US1128795A - Trimmer-saw. - Google Patents

Description

W. H.. LBER.

TBIMMER SAW. APP'LIOMION FILED my z3. 1914.

l El @@WH @Nemesi Feb. 16, w

v 2 SHEETS-SHEET i Mmmm MMM/p VV; H. LIBER.

TBIMMER SglW.

' APPLIOATION FILED MAY 23, 1914. MWMW@ e Patented Feb. 16, 1915.

2 SHEETS-SHEET z.

1eme rrrr WILLTAM H. LIEBER, OFA MILWAUKEEpWISC/ONSIN, ASSIGNOR`TO ALLES-GHALMERS MANUFACTURING COMPANY, OF MILWAUKEE, W'ISCONSIN', A CORPORATION 0 y DELAWARE.

- Application filed May as, 1914. serial no. 340,935.

To all whom t may concern.'

Be it known that I,WILLIAM H. LIEBER, a citizen of the United States, residing at Milwaukee, -in the county of Milwaukee and` State of Wisconsin, have invented acertain new and useful Improvement 1n Trimmer- Saws, of which the following is a specifica' tion.

This invention relates to improvements in the construction of saw mill machinery and particularly to improvements in apparatus for permitting control of the positions of ay selective or collective positioning of a plurality of trimmer saws,fwhicl1 is simple in construction and efficient in operation.

Some of themore specific objects 'of the invention are as follows:

To provide a device for permitting either individual, selective or collective actuation of a plurality of saws irrespective of the positions of prior setting of the individual saws at the time such nactuation is desired.

To provide means for -permitting successive .positioning of an predetermined allotment of the saws, as istinguished from the simultaneous positioning which has been customary in devices of the prior art.

To provide means for permitting rapid successive collective positioning of all of the saws.

To provide means for permitting rapid successive selective positioning of the saws.

' To provide means for automatically returning the collective and selective actuating mechanism to normal or mid position.

To provide means in the luid pressure actuated saw actuating device, for insuring a proper supply of operating ,fluid to each of the saw actuating devices during collective To provide a device in which the collec-1 tive and selective controlling actuating demarianna-saw.

lSpecification of Letters Patent.

-ing device.

Patented lFeb. M, T9915.

vices are operable with a minimum expenditure of manual power. This result is ac complished bythe use of a manually contro1led` motor which may be operated either mechanically, pneumatically or electrically as desired.Y In the present disclosure the motor consists of a pneumatically operated piston, but any of the wellknown mechanical devices'for accomplishing a similar re sult may be substituted'without departing from the scope of the present-invention.

To provide a fluid pressure admission means or valve for each of the saw position.-

and eiiicient in operation. Tn the present disclosure the fluid admission valves are subjected to an unbalanced pressure which tends at all times to maintain the valves in a position corresponding to saws up position,

-so that upon'release of the individual controlling levers, the valves automatically tend to return the levers to saws up position.

y To provide means for permitting the use of but a single connector between "each of the individualA controlling levers and its cory responding saw position controlling valve. The connector vinvolved in the present in-v vention is so constructed as to permit etlicient use thereof in conjunction with guiding pulleys of very small diameter, this featurebeing the result ofthe formation of the portion of the connector adjacent to the guiding pulley of highly flexible material.

Some of the novel features shown and described herein are claimed in copending application Serial No. 749,539, filed February ing devices, which is simple in construction A clear conception of an embodiment of v the invention may be had by referring to the drawings accompanying and forming a part of this specication in which like reference characters designate the same or similar parts in thevarious views.

Figure 1 is an end view, partly in section, of a trimmer sa'w position controlling actuating device showing the master lever in mid position and showing some of the individual levers in each of the extreme positions. Fig. 2 is a fragmentary front view of a trimmer saw position controlling actuat- Fig. 3 is a fragmentary plan view of a trimmer saw position controlling actuating device, the actuating levers and supporting shaft therefor being omitted.

