USRE4625E - Improvement in head-blocks - Google Patents

Description

EDWARD H. STEARNS.

.lmprovement in Head Blbcks.

N0. 4 625 42,801! Reissued Nov. 7,1871.

EDWARD l-l. STEARNS.

improvement in Head Biocks.

Reissued Nov- 7,1871.

Wiin 6,5,3 8,3

UNITED To all whom it ma concern: I

Be it known that I, Enwmi') H. STEARNS, of Erie, in the county of Erie, in the State of Pennvania, have invented certain Improvements in in is a specification:

'e object of this invention is to improve the head-blocks of saw-mills and it consists: First, in the means employed for automatically throwing back the knees of a head-block, after a log has been successively set forward to the saw and has been sawed into lumber, to a position to receive another log, and be in like manner set tranverselyto the saw. Second, in a mechanism for stopping or limiting the backward movement of the knees to accord with the size or diameter of the logs to be sawed. Third, in the means employed for avoiding sudden jars and concussion at the termination of such backward movement of the knees. Fourth, in the construction and arrangement of devices, whereby the device for stopping or limitingthe backward movement of the knees is connected with two or more headblocks having the stop-devices that are operated in the same carriage, so that the stop movement can be simultaneously operated upon in all the blocks on the carriage by a single lever and stop all the knees at the same distance from the sawline. Fifth in the construction of a device by which the (fogs, that hold the 10 in contact with the knees, after being liberated om the remnant of the sawed log will automatically adjust themselves out of the way, so that they will not interfere with the backward movement of the knees or anything or mechanism pertaining to the head block, and will always be in a position most conivenient to be grasped for the dogging of another In the drawing, Figure 1 is'a plan or top view of a carriage with two head-blocks thereon and the improvements attached; Fig. 2, an end view of same; and Fig. 3 is a transverse vertical section of the same taken in the line a; m, Fig. 1.

In the accompanying drawing, A represents the longitudinal sides of a log-carriage. B B are the two knee-guides of the head-block, placed transversely upon the carriage A, G G are the upright knees, connected to or cast with the slides D D, which are fitted in the guides in such a manner that they may move freely back andforth thereon. The knees 0 C may be set forward Head-Blocks for Saw-Mflls, of which the follow-' E WARD n. s'rEARNs, 0F ERIE, PENNSYLVANIA.

MPR'ovEMsn'r m HEAD-BLOCKS,

Specification forming part of LetterePatent No. 81,837, dated September 1, 1868; reissue No. 4,625, dated November 7 1871. I

with the log by any suitableineans; but the de vice best calculated for such purpose was patented by me April 15, 1856. G isa shaft, which has its hearings in the guides B and in lugs b b attached to the carriage-sides A; This shaft has a pulley, H, keyed on said shaft near each block, and attached to each of these pulleys is a chain, I, which chains are connected to the slides D D by means of arms I and temper-screw I, as seen in Figs. 1 and 3. On and around shaft G are spiral springs J J, which are wound around said shaft, connected at one end to the pulleys H H, the opposite or inner ends to the bearin gs or lugs 11 b that support the central or that part of shaft G intermediate between the head-blocks. These springs, when thekn ees (J G are being moved forward or the log set to the saw, are being wound up or coiled as the operation of setting the knees to the saw carries with them the end of chain I, which, beingpreviously wound around pulleys H, causes the pulleys and shaft to revolve within the springs, while that end of the spring that is attached to thelugs b cannot revolve; consequently the power of the springs is thus obtained and any time when the slides D D are liberated from the means which moved them and the knees forward to set the log to the saw the springs J J will be free to unwind themselves, and will draw the slides and knees instantly back to any point at which they maybe stopped. a, In order to liberate the slides from the means that set them forward, shafts KK,with cams on their ends, are employed to throw the pawls out of gear with the rack on the under side-of the slides but-other means could, of course, be employed, having a different mechanism for setting the log to the saw, or for forcing that mechanism out of gear with the racks.

I do not confine myself to thepulleys and chains for forming a connection between the slides and springs J, as a rack and pinion and various other means may answer for the same purpose, as can be suggested by those skilled in the art neither do I confine myself to spiral springs 5', for coiled spriu gs may be used, as well as other springs; but the spiral spring is preferred By this construction and arrangement of parts all hand-work or manipulation of any kind is avoided in the drawing back of the slides and knees, thereby saving: both time and'labor. Another advantage is, either one of the knees may be ada vanced separately or independently of the other,

. notches on the cam.

