US1316841A

US1316841A - Floor sanding and polishing machine

Info

Publication number: US1316841A
Authority: US
Publication date: 1919-09-23
Anticipated expiration: 1936-09-23

Description

W. G. JOHNSON.

FLOOR SANDING AND POLISHING MACHINE.

v H APPLICATION FILED NOV. 19, 1917. 116, 11.

H p h 0. N 1 1 1 1 1 H |mw 1 I 1 d 3 E M 0 MM .N 0J S m T m y Y 4 P N B W W. G. JOHNSON.

FLOOR SANDING AND POLISHING MACHINE.

APPLICATION FILED NOV-'19. 19H. 1 .1 ,3 1 6,841 Patented Sept. 23, 1919.

4 SHEETSSHEET 2- III A lllllli gm \HIII Ill-ll INVENTOR. WaMz/z 61mm W. G. JOHNSON. FLOOR SANDING AND POLISHING MA CHINE.

. APPLICATION FILED NOV. I9. 19!]. 1,816,841. I PatentedSept. 23,1919.

4 SHEETS-SHEET 3.

1 N VEN TORv Waldm f'msm W. G. JOHNSON.

FLOOR SANDING AND POLISHING MACHINE.

\ APPLICATION FILED NOV. 19, 1917. 1,316,4HL

Patented Sept. 23, 1919. 4 SHEETS-SHEET 4.

INVENTOR.

WALDEN G. JOHNSON, LOS AN CALIFORNIA.

noon SANDING AND POLISHING MACHINE.

specification of Letters Patent. Patefitedl Sept, 23, 119119,,

Application filed November 19, 1917. Serial No. 203,042.

Toollwhom it may concern:

Be it known that I, WALDEN G. J oHNsoN,

p a subject of the King of Sweden, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Floor Sanding and Polishing Machines, of which the following is a specification.

' wood floors and of being self 5 means may 25 l My invention relates to sanding and polishing machines and has for a primary object the provision of a portable machine ca pable of use for sanding and polishing hard propelled over the floors during its operatio A further Ob]80t is to provide means supported on the machine for operating the sanding and polishing elements and capable of being connected to the traction wheels of the machine for imparting power from a motor thereto. g

A further object isto provide a machine of the character referred to having a carriage upon which the sanding and polishing be supported and adapted to be self prope ed over the floor in both forward and reversedirections at will by an opera tor or, operated as a stationary machine, as may be desired. V

A further object is to provide suitable transmission means and steering means for the machine carriage by means of which the application of power may be made to the traction elements and the machine guided in desired directions. A furtherob ect is to provide a machine of the character described, a blower and means leading thereto for removing all dust from the floor over which the machine traverses during its operation and-means asso-- ciated therewith for collecting the dust in a suitable receptacle or bag. Other objects Y may appear as.the description progresses.

I have illustrated one form of machine in. the drawings hereto annexed showing a pre. ferred embodiment of my invention which I will now describe in detail, similar characters of reference being employed in the several views of the drawings for indicating the same or like parts and reference being made thereto in the specification hereinafter following. a

' Referring particularly to the drawings,

' Figure 1 is a side elevation of my assembled machine, Fig. 7 2 is a' plan of the sand belt tightening means, Fig. 3 is a transverse section of the same and Fig. at is a transverse 8601 1011 of the platform of the machine showmg the support for the said tightening means.

Fig. 4 shows a modified form of tightening means. Fig. 5'is a planof the machine, Fig. t3 1s a rear end elevation of the same, Fig. 7 1s a plan of the transmission means, sanding belts and shoes therefor, Fig. 8 is a side ele- Vation of the worm gear transmission means and Fig. 9 is avie'w of the same, partly in section, at right angles to Fig. 8. Fig. 10 is a front end elevation of the machine, Fig. 11 is an enlarged longitudinal section of the front end of the machine, Fig. 12 is a perspective View of the sanding and polishing shoes and attachments therefor and Fig. 13 is a composite section of the same. Fig. 14: is an enlarged transverse section of the steering mechanism and Fig. 15 is a longitudinal section of the same. Fig. 16 is a plan of the steering bar and transmission lever;

In. the detailed description of my device hereinafter following it will be obvious that the structure shown and described is capable of substitution and modification to a limited extent without enlarging the scope or departing from the spirit of my invention.

