US1519829A - Pneumatically-fed tool - Google Patents

Description

G. H. GILMAN PNEUMATICALLY FED TOOL Filed Nov. s. i918 ell. li zam 06.52015 Ga 1 To all lwhom t may concern:

Patented Dee. 16, 1924.

' UNITED STATES PATENT OFFICE.

GEORGE E. Guam, 40F CLABEICNT, -HAIPSHIRE `ASSIGIN'ORv TO SULLIVAN IAOHINEBY COIZPANY, A CORPORATION 0F MASSACHUSETTS.

rNnUmncaLLY-rnn moor..

Application led November 8, 1918. Serial No. 261,686.

Be it known that I, -Gnoncn H. GILMAiT,

a citizen of the United States residing at Claremont, in 'the county of ullivan .and

State of New Hampshire, have invented certain new and useful Improvements in Pneumatically-Fed Tools, ofwhich the following is a full,` clear, and exact, specification.

This invention relates tov pneumatically fed tools, and more particularly to pneumatically fed drills of the type used 1n the front end1\of or ahead of the feedin mining or uarrying' the rincipal object of the preseni invention heling to provide a means for supporting the drilling mechanismon the manner that the apparatus may be used in a limited space, nd that the drilling mechanism is not lia e to change its positionI angularly relative to the feeding mechanism, but will remain parallel thereto.`

In order to obtain a simple and easily controlled apparatus it has been the practice, heretofore, t'o mount the drilling machine on g mechanism and to provide a single member for connecting the machine and mechanism. This construction is not adapted for use in narrow passages or rooms because of its great length, and, because of the single connection commonly used between the drill and the feeding mechanism, it is diicult to ,aline the two accurately so that the drill ically (fed drillinglullnachine, parts of the feeding and dri g mechanisms being shown in section.

'Fig. 2 is a fragmentary sectional view through the rear' end of the drill mounting means showing 'the drill ready for use as a bmi w01.. y In this illustrative embodiment I have eeding mechanism in such av shown a pneumatic'hammer drill comprisin the sleeve of the rotating mechanism and to assist in removin stuck drills. Alarge, ysomewhat tapered sleeve 7 encloses the rotating mechanism and 'is rigidly held against the front cylinder head by suitable clamping means (not necessary to show herein). f

Mounted a back cylinder head 8 is a small water tube 9 which projects centrally through the piston and rotating mechanism into t with suitable passages in the cylinder head, and with a pipe 10, to conduct water to the drill steel, as is common in drilling of this type. A valve (not shown) is usually mounted on the water conductor 10 to oontrol the flow of water to the cutting end of the steel to remove cuttings or chips.

In the form of my improvement shown herein2 I have provided the pneumatic hammer with two spaced su porting members or brackets 11, 12 mounte respectively on the head 8 and sleeve-`7, the brackets in this embodiment being widely spaced so as better e hollow drill'steel, and cooperates machines to provide against a turning movement of p brackets may be mounted on the cylinder in such a manner that the head 8 or the sleeve 7 and the operating parts of the pneumatic f hammer may be `easily removed. Such changes 'will be obvious to those skilled in the art, and it is .the intention to include all such modifications within the scope of the present invention.