"or both may be instantly brought backinto line can be raised or lowered to a greater or less height in order to present the propernotch against which the knees are to bestopped in their backward movement. M M are notched eccentrics or cams attached one at each end of longitudinal shaft N, which vibrates in bearings on the knee-guides in such position that a lug,r,,that projects from the outer sides of lever L will rest in any one of the The segment-bars L may be and areraised and lowered to a. greater or less height by means of the notched eccentric cams M on the shaft N and hand-lever 0, attached at any convenient point on said. shaft N. When the cams M are so adjusted as to admit ofthe notches on bars L to be below the surface of the guides the knees can be brought back their extreme distance, as the stop or projecting arm P attached to the knees comes in contact with therear notch or shoulder 01 on the segment-bar L; but when the forward end of the segment-barsL are raised so-as to bring an advanced notch above the guides,.the arm P will strike against it and arrest a further backward movement of the knees, and the more the forward end of bars L are raised the less backward movement of the knees will be had. Hence the backward movement of the knees may be regulated to agree with the diameter of the log next to be sawed, and from the same position or stand-point that the setting-lever is operated.

By the construction and arrangement of the contrivances above described for moving the knees of the head-blocks on the carriage toward or from the saw-line the attendant is enabled to control such movements and stop the knees at anypoint desired from the saw-line from a single stand-point, thus saving much time, securing greater accuracy, and with less care than if each knee was separately manipulated or operated upon. In order to avoid jars or concussions when the projecting stop I? strikes against a notch on bar L, a buffer is interposed between the arm 0- and any notch on bar L that it strikes against, which buffer is composed of spring n and plate f and bolt 9. The metal plate f strikes against the notch, and the spring a, which may be of rubber or other material, is interposed between the plate f and arm 0, while bolt g goes entirely through the arm 0, spring at, and into or through plate f,- but preferably the bolt 9 goes through and slides freely in holes in both the arms and spring at, and has a screw-thread cut on its rear end, and is screwed into plate f, and has a head on its forward end.

By this construction a good and efficient buffer-stop for the knees is obtained, effectually obviating all jars or concussion of the parts, preventing unnecessary wear of parts. Q Q are the holding-dogs, which are constructed in the usual orany proper manner, the inner ends of which are hooked in a swivel or eyebolt, R, fitted in sockets S on the upper surfaces of the slides D D. The socket S,instead of being of equal height jecting flange, T, on'the inner sides of the socket S, and has concave upper edges, as shown in Fig. 3 at i, so that when a dog is freed or raised tact with the flange T, slide to the center of the concave '5 in the upper edge of the flange, and in so doing .will assume a position at right angles with the knee-guides and parallel with the sides of the log-carriage, as seen. in Fig. 1, and thus and without danger of obstructing the knees in the part of thesawyer is required in order to effeet that end. Independent of the setting desimultaneously arresting or stopping at, any deof two or more head-blocks on the same carriage by connecting the stopping devices with a mechanism that will cause such device, whether one or many head-blocks, to simultaneously act to stop each knee of a series of head-blocks at an the labor much greater, for theattendants had to operate the devices for stopping such backward movement upon each head-block separately, requiring time and care to accomplish.

Having thus described my invention, I claim as new and desire to secure by Letters Patentment of springs, so applied that when theknees are released from the setting mechanism the springs will automatically force the knees back to therequired position for the next advancing movement, substantially as set forth.

and applied in the manner shown, or in any equivalent way, for the purpose of limiting the backward movement of the knees, as set forth.

3. The projecting arm 0 on knee O,in combination with the notched segment-bar L, or equivalent devices for stopping the backward movement of the knee, in the manner and for the purpose described. Y

4. The shaft N, notched cams M in combination with segment-bar L having lug r, in

mann er and for the purpose described.

with the segment-bar L, in the manner and for the purpose described.

6. The shaft G, pulley H, spring J, and chain block, in the manner and for the purpose described.

two head-blocks with their knees GO, slides D D, and their actuating devices,the notched cams M, and segment-bars L, one on each head-block, in combination with thesingle extended shaftN alpd lever O, in the manner and for the purpose s own.

throw thepawls out of gear with the rack, in combination with the shaft G, pulley H, chain I,

all around,is constructed with anupwardly-pro- .from a log and drops it will, in coming in conbe automaticallyv adjusted out of the way of all E or any of the working parts of the head-blocks,

their backwardmovement; and no attention on' vices, no provision has heretofore been made for sired point the backward movement of the knees equal distance-from the saw-line, which has made 1. In head-blocks for saw-mills, the employ- 2. The segment-bars L, constructed, arranged,

the V 5. The elastic buffer-stop P, composed of arm 7 e, spring a, plate f, and bolt 9, in combination I,-in combination with the knee 0 of a .h'ead- 7. The supporting knee-guides B B and B B of Q 8. The shaft K having a cam on its endto I it out of contact with the rack on the slide, a device for causing the knee to make a backward movement, and a device for stopping the backward movement at any desired point, construct ed and arranged to operate in the manner substantially as described.

and knee 0, in the manner and for the purpose described.

9. The flanges T on sockets S, for the purpose of carrying and adjusting the dogs Q when they are disengaged from the log, substantially as described.

10. The head-block herein described, lia 'iru E. H. STEARN S. attachedtheretc and operating therewith a meat; 3r es: anisin for setting the knee toward the saw, a de- J. A. LOW'NDES, vice for unlocking that mechanism and forcing GHABLEs CHINN. (130)

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