US971114A - Sandpapering-machine. - Google Patents

Description

L. H. BRECKENKAMP.

SANDPAPERING MACHINE. APPLICATION FILED DEG. so, 1909.

971, 1 1 Patented Sept. 27, 1910.

2 SHEETBSHEET l.

L. H. BREGKENKAMP. SANDPAPERING MACHINE. APPLICATION FILED DEO.30,1909.

9? L, 1 1 4, Patented Sept. 27, 1910.

2 SHEETSSHEBT 2,

WTTED %TAT% PATENT OFF.

LOUIS H. BRECKENKAMP, OF ST. LOUIS, MISSOURI, ASSIGNOR F ONE-HALF TO JOSEPH C. MILLER, OF ST. LOUIS, MISSOURI.

SANDIPAPERING-MAOI-IINE.

Specification of Letters Patent. Patented Sept, 27, 1910.

Application filed December 30, 1909. Serial No. 535,690.

To all whom it may concern:

Be it known that I, LOUIS H. BRECKEN- Kiirir, a citizen of the United States, and resident of St. Louis, Missouri, have invented certain new and useful Improvements in Sandpapering-ht[achines, of which the following is a specification.

This invention relates to improvements in sandpapering machines, and has for its objcct to provide endless abrasive belts rotatably mounted above a table and a carriage on which the material to be sandpapered is mounted and brought in contact with the belt in observation of the operator.

A further object of my invention is to construct a machine having a plurality of endless abrasive belts located above a table with which the article to be worked is brought in contact in the view of the operator.

In the drawings Figure 1 is a side elevation of my complete invention. Fig. 2 is a front view of the same. Fig. 3 is a detail perspective View of a portion of one of the sides of the supporting frame and the idle roller carried thereon. Fig. 4 is an enlarged detail sectional view of one of the sanding pulleys made use of in carrying out my invent-ion. Fig. 5 is a perspective View of the carriage used for supporting the article to be worked. Fig. 6 is a detail perspective view of the lower end of one of the guy rods for supporting the frame.

Referring to the drawings in detail, 7 indicates a pair of telescopic columns provided with pedestals 8 by which the same are securely supported to the floor, the inner tubes 9 of the columns 7 are also provided with capitals 10 by which the same are supported to the ceiling 11, the purpose of the telescopic columns is to accommodate various heights of ceilings to which my machine is-to be installed.

On the outer tube of the columns 7 are formed projecting trunnions 12 on which is pivotally supported the supporting frame 13 which consists of a pair of side bars 14 connected together near the front by the cross bar 15, the front ends of the side bars being bent downwardly and provided with the journal boxes 16 in which is supported a shaft 17, the same being held from lateral motion by the collars 18.

On the ends of the shaft 17 is mounted a pulley 19 which is constructed of a pulley block 20 having a central shaft boxing 21 and a rounded periphery Over this is placed a covering 23 of resilient material such as canvas, or the like, and the ends 24 attached to the sides of the pulley block 20. Between the cover 23 and the block is placed a quantity of filling material 25 to provide suitable resiliency so as to permit the covering to conform with the irregular curvatures of the work to be sanded. Over these pulleys are passed endless abrasive belts 26 such as are commonly known in the trade as sand or emery belts, said belts being operated by pulleys 27 mounted upon a line shaft 28 driven by the pulley 29 and drivebelt 30. This shaft 28 is suspended in hang ers 31 of the usual type and at a suitable distance to the rear of the columns.

On the side bars 14 of the supporting frame is formed perforated lugs 32 in each of which are located short shafts 33 on the outer ends of which is supported an arm 34 carrying an idler 35 which contacts with the abrasive belt, keeping the same in taut position. On the opposite or inner end of the short shafts is mounted an adjustable counterbalancing weight 36 and arranged to regulate the pressure of the idler onthe belt.

In order to support the frame 13 in a rigid set position above the table 37, I provide two guy rods 38 each provided with turn buckles 39 for adjustment, and extended upwardly in crossed manner and rigidly attached to the timbers of the upper floor, the lower ends of said rods flattened as shown in Fig. 6, provided with an elongated slot 40 through which a bolt is inserted, and by said bolt the flattened ends are adjustably held against the side bars 14. For an additional safe-guard in supporting the frame in an elevated position, I provide the rod and chain connection 41.

On the table 37 which is supported on suitable standards, I operate a carriage 42 consisting of a body 43 having handles 44 held by the operator. The opposite end of said body has a cross-bar 45 to which is pivoted a caster-supported frame 46. On the carriage is placed the article to be worked and is brought up against the abrasive belt under the pulleys 19 (see Fig. 1), and in this manner the operator can carefully observe the progress of and manner in which the article is being sanded.

This construction of machine is adapted for sanding articles having irregular or curved surfaces, such as hollow chair bottoms and the like.

The essential feature of my invention is the applicability of endless abrasive belts operating over resilient pulleys against which the material to be sanded is brought in contact face up, so that the progress of sanding can be closely observed by the operator.

Having thus fully described my invention, what I claim as new and desire to have secured to me by the grant of Letters Patent, is:

1. A sanding machine comprising a pair of vertical adjustable columns, a table secured to said columns, a frame pivotally mounted to each of said columns, a shaft supported on the free end of said frame, a pair of resilient pulleys supported on the projecting ends of said shaft, driving pulleys, and endless abrasive belts operating over the resilient pulleys in combination with a carriage operating on the table and on which the material to be sanded is supported and brought in contact with the tftbliftSlVe belt face up, substantially as speciiec.

2. A sanding machine comprising a pair of vertical columns, each column adjustably mounted so as to be supported to the floor 1 and ceiling at various heights, 21 table connected to the columns, a frame pivotally connected to each of said columns, a shaft revolubly mounted on the free end of the frame, a resilient pulley mounted on each projecting end of the shaft, driving pulleys mounted in hangers and supported to the ceiling, an endless abrasive belt operating over the driving pulleys and resilient pulleys, idlers mounted on the frame and contacting with the abrasive belts for keeping the same in taut position in combination with a carriage supporting the material to be sanded mounted upon the table and brought in contact with the abrasive belts, substantially as specified.

In testimony whereof, I have signed my name to this specification, in presence of two subscribing witnesses.

ALFRED A. EICKS, lVAL'rnR O. STEIN.

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