US1478575A - Abrading or polishing machine - Google Patents

Description

Wee. 25, E923.

, C. L. MATTISON ABRADING 0R- POLISHING MACHINE 5 Sheets- Sheet J Filed sept, 25, 1921 @een 25 H923,

c. L.. MATTISON ABRADING OR POLISHING MACHINE Filed sept. s. 1921 `5 sheets-sheet 2 Dm. Z5, E923.

v C. MATTISON vABRADING on POLISHING MACHINE Filed Sept. 23. 1921 y 5 Sheets-Sheet 5 MUA INVENTQR QL.. Mwvnom Dec. ,25, m3. Lwss C'. L. MATTISON ABRADING OR POLISHING MACHINE Filed Sept. 25. 1921 5 Sheets-$h6et 4 nl l lil OL. MATl-ssoN TTY'S.

ec. 25, w23. 3,47%,575

C. L. MATTISQN BRADING 0R POLlrsHING lMAGHINE:

5 Sheets-Sheet 5 NVENTOR C. LQMATMSON Patented Een. 25, i923.,

initie CARL LAWRENCE MATTSON, OF RQCKFOBD, IJLINOIS', -ASSGNOR T0 MATTISON MACHINE WORKS, OF ROCKFOBE, ILLINOIS, A CORPORATION OFLLNOS.

ABRADNG 0B; POLISHBNG JJACHENE.

App'licatonled September 23, 1921.

To @ZZ Lv/7mm it may concern Be it known that l, CARL LAWRENCE MAT- 'risoN, a citizen cit the United States, residing' at Rockford, in the county of `Winne bago and tate of Illinois, have Vinvented certain new and useful Improvements in Abrading or PolishingA Machines, of'which the following is a specification.

My invention relates to ab-rading machines or polishing machines, and refers more particularly to that type in which an endless abrading belt or' polishing 4belt is applied to the work to be treated by means of a reciprocating shoe structure which bears'upon one run of the traveling belt.

They invention of this-application may be considered as covering improvements in the construction and arrangement disclosed in my co-pending application Serial No. 490,- 477, filed August 8, 1921'. ln the structure of this co-p'ending application provision is vmade to unclutch the shoe structure from the reciprocating' band to permit manual application ot the shoe structure against the abrading belt'. ln this arrangement, however, the entire shoe structurey together with the supporting rail and the rail supporting mechanism must be moved in manually applying pressure against the belt. rlhe general object of my present invention is to eliminate all unnecessary weight and resistance, and to produce a construction, arrangement and operation which will permit manual adjustment oi: the pressure to be accomplished rwith greater ease, precision and efliciency. More in detail, the main object of my invention is to provide a shoe structure lmovable as a' whole on a vertically movable rail but having a comparatively light shoe part movable independentlypot the rail to be readily and accurately applied by hand with the desired pressure engagement against'the abrading belt.

My' improved shoe-structure comprises main-part or carriage which receives the rail, and a comparatively light shoe part, and another important object' or' 'my inventionis to provide improved-ineans for Vsuspending said slioeipaitfbelow the' carriage part for vertical reciprocation' relative' thereto. Y

Another impo-rtantobject ofinyv invention is to provide a clutch member on' the shoe part for' connect-ing the shoe' structure with a traveling member, together' with me :tor-v seriai no. 502,612

operating the clutch member and controlling the vertical reciprocation oft the shoe part'.

Another important object of the invention is to provide a hand lever on the shoe structure connected with the clutch member and the shoe part to control the operation' and adjustment thereof.

Another important objectof the invention is to produce improved means for locking the various parts in normal position when the shoeV structure kis being automatically reciprocated.

ln the accompanying drawings l Vhave shown by way of example a machine which represents the preferred embodiment of my invention but' it should be understood that the following detailed description of this particular embodiment is given only for the sake of imparting an understanding of the invention, and that l do not intend to limit the invention to the construction herein disclosed but aim to cover all modifications, equivalent and alternative constructions falling within the scope of the appended claims.

ln the accompanying drawings Figure l is a front elevational view off a machine to which my improvements are applied.

Fig. 2 is a plan view.

