US3343246A

US3343246A - Scaling tool

Info

Publication number: US3343246A
Application number: US505771A
Authority: US
Inventors: Thomas M Kelley; Walter I Anderson
Original assignee: Individual
Current assignee: Individual
Priority date: 1965-10-29
Filing date: 1965-10-29
Publication date: 1967-09-26
Anticipated expiration: 1984-09-26

Description

Sept. 26, 1 T. M. KELLEY ETAL SCALING TOOL Filed Oct. 29, 1965 0 4 0 1 4 00000080 Q O O O 0 0 0 0 0 0 0 0 0 0 0 0 0 h 0 0 0 0 0 0 0 0 0 0 00 0 0 0000 0 0 0%00N M 0 0 0 0000000 ww- N2 INVENTORS Om mm THOMAS M. KELLEY- BY WALTER ANDERSON DD e Q I 0 v w 00000000 0 -v w3+ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Q 0 0u0 0 00 0 0 0 0 0 0N0".u0000u% u n u n n u w u 0 0 0 0 0 0 0 0 0 0 0 0 %%0& u r 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 Nv wv mm mm vv Om mm ON P wN Tm mm h 3 mm ATTYS.

United States Patent 3,343,246 SCALING TOOL Thomas M. Kelley, 7403 Park Terrace, Alexandria, Va. 22310, and Walter I. Anderson, 41 Briarwood Lane, Chesapeake, Va. 23703 Filed Oct. 29, 1965, Ser. No. 505,771 3 Claims. (Cl. 29-81) ABSTRACT OF THE DISCLOSURE A scaling tool driven by a rotating electric motor having a cam drive arrangement which converts rotary to reciprocating motion driving a needle scaling head together with a bundle of needles therein which are therefore impelled into contact with a surface to be scaled and cleaned.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

This invention relates to needle scaling tools and more particularly to an extremely slim and compact electricallydriven needle scaling tool.

One object of the invention is to provide an electricallydriven needle scaling tool having a slim silhouette or low diameter to length ratio.

Another object of the invention is to provide acompact and light weight electrically-driven needle scaling tool.

Another object of the invention is to provide a new and improved cam driving arrangement for an electrically-driven needle scaling tool.

The needle scaling tool contemplated by the present invention is basically comprised of an electric motor, a reciprocating plunger, a cam drive for converting the rotational output of the motor into the reciprocatory movement of the plunger and a needle scaling head with a bundle of needles therein which are adapted to be impelled by the reciprocating plunger into contact with a surface to be scaled or cleaned. The cam drive is carried within a housing which is attached to and axially aligned with the housing of the motor and includes a bearing-supported barrel member which is rotatably connected to the output shaft of the motor and axially aligned therewith. The barrel member carries a cam pin which rides within a continuous cam groove in the reciprocating plunger which in turn is slidably received within an axially extending bore within the barrel member. A needle scaling head including a needle housing with a spring-biased needle retainer and a cluster of needles therein is detachably connected to the cam drive housing and is adapted to receive one end of the reciprocating plunger. The needle housing carries a detachable guide sleeve for the needles and the sleeve is axially adjustable relative to the housing; the sleeve providing a means for holding the free ends of the needles in a bundle-like assembly.

As the barrel member is rotatably driven by the motor, the cam pin riding Within the cam groove imparts reciprocatory movement to the plunger and, for each revolution of the barrel member, drives the plunger through one complete stroke axially inwardly and outwardly of the barrel member. As the plunger is moved outwardly on its power stroke, it strikes the needles and impels them outwardly of the needle housing into contact with a surface to be scaled. When the plunger is driven inwardly by the cam drive on the return half of its stroke, the spring-biased needle retainer urges the needles inwardly of the needle housing into a position where they will again be struck by the plunger as it moves on its power stroke outwardly of the barrel member.

The aforementioned and other objects of the invention will become readily apparent from the following detailed description of one specific embodiment thereof when taken in connection with the accompanying drawing, wherein like components are designed by like reference numerals and wherein the sole figure thereof is a partial longitudinal section through a needle scaling tool embodying the invention, the partial longitudinal section being divided into two parts with one of the two .parts showing a duplication or overlap of some of the components of the other.