Briefly described my invention consists of acarriage A having main traction wheels B and pilot wheels 0, sandin and polishing belts D, a motor for operating the traction wheels and polishing belts, and a blower mechanism F for collecting the dust resultin from the operation of the machine.

arriage A includes a platform 10 having recesses lland 12 formed in the opposite ends thereof for receiving a pair of sand belts D operating on opposite sides of the machine. The main traction wheels B are supported on a transverse axle l3 journaled a swivel yoke 20, said yoke having a vertical" stem 21 with a square end 22 riveted or otherwise secured in the central portion of the yoke so as to turn therewith. The stem 21 extends upwardly through a hollow shaft 23 which is pivotally supported in a bracket in bearings 14 and 15 at opposite ends and formed on brackets 16 and 17, respectively,

' that it may be moved about, as hereinafter .24 attached to the lower side of the platform 15. The upper end of the stem 21 is attached to'a ball fitting 27 having arms 28 secured therein and extending opposite directions therefrom for the purpose of turnmg the stem and the pilot wheels beneath the plat form 10. Thus the carriage A is portably mounted on the -traction and pilot wheels so more fully described.

Motor E is connected with and operates a driven pulley 28 on a transverse shaft-29 by means of a belt 30 running over the motor driven pulley 31 and the belt operating through suitable apertures in the platform 10, as at 32. Driven shaft 29 is revolubly supported in bearings 33 which are adjustably held in brackets 34 depending from the bottom of the platform 10 and on opposite sides thereof. Motor E is suitably mounted on a base 35 and blocks 36, so that it may be adjusted slightly in position for tightening the belt 30.

Motion is communicated to the forward axle 13 which carries the main traction Wheels B, by means of a longitudinal shaft 37, which is journaled in a bearing 38 suspended from the platform 10 at a point near the front of the machine and at the rear end this shaft is journaled in a worm gear housing 39, which" is suspended from the rear axle 29. Shaft 37 is driven by means of a worm gear 41 meshing therewith and mounted on the end of the shaft 37, both of said worm gear elements being inclosed in said housing, as shown in Figs. 8 and 9, as usual. The forward end of shaft 37 carries a bevel friction pinion 42, or cone, which is adapted to engage selectively with one or the other of a pair of cones 43 and 44 which may be integrally formed as shown or separate and slidably keyed .to the front axle 13. Cones 43 and 44 are moved longitudinally of axle 13 by means of a yoke 45 which engages an annular groove 46 formed centrally of the" cones and is attached to the front end of a longitudlnal clutch operating rod or shaft 47 supported at the front end in a bearing 48 integrally formed with bearing 38 0f the shaft 37. The rear end of clutch operating shaft 47 is pivotally held in a bearing 49 formed on the bracket 24 of the steering gear and carries a bevel gear 50 which meshes with a similar gear 51 carried on the lower end of the hollow shaft 23 of the steering gear. The upper end of shaft 23 carries a clutch operating lever composed of a stationary part 52 attached to the shaft 23 by any suitable means and to which is pivdirection from a neutral position as shown, 7

will effect a corresponding movement of shaft 47 and yoke 45, the yoke in turn moving the cones 43 and 44 correspondingly so as to engage the pinion 42. Thus either a forward or reverse motion may be imparted to the traction wheels and the traction wheels and the steering mechanism and clutch means being convenient to an operator who may sit upon a' seat 56 attached to the platform 10, and operation of the machine maybe easily controlled.

