US255115A - Metal-planer - Google Patents

Description

(No Model.)

B. F. RADFORD. METAL PLANER. No. 255,11 5. Patented Mar; 21,1882.

' N4 PETERS. PIwlvLflhngnprher Washington. ac.

UNITED STATES PATENT OFFICE.

BENJAMIN F. RADFORD, OF HYDE PARK, MASSACHUSETTS.

M ETAL-PLANER.

SPECIFICATION forming part of Letters Patent No. 255,115, dated March 21, 1882.

Application filed January 7, 1882. (No model.)

To all whom it may concern:

Beit known that LBENJAMIN F. RADFORD, of Hyde Park, county of Norfolk, and State of Massachusetts, haveinvented an Improvement in Metal-Planers, of which the following description, in connection with the accompany ing drawings, is a specification.

This invention in metal-planers relates to improvements in devices for reciprocating the planer-bed steadily and uniformly without the usual shock and jar'attendant upon the eniployment of toothed gearing and racks. In the most common form of metal-planer a rack connected with the. planer-bed is engaged by a toothed gear, which thus reciprocates the bed; but this is objectionable, as each tooth of the gear as it engages a tooth of the rack strikes, as it were, a blow, causing jar to the parts, and the more the wear and thelooser the fitbetween their teeth the greater the jar. This jar sometimes becomes so great as to be readily noticeable on the metal being planed by thepresence of small transverse ridges. To obviate the employment of toothed gear or wheels for this purpose, which results in shock or jar during the reciprocation of the bed, screws have been employed by some of the prominent manufacturers of metal-planers; but the screws are objectionable for such purpose because of the slow speed at which they operate the planer-bed. To get the greatest speed and entirely dispense with jar attendantupon movin g'the plaher-bedlhave attached smooth metal bands to the ends ofthe planer-bed, and having passed the opposite ends of the said metal bands in opposite directions, partially or wholly about the surface of two drums, 1 have attached the said ends to the said drums. The band secured to the rear end of the planer-bed to drawit backward will preferably be attached tothe bed in a yielding manner through the instrumentality of a spring, so that the shock or strain resultingfrom the quick reversal of the movement of the planer-bed when started backward will not injuriously affeet the planer, and so, also,that when one part of the band partially overlaps another part thereof, because wound more than once about the drum, as when the planer-bed is long, the yielding of the spring will compensate for the increase in diameter of the drum and band. These drums, with which the smooth metallic bands are attach'ed,are secured to a shaft which may haveatone end aworm-toothed gear-wheel, which is engaged and actuated in first one and then in the opposite direction by a worm on a shaft placed parallel with the side ofthe planerbed. The shaft has upon it the reversing-pulleys, which will be operated, all as usual, by open and crossed belts controlled by a beltshifter to enable the shaft to be rotated in one or the other direction, or be left at rest.

Figure 1 represents in top view the frame I of a metal-planer with the planer-bed removed to show the metal bands and the drums with which they are attached,the frame-work ofthe planer above the bed being broken off; Fig.2, a partial side elevation and section of a metalplaner embodying my invention; Figs.3,4, and 5, enlarged details showing the manner ofconnecting one ofthe metal bands with the rear end of the planer-bed; Fig. 6, a vertical section taken through one of the drums.

The frame-work A of the planer is and may be of usual shape,as may be the planer-bed B, and the bed and frame will have the usual guides toinsure the straight movement of the bed with the least friction. The frame-work has suitable bearings to receive the cross-shaft 0, upon which are fixed the two drums at b, which are made as shells, as indicated in Fig. 6. Each drum has its flange or periphery slotted, as shown at 2, to admit the passage of one end of one of the smooth metal bands, 0 or 0,into its interior. Inside each drum, and connected with it by suitable bolts, 3, is a cam-plate, d, to one end of which, by bolts, as at 4, is connected-one of the metal bands, 0 or 0, both drums being alike in the manner of the connection of its metal bands with it. The metal band 0,.connected with drum a, as shown in Fig. 2, is wrapped partially or wholly about the said drum, and connected with the bolt 5, extended through the flanged piece e,secured to the end of the bed B. The drum a, which receives the band thatdraws the planer-bed forward to carry the material against the tool being used, is located directly under the center of the bed B, so that the band draws squarely upon the bed. The band 0 is connected with drum 1), as described of band 0, and wrapped partially or wholly about the drum 1) in the opposite direction from that represented by band 0. It is connected by bolt h and suitable nuts with the rear end of the bed. In practice I prefer to extend this bolt it through a spring,f, thelatter thus occupying a position between the flange ot'part c and thenut 7L2, so that the shock or strain on themachine, when the movement of the planer-bed is to be reversed and moved backward, may be greatly reduced, and so, also, thatthe varying diameter of the drum and band may be compensated for, as previously stated.

The shaft G has at one end of it, as I prefer, a worm toothed gear, Z, which is engaged by worm m on shaft n, the latter being provided with the usual reversing-pulleys to enable it and the worm to be turned in either direction, as it is desired to rotate the shaft 0 in one or the other direction and cause the bands 0 c, secured to the drums a b, to draw the planerbed positively and steadilyin one or the other direction. By the employment of these bands, preferably of sheet-steel, fitted closely to the drums and kept properly strained, the movement of the planer-bed is made most steady and uniform without reducing its speed, and there is no jar whatever, as when the planerbed derives its movement through a toothed gear and a rack or equivalent. The metal bands and drums are cheaper to construct than are other devices heretofore used to move the planer-bed, so far as known to me, are very durable, and will last for an indefinite time without repair of any sort. The employment of the worm and worm-gear also adds to stead- 111688 of movement of the parts.

Instead of the sheet-metal bands to [it the 5 smooth or untoothed drums, wire rope might be employed with good results; but I prefer to employ bands such as shown.

Instead of the particular devices employed for driving shaft 0, I might employ any other well-known equivalent devices.

I claim- 1. In a metal-planer, theplancr-bed and the drums at b, combined with the metal bands connected at one end with and passed about the drums in opposite directions, and secured at their other ends to the planer-bed.

2. The planerbed, the drum a, and the sheet-metal band 0, combined with the bolt and spring to form a yielding connection between the bed and band, substantially as and forthe purpose described.

3. The planer-bed, the sheet-metal bands connected therewith at one end, and the slotted drums at 0, combined with the cam-plates within the said drums, with which the other ends of the said bands are connected, substantially as shown and described.

In testimony whereofI have signed my name to this specification in thepresence oftwo sub- 60 scribing witnesses.

BENJ. F. RADFORD.

Witnesses:

G. W. GREGORY, B. J. NoYEs.

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