US1420961A - Sawmill carriage - Google Patents

Description

M. E. BRADY.. SAWMILL CARRIAGE.

APPLICATION FILED 0CT..8. I920.

Patented June 27, 1922.

6 SHEETS-$HEET M. E. BRADY.

SAWMILL CARRIAGE.

APPLICATION FILED OCT. 8, I920,

Patented June '27, 1922.

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M. E. BRADY.

SAWMILL CARRIAGE.

APPLICATION FILED em. 8. I920.

Patented June 27 192 USHEETS-SHEET 3.

M. ELBRADY.

SAWMILL CARRIAGE. APPLICATION FILED OCT- B. 1920.

1,420,961 PatentedJune 27, 1922.

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SAWMILL CARRIAGE. APPLICATION man 001.8, 1920.

Patented June 27, 1922.

6 SHEETS-SHEET 5- M. E. BRADY... SAWMILL CARRIAGE.

' APPLICATION FILED OCT. 8, I920.

6 SHEETS-SHEET 6- auozutoz Mumprrss MICHAEL E. BRADY, or TRAVERSECITY, MICHIGAN.-

' sAwMinL cesarean.

Application filed October 8, 1926. Serial No. 415,582.

To all whom e't may concern:

Be it known that I, MICHAEL E. BRADY, a

citizen of the United States, residing at Traverse City, in the county of Grand Traverse and State of Michigan, have in vented certain new and useful Improvements in Sawmill Carriages, of whiclrthe following is a specification. p i

- This invention relates to sawmill carriages and has special reference to the means for bringing the dogs into engagement with the log, the object of the invention beingto pro vide mechanism by the use of which the sawyer will be enabled to cut up more lumber within given period with less labor than is possible with present machines, so far as the same are known to me. he in vention also has for its object the provision of a structure in which the'dogs may be brought closer together than in previous ma" chines so that they will effectually engage and hold shorter logs than has been heretofore done without a waste .of space in the dimensions of the machine. The invention also seeks to simplify the operating niecha nism and to improve generally the construetion and arrangement of the several parts of the apparatus.

The several stated objects of the invention and such other incidental objects as will appear in the course of the following description are attained in an apparatus such as is illustrated in the accompanying drawings and the invention resides in certain novel features which will be particularly pointed out in the claims.

In the drawings- Figure 1 is a frontelevation of a sawmill carriage embodying my improvements;

Fig. 2 is a detail perspective view of a portion of the driving mechanism for bringing the dogs into engagement with the log to be cut up;

Fig. 3 is a transverse vertical section;

Fig. 4 is a plan view of the machine;

Fig. 5 is a view, partly in horizontal section and partly in plan of a portion of the driving mechanism;

Fig. 6 is a front elevation ofa form of the invention in which the dogs work on top of the log instead of the ends of the same;

Fig. 7 is a detail perspective of the dogcontrolling member shown in Fig. 6;

Fig. 8 is a view partly in end elevation and partly in transverse section;

Fig. 9 is a detail transverse section.

The su'pportingframe may beof any convenient construction and comprises base sills 1, standards 2 rising from said sills and beams 3 supported upon said standards, the

standards having webs which extend between and brace the front and rear beams and sills, as shown in Fig. 3. lized as a support'for rollers 4 which carry the front side of the carriage but tlie rear side of the carriage is equipped with grooved rollers 5 running upon a rigid track 6 secured upon a beam 7 carried by extensions Set the standards 2. The rollers 4 have smooth peripheries and are mounted in bear ing brackets 9 upon the front beam, a fiat track 10 being provided upon the under side of the carriage 11 at the front of the same to rest upon the said rollers 4 as will be readily understood on reference to Fig. 3. The track 10 may be conveniently provided by a channel beam, as shown, anda similar channel'b'eam 12 constitutes the back beam or frame member of the carriage and supports bearings in which the rollers 5 are journaled.

