US352988A - bridqman - Google Patents

Description

(No Model.) I 2 Sheets-Sheet 1. A. BRIDGMAN & J. OHALLO'NER.

WOOD POLISHING MACHINE.

No. 352,988. Patented Nov. 23, 1886.

(No Model.) I 2 Sheets-Sheet- 2. A. BRIDGMAN 85 J. OHALLONER.

WOOD POLISHING MACHINE.

Patented Novr 23, 1886 In vano 17? I 77 zilnesa as N, PETERS. FhnlwLilhogl-mphu, Washinglcn. u. c.

- 'UNITED STATES PATENT -FF1CE.

ORSlTO THE YATES MANUFAGTURIN G COMPANY, OF BERLIN, WIS.

WOOD-POLISHING MACHINE.

QPBCIFICATION forming part of Letters Patent No. 352,988, dated November 23, 1886.

Application filed November 12, 1885. Serial No. 182,561. (No model.)

To all whom it may concern.-

Be it known that we, ALMON BRIDGMAN, of Berlin, in Green Lake county,'Wisconsin, and J OHN CHALLONER, of OIIII'O, in the county of Winnebago and State of Wisconsin, have invented new and useful Improvements in W'ood-Polishing Machines; and we do hereby declare the following to be a full, clear, and exact description of said invention, reference being had to the accompanying drawings, and to letters or figures 'of reference marked thereon, which form a part of this specification.

Our invention, to be hereinafter distinctly claimed, relates toimprovements in that class of wood-polishing machines adapted to smooth and polish lumber by the contact therewith of the sand-covered surface of a rapidly-rotating.

cylinder; and our invention pertains especially to the construction and means for operating this sand-covered cylinder, which is an improvement upon the cylinder secured to us by Letters Patent of the United States, of Sep tember 25, 1883, No. 285,728.

In the accompanying drawings, Figure 1 is a perspective of the cylinder and the attached mechanism for operating it. Fig. 2 is ahorizontal section of Fig. 1. Fig; 3 is a vertical section of Fig.1. Flg. 4 is acentral crosssection of the cylinder. Figs. 5, 6, and 7are details. Figs. 8' and 9 are perspectives, parts being removed to show other parts more distinctly.

The same letters refer to like parts in all the views.

The driving-shaftA is supported on and rotates in bearings B B on the frame 0. Motion is communicated to the shaft A by a belt from the power-supplying mechanism running upon the pulley D, which is rigid on shaft A. The polishing or sand-paper-covered cylinder is supported on and rotates with the drivingshaft A,and consists oftwo sets of radial arms, centrally pierced by shaft A, each set of arms being in pairs, E E and F F, one set of double arms being at or near each end of the cylinder. These radial arms E E and F F support on their outer ends the segmental sectional plates G G of the cylinder, upon which the several sand surfaces are fixed. Each segmental sectional plate is-attached to the ends (on the same side of the shaft A) of the same set of arms E E or F F, each set of arms carrying two plates, one diametrically opposite the other. 1

Along each of the straight longitudinal edges of the several segmental plates GG is a bar, a, affixed to the armsE E orFF, the outer surface of which bar is a little within the circular contour of the surface of the plates G G, which bar is provided in its outer surface longitudinallywith a groove adapted to receive a strip-like keeper, 7). This keeper [2 is held in position by screws or bolts 0 c, passing through it and through the bar a into an iron retaining-strap,'d, which strap d is supported in mortises in the arms E E or FF and runs just beneath and parallel, with the bar a.

