US1008812A - Percussive tool for scaling tubes. - Google Patents

Description

F. GILMAN & G. P. GLEMENTS.

PBRGUSSIVB TooL FOR SGALING TUBES.

4 APPL-NATION FILED NOV.12, 1910.

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FRANK GILMAN .AND GEORGE FREDRICK CLEMENTS, 0F SMETHWIC'K, ENGLAND, ASSIGNORS T0 BOILER SCALERS LIMITED, OF BIRMINGHAM, ENGLAND.

PERCUSSIVE TOOL FOR SCALIJSI'Gr TUBES.

Speciication of Letters Patent.

Patented Nov. 14, 1911'.

To all whom it may concern: A

Be it known that we, FRANK GILMAN and GEORGE FREDRICK CLEMENTS, subjects of His Majesty the King of 'Great Britain and Ireland, residing, respectively, at High Park Road, Smethwick, in the county of Stafford, England, and at 82 Trafalgar road, Smethwick aforesaid, engineers, have invented new and useful Improvements in- Percussive Tools for Scaling Tubes, of which the followingV is a specification.

This invention consists of the herein described improvements in percussive tube scaling tools ofthat type which consists'ot a pneumatic or otheriuid pressure hammer adapted to enter the tube to be scaled and having thev fore end of the shank of the hammer piston protruding through the cylinder and made coned or inclined to actflpon a number of internally inclined chisel like or blunt parts which are arranged around brate radially and which receive the rapid vibratory blows of the hammer piston which, acting through said inclines, cause t-he said chisel like parts to chip the scale from the interior of the tube, or cause the said blunt parts to vibrate against the interior of the tube and thus jar the scale ofi"v the outside.

of the same. Percussive tube scaling tools of this type are adapted to be worked with compressed air or with steam or other fluid under pressure and are employed for removing the scale from the interior of the tubes of water tube boilers condensers steam econolnizers and the like, and also by rapid internal blows to remove the scale from the outside of the tubes of fire tube boilers and increased, as when constructed in accordance i with this invention the said tool can be madevery short so as to readily pass around the bends of the water tubes of Stirling boilers and other bent tubes where the radius of the tube is not too small, and moreover the air or other fluid passages in the hammer part y ,'liow from 'the annular space 13 around the are not'liable to become choked and means are provided for propelling the removed scale forward along the tube clear of the working tools and for keeping said tools cool.

In the accompanying drawings illustrating the invention Figure l is a longitudinal elevation of a scaling tool constructed in laccordance with this invention and repre-l sented asin operation removing the scale from the interior of a tube,which is also shown 'in section,I this figure showing the -piston on its back stroke; Fig. 2 shows the =same parts as Fig. 1 with the piston in its `extreme forward postion; Fig. 3 is a cross vsection of the tube on line X X of Fig. 2 with the scaling tool in front elevation; Fig.

4 is a cross sectional elevation of the scaling vtool taken on line Y Y of Fig. 1; Fig. 5 is a cross sectional l elevation of the same tool taken on line Z Z of Fig. 1. A We will describe this invention as arranged to be worked by compressed air, but it will be understood that the same tool can also be worked by other fluid pressure as for inst-ance by steam, or water.

The piston or hammer proper is marked A. The inner casing B has its back end 1 closed and is. fitted and screwed into the open back end 2 of the vouter casing C, said .inner easing B having'an outer flange 3 'which joints against the back end 2 of the outer casing C. The inner. casing B is screw threaded externally for a vshort distance along its outer periphery from the flange 3 and the vouter casing .C is screw threaded internally for a suiicient distance from its :back end 2 to receive the screw threaded part of the inner casing B. The inner casing B has a projecting tapped boss part 5 for the connection of the compressed air. supply tube ,nular passage longitudinal grooves 11,. 12,

which are continuations of the passages 8, 9, lead to the annular space 13 between the in. ner casing B and the outer casing C', so that the air passes along this annular space 13 to the fore end 14e of the inner casing B, which. latter is made somewhat shorter 'than the as to leave sutlicient space at 15 for the kair to end 14 of the inner cylinder and into the "interior of the same. By unscrewing the inner casing B from the outer casing C .the grooves .10, 11, and an' passages 8, 9, can

' passage 21 which extends from the cross port 20 to the back end 422 of the piston. The fore end 23 of the piston shank 16 is conical or inclined asV shown so as to act upon the correspondingly inner inclined faces 24 of vthe series of chisel like or blunt tools y25 which are jointedly connected at 26 by the collar 27 at the front. end of the outer cylinder C and at the outer sides of their front ends they are, as in other percussive scaling toolsvof the same type, made with chisel like parts 28 or otherwise formed to 'chip oil the scale from the interior of the tube.