This arrangement of the tracks and rollers furnishesa firm support for the carriage which will hold it to a rectilinear path and will not encroach upon the space needed for the log engaging or moving mechanism. The saw 13 is carried by the front end of an arbor 1% which is mounted in suitablebean ings upon the beams 8 and is equipped at its rear end with a driving pulley 15 to which motion is imparted through a driving belt 16 from any convenient motor. Uponreferonce to Figs. 1 and 3, it will be noted that the rear track (3 passes over the saw arbor so that the travel of the carriage will not be interfered with by the saw arbor nor subject the latter to damage by blows from any of the moving parts.

The frontand rear beams 10 and 12 are rigidly connected by angle bars 17 so disposed as to engage the grooved sides of knees 18 which knees are thereby supported for sliding movement upon the transverse beams 17 so as to feed the dogs and the log held by them to the plane of the saw after each successive cut, as will be readily understood. Upon the inner side of each knee is formed or rigidly secured a rack bar 19 which meshes with a pinion 20 upon a longitudinal shaft 21 journaled in suitable bearings upon cross beams 22 of the carriage. The said shaft 21 is equipped between its The front beam 3 is uti-' works.

sprocket pinion 24, passes around a sprocket ends with a gear 23 and a sprocket pinion 24 which are fast to the shaft. The gear 23 meshes with a gear 25 loose upon a shaft 26 mounted in suitable bearings upon the carriage and forming an element of the set The chain 27, trained around the 2S loose upon the said shaft 26 and upon their opposed faces the members 25 and 28 are provided with clutch hubs 29, as clearly shown in Fig. 4. Between the clutch hubs 29, a clutch sleeve 30 is splined upon the shaft 26 and this clutch sleeve is engaged by a hand lever 31 so that it may be shifted endwise to engage either clutch hub and thereby lock the gear 25 or the sprocket 28 to the shaft 26. The shaft 21 will be rotated so that the pinions 20 will act upon the racks 19 and move the knees 18 forward or back ward accordingly as the gear 25 or the sprocket 28 is locked to the shaft 26 as will be readily understood. The shaft 26 is extended beyond the end of the carriage and at its end is equipped with a ratchet wheel 32 which is engaged by a pawl 34 carried by a lever 35 which is mounted to rock upon the shaft 26 and is operated through the medium of a bar 36 which extends to the front of the apparatus and is supported on a post or rest 37 of any convenient form. It will be readily understood that after each cut has been made through the log, the lever 35 is oscillated so as to turn the ratchet wheel one step and the train of gearing is thereby actuated so that the knees will be moved one degree toward the front of the machine and the work advanced so that it will be in proper position to be engaged by the saw for another cut. hen the entire log has been cut into the desired quantity of lumber, the lever 31 is shifted so that upon manipulation of the operating lever 35 the knees will be drawn rearwardly to their initial positions and the parts thereby set to act upon another log.

