US781942A - Handle for pneumatic tools. - Google Patents

Description

No. 781,942. PATENTED FEB. 7, 1905. G. H. GILMAN & J. PLAYER.

HANDLE FOR PNEUMATIC TOOLS.

APPLICATION FILED MAY 26, 1904.

2 SHEETS-SHEET l.

4 kQ/ I:

gluueurom N0. 781,942. PATENTED FEB. '7, 1905. G. H. GILMAN & J. PLAYER.

HANDLE FOR PNEUMATIC TOOLS.

APPLICATION FILED MAY 26, 1904.

2 SHEETSSHEET 2.

20 tion on line 2 of Fig. l.

Patented February 7, 1905.

IINTTET) STATES PATENT OEEicE.

GEORGE II. (IILIIAN. OF FRANKLIN, PENNSYLVANIA. AND JOHN PLAYER, OF RIVER FOREST, ILLINOIS.

HANDLE FOR PNEUMATIC TOOLS.

SPECIFICATION forming part of Letters Patent No. 781,942, dated February '7', 1905.

Application filed May 26, 1904. Serial No. 209,964.

Io lication, reference being had therein to the accompanying drawings.

()ur invention relates to an improved handle for pneumatic tools, and will be fully understood by a reference to the accompanying 15 drawings, which form a part of this specilication, and in which-- Figure I shows a longitudinal section of our preferred form of handle attached to a Fig. 2 is a see- Fig. 3 shows a longitudinal section of a modilied form of handle. Fig. & is a section on line a I of Fig. 3. Fig. is a section on line 5 5 of Fig. 3. Fig. 6 is a longitudinal section of another 5 modilied form of our handle. Fig. 7 is an enlarged longitudinal section of the inlet-valve used in the handle shown at Fig. 6. Fig. 8 is a section on line 8 b of Fig. 7.

The object of our invention is to provide a handle for pneumatic implements, and more especially drills and hammers, which embodies an eilicient and durable mlmission-valve for the motive agent, with the operating mechanism for said valve in such position relative to 5 the handle of the drill that it may be manipulated by the same hand which grasps the handle without removing it therefrom.

By an inspection of Figs. l, 3, and 6 it will be readily understood that the admission-duct pneumatic drill or hammer.

40 proper occupies a position either extending around or approximate to the base or that portion of the handle which forms the socket or plug, as the case may be, for the reception of the cylinder and is not located in the handpiece or grip or does not pass through the same as in some forms of handles which have heretofore been devised.

The construction of our handle as shown in Fig. I is substantially as follows: In the socket 1, which receives the cylinder or barrel 2, is formed an annular duct 3, to which a supply of air is admitted through the port I, which port I may be located at any convenient point about the circumference of said socket. An annularduct 5 is also formed about the periphery of the cylinder 2, and from said duct 5 communication is had with the interior of the cylinder by means of the passages ti. A passage T leads from duct 3 to duct 5, and the passage of air through said port 7 is controlled by a valve 8, an enlarged chamber 9 for which is provided in the upper side of the socket l and into which duct 3 leads. Valvechamber 9 is provided with a suitable cap 10, through which passes the valve-stem 11, the outer end of which stem is provided with suitable means to which to connect a lever 12. A fulcrum '13 is provided for said lever which extends rearwardly and is formed into a convenient thumb-piece II, which is located in such proximity to the grip 15 of the handle that the thumb of the operator will easily and naturally rest thereon as he grasps the handle of the drill. The object of extending duct 5 entirely around the drill-cylinder is that by so doing it is not necessary to specially locate the passage 7 circumferentially of said cylinder, as would be necessary in case it were required to register with a single opening.

It will be readily understood that when our drill is in service a constant supply of compressed air is admitted to the port I and maintained in the duct 3 and that when valve 8 is raised by means of the lever 12 the air passes through passage 7 into duct and into the passages 6 to the interior of the cylinder, where its work is accomplished.

