US3123A - Self-settistg head and tail blocks eor sawmills - Google Patents

Description

LEVI SHEALD, OF BART-LETT, OHIO.

SELF-SETTING HEAD Ann TAIL` BLOCKS'FOR sAwMILLsl specification of Letters Patent NO laiee,'dated-ames,184e.

To all fav/wm @'25 may concern.'

4Be it known that I, LEVI HEALD, of Bart-V lett, in the count-y of Washingtonand State of Ohio, have invented a new and useful Manner of Constructing Head and Tail Blocks of Sawmills, by which They are Rendered Self-Setting; and I do herebyd'eclareV that the vfollowing is a full and `exact description thereof. 1

'Ihe main body of my .head or tail block :is formed Vin the usual way, but Ythe part upon which the ends ofthe log rest is peculiar in its construction, being composed of t-hree principal pieces. Two of these pieces, which may beV of two-inch vplank,fare

placed edgewise, rest-ing on the sides of the carriage, within the main block, and form by their combination a bearing of four inches for the log; and upon these is laid the third Y piece of timber which may also be of twoinch plank, and be :tour inches wide; this latterV piece forms the actual bearing for Vthe log, being placed flatwise upon the -two former; to this uppermost piece the dogs which are to hold the log in place are attached. The two pieces of plank first named do not, when the log is being sawed, .stand at precisely the same height'from the car-V riage, the outermost piece, or that which is immediately against the main block being a little, say a fourth of an inch, lower than the innermost piece, so that, at the time of sawing, the weight of the log is actually borne by the latter. In the act of backing the carriage, the outermost of the two pieces of plank is raised up by means of inclined planes placed on the floor of the sawmill, which operate upon a strip hinged to its lower edge, and which allows the carriage to pass in one direction without raising said pieces. 'Vhen the log is raised so as to bea-r its whole weight on the outermost pieces of plank, t-he innermost pieces are forced endwise by the action of a spring, and are thus brought up against a gage duly set to the thickness of the stuff and these pieces rise, at the same time up aninclined plane at each end. Then the hinged pieces on the outermost bearing blocks are liberated from the inclined planes on the floor of the mill,

the weight of the log resting on the inner-V most pieces, they slide down their inclined planes, are brought up against a shoulder on the carriage, and the setting of the log is thereby completed.

y In the accompanying drawings, Figure l,

islatop view ofra-sawf'mill floor andcarriage with a part of their appurtenances.A A, A, are the carriage sides.; yB, the tail block;

C, C, the wayson which 'the carriage runs.Y

The headblock-is not shown, as its construction, so -far as my improvement 1s concerned,

`i-s 4,the `same ywith that of the -tail block.

D,D,D,AD., are pieces of timber fastened to l.theifloor of Vthe mill, .and `constituting inclined planes forfraising the log when it is ,-to be set `for a fresh cut. At -the'head block end thereare two pair ofthese,asthe parts concerned in raisingand settingthe log have `to v'be 4divided into two, iadmitting the .saw Ybetween them. `E,is theoutermost,.and F, the innermost yof the ipieces of two-inch plank -upon which the end of .the logis to rest.

4`Gr, fisfa gpiece of plank four inches wide, which isrto be placed on vthe top of the pieces E, H, H, Vrepresent the dogs driven into Vthis .piece; a, a, a, are vpoint-s driven into the vupper side-of :the piece F,

which, entering Ainto the under side oit-the piece-G, obviate all tendency'tolthe slipping of the logupon it. j

"Fig 3, is a vertical section of the :saw carriage in the line of junction between the planks E, and F. Y y 'j Fig. 4, is a similar section in front of the plank F.

Fig. 5, is a longitudinal, vertical section of the carriage and floor, in the line b, b, of Fig. l.v The plank E, is connected to the head block B, by bolts c, held by staples (l, cl; recesses e, e, being cut in the head block to admit said bolts when the plank E, is made to rise. D, D, are inclined planes which serve to raise the plank E; but in the position in which the tail block B, is represented, which is that in which the loghas just been set, the hinged piece I, would pass over the inclined planes D, without raising said plank; and in like manner similary pieces attached to'the head block (but not represented), would pass over the inclined planes D. The inclined planes D, are made adjustable on the floor to adapt them to the length of the log. The lower edge of the plank F, I cut in the general form shown in Fig. 4; the parts e, e, constitute inclined planes which are received into notches in the .upper side of the carriage, and it will be apparent that were this plank slipped laterally in the direction of the arrow, its tendency would be to resume its present position 'vvere' a Weight, as that of a log, to be brought dovvnupon it; this, it Will present-ly appear, is one of the principal elements in my mode of setting the log. The parts f, f, also form two inclined planes against Which projecting pins g, g, are brought into contact When the plank E, is made to rise; these pins serve to lift the inclines e', e', clear of their bearings on the saw carriage, and ren, der itA easy. to move thepiece E, laterally, when required. v v i 1/ v J, Fig. 1,'is a gage, having set screws, to determine the setting of the log.

K, is a spring, which may be of Wood, and bearsuponone end of the plank F, inv order to move it laterally against the gage J,- When thevveight of the log is removed.

- From the foregoing Vdescription of the respective parts, themanner of setting the log will be readily understood. Whena cutl has been made, and the lcarriage Yis being backed, the hinged pieces I, on the lower edges of the plank E,constituting posts to the head and 'tail blocks, are brought intov action on the inclined planes D, D, by` Which` the log is-raised, say to the height of an inch, or more, above the plank F, which is conse-v quently* freed' from `its pressure, and said,

plank is then forced endwise-by the spring K, againstfthe gage'J. Whenthe log de-' scends, its Whole bearing -is transferred to; the plank F, through 'the intermedium of@ the dog plank G, and the plank F, 'carrying the log, Will then descend the inclined planes: e', e', until brought up bythe shoulder e, which lwill completel the operation of settino'.r f IIaving thus, fully described the construction and operation of my self-setting saW mill, what I claim therein as new, and desire i to secure by Letters Patent, is lflhey manner herein set forth latter against the gage, inthe manner, and i for the purpose, set forth; andsso that the Weight vof the llog `When again brought to bear uponY the piece F, shall complete the setting, by the action of the inclined vplanes e", e.

in which* I have arranged the movable parts of the rdofnot Claim. either of the individual parts above described When taken separately and alone; but I do claimto have invented a new combinationand arrangement of the respective comblnation and arrangement vof therespective parts concerned in the render-V ing the setting of a log on the saw-mill selfacting, which is new and distinctive in its character; and I therefore claim the said arrangement under any of the modifications Y' of which it is susceptible, While the same remains substantially as described, in` its mode of act1on.` Y

Witnesses: ,v THos. PfJoNns, i

EDWIN L. BRUNDAGE.

character is preserved, andthe instrument Y

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