US1122233A - Portable rubbing and sanding machine. - Google Patents

Description

E. S. SMITH.

PORTABLE RUBBING AND SANDING MACHINE.

APPLICATION FILED JULY 9, 1914.

1 29 233 Patented Dec.22,1914.

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PORTABLE RUBBING AND SANDING MACHINE.

APPLICATION FILED JULY 9, 1914.

1 1 22,330 I Patented Dec. 22, 1914.

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PORTABLE RUBBING AND SANDING MACHINE.

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To all whom it may concern: 7

Be it known that I, EDMUND S. SMITH, a citizen of the United States, residing at the city of Jamestown, in the county of Chautauqua and State of New York, have invented certain new and useful Improve ments in. Portable Rubbing and Sanding Machines, of which the following, taken in connection with the accompanying drawings, is a specification. V

The invention relates to portable machines for rubbing, sand papering or polishing; and the improvement consists in providing a simple, strong and easily handled portable sanding or polishing machine which has a direct drive on the rubbing blocks in giving a reciprocating motion thereto and one which can not easily get out of order; and the invention consists of the novel features and combinations hereinafter set forth and claimed. w

In the drawings, Figure 1 is a perspective view of the sanding machine, a portion of the casing being broken away to show one of the rubbing blocks in position therein. Fig. 2 is a sectional view at line X X in Fig.4, showing the arrangement of the crank wheels and gears, the gears being shown in dotted line; and Fig. 3 is a sectional view' at line Y Y in Fig. 4, showing the arrangement of the gears withthe crank wheels shown in dotted line. Fig. 41 is an end elevation of the rubbing machine, showing the relation of the different parts and their position in the casing. Fig. 5 is a perspective-view of one of the rubbing orsanding blocks with the sliding holder separated the manner of detachably connecting these parts. 6 is a detail of one of the crank: wheels'with the crank arm attached thereto.

' Fig. 7 is a side elevation of the holding spring. for the reciprocating block.

Like numerals of referencerefer to corre-.

sponding parts in the. several views. 1.

for the crank wheels 15 and rubbing blocks 22. Suitable journals are provided for the shafts 16 ofthe gears/13 and 14:, which shafts also support the crank wheels 15 on their lower ends. The two shafts. 16 are placed spaced distances from a central shaft 17 and smallgear 14 which is keyed thereon Specification of Letters Patent.

The numeral 10 designates the casing which is preferably made of cast metal and has the upper compartmentll for the gears 13 and 14 and the lower compartment 12.

Patented Dec. 22, 1914:.

Application filed July 9, 1914. Serial No. 849,958.

the small gear 14 meshing in the larger gears 13 at each side, which larger gears are keyed on the shafts 16, the .three gears being slipped into the end of the compartment 11 of the casing 10 and the shafts l6 and 17 lnserted through them in assembling the parts. The crank wheels 15 first have the crank arms 18 pivotally attached thereto on suitable wrists 19 and then are slipped into the end of the compartment 12 and attached to the lower ends of the shafts 16 s9 that said crank wheels are turned by said shafts.

The horizontal grooves 20 are provided on theopposite inner sides ofthe casing 10 in the. lower portion of the compartment 12 to slidably receive therein the edges of the upper or holder portion 21 of the rubbing block 22. The upper portion 21 of the rubbing block is attached to the lower portion of the block 22 by means of an upward projection 23 which is dovetail shaped and slidably fits within the dovetail shaped opening 24: of the under side of the holder 21. A projection 25 is provided midway of the under side of the holder 21 which fits into a U-shaped bend 26 in a spring 27 attached across the upward projection 23 in a groove 28, which arrangement permits the spring 27 to sink into the groove 28 when the projection 25 enters the bend 26.