Referring more particularly to the drawing, the scaling tool of the present invention is shown as including a motor housing means or motor housing 10 which is adapted to houseor carry a suitable electrical drive motor (not shown). The electric drive motor may be one of several conventional types and is connected to a source of energy through the medium of a cord or the like 12 which extends from one end of the motor housing. Motor housing 10 in this particular embodiment of the invention takes the form of an elongated hollow cylinder and is closed at one end by means of a plate or cap 14 and at the opposite end is reduced in diameter and is provided with peripheral threads 16 thereon. Motor housing 10, intermediate the ends thereof, is provided with knurling on the peripheral surface thereof, this knurled peripheral surface facilitating the use of the scaling tool by an operator as will be discussed more in detail hereinafter.

A cam drive housing means or housing 20 is carried by the motor housing 10 and, in this one embodiment of the invention, takes the form of an elongated hollow cylinder which is opened at both ends. One end of housing 20 is provided with threads 22 on the inner periphery of the housing, and the threads 22 are adapted to be received by the threads 16 on the reduced diameter portion of motor housing 10,

threads

16 and 22 providing a means for holding the two

housings

10 and 20 in rigid assembly. The two

housings

10 and 20 are threadedly connected in such a manner that the end wall 24 on housing 20 firmly abuts or engages the end wall 26 on housing 10 and the two housings, when so assembled, in elfect form one continuous or elongated housing. Both

housings

10 and 20 in this one embodiment of the invention are substantially identical in diameter and both are made of a suitable aluminum alloy to provide housings of light weight, the aluminum alloy thus assisting in reducing the overall weight of the scaling tool.

Cam drive housing 20 is provided a substantially radially inwardly extending wall 28 therein which in this particular instance is formed integral with the body of the housing. Wall 28 has a preselected thickness and is provided with port or aperture 30 therein which extends substantially axially of the housing. Port 30 is dimensioned or is provided with a diameter such that it will slidably receive the reciprocating plunger of the scaling tool, as will also be discussed more fully hereinafter.

A barrel shaped means or barrel member generally designated by the reference numeral 32 is rotatably supported within housing 20 and extends substantially axially thereof. Barrel member 32 is generally cylindrical in configuration and is provided with an intermediate portion 34 of enlarged diameter and, at one end, terminates in an end wall 36. Barrel member 32 is also provided with an axially extending bore 38 therein, one end of bore 38 terminating in end wall 36 and the opposite end thereof providing the barrel member with an open end 40. Barrel member 32 in this particular instance is made of steel rather than an aluminum alloy although it will be apparent that it also be made of an aluminum alloy or any other suitable material.

Barrel member 32 is rotatably supported within housing 20 on bearing means or bearings and, in this particular instance, the bearings take the form of a pair of antifriction or

ball bearings

42 and 44 in combination with a pair of

roller thrust bearings

46 and 48. The periphery of barrel member 32 adjacent both of its ends is reduced in diameter to provide shaft-

like ends

50 and 52 on the barrel member, and these shaft like ends are adapted to be received within the inner periphery of the inner races of

bearings

42, 44, 46 and 48. The inner races of the bearings are adapted to snugly fit the periphery of the shaft-

like ends

50 and 52 on the barrel member, and the bearings are retained in a predetermined position within casing 20 by the structure or configuration of the barrel member itself in combination with housing wall 28, the inner periphery of the housing 20 and a lock nut 53.

Lock nut 53 is substantially cylindrical in configuration and is held or retained in a predetermined position within housing 20 by means of threads 54 on the periphery thereof which are adapted to be received within threads 56 on the inner periphery of the housing. Lock nut 53 in one face thereof is provided with a pair of recesses 58 therein to accommodate the reception of a wrench or the like to facilitate the threading of the lock nut 52 within the housing 20. Lock nut 52 is provided with an enlarged aperture or port 60 therein and on the opposite face is counterbored at 62, the counterbore 62 providing a seating surface and shoulder for one race of the thrust bearing 48 and also providing a means for anchoring the thrust bearing 48 in position within the confines of housing 20. Shaft-like end 50 of the barrel member terminates in an annular shoulder 64 on the barrel member which functions as a seat for one race of the ball bearing 44 and, shaft-like end 52 of the barrel member similarly terminates in an annular shoulder 66 which, likewise, functions as a seat for one race of the ball bearing 42. The outer peripheries of the outer races of

ball bearings

42 and 44 are adapted to snugly fit the inner periphery of casing 20, and it will be appreciated that casing 20 must be dimensioned so that the ball bearings will snugly fit within the inner periphery thereof. The interior surface 68 of housing wall 28 affords a seat for one face of thrust bearing 46. It will also be understood that the barrel member 32 and the bearings are held in rigid assembly within housing 20 and so placed in such rigid assembly by tightening nut 53.