As shown most clearly in Fig. 3, the knees are constructed with upper and lower arms 38 and 39 so that a space 40 is produced open at the front of the carriage and the knees are connected by upper and lower angle bars 41 which are secured rigidly to the front extremities of the knees by bolts inse rted through their horizontal webs the vertical webs of the angle bars projecting slightly across the openings at the front of the knees so that their edges will constitute tracks or guides for the sleeves 42 in which the shanks or stems 43 of the dogs 44 are slidably mounted. The sleeves 42. as clearly shown in Figs. 2 and 3, are provided with grooves 4-5 in their upper and lower sides which engage the edges of the angle bars 41 and thereby guide the dogs in their movements toward and from the log. The bars 41 are connected by vertically disposed face plates 46 which are adjustably secured to the said bars so that they may be placed at any desired point in the length of the bars and thereby permit the dogs to be adjusted inwardly so as to engage and hold a very short log to be cut. The angle bars 41 are pro vided with openings 4'7 through their vertical webs and the face plates 46 are provided with openings adapted to register with the said openings 47, clamping bolts being inserted through the said openings and secured so as to maintain the parts against displacement while the machine is in use. The dogs consist each of a heavy fiat plate provided on one edge with teeth 48 adapted to bite into the work and a stem or shank 43 rigidly secured to the rear face of the plate and slidably fitted through the sleeve 42, as previously stated. At the rear end of each shank or stem, 1 provide the upstanding spaced lugs or pins 49 between which is received the depending rib 50 of a shifting bar 51, the said bar being hung from a rock shaft 52 by hangers 53 so that if the said shaft be rocked and the hangers swung forwardly or backwardly the bar 51 will. be likewise moved and act upon the dogs through the lugs 49 and the shanks 43 to shift the dogs forwardly or rearwardly so that they may most effectually engage and hold the work. The hangers 53 are constructed with slots 54 in their lower portions which engage pins on the bar 51 and thereby accommodate the relative angular movement of the parts. and the rock shaft 52 is journaled in suitable bearing brackets 56 secured upon and extending rearwardly from the upper angle bar 41. A hand lever 57 is secured to the rock shaft at any convenient point of the same so that it may be easily shifted when adjustment of the parts is necessary. The ends of the shifting bar 51 may be recessed, as indicated at 58 in F 2. so as to slidably engage a rib 59 on the side of the knee 18 and be thereby held a to a horizontal path as it is shifted backwardly and forwardly. This arrangement will also cause the weight of the said shifting bar to be carried by the knees and not thrown upon the dogs or the lugs 49.

The sleeves 42 are moved longitudinally of the carriage in order to bring the dogs into engagement with the work and to effect such movement of the sleeves I provide the longitudinally disposed adjusting bars 60 which are slidably mounted in suitable guides 61 on the knees and the bars 41 and are provided at their inner ends with racks 62 arranged to engage a pinion 63 at opposite sides of the shaft 64 carrying the same. The outer ends of these bars 60 are offset to present arms 65 in which are received the pins 66 extending outwardly from the respective sleeves 42. as shown in Figs. 1 and 2, springs 67 being coiled around the said pins between the arms 65 and the respectively adjacent sleeves 42. It will be readily understood that'if the pinion 63 bero tated so as to' draw the bars 60 inwardly the springs 67will be put under tension and. the sleeves 4:2 with the dogs carried thereby will be moved inwardly or toward each other and brought into engagement with the .ends of the log or other work. The springs will serve as buffers to permit the dogs to yield to the shock of contact with the work so that although the adjustment may beeflected rapidly, the force of the impact of the dogs upon thework will not'damage any of the working parts while, at the same time, the engagement of the dogs in the work will be secure; Any convenient form of abutment 68 may be provided in the pins 66 beyond the arms 65 so that when the bars 60 are moved outwardly the dogs will be withdrawn from the work.

The shaft 6i carrying the gear or pinion 63 is journaled in suitable bearings upon the carriage at the center of the same and upon the said shaft is secured a grooved pulley 69 around which a driving cable 70 is wound. This cable 70 is also trained around a guide pulley 71, supported in the main frame, and its ends are secured to a drum 7 2 fitted loose- 1y upon a clutch shaft 7 3 which is mounted in suitable bearings upon the main frame below the carriage and the plane of the saw arbor. 7 An idler shaft 7a is also mounted upon the main frame and thisshaft may be journ'aled in slidable bearings so that the guide pulleys and 7 6 carried thereby may be shifted longitudinally of the frame and utilized as tighteners to maintain the tension upon the cable 70. When the drum 72 is locked to the shaft 7 3 and turned therewith, the cable 70 will cause the pulley 69 to turn and thereby rotate the shaft 64 and actuate the parts operatively connected therewith so that the dogs will be moved into or out of engagement with the work, the direction of travel being determined by means which will be presently fully set forth.

