US 2711098 A
Description (OCR text may contain errors)
June 21, 1955 R; AMES 2,711,098
MAsTIc-APPLYING AND sURFAcING-FINISHING TooLs Filed Apri; 21, 1952 4 sheets-sheet 1 INVENToR. RQKERT G. AMES R. G. AMES June 21, 1955 4 Sheets-Sheet 2 Filed April 21. 1952 oJ ...J u @M4 1m W. m V Y me r O m E BR 5A Y Q w 2 I 5 5 O 2 a .E DI /C l 4 Sheets-Sheet 5 ATTORNEYS June 2l, 1955 R.' G, AMES MASTICAPPLYING AND SURFACING-.TFINISHING TOOLS Filed April 21, 1952- K1 O Dn mM NA E. V me v A T R LM @il 3R n 3 w. ALJ- I ll. 5 c .O 3
June 21, 1955 R, G, AMES 2,711,098
MASTIC-APPLYING AND SURFACING-FINISHING TOOLS Filed April 2l. '1952 y 4 Sheets-Sheet 4 76 :l loq 785 22 IBI |I K ,47 aQH J' v8| 52' E P8047" K t -1| i f 74 N: g
l l/ I4 57' @o eo' 57" INVENTQR. d 'VRoBER-r G. AMES ATTORNEYS 2,711,098 Patented June 21, 1955-r MAsrrc-APPLYING AND SURFACING.-` FINISHING TooLs Robert G. Ames,.Burlingame, Calif., ussiguor of onehalf to George W. Williams aud one-fourth to Stanley Ames, both of Burlingame, Calif.
Applicauun April 21, 19,52, serial No. 283,378
s claims. (ci. 'l2-13o) The present invention relates to mastic-applying andI :5. along the line V V of Figure-6, omitting the 001 body,-
surface-nishing tools. More particularly it embodies improvements over the finishing tool disclosed in my United States Letters Patent No. 2,571,096, dated October 16, 1951; and, also, includes further improvements with respect to my copending application on a masticapplying and inishing tool, Serial No. 244,786, `which was tiled in the United States Patent Office on September l, 1951, now Patent No. 2,666,323.
In constructing walls and ceilings from plaster boards and the like, it is necessary to ll spaces between adjacent boards with a suitable mastic. Also, it is a common practice to nail such boards to studs, and these nails are set into. the boards. The heads on these nails form depressions in the applied boards, which must be filled` .with mastic to provide a finished surface.
Broadly speaking, I provide a tool body having a recess adapted to receive mastic, which may be placed therein manually or delivered thereto under pressure. This recess opens toward the board-engaging face `of the tool to provide an outlet through which the mastic may be ejected as the tool is advanced over the boards to thereby till spaces or depressions then existing in these boards. ln connection with this body, there is provided a troweling bar disposed to smooth the mastic delivered to the boards, forming a desired crown on the troweled mastic.
This invention has reference to the mechanisms for supporting and ejecting the mastic from the tool body, in accordance with the requirements, and to withdraw' any excess mastic that may have been delivered to the boards.
More specifically, this tool body has a swingablymounted plate arranged in the mastic-receiving recessA thereof. After the body has been moved into close contact with the boards to which the mastic is to be applied, this plate is moved so as to eject the proper amount of mastic into spaces or depressions defined in theliboards, all excess mastic being troweled olf as the `tool is advanced.
As a still further object, it is proposed to attach suitable handle to the swingable plate for moving the f latter to eject mastic from the tool body, while at the same time controlling the pressure thus applied to the plate so that the body will be held firmly up against the` surfaces of the wall boards.
Another object is to provide a tool of the character described, which may be conveniently held inone hand of an operator and readily manipulated while applying mastic to wall boards.
Other objects and advantages will appear as the spec-v ication continues, The novel features will be set forth in the appended claims.
