US1177363A - Tool for removing boiler-scale. - Google Patents

Description

n. H. SMITH;

TOOL FOR REMOVING BOILER SCALE.

1,177,363. I I Patented Mar. 28,1916.

ATTORNEY UNITED STATES PATENTOFFICE- mm HALEY SMITH, or BANKHEAD, ALBERTA, CAKADAL rooL Foe IiEMovING'Bonne-soALE.

Application filed May 19, 1915. Serial No. 29,207.

Dominion of Canada, have invented, a new and Improved Tool for Removing Boiler,- Scale, of which the following is a full, clear, and exact description. I

My invention relates more particularly to a pneumatic hammer for removing boiler scale, and it is so constructedthatit can be used where it is impossible to work eflectively and conveniently with chisel bars or a hand hammer.

The invention is characterized by a float-' ing chisel positioned in the body of the pneumatic tool in front of the hammer, to be} struck by the latter, the chisel being arranged to recede with the hammer under'the pressure of thetool against the work. The

body of the hammer is intwo parts united bv'a threaded'connectio'n, the front mem-z her being in the form of'a ring that clamps thefcylinder and the cover plate thereof in position and serves to retain the floating chisel against displacement.

The invention will be particularly explained in the specific description following. Reference is had to the accompanying drawings forming part of this specification, in which similar characters of reference indicate corresponding parts in all theviews, and in which: Figure 1 is a longitudinal section on the line '11 of Fig. 3; Fig. 2 is a similar view with the hammer and chisel in different positions in Fig. 1; and Fig. 3 is a cross-section on the line 33 of'Fig. 1. V In constructinga practical embodiment of myinvention in accordance with the illustrated example, thebodv of the tool is in two separate members. the back member 10 forming the cylinder ofthe pneumatic hammer' and being united to the front end 11 thereof by a threaded connection as at 12. At one side of the body is a tubular handle member 13 which in practice will receive a' handle of proper length and shape for the convenient manipulation'of the tool.

\Vithin the body is a cylindrical bushing 14 in which operates a piston presenting upper and lower piston heads 15. 15. A front cover plate 16'is cla'mpedat the front of the cylindrical bushing between the'body sections 10, 11,- said cover plate being en- Specification of Letters Patent.

Patented Mar. 28, 1916.

gaged by an annular internal shoulder 17 l on the front ring section 11 of'the body. Infront of the cover plate *16'is a floating chisel 18 presenting suitable cutting members 19 on its working face, there being an annular flange '20 onthe chisel'outside of the working face, in the rear thereof, which is retained against displacement by an internal annular flange 21 on the body section 11. Y

The cover plate 16 has-a central opening 22 through which the hammer 23 carried by the piston isadapted to be operated to deliver a' blow against the inner face of the chisel 18. The said c'hiselhas a limited reciprocating movement between "the front plate'16 and the flange 21 and is adaptedto be projectedbeyond the body by a blow of the hammer 23 when the front of the body;

and the working face of the tool are pressed against a side of the boiler surface to remove the'scale from the latter., The pressure of the tool against the work will cause the float,- ing chisel-to recede as the hammer recedes and be in a position tore'ceive an effective blowof'the hammer on the forward strike v of the latter. Y

Anyfapproved arrangement of inlet ports and exhaust ports may be provided'in the cylindrical bushing 14, to be controlled by the piston acting as a valve. In the illustrated form an annular chamber 24 between the front and rear piston heads315, l5 'is in communication with the tubular handle 7 member 13, whichis connected in practice with a' compressed air supply or equivalent source of fluid pressure. The bushing 14 is formedwith a lateral port'25 which communicates with'a rearwardly. extending port 26 which in turn communicates with a lateral port 26 leading to the rear side of the back piston head 15.- A second transverse port 27leads from the cylinder and a, for-' wardlv extending port 28 leading from the port 27 communicates with a lateral p'ortd.

28 at the front of the piston head 15. The exhaust from the back of the'pistonhead 15" discharges through a" lateral port 29?,and a forwardly extending exhaust port 29, which extends through the bushing and through the front cover plate 16 to discharge the exhaust through a passage 31 extend ng forwardly from the back of the chisel 18 to the front of the latter, so that the exhaust will serve to blow chipped scalefrom in front of the tool. 'In the present example there ioo is a depressioni tl'ithe front offnthe cover plate l6""t"o which the exhaust passage 29" leads and an annular depression 30 in the opposed rear face 'of-the chisel surface to maintain communication between the exhaust port 29 and the passageportSl in the chisel. The fluid from in front of the piston head 15exhausts through the central opening 22 in the plate 16 when the chisel is in the rearward position and thus through the depressions 30,-..31, and discharges to: and.

througnthe passage 31'.