The pulley 76, upon the tightener shaft 7 4:, guides a cable 77 which passes around a guide pulley 78 at the opposite end of the frame and has its intermediate portion wound upon a drum 79 loosely mounted upon the shaft 7 3 and similar inall respects to the drum 72. The ends of the cable 77 are secured to brackets 80 at the ends of the carriage so that when the drum 7 9 is rotated and travel thereby imparted to the cable 77, the carriage will be moved in one or the other direction.

To effect rotation of the drums 72 and 79, I spline upon the shaft 7 3, between the drums, a clutch sleeve 81 which has its ends fitted within circular chambers 82 in the adjacent ends of the respective drums so that the said clutch may frictionally engage either with the drum 7 9 through the influence of a 1n the main. frame, the spring acting upon t support 85 for saidrod at one end and 7 spring 83 coiled about a rod 8 1 slidably fitted acting at its other end upon an abutment 86 .i

on the rod. Secured on the rod 841 is. afork or yoke 87 which engages an annular groove 88 in the clutch sleeve 81,. and pivoted to the body or hub of the said fork is the inner end of a link 89 which extends forwardly and has its front end pivoted to the end of a crank 90 depending from a rock shaft 91 mounted insuitable bearings upon the main frame and extending to the end of said frame.

At its outer end, the said shaft is equipped with a forwardly projecting crank arm 92 from which a link 93 depends to connect the said arm with a foot lever 94, fulcrumed upon the base sill 1, as clearly shown tionally engage and be driven by the pinion 100 upon the shaft 101 or the pinion 102 upon the shaft 103, the said shafts being disposed parallel with the shaft 98 and carried in bearings which are provided'in rocker arms 104 mounted upon the main frame at the front and rear sides of the same. The inner rocker arms are provided each at its upper end with a pivotally fitted bracket 105 and connecting rods 106 connect each of said brackets 105 with a similar bracket 105" on the inner end of a head 107 upon the outer rocker arm 1041 at the same side of the machine. The connecting rods 106 are adjustable lengthwise in the brackets so as to compensate for wear and to attain accuracy 7 in operation. To the outer sides of the heads 107, I connect the inner ends of links 108 which are pivoted at their outer ends to.

cranks 109 rising from a rock shaft 110 0111'",

naled upon the sills 1 and equipped at its front end with a hand lever 111. It will be readily understood that by swinging the lever 111 about its: pivot, the shaft 110 will be rocked so as to act through the cranks 109 and links 108 upon the headslO? to rock the rocker arms 104: and thereby shift the shafts 101 and 103 toward or from the shaft" 98, the friction disk 100 or the friction disk 102 being thereby brought into engagement with the friction disk 99 according to the direction of movement. Upon the-rear end of each shaft 101 and 103 is secured apulley 112 and 113 respectively and. these pulleys a driving pulley 11% upon the saw arbor and a belt tightener pulley 115 carried by a swinging arm 116 mounted u 3011 the main frame. A belt 117 is trainec around the tightener pulley 115 and the driving pulley 112 with its intermediate portion passing around the pulley 11 1 and the pulley 113 as will best be understood upon reference to Fig. 1. It will thus be seen that the pulley 112 is driven in the same direction as the saw arbor, while the pulley 113 is driven in the opposite direction and the tightener pulle'y 115 exerts a constant tension upon the belt so as to maintain the same in operative engagement with the several pulleys, and it will also be readily understood that the disk 99, and the shaft 98 carrying the same, will be rotated intone or the other direction accordingly as it is driven by the pulley 100 or i the pulley 102.