Fig. Il is an end view, partly in section, of U0 "a trimmer saw position controlling actuatingdevice showing the master lever and the motor controlled thereby, in collective controlling position, and-showing all of the invertical sectionthrough one of the individual saw positions controlling valves and a portion of the connection. leading to the individual actuating device thereof.

In the device disclosed in the drawings the saws are brought into cutting position by their own weight combined with that of saw supporting arms and the elements bearing against these arms, and are raised out of cutting position by means of uid pressure admitted below the pistons of the saw positioning mechanisms. In order to facilitate explanation, the positions correspond-- ing to intol and out of cutting position'swill ybe designated as saws down and saws' up position, respectively. It should be understood, however, that these termsare correct only when applied to an overhead trimmer, and it is not intended to limit the application of this invention to that type of ltrimmer by the use of these terms. The term collective 'as used in the present i specification designates allof the saws contro'llablev by the mechanism. The term selectivedesignates a predetermined allotment or portion ofthe total number of saws commonly knownas the Slasher saws. The saws other than the selective saws are des-` ignated as intermediate saws. The collective saws therefore include both the .selective or' Slasher saws and the intermediate or non-Slasher saws.

The ordinary trimmer saw equipment includes a lumber conveying table 73, upon which the material to be trimmed is automatically fed toward the. saws 67 by means of a suitable conveying mechanism, see Fig. 8. The individual saws 67 are supported by arms 66 which swing about stationary pivots 69 on the mill framing. A common driving shaft 7 0 carries a series of driving pulleys -71 which aredrivingly connected to the saw vpulleys 72 bymeans of suitable belts 68.

The location of the pivots 69 of the arms 66 is such that with the saws 67 insaws down position, the belts 68 are taut, and with the` saws 67 in saws up position, the belts 68 are exed,

Fach of the individual saw positioning means consists of a. cylinder 62 having an formed of piping having threaded ends for connection with the end head 81 and liange 82, see'Figs. 8 and 9.

A piston 84 is reciprocable within each of the cylinders G2 and is capable of imparting -motion to its respective saw 67 through a piston-rod 64, connection'96, adjustable conl neetion Gand arm 66. The point of exit of the piston rod 61 from within the cylinder 62 is packedby means of a suitable stalling box 87. The combined weight of the piston 84, rod 64, connections 96, G5, saw carrying arm 66, and saw 67, is capable of moving the saw 67 rapidly into saws down or cutting position upon release-of fluid pressure from within the lower piston chamber. The upper portion of the cylinder 62 is provided with a relief port 83 located a sho'rt distance below'the end of the cylinder, which permits escape of the major portion of the air from within the cylinder 62 as the piston 811 travels upwardly therein but which permits retention of sufficient air within the cylinder to form an air cushion for the piston at the end of its up stroke.

. The bracket 63 has a valve casing 77 formed in the lower end thereof. lThe valve casing-7 7 is bored toreceive the piston valve 95, the lower end of which is of ,enlarged diameter as compared to the upper portions thereof. The valve 95, see Fig. 10, is formed with two cylindrical .portions 100, 101 of equal diameter, which are connected by means of a valve stem 102. The lower valve portion 100 controls communication between the fluid pressure inlet pipe 93 and the common inletand exhaust port 92. The upper valve portion 101 controls communication between the' port 92 and the exhaust port 94. The common inlet and exhaust port 92 passes .upwardly through the bracket G3 and vopens directly into the lower piston chamber of the cylinder 62. The upper end of the port' 92 is provided with a vball check valve 89 which permits the passage of fluid, through the port 92 into the cylinder G2 but fluid within the lower piston chamber and permitting the piston 84 vto compress this Aretained fluid during its travel beyond the end of the port 90.

.The common fluid pressure supply pipe or header 7 6 is connected with thevalve cas weaves ings 77 through the branch pipes93. Each branch pipe 93 connects with the bore of its corresponding valve casing at a point somewhat above the enlarged lower end of the valve 95, thus maintaining the'annular upper surface of the valve 95, which is formed above and directly adjacent to the enlargementof the lower end of the valve, under unbalanced pressure. rll`he unbalanced pressure upon the valve 95 tends to force the valve in a downward direction and to maintain fluid pressure beneath the saw positioning piston 844 at all times.

