US2695044A - Barking machine - Google Patents

Description

NOV- 23, 19 4 w. J. MILLER ErAL BARKING MACHINE -4 Sheets-Sheet 1 Filed Jan. 23, 1952 Jada 7% HTTORMEY 4 Sheets-Sheet 2 W. J. MILLER EI'AL BARKING MACHINE Nov. 23, 1954 Filed Jan. 23, 1952 BARKING MACHINE 4 Sheets-Sheet 3 Filed Jan. 23, 1952 m MnR INVENTOR.

Johnson Nov. 23, 1954 w. J. MILLER ETAL BARKING MACHINE 4 Sheets-Sheet 4 Filed Jan. 23, 1952 flTTOR/VEY 2,695,044 Fatented Nov. 23, 1954 BARKING MACHINE William J. Miller and Alfred C. Johnson, Seattle, Wash.,

assignors to Elliott Bay Mill (30., Seattle, Wash., a corporation of Washington 1 Application January 23, 1952, Serial No. 267,790

' 2 Claims. (Cl. 144-208) This invention relates to a veneer making machine and an object of this invention is to provide a veneer making machine constructed in one compact unit which will remove the bark from a log and peel or rotary cut the log to form veneer and clip the veneer into pieces all at one continuous operation.

In making veneer it is common practice to bark or removethe bark from the logs in one machine by placing said logs in chuck means and rotating them against a barker knife and thento release the logs and transfer them to a peeler where said logs are again chucked preparatory to rotary cutting or peeling them to form veneer. In placing the barked logs in the chucks of the peeler it is usually not possible to apply the second set of chucks to the logs so that they exactly coincide axially with the chucks by which the logs were held for barking and the result is that material will the log up to the new axis of rotation established by the chucks of the peeler. Also time and labor are consumed in re-chucking the log and in truing it up to the second axis of rotation.

It is an object of this invention to provide a veneer making machine in which a log can be successively barked and peeled or rotary cut to form veneer while the log is held in one set of chucks and rotated on one axis and without requiring the re-chucking of the log between the barking and peeling operations, thus saving time and labor Fig. 4 is a view partly in section and partly in elevation taken substantially on broken line 4-4 of Fig. 2.

Fig. 5 is a fragmentary sectional view taken substantially on broken line 5-5 of Fig. 1 and on a larger scale than Fig. 1, parts being shown in elevation and parts be-' ing shown by dotted lines.

Fig. 6 1s a fragmentary plan view looking down on broken line 66 of Fig. 5, parts being shown in section. Fig. 7 is a detached fragmentary sectional View showing a part of the chuck adjusting or chuck moving means;

Like reference numerals designate like parts through out the several views.

This machine comprises two spaced apart longitudinally extending side frame members 10 and 11 which are rigidly secured to and supported by and on transverse frame members 12. The members 10, 11 and 12 form a rigid and unitary frame which supports all of the operating be wasted in truing and avoiding the loss of valuable veneer stock which usually occurs, due to a change in the axis of rotation, when a log is re-chucked.

Another object is to provide a simple and eificient veneer making machine having a barker knife and a peeler knife which can be successively applied to a rotating log without loss of time while the log is held within and continuously rotated by one set of chucks and without re-chucking the log to first bark and then peel the log as it goes through the machine.

Another object of this invention is to provide a veneer making machine constructed in one single compact unit which is small enough and light enough in weight so that it may be placed on a truck and moved over ordinary highways and roads thus rendering the machine portable and making it possible to move the machine from place to place so that the machine will'be near the location where the logs are being out rather than shipping the logs to a veneer plant, which usually is located at a-substantialfdistance from the scene of the logging operations.

Another object of this invention is to provide a veneer making machine which is especially well 7 adapted for handling short pieces of logs and'for making veneer of a grade ordinarily used for cross binding or core stock and one which will make it possible to'turn or peel the logs down to a smaller diameter than is usually possible with longer pieces of logs, thus utilizing more of the core or axial portion of the logs and reducing waste of this part of the logs. Other objects of the invention will be apparent from the followingdescription and accompanying drawings.

In the drawings Figure 1 is a plan view, with parts in section, of a veneer making machine constructed in accordance with this invention.

Fig. 2 is a view in side elevation of the same looking in the direction of broken line 2-2 of Fig. 1, and on a larger scale than Fig. 1, parts being shown bydotted lines.

