US1069289A - Fluid-pressure-operated tool. - Google Patents

Description

Patented Aug. 5, 1913.

SHEETS-SHEET l.

W. PRELLWITZ.

v FLUID PRESSURE OPERATED TOOL.

APFLIUATION FILED APR. B, 1909. 1,069,289.

. tions PATENT onirica.

WILLIAM PRELLWITZ, 0F EASTON, PENNSYLVANIA, ASSIGNOR T0 .lNGERSOLL-RAND COMPANY, or New YORK, N. Y.,

A CORPORATION 0F NEW JERSEY.

FLUID-PRESSURE-OPERATED TOOL.

' Specification of Letters Patent.

Patented Aug. 5,1913.

Application led April 8., 1909. Serial No. `488,720.

To all whom t may concern Be it yknown that I, VILLIAMI'PRELLWITZ, a citizen of the United States, and resident of Easton, in the county of Northampton und State of Pennsylvania, have invented a new and useful Improvement in Fluid-Pressure-OperatedTools, of which the following is a specification.

My invention relates to fluid pressure operated tools, such as hammer drills, having a Huid pressure operated feeding device, and' has for its ob'ect to provide certain improvements in t e construction, form and arrangement of the several parts thereof, whereby means are provided for regulating or governing the amount of fluid pressure in the feeding device'so that the degree of power exerted by the tool feeding device 'may' be adjusted for different inclinations of the tool; and in which the tool feeding d'evice is located along the side of the tool thereby making the tool much shorter and' more compact than heretofore.

A practical embodiment of this invention is shown in connection with a pneumatic hammer drill having a water feed attachment and an automatic rotation for the drill steel, and a pneumatic feed for the drill.

, Figure l represents in top'plan so muchv of a. pneumatic hammer drill as will give a clear understanding of my invention,` F 2 is a longitudinal central section throug the same in the plane of the line A-A of Fig. 1, Fig. 2a isa det-ail` section through.

the automatic rotation device.' Fi 3 is a detailsection taken in the plane o the, linev B-B 'of Fig. 2, Fig. if-isa transverse sec# tion taken in the planef oflfthefline C-C of Fig. 2, Fig. is an outerend view of the drill, the drill steel being shown in sectioxi,,v

Fig. 6 is a detail longitudinal section taken in the plane of the line Dl of Fig.- 4, Figs.,

7, 8 and 9 are enlarged-detail-eross sections taken in the plane .of the line .Enf Fig. 3, showing 'one of the manually operated com trolling valves in three of its operative posiand Figs. 10, 11 and 12 are enlarged detail lcross sections through said manually 'operated controlling valve taken in the plane of the line F of Fig. 3, showing the\valve in its three positions corresponding to Figs. 7, 8 and 9.

The hammer drill cylinder is denotedv by l and its reciprocating piston by 2. The

.5.5 chuck for the hollow drill steel 3 comprises an inner member 4 and an outer member 5 both mounted within the cylinder 1. An anvil block6 is located ,Within the chuck of the piston 2, as follows :-A .l nut 8 is screwed into the inner endv of the inner member 4 of the chuck, which nut has a. spirally iiuted bore .for engaging the spirally iuted hammer extension 7 of the piston 2. This extension 7 slides freely through a ring 9, which forms the front head of the piston chamber 410. The rear end of the piston 2 is provided with an axial bore 11 into which is screwed a nut 12 having a straight fiuted bore arranged to engagea .straight'fluted bar 13`which projects f orwardly from the inner member 1410i a rotating mechanism, the outer -member )of .which is denoted by 15 and between which members is the usual pawl and ratchet connection.

A device for feeding fluid under pressure, as, fol-*instance water, tothe hollow drill inder l, which device 'is separate from the device for supplying the motiveluid to the tool and may be constructed as follows z-A Awater supply pipe 16 is in open communication through the sidewall of the cylinder 1 with an annularwater supply chamber 17 surrounding the outer member 5 of the chuck," which chamberis formed by provid- `-in`g a rin member v5.of the chuck. Washers l19 and 20 form water tight packings for the chamber l`between` the ringl8 -and the chuckmember A lduct`21 leads from the annular chamber 17 to the space 22 around the' inner end of the hollow drill steel 3. Thabore 23 of the v hollow drill steel is at -all times in open the armsi, 2

fitfinstance by Irovidi'n oft the shell7 n,Witl'n angle communication with the space 22 and to be inovedalongfits supporting shell 25 it, ..1

Y( Y oars 28,29, fitted 110 at threar end of the drill steel 3 inposition An. automatic step by step rotation impartedlto the drill steel by the reciprocation steel is provided at the front end of the cyl- 18v located within the outer `end of the cylinder 1' and spaced from the outer' lo portions of the cylinder l in which reentrant angles are formed. rThis shell 25 may have a cone 30 for pivoting the tool to any suitable support.

The device for feeding the tool forward to its work is constructed and arranged as follows: The feed cylinder 31 is located at the side of and in juxtaposition to the tool cylinder l and the hollow rod 32 of the feed piston has' its forward end secured to an oli'- set portion 33 at the outer end of the cylinder Al. The rear head of the cylinder 31 is denoted by 34 and the front head thereof, which forms. a dust and dirt excluding cap, by A cross pin 36 passes through the supporting shell 25 and the front head 35 of the cylinder 31 for holding the cylinder against longitudinal movement with respect to the supporting shell.

