US1652820A - Scraping machine - Google Patents

Description

Dec. 13, 1927.

W. F. EVANS SCRAPING MACHINEl Filed Jan. 1o, 1927 D M .LA ,o o

Patented Dec. 13, 1927. l UNITED STATES PATENT OFFICE.

WILLIAM F. EVANS, OF ANDERSON, INDIANA.

SCRAPING MACHINE.

Application led January 10, 1927. Serial No. 160,197.

This invention relates to improvements in Opening in the head portion of said cup. machines for scraping or smoothing and has Journaled in the head portion of said cu especial reference to machines of this kind is a power shaft which is adapted to be intended for the scraping or smoothing of actuated 'by a driving shaft from an electric walls or ceilings which are incumbered with motor, or from any other suitable source of mutilated and fragmentary remains of wall power. Secured to t-he frontal portion of the paper or like surface coverings. power shaft is a cutter device consisting of The removal of such material by the use of a spider having an annular rim of diameter hand tools is not only tedious and time conto loosely occup the bore of the easement l0 suming but is generally accompanied by at its mouth andY being provided with cutter disagreeable and injurious odors and dust. blades whic register on a plane substan- There is also the soiling of the wood-work tiallyco-incidental with the plane of the and oors, and more or lesschipping or mouth of the easement. At the rear of the nieking of the wall surface which even then Said cutter device a fan wheel which is is not entirely ridden of small fragments secured to the said power shaft is operable of paper. to gather the dust and shavings produced The object of this invention is to provide by the knives, and to discharge same from a portable implement or machine tool by the cup. A handle element or housing which the above named disadvantages may which is secured to the easement is of form be overcome, and which machine, while beto enclose a driving shaft which may coning relatively small in size and light in Sist of a iexible shaft from any suitable weight, is highly efficient, and is capable of Source of power, or from the shaft of an being operated by a person of only ordinary electricmotor which may be enclosed in the Skill, handle element or housing adapted to be A form of embodiment of my invention lu-ld by the operators hand. An annular which is considered desirable for the general anti-friction bearing between the peripheral purposes for which it is intended, is that portion of the cutter element, and the base shown in the drawings, and described in the rim ofthe dust cup, is provided. A rcs-.supe following specification. The invention is clement arranged between the housing eledefined in the several claims. The several mentand the dust. cup is operable to vary the parts of my invention are identified by suitposit-ion of the dust cup to cause the cutter able characters of reference applied to them device to operate on a plane beyond the in the several views in the drawings, in plane of the mouth of the Casement. which- The metal easement A is about 4 inches Figure 1 is a side view of my improved in diameter and has the annular lip A1, and scraping machine, a portion of the handle the lmachined 4annular flange A2. Spaced or motor housing being broken away, and studs A3 secured in the walls of said casethe easement being shownin cross-section. ment erform the functions to be presently Figure 2 is a sectional top plan view taken descri ed. A cast frame structure which is on line 2-2 in Figure 1. made of form to loosely occupy the bore of Figure 3 is a sectional top plan View taken the said easement, and which is designated on line 3 3 in Figure 1. as a dust cup consists of a head plate B,

Figure 4 is a view of Figure 1. taken `in wallsC and base ring D. In the head plate the direction of arrow 4 in Figure 1, a poris provided a, discharge opening E, as shown tion of the easement being broken away. in Figure 2, and which has the upstanding Figure 5 is abottom plan view Figure 4. li E1. A central boss B formed integral The present form and construction of mawith the head plate B, constitutes a bearing chine for carrying my invention into effect, for the power shaft F which is retained in comprises a cast aluminum easement having said bearing by a shoulder F. Hub G a cylindrical bore `and being provided with which supports the fan vanes H and H, is a smooth mouth rim, which is adapted to secured to the body portion of the said power lie against the surface which is to be scraped. shaft. On the forward end of the power Retained in this easement against` rotashaft Ais, secured the hub J of a spider like tive movement but movable longitudinally,Y structure whose spokes J1 support annular is a cu shaped frame element which may be rim K. Secured to each of the spaced seats term a dust cup, there being a discharge K1 of said rim K, is a. cutter blade L. Seatthrough the anti-friction bearing element M ed in an annular' seat of the rim K, is a ball race M which constitutes an antifriction bearing between the said cutter element and the base ring D of the dust cup walls. Spaced slots Cl in the walls of the dust cup loosely engage the studs A3. With the hub J secured to the power shaft the severalparts just described are retained in the assembled form as shown in Figure 1.

In the shouldered end of the power shaft F is a central angular recess F2, into which an angular stem N1 of the driving shaft N is engaged.

To the casement A there is secured a handle element by which the machine as an entirety maybe held and manipulated by the user. The present machine being designed to have its driving shaft N actuated by an electric motor connected at position close to the said Casement, the handle element is made to serve also as a frame or housing for the motor, and it may be designated as a housing O. The machined annular flange O1 of this housing -is secured by cap screws O2 to the flange A2 of the easement.

Formed integral with the said housing is a discharge conduit P whose downwardly disposed lips PI are of contour and depth to register with and to close the opening between the said conduit and the opening E of the head of the dust cup. The discharge portion 'of said conduit P is composed of nozzles P2. To these nozzles, suitable hose pipes that extend to a dust receiving bag or receptacle (not shown) are to be attached. A boss Q of a cross member Q1 of the housing frame, has its body portion threaded. On this threaded body portion is disposed a pressure sleeve R -whose lower face engages a suitable seat in the head plate B of the dust cup. A handle bar R.l extends from said sleeve through a suitable opening or slot O3 therefor in the housing. The threads of the said boss Q are of such pitch that a movement of the bar R1 only a slight distance obtains the desired pressure against the head plate of the dust cup.- For operating xthe machine on ordinary wall surfaces, the sleeve R is set so that the cutting blades L project very slightly beyond thc plane of the mouth of the easement.

