US323053A

US323053A - Pneumatic tool

Info

Publication number: US323053A
Authority: US
Publication date: 1885-07-28
Anticipated expiration: 1902-07-28

Description

(No Model.)'

' J. S. MoGOY.

PNEUMATIC TOOL.

No. 323,053. Patented July 28, 1885.

WITNESSES INYENTOR AW W g% y- 7% ATTORNEYS.

N. PETERSv Phololiihugnphm Wnhinginn, D. C.

JAMES S. MCCOY, OF, BROOKLYN, NE\V YORK.-

PNEUMATIC TOOL.

LJPECIFICATION forming part of Letters Patent No. 323,053, dated July 28, 1885.

Application filed September 1, 1884. (Yo modem To all whom it may concern:

Be it known that I, JAMES S. McCor, of Brooklyn, in the county of Kings and State of New York, haveinvented anew and Improved Pneumatic Tool, which invention is fully set forth in the following specification.

This invention consists of a new and improved pneumatic tool for working in stone and for other purposes, wherein a current of air or steam forced intothe tool causes a piston or striker to deliver rapid blows upon a rod or bar to the outer end of which the cutting-point is attached, all as hereinafter fully described, and pointed out in the claim.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a longitudinal sectional elevation of my new and improved pneumatic tool. Fig. 2 is a front elevation of the piston-chamber, with the outer shell removed to show the air-passages. Fig. 3 is a front elevation of the opposite side of the piston-chamber, and Fig. 4 shows the valve removed.

The section A of the main casing of the tool is formed with the air-inlet passage 0, eX- haust-passage a, and with the piston-chamber b, in which the piston or striker D tits. The lower section, B, of the main casing is screwed to the section A, as shown, and is formed with the countersink c, to receive the flat head or plate (Z of the tool-carrying rod or spindle O, placed in the section B. The part a of the section A, which incloses the pistonehambr b, is surrounded by the shell I), and this part a has three slots or ports, 7t- Z m, and also the four passages or ports a a and 0 0, Fig. 1, made through it, and upon its outer surface the said part a is faced off on opposite sides, as shown at p q, Figs. 2 and 3, and is grooved or recessed, as shown at r, s, t, and a.

The piston or striker D is made to fit exactly in the chamber 2), so as to control the passages and slots above mentioned made in the part a of section A, and is provided with the transversely-arranged valve 6, and is formed with the transverse air-passages h and t, which coincide with the slots k Z, with the transverse passage j, (shown in dotted lines in Fig. 1,) which coincides with the slot at, and with the vertical air-passages f g, (also shown in dotted lines in Fig. 1,) leading, respectively, to the top and bottom of the piston or striker from the chamber in which the valve 6 is placed.

The valvecis formed with the groovese' 6, arranged so that the valve in its reciprocating movement, causedby the pressure of air entering the ports a and 0, alternately opens and closes all the air passages through the piston or striker D.

In operation air, being admitted through the induction -passage a into the passage 1), (the striker being in the upper positi0n,) passes through passage 1. and port a, moving valve 6 to close passage t and to connect passages m, j, and f, whereby air is admitted above the striker D, and at the same time the passages h, k, and are connected to allow exhaust from below striker D through passages q and n. Then the air through passage a and port 0 moves valve 6 to close passage 71, to connect passages 1a, and g, to admit air below the striker, and to connect passages f, 13, and Z, to open the exhaust from above the striker, and so on alternately, thus causingthe striker to have a rapid reciprocating movement, causing it to deliver rapid blows upon the plate d of the tool-carrying rod 0, which forces the rod 0 suddenly down in the tube B against the pressure of the spring-h, which, after each blow of the striker, returns the rod 0 to its original position.

The stroke of the piston or striker D upon the plate (1 acts to force the rod 0 down,partly by impact of the striker against the plate (Z and partly by concussion of the air against said plate; hence the effectiveness of the tool is increased by the increased surface obtained by the plate (I, and by employing this plate (Z and the countersink c the upward movement of the rod 0 and plate, caused by the reaction of the spring h, produces a partial vacuum below the plate cl, so that there is very little resistance of air to the downward movement of the plate (I.

' The tool thus constructed is adapted for drilling rock, dressing and carving marble and other stone, calking boats, chasing brass cushion the piston or striker and valve at IO and silver and other metal, and for various every point with air so perfectly as to secure other uses. the minimum amount of wear in the Working Having thus described my invention, I claim parts of the tool. 5 as new and desire to secure by Letters Patent The combination of induction and eduction JAMES MCCOY ports in the piston-chamber b, and striker D, Vitnesscs: controlled by the valve 6 within the striker D, H. A. VVES'I, and the plate (1 of the tool-bearing rod to J O. SEDGWIOK.