The output or armature shaft 70 of the electric motor carries a spacing collar 72 thereon which is received in port 60 in lock nut 53 and, adjacent its free end, the output shaft 70 is provided with a pair of opposed flat surfaces 74 thereon (only one fiat surface 74 shown in the drawing). Shaft 70 with the opposed flat surfaces there-on is adapted to be received in a similarly shaped passage 76 formed in the end wall 36 of barrel member 32. Passage 76 extends axially of the barrel member 32, and output shaft 70 is adapted to be slidably received therein. The output shaft 70 with the pair of opposed flat surfaces thereon and the correspondingly shaped passage 76 in the barrel member thus provide an operative and driving connection between the electric motor and the rotatably supported barrel member.

A plunger means or plunger 78 is carried within the bore 38 in barrel member 32 and is dimensioned to be slidably received therein. Plunger 78 is cylindrical in shape or configuration and is reduced in diameter at points 80 and 82 along its length primarily to reduce the weight thereof. Plunger 78 in this particular instance is made of forged steel although it will be apparent that it could also be made of any other suitable material such as an aluminum alloy. Plunger 78 terminates at one end thereof in a head portion or head 84 and, along reduced diameter portion 80, is provided with a cam groove means or cam groove 86 therein. Cam groove 86 has a preselected depth 4 and a preselected pitch and takes the form of an endless or continuous groove formed in the body of the plunger.

Barrel member 32 carries a cam follower means or cam follower which is adapted to ride or be received within the continuous cam groove 86. The cam follower in this one specific embodiment of the invention takes the form of a cam pin 88 which is carried in a passage 90 in the intermediate portion 34 of barrel 32. Cam pin 88 is provided with a threaded head 92 thereon and the head 92 is adapted to be received within a counterbore 94 within barrel passage 90. The threads on head 92 are adapted to be received within threads (not shown) in counterbore 94, and this threaded connection firmly retains the cam pin 88 within barrel passage 90. Cam pin 88 is also provided with a slot 96 in the head 92 thereof to accommodate the use of a screwdriver or the like when the cam pin is being threadedly connected to the barrel member.

Cam pin 88 riding within the continuous cam groove 86 provides a means for converting the rotary motion of the electric motor into the reciprocating movement of the plunger 78. It will be understood that each revolution of the barrel member 32 will produce one complete stroke of the plunger 78 with the plunger moving axially outwardly and inwardly of bore 38 in the barrel member. It will also be understood that cam pin 88 will continuously drive the plunger 78 through its reciprocating movement and will thus move the plunger both axially inwardly of bore 38 (to the right as shown in the drawing) and axially outwardly of bore 38 (to the left as shownvin the drawing). In the drawing, the plunger 78 is shown at the extreme inner end of its stroke and is thus in a fully retracted position. Upon rotation of the barrel member 32, however, the plunger will be moved axially to the left as shown in the drawing and, when the barrel member rotates through one half of a revolution, the plunger will have moved to its extreme extended position and will have thus moved through its power stroke. When the plunger 78 reaches its fully extended position, the continued rotation of the barrel member 32 through the other half of the revolution will again move the plunger 78 back to its fully retracted position. Thus, as the barrel member 32 rotates, the plunger 78 will be constantly and continuously reciprocated axially outwardly and inwardly of the barrel member between fully extended and fully retracted positions. The length of stroke of the plunger 78 will, of course, be determined by the pitch of the cam groove 86. The cam groove 86 in this one specific embodiment of the invention has a pitch such that one complete revolution of the barrel member 32 produces a length of stroke of the plunger of one quart r of an inch.

