US2032789A - Spray gun for asphalt or the like - Google Patents

Description

'March 3, 1936. s. BRAMSEN 2,032,789

S PRAY GUN FOR ASPHALT OR THE LIKE Filed May 4, 1935 2 Sheets-Sheet l 6 Hlllllll i 1!!" f ve/ 60k.

cf/eqd E mx q March 3, 1936.

s. BRAMSEN 2,032,789

SPRAY GUN FOR ASPHALT OR THE LIKE Filed May 4, 1935 2 Sheets-Sheet 2 Patented Mar. 3, 1936 SPRAY GUN FOR ASPHALT on 'rnnLrxE Svend Bramsen, Chicago, 111., assignor toBinks Manufacturing Company, Chicago, 111., a corporation of Delaware Application May 4, 1935, Serial No. 19,7'79

7 Claims.

or tar roof-coating materials. In general, the objects of my of providing a simple, durable,

invention are those easily operable and easily cleanable spray appliance of this class which will not be clogged by the drying of liquid material in it, which will operate with a relatively low air pressure in proporti on to the specific gravity of the material and to the rate at which this is to be sprayed, and which can readily be constructed in the form of a spray gun.

More particularly my invention aims to provide an appliance of this class having the following advantageous characteristics:

(1) A straight passageway for the material through the appliance, to reduce the required air pressure and to facilitate a cleaning of the appliance; also, a generally str way through the appliance.

aight air passage- (2) A simple and positively actuating mechanism whereby a single and conveniently disposed handle will simultaneously actuate a material control valve and an air control valve in such timed relation to each other always opens firstand closes that the air valve last.

(3) An arrangement of this mechanism will readilypermit all parts thereof, as well as the valve-actuating mechanism, to be removed and detached from one another manually, after detaching a lateral cover plate.

' (4 An arrangement whereby simple formations on this detachable cover plate positively limit the movement of the valve-actuating handle to the two extreme positions in which the flow of bothmaterial and air is either full open or entirely shut oil.

(5) An arrangement whereby two springs,

interposed between respectively the cover plate and the two gears, simultaneously insure a firm v seating of both valves, and whereby the resulting friction normally holds both 'justed position.

Illustrative of the manner plish the above, objects,

- Fig. 1 is a full-sized side elevation of an asphaltinvention, ,showing'... A. this as equipped with nozzles for projecting a ,50 spray of circular cross-section, with portions of spraying-gun embodying. my

valves in any ad-' in which I accom- A anair supply hose and a material supply .hose shown in dotted lines.

Fig. 21s a front elevation of of the same spray gun.

' Fig.3 is a fragmentary sec the upper portions tion along the line which the. material nozzle an exterior thread i coaxial with the said nozzle,

3 3 of Fig. 2, showing the interengaging stop elements on the detachable side plate and the handled actuating member.

Fig. 4 is a vertical and longitudinal section taken along the line 5-4 of Fig. 2, with both the 5 material valve and the air valve in their fully closed positions.

Fig. 5 is a section allied to Fig. 4, showing how the air valve is already partly open when the material valve is just about to open.

Fig. -6 is a section also allied to Fig. 4, showing the full open positions of both valves.

Fig. 7 is a transverse vertical section through the same spray gun, taken along the line T--'i of F 1- 15 Fig. 8 is a section allied to the left-hand end portion of Fig. 4, showing another type of discharge nozzle.

Fig. 9 is a front elevation of the discharge nozzle shown in Fig. 8.

Fig. 10 is a view showing the upper portion of the handled member and the parts associated with the latter, as these parts may appear during the' assembling of my spray gun. Y

In the illustrated spray gun, the gun body I 25 has an integral gun handle 2 depending from it, and has an axially straight bore 3 extending entirely throughthis body. An inlet nipple 4 is threadedinto the rear end, and a materialdischarge nozzle 5 into the forward end of this 30 bore 3, thereby affording a straight passage for material from a hose -6 attached tothe inlet nipple d.

