US2507052A - Surface finishing machine - Google Patents

Description

May 9, 195o A. P. ROBINSON 2,507,052

SURFACE FINISHING MACHINE Filed June 13, 1947 3 Sheets-Sheet l @L 7.9/6/ gf-fl /m/EN T012 H1. 55m l? Poe/fvwm firme/YE y.:

N O S m B o R R A SURFACE FINISHING MACHINE 3 Sheets-Sheet 2 Filed June 13, 1947 May-9, 1950V A. P. ROBINSON 2,507,052

l SURFACE FINISHING MACHINE Filed June 13, .1947 K 3 Sheets-Sheet 3 Patented May 9, 1950 UNITED STATES est' GFFICE SURFACE FINSI-IING Albert P; Robinson, SeattlmWash.

Applica-tion Jnell'S, 1947, Serial'No. '754,366A

(Cl. 50i-417) It is the principalY object` of this invent-ion` tof provide means foruse with grinding apparatus.,` that makes a faster andxoetter nishing opera-A tionpossible, without anydanger-of gouging, or marring a surface by reason of improper holding` of the grinding disk', andfal'sorelievesthe opera-V tor of theheavy strain of holding the grindingf machine. in a dennite position for the specific Work being done.

Explanatory tothe invention,.it willy be. here: stated that in the nishing or surfacing of floors, baseboards, stairways, etc., of terrazzo orfthe like, itis usually the case that .a'revoluhly driven grinder ofdisk-like form is employed. This: diskis fixed on the drive shaft of a motor, andthe motor housing is equipped with handles whereby' the operator hold'sand guidesthe device inruse. To insure an even', smooth .surfacethat is free-oiy irregularities or disk marks', .it isnecessarythatthe# grinding disk be' held` perfectly .at againstthe surface `being nished; fork ifitfshould be tilted to onesidelorthe other, it isquitexaptto lquickly cut-V an arcuatel groove that' .defrnagingl to the; surface'iand detrim'entalto itsfappearance; Furthermore, .the holding'of the grinder `inV the proper position by' hand is a strain on the operator and`r becomes quite exhausting. especially when machines of' large' size are" used.

In view ofithe foregoing. explanatory matter. itha's'been one of the-principal objects ofrthisi inventionto provide a light; substantial frame structure, that maybe :easily skidded on thesuri: facebeing iinished or: adjacent thereto, and. in which the grinder may be placed and secured in proper position for the nishin'g of a surfacefth-us to'mechanically ho'ldthe grinder tofinsuren the desired evenness of the surface'finish and valso torelieve Ythe :operator of the heavy strainof holding 4 the-machine against that' tiltingfor improper po sition that `would'result inA damage to .a surfacebeing .finished .Itis alsoy an .object of the inventiontoiprovidef' risers, base moldings, eta, or fonother Vuses;

Still another object of the invention istoi'pro-' vide a frame structure in which the grindingmachine may be adjustably secured for Woriron3 floors, or other horizontal surfaces, and which frame may be turned on its side with grinder mounted therein, to support thev grinding-disk properly for operation von Vertical sunfacespsuch`v as baseboards.; stair risers, and the like.

Still further objects of the invention residein" the .details of construction and combination of parts embodiedinthe combination-of grinderandff frame, and inthe modeof usenand operatiorrasv will. hereinafter be described;

In accomplishing the above mentioned` and other objects: oi the invention, I have.' provided the improved details of construction, the pref ferred Yforrns oi which are illustratedin theaccompanyingA drawings, wherein- Fig. 1 isa-plan; or top view of Ya` surfaceiinishing machine yembodied by the present invention.

Fig. 2 isla side viewof` the same showing the grinding'machine as supported in position for fmishin'g ancor surface.

Fig. Sis a forward endview of the grinder andl the supporting frame structure,` a-s positioned forl surfacinga baseboardor vertical surface.

Fig. 4 isa cross-section, taken on the 'line lle-4i supporting frame structure, showing the'adjust# ment ofthe grinding machine for a floor sandingv operation.

Fig.; 7 is an end View of the machine showing?l the position of the grinder for a stair riser sur.-4 facingl operation.

Fig'. 8-isanfelevation of a machine oframodi.V`

ned for-In.

