US1478044A

US1478044A - Abrading or polishing machine

Info

Publication number: US1478044A
Application number: US490477A
Authority: US
Inventors: Mattison Carl Lawrence
Original assignee: Mattison Machine Works
Current assignee: Mattison Machine Works
Priority date: 1921-08-08
Filing date: 1921-08-08
Publication date: 1923-12-18
Anticipated expiration: 1940-12-18

Description

Dec. as, 1923.

11,473fl44 C. L. MATTISON ABRADING OR POLISHING MACHINE 8 Sheets-Sheet 1 I Filed Aug. 8. 1921 E A n Ucm lira/206 C. L. MATTISON ABRADING 0R POLISHING MACHINE Filed Au. 8, 1921 cs-Sheet Dec. 18 I923. 31A7$fl44 C. L. MATTISON ABRADING 0R POLISHING MACHINE Filed Aug. 8. 1921 8 Sheets-Sheet 6 4 /6'4 1 7 a? Dec. i8, 1923.

Patented Dec. 118, i223.

than

CARL LAWRENCE EIATTISON, OF ROCKFORD, ILLINOIS, ASSIGNOR TO Ii/IATTISON MA.- CHINE WORKS, OF ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

ABRADING 0R POLISHING MACEINE.

Application filed August 8, 1921. Serial No. 490,477.

T 0 all whom it may concern.

Be it known that I, CARL Lmvnnncn Mirrrisox, a citizen of the United States, residing at Rockford, in the county of VVinnebags and State of Illinois, have invented certain new and useful Improvements in Abrading or Polishing Machines, of which the following is a specification.

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

The general object of the invention is to produce a machine of novel and improved construction in which the presser shoe may be operated either manually or by power at will, and may be quickly and conveniently connected to and disconnected from the power driving means; and in which both the speed of reciprocation and length of stroke of the shoe, when driven by power, may be readily varied by the operator while standing at his normal working position at the front of the machine.

Further objects of the invention are to provide an improved construction and arrangement for the shoe structure which will enable it to function with greater flexibility and accuracy; to provide improved reciprocating mechanism for more accurately and efficiently effecting the reciprocation of the shoe structure; to provide improved and simplified means for varying the length of stroke of the shoe structure while the ma.- chine is in operation; to provide improved means for changing the speed of reciprocation of the shoe structure; to provide improved means for disengaging the shoe structure from and reengaging it with the reciprocating mechanism; to provide a single operating lever for controlling the stroke adjusting mechanism and for controlling the application of the shoe structure against the work through the abrading belt; and in general to provide improved construction, arrangement and operation, to increase the efficiency, and to facilitate the accurate control, of a machine of the type referred to.

In the accompanying drawings I have 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 I do not intend to limit the invention to the construction herein disclosed but aim to cover all, modifications, equivalents and alternative constructions falling within the scope of the ap pended claims.

In the drawings Figure 1 is a front elevational view of my improved machine,

Fig. 2 is a plan view,

Fig. 3 is an enlarged plan view of the various gearing and clutch trains which control the operation of the machine,

Fig. 41 is a sectional view on plane 4 4, Fig. 3,

F 1g. 5 Fig. 3,

Fig. 6 is an enlarged plan view of the operation controlling lever of the machine and parts actuated thereby,

Fig. 7 is a side elevational view of the parts shown in Fig. 6,

8 is an enlarged rear elevational view of the adjustable crank mechanism, looking from plane 8-8, Fig. 2,

9 is an enlarged rear elevational view on plane 9-9, Fig. 2 of one of the gear sectors,

Fig. 10 is an enlarged front elevational view of the shoe structure,

Fig. 11 is an enlarged sectional View on plane 11-11, Fig. 2,

Fig. 12 is a sectional view on plane 12-'.12,

is a sectional view on plane 55,

Fig. 11,

Fig. 13 is a sectional view on plane 1313, Fig. 10 of the shoe structure and clamping lever mechanism,

Fig. 14 is an enlarged sectional view on plane 1414, Fig. 10,

Fig. 15 is an enlarged sectional view on plane 15-15, Fig. 10, and

Fig. 16 is av side elevational view of the reciprocating band clamping frames.

Referring to the drawings, the machine supporting frame comprises the

end pedestals

1 and 2, the lower connecting member 3 and the top 4. On the pedestals are guides on which

brackets

6 and 7 are vertically adjustable, said brackets having the horizontal rails 8 and 9 for the rollers 10 and 11 which support the work holding platform 12.

V The platform is thus vertically adjustable shaft13 journaled in suitable bearing stru adjustable in any well known manner.

tures 14 and having at its front end the pulley 15. A spur gear 16 on this shaft i engaged by the pinion 17 on the shaft of the driving motor 18. At the right hand of the machine frame is the transversely extending shaft 19 journaled in the bearing frame 20 and supporting; at its front end the pulley 21. The pulleys 15 and 21 support the belt 22.0n .whose outer side abrasive material is applied. To aline the pulleys or adjust the tension of the belt the bearing frame 2OAis s shown, it is slidable on the machine frame and readily shifted by means of a screw 23. The lower limb or" the belt travels over the platform 12- to be brought into engagement with worlrW placed on the platform by a shoe structure designated as a whole by S.