Cam drive housing 20 carries a needle scaling head generally indicated by the reference number 98. Needle scaling head is comprised of a housing means or housing 100 which in this one specific embodiment of the invention assumes the form of an elongated hollow cylinder which is opened at both ends. Housing 100 is provided with a peripheral flange 102 thereon adjacent one end thereof (the right end as shown in the drawing), and this end of the housing 100 is adapted to be slidably received within the open end of cam drive housing 20. Housing 100 is rigidly connected to housing 20 by means of a collar 104, the collar 104 being provided with internal threads 106 thereon which are adapted to be received within threads 108 on the periphery of housing 20. Collar 104 provides a rigid connection between cam drive housing 20 and needle housing 100, and, when the two housings are in assembly, flange 102 is adapted to abut the end wall of cam drive housing 20. Peripheral flange 102 is carried in a predetermined position on needle housing 100 and, in being so positioned, limits the depth of insertion of housing 100 into the open end of cam drive housing 20. It will also be noted in the drawing that peripheral flange 102 is formed integrally with the body of needle housing 100 in this particular instance. Needle housing 100 in this one specific embodiment of the invention is made of steel, as is the collar 104, although it will be appreciated that both of these components could just as readily be made of any other suitable material such as an aluminum alloy.

A needle retainer means or needle retainer 110 is slidably carried within needle housing 100 and in this particular instance assumes the form of an annular, substantially cup-shaped member having a side wall 112 and a bottom wall 114. Bottom wall 114 is provided with a plurality of spaced, axially extending passages 116 therein, and each passage 116. is adapted to slidably receive and retain therein a needle means or needle 118. Each needle 118 is provided with a substantially frusto-eonically shaped head 120 thereon and each such head is adapted to be received or seated within a similarly shaped recess 122 in one face of needle retainer bottom wall 114, each recess 122 of course being axially aligned or symmetrically positioned with respect to one of the passages 116 in the needle retainer bottom wall. Needles 118 are made of a hard and flexible steel and, in use, must be capable of flexing or bending without being subject to breakage.

Needle housing 100 carries a resilient means therein and, in this particular embodiment of the invention, such resilient means assumes the form of a compression spring 124. One end of compression spring 124 is received within side wall 112 of needle retainer 110 and is adapted to seat on the bottom wall 114 of the needle retainer. The opposite end of spring 124 is adapted to seat on an inturned fiange 126 on the end of the needle housing 100. It will be noted in the drawing that spring 124 has a diameter such that the needles 118, extending axially of and beyond the needle housing 100, are carried or positioned within the spring. It will also be noted in the drawing that spring 124 will constantly urge the needle retainer 110 and the plurality of needles 118 carried thereby toward engagement with the head 84 on plunger 78. In the fully retracted position of the plunger 78 as shown in the drawing, the spring 124 will of course bias the needle retainer axially of housing 100 into engagement with plunger head 84.

A guide means or guide 128 is carried by housing 100 and, in this particular instance, takes the form of an elongated substantially cylindrical sleeve. The end of sleeve 128 that is positioned on housing 100 is split or is provided with a longitudinally extending slot 130 therein and, on both sides of slot 130, carries or is provided with a pair of upstanding ears or tabs 132 (only one shown). Each ear 132 is provided with a hole or port 134 therein, the two holes 134 providing a passageway for a bolt or the like (not shown). The bolt is adapted to carry a nut (not shown) which when tightened on the bolt provides a means for rigidly connecting or clamping the guide sleeve 128 to the casing 100. The opposite end of guide sleeve 128 is converged or turned inwardly at 136 to provide a constricted open end 138 on the guide sleeve, the constricted open end 138 in this particular instance assuming a substantially rectangular shape or configuration (not shown). Open end 138 is constricted into the substan: tially rectangularly shape in order that the ends 140 of the needles projecting beyond the end of the guide sleeve may be retained in a bundle-like or cluster-like assembly so that they may be eifectively directed at a surface to be scaled or cleaned. Since guide sleeve 128 is clamped on housing 100, the position thereof on housing 100 may be selectively varied. The guide sleeve is preferably clamped on the housing in such a position that the end 138 thereof is positioned approximately an inch and a half from the free or working ends 140 of the needles. Guide sleeve 128 is carried on a reduced diameter portion 142 of housing 100 and, when moved to its extreme retracted position on housing 100, is adapted to abut a shoulder 144 formed on the periphery of housing 100, the shoulder 144 thus serving as a stop to limit the axial movement of the guide sleeve on the housing.