Referring :morein detail to the drawings-- First, it will .be explained that in the present? combination-i contemplate using motor driven grinders like, or similar to, those noW- in general useforl door surfacing operations, and altering them only to the lextent necessary to adaptthem' for use inthe presentv supporting and. guidingframe structure. invention, that the means for supporting.y the grinder infthevframe Ybe. oiV such. character;that.'A

the-latter may be easilyv and readily disposed in the .frame at any necessary or advantageouspo@I sition. The-,function of the frame structure, Pri marifly, is to holdthe grinder. at such-level'opposi tion that .theigrinding disk will natly engagelwithi the-'surface being finishedand not lallovifgedfto Also, it is theintent inl this' gouge in; however, it serves additionaly as a means of sustaining the weight of the grinder that is usually held by the operator. Furthermore, by reason of the adjustability of the grinder in the frame, the grinding stone can be held at any set position of inclination as required for any specic work.

In the drawings, I have illustrated one common type of grinder, designated in its entirety by reference numeral ID, and it comprises an electric motor within a motor housing of cylindrical form, designated at A gear case |2 is fixed rigidly to what will be referred to as the outer end of the motor, and a tubular portion I3 of reduced diameter, serving as a handle, extends from the inner end of the housing I I. Other handle members i4 and |5 are fixed rigidly to the parts and I2 for convenience in the handling of the machine in use, especially when the grinder is used independently of the supporting frame structure.

Extended downwardly from the gear case l2, is a motor driven shaft I5 and mounted on this is a grinding disk Il. This disk surface lies in a plane parallel to the longitudinal axis of the housing IU. As seen in Fig. 1, the grinding disk is of such diameter that it extends substantial amounts to opposite sides of the housing i0 and also forwardly of the gear case I2.

The frame structure in which the grinder is supported for use, as noted best in Figs. 1 and 2, comprises parallel, horizontally extending, opposite side shafts -2B, between which two cross rods 2| and 22, are extended; each of which cross rods is equipped at its opposite ends with fittings 23 that are longitudinally slidable on the shafts 2li-20. It is upon the cross rods 2| and 22 that the grinder is operatively supported vfor use, as will presently be more fully described.

Secured rigidly to the opposite ends of the shafts 23 and 2E), are vertical, tubular members 25, each of which has a frame supporting leg 2S adjustabiy contained therein. Each leg is in the form of a solid rod that extends at its lower end from its containing tube E, and at that end is equipped with a shoe or runner 2S of a type that is easy to slide or skid upon a floor surface. For purpose of vertical adjustment of the legs 2E, the upper end portions of each of the tubular members 25 are longitudinally split and equipped with clamp screws 29 adapted to be tightened for the securernent of the legs at any position of adjustment as may be required to properly engage the grinding stone of the grinder supported on the frame with a surface being worked on.

The upper end portions of the rods or legs 26 are equipped with rack teeth 3| formed therealong and cross shafts 32 are extended between legs at opposite sides of the frame and revolubly held at their ends in bearings 33 on the upper ends of corresponding tubes 25. These shafts are equipped with gear pinions 34 at their ends in mesh with the rack teeth of the legs to provide for making simultaneous and equal adjustments A hand wheel 35 is fixed on each shaft for turning it in making an adjustment.

The grinding machine, comprising the motor, its housings E I and |3, the gear housing I2 and disk are designed to be handled as a unit, and to be functionally mounted in the frame structure. The means of support for the grinder comprises the two cross rods 2| and 22, which, as previously stated, are adjustable along the opposite side shafts 2li-29 of the frame. It is shown best in Figs. 4 and 5, that bearing rings or bands 40 and 4| are xed about the motor housing parts II and |3, near the forward and rearward ends of the grinder and these bands have spherically curved outer surfaces and are tted for turning in enclosing bearing bands 43 and 44 that, respectively, are mounted upon the cross rods 2| and 22.

It is shown in Fig. 4, that the band 43 is equipped at its lower side with a longitudinally split bearing portion 43x that is mounted on the cross rod 2| for endwise shifting thereon, and this portion is equipped with a clamp screw 45 for securing it at any set position. The band 43 also is -cut at the top, as at 46, and a clamp bolt 41 joins the ends across the joint for drawing the 'band tight to secure the motor against movement after a rotatable adjustment thereof has been made.