In order to enable the tools 25 to be readily removed from the cylinder and changed or renewed, said tools are made, with enlarged back ends 30 which engage in an internal annular groove 31 formed in the removable collar 27 which latter is screwed on to the fore-end of the cylinder'at 32.

When the scaling tool is in use the cornvpressed air passes along the passages 8, 9,

and along the annular space 13 and through the space 15 at vthe front end of the inner cylinder B into the interior of the same and also passes through the port 20 of the hammer piston shank and Vthrough the longitudinal port to the back end 22 of the piston thereby driving the` piston and hammer shank forward, say from the `position shown in Fig. 1 to the position shown in Fig. 2, so that the inclined fore-end vof the hammer shank acts upon the internallyinclined parts 24 of the tools 25 driving them outwardly against the scale and chipping oli" portions of the same from the interior of the tube, the air exhausting through the port 20 as soon, as the-latter has passed through the cylinder neck 18. Immediately this happens the air pressure acting on the smaller area of the piston .17 drives the same backwardly until the port 20 enters the cylinder so that the air pressure can then pass through the port and act on the larger area of the piston and drive the same forward for another blow. Thus a very rapid -vibratory movement is imparted to the piston and shank and repeated blows are delivered on the tools 25 to remove the scale in the way well known. The front portion of the hole in the neck 18 of the cylinder is enlarged slightly as shown so as to form an annular exhaustv passage by which the exhaust air is directed along the piston shank to its coned or inclined fore-end 23 and away from the acting tools 25 so as to blow the. scale forward along the'tube.

In order to edectually prevent any damage to the interior of the tube 34: from which the scale is being removed, the said cross ports -20 in the Vpiston shank 16 which regu,-

lates the air inlet to the back of the piston 17 and also the exhaust as aforesaid, are, or may be, so proportioned and arranged that the second or inclined fore-end 23 of the piston shank makes its return stroke immediately it has struck the incline .24 of the chisel like tools 25, so that when the impact of the blow is through the tools delivered on to the innersurface of the scale so as to remove the same, the blow is to a great extent spent before the chisel parts 28 of the tools strike the interior of the tube 34 and thus any damage to the latter is etfectually prevented.

What we claim as our invention, and desire to secure by'Letters Patent is 1. Ina percussive tube scaling tool, the combination of a cylinder composed of .an inner and outer casing and provided with an annular passage between said casings, a boss provided with passages and connected tothecylinder and adapted to be attached to a supply pipe, a neck piece secured to' the v one end of the cylinder, a collar surrounding said neck, a reclprocatmg hollow plston conical at its fore-end, located within said neck' and inner casing and provided with cross ports and acting as a valve, and a plurality of chipping tools having each an end within said collar and arranged around said piston substantially as and for the purpose lherein specified.

2. In a percussive tube scaling tool, the combination of a cylindrical outer casing formed with 'a neck portion, a cylindrical inner casing located concentrically within the outer casing and formed in Aone with a boss to which a supply pipe may be attached, y

said boss being provided` with passages, there being an annular passage between said casings, a reciprocating hollow piston conical at its fore-end located within said neck and inner casing and provided with cross ports and acting as a valve, a plurality. of pivoted and radially movable chipping tools arranged around said piston and a grooved collar screwed on to said neck for retalning said tools in position, substantially as and for the purposeherein set forth. g

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

.- GEORGE FREDRICK CLEMENTS.

Witnesses:

CHARLES BoswoR'rH KETLEY, BERTHA MATILDA DEELEY.

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