US1442544A - Floor-scraping device - Google Patents

Description

Jan, 116, 1923, 11,442,544

A. SCHWENKE. FLOOR ScRAPms DEVICE. FILED JUNE 21 1920.

3 SHEETS-SHEET I Envani'or:

Jan. 16 1923. 115442 544 A SCHWENKE. FLOOR SCRAPING DEVICE. FILED JUNE 21. 1920.

3 SHEETS-SHEET 2 lm/enmr:

Jan. 16, 1923.,

A. SCHWENKE.

FLOOR SCRAF'ING DEVICE.

Flu'zp JUNE 21, 1920.

3 sHEErs-SHEET 3 Patented r.lan. l6, i923.

are

ALBERT SCHWENKE,

i a e nr rr tartan.

BERLIN, GERMANY.

FLOOR-SCRAPING DEVICE.

Application filed June 21,

To all 10 71-0922. it may concern Be it known that I, ALBERT ScHwnNKn, a citizen oi the German Republic, residing at Berlin, Germany, have invented certain new and useful Improvements in Floor-Scraping Devices (for which I have filed applications in Germany, Nov. 17, 1917, and Dec. 24, 1919), of which'the following is a specification.

My invention relates to a portable scrap ing device of the kind known per se for parquetry and other flooring, in the case of which there are arranged Itwo scrapers, adapted to operate in opposite directions and fixed to angularly shaped levers pivotally lodged in the frame of the device.

Now in these known kinds of scraping ap paratus, the scrapers are secured in the posi tion assumed for the time being by spring action. However, this has proved to be disadvantageous for the reason that when the scrapers are disposed in the manner indicated it will be impossible to obtain a perfectly smooth scraping surface.

The essential feature of my invention resides primarily in so arranging the bent levers supporting the scrapers that these latter may be rigidly adjusted at various angles relatively to the frame, while however retaining the advantage that the operation of setting the scrapers at the incline desired may be G'lliBCiBd quickly and readily.

The main features of the aforesaid arrangement oi? the bent levers reside inv the fact of these two levers being connected by means of a turnbuckle, and of each of these levers being furthermore suspended to the top plate of the frame by aid of a screw bolt adapted to be set in the longitudinal direction. t thus follows that, by suitably adjusting the length of said bolts, as also by correspondingly setting the turnbuckle, the scrapers may be set at such an angle relatively to the vertical that they will no longer be able to present any resiliency in either direction. Again, whereas in the known type of floor scraping devices having two scrapers, the transmission of the power about to be exerted on the scrapers is effected by the very same spring means serving to set 1920. Sci-m1 No. 390,592.

said scrapers at the angle desired, it will not be necessary, in the case of a floor'scraping device in accordance with my invention, in order to transmit the power produced by the handles to employ special bent levers fixed to said handles and connected to the scraper carriers. lvloreover, in order to be able to directly transfer the power on to the scrapers so that these will be actually forced against and moved along the floor with a force acting jerk-wise, it will prove necessary that the power transmission levers be directly connected to the grip plates, screwed to the carrier levers, in such wise that they will be enabled to engage said plates slightly above the floor.

In the case of power transmission levers of this construction, it will prove expedient to interconnect springs between said transmission levers and the handles for the purpose of balancing the working into play.

For the purpose of limiting the extent of the tension, there is arranged in the longitudinal direction of the device in accordance with this invention, in front of each scraper a stop roller adapted to be raised, counter to the action of a spring, for an adjustable extent relatively to the member supporting it, and which after having been raised bears up against an adjustable stop.

An embodiment of the subject matter of this invention is shown by way of example in the accompanying drawings, the form oi execution chosen being that oi an apparatus adapted to be moved by hand. However, the device might also be moved with equal efi'ect either by means of an electromotor or a compressed air motor, in which case the attendants would merely be required to force the scrapers against the floor and to govern the movements of the apparatus.

In the drawings Fig. 1 is a longitudinal section Fig. 2 a plan, and.

' Fig. 3 an elevation of the device.

In the scraping device disclosed in the drawings, which is intended to be operated by two persons, there are pivotally lodged at the two ends of the top plate a. ot' the frame, two handles into the upper extremity of each of which there is screwed a T-shaped handrip c. The frame of the device is supported on two wheels (Z, and is provided with bent levers f, disposed to rotate on pivots c, serving carriers for the scrapers Each of the bent levers f is provided with two depending extensions 1, to the extremities of which there are lined tapped members i, of which two are always interconnected by means of a turnluiclde 1'. To each of said bent levers but at a distance fairly remote from the center, there are in addition arranged two screw boltsl extending through Oval opening an. 'i' ormcijl. in the top plate a, and having nuts 1:, by the setting of which the space between plate a, and bent levers may be suitably ad.- justed whereby said levers are caused to be oscillated around the pivots c. It is ohvioru-a that when setting the bent levers the tapped members 1 will likewis have to be correspondingly shortened or respectively, extended by means of the turnlmcliles 7;. in. Fig. 1 there is shown in dotted line the position into which the levers f may be displaced relatively to that shown in fulllincs. The difiercnt incline at which the scrapers must be set relatively to the vertical, depends of course upon the hardness ofthe flooring to be scraped. In the place of a check nut, the screw bolts Z are proflded with coil springs 0 which, when the nuts a are screwed upwards, will automatically force the bent levers f downwards.