The shoe structure S is reciprocated lengthwise of the machine in contact with the inner side of the lower limb of the belt to press the outer abrading side of the belt shown in Figs. 1. 2, 3, 7 and 11. A plurality' of brackets 24 (Fig. 11) secured on the machine frame top 1 support upper and

lower rods

25 and 26. In front of these rods and parallel therewith are the

rods

27 and 28 connected by vertical links 29. Horizontal links 30 connect the

rods

25 and 27, and horizonta-l links 31 connect the

lower rods

26 and 28. The front links 29 have the lshaped extensions 32 at their lower ends, such extensions at their front ends being secured to a rail beam 33 extending lengthwise of the machine at the front thereof and above the lower limb of the abrading belt. On this rail beam whichis of I cross section the shoe structure S is reciprocated. To balance the weight of the rail beam and shoe structure thereon. counterwei hts- 34; are rovided.

7 These weights are adjustably secured on the may be clamped against the thus carefully balanced so that the shoe can be applied with accuracy and precision against the abrading belt to thus insure the proper abrading pressure on the work.

The details of construction of the shoe structure S are clearly shown in Figs. '10 to 15 inclusive. The shoe body is of C shape cross section in order that it may span the rail 33 and clear the rail supporting brackets 32. At its upper corners the shoe frame is extended to form

housings

39 and 40 for the track rollers 41 which engage the top surface of the rail. The rollers preferably anti-friction bearings 42 and these bearings engage the eccentric section 13 (Fig. 1a) of the journal pin 4 1 which extends through the front and rear walls of the respective housings. By means of these eccentric journal pins the rollers may be adjusted with reference to the rail, and in order to lock 0 a. V E

the pins in adjusted position the front walls.

of the housings are split in order that they 7 7 pins by clamping screws 45 (Fig. 14). 7 1 V 7 At the lower corners of the shoe frame are the housing extensions 46 and a? in which are journaled the rollers 4i-8 on eccentric pins 49, these rollers'engaging with the under side of the rail 33 and their arrangement and adjustment being similar to that ofthe upper rollers 41.

I At the left and right ends respectively of the shoe frame are the

upper rollers

50 and 51 for engaging against the front side of the rail beam at the top thereof, and on the back of the shoe frame are similar rollers 52 for engaging against the .rear' side of the rail near the top thereof. At the front of the shoe frame and below the

rollers

50 and 51 are the

rollers

53 and 5 1 which engage against the front side of the rail at the bottom thereof, and on the rear side of the frame are similar rollers 55 which engage against: the rear side of the rail near thebottom thereof. Each ofthese side rollers is within a housing extension 56 on the shoe frame, each roller having anti-friction engagement with the eccentric section 57 of a journal pin 58. The outer walls of the housing .56 are split in order that they may be drawn together by clamping screw 59 to lock the ournal pin in adjusted position. the eccentric pin the various, rollers may be readily and accurately adjustedwith reference to the rail so as to insure accurate travel of the shoe structure on the rail.

Secured to the under side of'the shoe frame by screws 60 isthe fitting 61' which has the passageway 62 extending horizon-j tally and transversely of the shoe frame. Reciprocable in this passageway is the bar 63-.which at its rear end has the upper and lower'fingers 64 and 65 for engaging in the slots 66 and .67 of the frames 68 and 69 (Fig. 16) which clamp between them the steel band By means .of

70, this band being reciprocated longitudinally as will be disclosed later. When the bar 63 is shifted rearwardly the fingers 6 1 and 65 engage with the clamping frame and the shoe will be reciprocated on the rail. The bar 63 has the bore 71 for receiving a compression spring 72, the spring abutting at one end against the pin 73 on the bar and at its other end abutting against the pin 7 1 secured on the fitting 61 and extending through the slots 75 in the sides of the bar. The spring tends to hold the bar outwardly to disengage the

fingers

64 and 65 from the clamping frame on the band 7 0, and to shift the bar inwardly, a lever 76 is provided. This lever is pivoted on the pin 77 at the outer end of the bar 63, the lever being bifurcated to receive the flattened end 78 of the bar and to engage between the side walls 79 and 80 at the front end of the fitting 61. When the lever is up (Fig. 10) the spring 72 pushes the bar 63 rearwardly to connect it with the clamping frames 68, 69, on the reciprocating band 70. hen the lever is swung downwardly its cam surface 81 will engage with the lower edge of the frame 61 to cause the bar 63 to be drawn outwardly, and when the lever is in full lower position its square end 82 will abut against the edge of the frame 61 and the bar will be locked in its outer position to withhold its

fingers

64 and 65 from the clamping frames on the I band 70. The shoe structure can thus be Sit very readily disconnected from the band, or engaged therewith to partake of its reciprocating movement, and this may be done if desired while the band 70 is moving.

