US95904A - Improvement in head-blocks of saw-mills - Google Patents

Description

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Letters Patent No. 95,904, dated October 19, 1869 IMPROVEMENT IN HEAD-BLOCKS OF SAW-MILLS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom tt ymay concernv Be it known that I, J osnPH HUBBELL, of Zanesville, in the county of Muskingum, and State of Ohio,

' have invented certain new and useful Improvements in Head-Blocks for Saw-Mills, of which the following is a full, clear, and exact description. i

It is the object of my invention to so construct the mechanism for operating bead-blocks for saw-mills7 that the material to be sawed shall be moved `with certainty and rapidity the distance desired, and so that the jacks for moving the material may quickly be disengaged from their propelling-mechanism' to admit of their movements being reversed; and

The improvements herein claimed consist,

First, in the combination of a pitman, a vibrating. lever for operating the pitmau, and impartinwthereto a reciprocating movement in its guides, pawls, or spring-clutches, operated by means of the pitman through link-comieetions, a ratchet-wheel, with which the pawls engage,a pinion, a worm-shaft, and a feeding-jack, the clutches being so arrangedin pairs, and connected with and operated bythe pitman, as to impart a continuous movement to' the ratchet-wheel, when desired, by the vibrations of the lever, as hereinafter set forth.

Second, in the combination, with the ratchet-Wheel, of the spring-parvis or ratchet, constructed as hereinafter set forth.

Third, in the combination of the spring-parvis or ratchet-clutches, and a retractor, having an inclined bearing-surface to retract the clutches, by pressing` upon their feet or short projections,as hereinafter set forth.

Fourth,in the combination of a double pitman or reciprocating bar, pawls, or spring-clutches, linked to this bar, cogged wheels, with interval ratchet-teeth, screw-shafts secured in the head-blocks, and carrying pinions corresponding with the oog-wheels, lscrew'- sockets, or nuts, and feeding jacks, to which the sockets or n'uts are'att-ached, as hereinafter set forth.

In the accompanying drawing- Figure 1 represents a plan or top view of a carriage, having my improvements applied thereto;

Figure 2, a view, in elevation, of the' carriage, as seen from the rear;

Figure 3, a vertical transverse section through the same, at the line :c x of iig. l; and

Figure 4, a sectional view, on an enlarged scale, at the line y y of fig. l, showing the pawl-retracting devices..

A represents the timbers composing an ordinary carriage, traversed in any well-known and suitable way.

Upon this carriage are secured, in a suitable 'manner, two slotted or recessed blocks or frames B In each block is secured a feeding-jack or knee, C C', so as to slide endwise, but be prevented from moving vertically, as shown fully in tig. 2.

Upon the under side or each knee orjack is firmly fastened a threaded socket or screw-nut, D, through each of which is passed a screw or worm-shaft, E E,

secured in suitable bearings in the blocks B B', and

each having secured upon its outer' end a crankwheclF F', the latter being shown in dotted lines in iig. 2.

'By turning the crank-wheels F F-, the feeding-jacks may be propelled either toward or from the operator.

A small spur-pinion, GG, is fastened to each shaft E E, near its outer bearing e c.

Two large spur driving-wheels H H' (a portion of the outer `side of the latter being shown, as broken away, in fig. 2) have their shafts secured in bearings in bracket-s II I I', fastened to the head-blocks.

These driving-wheels have ratchet-teeth on their outer faces, as shown in fig, 2.

An annular slightly-projecting ridge or rim, fi, is, in this instance, formed upon each wheel, of `less diameter than the wheel, and the ratchet-teeth' made upon separate rims to fit upon the ridges t', in such manner as to bring the peripheries of the ratchet-rims flush, when in'place upon the wheel, with the teeth upon the oog-wheels, and allow the ratchet-rims to project outward, sidewise, from the wheels. But the ratchetteethmay be cast with the wheels'if desired.