Rear axle 29 and shaft '37 rotate continuously during the operation of the motor and each end of the axle or shaft 29 carries a large and relatively Wide faced pulley 57 over which the sanding and polishing belts D operate. The forward end of the belts run over small pulleys 58 which are carried on opposite ends of a transverse shaft 59 j ournaled in bearings 60, said bearings being capable of adjustment longitudinally of the machine for the purpose of tightening the polishing belts D. The adjustment is accomplished by means of horizontal slides 61, which are connected at their rear ends by means of a transverse bar 62 and have slots 63 at their front end for receiving the bearings 60, the slides being spaced at the by means of set collars 64 on shaft 59 adja-- cent to the bearings 60, and the slides having tongues 65 whichslidably engage corresponding grooves 66 in a central block 67 attached to the bottom of the platform 10. The bar 62 is loosely attached to the front end of an adjustment screw 68 which may be suitably held therein against longitudinal movement independently of the bar, and the screw 68 is threaded through a block 69 held on another cleat or block 70 attached to the lower side of the platform 10. Thus the turning of the screw 68 will effect a movement of the slides 61, shaft 59 and pulleys 58 thereon longitudinally of the machine, or separate adjusting screws may be provided for each of the pulleys 58 as shown in Fig. 4 for tightening the belts independently/ Belts D are arranged to run in a plane very close to the floor and a pair of shoes 71 are provided at the front, over which these belts run, as shown in Fig. 1. Said shoes are pivotally and adjustably suspended from the platform 10 by means of braces 72 and on the shoes may be released by means of a hand lever 72 and rods 73. Each shoe is composed of a plurality of thicknesses of wood, as a, b, '0 and d which are suit-' ably attached together for forming the upper portion of the shoe and are also attached in any suitable manner to the cleat 74:. The lower portions of the shoes are substantially spaced from .the upper portions justdescribed, and are also, composed of a corre sponding number of sections, as at e, f, g, and k, which occupy the same vertical planes as the sections a, b, a and d of the upper portions. Sections a, b, cand d and e, .f, g and h,'a:re respectively hinged together by means of leather strips 75 and the adjacent faces thereof are bored, as at 76, to form seats for springs 77 which serve to resiliently space the blocks of the upper and lower shoe portions. An outer piece of leather 78 is provided. on the outer face of the shoes over which the bolts D operate, thus providing a smooth and practically frictionless surface for the belts. The shoes are positioned directly beneath the pulleys 58 and the for ward faces of the shoes are rounded so as to permit the operation of the belts as close to the walls of a room as possible. For a like reason the belts D occupy-positions at the extreme sides of the platform, as shown,

so that the machine may be run close up to the walls at the sides. The cleat 74 of the shoes only engages the rear. ends of the blocks of the lower shoe portions and by means of the springs 77 independent action is afforded the different sections of the shoes so as to compensate for the unevenness of the floor over which the machine operates. The springs should, however, be sufiiciently strong as to hold the belts D firmly against the floor for obtaining the best results.

The belts D operate over the top of the platform 10 from the rear to the front, thence downwardly over pulleys 58 andshoes 71, thence in contact with the floor and over rear pulleys 57, and-the dust which is formed in the sanding or polishing operation is carried over the floor beneath the belts to the rearof the machine where it is sucked up into the two flattened ends 80 of a blower pipe 81 leading to and connected with the I inlet 82 of a centrifugal blower 83, the ends 80 of said pipe being curved as shown in Fig. 1 to conform to the periphery of the pulleys 57 and terminating at points close to the floor;

The blower 83 is suitably supported on a raised shelf 84 above the main platform and is arranged to discharge the dust into a bag of receptacle 85 connected with the outlet of the blowerby means of a pipe 87. The traction wheels of the machine are positioned between the belts D and intermediate of the ends of the platform so that they in no way interfere with the operation of the belts and the driving shaft 37 is straddled by the steering yoke, so that the pilot wheels may be'operated to a suflicient extent to accomplish a complete turn of the machine.

In operation, the mechanism is started and the' machine is guided over the fioor in a straight path and if necessary returned over the same path until the floor is sufliciently which the machine-may proceed in a desired path. It will be..understood that the machine isdesigned to move at a very slow speed overthe floor but the blower which is operated by a belt 88 operating over the driving belt of the machine and the rela- .tively small pulley 89 of the blower, is de-'.

signed to operate at a rapid speed so as to insure the removal of the dust from the floor. be moderately rapid for good results;

By loosening the belt adjusting means described, the'sand belts may be quickly removed from their pulleys and replaced by other belts from time to time as needed. The blower suction pipes may be also quickly removed from their connection with the blower when the sand'belts are removed, the lower ends of the blower pipes being supported loosely on the upper side of the platform by means of straps 90. 1