Extending downwardly from the fitting 61 are front and

rear lugs

83 and 8% which are threaded to receive

trunnion screws

85 and 86, the screws being pointed and engaging in the front and rear sides of a block 87. Extending upwardly from the shoe plate supporting frame 88 are the left and

right lugs

89 and 90 which are threaded to receive

trunnion screws

91 and 92 whose ends are pointed to engage in the left and right ends of the block 87. A universal pivot connection is thus provided between the frame 88 and the shoe structure body. The frame 88 has a transversely extending guideway 93 for the plate 94: whose underside is provided with an anti-friction facing 95 which may be canvas treated with graphite or other antifriction material. The facing may be read ily applied by curling it around the end flanges 94; on the plate and pressing pivoted clamps 96 against it by means of set screws 97 The plate has the transverse slot 98 for receiving a clamping screw 99 which extends through the frame 88 to be engaged by a nut 100. By loosening this nut the shoe plate 94 can easily be withdrawn from the shoe structure for the application or adjustment of the anti-friction facing. As before stated,

hub 117 the shoe structure is reciprocated over the lower limb of the abrading belt and when pressure is applied the shoe structure presses the belt against the work W. To insure uniform engagement of the shoe plate with the 103 which is journaled in the bearing frame 10% mounted on top of the machine frame. The shaft 103 has the spur pinion 105 which through the idler gear 106 drives the spur gear 107 on the rear end of the shaft 108. This shaft is journaled in

bearings

109 and 110. Adjacent the bearing 109 the shaft has rotatably mounted thereon the pinion 111, and adjacent the bearing 110 the shaft rotatably carries the pinion 112. The pinions are between the bearings, and between the pinions the shaft has spiined thereto the clutch collar 113 which is adapted to assume a neutral position, or to be shifted into clutching engagement with either of the clutch flanges 11% and 115 of the, pinions 111 and 112 respectively. The clutch lever 116 operable from the front of the machine is provided to control the shifting movement of the clutch collar.

At its front end the shaft 108 has the rotatable thereon, on which hub are the small and

large gears

118 and 119, the hub being held in place against the bearing 110 by the collar 120. At the left of the shaft 108 is the parallel tubular shaft 121 which is journaled in the bearings 122 and123. At its front end in front of the bearing 123 this shaft has secured thereto the gear 1241- which meshes with the gear 118 on the shaft 108. Journaled within the tubular shaft is the shaft 125 and the front end of this shaft is also journaled in the bracket- 126. On this shaft between the tubular shaft and thecollar 127 the gear 128 is rotatable and this gear meshes with the gear 119 on the shaft 108. On the tubular shaft 121 in front of the bearing 122 is secured the gear 129 which meshes with the gear pinion 111 on the shaft 108. Adjacent the inner end of the bearing 123 the gear 130 is secured to the tubular shaft 121 and meshes with the pinion 112 on the shaft 108. By means of the clutch member 113 either

gear

129 or 130 may be connected with the shaft 108 for rotation at speeds dependshift.

ing upon the gear train dimensions. The

gears

118 and 119 merely serve to transmit rotation from the tubular shaft 121 to the gear 128 on the shaft 125. n the shaft between the gear 128'and the bearing 126 a clutch sleeve 131 is splined but free to When this clutch sleeve is moved from neutral position into engagement with the clutch flange 132 on the gear 128, the gear will be connected with the shaft 125 to cause rotation thereof. When the clutch sleeveis shifted outwardly from neutral position it engages the brake flange 138 on the bracket 126 and the shaft 125 is locked against rotation.

On the inner end of the tubular shaft 121 is carried the crank disk 184 into which the shaft 125 extends and there carries a bevel pinion 135. Extending diametrically of the crank disk in the groove 136 is the screw shaft 1237 (Figs. 4, and 8) which has bearing in the lug 138; This screw shaft has secured thereto the bevel gear 139 which meshes with the pinion 135. Eeeiprocable in the groove 136 in

suitable ways

140 and 141 is a crank block 142 from which extends a crank pin 143, the base of the block being threaded to receive the screw shaft 137., The crank pin 143 is connected by a connecting rod 144 with the crank pin 145 on the gear sector 146 (see Figs. 1, 2 and 9) at the left of the machine (Fig. 2). This gear sector is securedon the shaft 147 extending transversely on the machine and journaled in bearing frame 148. Below the shaft 147 this hearing frame journals the shaft 149 on whose rear end isthe pinion 150 (Fig. 9) which meshes with the gear sector-146. At its front end the shaft 149 has secured thereto the wheel 151. At the right side of the machine is the bearing frame 152 in which is journaled the upper shaft 153 which at its rear end carries the gear sector 154 Which is in longitudinal alinement with the gear sector 146 at the left of the machine. Below the shaft 158 is the shaft 155 which at its rear end has the gear pinion 156 with which the gear sector 154 meshes. At the front end of the shaft 155 is the wheel 157 which is in longitudinal alinement with the wheel 151 at. the left of the machine. The band heretofore referred to and to which the shoe structure may be clamped partly surrounds at its ends the

wheels

151 and 157 and is.