The projection 23 holds the rubbing block 22 firmly in line and thespring 27 on the projection 25 interlocks the parts so that they can not get out of position in their relation to one another. It is apparent that different forms of rubbing blocks 22 may' -.'protected from dust and dirt by means of sheet metal plates 31 which are attached to the lower edges of the casing 10 at each side an'd the holder 21 is cut away so as to leave only a central lengthwise narrow neck or standard 33' in order to lighten the same. The plates 31 extend. close to each side of the standard 33 leaving a single narrow slot 34' central of the machine, thereby protecting the mechanism against sand grit or other forms of dust and dirt. The holder 21 is attached to the crank arm 18 by means of a suitable wrist 32, and the rubbing blocks 22 with their holders are so proportioned that a pair of blocks maybe attached one to each .of the shafts 16 to be reciprocally moved by said shafts and the crank wheels so as to cover the space without interfering 2 thereby turning gears 14 and 13 and shafts 16 with crank wheels 15 thereon, thereby reciprocating the rubbing blocks by means of crank arms 18. This forms an exceedingly simple and direct drive which distributes the wear to the two crank shafts 16 and is not'liable to get out of order and yet is exceedingly powerful, accomplishing the work with the minimum of time and power.

I claim as new:

1. In a rubbing and sanding machine, a casing having upper and lower compartments therein, three vertical and parallel shafts mounted in spaced double journals in said casing and extending into said compartments, the central of said .three shafts extending above said casing to form a drive shaft-for the other two shafts, spur gear connection between the upper ends of said other two shafts and said central driving shaft, crank wheels on the lower ends of said other two shafts, crank arms on suitable Wrists on said crank wheels, rubbing and sanding blocks slidably mounted in suitable ways in said casing one to each end, said blocks connected to said crank arms by suitable Wriststo thereby move said blocks to and from one another when said crank wheels are rotated by said shafts. I

2. A machine of the class described comprising a casing having upper and lower compartments, a vertical driving shaft journaled in said casing and extending centrally into said compartments, a gear on said driving shaft in said upper compartment, vertical crank shafts journaled one each side of said driving shaft in said casing andextending into said upper and lower com-- partments, gears on the upper ends of said crank shafts in said upper compartment meshing in the gear on'said driving shaft, crank wheels on the lower ends of said crank shafts in said lower compartment, said lower compartment having sliding ways on the opposite inner sides thereof, a pair of rubbing or sanding blocks slidably mounted in said sliding ways, a direct crank arm connection between said crank wheels and said blocks to reciprocally move said blocks to and from one another on said sliding ways, and means for protecting the mechanism from the dust and dirt.

3. In a rubbing and sanding machine, a casing having sliding ways on the opposite inner sides of the lower portion thereof, a rubbing or sanding block slidably mounted in said sliding ways and consisting of an upper portion having a dovetail-shaped opening crosswise of its under side and a downward projection on said under side within said dovetail-shaped opening, a lower portion to said rubbing block having a dovetail-shaped upward projection on its upper side to fit within said dovetail-shaped opening on the under side of said upper portion, a spring on said dovetail-shaped upward projection of said lower portion, and a crosswise bend in said spring to engage said downward projection on said upper portion within said dovetail-shaped opening to thereby unite said upper and lower portions and hold said lower portion firmly in line.

4. In a rubbing and sanding machine, a movable casing having sliding ways on the opposite inner sides of its lower portion, a pair of rubbing or sanding blocks mounted in said sliding ways one to each end of said casing, mecha'hism in said casing for reciprocally moving said blocks to and from one another on said sliding ways, said blocks having lengthwise openings on the opposite sides thereof extending nearly to the center of the casing to form a narrow neck or standard connecting the upper and lower portions of said blocks, and guard plates attached to the lengthwise lower edges of said casing and extending into said lengthwise openings to said narrow neck on each side thereof to protect said mechanism from dust and grit. 1

In testimonywhereof I have aflixed my signature in the presence of two witnesses.

'EDMUND S. SMITH.

Witnesses:

H. A. SANDBERG, CLAYTON M.- JoNEs.

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