US1736768A - Gun for blowing asphalt and the like - Google Patents

Description

Nov. 2%, 1929. c. D. BOYNTON GUN FOR BLOWING ASPHALT AND THE LIKE Filed July 3, 192

7 N y 7 1 l N My ATTORNEY UNITED STATES PATENT OFFICE CABLE D. BOYNTON, OF JOPLIN, MISSOURI GUN FOR BLOWING ASPHALT AND THE LIKE Application filed July 3, 1926. Serial No. 120,286.

The invention relates to devices for blow- Fig. 2 is a transverse section taken on the mg by means of air, liquid substances as, for lme 22 of Fig. 1; and instance, asphalt or other material suspend- Fig. 3 is an end view looking into the front ed in a liquid, for the purpose of coating a end of the nozzle.

desired surface with such substances, or for In the following description and in the 55 any other purpose. These devices are genclaims parts will be identified by specific erally known as air guns. names for convenience, but they are intended According to the invention an air gun may to be as generic in their application to simibe provided which may comprise a barrel of lar parts as the art will permit.

suitable length having at its front end a Referring now to the drawing, the air gun 0 nozzle member. The nozzle member may be may comprise a barrel 1 of suitable length provided with a recess having a seat for a which may be made up of a longitudinal pipe needle valve and a nozzle cavity connecting m m er 2 h v ng a T-fi ting 3 at its rear with said recess. An air chamber may sur end Into the lower opening of the T-fitting round the recess and cavity, the air chama handle member 4 may be provided, the her having by-pass holes extendin to the handle member being in the form of a pipe needle valve recess and multiple holes extendand communicating with the interior of the ingto the nozzle cavit Suitable connecting barrel. Threaded into the rear end of the devices may be provi ed for feeding the subng 3 may be a fiing b X 5 haVlIlg an 20 stance to be blown from the gun into the baropening thZOHgll which the spindle 6 Of the rel, and additional devices may be provided needle valve 7 may pass, the stufling box 5 for supplying the air chamber with air under being provided with a gland member 8 and suitable pressure. packing 9 for efiectively sealing the spindle The provision of th by-pas hol llow against the escape of the liquid material.

25 the air to be. mixed with the liquid material Pivo ed 0 the h n le member 4 may be a before it enters the nozzle, thereby agitating valve lever 10 having a lower hand engaging the liquid material at this point and insuring portion 12, and an upper portion 13 provided proper and continuous action. The proviwith a hole through which the spindle 6 may sion of the multiple holes leading to the nozpass loosely- L Ck nu s 14 may be provided so zle cavity tears the material stream up and 011 the p n On either Side Of the pp r blows the particles effectively onto the surportion. A. leaf spring member 15 may be face to be coated. Both the multiple holes RrOVlded w n h hand engaging porand by-pass holes may be r d so as t tion 12 and the handle member to normally g; up a i li ti th li id t urge the needle valve 7 against its seat.

:55 i l At the forward end of the barrel 1 a nozzle 45 claimed.

Various other objects and advantages of member 16 may be Rrovlded- The nozzle the invention will be obvious from the folmember CODEIPIISQ reduced threaded lowing particular description of one form of fi g 1 i y be thregded Into device embodying the invention or from an t {if 3 i 1P8 5 0 inspection of the accompanying drawings; a ff er d S? e 9 and the invention also consists in certain new 0 n O E e Orwar en 0 e plpe mem er and novel features of construction and combi- 2 to act as a gulde for the needle Valve The nozzle member 16 may be provided at natlons of Parts heremafier set forth and its rear end with a recess 19 having a conical seat 20 for seating the needle valve 7 and at Referrmg W to the r g Wh10h a its front end a conical nozzle cavity 22, there single modificatlon of the inventlon 1s shown b i an ni g on cti g id recess d for purpose of illustration only: cavit The nozzle member may further be Fig. 1 1s a longltudmal elevation partly in provided with an annular air chamber 23 0 section of the air gun; surrounding the opening, the annular air chamber having connecting therewith a plurality of by-pass holes 24, the by-pass holes intersecting the recess 19 substantially midway the length thereof and tangentially for a purpose hereinafter described more in detail. These by-pass holes 24 may be formed by drilling holes from the outside of the nozzle member 16, these holes crossing the annular air chamber 23 and intersecting the recess 19 substantially tangentially thereof. The part of the holes between the air chamber 23 and the outside of the nozzle member may be plugged up by the plugs 33. Similarly, a plurality of multiple holes 25 may be provided connecting with the air chamber 23 and intersecting the nozzle cavity 22 substantially midway its length and tangentially for a purpose hereinafter described.

The nozzle member may be provided with 3. depending tube 26 connectin with the air chamber to which may be suita ly secured an air pipe 27 which may extend along the barrel and handle, being secured thereto by means of straps 28. An air valve 29 may be provided in the, air line for controlling the air flow. The lower ends of the handle member 4 and air pipe 27 may be provided with suitable connecting devices such as screw threads 31 and 32 for connecting feed pipes (not shown) leading to suitable tanks (not shown) containing the liquid material and air re spectively.

