USRE9078E - hubbell - Google Patents

Description

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.J. HUBBBLL;

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N.PETER5, FHOTDLIHOGRAPNER, WASHINGTON, D C.

UNITED STATES PATENT OFFICE.

IJQSEPH HUBBELL, OF DAYTON, OHIO,.ASMSIGNOR TO EDWARD P. ALLIS.

H EA D'- BLOC K Fonv SAW-M ILLS.

SPECIFICATION forming part of Reissued Letters Patent No. 9,078, dated February 17, 1880.

Original No. 95,904, dated October 19, 1869. Application for Reissue iled January 20, 1880.

To all whom t mag/'conceww Be it known that I, JosErH HUBBELL, or Dayton, in the county of Montgomery and State oi" Ohio, have invented certain newv and useful Improvements in Head-Blocks for Saw- Mills; and l do hereby declare that the following is a full, clear, and exact description of the invention, that will enable others skilled in the art to which it appertains-to make and use the same, reference being had to theaccompanyingdrawings,and to the letters of reference marked thereon, which form a part of this specification.

It is the object of my invention to so constructthe mechanism foroperatin g head-blocks for saw-mills that the material to be sawed shall be moved Withcertainty andrapidity the distance desired, and so that, in so moving the said material, the actuating mechanism shall be moved by each vibration of the actuatinglever, and so that the jacks or kneeswhich move the material may be disen gaged from theA propelling mechanism to admit of their reverse movement being more rapidly eEected.

The improvements to be claimedwill hereinafter fullyr appear.

In-the accompanying drawings my inven tion is illustrated as followsr:-Figure 1 is a plan view of a saw-mill carriage having my improvements applied thereto.- Fig. 2 is avieW in elevation of the same, looking toward the saw-line. Fig. 3 is a vertical transverse section on the line a: w in Fig. 1. Fig. etais alike section, ou an enlarged scale, on the line y y in Fig. 1, showing the pawlretracting device.

Fig. 5 is a similar view to Fig.2, on an enlarged` scale, and showing only one kneeand'its ad vancingmechanism. broken away, so as to show parts beyond, as in Fig. 2 the hand-Wheel F is shown bydotted lines at the right hand of the figure, and in Fig. 5 it is also shown in dotted lines.

The construction and operation of my'device are as follows, reference bein-g had to the drawings, and to the letters of referencemarked thereon:

A represents the timbers of the carriage. B B' are the blocks which are slotted and recessed, as shown 1n Figs. l, 2, and 5. C C are the knees or feeding-j acks, which are' grooved and adapted to operate in the slots and recesses Figs. 2 and 5 show parts`lv the pinions G on the screw-shaft. also constructed with an ge-ratchets, as shown in Figs. 2'and 5, the teeth of the ratchets beof thevblocks,as seen in Figs. Zand 5. D is a threaded socket or screw-nut attachedto each of the knees, and lies within the recess of the block,when it engages with a screw-shaft, E, which lies longitudinal with the blocks Within'said recesses, and is supported by suitable bearings, and is provided on the outerend with a hand-wheel, F, andat a point within the block with a cog-pinion, G.

When the knee is to be advanced the screw is operated by mechanism which connects with the gear Gr, and when it isto bereceded it is operated by the hand-wheel. 1t is also operated by the handwheel when it is desired to set the knees tov receive a new log, if said knees are receded too far; but the screw and the hand-wheel form no essential part of my invention, and are not new in the place and for the mirposes show-n.

The essential part of my invention in this Y particular consists in the construction and op eration -of the mechanism which operates the knee when settingthe log toward the saw.

Thefeatnres ofsnch a mechanism, and which I attain byr my construction, are, first, a firm, steady movement of the knee, which movement'is to be derived from a quick, sharp, vibrating movementoi` the setting-lever 5 second, a movement of the knees by each movement of the setting-lever.

Devices have been heretofore constructed bywhich this latter end has been accomplished,

.broken away in Fig. 2,) have their shafts secured in bearings in brackets I I I I', fastcned lto and extending laterally from the headblocks. Thesey drivingWheelsH H gearinto ing on the inside of the ianiges.- The pawls which'aet upon these ratch-ets are supported on concentric carriers, which. are operated by bein g connecte-d with the actuatin g mechanism by connecting-rods.

