US1637907A - Sawmill dog - Google Patents

Description

Aug. 2, 1927, 1,637,907

R. E. 'LANGILL ET AL.

SAWMILL DOG Filed Jam. 25', 1926 2 Sheets-Sheet 1 ml W IN VEN TORS. "F055 5 44 9mm. A? Mu. mm 5. euerem A TTORNEYS.

R. E. LANGILL ET AL SAWMILL DOG Aug. 2 1927.

2 Sheets-Sheet 2 Filed Jan. 25, 1926 INVENTORS.

E055 A. A Ana/L 1. J Mu. mm 3 6205753 I ATTORNEYJ.

Patented Aug. 2, 1927.

noes E. LANGILL AND WILLIAM B. GRUE'IER, or ivmnoivimnngivrron cn v, ASSIGNORS TO THE PRESCOTT COMPANY, OF MEIIOMINEE, MICHIGAN, CORPORATION 01F I MICHIGAN.

This invention relates to improvements insawmill dogs of the so-called tong type.

Sawmill dogs of the character referred to comprise, in general, a knee, a pair of tong 5 arms arranged in a vertical plane transverse to the face of the knee and provided with teeth extending beyond the latter, and suit-- 'ablemea-ns or mechpnism for etfecting'movement of the tong arms toward "and away in from each other to grip and release the log. The tong teeth engage the upper and under sides or edges of the log or cant to securely hold the same against the face of the knee 'in the well-known manner. In the tong dog's constructed heretofore, the distance which the tong teeth extend outwardly beyond the face of the knee is fixed and can- .not be adjusted, so that the thickness oi. the "last board is determined by this distance which is 'necessarily'an appreciable amount for the reason that the teeth must extend outwardly beyond 'theface of the knee an appreciable amount in order to get a good grip on the log. In the so-called boss dogs, provision has been ma'defor adjusting'the teeth in a direction transverse to the "face of the knee, the teeth being moved outward.- ly to their fullest extent for holding logs and moved or adjusted to their extreme O inward position with respectto the face of the knee for holding a cant or small board. In the boss dogs, however, the teeth bite into and mar the face board, which is a serious objection, particularly in the handling and sawing of valuable timber. in our copending application Serial No. 56,590, filed September 16, 1925, a sawmill dog of "the tong type has been shown and described wherein the tong arms are adjustable longi tudinally in a direction transverse to the face of the knee whereby the tong teeth maybe moved outwardly a comparatively great distance beyond the face of the knee forholding a log, and adjusted or moved inwardly to within a comparatively small distance from the face of the knee for holding, the last board. WVhile this proposed construction has proven to'be very satisfactory and represents a distinct step forward in the art, it has been found that theupper tong tooth, which is designed particularly to hold large logs, is not so well adapted or shaped to hold boards. In this improved sawmill dog, furthermore, the tong toot-h does not move absolutely parallel with the knee.

' SAWMILL nos.

. i 7 Application filed January 25, 1926. Serial No.83-,438.

faceof the knee, and while this-is dbjectionable in the holding of logs creams, it

does make some dilference i-n the 'ho'ldingef con'iparat'lvely thin-boards. I r

' @ne of the 'zobjects of the "present invention, therefore, isto providean -improved' means for holding or g-rriding one of the tong arms of sawmill dogs ofthe character inferred to whereby the tooth fixed in the outer end of this arm may be adjusted in a direction transverseto the face o f the Another object is to provide, i-na sawmill dog of the tong type,-an auX-i l-iary toothas'sociat-ed with and having a d i fferent s'hape than one of the tongteeth, the arrangement being such that in the dogging of compara-v tively small boards, the tong teeth may be withdrawn 'or moved inwardly to permit the auxiliary tooth, which is particularly adapted and shaped for holding these comparatively small boards, to engage and hold the same, the auxiliary tooth being "guidedfor movement parallel to the face of the knee.

Other objects a after appear. For the purpose of illustrating :t

he invention, an embodiment thereof'is shown in the -drawings, in which I Figure '1 is a side elevation of the sawmill nd advantages will herein dog shown and described in our above co-"1' pending application, showing the auxiliary tooth and the improved guiding means for the upper tong arm arpp lied thereto; and

Fig. 2 is a tront elevation, looking toward 8 pivotally mounted -on a bolt "9 {extending through a shoe 10. Shoe 16) comprises a base 11 and anarm "12 extending outwardly therefrom at a right angle theretmthe-outer I end of arm 12 being provided with-a down wardly extending portion 18 provided with an opening for receiving bdlt-9' and which registers with a s'imilaroperiing in ba'se 111, as more clearly shown in Fig.2. The head 14: of bolt 9 acts with the spaced members 15 and '16 to guideshoe '10 for movement,

back ofmembers 15 and 16to act with head 14- of bolt 9 to guide shoe 10 and hold the same; in operativerelation withrespect to the knee. Rollers 24. may be loosely fitted on bolts 9, and 22 and arranged to move between the adjacent edges of members 15 and 16 to facilitatevertical sliding movement of shoe 1t). Asashown in Fig. 1, the auxillary tooth 21 isof a different shape than the tong tooth 2 and is particularly adapted to engage the upper edge of the comparatively small board 25 to hold the same securely against the face 26 of the knee, the

