US1116301A - Trimmer-saw. - Google Patents

Description

W. H. LIEBER.

TRIMMER SAW. AIPLIGATION FILED 1118.17, 1913 Patented Nov. 3, 1914.

2 SHEETSSHEET 1.

Patented Nov. 3, 1914.

W. H. LIEBER.

TRIMMER SAW.

APPLICATION FILED P33111913.

I l/Ill 2 SHEETS-SHEET 2.

N E l l T :3 0

out of cutting position.

UNITED s rirrns WILLIAM H. LIEBER. OF MILWAUKEE, WISCONSIN, ASSIGNQR/BY MESNE ASSIGN- MANUFACTURING COMPANY, A CORPORATION OF msn'rs; To ALLIS-CI-{ALMERS DELAWARE.

earnn r ornics.

TRIMMEHrSAW.

1 all [Flu/m it may concern Be. it known that I, VILLLLH ll. LIEBER, a citizen of the United States. residing at hlilwaultee. in the county of Milwaukee and State of \\'isconsim have. invented a certain new and useful Improvement in Trimmer- Saws. of which the following; is a specification.

This invention relates to improvements in the constructionof saw mill machinery. and particularly to improvements in apparatus for controlling the. positions of a plurality of trimmer saws or similar devices.

An object of the invention is to provide a device for permitting either independent.

selective or collective positioning of a plurality of trimmer saws. or similar devices. hich is simple in construction and etlicient in operation.

Some of lic'tcatures disclosed but not claimed herein are claimed in application To provide a device for perniitting eithcr' individual. selective or collective. control of the positions of a plurality of saws irrspective of the positions of prior setting of the individual. saws at the time such actuation desired.

To provide means for permitting simultaneous collective positioning of all the saws either into or out of cutting position.

To prov de means for automatically returning the master actuating means to a prcdeterlnincd or mid position after either a selective or collective actuation of the saws has been made.

To provide an actuatingwhich the individual levers construction. thus iii-airing changeable with each other the number of (lill'crent parts mechanism in are similar in them inter and reducing to a n'iinimuni.

To provide a fluid. pressure actuated means for positioning trimmer saws. in which the amount of fluid utilized is duced to a minimum.

To provide inc-ans .vhercbv upon failure of the. llnid pressure in the suppl line. the saws uill automati-izally more and remain This feature is important as it eliminates-the uiuiesirablo dropping of i-vlu-n the pressure fails. In prior devices using retaining hooks. and

Specification of Letters Patent.

Application filed February 17, 1913.

Patented Nov. 3,1914.

Serial No. 749,539.

in which all saws not hooked at the time of pressure failure move into cutting position, the saws must be manually raised and hooked after pressure failure.-

lo provide means for automatically returning the controlling mechanism of the saw positioning means to saws up position when the fluid supply fails.

To provide an actuating means for the saw positioning controlling mechanism in which a single flexible connection may be employed to control the admission of fluid under pressure to each of the individual saw positioning means.

To provide a fluidadmission means for each of the sawpositioning means. which is simple and durablein construction and ethcicnt in operation. I

To provide an efiective means for cushioning the saw positioning means: v

A clear conception of an embodiment of the invention may be had by referring to the drawings accompanying and forming a part of this specification in which like reference characters designate the same or similar parts in the various views.

Figure 1 is a transverse vertical section i? rough a trinnner saw control. actuating device with the collective and selective actuating means in mid position. 2 is an end view of a trimmer saw position control actuating device showing the' collective actuating means in saws up position. F1'g.

tion through a trimmer saw position control actuating device showing the selective actuating means in operation. Fig. 5 is a front view of a fragment of the trimmer saw position control actuatingdevice, partly in section. Fig. (i is an end elevation showing the general arrangement of the trimmer saws and positioning mechanism therefor. Fig. 7 is a plan view showing the general arrangement of the saw positioning mechanism. Fig. 8 is a transverzvertical section through. one of the individual saw po sitioning nu'clianisms. Fig. 9 is an enlarged transverse. vertical section through one of the individual saw position coutrciling alves, showing same attached to a frag mcnt of a saw positioning cylinder. Fig. 1.0 is a transverse horizontal section through add I one of the individual saw position controlling valves, the section being taken along the line X X of Fig. 9. a

In the device disclosed in the drawings, the saws are brought into cutting positlon by means actuated by fiuid pressure to lower same and are thrown out of cutting position by spring means acting to raise same. For the purpose of explanation the positions corresponding to into and out of cutting positions will be designated as saws down and saws up position, respectively. It should be understood, however, that these terms are correct only when applied to an overhead trimmerand it is not intended to limit. the application of this invention to that type of trimmer by the use of these terms. The term collective as used in the present specification designates the simultaneous operation of all saws controllable by the mechanism. The term selective designates a predetermined allotment or portion of the total number of saws commonly known as the slasher saws. The collective saws therefore include the selective or slasher saws as well as the. intermediate or non slasher saws.

