US1706310A - Sawmill dog - Google Patents

Description

March 1.9, 1929. 4w. 'NEWSQM 1,706,310

sAwMILL 150G Filed v4April 18, 1927 allons, f

Patented Mar. 19, 1929.

WILLARD NEWSOM, F MONTGOMERY, ALABAMA.

sAwivriLL Doe.

Application filed Aprii '18, i927. Serial No. 184,774.

The present invention relates to saw mill dogs and more particularly those of the kind shown, and described in my prior patent 1,641,900, Sept. 6, 1927, and the primary object of the invention is to provide a dog which is stronger in its construction and has a less number of parts, and which embodies y simplified and improved means for locking,

releasing and adjusting it whereby these l0 operations may be accomplished with greater speed and facility. i

To these and other ends, the invention consists in certain improvements and combinations and arrangements of parts all as will be hereinafter described, the features of novelty being pointed out particularly in the claims at the end of this specification.

In the accompanying drawing z- Fig. 1 is a side View of a portion of a saw mill carriage equipped with a dog constructed in accordance with the present invention.

Fig. 2 represents a section taken on the line 2--2 of Fig. 1, and looking toward the left in that figure.

Fig. 3 represents a section taken on the line of Fig. 1 and looking toward the left.

Fig. 4.1'epiesents a cross section taken along the line 4 4 of Fig. 1 and looking downwardly.

Figs. 5 and 6 are elevations and Fig. 'i' vis a top plan view of the wedges `employed to clamp or lock the dog in different adjusted positions. i

Similar parts are designatedby the same reference characters in the same figures.

It will be understood that dogs embodying vthe present invention may be applied to or used in connection with saw mills of different kinds, these dogs being adapted to be secured to the appropriate sides of the knees of the head-blocks usually employed on the reciprocatory carriages of vsaw mills, the dogs having bits which are adapted to en- `gage the log or timber and secure it on the carriage in properposition to be operated upon by the saw. While the preferred enibodiment of the present invention is shown in the accompanying drawing and will be hereinafter described in detail .it will be understood that the invention is not restricted to the precise construction shown as equivalent .constructions will be included within the scope of the claims. n

Int-he present instance 1 represents a portion of a liead-block of the reciprocatory carriage of a saw mill and 2 Arepresents a lportion ofone of the knees, a pair of these knees being usually employed and provided withy means for adjusting them transversely vof the carriage toadvance the log, marked X iorthe successive cuts therethrough by the saw while the log rests on and is reciprocated longitudinally with the carriage.

' rThe dogs which serve to secure the log or timber in position on the carriage each com` prises, according to the present invention as shown iii the accompanying drawing, a slide 3 which is solid or unsplit and is bored or otherwise adapted to lit closely but slidably on a vertical bar 4. The slide is formed kwith slots 5 at its diametrically opposite sides, these slots being of a size to slidably receive the shank 6 of a dog bit 7, the latter having a sharpened portion which is usually directed downwardly and is adapted to bite into a log, such as the log X resting on the carriage and thus hold the 'log firmly and immovably thereon. The opposite end of the dog` bit may bev formed into a handle 8 to facilitate adjustment of the bit in a forward and rearward direction to conform wiith the position of the log prior to the engagement of the bit therewith. The vertical bar 4 is formed with slots 9 which are arranged diametrically therein or in the opposite sides thereof, and these slots extend continuously from the upper portion to the bottom or lower end of the bar. These slots 9,in the bar 4 aline with the slots 5 in the 'slide 3 and they are of a width to permit the shank 6 of the dog bit to extend through them.

they being in the shape of segments of a cylinder in the present instance to conform with the substantially cylindrical interior of the bar. The inner sides of the blocks have surfaces 11 which are parallel or substantially so and are spaced apart suficiently to accommodate the shank 6 of the dog` bit between them, while these blocks have sur- .tacos 12 which are beyond or are continuations of the surfaces 11, the surfaces 12 being convergent or inclined toward the lower ends ot' the opposed blocks, as will be clear from Fig. 6. These blocks are contained within the vertical diametrically slottedbar 4 and within theslide 3 which lits around the exterior of said bar. rllhe blocks are retained in relatively opposed workin},l relation by pins 18 which are lined in one et the blocks and slidably engage the other block so that while relative displacement of the blocks longitudinally is prevented by these pins, the blocks may relatively approach or separate in a transverse direction.

