US2154620A

US2154620A - Floor sanding machine

Info

Publication number: US2154620A
Application number: US43516A
Authority: US
Inventors: Iobbi Alfred
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-10-04
Filing date: 1935-10-04
Publication date: 1939-04-18
Anticipated expiration: 1956-04-18

Description

April 18, 1939.

A. IOBBl 221545620 FLOOR SANDING MACHINE Filed oop 4, 1935 2 sheets-sheet 1 enten Il p "l waiter/12g,

April 18, 1939. A [055| 2,154,620

FLOOR SANDING MACHINE Filed Oct. 4, 1935 2 Sheets-Sheet 2 Inventor? l* 1 5 attorney,

Patented Apr. 18, 1939 UNiTED STATES PATENT OFFICE FLOOR SANDING MACHINE v Alfred Iobbi, Philadelphia, Pa.

Application October 4, 1935, Serial No. 43,516

3 Claims.

I have Various objects in mind to be fulfilled in improving a floor sanding machine of the class described. One cf these objects is to provide such a construction of sanding drum shaft and its connections with the housing of the machine, as will enable the operator to quickly release the drum from the housing for making a change in the sanding sheets, while at the same time, affording a positive and reliably fixed connection for the drum shaft with the housing.

Another object of my invention is to provide within the sanding drum, spring-pressed clamping and drawing in means for securing the sanding sheet upon the drum.

A further object is to provide with the sanding drum, counterbalancing means, thereby permitting a greater speed with a balanced drum, so that a shorter drum can be used, having its high speed compensate in action for making the drum shorter for doing the same amount of work as that done by a longer and more slowly rotating drum. Besides I find that an operator can better control his work using a higher speed for the sanding drum.

For equalizing wear on'the sanding sheet and for governing the sanding effect upon the floor, I desire to fix the general position of the sanding drum, relative to the plane of the floor, by using tilting means effecting the mounting of the machine and its drum, relative to the plane of the floor, and I desire to accomplish this object by an adjustment of a single supporting roller, so that the weight of the machine will bear more heavily on one end of the sanding drum than on the other.

Relative to the bag, into which the vacuum device discharges the dust and grit, it is important that the flow passage into the bag be free from any accumulation of dust and grit about its inlet, within the bag. In this connection my object is to form the flow passage in the bag without using a long, stiff inlet pipe, which is used with some bags, risingv within the bag. To form the inlet flow passage within the bag, I desire to set oii such a passage, simply by sewing together, the side walls of the bag, near one vertical end thereof, so as to form the said passage as completely separate from the larger reservoir compartment, of the bag, having the lower end of this compartment slotted in the central plane of the bag, for removing the waste. I provide a releasable closure by using a zipper fastener.

With these and other objects, which will appear hereinafter, my invention resides in certain construction, one embodiment of which is illustrated 5 in the drawings. The Various features of construction are hereinafter described, their functioning is explained, and what I claim is set forth.

In the drawings,

Figure 1 is a side elevation of a complete floor W sanding machine embodying my invention.

Figure 2 is a front elevation of the machine shown in Figure l.

Figure 3 is a vertical section taken on the line 3-3 of Figure 1, showing the machine housing n,

and the adjustable supporting roller.

Figure 4. is a side elevation of the parts shown in Figure 3, having the tilted position of the housing and parts shown in dash and dot lines.

Figure 5 is a horizontal section taken on the 20 line 5--5 of Figure l, showing the bag construction.

Figure 6 is an enlarged elevation of the sanding drum.

Figure '7 is a vertical section taken on the 425 line 1 -1, of Figure 6.

Figure 8 is a front elevation of the fixed sander drum shaft, with its mountings, showing the keying of the shaft at one end with the housing, and the plate retainer at the other end, on the v 30 housing.

Figure 9 is an end elevation of the shaft and housing illustrated in Figure 8, showing the keyed engagement of the shaft with the housing.

Figure 10 is an elevation of the retaining plate :35 with the housing, shown in Figure 8.

Figurell is a front elevation of one of the binder rods with its spring-pressed mountings in the sander drum disc ends.

Figure l2 is a front elevation of the other of 40 the binder rods with the disc mountings, showing its key receiving end.

Figure 13 is a sectional elevation of one of the drum discs, taken on the line I3-I3 of Figure 14. "45

Figure 14 is a sectional elevation taken on the line Ill-I4 of Figure 13.

Figure 15 is a perspective view of a cover portion of a drum disc. l

In the figures, the housing 20 is shown as .50 made of a bent plate, having a top portion 2|, and two depending side portions 2% and 23. Fixed upon the rear end of the top portion v2|, is a handle socket 24, having two transverse holes 25 and 26. The handle 21 fits this socket -65 24, and is secured therein by a cotter pin 28, passing through the handle 21 and one or the other of the holes 25, 26, for adjusting the height of the handle 21. More transverse holes than 25 and 26, can be provided for greater adjustment of the handle height to suit the height of the operator.