It is obvious that the operative may obtain a very eifective and equable pressure on the cutting blades L, the thrust therefor being transmitted from the base ring D and the peripheral portion of the spider element which carries said blades. While the said blades are, in the present structure, set in radial alignment, it is obvious that they may be set at an angle, or at an incline. The shavings or cuttings produced by the said blades readily pass between the spokes ".Ifof `thfelgspider frame whence they are drawn away-by the fan device. While a positive and effective cutting or scraping is obtained, the machine is free from vibration or dancing and is steady and dependable in operation. The shavings, dust particles and efliuvia rising in the dust cup are caught by the fan wheel and blown through the discharge conduits E and P. From the nozA Zles P2 which lead from the discharge open` ing P, suitable pipes may be extended to a bag like receptacle (not shown) which the 5 operative may carry on his shoulder. No preparatory treatment of the wall surface is necessary. My improved machine is simply set in motion by attaching an electric conductor tothe plug connection T. The pressure sleevel R having been adjusted so that the cutting blades L are at the correct cutting plane, the operative moves the machine along the wall surface. The material being scraped from the wall being retained against escapement into the air, the work of scraping the wall is rendered sanitary, and the soiling of wood work and the floors is prevented.

I am aware that my invention may be embodied in mechanisms of-detail and structure different from that shown in the present drawings and specification, and within the scope of the invention as defined in the appended claims, without departing from the spirit of the invention.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A scraping machine of the kind described, comprising a easement having a 10 mouth to engage the surface of the object to be scraped, a cutter element operable at said mouth, a dust receptacle frame in said easement to receive the scraped contents and having a discharge opening, the said 105 receptacle being held against rotative movement but being free to move longitudinally,

a fan element to discharge the contents of said receptacle, a handle element securedY to the easement, an anti-friction bearing be- 11 tween the cutter element and the said dust receptacle, a driving means to drive the cutter element and fan element, and a device to move and hold the dust receptacle frame at varied projected positions.

2. A machine of the kind described, comprising an open easement havinga mout-h to .engage the object to be scraped, a. cutter element operable at the mouth of the casement, a dust receptacle retained in said case- 12 ment held against rotative movement but free to move longitudinally, and whose forward end is in anti-frictional bearing engagement with the cutter element and which said dust receptacle has a discharge opening therein, a. fan element to discharge the contents of said cup, a handle frame element secured tothe easement' and having a discharge conduit to communicate with the discharge opening of Said dust receptacle, a 13 vided with a mouth to engage the surface of.

the object to be scraped, a cup shaped frame retained in said easement and having a discharge opening therein, a power shaft eX- tending through the head plate of said cup frame, a cutter element secured to the said shaft and operable at the mouth of said casement, any anti-friction bearing between the cup frame and the said cutter element, a fan element sec-ured to the said shaft and adapted to discharge the contents of said cup frame, and a device between the casement and housing structure and the head plate of the cup frame to vary the position of the latter longitudinally of the casement.

4. A scraping machine of the kind described,.comprising a Casement havingcylindrical bore, a cup shaped frame loose in said bore there being a discharge opening therein, a power shaft journaled in said cup frame, a cutter wheel actuated .by said shaft and having its knives operable at the mouth of said casement, an anti-friction bearing between the peripheral portions of the cup frame and the cutter wheel, a fan wheel operable inside the cup frame to drive the contents therefrom, a motor housing secured to the Casement, and means to varyg the distance between the said housing and the said 5. A machine of the kind described, comprising a easement having a cylindrical blow the contents of the cup through the discharge opening, a motor housing secured to the said easement, a driver shaft actuated by the motor and being adapted to flexible engagement with the aforesaid power shaft, an anti-friction bearing between the peripheral portions of the cup frame and the cutter wheel, and a device operable from outside the easement and housing, to move and to hold the cup frame at positions adjusted longitudinally of the easement.

6. A scraping machine, comprising an open easement having a cylindrical bore, a housing associated lwith said easement, a driver shaft journaled in said housing, a cup shaped frame having its head plate provided with a discharge opening and its base ring being of diameter to register with the bore of the easement, means to hold the cup frame against rotative movement and free for movement longitudinally of the easement, a power shaft journaled centrally of said cup frame, and adapted to receivegexible connection with said driver shaft, a cutter wheel secured to said power shaft and being of diameter to occupy the mouth portion of the bore of the Casement, an annular antifriction bearing ring between the peripheral portion of the cutter wheel and the base ring of the cup frame, and a device between the housing and the cup frame to vary the position of the cutter wheel relative to the plane of the mouth of the Casement.

7. A machine of the kind described, comi prising a easement having open forward end, a housing secured to said easement, a motor in said housing, a pressure frame mounted loose longitudinally in said casement and which is held against rotative movement, a power shaft journaled and retained in said pressure frame, power transmitting connections between the said power shaft and said motor, a rotary cutter secured to said shaft, an anti-friction bearing between the end'of the pressure frame and the said cutter, and an adjuster` sleeve between the pressure frame and the housing, to vary Y the position of pressure frame longitudinally of the easement.

WILLIAM F. EVANS.

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