Nhile the blocks 10 occupy a position where the shank 6 ot the dog bit lies between the parallel surfaces 11, the dog` bit is notclamped or gripped by the blocks and hence the dog bitmay then be adjusted in a forward or rearward direction to conform with the position ot the log or timber, and while'the blocks 10 are in such position, the slide 3 may be freely adjusted vertically on the bar 4. However, when ther blocks 10 are raised relatively to the dog bit and the slide 3, the convergent or inclined surfaces 12 of the blocks come into engagement with and grip the lower edges of the shank 6 of the dog,` bit, and when these blocks 10 have been shifted upwardly to a suilicient extent, the reaction upon the blocks 10, due to the riding,` otl the convergent surfaces 12 thereon against the lower edges ot theshanks of the dog bit will spread or torce apart the blocks and the blocks will thus expand or spread apart the opposite sides ofthe bar 4 which are separated by the slots 9, and the consequentcxpansion of the bar 4 within the solid or unsplit slide 3 in conjunction with the bearing ot the outer sides of the blocks 1() against the inner sides ot the bar will produce suilicient friction to securely hold the slide against vertical movement on the bar. Downward movement of the blocks 10 relatively to thedog` bit will remove the convergent surfaces 12 on the blocks from engagement with the shank of the bit and will bring the parallel surfaces 11 opposite to the shank of the bit, the blocks being thereby permitted to move inwardly or t0- ward one another and this relative collapsing` movement of the blocks permits the bar 4 to contract, whereby the grip between it and the slide 3 is released. llrom the foregoing it will be clear that the simple upward displacement of the blocks performs the dual function of locking the dog` bit against torward or rearward movement and locking` the slide against vertical movement on the bar and a simple downward displacement ot the blocks releases both the dog; bit and the slide for readjustments thereof. y

The present invention provides means for shifting the blocksinto locking and releasing` position which means also serves as a handle for the vertical adjustment of the slide on the upright bar. Furthermore, the shifting means ier the blocks acts to hold the blocks in locking` position until and unless released by the operator. Such means comprises preferably a lever 14 which extends through a recess 15 formed in one side of the slide 8` and has a linger 16 on' its inner end which extends through one of theslots 9 in the bar 4 and restsin thespace between the blocks 1() and between the pins 13 which connect the blocks. This lever is pivoted to theI slide 3 by a pin or bolt 17 which eX- tendsthrough the slide and across therecess `15 therein, and a portion ot this lever eX- tends rearwardly from the dog` and is provided with a handle 18 which is in the form et' a knob or weight.l The weight of the knob 18 is such that it will normally force the .linger 16 upwardly against the upper pin 13 connected to the blocks 10 with a force which tends to shift ther blocks toward a position where they will lock the dog bit againstorward or rearward movement and lock the slide against vertical movement on the upright bar, but when the knob 18 is lifted by the operator, the finger 16 will actv on the lower pin 13 connecting the blocks 10 and will torce these blocks downwardly until the dog bit and slide are released.