Mounted upon the top portion 2|, of the housing 28, is an electric motor 29, to the shaft 30 of which is fixed a sprocket wheel 3|. A low handle 32 is provided at the front end of the housing 28. Hinged to the front end of the housing 20, is the curved cover or hood 33, for enclOS:

ing the upper part of the sanding drum 34.

The machine is supported in front, entirely by this drum 34, to the rear of lwhich are two supporting

rollers

35 and 36, attached to the

respective housing sides

22 and 23, opposite one another. The roller 35 is journaled in ya forked frame 31, which with its angle iron portion 38, is fixed to the side 22, while the roller 36Y is journaled in a similar forked frame 39, which with its angle-iron portion 48 is adjustably attached to the housing side 23. 'Ihe angle-iron portion 40 is pivoted to the side 23, by means of the screw 4|, passing through the forward end of the angleiron portion 4|). A long upright bolt 42 is adjustably held passing through the top of the rear end of the housing 29, by means of the

nuts

43 and 44, while the

nuts

45 and 46 secure the bolt to the rear end of the angle-iron portion 40, of the forked frame 39. The adjustment afforded by this one adjustably attached roller 36, is explained below, after giving a description of the remaining parts of the sanding machine.

Consideringy the construction of the sanding drum 34, and its attachments, referring particularly to Figures 6-15 inclusive, the drum 34 has two

end discs

41 and 48, to which is attached, by screws 49, the cylindrical casing 56, positioned to come between the flanges and 52, of the

respective discs

41 and 48. In each of the Vend

discs

41 and 48, is mounted and secured centrally, a ball bearing 53, through which passes the shaft 54. This shaft 54 has a tongue 55, at one end engaging a slot hole 56, in the housing side portion 22, against which the shaft 54, releasably shoulders. The opposite end of Vthe shaft 54 releasably engages a hole 51, in the housing side portion and butts against a plate 58, releasably attached by screws 59, to the housing side portion 23.

Journaled in the

end discs

41 and 48, against end displacement, is a key rod 68, having a key end 6|, projecting into the outside pocket 62, for receiving a turning key. The rod 68 is cut away to form a depressed ilat portion 63. This rod 60 is positioned within the casing 50 to adjoin and be parallel with the inclined slot 64, through which is passed the sanding sheet 65. Adjoining the rod 68 is a spring pressed rod 66, each end of which is mounted within an elongated pocket 61, having a spring pocket 68, at right angles thereto. Within each spring pocket 68 is a coiled compression spring 69, adjustably held compressed against the end of the rod 66, by the screw 18. Above the screw 10, is an opening 1|, covered by a plate portion 12, of the disc, and is secured to the remaining portion of the disc by the screw 13. This plate portion 12 also serves to support the part o the casing 59, which passes over the opening 1|. The rod 66, being spring pressed against the rod 60, forms therewith .1 ajspring pressed, inside clamp, to hold the sanding sheet 65. Screws 34sl are provided to balance the drum 34.

Fixed by screws, concentric with the disc 48. and next to the housing side portion 23, is a sprocket wheel 14, in the plane of the sprocket wheel 3|. A sprocket chain 15 engages the sprocket wheels 3| and 14, and passes through a slot 16, in the top of the housing 20. A guard 11 covers the sprocket wheel 3| and chain 15, at its upper part. Surrounding the drum casing 50, is the sanding sheet 65, having its ends 92 and 93, pass in through the inclined slot 64 and become engaged by the clamping

rods

68 and 66. Between the sheet 65 and the casing 50 is a thick sheet rubber cushion 18.

Within the housing is mounted the vacuum cleaner 19, with its suction fan and independent motor. Its suction mouth 80, adjoins the sanding drum 34. To the discharge outlet 8|, of the vacuum cleaner 19, is releasably attached the neck 82 of the bag 83, which is hung upon the hook 84, ori the handle 21. The strap 85, attached to the bag 83, releasably engages the hook 84. The bag 83 has an outer edge seam 86 in its central plane. Extending vertically in the side of the wall of the chamber 9| is the zipper closure 81, for releasably opening this part of the bag, to empty the accumulated contents, as 88. I form a vertical narrow passage 89, in the bag 83, by sewing together the side walls of the bag along the line 90, which, while running mainly upright and approximatelyparallel with the front edge of the bag 83, curves forward at its lower end to form a bend in the passage, merging with the neck 82, of the bag 83, while the upper end of the stitching line 90 is spaced from the upper edge of the bag 83, and terminates after turning a short distance, to the rear, Where the passage 89, so formed, mergesV into the top part of the bag chamber 9|, separated from the passage 89, by the stitching line 90.