Likewise, it is shown in Fig. 5, that the spherically surfaced band 44 which is fixed about the smaller end of the motor housing I3 is rotatably contained in a collar 44 that, at opposite sides has bearing portions 5I5| that are vertically adjustable on parallel, vertical posts 52-52 fixed in a bearing member 53 that is mounted on cross rod 22 for adjustment transversely of the frame. This bearing has a clamp bolt 54 associated therewith and adapted to be tightened to hold the bearing at any set position of adjustment.

It is to be understood that the described means of support for the grinder permits it to be ro.- tatably adjusted on its longitudinal axis for the lateral tilting of the grinding disk, and also permits the forward end of the motor to be swung laterally to either side of the frame, for example, to positions corresponding to the dotted line position shown in Fig. l. Furthermore, the mounting permits the up and down adjustment of one end of the grinder, for example, as shown in Fig. 6, as required for sanding a oor surface; a special sanding disk, of flexible character being used for this work.

The supporting frame structure, also, is equipped at opposite ends with upper and lower tubular cross rods and 6I xed at opposite ends to the vertical members 25. Adjustably mounted in the opposite ends of these tubular members are gauging or guiding shoes 65, with at outer surfaces adapted to engage in sliding contact with a wall or floor to insure against the grinding disk being gouged into a wall surface. These shoes, also, are designed to serve as supports for the frame when it is turned on its side for use as has been indicated in Fig. 3. The guide shoes have mounting rcds of substantial length telescopically contained in the cross rods 60-6l and set screws 66 are applied to the cross rods for tightening against these rods for the securement of the shoes at any set position of adjustment.

Assuming the parts to be so constructed and assembled, the use of the grinder in this combination would be as follows:

First, the motor housing would be properly equipped with the bearing bands 40 and 4I, and the proper or a selected grinding disk Then the device is secured in the frame by seating the bands 40 and 4| in their respective bearing bands 43 and 44. The latter bands are then tightened to rigidly secure the grinder in its frame and the legs 26 are adjusted vertically in the tubular guides 25 so that, by means of the frame. the grinder is held secure and the surface of the disk I'I is located in proper grinding relationship e me fiar surface. with the we se .een Phe grinder is set in position, arid is ,in ly Skidded'back andfcrth on the fio'or ui'face'duif ing the lgrinding operation,` bei'rigf'heldpro ly in place at all ltimes the frame in lieu. of having to be held by the operator; Thus,V the chance of gouging and uneven grinding elimihated ay d' the'eort of collars and"4|',"which are secured to the motor housing, may turn freely inthe clamp rings because of their spherical outside form. In this adjustment, the cross' rods 2l and 22 will automatically adjust themselves in spacing on their supporting shafts. Set .Screws 110 .in the fittings 23 may be tightened against the shafts 520e-ezt! to secureA the adjustment.

' It is indicated Aalso in Fig. 1, that thegrinder mightbe shifted endwse so that :the disk might project forwardly of the frame, as to the dotted line'pcsition of the disk designated at Ilya Since it may, at times, be advantageous to use the grinder independently of the supporting frame structure, I have provided for its quick and easy detachment from the frame merely by the withdrawal of the cross shafts 2l and 22 from their fittings 23. Ordinarily the cross rods are secured by cotter keys passed through their end portions as at 'l2 in Fig. 2.

With the grinder secured properly in the frame structure, it is possible to manipulate it in the usual manner for any oor surfacing operation. The operator may grasp the framework or the handles of the housing for the movement of the grinder on a floor. The advantage of its use with the frame resides in the fact that it is impossible to tilt it to any position at which the grinder disk can damage the floor; even grinding is insured, and the heavy strain on the workman of holding the grinder in proper position is avoided.

If work is to be done close up to a baseboard, the grinder is first adjusted to one side of the frame, as indicated by dotted lines in Fig. 1, then the shoes 65 at that side are extended for guiding contact with the side wall surface so as to eliminate possibility of gouging or the disk cutting in too deep.

When it is desired to grind the face of a base-V board or other vertical surface, the frame structure may be turned on its side, as in Fig. 3, so that the shoes B5 at one side then become the frame supporting skids. The shoes or runners 28 may then be extended as wall contacting guides. Adjustments for properly positioning the grinding disk I1 are made as previously explained and operation for this job is substantially as for the surfacing of a floor.