In true correspondence with the setting of nuts a and of the turnbuckles Z1, the scrapers g are set at the respective incline so as to be incapable of any movement, since a rotation of the bent levers f in the upward direction is rigidly prevented by the turnbuckle 7c, and in the downward direction by nuts 91. The outer faces of levers f are obliquely di rected toward the central axis of the floor scraping device, with the result that likewise the scrapers r fixed to the bent levers f by the grip plates 7) will come to be disposed atan angle relatively to the center line of the scraping device, as shown in particular in Fig. 2. The grip plates p are connected to the bent levers f by means of screws. The said plates are provided close to their lower edges with screws 9 serving for the attachment of two bent levers 1, each of which communicates with one of the handles 6. 1ntermediate the extrei'nity of each of said levers 7" and handle I) there is interconnected an aggregation of compression spring means each of which is composed of two springs s. The said aggregation comprises two cross pieces t and u, the upper to of which may be fixed to the handle I) at different heights thereof by means'of a perforation anda setting screw o. Intermediate the two cross pieces t and u, there are arranged screw bolts 3 adapted to be ad usted in their long1tu dinal direction by means of wing nuts m, and around which bolts the compression springs a are disposed. The bores 14 forming passages in the upper cross piece it for the screw bolts 0 are oval in shape in order to enable the screw bolts :e to assume a certain obliquity relatively to the cross piece 14, such as will be required when the handles 7) along with their hand grips are to be set at different heights. The springs s serve to balance the working pressure produced by the handles and transmitted on to the scrapers. On the levers 1" there are fixed at a certain distance remote from the scrapers members 1 supported on rolls. l Vithin said member 1, the spindle 3 of a roller 4 is shiftably disposed, a spring 2 serving to keep said spindle down. This spindle is moreover provided with two cross pins by aid of which it projects through slots formed in the memher 1. By these-means, the lowermost position of the roller 4 is limited by the stops formedby pins 5, as shown in Fig. 1. A nut G is screwed on to the member 1 in a manner permitting shift in an altitudinal direction; the lower face of this nut thus servingto restrict the upward movement of the roller l relatively tothe member 1.

It follows that. as soon as working pressure is exerted upon the scrapers a, the roller 1 within the Supporting member 1 will primarily be forced upwards countertothe action of spring 2, and this until the cross pins 5 have come to abut against the nut 6. By this abutment there will thus at the same time be limited the degree at which the scrapers a. are pressed against the flooring, and therewith also the thickness of the chip severed ofl. Hence, by displacing the nut 6, the thickness of the chips may be variously adjusted. The cutting edges 7 of the scrapers are curved, as disclosed in Figs. 2- and 3, so that th'escrapers will only enter into actionwiththeir central portions whereby any possibility of the lateral portions of the scrapers catching, in particular in the case of uneven or sloping floor surfaces, isprcvented.

Owing to the inclined position assumed by the scrapers a relatively to the center line of the device, on this latter being guided or moved along a perpendicular plane with regard to, say, the inlays of an inlaid flooring, the scrapers will come to be applied to the fibres diagonally, thereby preventing the liability of the wood splitting. Vhat is more, by thus arranging the scrapers at an incline, the possibility is given of removing the chips along the sides of the apparatus.

The hand grip c at the extremity of each handle Z) consists of a: central portion and two gripping members 8 fixed, say by screws, thereto. Each of said members 8 may be screwed ofi' separately, so that on one of these handles being removed, the apparatus may be moved directly alongside of a Washboard, with the result that by means of this improved device every section of the flooring, including the outermost edges thereof, may be operated upon.

The device shown may also in so far be modified in that only one handle is provided, so that only one person will be required to work it.

I claim:

1. In a portable floor scraper in combination, a pair of wheels and a wheel axle, a frame horizontally mounted above said axle and a handle' attached to said frame on either side of said axle, a bent lever on either side of and pivoted near said axle, a scraping tool on the free end of each lever and means for adjusting each lever and for rigidly fixing it in position relatively to said frame.

2. In a portable floor scraper in 'combina tion, a pair of wheels and a wheel axle, a frame horizontally mounted above said axle and a handle attached to said frame on either side of said axle, a bent lever on either side of and pivoted near said axle, a scraping tool on the free end of each lever, a lug depending from each lever, a turnbuckle connecting said lugs and a screw bolt on each lever extending through said frame and serving together with said turnbuckle to adjust and rigidly [ix said lever in position relatively to said frame.

3. In a portable floor scraper in combination, a pair of wheels and a wheel axle, a frame horizontally mounted above said axle and a handle attached to said frame on either side of said axle, a bent lever on either side of and pivoted near said axle, a scraping tool on the free end of each lever, means for adjusting each lever and for rigidly fixing it in position relatively to said frame, a link pivoted to each lever and operatively connected with a handle and a spring inserted between said link and said handle.

4. In a portable floor scraper in combination, a pair of wheels and a wheel axle, a frame horizontally mounted above said axle and a handle attached to said frame on either side of said axle, a bent lever on either side of and pivoted near said axle, a scraping tool on the free end of each lever, means for adjusting each lever and for rigidly fixing it in position relatively to said frame, a resilient stop connected with each vent lever so as to limit its downward movement and adjustable means for varying the length of said stop.

In testimony whereof I aflix my signature.

ALBERT SCHlVENKE.

Images