secured thereto. The

gear sectors

146 and 154 have the same radius and are inter' 7 connecting rod 144 will be communicated to the gear sector 154 and through the

shafts

149 and 155 to the

wheels

151 and 157 so that the band 70 is reciprocated, the shoe structure partaking" of such reciprocation when clamped to the band.

ldeans is provided for adjusting the length of the rod structure 158 for the dual purpose of taking up lost motion and backlash in the gearing which drives the band I will be rotated so as to rotate the

wheels

151 and 157 in opposite directions and thus place tension on the band 70.= With this adjusting mechanism, a, smoothand firm driving connection for the shoe structure is provided and all lost motion or backlash at the ends of the reciprocatory movements of the shoe are obviated. This feature is of great importance in'a machine of this charactor and I believe it to be broadly new.

I have provided a special construction for the

gear sectors

146 and 154 which permits the quick and easy renewal of the gear faces thereof in case of breakage or undue wear. Each gear sector is provided-with a separate arcuate face: plate 146? on which the gear teeth are formed, the said face plate being suitably secured to the'circumferential portion of the sector by screws 146*..and bevel faced clamping blocks 146 engaging bevelled ends on the gear face plate 146 the face plate 146? may be quickly removed and replaced by anew plate.

The purpose ofthe clutch sleeve 181already described is to control the relative rotation between the tubular shaft 121 and the inner shaft'125. When the clutchmem- 7 her is in neutral position, rotation of the tubular shaft will not be communicated to idly'on the inner shaft. The inner'shaft,

owing to the gear pinions 135 and 139, will rotate with the tubular shaft at the. same speed. There will, therefore, be no rotation of the screw shaft 137. If the clutch .mem-

her is shifted into connectjthe gear 128 with the shaft, 125 then rotationof the 'By removing or loosening the screws 146 V the inner shaft, as the gear 128 will rotate i tubular shaft will. result in rotation ofthe .7

inner shaft through the gear train 124,118, 119 and 128 and the dimensions of the gears will rotate considerably faster thanlthe tubular shaft, the result being relative rotational movement between the gears' and of this train are such that the shaft 125 7 139 and consequently rotation of the screw shaft 137, the crank block 1 12 bein then shifted radially on the crank disk to shorten the crank radius and thereby shorten the rocking movement of the gear sectors 1-16, 154, so that the distance of reciprocation of the band 7 O is shortened and likewise the stroke of the shoe structure S clamped to the band. i

When the clutch sleeve 131 isshifted outwardly against the brake flange 133 the shaft 125 can not rotate so that rotation of the tubular shaft will again result in relative rotational movement between the

gears

135 and 139 and the crank block 142 will be shifted outwardly to increase the crank radius and thus increase the reciprocation of the band and the stroke of the shoe structure.

To enable the clutch member 131 to be readily controlled by the operator from the front of the machine, 1 provide the rod 161 (see Figs. 3, 6 and 7 which at its front end has the grip 162. The rod is at the left of the shaft 121 and parallel therewith and is slidable in the sleeve 163 which is trunnioned between the screws 16 1 in the bracket 165, which bracket is pivoted on the frame arm 166 to rotate in a horizontal plane. The rod 161 may thus be slid longitudinally and swung vertically and horizontally. The bracket 165 has the forwardly extending arm 167 connected by the link 163 with the inner arm of the bell crank lever 176 which is pivoted on the projection 1'71 extending laterally from the bracket 126; The other arm of the bell crank lever 170 engages in the peripheral groove 172 in the clutch member 131. /Vhen the rod 161 is swung laterally the bell crank lever 170 is rocked andthe clutch member 131 may be moved to neutral position or to its inner or outer positions to cfiect the desired changes in the length of stroke of the shoe structure.

At its front end the rod 161 slides through the sleeve 173 on the block 174 secured on the upper rod 127 which forms part of the shoe structure supporting mechanism. The sleeve is held on the block by a strap 175 and its lateral swing is limited by the stop 176 between which the strap extends. The rod 161 serves as a ready means for raising and lowering the track or guide rail 33 on which the shoe structure is mounted, vertical swing of the rod being communicated to said structure and to the shoe structure. Owing to the counter-balance mechanism already described, the shoe structure can thus be very readily raised and lowered so that accurate abrading will result. As the work holding platform 12 must be shifted on the tracks 6, 9, in order to bring all parts of the work thereon into position to be engaged by the abrasive belt,

the rod 161 is thus 'made longitudinally shiftable in order that it may be more conveniently operated.