Fig. 3 is an enlarged front elevational view ot the shoe structure.

Fig. lis an enlargedV side elevational view of the shoe structure with the carriage frame broken away at plane r-l, Fig. 3.

Fig. 5 is an enlarged sectional view on 5 5', Fig. l.

Fig. 6 is an enlarged sectional view on e-c', Fig. i.

7 is a sectional view on plane 7-7,

llig. 8 is a view similar to Fig. 4:, showing y versely exending drive shaft 6, driven through gearing 7 by the motor 8, the shaft having the pulley 9 at its front end over which travels the abrading belt 10, which also passes over the pulley 11 at the right end of the machine, said pulley being on the transverse shaft 12 which is bodily adjustable 'by means of suitable mechanism 13.

At its rear end the driving shaft 6 has the pulley 14 connected by belt 15 with the pulley 16 on the counter-shaft 17. The shaft 17 transmits rotation to the shaft 19 through the gearing 18, and by means of suitable clutch mechanism 20 controlled by lever 20.

`This shaft is connected with the crank shaft 21 either through the gearing22 or the gearing 23. At its rear end the shaft 21 has the crank disk 24 having the crank pin 25 which is connected by the connecting rod 26 with the gear sector 27 at the left end of the machine, there being a similar sector 28 at the right'end of the machine, the 'sectors being` connected together by the connecting` rod structure 29. The sector 27 is secured on the rear end of the shaft 29 journaled in the frame 30, and in said frame below said shaft is journaled the shaft 31 which at its rear end carries the pinion 32 meshing with the gear sector 27, the shaft 31 at its front end supporting the disk 33. The sector 28 is secured on the rear end of the shaft 34 in the bearing frame 35 which frame also journals the shaft 36 having the gear pinion 37 thereon meshing with the sector 28, the shaft 36 at its front end supporting the disk 38. Stretching between the disks and secured thereto is the band 39 which has clamped thereto the abutment frame 39 by means of which the shoe structure S may be connected -with the band to be recnprocated therewith. The reciprocation of the band f is caused by the gear sectors which are oscillatedby their connection with the crank mechanism 24, 25.

The supporting mechanism for the shoel structure is clearly shown in Figs. 1, 2, 5 and 6. A number of brackets 40 secured on the machine top 2 support upper and lower rods 41 and 42. ln front of these rods and parallel therewith are the rods 43 and 44 connected by vertical links 45. Horizontal links 46 connect the rods 41 and 43 and horizontal links 47 connect the rods 42 and 44. The front links have L-sbaped extensions n 48 which at their front ends are secured to a rail beam 49 of cross section and extending lengthwise of the machine at the front thereof and above the lower run of the abrading belt.

0n this rail beam the shoe structure is reciprocated. To balance the weight of the rail beam and shoe structure thereon, counterweights 50 are provided, these weights be ing adjustably secured on the stem 51 ofthe horizontal links 52 detachably engaging the upper rods 41 and 43 as clearly shown in Fig. 5. By virtue of the parallel link suspension the beam 49 will always be in a vertical plane during up and down movements thereof. I .e

rFhe shoe structure comprises a carriage part C and a shoe part S.l The carriage frame of the shoe Vstructure is of C shape cross section in order that it may span the rail 49 and clear the rail supporting brackets 48 which are extensions 0f the lower ends of links 45. At its upper corners the frame hasV the housings 61 and 62 for journaling the rollers 63 and 64 for engaging with the sides of the beam anges at the front thereof. Thev carriage can thus freely roll along the rail beam. i