DRAWINGS For a better understanding of my invention, reference should be had to the accompanying drawings, forming part of this application, in which:
Figure 1 is a side elevational view of one form of the 2. tool, disclosing'it being supported by one hand of an operator and used for applying mastic to a vertical surface;
Figure 2 is, an
, plate partially depressed-for ejecting mastic'ffrom ythey tool body; f
Figure 4 is a centrallongitudinalfsectionalview takenv along the plane IvV-IVfof Figure 2, disclosing the swingable plate in retracted position;
Figure 5 is a vertical view`, partly inA section, taken of a Yballline V1II-'VIII of Figure 6, disclosing the mechanism' for resisting upward curving of` thetroweling bar, and
vfurther showing a depression being iilledwith mastic;
Figure 9 is a side Ielevational view of a larger4 tool, in which masticis fed thereto under pressure;
Figure 10 is a sectional view taken along the plane X-X offFigurev 9, looking-at the back of this larger tool; i
Figure 1l is a 'sectional view illustrating a motor-controlling switch employed 'in the larger tool, this view being taken along fthelo'ngitudinal plane XI-XI of Figure V10, y
` Figure l2 is aview taken along the plane XII-XII of f Figure l0, looking /atkthe trailing end'of the-larger tool,
andV illustrating mastic being appliedto a joint b wall boards and in depressions in the latter; and
' Figure 13 is a diagrammatic view showing a motor and etween vpump for deliveringvmastic to the larger tool, andy disclosingra wiring diagram., y
While I haveshown only the preferred forms of 'my invention, itishould be understood thatvarious changes, or modifications', may be made within thel scope ofthe annexed claims without departing :from the spirit thereof.
DETAILED DEsCruPTroN i l First embodiment vReferring now tothe iirst'forrn of my invention, as shown in Figuresfl to 8, inclusive, I have 'showna tool body indicated` generally'v at A. 4This body includes an elongated trailing wall 10 having a'pair of parallel upright', plates 11 secured to opposing sides thereof by screws 12, j
As clearly lshown in Figure 6, the wall 10 and plates 11 form. the body A into4 or other suitable fastening means.
a channel-shaped structure, which may be moved toward a wall surface 14 in the manner suggested in Figures 1-4 and 7 of the drawings, and advanced'thereover as indicated by the arrows 15 (see Figures 1 and 4). Broadly speaking, the side plates 11 and vwear shoes B con'-,
stitute runners, which are adapted to slide overa wall surface.
' In order to prevent the vbottom ledges 11a of fthe side; plates 11 from wearing yas the tool is adya'ncedfover the wall surface 14, l make use vofapairfof fwearjsh'oes B,
These shoes are secured by'screws 16 and 17 Yto outerure 7, to preclude these edges from contactingdirectly vwith the surface 14 of Awall board or the like. These wear shoes may be made from hardened material so as elevational view looking at thetrailngvr end of kthis same tool, as seen from the plane II--II of 3 to withstand considerable use, and may be replaced from timet0tim.e.....
It will be noted that a rectangular-shaped mastic-moving plate C is mounted in the channel defined by the trailing yvall 1,0 and the parallel side plates 11. plate C has a width coextensive kWitlithe distancel between the innermost faces of the sideiplates and has a sliding t withthe latter, anda length .to extend from an. inner curved face.. 419. .Of the trailing Wall 10 to teadingedges 20 of the side plates.
Furthermore, the plate Cis supported forswinging movement onfthe screws 1.7. .the :latter being arranged near the leading edges 20 provided byk side plates 1,1, The curved face 1'9, previously mentioned, defines an are, Whose Center. coincides with the aligned. .axisof Ythe: opposing screws 1j. Thus, when the plate C ismoved toward or away from the wall surface 14 during use ot the tool, a rear edge L21 of this plate will maintain a slidingcontact with the curved face 19 at all times.
The trailing wall 10, siderplatesll, and the Plate C coact to define a mastic-receiving recess D., which has an outlet mouth opening toward the front of the tool so that mastic E disposed in this recess maybe ejected therefrom againstthe wall surfaceL 14 along which the tool is advanced. When the plate C is fullyretracted, as in Figures l and 4, it extends .upwardlyarld rearwardly .from the pivot screws 17 in angular relation, with respect `to the wall-engaging llanges 18 of the wear shoes B. At this time, `the rear edge 21 of the plate C 4abuts a limit stop 2 2, which is anchored by a screw 23 tothe back of the trailing wall 10 (see Figures 3 and).y This stop projects from the wall 10 so as to overlie the curved yface 19 of the plate C, and prevents the latter from accidentally swinging rearwardly out of the recess D of the tool.
As s hown in Figure 3, the platre C has been partially depressed, and thus part of themasticfEhas been forced thereahead upon the wall surface 14. When this plate is fully depressed, its forward face 24 will ybe disposed substantially ush with the wear shoe anges 18, resulting in eject'ing practically Vall of the mastic from thev recess.