It isthought the operation and advantages of my improved machine will be readily understood from the foregoing description, taken in connection with the accompanying drawings. When it is desired to saw through a log, the log is rolled into position in front of the apparatus and between the dogs. At this time the lever 111 will be in vertical {position so that the disks 100 and 102 will both be out of contact with the disk 99 and the shaft 73 will, therefore, be at rest. The sawyer by pressing upon the foot lever 94. will rock the shaft 91 so that the, crank 90 will swing rearwardly and the clutch 81 be thrown into engagement with the drum 72. At the same time the lever 111 is swung out wardly so that the disk 102 is brought into engagement with the disk 99 and the shaft 78 will be thereupon set in motion so that the drum 72 will act upon the cable to rotate the pulley 69 and shaft 6 1 and cause the bars 60 to move inwardly and carry the dogs into engagement with the log. As soon as the dogs engage the log, the pressure upon the foot lever 94 is released and the spring '83 at once expands so as to throw the clutch 81 into engagement with the drum 79, the lever 111 being moved inwardly to releasethe pulley 102 and cause the pulley 100 to engage the pulley 99, whereupon the cable 77 will be actuated so as to move the carriage, with the dogs and the log clamped by and between the dogs, toward the saw. When the saw has out completely through the log, the lever 111 is swung outwardly whereupon the direction of rotation of the shaft 73 will be reversed by reason of the disk 100 being released from the disk 99 and the disk 102 being brought into engagement with the disk 99. The carriage with the parts mounted thereon will thus be returned to its initial position after which the connecting bar 36 maybemanipulated to rotate the ratchet wheel 32 one degree and thereby cause the knees and the dogs mounted upon the knees with the log clamped between them to be moved forward a distance according to the thickness of the board which is to be cut from the log and it will be readily understood that by providing a plurality of interchangeable ratchet wheels and pawls the feed of the knees maybe accurately adjusted.

It will be readily noted that I have provided a very compact machine in which the dogs are fed into engagement with the work by the power which drives the machine and manual setting of the dogs is obviated. It will also be noted that the lever 94: may be actuated simultaneously with the lever 111 so that the direction of movement may be determined at the same instant that the moving impulse is imparted and 1 thereby enable the sawyer to save time which is now lost in performing these operations successively so that a greater quantity of lumber may be out within a given period and with less labor than is now generally done. It will also be noted that all of the controlling devices are arranged at the end of themachine remote from the saw so that the liability of the operator to be injured through contact. with the saw is minimized, and it wiil be further noted that the clutch 81 is automatically thrown into engagement with the drum 79 so that the shaft 73 will normally operate to move the carriage and the only work required of the operator from the time the log has been secured in position until it is completely out up is to shift the lever 111 so as to change the direction of travel of the carriage and slightly oscillate the lever 35 so as to feed the dogs and the log into the plane of the saw before each cut. it is to be particularly noted that the knees are connected by angle bars so that I effect an economy in space occupied by the machine without any loss of strength and the face plates which connect the said angle bars are adjustable so that a wide range of movement is permitted the dogs and the particular formation of the knees provides an open space through which the shanks of the dogs may pass to accommodate such movement. In most machines heretofore devised the knees are so constructed as to limit the movements of the dog and, consequently, reduce the capability of the dogs to engage and hold short logs or stumps. Inasmuch as the driving gearing is operated mainly through frictional engagement the liability of damage to some of the parts by choking or variation in the hardness of the log being cut is overcome.

The form of the invention illustrated in. Figs. 1 to 5 is particularly adapted for handling short logs which may be engaged at their ends by the dogs. In Fi s. 6 to 9, I have illustrated a form of the invention which is adapted especially for handling long logs which must be engaged upon their upper sides by the .dogs. In said figures the knee is indicated at 200, and 201 indicates the frame bars secured to and connecting the knees. At the center of the said frame bars, I secure a face plate 202 and the shaft 203 which controls the adjustment of the dogs is j ournaled at its front end in the said face plate, a pinion 204 being secured on the front end of the said shaft to mesh with a rack 205 disposed above the pinion. The