In Figs. 3 and 6 are shown modilied forms of our handle, and the principal modification shown in these views over that shown in Fig. 1 is the form of zuhnission-valve, the inlet port and the duct leading therefrom to the valve being similarly located in all the forms here shown. In said Fig. 2) the admissionport is shown at I, and duct 3' leads therefrom to valve 8. As said duct 3 nears the valve 8' it is made long and narrow, and through one side of said valve, which is hollow, as will be seen from an inspection of Fig. 4:, is formed an elongated slot 4:", adapted to register with the approximate end of said duct 4. Said valve 8 is operably seated in a cylinder 16, and to the rear end of said valve is attached a stem 17 which extends through the head of said cylinder, and to said stem is attached a lever by means of which valve 8 is rotated in such manner that slot 4 is carried in or out of register with duct 4. When duct 4 and slot 4: are in register, air passes to the interior of valve 8" and through the open end thereof into duct 5 and from thence through passages 6 to the interior of the cylinder 2. The valve seat or chamber 16 in said cylinder 16 is somewhat longer than the valve 8 and a spiral spring 18 is placed about the stem 17, bearing against the rear wall of said chamber and against the rear end of the valve. Into the upper or rear end of cylinder 16 is affixed a cap or plug 19, having on its outer face the serrations 20, and to stem 17 is rigidly aflixed the disk or washer 21, having thereon corresponding serrations adapted to mesh with those upon cap 19, and upon said disk 20 is formed a sleeve 22, which slips over stem 17 and by means of which said disk is rigidly attached to said stem. To said sleeve 22 is attached the thumb-piece or lever 23, by means of which the valve 8 is operated. The otfice of spring 18 is to hold the serrations yieldablyin mesh, so that the valve may not be too easily operated, said serrations serving also as graduations to indicate the extent of opening of the valve 8. l

The modification shown in Fig. 6 is constructed substantially as follows: The inletport 4 and duct v3 are identical as to location with those in Fig. 3; but at the center of the base or socket 1 is formeda seat which receives the valve mechanism, (shown in an enlarged sectional view in Fig. 7,) which said mechanism consists of a cylinder 24, having a cylindrical valve 25. Slidingly mounted therein about the periphery of said cylinder is formed a channel or clearance 25, to which the duct 3 leads, and through the wall of the cylinder at this point are formed a number of ports 26 for the purpose of admitting air to the interior of said cylinder. The lower interior portion of the valve-cylinder 24: is of a larger bore than the upper portion, so that when the valve 25 is in the position shown in Fig. 7 air has free escape through the valve and about the lower part of the same through the ports 27, which lead to the duct 7 the course of the air being indicated by the arrows in said Fig. 7. When valve 25 is raised to the position shown in Fig. 6, the passage of air through the ports 26 is prevented. To the valve 25 is attached the stem 28, which passes through the cap 29 and through the hand-piece 15 and terminates in the pushbutton 30, by means of which and the rod 31' the valve is operated. Stern 28 passes through the adjustable stop or sleeve 32, which is screw-threaded into the hand-piece, and by turning the same in or out the push-button and the thereto-attached stem and valve are limited in their travel and the amount of the-opening of ports 26 may be thus regulated to any desired amount.

Having thus described our invention, what we claim as new. and desire to secure by Letters Patent, is

In a handle for pneumatic tools, a hand piece or grip, a socket integral therewith, adapted to the attachment of the cylinder of the tool, a valve cylinder at the top of said grip, in longitudinal alinement with said socket, an air-inlet duct in said socket in longitudinal alinement with said grip and leading into said valve-cylinder, a passage leading from said valve-cylinder to the cylinder of the tool, a valve in said valve-cylinder and means of manipulating the same substantially as and for the purpose specified.

In testimony whereof we affix our signatures in the presence of two witnesses.

- GEO. H. GILMAN.

' JOHN PLAYER. l Vitness es S. M. BROWN, E. E. HUGHES.

Images