The balance between the weights 34 on one side of the pivotal axis, and the shoe structure and its supporting framework on the other, is so nicely adjusted that when the rod 161 is slid to its rearmost position the weights 341 will, over-balance the shoe structure and its supporting framework and raise the shoe structure away from the abrading belt. 0n the other hand, when the rod 161 is drawn outwardly some distance the shifting of the weight of the rod and its handle 162 will overbalance the weights 34: and cause the shoe to descend into contact with the belt.

To prevent undue pressure by the shoe structure against the abrading belt and the surface to be abraded, I provide adjustable stop mechanism for limiting the downward swing of the shoe structure supporting framework. Referring to Figs. 1 and 5, the bracket 126 which supports the outer end of the shaft 125 passes between the front upper and

lower rods

27 and 28 and is provided with an abutment screw 177 for the upper rod. The rod engages with the abutment screw as the shoe structure is moved downwardly and stops further movement so that the shoe structure cannot be applied with harmful pressure against the belt and the work engaged thereby. By means of the rod 161 the operator can thus accurately control the stroke of the shoe structure and its pressure against the abrading belt, the stop preventing harmful application of the belt. By means of the lever 116 the operator can control the speed of reciprocation of the shoe structure, and if he desires to apply the shoe structure independently of the reciprocating band 70, he pulls down the lever 7 6 to release the shoe structure from the abutment frames 68 and 69 of the strap. The gearing trains of the machine are protected by housing structures 178 which can be readily removed when desired.

Summing up the operation of the machine, the operator places a piece of work 1V on the platform 12 and then vertically adjusts the platform to bring the work in proper position relative to the abrading belt. He then starts the motor 18 whereupon the belt is propelled. He then shifts the lever 116 for slow or fast reciprocation of the shoe structure reciprocating band 70. Upon shifting of the clutch 113 rotation is transmitted from the shaft 108 to the tubular shaft 121 and the crank disk 13% rotates so that the gear sectors are rocked through the connecting rod mechanism. This causes the band 70 to reciprocate and if the shoe structure is clamped thereto, the shoe structure will partake of the reciprocation. By

manipulation of the rod 161 the shoe structure is pressed as desired against the abrading belt to control the degree of abrading pressure on the work. To regulate the stroke of the shoe structure the operator swings the rod 161 laterally. Upon swing to the left the clutch member 131 will be shifted to connect the gear 128 with the shaft 125 and this shaft will rotate faster than the tubular shaft 121 and the crank block 1 12 will be shifted to shorten the crank radius thereby to shorten the stroke of the band and of the shoe structure. When the lever 161 is swung toward the right the If, at any time, the operator desires to manually operate the shoe structure, he pulls down the lever 76 and uses it as a grip for shifting the shoe as desired on the supporting rail and pressing it downwardly against the abrading belt. When the shoe structure is clamped to the reciprocating band its vertical movement is controlled by pressure of the rod 161 against the shoe supporting framework, the counter-balance weights 3 1 tending to raise the shoe structure from pressure engagement with the abrading belt. During abrading operation of the machine, friction between the belt and the shoe structure is kept at a minimum by the anti-friction facing 95 on the shoe plate. Anti-friction material or substance may also be applied on the inner side of the abrading belt.

From the foregoing description it will be observed that I have provided a machine which maybe quickly and easily converted from manual operation into automatic or semi-automatic operation, it being only necessary in changing from one to the other to swing the hand lever 76 of the shoe structure up or down as the case may be, so as to effect a connection of the shoe structure with or disengagement thereof from the driving band 70. This feature I believe to be broadly new and is of great practical importance.

It will also be noted that the operator, while standing in his normal working position at the front of the machine, has within easy reach complete control of all of the mechanisms of the machine so that he may not only change from manual to automatic operation or vice versa, but may also at will vary the speed of reciprocation of the shoe as well as to vary the pressure of tl e shoe structure upon the work.

Iclaim as my invention:

1. A machine of the class described having, in combination, a presser shoe structure, a guide rail on which said shoe structure is reciprocably mounted, powermeans for reciprocating said shoe structure includ ing a rectilinearly reciprocable element ex? tending parallel with the guide rail behind said shoe struct and 'means movably mounted on said shoe structure and arranged to be engaged with and disengaged from said rectilinearly reciprocable element.

2. A machine of the class described having, in combination, a reciprocatory shoe structure and a support therefor, a reciprocatory driver for said shoe structure, and

disengageably interlocking parts on said shoe structureand driver respectfully.

3. A machine of the class described having, in combination, a reciprocatory shoe structure, a reciprocatory driver, parts mounted respectively on said shoe structure and said driver and arranged to disengageably interlock, means for engaging'and separating said parts at will, and means operable by the operator adapted to simultaneously vary the abrasive pressure and length of stroke of said reciprocating device.