The ordinary trimmer sa-w equipment generally includes a lumber conveying table 62, upon which the material to be trimmed is automatically fed to the saws 5G by means of suitable conveying mechanism, see Fig. (1. The individual saws 56 are supported upon arms 57 which swin about pivots 64. A common driving sha. t 60 carries a series of driving pulleys 59 which are drivingly con nected tothe saw pulleys 61 by means ofbelts 58. The location of the pivots (34 of the arms 57 is such that with the saws 5G in saws down position, the belts #38 are taut, with (the saws 56in saws up position. tlie 'belt's 58 are flexed. The individual saw positioning means disclosed as cylinders 51, see Figs. 6 and 8. a re fixed to a beam 65 above the saws 5G by means of cap screws 95. A piston fit; is re- -ciprocable within each of the cylinders 51 and is capable of imparting motion to its respective saw 56 through a piston rod 51 and an adjustable connection 55, the former of which is guided in a suitable bearing 1tr formed in the cylinder 51. A cup leather packing 98 is sccumd tothc piston 96 by means of a nut and follower 1011. contact b tween the pa king ailtltifliiwuwri ing surface of the cylinder 51 being d laintained by the use of an expander ring' tlti. l\ helical compression spring 517 coat-tsi'tllith it low r end against a surface of the cyliiul fr '1, and

of the piston 96. This spring 9T trnds at. all times to force the piston 91 and its revcnt 101. permits escape of air from the spring chamber below the piston 96.

the upper end of its stroke consists of a holet), preferably drilled into the 0nd of the cylinder 51 and connecting with the port 72 through a smaller drilled hole til. The hole (39 connects with the extreme end of the interior of the cylinder 51 through a transversely formed slot or hole 90. The ends of the cylinder 51 and hole 6.) are inclosed by meansof a plate 92 which is clamped between the cylinder 51 and the beam (,5 to

prevent leakage of working fluid from with in the cylinder 51. valve 70 permits the free passage of fluid from the port. 72 through the holes 81, G9, to the interior of the cylinder 51. but does not. permit the return of fluid from the cylinder 51 to the port 72 through tl'icsc holes.

The saw position controlling valve boxes are secured to their respective cylinders 51 by means of studs 73. see Fig. 10. Each of the boxes 52- has annular admission and exhaust chambers (38, 8G,.for nml substantially cmu-cntric with their respective admission "and exhaust valve pistons '76 78. The admissi n. valve piston 76 arries a pup pet valve 84. which preferably c nsists of a removable leather disk. 'lhe exhaust valve piston 78 carries a. similar poppet valve 85. The admission and exhausty'flvc pistons 70; ?8. arerig'idly but romovanly conucctcdby nicans of a valve; stem :75.

fluid admitted through the port Gt: will be substantially balanced in its effect upon the valve. around the entire periphery thereof. The exhaust valve piston TR -on trols the exhaust ports 87 which-arc directed from the puppet valve c ntrolled exhaust port 91 toward the chamber 86. and are uniformly spaced around the piston 78. The valve seats 74394. of the puppet valvo-- 84. 85. are formed as annular ridges and surround their respective admission and exhaust ports 71, 91. The ports 71, 91. (Ollfltft with the common chamber so which puiununicatcs with the interior of tYl- :-:a\i -'i|Silimiing cylinder 51 through the po'rt. 79. Th1- annular recess 9 formed ailja cnt t0 the; seat 91, is onstantly in com munication with the cxllztllst chamber 86. through a small drilled port. 88. The fluid 3 pressure supply header or pipe 53 is conspcctivc saw 50 into saws up position. The,

: plcs 67. The individual exhaust chambers The nonreturn check The admission valve piston t controlsthc admission ports too 869i the boxes 52, communicate with the atmosphere through ports 82. The combined piston and puppet valve is preferably vertically disposed and 15 provided with a spring seat- ?9 at one of its ends. The helicai compression spring 83 coacts between the seat 79 of the valve and the valve box 52, and normally tends to retain the valve in its lower or saws up osition. The upper extremity of the combined piston and puppet valve is provided with an I-bolti77, which forms means for connecting the valve with its corresponding flexible connection 19 leading to the actuating means. i