One means for regulating or governing the amount of iiuid pressure in the feed cylinder according to the position or inclination of the hole being drilled, may be constructed, arranged and opcrated'as follows The head .37 of the feed piston is provided with a hole 38 formed lengthwise therethrough so as to provide a fixed leak of a predetermined amount from the power side of the piston head to the other side thereof. The space in front ofthe piston head 37 is open to external atmosphere as, for instance, throughia hole 39 in the cylinder front head or cap 35 so that the fluid which leaks through the hole 38 in, the piston head escapes from the space in front of the head to external atmosphere. A manually operated valve is arranged in the offset portion 33 at the outer end of the cylinder l in position to control the amount of fluid pressure fed to the rear or power side of the piston head 37 through the hollow piston rod `32.l This valve is herein shown as of the rotary plug type, the body of the valve being denoted by 40, its stem by 41 andv its handle by 42. The valve body 40 is provided with an axial port 43, open to the interior of the hollow piston rod 32 and with a plurality oftransverse ports, in the present instance four ports 44, 45, 46, 47, of gradually increasing area, any .desired one of which is arranged to be brought into y open communication with ,the passage 48 through which the pressure fluid is fed to the tool feeding device. This manually.

operated valve is yieldingly held in its different rotary positions as, for instance, 'by providing the periphery of the handle 42 with a series of recesses 49, 50, 51, 52, corresponding to the transverse ports 44, 45, 46, 47, any one of which recesses is arranged to be engaged by a spring pressed ball 53. A spring 54 surrounding the valve stem 41 serves to hold the body 40 of the valve in its seat.

The cylinder valve chest is denoted by 55,

arranged to open and close the admission of theA pressure fluid to the tool through the inlet port 57 and to open and close communicationto the tool feeding device controlling valve as follows z-The tapered body of the valve is denoted by 6l and it is held in its seat by a coil spring 62. The smaller end of this valve is provided with al handle 63. The body 61 of this valve is provided with an axial port 64 in open conimunication with the fluid supply pipe 65. This axial port 64 is provided in one transverse plane with a transverse port 66 for opening and closing communication to the inlet port 57 and it is provided in anotler transverse plane with a transverse p ort 67 l ated fluid supply controlling valve is 1n the position shown in Figs. 7 and 10, the

pressure fluid is open to the tool feeding device but closed to the tool. When the valve is in the position shown in Figs. 8 and 1l,

the" Huid supply isstill open to the tool feeding device and is also open to the tool for permitting the .operation .of the same.

When the valve is in the position shown inA Figs. 9 and 12, the fluid supply'is cut olii' from both the tool feeding device and the tool; the tool feeding device at the same time being open to external atmosphere.

The reason for the fixed leak through the tool feeding piston and for the varying sizes of ports in the tool feeding device, is as follows z-When the tool is being used with its steel pointed downwardly in a substantially vertical position, only sufhcient pressure is needed in the feed cylinder for working 'the' tool in that position. Therefore, when the parts are in this position, the

smallest port in" the tool 'feeding device con- Y seen that a suicient amount of the pressure fluid must be fed to the feeding device to overcome the weight of the tool cylinder and its parts. This may be accomplished by turning the tool feeding device controlling valve into a position to open its largest port to the back or" the tool feeding piston. The right amount of l'iuid to he fed for feeding the tool steel to its Work in diierent angular positions between the downward vertical and upv/ard vertical limits, can be taken care of with the intermediate sizes of ports in the tool feeding device controlling valve.

it will be seen that not only is the` tool made much more compact by mounting the feeding device therefor along the side of the tool cylinder but also novel means are provided for regulating the amount of the pressure in the tool feeding cylinder according to the angular position of the tool with respeet to its support.

While I have shown one means for regulating or'governin' the pressure in the feeding cylinder accor ing to the conditions required, it is evident that other means might be employed for accomplishing the same result; hence l do notl Wish to limit myself to the Ineens herein shown and described, lout 1. A uid pressure operated tool, a duid pressure operated tool feeding device having a iiXed leal; and means for controlling the amount 'of pressure fluid `edV to the feeding device.

.2. la fuid' pressure operated tool, a duid pressnre'operated tool feeding device having a fixed leak, means adaptedto admit pressure duid to the tool and there maintain. the supply and means for varying the amount of pressure fluid-fed to the feeding device.

l 3. A inid pressure operated. tool, a duid pressure operated tool feeding device, a manually operated valve for controlling the supply of pressure fluid to the feeding device, a second manually operated valve for controlling the supply of pressure fluid coth to Athe tool and to the first-named valve, said feeding device having a xed leak.

A fluid pressure operated tool, a Suid' pressure opel eed :feeding device ther-eier having a lixed leal: and a manually operated valve having ports of dierent sizes ttor controlling the ernennt of pressure iinid ed to the feeding device.

ln testimony, that i claim the foregoing as my invention, l', have signed my name in presence of two Witnesses, this seventh of Aapril i969.,

NLJM FRELLWTZ.

VWitnesses z F. Geenen BARRY, HENRY Copies o this patent may be obtsuef fer: five cents each, "oy aressing the C emssener of Patents,

Washington, v3.

Images