4:. A machine of the class described, having, in combination, a reciprocatory shoe, a reciprocatory driver, and means carried by the shoe forengaging and disengaging said 7 driver. a r

" 5. A machine of the class described having, in combination, a reciprocatory presser device, driving means therefor, and means providing a readily .disengagable connection between said device and its driving means, said connection means being located immediately adjacent to said device. 7

6. A machine ofthe class described having, in 'combination, a reciprocatoryshoe, reciprocatory driver,and means including a lever mounted on the shoe for engaging and disengaging said driver and shoe, said lever providing a handle for manually reciprocating said shoe when disconnected from the driver.

7. In a machine of the class described, the combination of a guide a shoe structure reciprocable on said guide, a flexible reciprocating element parallel'with said guide and means for reciprocating said element, abutment means on said reciprocating element, and a bar shiftable on said shoe structure into the path of said abutment means whereby said shoestructure will partake of the reciprocating movement of said flexible element.

8. In a machine of the class described, the combination of a stationary rail, a resaid frame and a lever pivoted at one end and having connection with said frame at its other end by means of which lever said frame may be swung and pressure applied by the shoe structure on work to be abraded.

18. In a machine of the class described, the combination of four horizontally extending parallel rods, upper and lower horizontal links connecting said rods, front and rear vertical links connecting said rods, said rods and links forming a rectangular flexible frame structure, means for support in one side of said frame structure, a rail supported from the front vertical links of structure, a shoe structure reciprocable on said rail, counterbalance weights connected with said flexible frame and acting in opposition to the weight of said shoe structure, and a lever for engaging said frame structure to press the-shoe downwardly.

19. In a machine of the class described, the combination of upper and lower rods, vertical links connecting said rods, a support, parallel horizontal links connecting said support with said rods, ahorizontal rail supported from said rods, a shoe'structure supported on said rail to reciprocate thereon, counterweight mechanism pivoted on said support and engaging with the upper rod, said counterweights acting in opposition to the weight of said rail and shoe structure, and means for moving said shoe structure and its supporting structure downwardly.

20. In a machine of the class described, the combination of a reciprocable shoe structure for applying abrasive pressure on work tolo'e treated, a crank head, a crank pin shiftable on said head, connecting mechanism between said crank pin and shoe struc ture for imparting reciprocable motion thereto when said crank head turns, a screw shaft journaled on said crank head and engaging said crank pin to shift the pin when it is turned to thereby change the crank radius, a gear on said screw shaft, shaft supporting said crank head, a second shaft concentric with said crank head shaft, a gear on said second shaft meshing with said screw shaft gear, driving means for said shafts, and clutch mechanism operative to permit said shaft to rotate at the same speed or to cause them to rotate at different relative speeds, said gears being inert when said shafts travel at the same speed but becoming operative to cause rotation of the screw shaft to shift the crank pin when said shafts travel at different. relative speeds.

21. In a machine of the class described, the

combination of a reciprocable shoe structure for applying abrasive pressure on work to treat-d, a crank head, a shaft therefor, illCllflIllSlll actuating said shaft, a crank pin fta le on said head to change the crank radius, mechanism connecting between said crank pin and shoe structure to impart reciprocable motion thereto, a second shaft e ending through said crank shaft, a connection between said second haft and said c1 ank pin for shifting said pin, and means controllable by the operator for connecting ssh-.second shaft with said mechanism actug the first shaft whereby shifting of d pin is effected.

22. In a machine of the class described, the combination of a shoe structure adapted to be reciprocated over work to be treated, a crank head, a shaft therefor, mechanism actuating said shaft, a crank pin shiftable on said head, connecting mechanism between said crank pin and said shoe structure for reciprocating said shoe structure when said crank head turns, an adjusting train extending through said shaft and connecting with said crank pin for shifting said pin to change the crank radius and thereby the stroke of said shoe structure and means controllable by the operator for connecting said adjusting train with the mechanism actuatsair shaft whereby the said shaft actu- "11) sting mechanism also operates to shift said In a machine of the class described, the combination of a reciprocable shoe structure for imparting abrasive pressure on work to be treated, two concentric shafts, a crank head on one of said shafts, a crank pin on said crank head, mechanism connecting said crank pin with said shoe structure for imparting reciprocable motion thereto when said crank head turns, an adjusting train ex tending from the crank pin to the shaft which is concentric with the crank head shaft, said adjusting train when operative causing shift of said crank pin to change the crank radius, said adjusting train being inoperative when said shafts rotate at the same speed, and means for driving said shafts at different relative speeds whereby to cause said ad'ustin train to become 0 aerative tov ciprocating member adjacent said rail, a shoe structure slidable on said rail, and means for at will connecting said shoe structure directly with said reciprocating member to partake of the reciprocation thereof.