The pneumatic feeding device comprises a cylinder 13, a iston 14, .and a piston id 15 having two ongitudinally ,disposed passages 16, 17 which communicate respectively with the front and back of the piston 14 for the purpose of conducting pressurevfluid to one or both ends of this piston or to exhaust the fluid therefrom to move the piston, which in turn moves the pneumatic hammer. For this latter purpose, I have provided the piston rod with a reversed end 18, disposed parallel to and preferably beneath the main part of the piston rod 15. If desired, this rod may be made in sections which may be bolted or threaded' together, but in the present embodiment the piston rod 15 and the supporting member 18 are preferably made of a single piece in order to simplifyand strengthen the construction. l The outer reversed end 18 of the piston rod 14 I preferably term the hammer support, since it is made to pass through the brackets 11, 12 and is held in iiXed relation thereto by a nut 19 and a split ring washer 20. As is shown bythe dotted lines, the end of the hammer support has a tapered fit in the bracket 11, it being apparent that by turning the nut 19 on the threaded bolt 21 formed on the end of the support, the hammer is rigidly secured to said support. Attention is here directed to the fact that the bend 18- in the piston rod which connects the portions 15 4and 18, and the length of the hammer support 18 may be so proportioned to the length of the hammer that the forward end ofthe hammer will not project beyond the bend 18 in vthe piston rod and that the bent end and hammer willw project a minimum distance beyond the -end of the cylinder'l3. By this improved construction the overall length of the apparatus is but slightly greater than the length of 'the cylinder 13 and for use in restricted -mine passages the overall length of the apparatus l may be materially reduced by using -a shorter cylinder. It will also be noted that the front end of the hammer is back of the bendin the piston rod, so that when the drill is fed forward the bent rod will strike a mine wall first and keep the hammer from -contacting with the wall in case aI steel retainer is not used, and even if the latter is used, owing to its construction, but little shock will be imparted to the drill.

Cooperating with my improved Amecha.- nism just described, I have providedva conical valve 22,- herein shown as mounted in the cylinder head 8l, which directs'the flow ofV fluid pressure supplied to the end of this valve by a hose 23, vto the ends of -the cylinder 13 tofoperate the pneumatic feed and to the `cylinder 1 to operate the pneumatic hammer. Since the Vvalve structure forms no part of the present invention, and since one form which this valve mayassumeis fully disclosed in my Patent'No. 1,250,933, issued December 18, 1917, the same has not been disclosed in detail, it being thought lsuflicient for the present disclosureito show the ducts 24 bored in the cylinder head 8 and communicating with the valve 22 and ducts or passages 16, 17 toconduct the fluid leither end of the that they are well known and correspond f generally to the disclosure' of the patent granted me, No. 1,151,261. The rate of feed of the tool can in a well known manner be controlled by this brake.

In order that this apparatus may be attached` to a support, as a bar or tripod,and in order that the pneumatic cylinder may be advanced toward the work as the hole is deepened, a clamping device 25 is provided which maybe clamped to the cylinder` 13 at cumference without changing the position of the drill mounting `as a whole. It will furv ther be noticed that by merely removing the bolt 19 and the split ring 20, it is possible to remove the motor by sliding it rearwardly oit' of the rod 18 and that a motor of different length can be attached thereto in place of the motor removed, asthere is ample room on the lower arm'of the piston rod U to make this possible. I have shown, as will be notedfmytool provided .with a handle 27 which makes it possible to employ the tool as a separate hand tool by plugging off the bores 24 by means of a suitable conical plug .which may be inserted in the socket in the Y rear head on removal of the motor from its' apparatus, a tool, a

mounting therefor comprising a feed cylinder, a piston rod of substantially U-shape with a piston csecured. to one arm of said U and reciprocable in the feed cylinder, and

means for attaching said tool to the other arm' of' said U, said piston rod constituting the sole means by whichV said tool is supported relative to said f eed cylinder.

lll)

2. In a drilling apparatus, a motor, a feed cylinder cooperating therewith, a piston in said feed cylinder, a piston rod secured to said piston and havinga rebent arm, and means formed at the rear end of said re-bent portion for attachment to said motor, said piston rod constituting the sole means by which said tool is supported relative to said feed cylinder.

3. In a drilling apparatus, a motor, a feed cylinder cooperating therewith, a piston in said feed cylinder, apiston rod secured to said piston and having a re-bent. arm, means formed at the rear end of said re-bent portion for attachment to ,said

motor, .and clamping means provided onha said motor kto cooperate with said re-bent portion at a spacially separated point, said plston rod constituting the sole means by 'which saidtoolis supported relative toi said feed cylinder..