The shoes 71, when the machine is idle, may be raised slightly from the floor and the belts D slightly loosened on their pulleys by moving the hand lever 72 forward, the connecting rods 73 attached to the toggle levers serving to; move the shoes slightly backward and upward when the machine is started and the belts D are in operation, the lever 72 may be moved backwardly and locked by a suitable ratchet and sector, as shown, for holding the shoes firmlyagainst the belts and placing tensions on the belts. A hand block 91, as shown in broken lines in Fig. 1, may be used in lieu of the shoes 71, the block being held in the hand of the operator against the inner side of one of the belts Dfor pressing the belts against, the floor, where such may be necessary for a perfect finish.

The speed of the sand belts should ity of resiliently supported elements engaging said belt for forcing said belt into engagement with the floor during the finishing operation, and means for pivotally retreicting said elements, for loosening said be t.

2. A floor finishing machine including movable polishing belt means for engagement with the floor to be finished, and a plurality of non-rotatable and resiliently supported elements engaging theinner side of and adapted to hold said belt in frictional engagement with the floor.

3. A fioor finishing machine comprising a portable carriage having motor operated abrasive belt means held thereon for contact with the floor, a plurality of independently resilient and yieldable members ongaging said belt means and for holdin the same in frictional contact with the floor, means for releasing sald members from said belt, and transmlsslon means for mov;ng

said carriage over said floor.

4. A floor finishing machine comprising a carriage having a motor thereon, abraslve belt means traversing the length of and positioned on opposite sides of said carriage and operated by said motor, a resilient shoe engaglng said belt means at one end for maintaining the frictional engagement of said belt with the floor, and means at the opposite end of said belt for collecting the dust produced by said belt and removing the same from the finished floor.

5. A floor finishing machine comprising a portable carriage having a pair of longitudinally movable abrasive belts operablysupported on opposite sides and traversing the length thereof, a yieldable shoe engaging said abrasive element at one end of said carriage for holding said element in frictional contact with'the floor, means for releasin'gsaid shoe from said belt, steering means and traction means for said carriage, and common operatin means for said abrasive elements and said traction means.

6. A floor finishing machine comprising a power driven carriage provided with a motor, steering and traction means therefor, transmission means connecting said traction means with said motor for forward and reverse movement, a driven shaft at each end of sald carnage, pulleys on sald shafts, a-

movable frame for adjusting one of said.

floor, and means for raising said shoe for loosening said belt.

7 A floor finishing machine comprising a base having traction wheels and steerlng means therefor, transmission means for said traction wheels, a motor for operating said transmission means, abrasive belt means traversing the length of said base and for engagement with the floor, means for opera'bly connecting said belt means with sand transmission means, and a resiliently held shoe for frictionally engaging said belt means with said floor.

8. A floor finishing machine comprising a dirigible carriage provided with-self contained transmission means, a pair of rotatable shafts suspended therefrom having pulleys thereon, said pulleys being held at different elevations, means for relatively adjusting said shafts, abrasive belt means operably connecting said pulleys longitudinally of said carriage for frictionally engaging the fioor, and means for connecting said belts for operation by said transmission means.

9. A floor finishing machine comprising a dirigible carriage having a motor thereon and motor propelled traction wheels for supporting said carriage on the floor to be finished, a motor driven shaft disposed laterally of said carriage, an idler shaft in alinement and relatively adjustable thereto,

an abrasive belt operated by said driven shaft and serving to operate said idler shaft and for engagement with the floor, a shoe held beneath said idler shaft for yieldably holding said belt in engagement with the floor during the finishing operation.

10. A fioor finishing machine comprising a portable carriage having a motor thereon, traction wheels and steering means therefor, a pair of driven shafts disposed in alinement at opposite ends of said carriage and having pulleys thereon, one of said pulleys being raised substantially above the surface to be polished, said shafts being rel-' atively adjustable, abrasive belt means operably connecting said pulleys longitudinally of the carriage, a yieldable shoe supported beneath said raised pulley for bold mg said belt means in frictional engagement with the floor to be finished, and suc:

'tion means at one end of said belt means for chine.

WALDEN G. JOHNSON.