For the surfacing of undercut stair risers, the frame is laid on the side in the same manner as for baseboard grinding and the motor is then rotatably adjusted about its longitudinal axis, as has been illustrated in Fig. 7, to bring the grinding surface of the disk I1 to a proper degree of inclination. Work is then carried on as for base surfacing. Also, by reason of the adjustability manually l h'lfding the' Eig 8 illustrati-,esa modif-led or alternative Aform of devicewherein a `fratrie .structure substantialiy ted 'is employed. A motor l ss rods tlfor rotatable .adr vertical agis, and the'grindnig y i citarnei aradiaiiv directed arm 83 may be 'swung to advantgeus positions.

t in the useof machines be made whereby l,the oiaticaliy lifted clear. s utile' off of power. Such .a mechanism ,duld' be rmanually or' au onia cllv erated. y

Having thus'v described my invention, .what I' claim new therein,4 and dsire .to 'secure by Lettere Peten?, 1.S= m' 1: The .combiner face 'iini'shin nachineoff portable .type 4 ing a liqusiiig, lar motor ven -shaft extended from the housing land a 4Ence xed ,tie-Sna ,tfif ,a siipilt 'guided-:Cor th'mchine ctznprising'r an' open 'frame structure for the reception of the machine therein, means for the securement of the machine, in different working positions, in the said open frame structure, and surface engaging runners adjustably fixed on said frame structure and whereby the machine will be sustained while in functional use and the disk held in a definite relationship to the sustaining surface; said means for securement of the machine comprising a band for encircling the said housing and adapted to be tightened thereabout, and a cross support in said open frame on which said band is fixed for tilting adjustment to change the working angle of the disk.

2. The combination with a power driven surface finishing machine comprising a housing, a motor driven shaft extended downwardly from the housing and a surface finishing disk fixed to the shaft, of a support and guide for the machine comprising an open frame structure adapted to receive the machine therein, and including means for the securement of the machine in working position therein, and runners mounted by the frame at opposite sides and ends of the machine, whereby the machine will be sustained in working relationship to the supporting surface; said runners being adjustably mounted on the frame to maintain the disk in a working relationship to the surface being finished thereby; said means for the securement of the machine in said open frame comprising a cross-support in said open frame, a band encircling the said housing and equipped to be tightened thereabout, and tiltably secured to the cross support, for angular adjustment of the machine, and a vertically adjustable support for the machine fixed in the the housing and :a surface iinishing disk Xed to the shaft, of a support and guide for the machine comprising a, rectangular, open frame structure, adapted to receive the machine therein and having corner posts and horizontal bars rigidly connecting said posts along opposite sides of the frame, cross supports extended between opposite side bars, means for adjustably xing the said machine thereon with its disk in working relationship to the surface to be finished, runners mounted at the four corners oi the frame for sustaining the machine in use and adjustable to maintain the disk parallel to the surface and at a. designated working elevation.

f 4; A combination as recited in claim 3 wherein the said cross supports are slidably adjustable along said horizontal bars to dispose the grinding disk beyond or within the end of the said frame structure.

' 5. A combination as recited in claim 3 wherein the said cross supports are slidably adjustable along said horizontal bars to dispose the grinding disk beyond or within the end of the frame structure, and wherein said machine is angularly adjustable on said supports to locate the disk at one or the other side of the said frame structure.

6. The combination with a power driven surface finishing machine comprising a housing, a motor driven shaft extended therefrom and a surface nishing disk fixed to the shaft, of a support and guide for the machine comprising an open rectangular frame structure comprising corner posts, horizontal rods connecting said posts atV sides and'ends of the frame, cross bars mounted on the horizontal rods at opposite sides and slidably adjustable therealong, means on said cross bars adjustably fixing the said machine thereon in working position, and runners at the, lower ends of the posts to support the machine at proper working level for iioor surfacing operations, and other runners on the sides of the frame for guiding contact with a wall or for functional support of the frame and machine when laid on its side for baseboard surfacing operations.

'7. A machine as recited in claim 6 wherein the said runners are adj ustably mounted on the frame and said machine is rotatable in its mountings to adapt the positions of the disk to different positions of the frame.

' j ALBERT P. ROBDISON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 48,062 Harsha June 6, 1865 589,006 Manning Aug. 31, 1897 1,224,943 Lux May 8, 1917 1,340,991 Tabor May 25, 1920 1,772,636 Re Qua et al Aug. 12, 1930 1,799,109 Lyne May 31, 1931 2,201,420 Zschan May 31, 1940

Images