The saw controlling valve actuatirig device consists of a series of selective or slasher saw levers 12, and a series of similar but revcrsely arranged intermediate saw levers 13, see Figs. 1 to 5. The levers 12, 13, are connected with the controlling valves of their respective saws 56 by means of the flexible connections 19 which pass through and are secured to the levers 12, 13 by means of slack adjustment permitting means or nuts 29. The connections 19 are guided to permit proper and free actuation of their respective valves by means of guide wheels or pulleys 20, 63. The pulleys 63 are mounted u on suitable brackets 93 which are secure to the beam 65. The pulleys 20 are mounted in suitable brackets which are angularly adjustably secured to the base plate 17 by means of swivels The flexible connections 19 are led in any convenient man nor from the controlling valves to their respective levers 12, 13, which are stationed in the operating cage 50 of the' mill.

The levers 12, 13 are mounted upon a common shaft 11, which is supported in end bearings 16, 33. secured 'to the base plate 17 by means of cap screws 12. Tho upper ends of the levers 13, are provided with finger grips below which the designat'ing numerals of the saws are preferably placed. The selective saw levers 12 are pro vided with projecting fins 120, which extend away from the operator, while the corresponding similar fins 130 of the. intermediate levcrs 13 extend toward the operator. The levers 1:2. 1'3'have downwardly extending projcctionsi21f3l, respectively, which, with the levers 12, 13, in saws down position. coact in recesses formed in the leaf springs 29. The levers 12, 13 are identical in structure and differ only in their relative mounting with respect to the shaft 14. With the levers 12 13, in saws down position, the leaf springs tend to retain them in such position with a holding effect which is somewhatless'than' the normal pull exerted' upon t-hclevers 1'2, .13, by the springs 83 through the valves and flexible connectionslfl j' j heanc ter actuating device wonsists of mounted to swing upon the shaft 1-1. These clutch levers 11 are automatically returned to the predetermined or mid position upon release of same by the operator, by means of springs 15, the ends 35, 36 of which normally coact with adjacent surfaces formed on corresponding sides of lugs 34, 37, projecting from the levers 11 and bearings 33., respectively. If the lovers 11 are moved in a clockwise direction, see Fig. 2, the spring ends 35 tend to return them to mid position by exerting pressure against the projections 34. As the levers 11 are moved in an anticlockwise direction, see Fig. 3, the spring'cnds ill: tcnd to return them to mid position by exerting pressure against the projections 31.

The clutch mechanisms of the levers 11 consist of wedge blocks 21), 38, carried by the lower ends of the rods 40. the upper ends of which carry actuating plunger-s 27.

-'lhc plungcrs 27 are normally retained in their uppermost position by means of helical compression springs 41 which are incloscd within the handles of the lovers 11. The wedges 26 of the wedge blocks normally conct with recesses 46 formed in the collective control actuating arms 24-. \Vith the plunger-s forced into their extreme lowest positions as disclosed in Fig. 4, the wedges 38 of the. wedge blocks are forced out of engagement with the recesses 46 and into coaction with the recesses 28 of thc slasher or collective control actuating arms The collective control actuating arms 24 are connected by means of cross rods 9, 10, which are capable of being swung about the axis'ot' the shaft 14 along a. cylindrical sur-' face ,which lies beyond the upper ends of the fins 120. 130. The selective control actuating arms 25 are connected directly by means of the cross rod 8 and indirectly by means of the cross rod 7. The levers 6 are pivoted to swing upon stationary pivots 30, which on fixed to the bearings 16. The upper ends of the levers G are connected by means of tho cross rod 7,"whilc the lower ends thereof are slotted to receive the wearing blocks 39. The blocks 39 are pivotally mounted upon pins 32 secured to the arms During the normal operation of the device and at such timcs when the collective and selective p xiitioning of the saws 56 is not desired. the master actuating device is in the position shown in Fig. 1 and actuation of the individual levers 12, 13 is unrestricted by the or ss rods 7, 8, 9, 10. l-Vith the mechanism this positioned. any one or more of the individual saws 56 may be brought into cutting or saws down position by pulling its corresponding lever 12, 13, toward the operator. A pull on one ofthe levers 1Q, 13,

a pair of master clutch levers 11 which ar 'gi acts through. its corresponding connection 19 to raise the combined piston and puppet valve 76. 78, S}. 85, connected therewith, positioning the valve as indicated in Fig. 9 and compressing spring 83. Fluid under pressure is then free. to pass fromthe supply header 53 through the inlet pipe 67, chamber (38, ports 36,71, chamber 80 and ports 7 81. no. to the interior of the saw posing cylinder 51. I The admission of air under pressure tothe chamber above the iston forces the piston and its correspondin sir-toward the table 62 and position; against thefajction of g into cutting the spring )7. which is meanwhile com pressed. VJ