The 'valves 95 have their upper ends con-- nected to suitable rictuating connections or Wires75 by means of short lengths of highly flexible material such as cables or `chains 86. 'llhese chains 86 coact with small guide pulleys '85 Acarried by brackets 98 'The brackets 98 are swingable about the axes of" *i direction with equal efCenCy lThe 'upper ends of the' valves 95 are adapted to coaot with projections formed on the safety 'de vices or stops 88 and to carry these projections in contact with the bracket stops 91:

lhe safety stops 88 become effective whenever the liuid pressure in, the lower ,piston chambers of the cylinders 62fails, to pre nectors vent the saws 67 frornrnoving downwardly at such times. This safety device, however,

does not form any part ofthe present invention and further descriptionthereof is therefore deemed unnecessary.

The o erating ends of the wires or con- 5 are connected to the bell cranks l 74 through suitable adjusting devices 78, by

means of which the proper tension upon the connectors 75 may be retained. IThe bell` cranks 7 4 are pivotedin swivel. brackets 79 which are pivoted in stationary brackets 80 by means of pivot pins 97. 4'llhe remaining arms of the bell cranks 74 areconnected to the lower ends of the operating .wires or' connectors 50, the upper ends of which are connected to the individual operating levers Aas will be later explained. The-axes of the connectors 50 and the pins.97 coincide so that the swivel brackets 79 may be swung into any desired angular position for proper actuation of their corresponding Valves 95.

-lhe saw controlling valve actuating device comprises a plurality of individual levers 15, 16, and a master lever 17, all of which are mounted to swing about a common supporting shaft 21, see Figs. 1 to 4. 'lhe levers 15, 16, are alike in construction and have front and rear projections 42', 43, extendingl radially from their supporting hubs. The rear projections 48 are provided with openings for connecting the operatingv connectors '50 to the levers. 'llheupper extremities of the levers 15, 16, are formed to permit ready manipulation of the levers by' means of the fingertips, and are provided with s aw designating numerals. 'llhe levers 15 which are provided with the odd numbered saw designating numerals at the upper ends thereof, are adapted to actuate the selectit'fe or ,Slasher saws. The levers 16 which are provided with'the-even numbered saw designating numerals, are adapted to ,actuate the intermediate or non-Slasher saws. The arrangement of levers as herein shown Vand described applies to a fourteen saw trier in which theslasher and intermediate saws are ralternately, arranged,

bute Shana te understood that this dis bearing'. 1`hebearings 19, 20, are supportedA upon ,a suitable lever bracket 18 which is supported upon the supporting beam 23 Inounte'd adjacent tothe operators stand. The collar 38 vservesfto prevent. the master lever '17 lfrom leaving the overhanging end of theshaft 21.

The master lever 17 differs. from the individual levers 155 16, in that it has no projections 42, 43, but has a downwardly extending valve operating projection 24. The lower extremity of the projection 24 coacts with a recess in the upper portion of the slide valve 25. The slide valve 25 is adapted to control the admission vand exhaust of fluid under pressure to the piston chambers of the motor cylinder 22, see-Figs. 1 and 4. In practice it would be preferable to subject the upper portion of the lvalve-25 to duid pressure, but the disclosure has been omitted to simplify explanation and disclosure of the invention. 'lhe ports 35 normally connect the extreme ends of the lcylica f lever 17 is normally maintained in its vertical or mid position by means of a coiled Yspring 41 thecnds of which cross each other and coact with opposite sides of the stationary projection 40 on the front bearing 19 and with the master lever returning pin 39 which projects laterally from the master lever. rllhe spring 4l besides tending to return ythe master leverA 17 to midwposition, also returns the valve 25 leo to mid position upon release of the master lever, and automatically establishes communication between. the chambers on the' opposite sides of themotor piston 34 and the atmosphere. l

