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Publication numberUS1755329 A
Publication typeGrant
Publication dateApr 22, 1930
Filing dateMar 14, 1927
Priority dateMar 14, 1927
Publication numberUS 1755329 A, US 1755329A, US-A-1755329, US1755329 A, US1755329A
InventorsMccormack Lawrence E
Original AssigneeMccormack Lawrence E
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pneumatic gun for applying mortar
US 1755329 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

April 22, 1930. L. E. MccoRMAcK 1,755,329

I PNEUMATIC GUN FOR APPLYING MORTAR Filed March 14, 1927 INVENTOR ,l T ATTORNEY v Aamag {Ala dbl/21M Patented Apr. 22, 1930 LAWRENCE E. MCCORMACK, F SEATTLE, WASHINGTON PNEUMATIC GUN FOR APPLYING MORTAR Application filed March 14, 1927. Serial No. 175.040.

My invention relates to improvements in apparatusof the form hereinafter termed a mortar gun, which is adapted for applying plastic mortar to walls, and the object of my invention is to provide portable pneumatic apparatus of simple and eflicient con struction that is capable of handling -wet mortar and of depositing said wet mortar in an even layer'of any desired thickness on any wall or surface to which it is desired to apply said mortar.

A further object is to provide a mortar gun of this nature in which the mortar is carried in a portable container and the nozzle forspraying' said mortar is attached directly to the bottom of said container thereby providing an arrangement in which the feed of the mortar is assisted by gravity and in which all hose and like conduits with the exception of a single air line are eliminated.

Another object is to provide a mortar gun in which" several abrupt shoulders and changes of area are afi'orded in the nozzle preventing a separation of the ingredients of the mortar and insuring a further mixing of the same. 7

A further object of the invention is to pro vide a nozzle of simple and efficient construction which is made up, for the most part, of

standard pipe-fittings and in which the parts may be readily removed for the purpose of cleaning and replacement.

A further object is to provide a mortar gun of this nature that may be readily carried and handled by one man and that may be conveniently re-loaded with mortar at frequent intervals when in operation.

Other and more specific objects will be ap- P parent from the following description taken connection with the accompanying drawmgs. r

In the drawings Fig. 1 is a view in side elevation of a portable pneumatic mortar applying device constructed in accordance 5 with my invention. I

Fig. 2 is a plan view ofthe same. Fig. 3 is a View in vertical mid section of the same on a larger scale.

Fig. 4 shows a modified form of nozzle for so applying thin mortars.

Fig. 5 is a fragmentary elevation of a modification of the invention in which a valve is interposed between the container and the nozzle.

In the handling of mortar in a plastic state after it is mixed with water I find that it is not practical to conduct said mortar through hose or pipes for any substantial distance but that it is necessary to deliver the mortar directly from a container to the nozzle in order to 'get a smooth and even discharge of mortar of the proper consistency to keep the ingredients of the mortar from separating, and to handle the mortar with a minimum air pressure and without clogging the passageways in and to the nozzle. The present invention accomplishes this purpose in a simple and efficient manner and enables me to handle mortar of the consistency ordinarily applied with a trowel, or thinner 7 if desired, by pneumatic means.

Referring to the drawings, throughout which like reference numerals designate like parts, 6 designates a mortar receptacle, preferably of conical shape. The receptacle 6 is provided on two opposite sides with handles 7 and is provided on-a side at right angles to said handles 7 with a body rest 8 that is adapted to be placed against the body of the person that is carrying and using the device. 30

The bottom end of the receptacle 6 terminates in a discharge opening 10 that is connected by a bushing 11 and nipple 12 with a T fitting 13. One end of the T fitting 13- is connected by a nipple 14 with a con- Vergent discharge fittin 15, which is, in turn, connected with a cylin rical discharge niple 23 the discharge end of which is flattened as at 25. The several fittings and reducers of which the discharge part of the nozzle is made up serve to hold the mortar back and agitate the same mixing the mortar more thoroughly and preventing the water from separating from the mortar. The other end of the T fitting 13 is connected by suitable reducers 16 with an air inlet pipe 17 which connects with an air hose 18 that may be connected With a suitable source of supply of air under pressure. 20 is an in'ector tube disposed axially within the" T fittmg 13 and having an enlarged head 21 that is screwed into the innermost reducer member 16 and jammed tightly against the end of the air inlet pipe 17. The injector tube 20 is preferably smaller than the pipe 17 and is necessarily much smaller than the T fitting 13 and the outer or discharge end of said tube terminates within the .nipple 14. An annular space 22 is left between the outer walls of the injectortube 20 and the inner walls of the T fitting 13 and nipple 14 through which mortar may .be drawn by suction as indicated by the arrows in Fig. 3. The outer end of the convergent nozzle 23 is flattened as at 25 to spread the discharging mortar.