The forward portion la of the gun body, into 5-is threaded, has 35 and also has its frontal face provided with a groove 8; and the discharge nozzle 5 has a pcripheral flange 5a disposed in front of this groove this flange being provided with circumferentially 4 distributed longitudinal air passages 9, Detachably fitted on the said thread 1 is a retainer ring Ill-which clamps a discharge nozzle H against the radially outer portion of the flange 5a on the material nozzle while leaving the frontal por- 4 tion of the said discharge nozzle freely spaced from the material .nozzle. Moreover, the dis-'- charge nozzle H preferably extends considerably forward .beyond the tip of the material nozzle 5, so that air flowing fromthe passage 9 through. 6 0

arrow line A in Fig. 4. Y 55 expose'an annular shoulder I80, as shown in In addition to the aforesaid straight passageway 3 for the material, the gun body also has a generally straight longitudinal air passage l2 through which compressed air can-flow from an air hose l3 (attached to the rear end of the gun body by a nipple H) to the groove 8 in the front end of the gun body, for distribution by that groove to the several air passages 9 in the material nozzle.

Extending through the gun body, transversely of the plane in which the section of Fig. 4 was taken, are two bores I5 and I6 (Fig. 5) both of which lead from the upright bottom i M oi a lateral recess l in the-gun body as shown in Fig. 7. Both of these bores taper away from that recess and open at-the other side of the gun body to facilitate themaking of these bores, and these a transverse bores have their axes respectively in-' tersecting the axes of the air passage I2 and the material passage 3'.

Seated in, and fitting the upper transverse. bore I5 is a tapering valve I 8 which has a cross-bore I80 corresponding in diameter to that of the .air-passageiZ, this cross-bore being disposed so that it will substantially aline'with the said air passage. (as in Fig. 6) when the said; air valve is in its full open position. The valve member l8 has an axial stem lab extending into the recess I! of the gun body for only part of the depth of .that recess-this stem being of considerably smaller diameter than the adjacent end of .the-

main portion of the said valve member, so as to Fig. 7.

Normally bearing against the said shoulder 18c is an upper gear IS, the bore of wh1ch slidably I fits the said stem [8b, and which bore has opposed enlargements E-. (Fig. 1) .normallyhousing the two end portions of a cross-pin 20 extendingtransversely through the said stem to afford a the air-controlling valve '18;

The companion tapering valve 2| normally splined connection between the upper gear and seats in and fits the lower transverse bore l6,

oi the gun body, and this (material-controlling) valve has across-bore 2|a corresponding in diameter ,to that of the adjacent portion of thematerial passage 3, as in Fig. '6. This valve 2l is desirably formed 'as an integral part of a handle member which includes a shank 24 extending through the'body recess [1, the said shank being adJoined to the said valve member by an annular shoulder 3| against which a lower gear 22 normally bears. The .said lower gear having its bore provided with opposed enlargements e 1 (Fig. 1) which normally house the end portionspf a cross-pin 22 extending through the shank', to aflord a splined connection between this lower gear 22 and the'material-control valve 2|.

In addition, the handled member includes a handle 25 extending treely through a bore 26a which normally recess, which plate in a detachable side :plate 28 closes the mouth bf the said is fastened to, the'gun body by screws 21, -Pro.-, jecting radially from the shank 24 of thehandled member is astop pin 20 which extends into-an arcuate enlargement 26b of the said bore in the lic'and 134111 18. 3)

sideplate, this bore enlargementhaving itsends said stop pin when fbothrvalve members are respectively in their full .open" position or Pig. 6.

vand intheir closed position of Fig; 4. 4

' respectively between the side plate- "and the said two s ats. are twooompression springs, 8 and each oi' which efle'ctively presses for e the than 'the other spring, and a washer 29 as de' sirably interposed between the, said stronger spring S and the detachable sideplate. 26.