\Yith the controlling valve in; tion indicated in Fig. 9. the area of the puppet \alve S-lwhich is eivposed to fluid pressure is eiaisiderabl greater than the eerres n nding pressure exposed area of the puppet valve so. Assuming the difference in pressure upon these pressure exposed surfaces oi th puppet alves to be 20 pounds. and that the spring 83 exerts a downward lil'ttlbilllt of :25 pounds. it will then he necessary for the leaf spring 22 of the corresponding saw aetlniting lever 12, 13, to ex ert a lever locking or holding pressure which is in excess of the diil'erenee between the Hnbalaneed lluid pressure on the valve and the pressure exerted by the spring 83. For convenience it may be assumed that the lever Inching pressure is 10 pounds, in which ease the excess or aet'ual unbalanced holding" eil'eet oi the spring 22 upon the lever 12. {I while in saws down position, will be 5 pounds. The. above figures are assumed merely for purposes of description and it is not intended to limit the invention to an ligures assumed tor such purpose.

ll it is desired to raise the saw 56 out of cutting position. it is neeessanv to move the lever l2. 1?; ol' the saw 56 whiel'i it is desired to position. in a clockwise direction. thus brealring the lork between the end of the lever 11?. 1 and the spring 22. This release oi the locking pressure of the spring 352 immediately permits the valve spring 3 to become eth'rtire in antouuitieally lowering or closing the valve. The automatic closing ol' the naive is accomplished by the exces of 7 ounds downward pressure exerted by the spring hi}, above the 20 pounds unbalanced thud pre sure .upon the puppet "the posivalves t-l. 3. s tln ombined piston and puppet val H 81. woe downwardly. it closes oil the thud pressure supply through the ports t t'. f i nult; .uously with the closlease of the fluid press 'ue from above the piston 96;, the spring J7 becomes effective the. piston nndpnppet valve T5. 85.

in raising the piston and its corresponding saw 56 to saws up position. When the piston 96 in its upward travel passes the port 72. it confines air in the cylinder chamber above the port 72, thus forming an etfective cushion for the upper end of the piston stroke. The piston 96 should not be permitted to travel beyond the port 72 so as to establish communication between the port 7-! and the chamber below the piston, sinre such a connnunieation would permit high pressure. fluid to enter the chamber below the piston rather than to pass through the cheek alve. to the upper piston chamber. Sim-e the upward pressure exerted by the spring 5)? increases as the piston 96 is lowered, the/desired cushioning efi'ec't for the lowgfy'flil' of the piston 96 will be produced in thespring itself.

If itis desired to manually operate the sans 5t collectively to raise same, this may be done by moving one of the master actuating levers 11 into the position shown' in Fig. 2. Upon movement of a master lever 11 in a clockwise direction, the plunger 27 thereof remaining undisturbed, the wedge 2o thereof engages the recess 46 of the corresponding arm 2-1, causing the arm to move in a clockwise direction. of the arm 24 causes the cross rod 10 to engage all of the individual levers 12, 13, which are not in saws up position, and to move these levers into saws up position. l'pon release of the lever 11 by the operator, the springs 15 automatically return the levers 11 and arms 24 to mid position.

l'l it is desired'to operate the saws 56 collectively to lower same, this may be done by moving a master actuating lever 11 into the position shown in Fig. 3. Upon movement of.a master lever 11 in an anti-clockwise direetion, the plunger 27 thereofremaining undisturbed, the wedge 26 thereof engages the recess 46 of the corresponding arm 24'. causing the arm 24 to move in an; anti-clockwise direction. Such movement of the arm 24 causes the cross rod 9 to en; gage all of the; individual levers 12, 13. which are not in saws down position, and to more these levers. into saws down position. Upon release of the lever 11 by the operator, the springs 15 automatically return the levers 11. and arms 24 to mid position. The collective lowering of the saws may be desirable when the material is to be cut into short uniform lengths equal to the distance between successive saws.

if it is desired to operate the selective or slasher saws 50 as in cutting lath lengths. it is necessary first to press the plunger 27 of one of the master actuating levers 11 donnward by use of the thumb, and with F the plu'n n-r 27 in such position, to move the lever H to the position indicated in Fig. 4.