Between the lower roller housings of the carriage frame the block 65 of the shoe part S extends transversely and from the front end of this block an arm 66 extends upwardly in front `of the carriage and has the shaft 67 in its upper end for pivoting the horizontal links 68 and 69 which en# gage on either side of the arm and extend rearwardly. At the rear end these links pivot on the shaft 70 secured in the bracket 71 on the carriage frame between the upper roller housings 53. vertically below the shaft 70 and extending rearwardly from the housing extensions are the threaded lugs 72 and 73 (Fig. 9) which receive the pivot screws 74 and 75 on which are pivoted at the rear ends the links 76 and 77,

these links engaging between the blocks 65 and the inner sides ofV the housing extensions Vertically below the shaft 67 the links 76 and 77 are pivoted by screws 78 and 79 to the block 65 at the sides thereof. rlhe links 76 and 77 extend a distance toward each other and then forwardly as vclearly.shown in Fig. 9 to formV the op-V posed walls S0 and 81 which have the longitudinally extendingslots 82 andr 83v through which extends the bolt 84. Between the walls 8O yand 'S1 are the spaced apart cam wings 85 and 86 which extend from the head 87 of the operating' lever 88, the bolt passing through the wings and serving as a pivot for the lever structure.

rlhe block 65 has the transversely extending passageway 89 (Fig. 7) in which the bar 90 is' reciprocable, the bar at its afwas-75 rear end having the upper and lower fin gers 91 and 92 for co-operating with the clamp. 39 to clutch the shoe structure to the reciprocating band 39. Secured to the fronty endV of the bar by suitabley coupling or connecting mechanism 93y the extension 9.4 which ts in between the cam wings 85 and 86 of the lever structure. The extension at its outer end is enlarged and has the arcuate slot 95 whose radius center is the axis of the pivot screws 74 and 75, the slot receiving the bolt 84.

Extending downwardly from the block 65 are the front and rear lugs 9G and 97 which support the trunnion screws 98 and 99 which engage with they piece 100. At its oppositev sides this piecey is engaged by the trunnion screws 101 and 102i which are supported in the lugs 103 and 104 extending upwardly from the shoe. 105, the shoe having thus universal pivotconnection with the block 65 so thatV it can freely and accurately engage against the top of the abrading belt 100 to accurately hold this belt against work to bev surfaced. Compression springs106 are interposed between the shoe and the block 65 which tend to keep the shoe uniformly pressed against; thebelt, the springs, together with the universal pivot connection permitting the shoe toy easily givey when` irregularities are encountered in the surface to be treated, thusl avoiding strain in the shoe structure. The shoe detachably supports the shoe plate 107 to which anti-friction facing material. 108 may be secured by means of clamp mechanism 109.

Ther shoe structure as av whole is suppcrted on the rail beam 49 which beam can be raised and lowered to raise or lower theshoe structure as a whole, the beam being always in a vertical plane by virtue of the parallel link connection thereof with the supporting brackets 40. The counterweights are adjusted to tend to hold the beam with the shoe structurev thereon up with the shoe plate out of pressure engagement with the abrading belt. By means of the operating lever 110 the beam with the shoe structure may be readily moved downwardly to bring the shoe into pressure engagement with the abrading belt and the surface to be treated. This operating lever mechanism is fully disclosed inV the copcnding application referred to. rlhe lcver is mounted on the machine frame. at 111 to' swing vertically and shift longitudinally, and in front of this support it passesV through a fitting 112 secured to the uppery rod 43 of t-he link supporting mecha nism so that when the lever is raised'and lowered by its handle 118 the rail beam will be raised and lowered to adjust the pressure of the shoe structure on the work.