Fig. .3 is a front elevation of the machine and showing {he outline of a clipper diagrammaticallyby dot and dash the sleeves mechanism of the machine and all parts are compactly arranged so as to keep them within over all dimensions not exceeding the limits ordinarily permitted on public roads. This makes it possible,'withoutdis-assembling the machine, to load it onto a suitable truck and move it to successive locations where logsare being cut. i

The barker and peeler means, shown at the left in'Fig; 2, includes two axially aligned, spaced apart, rotatable, longitudinally movable chucking spindles 13 and 14 each having a chuck 15 fixedly mounted on its inner end. Each chuck 15 has inwardly protruding spikes 16 which are adapted to penetrate and enter into and hold a log or block which is to be turned.

Each spindle 13 and 14 is supported within a sleeve 17 in such a manner that the spindle is longitudinally movable within the sleeve but is not rotatable relative to the sleeve. This may be accomplished by using spline means 18, shown somewhat diagrammatically in Fig. 1, to interconnect each spindle 13 and 14 with its sleeve 17. Each sleeve 17 is rotatively supported in bearings 19 and has a relatively large sprocket wheel 20 secured thereto.

Two motors 21 and 22, Fig. 1, are provided for rotating the respective spindles 13 and 14. Each motor 21 and 22 is connected by a coupling member 23 with a shaft 24. The motor 22 is omitted in Fig. 2 and the shaft 24 thereof is shown in section. Each shaft 24 is connected by a small sprocket wheel 25 and sprocket chain 26 with one of the larger sprocket wheels 20 for driving one of the sleeves 17. The two motors 21 and 22 operate at the same rate of speed to apply torque to the two ends of a log or block B which is held in the chucks 15-16. The sprocket wheels 20 and 25 and sprocket chains 26 are diagramamtically shown in the drawings.

The spindles 13 and 14 are adapted to be longitudinally moved by nuts 27 which are threaded onto the outer end portions of said spindles. Each nut 27, see Fig. 7, is connected with the adjacent sleeve 17 by a collar 28 which is preferably made in two or more pieces and is secured as by screws or bolts 29 to an outwardly extendingfiange 30 of the said nut 27 and has an inwardly directed annular lip 31 which extends over and engages with .an external annular flange 32 on the end of the sleeve 17. This connects each nut 27 with the adjacent sleeve 17 so that the nut may be rotated relative to the sleeve but can not be moved lengthwise relative to said sleeve. Lengthwise movement of both the sleeve 17 and nut 27 is prevented by thrust means 33 which engages withthe bearings 19.

Two reversable motors 34 and 35 are provided for longitudinally moving the respective spindles 13 and 14. Each motor 34 and 35 is connected by a small sprocket wheel 36, sprocket chain 37 and large sprocket wheel 38 with one of the nuts 27. Parts 36, 37 and 38 are diagrammatically shown in the drawings. Operation of the motors 34 and .35 in one direction will engage the spikes 16 of the chucks 15 with a log or block and operation of the motors 34 and 35 in a reverse direction will withdraw the spikes 16 from the block or log and release the same. When the motors 34 and 35 are de-cnergizedand the log is being rotated in the proper direction for bark: ing or peeling the .same then the, nuts 27 will rotate with 1-7 and the motors '34 and 35 willcoast idly but may, if necessary, be started monentarily while the chucks are rotating to tighten the chucks against the log.

Barker and peeler and pressure bar means are movably supported by the frame members 10 and 11 so that they may be applied selectively to a log or block which 18 held and rotated by the chuck mechanism. The carriage means for supporting the barker and peeler and pressure bar devices comprises two side plates 40 and 41 positioned in vertical planes adjacent the inner sides of the respective frame members 10 and 11. The side plates 40 and 41 are rigidly connected with each other by a transversely extending frame member 42 of strong and substantial construction. Bolts 43 may be used to secure the end portions of the frame 42 to the respective side plates 40 and 41. The plates 40 and 41 are pivotally connected with relatively thick knee members 44 and 45 which are positioned in contact with the outer sides of the plates 40 and 41 toward the upper end of said plates and above the side frame members 10 and 11.