Illustrative of the assembling of my spray gun,

the air-controlling valve member l8 may first be slipped through the body recess l1- into the upper transverse bore l5 and turned to the full open posit-ion of Fig. 6, which position can be sighted from the. rear end of the air passage before the air nipple I4 is attached to the gun body,

after which the upper gear I9 can be slipped over the handled member to interlock'it with the crosspin 20 of Fig. 7. v

The valve end of the handled member is then slid successively through the perforation 26a in the side plate 26, the washer 29, the stronger spring S and the gear 22 to form a loose assemblage, as in Fig. 7. In this temporary assembly; the valve 2| projects freely beyond'the other just recited parts, so that this can readily be of the body and turned so that the cross-bore -2 la of that valve alines with the material passage 3, this alinement being easily determined by looking through the said passage. The other parts shown in Fig. 10 can then be consecutively slid a'o inserted in the lower transverse bore I6 (Fig. 6) l into their normal positions of Fig. 7, after which the-fastening of the side plate 26 to the gun body by the screws 21, together with the attaching of the'two inlet nipples 6 and I2 and of the-two nozzles completes the assembly.

With the cross-pins 20 and 2-3, the stop pin 28 on the handled member, and the'stop shoulders 26c and 26d on the side plate suitably-located with respect to one another and to the relative directions of the axes of the two passages in the gun body, I obtain the following advantageous effect:

When the handled member is moved in a.

counterclockwise direction in Fig. 1, the material controlvalve 2l rotates in the same direction, a and' the intermeshing of the two gears l9 and 22 rotates the air control valve in a clockwise direction, as indicated for both by thearrowsin Fig. i. With the aforesaid suitable relative position, the

air valve It opens (as in Fig.5) before the ma- Consequently,

terial .valve 2! begins to open. when the gun begins to operate, it .at first emits air ,only, and the sweep of. thisair along the .bore Ila of the air nozzle prevents the material (if sticky) from adhering to this bore when the] handle is movedfurther (in the valve opening as in Fig. 6. v

'Likewise, when the handled member is movedin the opposite direction after my spray-gun has been used the two valves at first rotate from the full open? position of Fig, 6 to the intermediate direction) so as to open the material valve also,

position of Fig. 5 in which the flow of material is shut oil. But air then -still flows through the cross-bore 18a of the air nozzle, thereby eifecting such a forward suction in the'tip of the material. nozzle I as to draw residual material out of that tip for-ejection by the continued flow oi" Consequently, avoid the seriouaclogging of the material nozzle by the ying of material the nozzle ll of Fig. 4.

bore a, of the material nozzle.

3 and the material nozzle 5 for speedily and completely cleaning these as well as the cross-bore 2 In. of the material nozzle. So also, it will be evident from'my previousdescription of the assembling I that my spray gun can easily be entirely disassembled for inspecting and cleaning all parts thereof, and likewise thereafter reassembled, the only tool required being a simple screw-driver.

This automatic cleaning of the air nozzle during the shutting off of my spray gun is all the more advantageous when the discharge nozzle has its discharge orifice formed for flattening the emitted spray of material, as for example when the discharge nozzle 30 of Figs. 8 and 9 is substituted for In this slitted orifice" type of nozzle 30, the discharge outlet is a slot 300., which slot is desirably of greater length and smaller width than the diameter of the outlet the discharge nozzle presents two shoulders 30b forwardly of the materialnozzle, which shoulders deflect air toward the axis of the material stream and also would have material deposit on them if the flow of air was not continued (in the above described manner) after the flow of material has been shut ofi. In practice, the user of my here presented sun soon learns that by first halting the closing movement of the handle in an incompletely closed position (as indicated by dotted line 7 25b in Fig. 1) for a brief time, he can efiectively cause residual material to'be sucked out of the material nozzle, and he can easily determine the needed position of the handle by noting when the ejection of material has'nearly ceased.

However, while I have described my here pre-' sented spray gun in connection with illustrations of a hand-held type, I do not'wish to be limited ,in this respect, or with respect to other here deto denote the gun body togetherwith the recess cover fastened to that body.