The; operatingV lever 11.0V iszused' to control the pressure when the shoe structure is clutched to the reciprocating band. It is, however, frequently desirable to reciprocate the shoe-structure by hand, independently of the band, and to press it against the abrading belt to give extra treatment to work at certain parts. ln the arrangement of the co-pen'din application referred to it is necessary to raise and lower the entire shoe structure together with the rail beam and link mechanism. when adjusting for pressure during manual reciprocation of the shoe structure. ln my improved construction already described herein it is necessary only to move the shoe part comprisingy the block with the shoe 105 thereon, the rail beam andi carriage-part remaining stationary during' pressure application of the shoe part to the belt'. By swinging the hand lever 88 the shoe structure canY first be unclutched from the reciprocating band and then the block 65 with the shoe suspended therefrom may be moved independently in vertical direction to bring the shoe plate into engagement with the abrading belt under the desired pressure. ln Figs. 3, 4 and 5 the lever is shown in its normal position, 'the hand` receiving knob 114 being in position over the links 68 and. 69; Coiledy springs-115` encircling the shaft are secured at one end to the' shaft and at their other ends bear against pins 116011 the upper links 68 and 69, these springs tending to holdy the arm 66 with the shoepart thereon in upper position with the lower links 7 6 and 77 abutting against the underside of the carriage frame as clearly shown in Fig. 3'. vVhen the lever 88 isin normal positionV the flat surfaces 117 onA the cam wings and 86 will be in abutment against the shoulders 118 at the outer ends of the walls 80 and 81, this engagement holding the lever in its normal position. To assist in holding the block 65 in its normal upper position balls 119' may be provided and held inthe pocketsf120 in the cam wings and :pressed therein by the springs 1212 which are held under compression by the screws 122 which thread through the lugs 1-23 formed on the walls 80 and 81. llilhen the lever 88 was swung int-o norma-l position the bolt 84 engaging in they slot 95 caused the bar to be' shifted rearward-ly to bring the lingers 9 1 and 92 into clutching engafrement with the clamp 39 on the reciprocating band so that when` the lever is in E' noi-'mal position the shoe structure will re ciprocate with the band. Then it is desired to unclutch the shoe structure from the rcciprocating bandv the lever 80 is swung downwardly to thel intermediate position shown in Fig. 7i, until the flat surfaces 124 on. the cam *wingsr come into engagement with thev shoulders 125 formed` at the rear ends of the walls: 80, and 81 (Fig. 9) .and such! enga'{ ein'entilocks'- the lever' in its interabrading mediateposition. During downward swing ofthe lever the eccentric cam surface 126 of the cam wings engaged with the shoulders 125 and shifted the bolt 84 forwardly in the slots 82 and` 88 in the walls 80 and 81 with the result that the bar 90 was drawn forwardly to withdraw the fingers 91 and 92 from the clamp 39 on the reciprocating band. )The shoe structure is now free to be reciprocated manually, and uponv further downward movement of the lever 88 the shoe plate may be brought with the desired pressure against the abrading belt. As the lever is swung downwardlythe links supporting the block 65 will rotate on their shafts and screws 74 andV 75 against the force of the. springs 115. During such downward swing the bolt84 travels through the arcuate slot 95 without disturbing the setting of the clutch bar 90. The weight of the lever 88 will counterbalance to some eX- tent the upward exertion of the springs 115 so that very little effort is required to shift the block 65 with the shoe thereon, and the f desired pressure can be applied with precision and accuracy against the abrading belt and thus to the surface to be abraded. The ,extent of vertical movement of the block 65 is controlled by the extent of the slot 95.

l When it is desired to reclutch the shoe structure for automatic reciprocation the lever 88 is raised and the eccentric cam surfaces 127 of the cam wings will then abut against the shoulders 118 to cause the bolt 84 to be shifted rearwardly against the eX- tension 94 so that the bar 90 will be shifted rearwardly to bring the fingers 91 and 92 into clutching engagement with the clamp 39 on the reciprocating band. The knob 114 is on the end of a pin 128 extending at right angles to the lever body and rotatable inthe ends thereof so that the knob may turn when clutched in the hand as the shoe structure is reciprocated. Thus by merely swinging down the lever 88 the shoe structure is first unclutched from the reciprocating band and then the comparatively light lower portion of the shoe structure may be independently raised and lowered to adjust with precision and accuracy the pressure engagement of the abrading belt against the surface of the work under treatment.

