US274366A

US274366A - Daeius paekhuest

Info

Publication number: US274366A
Authority: US
Publication date: 1883-03-20
Anticipated expiration: 1900-03-20

Description

(Rd Model.)

' D. PARKHURST.

Y HEAD BLOCK. No. 274,366. Patented Max-20,1883.

N. rzisnykmmm amn Washingmn, uc.

' Unrrnn STATES twice,

DARIUS PARKHURS'I, OF SI; LOUIS, MISSOURI, ASSIGNOR OF QNE-HALF TO GEORGE E. KNIGHT, OF SAME PLACE.

HEAD-BLOCK.

SPECIFICATION forming part of Letters Patent No, 274,366, dated March 20, 1883.

Application filed December 5, 1882. (No model.)

To all whom it may concern Be it known that I, DARIUS PARKHURST, of the city of St. Louis, in the State of Missouri. have invented a certain new and useful Improvement in Head-Blocks for Saw- Mills, of which the following is a full, clear, and exact description, reference-bein g had to the accompanying drawings, forming part of this specification, and in which Figure 1 is a top view. Fig. 2 is a side elevation. Fig. 3 is an enlarged top view, and Fig. 4 is a detail view of a modification.

I have shown my invention applied to the head-block for which patent issued to myself and assignee April 25, 1882; but it may he applied to any head-block.

Myinvention consistsin features of noveltypointed out in the claims.

Referring to the drawings, A represents th main shaft, and B the counter-shaft, on the latter of which are the operating parts of the set-works. The shafts are journ aled in a suitable frame, 0. As my present invention does knees-that is to say, if the wheel is turnednntil the figure 2 comes to the position figure l had occupied, the knees will have moved back one inch.

F is a finger or pointer, secured by one end 4 to the frame 0 or to any other suitable object, the other end of which works in the groove E as the wheel turns. Th us, when the finger is at the numeral 1, the knees are one inch back from the saws, and so on. I prefer using a spring-finger which would be rigidly secured to the frame, the spring allowing the finger to remain in the spiral groove as the wheel turns; but instead of the finger springing it may he so secured'to the frame or other I object as to move, allowing it to remain in 0 the groove of the wheel. The groove maybe marked oil into sections of greater or less distance than that shown and described, if desired.

In Fig. at is shown a modification of the wheel D, wherein it consists of a band cast upon or secured'to the arms of the fly-wheel G on the end of the shaft 13. I have made the wheel of such a size that one revolution indicates eight inches movement of the knees, as the figures will show; but this size is not essential. I

The operation is as follows: Supposing the last cut of a log has been made, the next thing, of course, to be done is to run the knees 6-5 back to allow the next log to be rolled onto the carriage against the knees. The sawyer, by glancing at the log, can ascertain very closely its-diameter. He then runs the knees back until the desired number on the wheel D comes to the fingeras, for instance, if he judges the log to betwo feet in diameter, he turns the wheel D until the numeral 24 came to the finger, or, it he wanted to take, say,

a. three-inch slab off the log, he would stop the wheel at the numeral21, and soon; or, instead of the sawyer or operator guessing at the size of the log, its exact diameter may have been ascertained by measuring.

Instead of the wheel l) having the spiral 8o groove E, it may have a spiral rib, when the end of the finger F would have a notch to fit over the rib,and the same result would he had.

I am' aware that head-blocks have been pro vided with an indicator-wheel having aspiral groove, and a sliding rod carrying an indicater-finger working in said groove has been before known.

I claim as my invention--- l. The spring-pointer secured to the main 0 frame, in combination with a spirally-grooved indicatorwheel of a head-block for saw-mills, as set forth.

2. In a headblock for saw-mills, a Wheel secured to the o 'ierating-shaft of the set-works 5 and provided with a spiral groove and scale, in combination with a stationary spring finger or pointer arranged to follow in the groove of the wheel, substantially as and for the purto the. frame A and. its other end working in pose set forth. the groove E of the wheel D, substantially as 3. In a head-block for saw-mills, the combiand for the purpose set forth. nation of frame A, shaft B, wheel D, secured DARIUS PARKHURST. 5 to the shaft B, and having a circumferential Witnesses:

spiral groove, E, and a suitable scale, and the G. B. TIRRELL, spring finger or pointer F, secured by one end A; L. GBOGKER;