"During the downward pressing of the Ill the total! pressure of plunger 27, the wedge 26 is Withdrawn from the recess 46, and the wedge 38 is simultaneously brought into engagement with the recess 28. lVith the wedge 38 thus positioned, anti-clockwise movement of its lever 11 will cause the arms 235 toinove, carrying with them the cross rod 8. The cross rod 8 during its anti-clockwise movement automatically engages the fins 120 of the slasher levers 12 which are not in saws down position, and places these levers into saws down position. Simultaneously with the movement of the arms 25 in an anti-cloehvise-direction, the levers 6 are swung about the pivots30 by means of the pins 32 and blocks 35) which coact with the slots at the lower ends of the levers 6. The moven'ient of the cross rod 7 connecting the upper ends of the .levers 6 resulting from the motion imparted the wedges 26 are automatically snapped into engagement with the recesses 46. Disengagement. of the wedges 38 before the lovers 11 reach the mid position, is prevented hy suitableguides formed on the arms 24. The arms 24 during selective setting of the saws 56 are prevented from moving by the eoaction 'ot the rod 10 "with the locked levers 12.

-It should he noted that by reversing the respective positions of the lovers 12, .13..

upon the shaft 14, the saws may readily be transformed to operate as slasher or intermediate saws from prior operations as 'intc-rmediatc or siaslu-r saws, resp ctively. it should also he observed that the levers 12.

13 are exactly alike and that tiuvarious other elements of the device are also dupli- I it for any reason the pressure in the sup ply header 53 should fail, either temporarily arrangement is that upon reestablishment of the fluid pressure within the header 53, the saws 56 will remain in saws up position until otherwise positioned by the operator.

The location. of the supply header 53 as near to the positioning cylinders 51 as possible, assures very quick action of the device and reduces the amount of fluid under pressure necessary to position the saws to a minimum. The use of mechanical means for raising the saws, eliminates the necessity of providing means, such as a hook, for keeping the saws 56 out of cutting position in order to keep the belts flexed. Such construction furthermore requires the admission of fluid under pressure to the positioning cylinders 51 only during the timethat the corresponding saws 56 thereof are in cutting position. As the relative time during'which the saws 56 are. in cutting osition is consideralily less than that in w ich they are out of cutting position, this feature of the present invention assists in reducing the amountof fluid under pressure required to operate the device, to a minimum.

The use of but a single flexible connection 19 for connecting each of the individual actuating devices with its respective controlling valve, simplifies the construction and prevents unnecessary obstruction of the operators view of the various saws 56.

It should he understood that it is not-desired to be limited to the exactdetails of construction shown and described, for ol vious modifications will occur' to a person skilled in the art.

It is claimed and desired to secure by Letters Patent,

1. In combination with a table, a plurality of saws movable into and out of cutting posi- .tionrelative to said table, actuating means for efi'ecting selective setting of StlKiStLWS, and means for returning said actuating means to a predetermined position.

2. In combination with a table, a plurality of saws movable into and out of cutting pr sition relative to said table. actuating means for ejl'ecling colle tivesetting oi said saws,

fand means for returning saith-actuating or permanently, as in closing down the mill at night, the. unbalanced pressure. of 30 pounds on the puppfct valves 84. ml those sawsavhich are m (,Htilflfl position at the time,'\vill he autormltirahly destroyed and springs 33 c rresponding to such revs. will the corresponding individual lev rs l2, l3.

pounds of (he? means to'a predetermined position.

3. in combination with a tahlc,a plurality of saws movahic into and out of cutting position relative to said tahle individual means for normaliy setting eat-h oi" said saws in either of said two positions actuating 1 ncaiis {or vti'erting selective setting of said immediately heroine. effective in releasingsaws 56 into saws up position. and at the a same time closes off the pressure inh-l ports l I l saws, and means for returning said actuai ing means to a predetcrminod position.

4. lnrt'mhination with a tal le,a plurality of sawsmovable into and out of cutting position relative t said table. individual means for normally settingra h olsaid saws in either ol said two position common actuating: means for cilia-ting collective and selectivesetting of said saws, and means for returning said actuating means to a predetermined position.