Forl the purposes of supporting thetool and actuating the plate C, l have provided a handle;*designatedV generally at F, which is fastened tothis plate by a ball-joint G. This handle may be providedwith a grip 2S so that it may be grasped in one hasndH'oLf a'nop'erator, assug- I gested in Figure l. It will be observed thattheinner section 26 of the handle, upon which the` ball-joint G is mounted,'exgtends `at an angle relative tothe outer section p 27 to which the grip 25 is attached.
The entire handle F isprOportiOned so that it may be grasped firmly by the operator, and the tool body A moved up against the 'wall surface 14, followed by ad vancement of the tool in the direction of the arrows Y15, all movements being Vunder control of thefoperator.
Y As shown in Figure l, the operators thumb ,28 may be e.
placed on the inner section 26 of the handle, the fingers 2? Wrapped around the grip 25, and the indes finger. 30 (or other digit) extended to engage with a curved bracket 31 projecting from the plate C. This bracket is secured by a screw 32 to the rearface vof, the plate C -at a point ahead the joint G and adjacent to the leading edge 33 of the plate C. j p
Quite obviously, the operator may press on the handle F so as to depress theswingable plate C, and thereby eject mastic E'frorn the recess D. Also, the operator may retract the plate C to withdraw excess mastic from the y wall surface 14 vupon kwhich the mastic has been applied. The operator has complete control over the movement of the tool body A toward-the wall surface, advancement ofthe tool over this surface, and depressing or retracting of the swingable plate, even thoughonly one hand is employed -for these combined steps. Y
The ball-joint G has been constructed in such a manner as`to allow the handle F to be freely swung up 'and down with respect to the Aplate C, as suggested by the This ` arrows 34 in Figures `l and 4. This is `accomplished byv providing anV elongated slot 35 in a cap 36 through which,
f jof the latter. k the side plates 11 are fashioned with notches 47 .through a shank 37 on the handle section 26 projects. The length of this slot extends longitudinally in the direction of the trailing and leading edges 21 and 33, respectively, of the plate C (see Figure 6). However, the width of this slot permits only limited lateral. swinging of the shank 37, as suggested bythe arrow 38 in Figure 5. The ball 39 of this jointl is -conlined in a socket 'member 40 by the cap 36, and this member in turn is fastened to the plate C by any suitable means, such as bywelding.
It will be appreciated, of course, that an extension 41 (see Figure 4) may be provided on the handle F, if desired. Thiswilljallow the operator to reach upper portions of a wall or apply the tool-A upon a ceiling, in the` manner shownv in my Patent` No. `2,571,096 and the copending case, Ser. No. 244,786.
As an important structural feature of my improved tool, a leaf spring 42 is secured byl alug .43,v a curved guard 44 and screw `45.19 the back of therv plate C (see Figure 3). This spring projects. rearwardly from the plate C, and abuts against-the outer end 22a of the limit stop 22 when the plate C is fully retracted, Aas. in Figure l. As 'shown in this view, the spring 42 extends at an angle relative tothe plate C, and yieldingly urges .the latl' ter into. retractedv position Whenever. pressure .is relaxed on the handle F. The purpose .of lthe .guard` 44 is to lbear against.Y and .support the spring, Apreventing .the latter from vbreaking asrthe'plate C approaches the bottom `of i its stroke.
Comparison of .Figuresvl and 3 will-disclose the .factl that the leaf spring 42 .is stiffer, or stronger, during. ini
tiall depressing of the plate C -than it Will be inthe :latter part of the movement of theupla'te :C toward theswall sur--l face 14.. r-l'his may he readily understood byA observing .the lever 'a existing along the length of the spring from thelug 43 to the point of .contact between `the spring and the outer end 22a of the `stop 22 'in Figurell, and then noting- .Y 7.7 a relatively longer leverib along the length of the spring in Figure 3. 1
Accordingly, as pressureis .applied initially lto the .haueV dle F, the greater part vof this ,pressure will be utilized fin` holding the tool body A up against the wall surface 14.
and precluding the mastic E from 'escaping fromv nnder- Y neath .the tool body. However, as further pressure isapplied -to the handle, the springAZgwillbecome. progressively weaker and a greater portion` of this pressurewill Y bolexerted upon'rhe mastic. Y
After the tool has been advanced n tlierarrow 15 for a .predetermined distance, it' may be raised away from thewall surface `14. Asthe .handle F isiretracted, `the plate C lwill return therewith, andV thisA will draw any-excess `mastic back into the recess DfroruVw the wall surface., This lis'raided` by :the spring 4 2, and
is accomplished before the-weari-shoe flanges 18 clear the .surfaceof the walls so as Ito preclude smearing of the mastic. k
Any suitable Ameans may be employed for placing the mastic E in the recess D. For instance, the open face...
of the tool onto which the recess opens may be scooped into a supply of lmastic or the `latter-placed therein yby using a trowel.
forth in detail with referencetothe embodiment lof the invention shown in Figures 9 to 13, inclusive.
for containing and spreading thisjmastic.k
versely of the trailing wall 10 in the forward surface Furthermore, the Vbottom edges llaof in the direction of Furthermore, mastic may be delivered to this recess under pressure, inthe lmanner to beset Y.