auxiliary tooth 21 extending only a small distanceioutwardly beyond the knee face so thatthe last board maybe comparatively A lever 27 is loosely mounted on shaft 6 and connected by means of an arm 28 to an eccentric sheave 29 mounted on an eccentric i 30 fixed to a shaft 31, the latter beingroa i tatedin either direction bymeans of a reversible electric motor 32 connected thereto in any suitable manner. Lever-27 s pro vided at the upper endthereof with an adjustable bolt 33 engaging theadjacent rear edge of arm 5, a bolt 34- extending through an opening in, a pin 35 carried by arm 5 and threaded upon the end of bolt 34:, whereby .arm 5 is connected to lever27 for movein block 42 keyed to shaft 31.

being pivotally connected at 36 to lever 27,

{a spring 37 being arranged on boltB land compressed between pin 35 and; nuts 38 ment therewith. {The lower tong arm 39 is *i upivotally connected at 'itsrear end 'to a link 10 connected to a crank pin 41' fixed to a end oftong arm 39 is provided with a tooth a 43 and is loosely, fitted in a shoe 14:, a bolt 1 45" extending loosely through this shoe and beingprovided with a head 46 fitting "back of members 15 and 16 for the purpose ported forpivotal movement on a shaft 51' of guiding the shoe for vertical movement and holding the same 1n operative relation with respect to knee 17 A roller 4:7, similar 1101101181824, may be loosely arranged on bolt 15 between members 15 and 16,

y A rack 18 is pivotally connected to lower tong arm 39 by means of a pin 49 and er;- tends upwardly through a housing 50 supj ournaled in bearings 52with which the upper tong arm 1 1s provided at each s1de thereof, a pinion (not shown) being fixed to shaft 51 and being arranged in mesh with the teeth of rack 48 so that the tong arms .lhe dotted line position.

The forward 1 and 39 may be moved toward or away 7 from each other upon rotation of shaft 51 in the desired direction by means of a re versible electric motor 53 connected to shaft 52 in any suitable manner. i

' The operation of the improved sawmill dog is as follows: In dogging a log, motor 32 is operated to rotate shaft 31 in a counterclockwise direction to effect rotary movement of lever 27 in this direction about shaft 6, bolt engaging the rear edge of arm 5 to move upper tong arm 1 forward so thatthe tong tooth 2 moves forward a a substantial distance in a direction transverse to' the face 26 of the knee to the dotted line position, which position is determined by the engagement of the stop "bolt'54 with block 4-2. This forward movement of the upper tong arm is accompanied by a similar movement of lower tong arm 39, the sliding fit of the forward end of this armin shoe 4 1 permitting this movement-of the arm to project the tong'tooth 43 a substantial distance beyond the face of the knee to The motor 53 is then operated 1n the usual manner to effect ncrement of the tong arms toward each other to grip or hold the log. When'it is desired to saw a thinboard, motor 53 is reversed to withdraw the tong teeth 2 and 1&3 to the respective positions thereof shown in full lines, which positions are determined by engagement of the stop bolt 55-with block $2, the arrangement being such that tooth" 2 is completely withdrawn to a position to the right of the knee face 26, as shown, the

lam

lower tong tooth 43 extending outwardly beyond the face of the knee, a comparatively small amount equal substantially to the amount or distance which auxiliary tooth 21 extends beyond the face of the l nee,'as

shown. The lower end portioirof members 15 and 16 are parallelto face 26 of the knee,

so that the auxiliary tooth moves parallel therewith. c V

d From the foregoing it will betseen that shoe 10 and hanger 8 supported thereby provide means for supporting the upper tong arm 1 and permit longitudinal sliding movement or-adjustment thereof in'adirection transverse to the face 26 of thelknee whereby tong tooth 2 may be projected-or extemled outwardly to the dotted line; position 7 shown, or completely withdrawmasshown in full lines, to permit auxiliary tooth' 2l to engage the upper edge of board;25 and to cooperate with tooth 43 to hold the latter securely against the face of the knee, the

advantages of the tong tooth 2 thus being obtained in the holding of logs andthe advantages of the auxiliary tooth 21 being obtained in the holding ofcomparatively small timber and boards. p i V The various other parts of the sawmill dog, such as the driving connections between Lil -motor 53 and shaft 5 1 and between motor 32 and shaft 31, are shown ancl'described in detail in our above copending application,

skilled in the art to understand the manner of embodying the Construction constituting the present invention "in a sawmill dog of the 'tong type, such as 1s shown 1n our said application.

A preferred embodiment of the invention has been shown and described, but of'course various changes in the size, shape and arrangement ofthe parts may be adopted without departing from the spirit of the invention or the scope of the claims.