5. In 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 said saws into either of said two positions, a master lever for effecting collective or selective setting of said saws, and means for automatically returning said master lever to mid position.

6. In combination with a table, a plurality of saws movable into and out 0,! cutting position relative to said table, actuating means for effecting either collective or selective setting of said saws, and means for returning said actuating means to a predetermined Position.

7. In combination with a table, a plurality of saws movable into and out of cutting position relative to said table, fluid pressure actuated means for moving said saws into cutting position, controlling means for said fluid pressure actuated means, and means for automatically returning said controlling means to a predetermined position upon failure ofthe actuating fluid pressure.

8. In combinationwith a table, a plurality of saws movable into and out of cutting position relative to said table, fluid pressure actuated means -for moving said saws into cutting position, controlling means for said fluid pressure actuated means, means for autdmatically returning said controlling means to a predetermmed position upon failure of the'actuating fluid pressure, and mechanical means for moving said saws out of cutting position.

9}.In combination with a table, a saw movable into and out' of cutting position relative to said table, fluid pressure'lactuated means for moving said saw into one of said twojpositions, controlling means jor said fluid pressure actuated means, actuating 'meansjor said controlling means, a} single flexible connection for communicating motion from said actuating to said controlling means, and means acting through said conggtion for returning said controlling. means td a predetermined position upon release of said actuatin means. 1

10. In com ination 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 of said two positions, a combined piston iandtpuppet valve for controlling said-fluid pressure actuated means, means tending automatically to force said valye in one direction and to move said saws out of cutting position, and

means for moving said valve in the'opposite direction whereby said saws are moved into 'cuttin position.

. 11. n combination with a table, a saw movable into and out of cutting position relative to said table, fluid pressure actu-'- moving said saws out of cutting position,

and means for cushioning said saw moving means.

13. In 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 of said two positions,.controlling meansfor said fluid pressure actuated means, actuating means for said controlling means, a single flexible. connection for communicating mo tion from said actuating to said controllin means, and means for moving said contro ling means to a position to *which corresponds out of cuttingposition of said saw, when the endof said flexible connection ad; jacent said actuating means is moved to-' ward said controlling means.

14. In 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 ofv said two positions, controlling means for said fluid pressure actuated means, actuating means for said controlling means, and a single flexible connection for communicating motion from said actuating to said controlling means, said controlling means being movable for maintaining said flexible connection taut and for returning said controlling means to a predetermined position upon releaseof said actuating means.

15. In combination with a table, a. saw movable into and out of cutting position relative to 'iaid table, fluid pressure actuated means or moving said saw into one of said two positions, controlling means for said fluid pressure actuated means, actuating means for-said contiolling means, *a single flexible connection for communicating motion from. said actuating to said coutrolling means, and means for madntaining said flexible connection taut at all times said means tendih to return said actuating means to a pre etermind position.

16. In combination with in. table, a-saw movable into and out 'f cutting position relative to saidtaltle, u-id pressure actuated means for moving/said saw into one of said two positions, co trolling means for said fluid pressure ,a uated means, automatic means tendin g ifit all times to move said controlling means in a position to which corresponds out of cutting position of said saw, and actuating means for said controlling means.

17. In combination with a table, a saw me: able into and out of cutting position relative to said table, fluid pressure actuated means for moving said saw into one of said two positions. controlling means for said fluid pressure actuated means, 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 flexible connection for communicatiug motion from said actuating to said controlling means.

18. 111 combination with a table, a plurality of saws movable into and out of cutting position relative to said table, actuat ing means for effecting setting of at least one of said saws into either of said two positions, and means for automatically returning said actuating means to a predetermined position.

19. In combination with a table, a saw movable into and out of cutting position i relative to said table, fluid pressure actu- A ated means for moving said saw into one of said two positions, controlling means for said fluid pressure actuated means, actuating means fol said controlling means, and a single flexible connection for communicating motioh from said actuating to said controlling means said controlling means being automatically movable to maintain said flexible connection taut at all times.

20. In 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 of said two positions, a valve for controlling said fluid pressure actuated means, means tending automatically to move said valve in a direction to which corresponds out of cutting position of said saw, and means for moving said valve in a direction to which corresponds into cutting position of said saw.

In testimony whereof, the signature of the inventor is aflixed hereto in the presence of two witnesses.

WILLIAM H. LIEBER.

Witnesses G. F. De WEIN, Ron. E. SToLL.

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