A Sr a further method,v a quantity 'of `t`he' mastic may be v placed on the wall board, and then Vthe tooll employed chinees" which the end section of this bar projects (see' Figures ures l and 7. These plates are butted flatwise against n the outermost surface of the wear shoes B, and have fingers 48 adapted for fitting into bifurcated ends 49 of the troweling bar (see Figures 1, 2 and 8),.
In Figures 1 and 6, I show the screws 16 and 17 as passing through the bar-retaining plates K and into the side plates 11. As clearly shown in Figures l and 7, the screws 16 are inserted through slots 50 formed in the plates K. The screws 16-17 may be loosened so that the plates K can be tilted for the purpose of projecting the troweling bar J to a greater or less extent relative to the trailing wall 10. Thus, this bar may be adjusted to compensate for wear thereon. Upon tightening the screws 16-17, the ends of the troweling bar are held in position relative to the side plates 11, while the intermediate portion of the bar may be exed upwardly.
As a further meansrof regulating the troweling bar from time to time, I make use of a pair of adjusting screws 51, which are threaded forwardly through the trailing wall so as to bear against end sections of this bar (see Figures 2, 6 and 8). These screws vare adapted to be turned so as to project the troweling bar as the latter wears down.
The troweling bar J is semi-flexible and may be exed under pressure so as to produce a crown 52 on the troweled mastic (see Figure 8). However, in order to reduce the amount of curvature on this crown, I provide a bar-pressure-regulator L. The latter included a slidable pressure-adjusting pin 53 arranged to apply forward force to the bar I at the center of the latter to resist rearward curving of intermediate portion of this troweling bar (see Figures 2, 4, 6 and 8).
For varying the amount of forward pressure exerted upon the pin S3, and thereby control the exing of the troweling bar, a leaf spring 54 is mounted to extend lengthwise of the bar I, and is positioned rearwardly beyond the trailing wall 10. Posts 55 extend from this trailing wall and adjustably support the ends of the spring 54. Also, nuts 56 are mounted on the pin 53 to adjust the latter relative to the spring 54 (see Figures 2 and 8).
While l do not wish to be limited with'respect to the many uses to which this tool may be placed, reference to Figure 8 will disclose one use by way of example. secured by a nail 58 to a wall stud 59. The head of this nail has been set below the board surface 14, which As shown therein, a wall board.5 7 has been 6 movement of the plate C, the shoe anges 18 and troweling bar will be maintained in contact with the wall board.
Now the tool is advanced over the wall board, as suggested by the arrows inFigures l and 4.V This will result informing a crown 52 on the troweled mastic and at the same time filling any depressions 66 with mastic, -as in Figure 8. The curvature of the crown may be controlled by adjusting the leaf spring 54 of the bar-pressure-regulator L on the pin 53 and posts 55. The troweled mastic will be feathered laterally, merging into the wall board surface.
As further pressure is exerted upon the plate C by the operator pressing against the handle F, thereby moving the front face 2,4 of this plate toward the wall board has resulted in forming a depression 60 inthe board.
However, advancement of the tool has filled this depression with mastic E. At the same time, the troweling bar I has provided a crowned surface on this mastic, which feathers laterally into the surface 14 of the wall board without interruption.
SUMMARY OF OPERATION First embodiment Assuming that the recess D of the tool body A has been filled with mastic E, as disclosed in Figure `4, an
operator grasps the handle F in one hand H (see Figure 1' l), and then moves the open face of thetool against the wall surface 14 upon which the mastic is to be ap- However, during the forward surface 14, the effect of the leaf spring 42 will lessen, bringing `greater pressure upon the mastic E and less upon the tool body A. However, the flanges 18 and the troweling bar J are held flush up against the wall board surface, preventing the mastic from escaping under the side plates 11.