The invention claimed is:

1. In a sawmill dog, a knee having a verticaliface', a shoe, a hanger, a bolt connecting said shoe and hanger for pivotal movement with respect to each other and arranged with its head engaging said knee to guide said shoe and hanger for movement parallel to the knee face, a log-holding arm supported for pivotal movement in a vertical plane and arranged with its log-engaging end extending loosely through said hanger and beyondthe knee face, and means operable to effect said pivotal movement of said arm.

2. In a sawmill dog, a knee, a shoe, means for constraining the shoe to adjustments up and down in a vertical plane, a log-holding arm having a log-holding tooth at its outer end portion, means for positively interconnecting the shoe and said arm to constrain the shoe to move up and down vertically with the arm while permitting the arm to be adjusted independently of the shoe inwardly and outwardly with respect to the knee, means cooperable with the arm for moving the same up and down in a vertical plane whereby the shoe is also moved up and down in a vertical plane, and an auxiliary tooth fixed 'to the shoe so as to partake of the vertical movements thereof under the influence of the arm, said auxiliary tooth being designed to engage a faced log or board.

8. In a sawmill dog, a knee having a face, a log-holding arm having a log-engaging tooth at its outer end, means for constraining the log-holding arm to partake of up and down movement in a vertical plane and in and out translatory movement transverse to the knee face, means cooperable with said log-holding arm for moving it up and down in a vertical plane and an auxiliary tooth constrained to move vertically and parallel to the face of the knee under the influence of the log-holding arm and designed to engage a faced board or log.

4c. In a sawmill dog, a knee having a vertical face, a log-holding arm arranged transversely of the knee face and supported at its rear end for pivotal movement in a vertical plane and about a relatively fixed axis, a shoe, means extending laterally from said shoeand engaging said knee to guide said shoe for movement parallel to the knee face, :a "hanger slidably receiving and :supporting "the log-engaging end 'of said arm and carried :bysaid shoe for vertical move ment "therewith and 'pivotally connected thereto to permittilting'of said "hanger upon vertical 'movement'of said arm about said axis simultaneously with similar movement 'ofsa'id'shoeparal'lel 'to the knee face, and

means operable to cause saidpivotal'move ment of said a-rn'n r 5. In'a sa'wn' ill dog of'the tong ty-pe,*a

knee having a face, a shoe associated with said knee for vertical movement with respect thereto and comprising a base and an arni extending outwardly from said base' at one end tliereofa'nd provided with a downward ly extending portion, a member arranged between said base and said portion, said member and said base and said portion be ing provided with registering openings, means extending through said openings for holding said shoe and member in assembled relation, an arm arranged transversely of the knee face and extending loosely through said member, said arm being provided with a tooth at the outer end thereof, and means for causing sliding movement of said arm with respect to said member whereby said toot-h may be adjusted with respect to the knee face.

6. In a sawmill dog, a knee, a log-holding arm having a log-engaging tooth and arranged with said tooth disposed adjacent the knee face, meanssupporting said arm for rotary movement in a fixed vertical plane and for bodily movement insaid plane in a direction transverse 'to the knee face to adjust said tooth varying distances with respect to the later, means operable to impart said movements to said arm, and an auxiliary tooth' extending outwardly beyond the knee face and guided and supported for movement parallel thereto and for move ment with said arm in said vertical plane, said auxiliary tooth being operable to engage a faced log upon bodily movement of said arm in said plane to its respective position of adjustment to place said first-named tooth inwardly beyond the knee face.

7. In a sawmill dog, a knee having a 'vertical face, a shoe, a hanger, a bolt connecting sa1d shoe and hanger for pivotal movement with respect to' each other and arranged wlth its head engaging sa1d knee to guide said shoe and hanger for movement parallel to the knee face, a log-holding arm supported'for pivotal movement in a vertical plane and arranged with its log-engaging end extending loosely through said hanger, and beyond the knee face, an auxiliary tooth car ried by said shoe and projecting beyond the knee faceshort of the range of operation of said log-engaging end and disposed in such ise as to engage a faced log upon move ment of said arm With respectto saidhanger to position its log-engaging end inwardly with respect to the knee face, means for imparting said last-named movement to said arm, and means operable to effect saidpivotal movement of sald arm.

8. In a sawmill dog, a knee having a vertical face, a log-holding arm arranged transversely oi the kneeface and supported at its rear end for pivotal movement in a Vertical plane and about a relatively fixed axis, a shoe, means extending laterally from said shoe and engaging said knee to gulde sald shoe for movement parallel to the knee face,

a hanger slidably receiving and supporting the log-engaglngend of sa d arm and carried by sald shoe for vertlcal movement therewith and pivotally connected thereto to 7 permit tilting of said hanger upon vertical movement of said arm about said axis simultaneously with slm lar movement of semi shoe parallel 'to the knee face, an auxil ary tooth carried by said shoe and projecting beyond the knee face short ofthe ran e of operationof said log-engaging end and disposed lIlSLlCh Wise as to enga e a facedlog upon slldlng movement of said arm with respect to said hanger to position itslog-en a ROSSEILANGILL. a WI IAM RU R

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