The provision of the air chamber and bypass holes allows air to be mixed with the liquid substance before it enters the nozzle. The air bein under a higher pressure than the liquid su stance will agitate the liquid substance and the tangential location of the bypass holes 24 will give it a swirling motion, thereby insuring proper and continuous operation of the gun. Also the tangential multi le holes 25 extending from the air chain er 23 to the nozzle cavity 22 cause the mixture of the air and liquid material to be torn and broken up and the particles to be effectively spread out.

In operation the pressure on the liquid substance in the tank may be from 15 to 30 pounds depending upon the lift, the material and the distance between the gun and the tank. The air pressure may be from to 100 pounds to give proper operation. The by-pass holes 2 1 are sufficiently small so that the relatively higher air pressure does not cause a back pressure to be built up against the entering liquid substance which will interfere with the proper operation. If desired, instead of having the auxiliary valve on the air line a valve may be provided which will control both the air and the flow of the liquid substance simultaneously. A valve on the air line is preferable, however, because at times it is desirable to blow the liquid material straight through without the use of air at the nozzle. It is obvious that the nozzle member is detachable and may be replaced by nozzles of different dimensions, if desirable, for different purposes.

Thus it will be seen that an air gun is provided which is simple in construction, inexpensive to manufacture, and eflicient in operation. The liquid material is mixed with the air by by-passing part of the air before it is fed to the nozzle cavity. This by-passing of the air effectively agitates and mixes with the liquid material before it enters the nozzle, thereby insuring proper and continuous operation. The provision of the tangential multiple holes causes the liquid substance to be broken up into particles and to be properly spread throughout the desired area.

While I have shown and described and have pointed out in the annexed claims certain novel features of the invention, it will be understood that various omissions, substitutions and changes in the forms and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention.

Having thus described my invention, 1 claim:

1. An article of the class described comprising a hollow barrel adapted to have supplied thereto a fluid substances it is desiredto discharge, a nozzle member connected to said barrel at the front end thereof, said nozzle member having a nozzle opening, said nozzle member also having an auxiliary fluid chamber, an auxiliary fluid conduit communicating with said chamber, a by-pass hole connecting with said chamber and the back end of said opening, a second hole connecting with said chamber and the front end of said opening, and a valve for simultaneously blocking said nozzle opening and one of said holes.

2. An article of the class described comprising a hollow barrel adapted to have supplied thereto a fluid substance it is desired to discharge, a nozzle member connected to said barrel, said nozzle member having a cavity in its front, a recess with a seat in its back end and an opening connecting said recess and cavity, said nozzle member also having an auxiliary chamber, an auxiliary conduit communicating with said chamber, a by-pass hole connecting with said chamber and said recess, a multiple hole connecting with said chamber and said cavity, a needle valve to seat in said seat, and means for controlling the position of said valve, said valve being adapted to simultaneously block said opening and by-pass hole. 2

3. An air gun comprising a hollow barrel having at the rear end thereof a handle and adapted to have supplied thereto a fluid substance it is desired to discharge, a nozzle member connected to said barrel at the front end thereof, said nozzle member having a conical cavity in its front, a recess with a conical seat in its back end and an opening connecting said recess and cavity, said nozzle member also having an annular chamber surrounding said opening, an air pipe com municat-ing with said chamber and an air valve, a plurality of by-pass holes connecting with said chamber and intersecting said recess tangentially, a plurality of multiple holes connecting with said chamber and intersecting said cavity tangentially thereof, a needle valve having a conical portion to seat in said seat and a spindle extendin through the rear end of said barrel, and a oted to said handle and spindle.

4. An air gun comprising a hollow barrel having at the rear end thereof a hollow handle communicating therewith, said hollow handlebeing adapted to have supplied thereto a. fluid substance it is desired to discharge,

a nozzle member having threaded connection with said barrel at the front end thereof, said nozzle member having a conical cavity in its front, a recess with a conical seat in its back end and an opening connecting said recess and cavity, said nozzle member also having an annular air chamber surrounding said opening, an air pipe communicating with said chamber and an air valve at said handle, a plurality of by-pass holes connecting with said chamber and intersecting said recess tangentially midway the length of said seat, a plurality of multiple holes connecting with said chamber and intersecting said cavity tangentially thereof midway its length, a needle valve having a conical portion to seat in said seat and a spindle extending through the rear end of said barrel, and a lever pivotally connected to said handle and spindle.

5. A coating gun comprising a nozzle member having a restricted nozzle opening with a front enlarged cavitv and a back enlarged cavity, a source of fluid coating sub-v stance connected to said back cavity, a source of auxiliary carrier fluid connected to said front cavity by first passages and to said back cavity by small second passages so that no appreciable back pressure can be built up against said coating substance, said first and second passages being arranged to impart a whirling motion to said coatin substance.

In testimony whereof I have ereunto set my hand.

CABLE D. BOYNTON.

lever piv-

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