In assembling. the parts, therchiselwis dropped into the body section 1].. The cover plate-16 is then placed in the=said body, to lie on the annular'shoulder. 1,7 thereof,and

, thepistonand ,cylinder bushing havingbeen placed in position in the bodyseotiomthe two sections are unitedby threaded. connection's;;12.,i The-arrangement permitsof the ready 'dismembering ,of the tool for cleaning, or for. the repairor renewal of particular parts, the construction being particularly advantageous in permitting the ready sharp-- ening of the chisel 18 The/tool is particularly useful inmany situationswhere the: usual chisel bars. and handhammer cannot bei used with convenience or advantage.-

It.is;to.. be observedithat the flange has a beveled: forward surface 20* extending annularly around the'same, and'a reverse bevelQO? rearwardof said front bevel;,also that the flange 21 ofthe=casing section 11 has a bevel 21 mating thebevelQO of the chisel.

self,lwithout binding or jamming, to varying'conditionsin working atdilferent angles.

to the boiler plate.

Having thus describedjmy. invention, what I [claim as newrand desire i to secureby Letters Patent, 11s:

1.. A- fluid: operated tool. comprising a body, a piston insaidbody carrying a hammer, a-cylinder in the body in which the piston. operates, said cylinder having ports for theinlet and exhaust of. a motive fluid,- and' a floatingchisel separatev from and in front of the hammer and. arranged-to have a reciprocating movement in the body and forming a closure of said body. at the front,

said workingtool having a forwardly extending passage therethrough vand in communic'at'ion with. the exhaust ports for the discharge of the exhaust fluidat thefront of the chisel;

floating, chisel inffiontof the cover. plate These-beveled surfaces allow the floating chisel freedom to accommodateits v and hammer, adapted towreceiverblbwsa of,

plate and the front member of the body,'said 7 w coverplatebeing clamped by the said front member of the body, and the chisel being. retained against forward displacement by thesaidafront member.

3. In a fluid operated tool, a body having a tubular handle wherebyto..manipulatezthei; tool: and to conduct;motiveifluitb tlieretopai cylindrical bushingainthe body" engaging: with the. said-tubular= handle; said. bushing? being formed. with: inlet,- and. exhaust: ports-$ a piston operating. in; said bushing andlca rying, a' hammer,21a cover plate. in; front the bushing and havingopeningszcommuin eating with "the exhaust: ports of the. bushing,n. the cover; plate project therethrough,and-, a:floatingg1chisele in. front of the scover 'plate andhammeri adapted to receive the blow-of the latter 'andi provided with a discharge passageffor. thee exhaust.-. s H 1 I 90.1 4 In a" tool ofthecharacter described;,aaI

body provided with means to supply; a-z-mow tive fluid,.a cylindrical,bushingein the body a piston operating in the; bushing and: pro

vided witl .a hammer, inlet portscommunit 95,

eating with. the: fluid supplyandleadingiim opposite directions to :the back-and front of; I

the-piston, an. exhaust port-leading from; the back of the piston forwardly, a cover iplaaten having an exhaust; port.-iin communieat ion'10o' with the exhaust portx fromtthetbaclr.of;the piston and having a central!opening through which the hammer. projeets,,said-. opening: forming. an exhaust .from the-front; of-ith piston when the hammer-.;recedes-,- aneh, 221 x workingtool infront. of the-hammer: v 5. In a fluid operated-toohn; body having; separable front and back members and hay ing acylindertherein formedwvith inlet and;

ing a, hammer, a front'cover plate for-the Y cylinder through; which i thehammer is adapted to project, andigalfioating c-hisel in; front of the-cover plate and ha-lnme-r, said exhaust. ports, .a .pistorrin saidcy-linder ha-yf 3 cover plate and chisel being retained against;

displacement by, the, front membe-nof. the body, thefloating chiselaatftli e: periphery thereofghaving reverse bevels; extending around the .samev and-gthe, front.jmember of thebody presenting a beveled surfacejcor 12o responding with the oppos d-..-b v 1 ofathg saidchiselQ g I p I 6. In aztool,--abody,- a hammer therein;

means to reciprocate. the hammer, and[a; es.

ciprocating loatingJwor-king tool held in .125 i i the bodyseparate from; and in frontofrthe 1 hammer to :be projected:byondtlidbodybyg a blow ofthehammenand.adaptedto h ve a receding movementgunder. pressure. ofrthe work when theliam'mer recedes said. working permittingwthe :1 hammers tog 3 5 tool having a front working face, and being name to this specification in the presence of tiltagle to general plalne to accommodzite two subscribing witnesses. itsel to i erent angu ar positions re a- A tively to the body to dispose its front work- DAVID HALEY SMITH 5 ing face in different planes to conform to the Witnesses: 7 surface of the work. WILLIAM E. SEARLE,

In testimony whereof I have signed my 7 T, WATSON.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. 0.

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