Briefly ysumming up the operation of the machine, the operator places a piece of work'lV on the platform `5 and then vertically adjusts the platform to bring the work in proper position relative to the belt. The motor 8 is then started whereupon the belt 10 is propelled. By then operating the 'clutch lever 20 the crank mechanism is set in operation to cause oscillation of the gear sectors which con-V trol the oscillation of the band 89. lf it is ,desired to automatically reciprocate the shoeV structure thel lever 88 isswung into its upper position. as shown in Figs. 3, 4 and 5 to bring the lingers 91 and 92 into clutching cooperationV witlrthe clamp 89 on the band. The shoe structure will now be automatically shifted backand forth on the abrading belt and means of the lever 11() the rail beam with the shoe structure thereon is moved downwardly `to bring the shoe with the desired pressure against the belt and the work thereunder. rlhe platform 5 being mounted `on rollers ity can be readily moved to bring thel work thereon into desired position relative to the belt. The downward movement of the rail Vbeam is limited bymeans of an adjustable jack screw 129 (Fig. 6) which is supported on the Y arm 130 extending from the frame 2, the jack screw being lbelow the 'upper :outer rod 48 which forms part of the parallel link mechanism, this rod abuttingV against the j ack screw to limit further-downward movement of the rail beam and the shoe structure thereon. i The parallel link mechanism and the carriage and shoe structure are exact-ly counterbalanced by the weights 50 so that the position of the lever 110 governs the effect of the lcounterweights on the shoe, that is to say, when .the lever 110 is in 'its rearmost position the counterweights will overbalance the shoe and its supporting structure and raise the shoe off from the belt and when the lever 110 is drawn forwardlyits weight will cause the carriage and shoe structure to overbalance the weights 50 and descend into engagement with the belt. llhen the operator desires to manually shift the shoe structure along the rail beam 49 he first moves the hand lever 11() to its rearmost position whereupon the counterweights 50 descend and raise the rail beam 49 to its uppermost position. wherein the shaft 43 abuts against a stationary part on the machine frame, in this instance a collar surrounding the shaft 21. The operator then grasps the handle 114 and swings the lever 88 down to the intermediate positionshownk in Fig. 7. This movement as Abefore explained, causes the bar 90 and the shoe part to be shifted forwardly to withdraw the lingers 91 and 92 from the path of the clamp 39 on the reciprocating band. The shoestructure being now free of the band, the operator may reciprocate the carriage and shoe along the rail beam 49 and may also move the lever 88. downwardly/*to the extent permitted by the arcuate slot during which movement `the shoe part S' only will move, the carriage part being vertically stationary since the rail beamis heldagainst upward movement las aboveexplained.

The coiled springs 115 will resist downward movement of the shoe part but 'the force of the springs beingin greaterpart feo counterbalanced by the weight of the lever structure 88 the operator can with ease and precision vertically move the slice part to obtain the desired pressure against the belt and the work thereunder. During such vertical movement of the shoe part the roller supported ycarriage part can be readily shifted along the rail beam by lateral pressure on the lever 88 to bring the shoe part intofthe desired position with reference to the work. The freedom, of movement of the comparatively light shoe part entirely independently of any other part of the machine permits accurate and `fine work to be easily and quickly accomplished.

rTo bring the shoe structure back into its position of automatic reciprocation the operator savings the lever 8S up and bach to its normal position. During such move ment the shoe part is lirst raised into position against the carriage and then the clutch bar 90 is shifted rearwardly to enits clutch fingers between the spaced projections of the clamp 39 on the reciprocating band, and then the lever 110 is operated to control the pressure on the work. The engagement of the flat surfaces of the cam wings against the abutment shoulders provided therefor will hold the lever .88 in its upper position against accident-iai displacement, and the balls 119 which are spring pressed against the cam wings will assist Ithe .coiled springs 115 in holding the shoe part and the lever 8S in normal position. Y

l claim as lmy invention:

1. A machine of the class described having in combination, a traveling member, a shoe structure comprising a carriage 'part and a shoepart, a rail support for receiv- Ving the carriage part, means operable for connecting said shoe structure ywith said traveling member to vtravel therewith, and for disconnecting said shoe structure from said traveling member, said means being operable also for vertically-shifting said shoe part independently of` said carriage part.

'2. A machine of the class described having in combination, a traveling member, a shoe structure comprising a. carriage part and a shoe part, a rail'receiving the carriage part, clutch mechanism for connecting said shoe structure with said traveling member and for disconnecting it therefrom, said shoe part being vertically adjustable relative to said carriage part, and a comman operating lever for controlling the clutch mechanism and the adjustment of said shoe part.