The motor piston 34 is provided with a rod 33 which projects through both end heads ofthe cylinder 22. The ends oft-he rod 33 coact with the lower master and slasher bell crank arms 27, 28, respectively, which are secured to the vertical shafts '31, 32, respectively. The'shaft 31 is mounted in bearings in the bracket 29, while the shaft 32 is mounted in bearings in the bracket 30, these brackets being supported directly from 4the sides of thebeam 23. The upper bell-4 crankarms 4,8', 49,` are secured to the upper ends of the shafts 31, 32, respectively, and are disposed substantially at right angles tothe lower bell crank arms 27, 28, respectively. Each of the shafts 31., 32,

is provided with a returning arm 36 which positionthrough the rod 33, so that the springs SZfautomatically return the piston' 34 to mid position' upon return of the valve 25 to mid position.A v

- The lever bracket 18 is provided with tw parallel longitudinally extending slots'in the'front portion thereof, and one longitl'ldinally extending slot in the rear portion 10.

thereof. These slots are located underneath f the projections 42, 43, of the levers 15, 16. The master rod 44, 'see Figs. 1 to 5, is nornially slidably mounted within one of the slots in the ont portion of the bracket '18 and hasgits end connected to the swinging extremity of, the bell crank arm 48. The intermediate lever actuating rod 45, see Fig. 6,.,is normally slidably mounted in the remaining 'slot in the front portion of the bracket 18, and has its one end connected to oneezrtremity of a cross connecting'lever 47 which is pivotally mounted upon the bracket 18 by means of a pivot 52.` The Slasher lever actuating red 46, see Fig. 7, is normally slidably-mounted in the slot in ther-ear por tion ofthe bracketvv 18, and has one of its ends..connected to the. swinging end of the Abell crank arm 49, and vhas its opposite end connected to thefremaining; extremity ofthe cross connecting lever 47.

The master rod 44, see Fig. 5, is provided with Ja -series' of serrations orv notches, the side wallsf56A of which are normally adjacent to the' corresponding projections 42 of the' individual leversgl, 16. .The inclined lever releasing surfaces 53 of the master rod 44 are so located that no two of the notches in the master rod 44 are of the same width. The intermediate lever actuating rod 45 is provided with a series of serrations or notches, the side walls 57 of which are normally adjacent to the corresponding projections 42' of the intermediate levers 16.

.The inclined intermediate lever releasing surfaces 5.4. of the rod 45 are so located that no two of thejnotches in the intermediate lever actuating rod 45 are of the same width. The slasher lever actuating rod 46 is vprovided with a series of serrations or notches, the side walls 58 of which are normally adjacent to the corresponding projections 43 of the Slasher levers 15. The inclined Slasher lever actuating surfaces 55 of the slasher lever actuatingrod are so lo- 'cated that no two of the notches in the rod 46 are of equal width.

The levers 15, 16, are normallyr held in a position corresponding to saws up position by means of the unbalanced pressure upon the valves 95. If, however, these levers are placed in positions corresponding to saws down position, the levers are retained in such position by means of leaf springs 51 which are secured to the bracket 18 and which have wedge shaped ends coacting in central grooves in the lower portions of the hubs of the levers 15, 16.

' During the normal operation of the device, and at such times when the collective Vand selective'positioning of the saws 67 is 'not desired, the master lever andthe mech` anism controlled thereby is in the position shown in Figs. 1 and 3, the actuation of the individual levers 15, 16, being unrestrained. With the mechanism thus positioned, any one or more of the individual saws 67 may be brought into cutting or saws down position by manually pulling the corresponding lever 15,716, toward the operator. A pull on one of the levers 15, 16, acts through the corresponding connector 50, bell crank 74, connector and chain 86 to raise the valve 95, thus establishing communication between the chamber of the corresponding saw actuating piston 84 and the atmosphere through the ports 90, 92 and 94. This rcleasc of iiuid pressure from beneath the piston 84 permits the saw 67 controlled thereby to move into cutting position due to the action of gravity upon the saw and the connected elments. During the upward movement of the valve 95, the safety device end of the cylinder 62. T he continued downward movement of the piston 840cm presses the confined fluid and forms an automatic cushion for the saw 67 at the end lll ' 1 past the ballvalve 89.