9. In a machine of the class described, the combination of a rail, a reciprocating member adjacent said rail, a shoe structure mounted on said rail, a transversely shiftable bar on said shoe structure, abutments on said bar and reciprocating member, and a lever for shifting said bar to bring said abutments into engagement whereby said shoe structure will be connected with said reciprocating member to partake of the reciprocation.

10. In a machine of the class described, the combination of a rail, a shoe structure reciprocable on said rail, a reciprocating member adjacent said rail, abutments on said reciprocating member, and an abutment on said shoe structure adapted to be shifted into engagement with said reciprocating member whereby said shoe structure will be reciprocated on said rail by said reciprocating member.

11. In a machine of the class described, the combination of two oscillating structures, connecting rod mechanism extending between said structures to transmit the oscillation from one to the other, a crank head having a crank pin, a connecting rod connecting said crank pin with one of said oscillating structures whereby said structures will be oscillated when said crank head turns, a band connecting with said oscillating structures to be longitudinally reciprocated thereby, a rail in front of said band,

a shoe structure on said rail, and means for disengageably connecting said shoe structure with said band to partake of the reciprocation thereof.

12-. In a machine of the class described, the combination of two oscillating structures, a crank head, a crank pin for said head, a connecting rod connecting said crank pin with one of said oscillating structures to cause oscillation thereof when the crank head turns, a connecting rod between said oscillating structures to communicate the oscillation of the one structure to the other structure, a band connected with said oscillating structures to be longitudinally reciprocated, a rail, a shoe structure on said rail, means for connecting said shoe structure with said band to partake of the reciprocation thereof, and means for adjusting said crank pin on said crank head to thereby change the degree of oscillation of said oscillating structures and the stroke of reciprocation of said band and shoe connected therewith.

13. In a machine of the class described, the combination of a supporting frame, a

shoe structure shiftable longitudinally on said frame, said frame being hinged whereby it may be moved to apply said shoe structure with varying degrees of pressure on work to be treated, mechanism for re ciprocating said shoe structure on said frame, adjusting means for changing the stroke of said shoe structure, and a common operating lever having connection with said swinging frame and with said stroke adjusting mechanism whereby said frame may be swung to control thepressure of the shoe structure on the work andsaid stroke adjusting mechanism simultaneously operated to vary the stroke of the shoe structure.

14. In a machine of the class described, the combination of a reciprocable shoe structure for applying abrasive pressureon work to be treated, a rail structure on which said shoe structure is mounted, said rail structure being movable, a lever connected with said rail structure for controlling the movement thereof to thereby vary the pressure of the shoe structure against the work during reciprocation thereof, reciprocating mechanism connected with said shoe structure, and means for adjusting the reciprocating mechanism to change the stroke of said shoe structure, said lever being also connected with said means for ad justing the reciprocating mechanism to control its adjustment.

15. In a machine of the class described, the combination of a rail structure adapted to move vertically, a shoe structure reciprocable on said rail structure above work to be treated, reciprocation producing mechanism connected with said shoestructure, means for adjusting .said reciprocation producing mechanism to change the stroke of reciprocation, and acommon lever for controlling the adjusting mechanism and the swing. of said track structure whereby the stroke of said shoe structure and the pressure of its application to Work may be simultaneously controlled.

16. In a machine of the class described, the combination of a vertically movable track member, a shoe structure mounted on said track member to reciprocate thereon. reciprocation means connected with said shoe structure, means for adjusting the stroke of of said reciprocation means and thereby of the shoe structure, and an operating lever having combined vertical and lateral movement, said lever being connected. with said track member and with said stroke adjusting mechanism to simultaneously control movement of said track member and shoe structure thereon and the stroke of the reciprocation mechanism and the shoe structure.

17. In an abrading machine of the class described, the combination of a frame Cal dius, said train being inert when said shafts rotate at the same speed whereby the crank radius will be maintained, a driving connection between said shafts, and clutch mecha nism for controlling said driving connection to per-mi said shaf s to revolve at the same speed or to cause different relative speeds thereof, such different relative speeds causingoperation of the adjusting train and shifting of the crank pin to change the crank radius.

In a machine of the class described, the combination of a reciprocable shoe structure for apply ng abrasive pressure on work to be treated, a crank head, acrank pin shiftable thereon to change thecrank radius, connecting mechanism between said crank pin and shoe structure for effecting reciprocation of said shoe structure when the crank head turns, a shaft supporting said crank head, a second shaft, an adjusting train partly carried by said crank head and partly by said second shaft, said adjusting train being connected with said crank pin, said adjusting train being inert when said shafts rotate at the same speed whereby said crank pin will maintain its crank radius, a. driving connection between said shafts, and means for adjusting said driving connection to cause different relative speeds of said shafts and thereby operation of the adjusting train to shift the crank pin.

