US634071A - Pneumatic hand-drill. - Google Patents

Description

No. 634,07l.

Patented om. 3, |899.

C. T. SMITH. PNEUIMTIC HAND DRILL.

2 Sheets-Sheet (llo Model.)

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C. T. SMITH.

PNEUMATIC HAND DRILL.

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'PATENT OFFICE.

CHARLES T. s'MiTn, oFoLnvELAND, onto, AssieNoa To THF. UNION nLnoTnIo- COMPANY, or sans PLAGE.

yFV'NELJ'NLATIC HAND-DRILL.

SPECIFICATION forming part of Letters Patent No. 634,071, dated october s, 189s.

Application filed March I6, 1899.

T0 all whom it' may concern:

Be it known that I, CHARLES T. SMITH, a

' citizen of the United States,residin g at Cleve- Improvements in' Pneumatic Hand -Drillsg and I do declare that'the following isa full, clear, and exact description of the invention, which will enable others skilled in the art to which if appertains to make and use the same.

My invention relates to pneumatic handdrills; and the invention consists in the con-i struction substantially as shown and described,-and particularly pointed out in the claims. n

In the accompanying drawings, Figure l is a vertical central sectional elevation of one form of drill embodying my invention. Fig. 2, Sheet 2, is an elevation of the same drill, partly in section and at right angles to Fig. l. Fig. 3 is a perspective viewofa set of connected blades, and Fig. 4 is a cross-section of one of said blades, all being alike in construc- Fig. 5 is an elevation of a modified form of drill, as hereinafter fully described.l

In Figs. l and 2, A represents the body of the drill, formed with a cylindrical motorchamber, containing the motor-Wheel C. The said body is provided )yith a 'number of features essential to the operation of the drill, consisting, 'rst, of a base or pedestal 2, on which it rests When in operation, and oppositely at its top it has a socket 3, in which is fixed a threaded stem B, sleeved upon' the adjusting feed-cone D, having handles CZ to turn the cone. As the drill engages 'in its work thecone is rotated by means of said handles to keep the drill at work.

At opposite sides the body A has handlesockets eand 5, in which are firmly fixed the handles E and F. The handle Ethoroughly closes its socket,l so f that there is no opening therein, While the handle F is tubular and lis itself sleeved upon atube or pipe G, threaded and xed in the socket 5.. A still further feature ofthe body A is its inlet a. at the base of o o eninffs a2 an extension or enlargement bea a K o Serial No. 709,314. (No model.)

ing formed on the body A to provide this outlet in the form shown. f'

Separate heads H and El', Fig. 2, are provided yfor the body A, and the motor-shaft J passes through head H and has a closed bearing in the opposite head H. A pinion K is ynedou the exposed end of shaft J outside .head I-I, and the shaft is engaged to rotate With the motor-cylinder C by the rods c,

which connect the several sets of blades L.

The part C is cylindrical, as shown, but relatively smaller than the chamber in which it- Works, so as to leave a space for the application of themotive iiuid, .which preferably is compressed air, and the said hub is set at one side of the axis of the said chamber to get the desired operation of the 'blades L, as

is now common.

Four several blades L are shown, connected in pairs oppositely, and each blade has its bearingin an open slot or channel extending the full length of the hub. These blades necessarily fit closely at their sides in the. -correspondinglyrflat sides of the slot and are deep enough in the slot when farthest out to givea rm bearingon both sides. Two things necessarily occur with all the blades as they come successively into action-viz.,they carry the full pressure of the motive agent against one side, while they also slide upon the side Walls of the slots forming their bearings. Experience has demonstrated that in this operation of the blades, with metal upon met-al,

Va great deal'of Vfriction is unavoidablaand quality and require but little lubricating to render them serviceable for a practically indenite period and Without injury to the cylinder. ated also preserve a smooth wearing-surface, which is improved by use, and so far as I Blades thus constructed and associknow are an original and novel discovery and invention in this art.

A further feature of novelty is the substantially Y -shaped metallic strip c', set lengthwise in the vedge of each blade and having a substantially V-shaped trough. In this trough I place a separate loose,`- more or less, compact strip N, rounded in cross-section on bottom and side and substantially flat across its top. The flat top bears against the wall of the chamber, making a close packing or bearing strip for the blade, While the rounded bottom affords freedom for rolling or rocking more or less in the V-channel. For this strip I may use fiber, leatheroid, or other suitable material. The extremities of the V stand ont flush with the side of the blade, while the stem thereof supports it in the blade.

.O represents the drill or tool socket, which is threaded onto the lower reduced extremity of the hub of thebowl or crown-shaped gearwheel P in manner to turn therewith. A flange projects laterally from the top of this Wheel, on the faces of which are a series of gear-teeth, which mesh with the pinion K, through which power is communicated thence to the drill. A spindle R is threaded into the pedestal 2 of the body A from below, and the hub 9 of the gear-wheel I) rotates on this lspindle and is supported thereon by a head l0 on the lower end of the spindle engaging the reduced extremity l2 of the hub. The thrust of the tool, ofcourse, is upward, so that in operation the friction will be in the same direction. I have therefore provided for keeping the friction down to the minimum by inserting suitable bearings 13 and 14 in the opposed surfaces of pedestal 2 and hub 9 and inserted antifriction-balls 16 therein.

Having reference now again to handle F and its supporting-tube G, it will be noticed that the tube G is a fixed lnember in socket 5 and that an opening a, in the base of the said socket affords an inlet to the motorchamber. fashioned to form aseat for the valve S, carried by handle F, and a nozzle 17 projects beyond the extremity of the handle F and Valve S to make connection with hose or pipe conducting the motor fluid.

The valve S has a series of openings s, with a free discharge into the annular space between the Valve and the handle F, and the said valve also has an enlarged head portion s' threaded upon by the handle and affording The opposite end of said tube is the annular space referred to, whence the motive fluid passes into the end of tube Gp .interiorly on handle F, and a packing 2O makes a close engagement between handle and tube at their inner ends and affords freedom for adjustment of the handle on the tube without endangering possible leakage at this point. The valve S is controlled lby handle F and is opened more or less, as may be required. As the handle is always in hand during the use of the machine, the valve is thus easily manipulated according to the needs of the machine, and it can be fully operated Without letting` go of the handle, which is a great convenience in a machine of this kind.

I have spoken of the pedestal 2- as being at the bottom of the body A; but this is more especially for purposes of description, as in use the tool will of course be used in any way most convenient.

In Fig. 5 the chuck lO/ for the tool is fixed directly to the motor-shaft Il', and the body 12' has sockets for the handles 13' and 14', as in the other views. A breastplate l5 is employed to bring pressure upon the tool.

What I claim isl. In a power-drill, the drill-body and the handles thereon, and a tube in the inlet-handle having a valved passage for the motive fluid, and a valve connected with said handle to open and close said passage, said handle being threaded on said tube and adjustable, substantially as described.

2. A power-drill and its handles, one of said handles comprising a fixed tube with a valveseat at its outer end, and the handle proper threaded on said tube and a valve connected therewith in position to seat on the end of said tube, substantially as described.

3. In power-drills, the body and the handles thereon, a tube fixed to said body and having the inlet-handle adjustably sleeved thereon and a valve-seat at its outer end, a valve fixed in said inlet-handle to seat on said tube and a nozzle in the extremity of said handleI substantially as described.

Vitness my hand to the foregoing specification, this 20th day of February, 1899.

CHARLES T. SMITH.

lVitnesses:

II. T. FISHER, R. B. MOSER.

IOO

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