From time to time the bar-retaining plates K and the screws 51 may be adjusted so as to project the troweling bar I from thel trailing wall 10 to compensate for wear on this bar. It is desired ythat the `troweling bar be made of sufficiently resilient materiall that it will yield prior to the leaf spring 42. v
When reaching the end of a stroke, pressure mayA be relaxed upon the handle F. The spring 42 will cause the plate C to retract, thereby removing any excess mastic from the surface of the wall board.
The tool may be moved over a row of depressions 60, which have been formed by nails 58, and all of these depressions filled with mastic, as shown in Figure 8. Of course, other spaces in a wall board may be lled in a similar manner.
Second embodiment N (see Figures 10-12) so as to feed mastic automati` cally to thetool, and by the substitution of a different type of troweling bar-pressure regulator L. Also, in the second embodiment, the tool body A", the swingable plate C' and troweling bar J are somewhat wider than in the form previously described in connection with Figures 1 8.
The side plates 11, wear shoes B, handle F, bar-retain ing. plates K and spring 42 are identical in both tools Accordingly, like numerals have been employed to designate corresponding parts in the two embodiments of the invention. l f
As shown in Figure 13, a hopper 61 is provided for holding a supply of the mastic E. The latter is conveyed from the hopper through a conduit 62 to the intake of a pump 63. A exible hose 64 connects the outlet of this pump with the interior of the handle F. The sections 26-27 defined by this handle are hollow so that mastic may be conveyed therethrough to branch hoses 65. The latter lead to fittings 66, which are threaded into the plate C' so as to discharge mastic under pressure to the enlarged recess D of the modified tool.
It will be noted that the pump 63 is operated from an electric motor 67 by a belt and pulley drive 68. Whenever this motor is rotating, mastic E will be withdrawn by the pump 63 from the hopper 61, vand forced through the hose 64, handle sections 27-26, branch hoses 65 and fittings 66 to the mastic-receiving recess D.
For the purpose of operating the motor 67 so that mastic will be delivered automatically to the recess D at the Vproper pressure, the switch N is mounted on an insulated block 69 carried by the back of the swingable plate C. Generally speaking, the switch is opened when the plate C is retracted, as in Figures ll and 13. Howmotor inY motion and thereby replenish/,the supply of' mastic in this recess,
In its structural features, the switch N includes a pair of resilient terminal strips 70' and' 71, which are separated one from the other when the switch, N is opened. Figure 13 shows the strip 70 as being"connected by a wire 72 to one side of a source of electrical current 7f3, while the strip 71; has a wire 7'4 leading therefrom to the motor 67'. Another wire 75 vruns from this motor to the other side of the current source 73, thus completing the circuit. Obviouslygthe switch N must be closed i'n order to set the motor in operation and thereby deliver" mastic under pressure to the recess D' of the modiiied'tool Referring to Figures l()V to 13, inclusive, it will be seen that an insulated block 76v is mountedv onk theV rear face a of the trailing wall 10'. The free ends of the terminal strips 70-71 overlie and normally are-` spaced from the block 76 when the swingable plate C" is fully retracted, as in Figures l1 and 13. However, during initial depressing of the plate C toeject mastic from the recess D', the block 76 will cause the strips 70;-71 to move into Contact with one another, and' hold the switch N' closed during further depressing of' the plate Cf.' Aca cordingly, mastic will be delivered to the recess. D" until` such time as the plate C has been retracted suficiently to` allow the terminal strips 7 0--714 to separate andl open the electrical circuit;
With respect to the bar-pressure-regulator L for controlling the flexing of the troweling bar J', f make useof' a resilient lever 77, which is arranged to extend substantially parallel to the troweling bar 1"" and thejrear face 10a of the trailing wall 1%. This lever is sl'idabl'y mounted on a centrally-disposed post78', and'may. be adjusted toward or away from the facel 10a by a nut' 79 threaded onto this post (see Figure l2).