While the knob 18 is supported by the operator, the dog bit is free to be adjusted in a forward or rearward direction, and also the slide may be freelyraised or lowered on the bar 4, the knob 18 and lever 14 serving as a handle by which the slide is raised or lowered, and while the knob 18 and the slide are supported by the operator, the dog' bit and slide will be maintained in unlocked position. Howeveig'when the operator releases his grasp upon the knob 18, the slide will drop until the dog` bit engages theA log andthe weight oi the knob will act to rock the lever 14 about its lulcrum 17 and thereby cause the finger 16 to act on the blocks to shift them toward locking position, a relatively slight pressure of the hand of the operator on the knob being` suiiicient to inure firm locking ot the slide and the dog lt will be understood that thebar 4 which carries the slide 3 and the dogl bit is maintained on a side ot the knee of the headblock so that the bar may be reciprocated vertically to a sutlieient extent to grip, and release the log or timber. ln the present `insta-nce this bar is shown fitted to slide vertically in a bracket 19 'which is bolted or otherwise liXed to a side oiz the knee 2,r and an eccentric 20 is rotatably mounted on the upper portionof the bar 4 and arranged to act on the upper and lower laterally project- 'ing portions 21 and 22 ot the bracket to raise or lowerl the bar 4- in consequence oli-otation of the eccentric 20, the bracket and eccentric just described corresponding with that shown in my prior application hereinbeliore referred to. Alsol a lower dog bit 23 y may be provided to engage the logor timber and thus assist the upper dog bit in holding the log in position onithe carriage. This lower dog bit may be pivoted at 2e 'to the lower end oi' the bracket 19` and its shank may extend through the diametrically opposite slots 9 in the bar 4 near the lower end of the latter', the shank of the bit may be provided with a slot 25 to receive a bolt 26 which extends through the lower portion of the bar el, the construction being such that the upward movement ot' the bar l which. disengages the upper dog 'from the log will simultaneously swing the lov-Fer dog downwardly out or engagement with the log, and when the bar l is lowered to bring the upper dog into engagement with the log the lower dog will be swung upwardly into engagement with the log or timber, this lower dog corresponding in construction and operation to that shown'and described in my prior application hereinbelorc referred to,

rlhe expansion of the sides of the vertically-slotted upright bar against the solid slide lirmly secures the slide against movement on said bar, the forcing outwardly of the wedge-blocks against the inner sides of the bar aiding in holding the slide against ,movemenn and at the same time the dog bit is firmly held against forward or rearward movement. As such locking ot the slide and dog` bit are pr'oducedl by the downward swing oi" the'lever and unlocking of these parts is effected by the upward swing ol' this lever, it willbe appreciated that the desired adjustments of the slide and dog bit, incident to the placing or shitting or' the log or timber on the carriage, may be made quickly and with Yfacility. rllhe weight on the locking lever acts in a direction to swing this lever' into locking position and to hold it in such position, thus requiring but little effort on the part of theA operator to force it into locking posit-ion, and as this lever is pivotally connectedto the slide which carries the dog bit, the lever may be used as a handle for raising and lowering the slide, as upward movement of the knob on this lever', incident to raising of the slide automatically unlocks the slide so that it may be'raised freely by an upward pull on the knob, and the slide may be lowered while supported by the hand of the operator on the knob, and when the slide is dropped the dog bit enters the log, and the locking lever' may then be forced into locking position by slight'pressure applied to the knob thereon.

l claim as my invention 1. A saw mill dog comprising a. transversely expansible supporting bar, a slide movable vertically on'said bar, and wedge means operating to expand the bar within the slide and thereby securely hold the slide and bar against relative movement.

2. A saw mill dog comprising a transversely expansible supporting bar, a slide movable vertically on the exterior thereof, a dog bit, and complemental wedge means operative to clamp the dog bit between them and vto expand the bar within the slide and thereby' secure together the dog bit, the slide and the bar. n

3. A saw mill dog comprising a supporting bar having a slot extending vertically therein', a slide movable vertically on said bar, a dog bit carried by said slide, and means for spreading apart the portions or' the bar at opposite sides of the slot therein .vithinthe slide to securethe bar anc. slide against relative movement.

v fl. A saw mill dog comprising a supporting bar having a slot extending vertically therein, a slide movable vertically on said bar, a dog bit movable with the slide and extending through'the slot in said bar, and wedge means operative to expand; the portions ot the bar at opposite sides olf the slot therein within said slide and thereby secure said parts against relative movement.