of Vits downward stroke. When the lever 1 5, 16, has been pulled` forward to itsv eX- treme position, the wedge of the corresponding leaf spring 51 adjacent to the hub of the lever'snaps intov the recess in the lower portion of the hub and holds or locks the, lever in 'saws down position. Upon release of the lock? adorded by the spring 51, the fluid pressure from the supply header 76l acting up'hn the unbalanced area of the valve .95,

automatically forces the valve 95 downwardly'and causes the corresponding individual'lever to assume itsextreme position toward the right as viewed in Fig.v 1, which position corresponds 'of saws up position. As'the valve 95 assumes its lower position as disclosed in Figs. 9 and 10, the communication to thefatinosphere through the port 94 is cut 0E and fluid under pressure is ad-"v mitted from the common supply header 76 through the pipe 93 and ports 90, 92, to the' thiscopined Aair and forms an automatic cushion for the -piston 84 at the endof its upv-stroke.` `Duringj the upward movement off-the piston rod 64, the safetyv stop `88 will noticlutch'the rod 64, such clutching occur-` ring' only during the downward t movement ofthe rod 64 andwith the valve 95 in its lowerm'ost position. y

`lt will he notedA that the saws 67` are placed into cutting position by a positive pull on their corresponding individual le` vers 15, 16, but may be placed out of cutting position automatically 'by merely releasing the lock aorded by the .springs 51 upon the corresponding individual levers. l,llt should 'alsobe noted that Iif for anyreason the pressure in the supply header 76 fails with the valves 95 in-their lo'wermost position, the safety device or stop 88 willautomatic'ally prevent dropping of the corresponding sawsbelow the positions heldby these saws at the time of the Huid pressure failure. y l

lf it is desi'red'to operate the saws collectivelyjto raise the saine, this may be done by pulling or swinging the master lever 17 toward1 the operator. Such motion of the master lever 17 causes the valve 25 to establishr communication between-the pressure inlet'p'ort 26 and the port'35' at the right, of

Y the. cylinder 22 as viewed in Fig. 1. This establishment of coinn'iunication permits fluid under pressure to enter 'the right hand piston chamber and to force the piston 34 toward the left to the eXtreme position` i toswing these levers a suiiicient amount to release the lock a'orded lloy the correspondingspringsv This release of the individual levers immediately permits4 the unbalanced pressure on the corresponding valves 95 to become effective and to successively place all of the valves 95 of the corresponding individual levers into sawsV up position withaalrfesulting movement ofl the saws out of'cutting position.l lf previously to the master actuation, any ofthe saws. have been in saws up position, such saws and their corresponding actuating mechanism will not be' a'ected by the movement of the" master rod 44. llt should be noted that lby fori'ning` the detents in the upper portion of the ymaster rod 44 of di'erent Widths, the saws are successively actuated, thus permitting la gradual dow of the Huid under pressure from the common header 76 to the actuating cylinders.` This feature is of importance since it permits the proper supply of actuating lfluid to each ofA the saw actuating :cylinders l62 at ,the proper time, whereas if `the actuation ofthe saws is simultaneous, the header 76 must either be made very large' in diameter or thesaws near the end of the header remote from the supply inlet will not receive a proper supply of actuating fluid. While the actuation of the saws inthepresent device is successive, 'the total time consumed in raising all of the saws "in the usual trimmer saw equipnient of .from ten to twentysaws, would not he objectionable and the advantage of hav-` ;:a proper supply of actuatingfluid for -eacliwof thesaws would be a 'decided one. Upon releaseof the master actuating lever ict 17 by.' the operator, the spring 41 imme- -f diately' becomes e'ective in returning the master lever 17 to its normal or mid position. This return of the master lever `1.7 causes the valve 2 5 to. assume its` mid position and to establish communication between' the chamber at the right f the motor piston l24 and the atmosphere through the port 35.4 llpon'release. of this pressurethe pistion 34 through the rod 33, is returned to mid position loy the spring 87 which-presses against the returning arm 36` and the web of the bracket 29, causing the'bell crank 27, 48, to assume its normal position as shown in Fig. 3. With the return of the bell crank arm 48 to normal position, the. normal po sition of the, master rod 44- is restored.