A pair of pressure-adjusting pins'80 are interposed between the lever 77 and the trowelingbarI at separated points along the length of the latter-,thus resisting rearward curving of the troweling bar; It Will'be noted from provided between two adjacent wall boards 571 Also,
the mastic disclosed in'Figurc 12 fills' depressions 602, which have been formed by nails 5S'V used for securing these wall boards to a stud 59". crown 52' is such that the applied mastic feathers laterally into the surface 14 of the boards. This curvature may be controlled by regulating the adjusting nutL 79? tomeet the requirements. l
Summary of operation-second embodiment In applying mastic E to the surface 14`of wall boar-.dsV
57', for instance, the operator grasps the handle-F in the same manner as shown in Figure 1, and moves the flanges 18 of the wear shoes B up against the wall surface. As the handle F is pushed toward the wall, the leaf. spring 42 will yield, allowing the swingable plate*` C to be depressed and thereby forcing mastic from the tool recess D' upon the wall boards. Y plate, the switch N is closed automatically, resulting, in starting the motor 67 and thereafter pumping1 additional mastic E to the recess D' to replenish and maintain the proper supply of mastic therein. When the plate C' is retracted, the. switch N will open,4 cutting. off further delivery of mastic to the tool at this time.. i
When this tool is advanced overV thejoint, formed bytheA adjacent wall boards 57",.for instance, the mastic will,V
During the initial depressing of this be delivered to fill. the space" betweenthese boards and any depressions' 60 in the board surfaces, and at' the same time provide acrowned surface 52, on the delivered mastic. The pressure-regulatonLf 'may be adjusted to impart the desired curvature tothe troweled'. mastic.
Of course,- the length, of the handle section 27`may be extended, if desired;l to permit an operator to reach high i points on walls andceilings. Quite obviously, the masticfeeding mecl'xjanisrn M, and thetubula'r handle F, together' with its branch hoses and' fittings' 66, couldbe applied* to the toolj'slown in Figures 1 8. In this event, an end elevation` of' such a toolT would' be exactly the same asf that' shown in kFigure 9i ofthe drawings..
claimt.' ,Y 1'., In.a mastic-applying and surface-finishingtool of the character described: a tool body movable over a surface and having; a leading end and a trailing end; this body being provided with arecess adapted for receiving mastic; p the` recess having anoutlet" mouth opening toward the' surface when. the tool body placed against. the latterga movable plate disposed in this recess, andliaving a leading edge hinged tdthe leading, end ofthe body and'being i the stop, constituting a. lever for returning the plate into a retractedposi'tionaway fromQthe outlet mouth when depressing pressure on the plate i`s relaxedgjthe length of the: lever. cxistingfalongtlie leaf spring` from the inner end of the spring to'tljat portion that contacts with the stop,;
increasingv as the plate. is depressed, thereby rendering the- *i spring progressively'weaker., r
2.. Ina masticapplying andiinishing tool: a tool body movable overa surface and provided with a recess for lreceiving mastic.;the'recesshaving an outlet mouth openingtoward the surface when the tool body is placed The curvatureof the against the, latter; a s'wingable plate disposed in the recess f and? having leading and' trailing edges; means pivotally mounting the lcadingportin of the plate to the tool body for. swinging oftiie' plate toward" the surface toY thereby( eject mastic below the plate and through the outlet mouthV and against, the. surface asthe. tool body is advancedthereover;`the plate having a rear face; a handle swingably connected'. t`o the rear face of' the plate to extendA rear-f wardly therefrom; the handle being disposed entirelyto f the. rear. of7 tlie' tool, body and," spaced fromjthe surface for unobstructed; grasping. by. an. operator. for depressing thek o plate. as,- the. tool body is advanced' over the surface; and yieldingmeans;ccmnectedY only between the` plate and the; .y tool.` had? for returning the plate to retracted positionff away, fromme; outlet mouth when the depressingpressure on the platev istrelaxed; theV s wihgable connection betweenv the handle and plate permittingthe, plate to swing inthe body'without the handle swinging with the plate as a rigid unit.
3. In a mastic-applying and surface-finishing toolz'ia tool body movable over. a: surfacei and provided with a ,y
recess for receiving mastic;V the recess having an outlet mouth; opening toward the surface when the toolY body is placed Vagainst.the. latter;l aV swingably mounted'plate' disposed inv tljieV recess and being depressible to eject mastic against' the` surface as the toot body is advanced thereover; a handle` dimensioned tofbe grasped in one hand by an Operator; the plate having. a rear face;` said' handle tool body for returning the plate to retracted position away from the outlet mouth when the depressing pressure on the plate is relaxed; and a curved bracket xed to the plate to move therewith and positioned for engagement by an extended digit of the operators same hand; the swingable connection between the handle and plate permitting the plate to swing in the body without the handle swinging with the plate as a rigid unit.
UNITED STATES PATENTS Stevens June 24, 1879 Earth Aug. 12, 1884 Chappell June 8, 1915 Ashby Aug. 27, 1918 Ashby Sept. 14, 1920 Ames Nov. 10, 1942 Ames Mar. 2, 1948 Ames Oct. 16, 1951