The pivotal connections between the side plates 40 and 41 and the respective knee members 44 and 45 are preferably formed by rigidly securing to the outer side of each side plate an arcuate track member 39, Figs. 2, and 6, which is operatively disposed within a recess 39' in the adjacent knee member. Each arcuate track member is of more than a half circle in extent but terminates short of a notch or cutaway portion in the side plates and knee members, as hereinafter described. The parts 40, 41 and 42 form a rigid carriage which is pivotally connected with the knee members 44 and 45 and one end portion of which is pivotally supported by the knee members 44 and 45 for longitudinal movement toward and away from the chuck means. The other end portion of this carriage is supported for longitudinal movement by self leveling means of a form hereinafter described.

The knee members 44 and 45 have rabbeted base portions 46, Fig. 3, which slidably support the carriage. The base portions 46 rest on the top surfaces of the frames and 11 and are engaged beneath overhanging flanges 47 of track strips 48. The track strips 48 are secured to the side frames 10 and 11 and the two chuck spindle bearings 19 adjacent the knee members 44 and 45 are mounted on these track strips. The side plates and 41 and knee members 44 and have relatively wide deep U shaped clearance notches 49 provided therein and disposed with the open ends of the notches 49 facing toward the chucks 15 and chuck spindles 13 and 14. The notches 49 provide clearance for the chucks and chuck spindles and facilitate movement of the knife carrying parts of the carriage into close proximity to the chucks and chuck spindles.

Two horizontally positioned threaded shafts 50 and 51, Fig. 1, herein termed feed screws, are provided for moving the carriage toward and away from the chuck mechanism. Each feed screw 50 and 51 is threaded through a nut 52 which is fixedly secured to the corresponding knee member 44 or 45. The end portions of the feed screws 50 and 51 remote from the chuck means extend into housings 53 which are rigid with the respective side frames 10 and 11. Bevel gears 54 in the housings 53 connect the feed screws 50 and 51 with a cross shaft 55. Thrust bearings 56 cooperate with feed screws 50 and 51 and housings 53 to prevent longitudinal movement of the feed screws relative to the housings. The cross shaft has thereon a rotatively mounted sleeve 57 which is connected for driving purposes by spur gears 58 and 59 and countershaft 60 and sprocket wheels 61 and 62 and link belt 63 with the shaft 24 which is driven by the motor 21. A clutch member is splined on the sleeve 57 so that the sleeve and clutch member must rotate together but are relatively longitudinally movable. The clutch member 64 is adapted to interlock with another clutch member 65 which is rigidly secured to the shaft 55. Clutch member 64 is movable to engage or disengage it from clutch member 65 by a lever 66. When clutch members 64 and 65 are engaged and motor 21 is operating the feed screws 50 and 51 are driven from the motor 21 and are properly synchronized with the chuck spindles for log peeling purposes. Also preferably independent driving means is connected with the shaft 55 for quick return of the carriage to a starting position and for independent feeding forward of a barker knife used in barking the logs, as hereinafter explained. The independent driving means comprises a reversible motor 67 connected by link belt and sprocket wheel means 68 with the clutch member 65 which is fixed to the shaft 55. The motor 67 is only used when clutch member 64 is disengaged and will coast freely when clutch members 64 and 65 are engaged and motor 21 is operating the feed screws 50 and 51.

The frame member 42 has a peeler knife 69 secured thereto as by a plate 70 and screws 71, Figs. 3 and 5.

Roller pressure bar means 72 of a type fully disclosed in U. S. Patents No. 2,562,868, issued July 31, 1951 and No. 2,473,541 issued June 21, 1949, is carried on a horizontal plate 76, herein termed a cap. A motor 73, Fig. 1, drives roller means 74, Fig. 5, in pressure bar 72 by link belt and sprocket wheel means 75.

' parts Two reinforcing bars or upright flanges 77 and 78 are rigid with the respective edge portions of the cap 76 and extend from end to end of said cap to reinforce and strengthen said cap. Each end portion of the cap 76 rests on a tapered wedge member 79 which has a substantially horizontal upper surface and an inclined lower surface. The wedge shaped members 79 are positioned with their thinner ends toward the chuck means. The lower inclined surface of each wedge shaped member 79 rests on a similarly inclined surface of a metal bracket 80. Each bracket 80 is positioned against the inner side of one of the side plates 40 or 41 and is rigidly secured to the plate as by bolts 81. Thus the brackets 80 are rigid relative to the frame 42 which carries the peeler knife 69. The end portion of each wedge member 79 remote from the pressure bar 72 has a downwardly offset part 82. Each part 82 fits over a stud bolt 83 which is rigidly secured to and protrudes from the end of the adjacent fixed bracket 80. Each offset part 82 is adjustably connected with one of the stud bolts 83 by nuts 84. Adjustment of the nuts 84 will longitudinally adjust the wedge members 79 and thus vertically adjust the cap 76 which car ries the roller pressure bar 72. The wedge members 79 are independently adjustable and make possible independent vertical adjustment of each end of the roller pressure bar 7 2.

