihe object of this invention is to construct the headblocks of a saw-mill in such a manner that either one or both of them may be moved at the same time by means of a single actuating lever, thus giving to that class of hcad-blocks known as self-acting the increased advantage of being moved further on one end than on the other, and then alternating the adjustment, thereby permitting the operator to saw tapering lumber, such as l wheel-arms, wagon-tongues, fence-posts, and such other like tapering lumber. l

To enable those skilled in the art to make and use my improved head-block and carriage, I will proceedto -describe its construction and operation.

Figure 1 of the drawings is a side elevation of the improved carriage and head-block.

Figure 2 is a plan of the same.

Figure 3 is an end elevation of it.

Figure 4 is a sectional elevation ofthe end of one of the head-blocks, showing an application of a brake to it.

A is the carriage, and in its generalconstruction is not unlike other carriages used for similar purposes. The only improvement introduced in its construction is the plates a, which are securely fixed to its sides at such intervals as the tail-block B will be likely to occupy when changed for diiferent lengths of logs. The plates a, as clearly shown in iig. 2, are simply lat metallic plates, having notches `cut in their inner edges ofjust suicient size to receive the width of the head-blocks. When the block B is to be placed on thc carriage it will just be dropped into the notches thus prepared to receive it, and will thus be held securely in place on the carr riage. The head-blocks B B are each of them provided with the sliding rests C of the usual form. The bottom edges ot' these rests are'provided with cogs7 as seen in iig. 3. A pinion (not shown) in the central part of the head-block gears into and actuates the said rests either forward or backward, asmay be required. These pinions are located on the same shafts as the bevel-wheels D, and are actuated by them, and these wheels D are in turn actuated by the bevel-wheels Dl, which are located on the inner ends of the shafts DI", which have their bearings in the lugs ZJ, projecting from the sides of the head-blocks B B. There are levers E E iixed to the outer ends of the shafts D2, the positionsv of the said levers being vertical, or nearly vertical, and their upper ends terminating in handle pieces e e, while their lower ends extend downward a few inches, say six or eight, (more or less,) below theshafts D2, and are there provided with wrists eZ ef. A horizontal connecting-bar, F, connects the two wrists e2 e3 together, as shown in iig. 1 of the drawings. One single circular orifice for the wrist e2 is provided in the said connecting-bar, but a number of slotsf are made in the bottom` of the same for the reception of the wrist e3, the said slots f being disposed at intervals along the length of the said bar, the said intervals being arranged to suit the different locations of the block B. As is clearly shown in tig. 3, the lower ends of the leversE E arevdivided into two branches, between which are placed the cogged pinions G G, and also the ratchet-wheel g. The wheels Gr are securely xed to the axles or shafts D2, and the wheels G and the ratchet g are placed-on independent axles just above them,the latter axles inding their bearings in the two branches of the levers, and in such proximity to the shafts DL as to allow the cogs of G and G to gear into each other. There are double paw-ls I-I Il pivoted to the Outcrsides of the levers E E', as clearly shown in iig. I. The upper parts of these pawls arc provided with handles` 7L t, by means of which they may be thrown. y forward or backward at pleasdre, so as to gear into the ratchets g. When the said pawls are thrown into contact with the said ratchets on either side, and the lever E or E is operated forward or backward, as the case may be, the Contact so formed between the said pawl and ratchet will lock the wheels g Gr', so they cannot revolve on their axes, and the wheel Gwill thereby be compelled to turn, and with it thegcaring D D, and thus the sliding-rests C will be actuated either forward or backward, as may be desired. As each of the pawls H H may be thrown into gear with its ratchet, either forward or backward, or out of gear entirely, by placing the handle k or h parallel with the lever E or E, and as such contact of said pawls with their appropriate ratchets F and the forward and backward motion ofthe levers E E will cause motion to the aforesaid sliding rests C, either forward or backward, and furthermore, as the bottoms of the levers E E are connected together by means of the bar F, it follows that the operating of one of' the levers E or El, when both of the pawls are inv gear on the cor responding sides of their respective ratchets, will aetuate both of the slides C in harmony with nach other, and when only one of the said pawlsis in gear only one of tho said slides C will be set in motion. As the pawls may be readily sot in gear or out of gear by means of the hand-les 71, t, it is evident that this arrangement of head-blocks will be very convenient where tapering stuit` is to be saw-eil, and the whole arrangement et' the gearing is so simple and eiicient as to present much superiority over other head-block gearing non' in use. A grad# uatod disk, I, is attached to the outside of the lever E, and small pcrforations z' in its periphery mark the graduation points. Into these porforations a pin may be inserted at any pointldcsired, and when the said pin so inserted strikes the edge of the head-block it will stop the motion of the machinery, and the easy and rapid setting of the mill may be thus accomplished with great accuracy. It is the intention to place the perforations z'in such relative positions to each other as to indicate quarter inches for the motion of the slide C. The thickness of the stuft` sawed may' thus be ganged with great accuracy. A lever, L, pivotefl to the end of either et the head-blocks, has a turned-up end, which entersan annular groove, Z, out in the inner fece of the wheel G, and by pressing the said lever to one side or the other a brake will be applied to the said wheel. ,A cam, L', operated by a crank, Z, the said cam beinr: pivoted to the end of the head-block in close proximity fto the said lever, may be used for the purpose of applying the brake. i

One great advantage of the employment of the head-blocks of the foregoing description is in the facility that is aiforded ,for manufacturing lumber from springy logs', for by unshipping the pawl from its ratchet at either end, and reversing the motion at the other endoi' the carriage, the log at that end may be drawn back with the slide, provided that the log has been properly dogged.

Having described my invention, what I claim, is-

1. The combination of the levers E E', pawls 7L z, spur-gearings G G', shafts D2,bei'elgeari1igs D Dl, and head-blocks C C, arranged inthe manner described.

2. I claim the lever L, the cam L', with its crank Z', and the wheel Gr, when combined and arranged in tiie manner and for the purpose set forth.

DARIUS PARKIIURST.

Witnesses:

M. RANDOLPH, C11/is. H. Borrar

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