Rotation of plunger 78 within the bore 38 of the barrel member is prevented by means of a pin means or pin 146 which is slidably carried within a longitudinally extending peripheral groove or recess 148 formed in the periphery of the plunger. Pin 146 is carried within a passage 150 in the wall of housing and is retained within housing passage by means of a set screw or the like 152. Set screw 152 is in turn carried within a threaded passage 154 in cam drive housing 20, the two

housing passages

150 and 154 of course being aligned. Set screw 152 is provided with the usual slot 156 therein to accommodate the reception of a tool such as a screw driver or the like.

Means is provided to permit the introduction of a lubricant into cam groove 86 and, in this one embodiment of the invention, this means takes the form of a passage 158 in barrel member intermediate portion 34. Passage 158 communicates with a counterbore 160 in barrel member intermediate portion 34 and counterbore 160 is threaded (not shown) and is adapted to be sealed by a threaded plug 162. Barrel member passage 158 and counterbore 160. are adapted to communicate with a port 164 in cam drive housing 20, which port is likewise threaded (not shown) and is adapted to be sealed by a threaded plug 166. Threaded plugs 162 and 166 are both provided with the usual slots in the heads thereof to permit a suitable tool such as a screw driver to be applied thereto.

Adjacent to cam groove 86, plunger 78 is provided with a pair of peripheral recesses or

grooves

168 and 170 therein and the grooves are adapted to seat a pair of O-

ring seals

172 and 174, respectively. The O-

ring seals

172 and 174 in function serve to retain the lubricant in barrel member bore 38 in close proximity to the cam groove 86 and cam pin 88 and thus insure that the groove and pin will be constantly lubricated.

To assemble the scaling tool of the present invention, plunger 78 with the two O-

ring seals

172 and 174 thereon is first inserted into axial bore 38 in barrel member 32. Cam pin 88 is then threadedly connected to barrel member 32 in such a manner that the pin is received in cam groove 86. The

bearings

42, 44, 46 and 48 are then placed upon the shaft-like ends 58 and 52 of the barrel member, and then the assembly comprised of the barrel member, the plunger and the bearings is inserted as a unit into cam drive housing 20. Lock nut 53 is then threaded into cam drive housing 20 and tightened therein into a position until all of the components of the assembly are rigidly retained within the cam drive housing. The cam drive housing is then threaded or turned onto the motor housing 10 with the flattened armature shaft 74 of the motor being received within the axially extending passage 76 in the end wall 36 of the barrel member. Needle housing 100 with the needle retainer, needles and spring therein is then inserted into the open end of cam drive housing 28 and pin 146 is then inserted into needle housing passage 150 to prevent the rotation of barrel member 78. Threaded plug 152 is then inserted into cam drive housing passage 154. Collar 104 is then applied to the threaded portion 108 of cam drive housing 20 to rigidly connect the needle scaling head to the cam drive housing. With the guide sleeve 128 being clamped on housing 100 in a pre-selected position the needle scaling tool is now ready for use or operation.

In using the scaling tool, the operator first grasps the knurled portion 18 of the motor housing with one hand and the periphery of needle retainer housing 100 with the other. As power is supplied to the electric motor of the tool, the barrel member 32 Will rotate and, through the medium of the cam pin 88 and cam groove 86, Will impart reciprocatory movement to the plunger 78. As barrel member 32 moves through one half of a revolution, the cam pin 88 and cam groove 86 will move the plunger axially outwardly of the barrel member and will thus move the plunger through the power half of its stroke. As the barrel rotates the remaining half of the revolution, the cam pin and groove will move the plunger axially 7 inwardly of the barrel member and will thus move the plunger through the retraction half of its stroke. The plunger 78 will thus be constantly and continuously driven by the motor and in both directions of travel.

On the power half of each stroke, the head 84 of the plunger will strike the needle retainer 110 and the needle heads 120 a sharp blow and will drive the needle retainer and needles axially outwardly of the housing 100 into contact with a surface to be scaled. On the return half of each stroke, the spring 124 will urge the retainer and needles axially inwardly of the housing 100 and will move them into a position where they can again be struck by the plunger head 84 on the next power half of the stroke of the plunger. Thus, acting under the influence of the plunger 78 and the spring 124, the needles 118 will be cyclically and repeatedly impelled and moved axially outwardly and inwardly of the housing 100 into contact with a surface to be sealed.