Devices are provided for supporting the cap 76 against the pressure exerted by the log or block on the roller pressure bar 72 and for independently adjusting each end of the cap 76 horizontally. These devices comprise a cross shaft 85 extending between the side plates 40 and 41 and having on its opposite end portions two aligned eccentric integral bearing pins 86. The bearing pins 86 are journaled in the respective side plates 40 and 41. A lever 87 may be attached to the shaft 85 for rotatively moving the same and to hold said shaft in any desired position rotatively considered. A collar 88 is rotatively mounted on each end portion of the shaft 85 near the adjacent plate 40 or 41. Each collar 88 has a threaded shank 89 which is connected by a turnbuckle nut 90 with an oppositely threaded shank 91. Each shank 91 has a forked forward end portion 92 which is connected by a horizontal pivot member 93 with a lug 94 which is integral with the cap 76. Rotary movement of the shaft 85 will move the cap 76 and pressure bar 72 toward or away from the work and turning of the turnbuckle nuts 90 will selectively horizontally adjust either end or both ends of said cap and pressure bar.

The forward end portions of the plates 40 and 41 and other parts of the carriage are pivotally supported by the knee members 44 and 45 and cooperating track forming 46 and 47 and side frame members 10 and 11. The rear end portion of the carriage is supported by vertically adjustable self leveling means and by devices which impart a slight tilting movement to the carriage as it moves longitudinally. This slight tilting movement varies the angle of application or lead of the peeler knife as the carriage moves forwardly toward a log which 1s being reduced in diameter and facilitates smoother operation.

The supporting means for the rear end portion of the carriage comprises a transverse frame bar 95 of inverted U shape in cross section extending between the side plates 40 and 41 and rigidly secured to said plates, as by bolts 96, Fig. 5. Two bell crank arms 97 and 98 are fulcrumed in the cross bar 95 by pivots 99 adjacent the respective end portions of said cross bar 95. The horizontal arm of each bell crank 97. and 98 extends outwardly through a suitable opening in the adjacent'plate 40 or 41 and has a slide block 100, Fig. 6, attached-there: to as by a pivot pin 101. Each slide block is supported for movement longitudinally of the machine by a channel shaped track member 102, Figs. 4 and 5, which secured to the adjacent frame member or 11.

Each track member 102 is slightly inclined downwardly from right to left, Fig. 5. This incline of track members 102 brings about a slight lowering of the end portion of the carriage remote from the peeling mechanism as the carriage moves toward the peeling mechanism. The knee members 44 and 45 with hearing parts 39 and 39 pivotally support the end portion of the carriage adjacent the peeler mechanism so that the carriage is free to pivot slightly about a center close to but slightly above and forwardly of the cutting edge of the peeler knife 69. This slight pivotal movement of the carriage as said carriage is advanced toward a log which is being peeled provides a desired angular adjustment of the peeler knife known as the lead of the knife, this adjustment being conducive to smoothness and efiiciency of operation as the diameter of a log which is being peeled decreases.

A connecting rod 103 connects the lower end portions of the downwardly extending arms of the two bell cranks 97 and 98 with each other. One end of the connecting rod 103 is pivotally connected with the bell crank 97 by sleeve and pivot means 104 which prevents rotation of the connecting roll 103. The other end of the connecting rod 103, shown at the left in Fig. 4, passes through a sleeve 105 which is connected by a pivot 106 with the lower end portion of the bell crank 98. Outwardly from sleeve 105 the rod 103 is threaded through the hub portion of a small worm wheel 107 which meshes with a worm 108, see also Fig. 2. The hub of the worm wheel 107 bears against sleeve 105, preferably by means of a thrust bearing 109. This leaves the worm wheel 107 free to turn and move lengthwise on the threaded end portion of the rod 103. This endwise movement of worm wheel 109 on rod 103 adjusts the lower ends of the upright arms of the bell crank levers 97 and 98 toward and away from each other and in this way vertically adjusts the end portion of the carriage which is supported by the bell cranks 97 and 98. At the same time this end portion of the carriage is self leveling thereby making it easier to adjust and avoid twisting and warping strains.