dogs are carried by vertically movable frames or heads 206 which are provided upon their outer edges with dovetailed ribs 207 engaging in and guided by the supporting plates or brackets 208 which are rigidly secured upon the frame bars 201. The said frames or heads 206 are each provided at its lower end witha lug 209 to which is pivoted the lower end of a link 210 which extends upwardly from said lug and is pivoted at its upper end to the outer end of a lever 211, the inner end of each lever being pivoted to the upper end of the face plate or bracket 202 at the respectively adjacent corner of the same. Intermediate the ends of each lever 211 is pivotally attached a link or pitman 212 which depends from the lever and plays at its lower end between guides 213 on the lower frame bar 201. The rack 205 is formed on the under side of aslide bar 214 which is disposed longitudinally of the frame bars 201 in advance of the same and has its ends equipped at its upper and low r sides with reversely arranged wedges or inclined projections 215, while on the links or pitmen 212 are mounted rollers 216 which are arranged to ride upon the surfaces of said wedges, as clearly shown in Fig. 6. It will be readily understood that rotation of the shaft 203 and thejpinion 20a thereon will cause the bar 214 to slide longitudinally of. the frame and will thereby bring the upper or the lower wedges 215 into active engagement'with the respective rollers 216 and cause the pitman 212 to rise or fall according to the direction of movement of the slide bar. The heads or frames 206 carrying the dogs will thus be raised or lowered inasmuch as the vertical movement of the at its front end with a downwardly pro-' jecting spur ortooth 220 which is adapted to engage in the log at the upper side of the same, as clearly shown in Fig. 8, in which figure the uppermost dog 217 is shown engaging a log 221 which has not beenfreduced to a rectangular form. The dotted lines in said figure indicate a log which has been reduced and has plane sides and it will be noted that the intermediate dog 218 may readily engage the said reduced log. The dogs 218 and 219 are pivotally supported within the frame or head 206 and when not in use may be turned pivotally so as to be housed within the head or frame. The upper dog is provided with a long shank 222 extending through the head or frame and held therein by a set bolt-223 so that when one of the lower dogs is working the uppermost dog may he slid back out of the way and held withdrawn by said set bolt.

It is obvious, that with this arrangement riage, bars extending longitudinally of the carriage on the front of the same, dogs slidably mounted on said bars, a power device under the carriage, operative connections between said power device and the carriage to effect travel ofthe carriage, and operative connections between said power device and the dogs to move the dogs into engagement with work or release them from work.

2. In a sawmill, the combination of a carriage including knees having open front ends, bars secured to and connecting the front ends of the knees and having their opposed edgesin spaced relation, dogs slidably mounted between the bars, and means .for moving the dogs along the bars.

and having their opposed edges in spaced relation, face plates adjustably secured upon and connecting said connecting bars, dogs slidably mounted between the said connecting bars, and means for moving the dogs into and out of engagement with work.

20 frame same, dogs having shanks extending between said frame bars and slidably supported thereon to move through the open front ends of the knees,.and means for moving the dogs to and from work.

6. In a sawmill, the combination of knees having open front ends, frame bars secured to and extending between the front ends of the knees, sleeves disposed transversely to the frame bars and slidably engaging the same, dogs having shanks fitted in and carried by said sleeves, and means acting on said sleeves to more the same longitudinally of the frame bars and thereby carry the dogs into or out of engagement with work.

move the same longitudinally of the frame bars and thereby carry the dogs to or from work.

8. In a sawmill, the combination of knees having open front ends, frame bars secured 3 to and extending between the front ends of the knees, dogs having shanks extending between said frame bars, means acting on the shanks of the dogs to move the same longitudinally of the frame bars and there by carry the dogs to or from work, a shifting bar disposed in rear of the frame bars and parallel therewith and operatively engaged with the shanks of the dogs, and means supported by the frame bars and the knees 4 for adjusting said shifting bar forwardly or rearwardly.

9. In a sawmill, the combination of dogs having rearwardly extending shanks, means for shifting the dogs toward or from each other to engage or release work, a shifting bar operatively engaged with the rear portions of the shanks of the dogs, a rock shaft disposed above said bar, cranks depending from said. shaft and carrying said shifting 5 bar, and means for actuating said rock shaft whereby to effect movement of the dogs toward or from the plane of the saw.