Upon theishaft of each driving-wheel is a loose collar or sleeve, jj, carrying or being cast with pawlholders or guides J J J" J', each formed of a main4 piece, with two studs orshort arms, It t, projecting from it ucar the top and bottom.

vThese arms have holes in them, to form guides' for the pawls lll, which are protruded, and causedto engage the ra'tohets, by springs bearing against pins upon the pawls, and upon the lower' arms or studs of the guides or holders.

Each pawl has a short projection or foot, Il, upon its lower end, as shown in figs.' l and 4.

The pawls or clutches are disengaged or retracted by a reti-actor, lr, on each wheel-shaft. (See tig. 4.)

Ihe retractors may be caused to slide upon. their shafts, by the push-rods L sliding through the outer brackets I I', and attached to the retractors k.

The inclined inner sides of the retracting-slides K draw down the pawls l1, by sliding upon the feet l).

A recess on one side of each opening in the brackets for the push-rods, admits of a pin on each -rod-sleeve Il passing through thc opening, and after the'pins have passed, with the rods and their casings or sleeves, through these openings, by turning the sleeves, the pins prevent'the rods from retracting, and lock down the pawls.

'lo each pawl-holder or guide is pivoted one end of a link, M, the other ends of these links being pinjointed to a bracket or adjustable short standard, N, secured upon a rod, O.

A lever, l), is fulerumed on an arm or support, 1), projecting from the framing A.

rlhe upper end of the lever moves ina guide, Q, also secured by its support to the framing.

The movements of the lever may be regulated by stop-pins in the guide.

rlhe lever is forked, and its arms pass, one on each side of the bar O, to which the lever is connected by a link, R, and short standard or adjustable bracket S.

The bar O passes through holes in a guide-plate, T, beneathv each head-block, (one being shown in fig. 3,) and is reciprocated in its guides by the vibrations ofthe level' P, the forked end of which also serves as a guide and brace for the central part of this reciprocating bar or pitman O.

The-operation is as follows:

The pawls being in contact with the ratchets of the driving-wheels, a movement of the lever in either direction slides the pitman O, and causes one pawl or clutch of each wheel to act and the other to slide over the teeth of the ratchets, and upon the reverse movement of the lever, the action of the pawls is changedf The two that before slipped over the teeth, now engage them to rotate the wheels, and the others slip.

A continuous rotation is thus imparted to the Wheels.

while the lever is vibrate-d.

rlhe driving-wheels mesh with and rotate the pinions G G, which revolve the shafts E E, and these move the nuts D, and consequently, the feeding jacks. Either wheel may be disengaged from the pawls alone, so as to move one end of the material to be sawed more than the other.

The jacks likewise may be moved, by revolving the wheels F F', by the crank-pins f f.

When the jacks are 'to be moved back, the sliding reti-actors k are shoved in upon the feet lz, of the pawls, either by the push-rods or other suitable shipping devices, which are thus disengaged from the ratchet-teeth ofthe driving-wheels. The crank-wheels are then revolved to the right until the jacks have been moved the desired distance.

That I'claim as myinvention, and desire to secure by Letters Patent, is-

l. The combination of the vibrating hand-lever, the reciprocating pitman, the spring-clutches linked to and operated by the pitman, the ratchet-teeth on the driving-wheels, the pinion, theworm-shaft, and the jacks, al1 these parts being constructed Yas set forth.

2. The combination of the driving-wheels, the reciprocating pawls moving parallel to the face of the wheels, the springs, and the vibrating pawl-holders, all constructed as set forth.

3. The combination of the pawl-holders, the springpawls, each having a short projection or foot, F, and the retractor k, all constructed as set forth.

4. The combination of tbe reciprocating sliding bar, pawis, or spring-clutches, connected by links with the bar, cogged driving-wheels, having internal ratchetteeth, screw or worm-shafts, secured in the headblocks, and carrying pinions corresponding with and driven by the eogged wheels, screw-sockets or nuts, in which the shafts turn, and feeding-jacks, slidingin the head-blocks, and to which the sockets or nuts are secured, the combination being and operating substantially as set forth.

In testimony whereof, I have hereunto subscribed my name.

JGSEPH HUBBELL.

'itnesses:

J CHN GILBERT, J. GLnssNnR.

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