J J J" J' are the concentric pawl-carriers. They are collared loosely to the ratchet or drive wheel shaft by sleevesj j, which are cast They are IOO with the pawl-carricrs J, &c. The pawls are marked ll', and are what are known as springplunger pawls, and work in openings in arms lo 7c', extending from the pawl-carriers J, Ste. In the movement of the machine these pawls oscillate toward and from each other and act alternately upon the ratchet. They are operated as follows: Along the front of the carriage is a rod, O, which is made to vibrate longitudin'f'tlly by means ot' a pivoted lever, I?. (See Figs. 2 and 5.) On the rod O, at the proper points, are placed standards, studs, or bracketsN. To these are pivoted connecting-rods M, which are connected by pivots to the pawl-carriers. As the lever ID is vihrated the pawl-carriers are made to oseillate toward and from each other and operate the pawls upon the ratchets. 'The action of the pawls upon the ratehets is alternate, and hence the movement of the ratchet is continuous.

I am aware t-hat a device has been heretofore constructed which had a vibrating' lever,

a longitudinally-vibrating bar, to which were attached -two pawls that were long enough to reach onto and engage with a double ratchet on the screw-shaft, and which, as the lever was vibrated, alternately operated the said screwshaft by means of the double ratchet, said double ratchet having its teeth pointing in opposite directions. I therefore do not desire to claim or include as part of my invention such a device.

Where the pawls which act upon Ache ratchets connect directlyT with the vibrating bar or other device for moving them which is not concentric with the ratchet, they necessarily have a very limited sweep or traverse upon the ratchet, and their action upon the teeth at the extremes of their traverse is too uncertain and too liable to slip unless the teeth of the ratchet are made very large, which is not desirable where fine or minute settings are required; but when the pawls are carried on concentric carriers therelation of the pawl is the same to all the teeth of the ratchet over which it traverses, and hence the teeth may be as tine as desired, and hence the most minute settings can be-accomplished, and the pawls can have as much traverse on the ratchet to each vibration of the lever as the connections will allow, and the pawls will engage `as firmly with the last tooth of the traverse as with those on the top ofthe ratchet.

-. Consequently, when proper connections are employed, the knees of the head-block may be made to traverse a comparatively wide space at vone sweep or vibration ofthe settinglever, which is very desirable, as quick work in sawing thick stuff is attainable.

In order to quickly reverse the knee by such mechanism as may be provided therefor, it is necessary that the pawls may be quickly disengaged from the ratchet, so as to permit of .its reverse movement. My device therefor is illustrated in Fig. 4, and consists of a cupcam, K, which slides on the shaft of the wheel II and en gages with feet Z2, which extend from the lower ends ot' the pawls l. The cup-cam is operated by a push-rod, L, which passes through the bracket I in a rod-sleeve, L.

A recess on one side of each opening in the brackets for the push-rods admits of' a pin on each rod-sleeve L passing through the 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.

By this device either wheel may be disengaged from the pawls, so as to move only one end ot' the material to be sawed. When the pawls are thus disengaged the knee can be receded by revolving the screw-shaft by means of the hand-wheels F F.

What I claim as new is as follows:

l. The combination, within the setting mechanism of a saw-mill head-block, of a ratchet device which is operated upon by two pawls, which are respectively attached to carriers which are pivoted concentric with said ratchet, and are operated by heilig connected with an actuating-lever in a manner substantially as shown, whereby the said pawls, as the actuating-lever is moved, shall oscillate toward and from each other alternately, and thereby alternately engage with said ratchet, for the purposes mentioned.

2. The combination, within a saw-mill headblock, of a shaft from which the knee is actuated, a ratchet device for actuating said shaft, which consists of a ratchet-wheel, two concentric pawl-carriers, to which are respectively attached spring-pawls for engaging the said ratchet, and connectingrod for connecting said carriers with an actuating mechanism which, as it is operated, will cause the said pawls to alternately engage with the said ratchet, substantially as set forth.

3. In a saw-mill head-block which has a ratchet device which consists of a ratchetwheel, concentric pawl-carriers, and springpawls, the combination therewith ot' a cam which engages with said pawls and withdraws them from the ratchet, substantially as set forth, and for the purposes mentioned.

4. In a saw-mill head-block in which the knees are advanced by screw-shafts, the combination therewith of a ratchet-wheel, concentric pawl-carriers with spring-pawls, rods connecting said carriers with an oscillating bar or pitman, and an actuating-lever for oscillatin g said bar, all constructed and arranged to operate substantially as and for the purposes mentioned.

In testimony that I claim the foregoing I have hereunto set my hand this 23d day of December, 1879.

JOSEPH HUBBELL.

Witnesses: JN0. K. HALLocK, E. D. BEsToR.

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