10. In a sawmill, the combination with a carriage including knees and frame bars -connecting the knees, of dogs slidably sup ported upon the frame bars. upper [and lower slides mounted upon the knees, yieldable connections between the outer ends of said slides and the respectively adjacent dogs, and means acting on the inner ends of said slides to move the same in opposite directions simultaneously.

11. In a sawmill, the combination of a carriage including knees and frame bars se- '65 cured to and connecting said knees, sleeves provided in their upper and lower sides with grooves to slidably engage the edges of the frame bars, dogs carried by said sleeves, slides mounted upon the knees and yieldably connected at their outer ends with the respectively adjacent sleeves, and means act ing on the inner ends of said slides to simul taneously move them in opposite directions.

12. In a sawmill, the combination with a carriage including knees and frame bars secured to and connecting the knees, of sleeves disposed between and slidably engaging the edges of the frame bars, dogs carried by said sleeves, stems extending outwardly from the said sleeves, slides mounted upon'the knees and having their outer ends engaged upon the said stems, springs coiled around the said stems between the outer ends of said slides and the sleeves, and means acting on the inner ends of the slides to simultaneously move them in opposite directions.

13. In a sawmill, the combination of a carriage, dogs slidably mounted upon the carriage, axially alined drums, operative connections between one of said drums and the carriage whereby rotation of said drum clutch member mounted between the drumsand axially alined therewith, means for holding said clutch member normally in engagement with the drum connected with the carriage, means for continuously rotating said clutch, means for controlling the direction of rotation of the clutch, and means for shifting the clutch into engagement with the drum connected with the dogs.

i l. In a sawmill, the combination of a carriage, dogs mountedthereon, slides connected at their outer ends with the dogs and provided at their inner ends on their opposed sides with racks, a shaft disposed between the said. racks and transversely thereto, a pinion on said shaft engaging both said racks, a pulley on said shaft spaced from the pinion, a drum disposed below the carriage, guide pulleys at opposite sides of the drum and said shaft, means for rotating the drum in either direction, and a cable wound upon the drum and upon the first-mentioned pulley and having its intermediate portions passing over the guide pulleys whereby r0- tation of the drum will cause rotation of said shaft and simultaneously move the dogs in opposite directions. s

15. In a sawmill, the combination of a main frame, a saw arbor mounted on said frame, a saw carried by the arbor, means for imparting power directly to the saw arbor, axially alined drums supported on the frame, a carriagemovably mounted on the frame, dogs mounted on the carriage, a shaft carrying the axially alined drums, operative connections between one of the drums and the carriage, operative connections between the other drum and the dogs, means for imparting power to the said shaft from the saw arbor, and means for operatively locking either drum with the said shaft.

16. In a sawmill, the combination of a main frame, a carriage mounted for travel thereon, dogs mounted on the carriage, a shaft supported on the frame below the carriage, drums loosely fitted on said shaft and operatively connected with the carriage and the dogs respectively, means for locking either drum to the shaft, a second shaft disposed on the frame parallel with the firstmentioned shaft, a friction disk secured on said shaft, actuating shafts mounted upon the frame parallel with and at opposite sides of the second-mentioned shaft, friction disks carried by the said actuating shafts and arranged to frictionally engage the first-mentioned friction disk, means for constantly driving said actuating shafts, and means for simultaneously shifting said shafts whereby the disks on either of said shafts may be operatively engaged with the disk on the second-mentioned shaft.

17. In a sawmill, the combination ofv a main frame, a carriage mounted for travel on the main frame, dogs mounted on the carriage, a pair of axially alined drums operatively connected with the dogs and the carriage respectively, a clutch disposed between the drums, means for rotating said clutch in either direction, yieldable means holding said clutch normally in engagement with that drum connected with the carriage, a rock shaft disposed upon the main frame and having a crank depending therefrom, a link connecting said crank with said clutch member, and a foot lever operatively connected with the outer end of said rock shaft whereby to cause the clutch to engage the drum connected with the dogs.

In testimony whereof I affix m signature.

MICHAEL E. BRAD [1,. s]

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