If it is desired to operate the. saws 67 se 5, lectively to lower the: Slasher saws and to raise` ltheI intermediate saws, this may be done by pushing' or swinging the. master lever 17 away from the operators stand. Such motion of the master lever 1'( causes 19 the valve 25v to establish Comunication be! cross connecting lever 47' to the intermediate 26 lever'releasing rod .45, causing the rod 45 to move. toward thelett'l simultaneously with. the movement. of the rod-46 toward the right. Thev movement of the intermediate lever releasingy rod toward the leftr causes` the inclined surfaces 54 thereo` to.v successively coact with the adjacent projections 42 on the intermediate levers 16 and to swing these levers a sutlicient amount to release the` lock afforded by the corresponding springs' 51.. This release of the intermediate levers 16 immediately permits the unbalanced pres- .sure 'on'. the.y valves 95 corresponding to these levers to become edectivey andto successively place the valves into. saws up position. The movement of the intermediate saw valves 95 into saws up position causes the intermedin ate levers 16 to take corresponding positions, as above explained, and places the intermediate saws out of cutting position. vDuring the` movement ot the Slasher lever actuating Arod 46 toward the right, the inclined surfaces 55 successively coact with. the adjacent projections 43 of the Slasherv levers 15v and gradually move these levers into positions corresponding to. saws down, position. As the slasher levers are swung into saws down position, the corresponding springs` 51 automatically become effective, to lock these levers into such position.:l It should be noted thatI during movement of' the' master lever 17 for actuationof the saws selectively, the intermediate saws which are at theV time in saws up position as well as the Slasher saws which are. in saws down position, will not be atlected. Upon release of the master actuating lever 17 by the operator, the' spring 41 again becomes' effective in return` ing the master lever to normal or mid position, as above explained. The valve 25, piston 34 'and . rods 45, 4 6, thereupon auto,-

rlhis establishment of use ofa very small guiding pulley adjacent inaeyes matically move to normal or mid position, thus placing the mechanism in condition for either and immediate collective, selective or individual actuation of the saws.

The use of the motor to collectively and selectively actuate the individual levers re duces the 'amount of manual power necessaryV tooperate the levers, to a minimum. The rapid successive actuation of the saws as above explained, either collectively or selectively,y insures the `provisioi'i of a proper supply of actuating iluid to the various actuating cylinders. 'lhe'use of an unbalanced fluid pressure actuated valve for automatically returning the individual levers to saws up position provides a simple means of raising the saws after the individual levers are released from the lock afforded by the springs 51, and also permits the use ol but a single connection between cach individual lever and its valve.

By forming the portion of the connector 'Z5' which passes over the guiding,` pulley 85 of a highly flexible connecting material, the

to the. valve is permitted. lt has been'lound that` by guiding a piano wire suoli as 'it 1S desirable \to use in this. type of equipment,

over a pulley of very' small diameter, the

small radius of the bend in the wire and the constantshifting of the bent portion over the pulley, causes the wires to break. With the use ofV chain or similar" connector at the point of coaction of the operating connection with the pulley 85,y this undesirable breaking of the connector. is eliminated. The provision of a pivot 99 for the bracket 98 having its axis substantially in line with the valve 95, in conjunction with the use of a bell crank 74, pivoted upon the bracket 79 105 having its pivot 97 substantially in line with the `connection 50, permits location of the sa'w -actuating cylinders at any desired angle relative to the central point of control. lt should also be noted that the various ellements of the equipment hcreindisclosed are made interchangeable so tar as possible in order to reduce cost of' manufacture as'well as to facilitate furnishing of repair parts.