The free or working ends 140 of the needles will repeatedly strike the surface to be cleaned with a series of sharp blows. These sharp blows will loosen or dislodge the material from such surface, and the needles will at the same time undergo a lateral whipping action which will remove the material from such surface. When pressure is applied to the needles by the operator of the tool or, in other words, when the needles are pushed into engagement with a surface to be scaled, the needles will flex or bow upon striking such surface, as illustrated in dotted lines in the drawing within the guide sleeve 128.

As the needles 118 become shortened or worn away in use, the position of the guide sleeve 128 on housing 100 can be selectively varied to maintain the desired spacing between the ends 138 of the guide sleeve and the working ends of the needles. When the needles 118 become too short for use, they of course must be replaced and this can readily be done by merely removing the housing 100 from the cam drive housing 20 which provides ready access to the interior of needle retainer housing 100.

The present invention provides a compact and light weight scaling tool and one having a slim silhouette, all of which is mainly due to the fewer number of components employed in the tool as compared to prior art devices and the axial arrangement of substantially all of the components thereof. The axial arrangement of the components, especially those within the cam drive housing 20, permits the components to be made as small as possible and thus enables the components to be carried or packaged within housings having small diameters compared to their lengths. Scaling tools incorporating the present invention have been constructed and successfully used wherein one inch ball bearings have been employed to rota'tably support the barrel member thereof. Needless to say the tool could be even further miniaturized without any difficulty and without interfering in any way with the successful operation thereof.

Having thus described one specific embodiment of the invention, it will be appreciated and understood that numerous other structural modifications and adaptations may be resorted to without departing from the scope of the invention as defined by the appended claims.

What is claimed is:

1. A needle scaling tool comprising:

electric motor means;

first housing means connected to said electric motor means and extending axially thereof;

barrel means rotatably supported within said housing means in axial alignment therewith and being driven by said motor means; plunger means slidably and axially received within said barrel means and having cam groove means therein;

cam follower means carried by said barrel means and being receivable within said cam groove means in said plunger means;

second housing means detachably connected to said first housing means and extending axially thereof;

one end of said plunger means being slidably received within said second housing means;

needle retainer means slidably carried within said second housing means;

needle means slidably carried by said needle retainer means and extending axially outwardly of said second housing means; and

resilient means carried within said second housing means constantly urging said retainer means and said needle means toward engagement with said one end of said plunger means;

said cam follower means being operable upon rotation of said barrel means to impart reciprocatory movement to said plunger means to thereby cyclically and repeatedly impel said needle means outwardly of said second housing means into contact with a surface to be scaled;

wherein said needle retainer means is substantially cupshaped in configuration and is provided with a plurality of passages in the bottom Wall thereof;

said needle means takes the form of a plurality of elongated and flexible needles, one of which is slidably received in each passage in said bottom wall of said retainer means;

said needles having heads thereon adapted to seat in countersunk portions in one face of said bottom wall of said needle retainer means;

said resilient means carried within said second housing means takes the form of a compression spring;

one end of said compression spring being seated on the opposite face of said bottom wall of said cupshaped needle retainer means and the opposite end of said compression spring being seated on an inturned flange on the opposite end of said second housing means.

2. A needle scaling tool comprising:

electric motor means;

barrel means rotatably supported within said housing means in axial alignment therewith and being driven by said motor means;

plunger means slidably and axially received within said barrel means and having cam groove means therein;

cam follower means carried by said barrel means and :being receivable within said cam groove means in said plunger means;

needle retainer means slidably carried Within said second housing means;

wherein said plunger means carries peripheral lubricant seals therein on opposite sides of said cam groove means; and

wherein said barrel means and said first housing means have sealable lubricant passages therein for the introduction of a lubricant into said cam groove means.

3. A needle scaling tool as claimed in claim 2 wherein said motor means includes an output shaft the end portion of which has a pair of opposed flat surfaces thereon;

the end portion of said output shaft being slidably received within a correspondingly shaped axially extending passage in one end wall of said barrel means;

said pair of opposed flat surfaces on said end portion of said output shaft and said correspondingly shaped passage in said end wall of said barrel means providing a driving connection between said motor means and said barrel means.