The worm wheel 107 and worm 108 are supported in a floating housing or bracket 110. This leaves the worm wheel 107 and worm 108 and housing 110 and rod 103 free for some horizontal movement to take care of the self leveling of the end portion of the carriage which they cooperate in supporting. The worm 108 is secured to an upright floating shaft 111 which is connected by a universal coupling 112 with another upright shaft 113. The shaft 113 is rotatively supported and guided in a bracket 114 on one of the side plates such as side plate 41. A square upper end part 115 on shaft 113 facilitates the turning of shafts 113 and 111 to operate worm wheel 107 and vertically adjust the rear end portion of the carriage.

In addition to carrying the peeler knife 69 and pressure bar 72 the carriage, including parts 40 to 45 also supports barking means by which a log may be barked after it has been placed in the chucking means and before it is peeled or turned to form veneer and without releasing the log from the chucking means between the barking and peeling operations. The successive barking and peeling of a log without re-chucking said log between the barking and peeling operations results in a substantial saving in time and material as it obviates the work of re-chucking the log and obviates a loss or waste of material which usually occurs if a log is re-chucked between a barking and a peeling operation.

The barking means, Figs. 1, 3 and 5, comprises a barker knife 117 secured as by a plate 118 and screws 119 to a strong and substantial frame member 120. The barker knife 117 and frame 120 extend across the carriage between the side frame members 40 and 41 and the barker knife 117 is of substantially the same length as the peeler knife 69. The frame 120 has a slide member 121 rigidly secured to each end thereof. Each slide member 121 is movably disposed within an inclined guideway 122 which is rigid with the frame 42 and the forward end portion of the adjacent side plate 40 or 41. Movement of the two slide members 121 upwardly and toward the chuck mechanism will properly position the barker knife 117 for application to a logor block which is being supported by and rotated by the chuck mechanism. A rod 123 extends entirely across the barker frame is rigidly 12'0'ju'st below the barker end portions of said rod protrude outwardly from the slide members 121 and extend through inclined slots 124 in the respective side plates 40 and 41. Obviously the rod 123 could be replaced by rigid outwardly protruding pins on the slide members 121. Each outwardly protruding end portion of the rod 123 is pivotally engaged by one end portion of a connecting plate 125. The other end portion of each plate 125 is connected by a pivot member 126 with a U-shaped bracket 127 on the forward end portion of a piston rod 128. A wheel or roller 129 is rotatively mounted on each pivot member 126 and is adapted to roll on a horizontal track 130. Each track 130 is rigid with one of the side plates 40 or 41 and preferably has an adjustable stop member 131 mounted on the end portion thereof which is shown at the left in Figs. 2 and 5.

The piston rod 128 extends into a pneumatic cylinder 132 and has a piston 133 thereon to cooperate in moving the barker knife 117 upwardly. The barker knife 117 is used only for barking, which is rough work, and it has been found that discarded peeler knives are suitable for use as barker knives.

When the barker knife 117' is in a fully raised position, asillustrated by dot and dash lines in Fig. 5, the plates 125 will be substantially vertical and these plates 125 and the rollers 129 will support the vertical load including the down thrust of a rotating log on the barker knife 117 when barking is being done.

In barking a log, after the barker knife is raised into a position, as shown by dot and dash lines in Fig. 5, said barker knife 117 is moved toward the log while the log is being rotated by operation of the motor 67, Fig. 1. Motor 67 is a variable speed reversible motor and the barker knife can be moved rapidly toward the log until the log has been barked. Motor 67 can then be reversed to quickly move the carriage back to a starting position preparatory to peeling the log. Clutch 64-65 is disengaged while motor 67 is being used. To peel the log after it has been barked motor 67 is de-energized so that it will coast, clutch 6465 is moved to engaged position and motor 21 is operated to advance the peeler knife 69 while the log is being rotated. While the peeling operation is being carried out the barker knife is lowered into the position in which it is shown by full lines in Fig. 5. Motor 22 cooperates with motor 21 at all times in rotating the log. The motor 67 is used to retract the carriage after the peeling of a log is completed. This provides for a fast return of the carriage.