3. A machine of the class described hav ing in combination, Ya traveling member, a shoe structure comprising a carriage part and a shoe part', said shoe part being suspended from said carriage part and adapted. for vertical movement relative thereto, a rail receiving said carriage part, clutch mechanism for connecting said shoe structure with said traveling member, and for disconnecting it therefrom, and means on said shoe part for controlling said clutch mechanism and for moving said shoe'part' independently of said carriage part.

4. ln a machine of the class described, the combination of a traveling member, a shoe structure comprising a carriage part and a shoe part, said shoe part being adapted for vertical movement relative to said carriage part, a rail receiving said carriage part whereby said shoe structure may be shifted as a whole, clutch mechanism on said shoe part forl connecting said shoe structure with said traveling member to travel therewith, means for operating said clutch mechanism, and means for adjusting said shoe part.

5.1n a machine of the class described, the combination of a traveling member, a shoe structure comprising a carriage part and a shoe part, a rail receiving the carriage part on which the shoe structure may travel as a whole, said shoe part being vertically adjustable on said carriage part, clutch mechanism on said shoe part for connecting said shoe structure with said traveling member to travel therewith, and common means for operating said clutch mechanism and for adjusting said shoe part.

6. ln a machine of the class described, the combination of a reciprocatory Vshoe structure comprising upper and lower parts, a reciprocatory driver, parallel link structures suspending said Alower part of the shoe structure from the upper part thereof, a lever hinged on said link structure by means of which said structure may be actuated to raiseand lower the lower part of the shoe structure, a clutch member for connecting the shoe structure with the reciprocatory driver, and a connection between said lever-and clutch mechanism whereby said lever forms a means for operating said clutch mechanism. i

7. In a machine of the class described,

the combination of a reciprocatory shoe structure comprising an upper part and a lower part, a frame pivoted to said parts and adapted to be swung to move said lower part vertically with reference to the upper part, a handle for said frame, a'clutch member on said shoe structure,'and a connectionY between said shoe structure and handle whereby operation ofsaid handle to swing said frame will also operate said clutch member.

' 8. ln a machine of the class described, the combination of a reciproca-tory shoe structure comprising an upper V`part and a lowerrpart, a frame hinged to said upper and lower parts and Vadapted to yswing'to move said lower part vertically, a clutch member shiftable transversely on said lower part, a handle hinged on said Vframe to swing thereon, a connection between said clutch member and handle, said handle when swung causing operation oi said4 clutch member and serving also as a means for swinging said frame to adjust said lower part of the shoe structure.

9. 'ln a machine of the class described, the combination of a reciprocatory driver having ay clutch member thereon, a reciprocatory shoe structure, the lower part of said shoe structure being -inovable vertically relative tothe upper part thereof, a clutch member shiitable on said lower part to be brought into or out of operation with said driving clutch member, and means yfor vertically adjusting said lower part when lsaid clutch members are disengaged.

10. In a machine of the class described, the combination of a reciprocatory shoe structure, means for raising and lowering said shoe structure. asa whole, and means for raising and lowering the lower part of said shoe structure independently of the upper part thereof. y y

11. ln a machine of the class described, the combination of a shoe structure having an upper carriage part and a lower work engaging part, means Jfor shifting the structure longitudinallyT as a whole, means for raising and vlowering the structure as a whole, and means for independently raising and lowering saidy work engaging part.

12. In a machine of the class described, the combination of a rail, a shoe structure comprising an upper part and a lower part, said upper part receiving said rail whereby said shoe Astructure may be bodily reciprocated, means :tor vertically moving said rail and the ent-ire shoe structure thereon, and means for vertically moving said lower part independently of said upper part and rail.

13. A longitudinally traveling shoe structure for machines of the classdescribed comprising an upper section and lower work engaging section, means for vertically moving said shoe structure as a whole, and manually operable means for independently moving said lower work engaging part vertically, said manually operable means bcing adapted to reciprocally move said shoe structure longitudinally regardless oi the relative vertical positions of the upper and lower sections thereof.