I claim as my invention:

1. A material spraying appliance comprising a body member provided with a longitudinal material passage and a longitudinal air passage, both of which passages open at theiorward end of the body member; the body member also having two parallel transverse bores each crossed by one 'of the said passages; two axially parallel valve members respectively disposed within and rotatable' in the said two bores; two intermeshed gears respectively coaxial with and interlockw with the two valve members; and an actuating member fast with respect to one of the valve members and presenting a handle portion outside I the body member; the. body member includinga body having a recess through the bottom of which member including an axial stem extending into' both of the transverse bores open, and each valve Thus formed,

I mally closing the mouth of the said recess, and

two compressible. elements respectively interposed between the cover member and the two gears.

2.'A'material spraying appliance comprising a body member provided with a longitudinal material passage and a longitudinal air passage, both of which passages open at the forward end of the body member; the body member also having two parallel transverse bores each crossed by one of the said passages; two axially parallel valve members respectively disposed within and rotatable in the-said two bores; two intermeshing gears respectively coaxial with and interlocking with the two valve members; and an actuating membody member; the body member having a recess through the bottom of which both of the trans:

verse bores open, and each valve member including an axial stem extending into the said recess, both of the said gears being disposed in the said recess and each gear being splined to one of the said stems; the appliance including also a detachable cover member normally closing the mouth of the said recess, and two compressible spiral springs respectively interposed between the cover member and the two gears; each stem having at least a portion thereof disposed within a portion of the adjacent spring for approximately centering the spring with respect to the axis of the stem.

3. A material spraying device adapted to be supported by the hand of its user, comprising a metal body including an upper portion through which two superposed and generally horizontal passages extend, the said passages presenting their outlets adjacent to each other at the forward end of the body; the body having a recess in one side thereof and'having two transverse bores extending respectively across the said two passages and both opening at the other side of the body; two valves respectively rotatably disposed in the two transverse bores, each of the valves tapering away from, the said recess and having a stem extending into the said recess; two intermeshed gears disposed within the said recess and respectively splined to the stems of the two valves; a side plate detachably fastened to the side 01 the body at which therecess opens and normally closing the mouth of the said recess, the side plate having an aperture coaxial with the one of the said valves; annular yielding means interposed between the side plate and the gear adjacent to the last name-d valve; and a handle fast with respect to the last named stem and presenting its manually actuable portion outside the said body and side plate. I I d. A material spraying device as per claim 3, in which the aperture in the side plate has an enlargement presenting two shoulders spaced circumferentially of the said aperture, the appliance including a stop pin projecting from the stem of the last named valve and adapted to be engaged by the said shoulders; whereby the stop pin and shoulders cooperate for limiting the rotational movement of the said valves in both directions. a

5. A material spraying device as per claim 3, in which the bores of the said yielding means, of the gear adjacent to the latter, and of the aperture in the side plate are all of larger diameter than all portions of the handle; so as to permit the last named gear, the yielding means and the side plate to be slid over the free end of the handle and into their operative positions after the valve attached to the handle has been body. W

ber comprising a main body part provided with two longitudinal passages and having two cross- .bo'res respectively intercepting the said passages,

and a second body part detachably fastened to the main body part; the two body parts being formed for affording a chamber from which the said cross-bores lead, and the second body part having a perforation in axial alinement with-one.

' l of the said cross-bores; and each cross-bore tapering away from the said chamber; two passage control members each including a tapering valve rotatably disposed in one of the cross-bores and a stem coaxial with the valve and disposed within the said chamber; two intermeshed gears disposed within the said chamber and respectively splined to the two valve stems; and an actuating member including a handle disposed outwardly of the second body part and a portion extending through the said perforation and connected'to one of the valve stems. a

'7.- A spraying device as per claim 6, in which each valve presents a shoulder at the juncture of the valve with the corresponding stem, against which shoulders the gears splined to the said stems respectively bear; and in which the appliance includes compression spring means interposed between the said gears and the second body part and continually pressing the gears in the direction'in which the valves and cross-bores taper, whereby the spring means cause the gears to socket the two valves firmly in theirvrespec- -tive bores.-

SVEND BR MSEN.

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