Before beginning to operate the machine, the sanding drum 34 is removed. The plate 58 is taken off, so that the shaft 54 can be withdrawn through the hole 51, in the housing side 23, thus permitting the sanding drum 34 to drop free of the machine. Having this drum 34 free, the rubber sheet 18 is next wrapped around the cylindrical casing 50 to have its inclined edges meet the edges of the inclined slot 64, in the casing 50. Next,=after wrapping the sanding sheet 65 around the rubber sheet 18, on the casing 50, the sanding sheet ends 92 and 93 are inserted together in the slot 64, of the casing 50, and with the rod 60, so turned, that its flat portion 63 is opposite the rod 66, affording a space, into which the ends 92 and 93, ofthe sheet 65, are passed. The rod 68 is next engaged at its key end 6| by a suitable key, then the rod 66 is turned in a direction to draw in the ends 92 and 93, of the sanding sheet 65, until the same are tightly drawn. During this drawing-in operation, the rod 66, on account of being spring pressed, toward the rod 68, exerts a side pressure against the sanding sheet ends 92 and 93. This pressure also serves to increase the side friction of the rod 60, Within -its end bearings, to hold the rod 60 from turning by itself, and releasing the grip upon the sanding sheet 65. Having thus provided the drum 34 with the desired sanding sheet, the drum is next returned to its proper position in the machine, to have its axis coincide with the hole 51 Land the slot 56, when the shaft 54 is inserted successively through the hole 51, the sprocket wheel-14, the

discs

48 and 41, and their bearings 53, having the tongue 55, of the shaft 54, engage the-slot hole 58, in the housing side 22. The plate 58 is next screwed back in place upon the housing side 23, to keep the shaft 54 from moving endwise within the housing 20. With this sprocket chain 15. properly engaging the sprocket wheels 3l and 14, the motor can turn the drum 34.

Now, having the drum 34, back in place, prepared for the operation, the operator, by means of the nuts 43, 44, on the bolt 42, next adjusts the height of the housing 20 relative to the roller 36, as it stands upon the iloor 94. In Figure 4 such a relatively changed position of the

parts

20, 2l, 23, 36, 42 and 43, from full line positions to the dash and dot line positions, is respectively indicated at 20a, 2|, 23a, 36, 42a, and 43a, assuming for these changed positions that the drum 34 has remained upon the floor 94. It will be noted that for the changed position, just indicated, that relative to the housing side 23, the angle-iron 40 has turned outwardly. Such a position will cause a certain tilt to the sanding drum 34, relative to the oor 94, while an opposite turning adjustment to the angle-iron 40, causing it to turn inwardly with respect to the housing 20, will result in an opposite tilt to the sanding drum 34, thus affording a variety of slight angular adjustments of the sanding drum 34, relative to the floor 94, to govern the sanding operation effect upon the floor.

Referring to the use of the bag 83, the incoming dust and grit passes in the direction of the arrows shown in Figure 1, coming in through the neck 82 and the free passage 89, up and over into the collection chamber 9|, having the zipper 81 closed. The stitching together of the side walls of the bag 83 along the line 90, particularly at its lower end keeps the accumulated dust and dirt, as at 88, from piling up in the lower end of the passage 89, leaving the

passageways

82 and 89 always clear.

The speed at which the drum 34 turns, governs, to a great extent, the rapidity and quality of the work done. I prefer to turn the drum 34 at a high speed, so as to make a relatively short sanding drum do the same work as a longer drum would if it ran slower.

While I have illustrated and described but one embodiment of my invention, various changes and additions can be made without departing from the spirit and scope thereof. I therefore wish to include all forms which come within the purview of the following claims.

I claim:

1. A oor sanding machine including in combination, a housing, a motor on said housing, a sanding drum journaled on said housing, a sanding sheet enveloping said drum, means connecting said motor with said drum to revolve the same, a roller bracket, a supporting roller journaled on said bracket, said bracket being fixed to one side of said housing, to the rear of said drum, a second roller bracket, a second supporting roller journaled on said second roller bracket, said second roller bracket having a longitudinal, upper portion, at an angle to the vertical, approximately horizontal, one end of said longitudinal portion being pivoted on a lower portion of said housing, a depending portion' to said bracket, below said longitudinal portion, and to which said second roller is journaled, at a point positioned below said pivoted end of said longitudinal portion, and off-set from a vertical line passing through the pivotal connection of said bracket with said housing, adjusting means for adjustably fixing that end of said longitudinal portion opposite to the pivoted end thereof with said housing, whereby said second roller lcan be adjusted relative to said housing and to the line of contact of said drum, with said floor.

2. A floor sanding machine made in accord- Iance with claim 1 wherein the said adjusting means comprises, a bolt having one end connected with said second roller bracket and having its opposite end adjustably connected with said housing.

3. In a floor sanding machine having a housing with spaced sides and a sanding drum therebetween, said sanding drum including drum ends upon which is mounted a cylindrical casing, a shaft passing through said drum and having ends concentric to said casing and upon which said drum ends are journaled, a keying and shouldering formation at one end of said shaft, a second formation in one of said housing sides adapted to be releasably engaged by said keying and shouldering formation on said shaft in shouldered relation thereto to hold said shaft from turning, the opposite housing side to that having the keying and shouldering formation having a hole therethrough, into which said shaft enters and through which said shaft is adapted to pass and stop means positioned at the outer end of said hole releasably attached to the housing side having said hole, whereby said shaft is releasably held in said housing against endwise displacement.

ALFRED IOBBI.