5. A saw mill dog comprising a supporting bar havingy a vert'cal slot, a slide movable vertically on the exterior ot said bar,

a dog bit extending through the slot in said bar, and wedge means 'operative to expand the portions of the bar at opposite sides of the slot therein within the slide and to clamp the dog bitandiy thereby clamp together the "slide, dog bit and bar.v I

6. A saw mill dog comprising an upright vertically-slotted bar, a slide movable vertically thereon and having slots in its opposite sides which aline with the slot in said bar, a dog bit extending through the slots in the slide and bar, and means operative'to expand the sides or the bar at opposite sides ot the slot therein within the slide.

7. A saw mill dog comprising an upright vertically-slotted bar, a dog bit having a portion extending through the slotted bar, and wedge means arranged within the bar and cooperative with the dog bit to secure it relatively to said bar.

8. A saw mill dog comprising a verticallyslotted supporting bar, a slide movable vertically thereon, a dog bit carried by the slide and having a portion extending through the slotted bar, and wedgesv contained within said bar and. operative to clamp the dog bit between them and to expand the bar within the slide.

9. A saw mill dog comprising a verticallyslotted supporting bar, a slide movable vertically thereon, dcg bit carried bythe slide and having a portion which passes through the slotted bar, and a pair of wedges arranged within the bar at opposite sides respectively of the dog bit and operative to clamp and secure the latter relatively to said bar.

10. A saw mill dog comprising a verti cally-slotted supporting bar, a slide movable vertically thereon, a dog bit carried by the slide and having a portion which passes through the slotted bar, wedges, one on each side of the dog bit, and means connecting the wedges to reciprocate them in unison but permitting them to move relative-ly to` ward and from one another to clamp and release the interposed dog bit.

1l. il.. saw mill dog comprising a vertically-slotted supporting bar, a slide movable vertically thereon, a dog bit carried by the slide and having a portion which passes through the slotted bar, wedges arranged within the barand at the respective sides of the dog bit, and pins connecting the wedges to reciprocate in unison but permit ting relative transverse movement between them.

l2. A saw mill dog comprising a verticallyslotted supporting bar, a slide movable vertically thereon, a dog bit carried by the slide and having'a portion which extends through the slotted bar, and a pair of wedges arranged respectively at opposite sides of the dog bit and within the slotted bar, the inner sides of the wedges having convergent surfaces to cooperate with the dog bit and their outer sides being parallel to conform with the interior of the vertically slotted bar.

13. A saw mill dog comprising a vertically-slotted bar, a slide thereon, a dog bit carried by the slide and extending through the slotted bar, and wedges arranged respectively at opposite sides of thev dog bit and within the slotted bar, the inner sides of the wedges havingvparallel surfaces and also convergent surfaces to engage the dog bit and the outer sides ofthe wedges being parallel to conform with the interior of the slotted bar. l A f.

14. A saw mill dog 'comprising a vertically-slotted tubular bar, a slide thereon, a dog bit carried by the slide and extending through the slotted bar, and wedge means movable axially within the tubular bar and operative to clamp the dog bit and to expand the bar within the. slide. n

15. A saw mill dog comprising a vertically-slotted bar, a slide movable vertically thereon, a dog bit carried by the slide and extending throughthe slotted bar, wedge means reciprocable within said bar and operative to clamp the dog bit and expand the bar within the slide, and a weighted member connected to the slitte and wedge means, said member being operative, when lifted, to release the wedge means` and operative, when lowered, to actuate the wedge means to clamp the dog bitv and expand said bar.

16. A saw mill dog comprising averticallyfslotted supporting bar, a slide movable vertically thereon, a dog bit carried by the slide and extending through the slotted bar, .vedges arranged respectively at opposite sides of the dog bit and wit-hin the slotted bar, upper and lower pins connecting the wedges to reciprocate them in unison, and a lever pivotally connected to the slide and extending into the slotted barand between said pins on the wedges for actuating the latter. Y

ln testimony whereof I have hereunto set my hand.

WILLARD NnwsoM.

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