It shouldbe understood .that it is not desired to be limited tothe exact details-ot construction shown and described, for obvious modifications will occur to a person "skilled in the art.

It is claimed and desired to secure by Letters Patentfr .l 1. In combination with a table, a plurality of saws movable into and out of cutting position relative to. said table, and means for effecting successive setting of said saws.

2. ln'combination` with a tablc,`a plurality of saws movable into and out of cutting position relative to said table, and means for effecting successive setting' of said saws into either of said two positions. 13@

saws into either oit said two positions,

means i'or edecting successive setting of said SWS.

y-l-. ln combination with a table, a plurality oit-saws movable into and out of cutting position relative to said table, individual means for normally setting each of said saws into either of said two positions, and means for effecting successive setting of said saws into either of said two positions.

5. ln combination with a table, a plurality of saws movable into and out oi. cutting position relative to said table, individual means for normallysetting each of said saws into either ci said two positions, and means for eHecting either successive collective or successive' select-ive setting oit said saws.

6. lln combination with a table", a pluralitiT of saws movable into and out of cutting position'relative to said table, individual means for normally setting each olf said saws into either of said two positions, and means for ell'ecting either successive collective setting of all of said. saws out of cutting position, or successive selective setting of said saws into either of said two positions.

7. ln combination with a table, a plural- -ity oi saws movable/into, and out of cutting position relativeA to said table, and a master lever for' effecting rapid successive setting of said saws.

S. ln combination with a table, a plurality of saws movable into and out of cutting position relative to said table, individual levers for normally setting each of saidsaws into either of said two positions, and a master lever for etlecting successive setting of said saws.

ln combination with a table, a plurality ci saws movable into and out of cutting position relative to-said table, fluid pressure actuated means for moving said saws into one of said two positions, controlling means it'or said fluid pressure actuated means, and a second iiuid pressure actuated means tending to maintain said first mentioned)Fluid pressure actuated means in a position corresponding to out of cutting position of said saws.

l0. ln combination with a table, a saw movable into and out of cutting position relative to said table, fluid pressure actuated means for moving said saw into one ot said two positions, a valve :tor controlling said tluid pressure actuated means, means `for actuating said valve, and means tor establishing unbalanced tluid pressures on said valve tending to maintain said valve'open to pressure.

ll. lin combination with a table, saw movable into and out ot cutting position relative to said table, fluid pressure actuated means for moving said saw into one ot said two positions, controlling means tor saidliluid pressure actuated means, actuating means for said controlling means, a single flexible connection4 liior communicating motion from said actuating means to said controlling means, and fluid pressure vactuated means for moving said controlling means to a position to which corresponds 'out ot cutting position of said saw when the end ot said tlexible connection adjacent to said actuating means is moved toward said controlling means.

12. ln combination with a table, a saw movable into and out ot cutting position relative tosaidtable, tluid pressure actuated means tor moving said saw into one et said two positions, controlling' means for said Huid pressure actuated means, actuating means yfor said controlling means, and a single flexible connection for communicating lmotion from said actuating to said controlling means, said controlling means being movable by duid pressure tor maintaining said Flexible connection taut.

13. ln combination with a table, a saw movable into and out o'f cutting position,

relative to said table, iluid pressure actuated means for moving said saw into one ot said two positions, controlling means 'tor said fluid pressure actuated means, actuating means for said controlling means, connection for communicating motion from said actuating to said controlling means, and. tluiol pressure actuated means Jfor maintaining said connection taut at all times. I

lll. ln combination with a table, a saw movable into and out et cutting position relative to said table, fluid pressure actuated means or moving said saw into one oit vsaid two positions, controlling means for said Huid pressure actuated means, duid pressure actuated means tending to maintain said controlling means in a position-to which corresponds out of' cutting position of said saw, actuating means 'for said controlling means, 'and a single tlexible connection for communicating motion trom said actuating to said controlling means.

ln testimony whereof, the signature of the inventor is ailixed hereto in the presence of two witnesses.

WllLLlAll/l lLlEBElt.

Ron. E. Storm.

llll

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