In Fig. 4 I have shown a discharge nipple 26 as provided on its outer end with a second reducer member 27 of cylindrical shape and internally threaded to impart a whirling motion to the discharging mortar thereby giving a peculiar finish to a wall. This form of nozzle is for use in putting on finishing coats of relatively thin mortar.

In the form shown in Fig. 5 I have shown a valve 24 interposed between the receptacle 6 and the nozzle member to regulate or entirely shut off the discharge of material from the receptacle 6. For mortar of ordinary consistency the valve 24 is not-needed.

In the operation of this device the mortar, thoroughly mixed and ready for application to a wall, is placed in the receptacle 6, said receptacle preferably being large enough to hold an ordinary'pail full of such mortar. The operator graspsthe handles 7, letting the member 8 rest against his body, directs the nozzle toward the .wall to which mortar is to be applied and admits air under pressure through the hose 18. Said air issuing from the injector tube 20 at high velocity produces a suction in the fittingv l3 and nipple 14 which draws mortar from the receptacle 6 down through the opening 10 and sprays said mortar from the end of the nozzle 23. The mortar being driven with considerable force against the wall to which it is being applied may be driven into all of the minute openings in such wall leaving said mortar in very compact form andcausing it to adhere very tightly to the wall. I find that mortar applied in this way adheres much more tightly to the wall, has a greater density, is freer from air spaces, in less liable to crack and is more impervious to moisture than the same mortar applied in the usual way with a trowel. The mortar may also be applied a great deal more rapidly in this Way than with a trowel giving the mortar a better opportunity to set evenly making it possible to use a quick setting mortar and saving much time and labor. The nozzle tip 23 being flattened on the end as at 25 tends to spread the mortar in a fan like sheet rather than in a true cone so that when the nozzle is moved up and down the mortar is deposited very evenly. The nozzle 23 of reduced area and the abrupt shoulders formed by the sevformed by the rear end of the nipple 14 just back of the discharge opening of the injector tube 20 is especially useful in distributing the mortar and producing an even fiow of the same. i

The foregoing description and accompanying drawings clearly disclose a preferred embodiment of my invention but it will be understood that this disclosure is merely illustrative and that such changes in the invention may be made as are fairly within the scope and spirit of the following claims.

I claim:

1. In a pneumatic mortar gun, a receptacle having a discharge opening in the bottom end and convergent toward said discharge opening, a T fitting connected with said bottom and forming a passageway crosswise of said discharge opening and communicating therewith, discharge nozzle means connected with one end of said T fitting, and aflording 'an abrupt annular shoulder within said T fitting, a reducer fitting at the other end of said T fitting, pressure inlet conduit means connected with said reducer fitting, and a relatively small injector tube disposed axially within said T fitting and supported by said reducer fitting and communicating with said pressure inlet conduit means, the discharge end of said injector tube extending beyond the inlet opening to said receptacle and terminating just beyond said abrupt annular shoulder.

2. In aportable pneumatic mortar gun, a funnel shaped receptacle, a T fitting extending crosswise of the bottom end of said receptacle and communicating therewith, a short nipple connected with one end of said T fitting and forming an abrupt annular I shoulder within said T fitting, a convergent pipe reducer connected with said nipple, a discharge nozzle connected with said convergent reducer and affording at its inner .end an abrupt shoulder, said nozzle being flattened on its discharge end to spread mortar horizontally in fan shape, pipe reducer fittings in the other end of said T fitting and a relatively small injector tube arranged axially of the T fitting and supported by the I reducers and terminating within said nipple for discharging air under pressure through said nozzle, said fittings affording abrupt shoulders for agitation of the mortar to prevent a separation of the solid matter and water.

The foregoing specification signed at Seattle, VVash., this 24 day of Feb, 1927.


Referenced by
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U.S. Classification239/654, 366/11, 406/144, 239/398, 239/379
International ClassificationE04F21/12, E04F21/02
Cooperative ClassificationE04F21/12
European ClassificationE04F21/12