Endless traveling veneer conveying belts 135, Figs. 1, 2 and 4 are movably supported by belt supports 136 which are carried by the carriage. The belts pass around sheaves 137, 138, 139, and 141, shown by dotted lines in Fig. 1. The sheaves 137, 138 and 139 are mounted on and carried by the carriage and for this reason are movable longitudinally of the machine. The sheaves 141 are mounted on a fixed part of the frame. The sheaves 140 are floatingly supported by link members 142. The link members 142 are swingingly mounted on pivot means 143 so that the sheaves 140 are movably supported and ride in loop portions of the belts 135 and can move up and down to provide length compensating adjustment of the belts 135 as the sheaves 137, 138 and 139 are moved toward and away from the sheave 141. Preferably sheaves 141 are driven at a suitable speed to convey veneer which is being peeled from a log to a veneer clipper 144 having a clipper knife 145 which cooperates with a shear block 146 to clip the veneer.

Preferably the veneer clipper and control means therefor are of the type disclosed in U. S. Patent No. 2,394,558, issued Feb. 12, 1946 and the shear block 146 is of the type disclosed in U. S. Patent No. 2,405,598, issued Aug. 13, 1946.

In the use of this veneer making machine both knives 69 and 117 are in a retracted position, as shown by full lines in Fig. 5, while a log is being centered and secured in the chuck members 15. The chuck members are then rotated to rotate the log and, with clutch members 64 and 65 disengaged, the barker knife is first raised and then advanced by the operation of motor 67 to bark the log. The barker knife 117 is then lowered and the carriage is simultaneously moved forwardly until the peeler knife 69 is close to the barked log. Motor 67 is then deenergized and clutch 6465 engaged so that motor 21 becomes operative to feed the peeler knife 69 toward the knife-"117 and the opposite log at the proper speed for peeling. The log is not rechucked and consequently its center of rotation is not changed between the barking and peeling operation. This avoids the loss of material which would be incidental to a second truing up of the log if the center about which it is being rotated had been changed. The barking is done rapidly and little time is lost while the barker knife 117 is being lowered and the peeler knife 69 is being moved up to the log. The machine is designed to handle short pieces of log and for this reason the chuck members 15 can be of small diameter and the pieces of log can be turned down to a small diameter so that core waste is minimized.

The foregoing description and accompanying drawings clearly disclose a preferred embodiment of this invention but it will be understood that this disclosure is merely illustrative and that changes may be made within the scope of the following claims.

We claim:

1. In a veneer making machine, a frame; rotatively driven chuck means positioned at one end of said frame adapted to support and rotate a log on a horizontal axis; a carriage supported by said frame for horizontal movement toward and away from said chuck means, said carriage having two side plates rigidly connected by a cross frame member; feed screws operable to move said carriage toward and away from said chuck means; two spaced apart inclined guideways supported by said side plates between said cross frame member and the chuck means, said guideways upwardly considered being inclined from the vertical toward said chuck means; a barker knife frame extending crosswise of said carriage between said cross frame member and the chuck means; slide blocks rigid with the end portions of said barker knife frame and slidably disposed in said inclined guideways; a barker knife carried by said barker knife frame; and barker knife frame moving means connected with said slide blocks adapted to move said slide blocks and said barker frame along said guideways between a retracted position and a log barking position.

2. In a veneer making machine, a frame; rotatively driven chuck means positioned at one end of said frame adapted to support and rotate a log on a horizontal axis; a carriage supported by said frame for horizontal movement toward and away from said chuck means, said carriage having two spaced apart side plates rigidly connected by a cross frame member; feed screws operable to move said carriage; two spaced apart opposed inclined guideways supported by said side plates between said cross frame member and the chuck means; a barker knife frame extending crosswise of said carriage between said cross frame member and said chuck means; rigid slide blocks on the respective end portions of said barker knife frame slidably disposed in said inclined guideways; a barker knife carried by said barker knife frame; an inclined slot extending lengthwise of each of said inclined guideways; a pin rigid with each slide block and extending outwardly through the adjacent inclined slot; a plate pivotally connected at one end with each pin; a piston rod pivotally connected with the other end of each plate; a wheel on the pivot means connecting each plate with a piston rod; a horizontal track member rigid with each side portion of the carriage supporting each wheel for movement alongside of the carriage; and power operated means connected with each piston rod operable to move said wheel along said trackway, whereby said barker knife may be moved upwardly along said inclined trackways into log engaging position and said plates moved into substantially upright thrust resisting positions.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,670,657 Friede May 22, 1928 1,841,854 Stanley Jan. 19, 1932 2,027,295 Stoddard Jan. 7, 1936 2,340,532 Jackson Feb. 1, 1944

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