Over the surface of the plates G G is placed the sand-paper covering, lined or cushioned with carpet and sheets'of rubber, which carpet, rubber, and sheets of sand-paper are held in position by their ends being placed beneath thekeeper b b, which are drawn and held down to their seats by the screws or bolts 0 c. Both sets of arms E E and F F are provided with rigid collars e and f, respectively surshaft A. To permit of this reciprocal movement of one set of arms carrying two of the sectional segmental plates, the arms E-Eof this set are located outside of and a little distance from the arms F F of the other set, and the arms E E are each provided with rigid lugs or guides g g, projecting inwardly, which guides g g enter corresponding grooves or recess'es, h h, in the arms F F, which recesses are adapted to receive and permit said guides to slide freely therein, whereby while said arms E E are permitted to reciprocate freely on shaft A they are caused-to rotate with the arms F F, whichare rigid on the shaft. The

object of this reciprocating movement is to .cause'the microscopic lines made by the'sandcylinder on the surface of the material being polished to cross and recross each other, whereby a smoother surface is produced than could otherwise be obtained. To get this reciprocating movement, weprovide a sleeve,

H, encompassing the shaft A at its end opposite the pulley D, in which sleeve the shaft rotates freely, and which sleeve in turn rotates freely in the bearing B. On the outer end of this sleeve H is the fast bandpulley 2', by and through which motion is communicated to the sleeve from the power-supplying mechanism. On the inner end of the sleeve His the collar 3', rigid to the sleeve H, the collar j and pulley i being so adjusted on the sleeve H as not to permit any lateral motion of the sleeve in the bearing B. About the collar j in its periphery there is a continuous inclined or cam groove, 7a. The arms E and F are each provided with an arm, Z, rigid thereto and projecting outwardly therefrom and diametrically opposite to each other, each of which arms carries on its outer end a swiveled button or traveler, m, adapted to enter and travel in the groove k, by means whereof, when the sleeve H revolves somewhat slower or faster than the sand-cylinder, as itis intended to do, the segmental sections of the cylinder are caused to reciprocate laterallyslowly, one set on and the other set with the shaft A.

The segmental sectional plates G G and G G are supported in pairs, each pair being on the outer ends of the same arms, one plate of each pair opposing or balancing the other plate of the same pair,so that an equilibrium, not only of weight, but of centrifugal motion, will be constantly maintained. For this purpose we preferably construct our cylinder in four parts, on two sets of double arms; but the same objects might be attained in substantially the same manner by three or more sets of double arms, with a corresponding number of sections or segmental plates, which would be merely a modification of the form shown in the drawings.

For convenience in constructing and making repairs, the outer arms, E E, are each made in halves and bolted together at the center, as shown in Figs. 1, 3, and 9. The sleeve H is provided with apertures n n, for lubricating the shaft A therethrough.

WVhatwe claim as new, and desire to secure by Letters-Patent, is-

v 1. In a wood-polishing machine, a rotating polishingcylinder formed in longitudinal sections, which sections are connected together in pairs rigidly, the sections in each pair being diametrically opposite each other, and at least one pair of these sections being free to move longitudinally 011 its driving-shaft, and being connected with mechanism whereby a reciprocal lateral motion is given to such sections, all substantially as described.

2. In a wood-polishing machine, a rotating polishing-cylinder formed in longitudinal sections in pairs, each of which pairs has diametrically-opposite sections, in combination with asleeve, H, having a cam-groove, is, rotating on the shaft of the cylinder and making less or more revolutions than the cylinder, said pairs of sections being each connected with and guided by said cam, whereby a lateral alternating reciprocal movement of the pairs of sections is secured, substantially as and for the purpose set forth.

3. In a wood-polishing machine, the radial arms F F, in pairs rigid 011 shaft A, and provided with recesses h h, in combination with the radial arms E E, sliding on shaft A, and

provided with guides g g, substantially as described.

4. In a wood-polishing machine, the cylinder-carrying driving-shaft A, provided with pulley D, in combination with sleeve H, provided with pulley i and collar j, and the col lar j provided with a cam-groove, 7c, whereby a differential motion between said sleeve and said shaft and a reciprocal motion to be given tomechanism connected with said sleeve and rotating on said shaft is provided for, all sub-

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