References Cited UNITED STATES PATENTS 2,490,449 12/1949 Lynch 7457 10 2,672,677 3/1954 Von Arx 29-81 2,677,885 5/1954 Chaun 15 23 X 3,150,888 9/1964 Parker 29--81 X OTHER REFERENCES German application, 1,027,039, March 1958.

10 WALTER A. SCHEEL, Primary Examiner.

I. M. NEARY, Assistant Examiner.

Claims

1. A NEEDLE SCALING TOOL COMPRISING: ELECTRIC MOTOR MEANS; FIRST HOUSING MEANS CONNECTED TO SAID ELECTRIC MOTOR MEANS AND EXTENDING AXIALLY THEREOF; BARREL MEANS ROTATABLY SUPPORTED WITHIN SAID HOUSING MEANS IN AXIAL ALIGNMENT THEREWITH AND BEING DRIVEN BY SAID MOTOR MEANS; PLUNGER MEANS SLIDABLY AND AXIALLY RECEIVED WITHIN SAID BARREL MEANS AND HAVING CAM GROOVE MEANS THEREIN; CAM FOLLOWER MEANS CARRIED BY SAID BARREL MEANS AND BEING RECEIVABLE WITHIN SAID CAM GROOVE MEANS IN SAID PLUNGER MEANS; SECOND HOUSING MEANS DETACHABLY CONNECTED TO SAID FIRST HOUSING MEANS AND EXTENDING AXIALLY THEREOF; ONE END OF SAID PLUNGER MEANS BEING SLIDABLY RECEIVED WITHIN SAID SECOND HOUSING MEANS; NEEDLE RETAINER MEANS SLIDABLY CARRIED WITHIN SAID SECOND HOUSING MEANS; NEEDLE MEANS SLIDABLY CARRIED BY SAID NEEDLE RETAINER MEANS AND EXTENDING AXIALLY OUTWARDLY OF SAID SECOND HOUSING MEANS; AND NEEDLE MEANS SLIDABLY CARRIED BY SAID NEEDLE RETAINER MEANS CONSTANTLY URGING SAID RETAINER MEANS AND SAID NEEDLE MEANS TOWARD ENGAGEMENT WITH SAID ONE END OF SAID PLUNGER MEANS; SAID CAM FOLLOWER MEANS BEING OPERABLE UPON ROTATION OF SAID BARREL MEANS TO IMPART RECIPROCATORY MOVEMENT TO SAID PLUNGER MEANS TO THEREBY CYCLICALLY AND REPEATEDLY IMPEL SAID NEEDLE MEANS OUTWARDLY OF SAID SECOND HOUSING MEANS INTO CONTACT WITH A SURFACE TO BE SCALED; WHEREIN SAID NEEDLE RETAINER MEANS IN SUBSTANTIALLY CUPSHAPED IN CONFIGURATION AND IS PROVIDED WITH A PLURALITY OF PASSAGES IN THE BOTTOM WALL THEREOF; SAID NEEDLE MEANS TAKES THE FORM OF A PLURALITY OF ELONGATED AND FLEXIBLE NEEDLES, ONE OF WHICH IS SLIDABLY RECEIVED IN EACH PASSAGE IN SAID BOTTOM WALL OF SAID RETAINER MEANS; SAID NEEDLES HAVING HEADS THEREON ADAPTED TO SEAT IN COUNTERSUNK PORTIONS IN ONE FACE OF SAID BOTTOM WALL OF SAID NEEDLE RETAINER MEANS; SAID RESILIENT MEANS CARRIED WITHIN SAID SECOND HOUSING MEANS TAKES THE FORM OF A COMPRESSION SPRING; ONE END OF SAID COMPRESSION SPRING BEING SEATED ON THE OPPOSITE FACE OF SAID BOTTOM WALL OF SAID CUPSHAPED NEEDLE RETAINER MEANS AND THE OPPOSITE END OF SAID COMPRESSION SPRING BEING SEATED ON AN INTURNED FLANGE ON THE OPPOSITE END OF SAID SECOND HOUSING MEANS.