26. In a machine of the class described, the combination of a reciprocable shoe structure for applying abrasive pressure on work to be treated, two concentric shafts, a crank pin and adjusting mechanism therefor bodily carried with one of said shafts, a connection between said crank pin and said shoe structure for effecting reciprocation thereof when said crank pin travels, a driving connection between said other shaft and said adjusting mechanism which is inert when said shafts rotate at the same speed but which is operative during different relative speeds of said shafts to shift said crank pin to change the crank radius and thereby the stroke of said shoe structure, and means for controlling the relative speeds of said shafts.

27. In a machine of the class described, the combination of a reciprocable shoe structure for applying abrading pressure on work to be treated, a crank head, a crank pin on said head connected with said shoe structure, a transmission train carried by said head and connecting with said pin, a shaft for said crank head, a second shaft concentric with said crank shaft, a driving connection between said second shaft and transmission train, said transmission train being inert when said shafts are rotated at the same speed but being driven from said second shaft when said shafts rotate at a different relative speed, and mean for driving said shafts at different relative speeds, operation of said transmission train caus- 'ng said crank pin to shift and change the radiu wnereby the stroke of said 0 structure iscorrespondingly changed. in a machine of the class described, combination of a reciprocable shoe struce for controlling the abrasive pressure on work to betreated, a crank head, a crank pin therefor, connecting mechanism between said crank pin and shoe structure for effecting reciprocation. thereof when said crank head is turned, a shaft for said crankhead, a secondshaft concentric with said'crank head shaft, a transmission train between said second shaft and said crank pin, said transmission train being inertwhen said shafts rotate at the same speed, and means for changing the relative speeds of said shafts thereby to cause said transmission train to operate to effect shifting of the crank pin to thereby change the crank stroke and the stroke of reciprocation of said shoe structure.

29. In a machine of the class described, the combination of a reciprocable shoe structure for applying abrasive pressure on work to be treated, a crank head, hollow shaft for said crank head, an inner shaft in said hollow shaft, a screw shaft on said head, gearing connecting said screw shaft with said inner shaft, a crank pin having threaded connection with said screw shaft, and means for driving said shaft at variable relative speeds whereby to cause rotation of said screw shaft and adjustment of said crank pin to change the crank radius and thereby change the stroke of said shoe structure.

30. In a machine of the class described, the combination of a reciprocable shoe structure for applying abrasive pressure on work to be treated, a crank head, a tubular shaft supporting said head, means for driving said shaft, an inner shaft in said tubular shaft, screw shaft extending transversely on said crank nead, gearing connecting said inner shaft with said screw shaft, a crank pin having threaded connection with said screw shaft, connecting mechanism between said crank pin and shoe structure for effecting reciprocation thereof during turning of the crank head, and means for driving said inner shaft faster or slower than said tubular shaft to thereby cause rotation of the screw shaft and radial adjustment of said crank pin whereby the stroke of the shoe structure is correspondingly adjusted.

31. In a machine of the class described, the combination of a reciprocabl-e shoe tructure for applying abrasive pressure on work to be treated, crank head, a hollow driving shaft therefor, a crank pin shiftable on said head, connecting mechanism between said pin and shoe structure for effecting the reciprocation thereof, an inner shaft Within said hollow shaft, an adjusting train between said inner shaft and said shiftable pin, and means for controlling the relative speeds of said shafts to thereby effect shifting of said crank pin and variation in the stroke thereof to correspondingly control the stroke of said shoe structure.

32. In a machine of the class described, the combination of a Presser shoe structure reciprocating mechanism for reciprocating said shoe structure, a crank head and a crank pin forming part of said reciprocating mechanism, means actuating said crank head, means operable by said first mentioned means during reciprocation of said shoe structure forvarying the crank radius of said crank pin to thereby efiectvariation in the stroke of the shoe structure.

In a machine of the class described, the combination of a shoe. structure'for applying abrading pressure to ork to be abraded, means for reciprocating said shoe structure, and means extending to a position to be controlled by the operator standing in front of the machine and operable during reciprocation of the shoe for simultaneously varying the length of stroke and abrasive pressure thereof.

In testimony whereof I have hereunto set my hand.

CARL LAlVR-ENCE MATTISUN.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,4780%, granted December 18, 1923, upon the application of Carl Lawrence Mattison, of Rockford Illinois for an improvement in Abrading or Polishing Machines, errors appear in the printed specification requiring correction as follows: Page 6, line 93, claim 3, before the word means insert the word and; line 94, commencing with the comma and word and strike out all to and including the word device in line 97; same page, line 105 claim 5, strike out the word and and line 109, claim 5, after the word device and before the period insert the comma and Words and means operable 63 the operator adapted to simultaaeouslg rary the abrasz'ce pressure and Zeaflth of stroke of said reciprocating device; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 18th day of March, A. D., 1924.

[SEAL] KARL FENNING,

Acting Oomvm'ssioner of Patents.