14. In a machine ci the class described, the combination of a reciprocatory driver, a. reciprocatory shoe structure comprising an upper part and a lower part, means for vertically reciprocating said shoe structure as a whole, a clutch member reciprocable in said lower part' for controlling the connection and disconnection of said shoe structure relative to said reciprocatory driver, a

link frame suspending said lower part from said upperpart, an extension on said link frame, a lever pivoted on said extension to swing vertically and to movebodily, a connection between said lever and said clutch .member for causing shifting oi said clutch v said parts forassuring accurate verticalV movement of the lower part, and a hand lever connected with said link members to control the swing thereoi and thereby the adjustment of said lower part. I

16. In a machine of the class described, the combination of a longitudinally reciprocable shoe structure comprising an upper part and a movable lower part, upper and lower parallel links connected betwen said parts for assuring accurate vertical movement or' said lower part, and a lever structure connected with said lowerlinks 'for controlling .the swing of said links and thereby the adjustment of said lower part.

17. In a machine of the-class described, the combination of a longitudinally traveling shoe structure, saidshoe structure comprising an upper part and a movable lower part, parallel links connecting said parts for assuring accurate'vertical movement of said lower part, meanstending to hold said lower part in upper position, and a hand 'lever structure connected with said links for con-f trolling the swing thereof and thereby the adjustment of said lower part.

18. ln a machine of the classv described, the combination of a longitudinally traveling shoe structure, said shoe structure comprising an upper part and a lower part, a-link frame suspending said lower part from Vsaid upper part, yielding mechanism acting on said link frame tending to hold said lower part normally in an upper' position, anda hand lever connected with said link frame tor controlling the movement thereof and thereby the adjustment of said lower part.

19. In a machine of the class described, the combination vof a traveling driver, a

shoe structure comprising an upper VVpart' and a lower part and supported to travel longitudinally, a link frame suspending said lower part from said upper part for vertical movement, extension walls on said link frame having longitudinalslots, a pivot'A bolt extending through said slots and be-.l` tween said walls, a lever extending between.

said walls and receiving said bolt to be pivoted thereby on said walls, a clutch member reciprocable in said lower part, an abutment on said driving member, and a connection between said clutch member and said lever whereby swing of said lever will cause shifting of said clutch member to position said member in or out ofthe path of the abutment on said driving member, swing of said lever after shitting of said clutch member away from said driving member abutment causing swing of the link frame and vertical adjustment of the lower part of the shoe structure.

20. ln a machine of the class described, the combination of a traveling driving member, a longitudinally traveling shoe structure comprising an upper part and a lower part, a link structure suspending said lower part from said upper part i'or vertical movement, an extension on said link structure, a bolt extending through said extension and adapted to slide longitudinally thereon, a lever pivoted on said bolt to slide therewith, a clutch abutment on said driving member, a clutch member shii'table on said lower part of the shoe structure, a connection between said clutch member and lever adapted to cause said clutch member' to be shifted into the path oi the clutch abutment when said lever is swung` into an upper position and adapted to withdraw said clutch member from the path of said abutment when said lever is swung to an intermediate position, locking surfaces on said lever adapted to cooperate with said extension to lock said lever when in upper position and when in intermediate position, means tending to hold said lower part of the shoe structure in upper position during swing of the level` between upper and intermediate position, said lever being adapted to be swung below intermediate position andl serving then as a means for swinging said link structure to eii'ect vertical adjustment of said lower part, and means for holding said clutch member in unelutching position during such swing of the lever below intermediate position.

2l. ln a machine of the class described, the combination of a traveling member, a traveling shoe structure comprising am upper part and a lower part, a structure hinged to said parts to suspend the lower part for vertical movement, a lever pivoted on said hinged structure to swing thereon to a vertical position or to an intermediate horizontal position, a clutch abutment on said driving member, a clutch member on said shoe structure, a connection between said clutch .member and lever for causing outward or inward shift of said member when said lever is swung to vertical or horizontal positions respectively, yielding means acting on said hinged structure and tending to hold said lower part in upper position during swing of the lever between upper and intermediate positions, means for locking said lever to the hinged structure when in intermediate position whereby downward swing of said lever from horizontal position will cause swing of the hinged structure and vertical adjustment of the lower part of the shoe structure.

ln testimony whereof, l have hereunto set my hand.

CARL LA'WRENCE MATTISO.

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