4. In a drilling V apparatus, the combination including a. motor, a feeding mechanism for said motorcom'prising a cylinder, a piston reciprocable in said cylinder, a U-shaped piston rod, and means formed on said motor for connecting the same at a plurality of pointsh to the free arm of Said U, said piston rod constituting the sole means by which said tool is supported relative to said feed I cylinder.

5. In a. drilling apparatus, the combination including a tool, a feedin said tool including a feed cylin er, a piston reciprocating therein and a' U-shaped piston rod, one arm of which is secured to said piston and to the other arm of which said tool is attached', said tool being capabley of being swung about the longitudinal' axis of said .first mentioned arm.

6. In a drilling apparatus, a tool comprising a cylinder member, front and back headV members, and a rotation mechanism containing sleeve member, in combination with a feeding device cooperating therewith 'and having a piston rod connected tothe 'rear`head member and to the sleeve membe of the motor. z.

7. In a drilling apparatus, the combin tion including a tool, a f l mechanism for said tool including afee cylinder, a piston reciprocating therein, and a U-shaped piston rodcoo rating with said piston, the free arm of w 'ch may be swung about the longitudinal axis of the other arm, and means for mounting said tool on said free arm whereb the forwardend of sa'id tool is substantia y opposite the bend 'of ,said U. 8. In a drilling a paratus, the combina; tion including a too a device for moving the tool including a feed cylinder and piston, and a U-shaped piston rod cooperating therewith, one end of which is secured to device for said position andthe other end ofwhich provides means, of connection for said tool at a plurality of ints, one of said connections -being a sli able connection, they otherl motor, -and said motor being formed at its front end with means said arm. ,l

10. In an apparatus of the class described, the combination including a cylinder, a iston and iston rod associated therewit a pneumatic hammer, and means connected with said piston rod'and projecting rearwardly from the front end of thecylinder for supporting the hammer, said rod and means constituting 4the sole means by which said tool is supported relative to said feed cylinder.

11. In anapparatus of the class described, the combination including a pneumatic hammer, a sleeve thereon, a su'pport, a bracket rigidly mounted on said hammer for attachment' to and support, and a second bracket rigidly mounted on the sleeve but movably mounted on said support.

12. In an .apparatus of the class described, the combination including feeding the passages in said rod, and a va ve forv controlling the "ilow of pressure Huid through said assages and to said hammer, said hammer Ibein bodily rotatable about the axis of said cy der. v

13. In an. apparatus of the class de scribed, the com ination including feeding mechanism comprising a cylinder, a iustonA and a rod .having a supporting en and liuidpressure assages therein, a pneumatic hammer, a p urali of brackets on said supporting end an one of said brackets communicating with the pa es in said rod, and a valve mounted on sai hammer for controlling the flow of pressure fluid through said assages and to said hammer, said hammer ing bodily rotatable .about the axis of said cylinder.

I aix my signahammer, passages in Certicate of Correction.

It is herebycertified.'thatl in Letters Patent No. 1,519,829, granted December 16, 1924, upon the application of George H. Gilman, of Claremont, New Hampshire,

for an improvement in Pneumatically-Fed Tools, verrors appear in the printed specification requiring correction as follows: Page 3, lines 4 and 5, claim 2, for the words rebent arm read .reversed end; same page, .line 6; claim 2and lines 15. 17;, and 18, claim 3, for the words re-bent portion read reversed emi; same page, lines 13 and 14, c1aim'3, Jfor the words refbent arm read reversed emi; same page; line 64., 4claim 8, for the Word position read piston; andthat the said Letters Patent should. be read with these corrections therein that the same may conform to thev record ofthe case in the Patent Office. Signe@ andsealedfthis 10th day of February, A. D. 1925.

[SEAL] KARL FENNING,

meting Oom/missiomr of Patents.'

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