US2681831A

US2681831A - Spray gun for fire apparatus and the like

Info

Publication number: US2681831A
Application number: US228626A
Authority: US
Inventors: Benjamin D Barton
Original assignee: AMERICAN FIRE APPARATUS CO
Current assignee: AMERICAN FIRE APPARATUS CO
Priority date: 1951-05-28
Filing date: 1951-05-28
Publication date: 1954-06-22
Anticipated expiration: 1971-06-22

Description

- INVENTOR.

A June 22, 1954 AR 2,681,831

SPRAY GUN FOR FIRE APPARATUS AND THE LIKE Filed ma 28, 1951 Jag/(M707 i. fla /0x;

Patented June 22, 1954 SPRAY GUN FOR FIRE APPARATUS AND THE LIKE Benjamin D. Barton, Battle Creek, Mich., as-

signor to American Fire Apparatus Company,

Battle Creek, Mich.

Application May 28, 1951, Serial No. 228,626

6 Claims.

This invention relates to improvements in spray guns for fire apparatus and the like.

The main objects of this invention are:

First, to provide a spray gun for fire apparatus and the like which is highly efficient in delivering a very fine spray or so called fog or mist and projecting it to a considerable distance, and other types of spray ranging therefrom to substantially a stream delivery.

Second, to provide a structure having these advantages which is very simple in its parts and easily regulated to control the delivery.

Further objects relating to details and economies of the invention will appear from the description to follow. The invention is defined and pointed out in the claims.

A preferred embodiment of the invention is il- .lustrated in the accompanying drawing, in which:

Fig. 1 is a side elevational view of a spray gun embodying my invention.

Fig. 2 is an enlarged fragmentary view mainly in longitudinal section on a line corresponding to line 22 of Figs. 1, and 6 with the valve in closed or seated position.

Fig. 3 is a fragmentary view partially in section corresponding to that of Fig. 2 with the valve partially open to mist forming discharge.

Fig. 4 is a fragmentary view partially in section of the valve fully open and the gun adapted to discharge a substantially solid stream.

Fig. 5 is a transverse section on a line corresponding to line 55 of Fig. 2.

Fig. 6 is a transverse section on a line corresponding to line 66 of Fig. 2.

Referring to the drawing, the tubular barrel I is provided with pistol type gri 2 constituting a supply conduit and having a suitable hose connection indicated at 3. The plunger rod l is controlled from the trigger-like lever 5 which is pivoted at 6. The operating connections for the lever to the plunger rod are not illustrated as they form no part of my present invention; however, suitable operating connections are illus trated in my co-pending application, Serial No. 31,547, filed June "7, 1948, now Pat. 2,621,076, granted December 9, 1952. i

The chambered head designated generally by the numeral 1 comprises a base or coupling portion 8 threaded upon the barrel I and externally threaded at 3 to receive the body portion II] of the head. The head is provided with a discharge port II and a rearwardlyfacing valve seat I2 surrounding the port. head is conical and merges into the valve seat.

The tip I4 is threaded upon a reduced portion The end wall I3 of the I5 of the head and has a central passage it opening to the port It. This tip in effect elongates the port II to more effectively direct the spray issuing from the port and it also serves as a guard or battering head for the end of the gun if it is desired to use the gun in battering an opening in a wall or the like.

The annular throat member I! is disposed in the chambered head, being supported between the inclined or conical wall portion I3 and the spider-like guide 18 for the throat restrictor I9 which is mounted on the plunger rod l. The base or coupling portion 3 of the head is disposed in end abutting engagement with the spider or guide member I3. This permits the assembling of the parts without other securing means than merely inserting the throat member followed by the guide member and threading the body memher i upon the base or coupling member 8. The throat member is provided with a plurality of spirally peripheral disposed grooves 213 which coact with the wall of the head in providing a plurality of small spiral passages 2I as is best shown in Fig. 5.

The valve 22 disposed in front of the restrictor is preferably tapered and is carried by the plunger rod l. The opening of the throat has a forwardly cylindrical portion 23 and a rearwardly expanding tapering or conical portion 2 5. The restrictor in the preferred embodiment illustrated has a forwardly tapered or conical portion 25 at its front end. When the valve is closed as shown in Fig. 2, the restrictor substantially closes the throat. The cylindrical portion of the throat is of such axial width that the throat is closed during a substantial range of adjustment of the valve and during this range of adjustment of the valve, the water or other liquid is discharged through the peripheral passages of the throat against the conical wall I3 with the result that a fine mist or spray is produced and discharged as such from the port I I. Further opening such as will bring the conical portion 25 of the restrictor into the throat provides controllable discharge of water, depending on the degree of opening through the throat and this varies the character of the spray until when the valve is fully opened and the restrictor entirely withdrawn from the throat, a substantially solid stream is discharged. The space between the throat member and the discharge port provides a discharge chamber into which the liquid discharged from the passages U is delivered with nates pockets which would tend to break up the swirling delivery of the spray as a so called fog, that is, a very fine spray. This arrangement of parts enables the control of the spray not only to conserve water but to avoid damage of merchandise and other objects such as is likely to result from the use of an excess of water. There are instances, however, where long range discharge is required, and the applicants structure provides for this as well as for varying degrees of fineness in the spray from the so called fog to a substantially solid stream.

I have illustrated and described my invention in a highly practical commercial embodiment. I have not attempted to illustrate various modifications and adaptations as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a structure of the class described, the combination of a barrel provided with a supply connection, a chambered head provided with a discharge port at its outer end and with a rearwardly facing conical valve seat surrounding the port, the end wall of the chamber being conical and merging into the conical valve seat, an annular throat member disposed in -said head and provided with a plurality of spirally disposed peripheral grooves, the throat member coacting with the walls of the head to provide a plurality of spiral passages openingto the head chamber at the rear of the throat and discharging against the said conical surface, said throat member having a cylindrical forward throat portion and a rearwardly flaring rear throat portion, a manually actuated plunger rod, a throat restrictor member actuated therewith and having a cylindrical portion movable into and out of said throat and acting to substantially close the throat when its cylindrical portion is within the throat, said restrictor member having a forwardly tapered portion in front of its said cylindrical portion for variably restricting the throat, a valve movable with saidrestrictor member and positioned relative to'the cylindrical portion thereof so that the throat is substantially closed during a substantial range of adjustment of the valve, said valve having a conical forward end portion seatingly en- 'gageable with said conical seat, the conical surfaces of said end wall, valve seat and valve facilitating a relatively large uninterrupted inward, forward, and spiral flow of water from the forward ends of said peripheral grooves to within said discharge port and forward said valve, and facilitating a relatively large straight forward flow of water from the throat into the discharge port and forward the valve, the range of adjustment of the restri tor member being such that it is entirely withdrawn from the throat when the valve is fully open, and a spider-like guide member disposed within said head chamber to coact with said restrictor member.

.2. In a structure of the class described, the

combination of a barrel provided with a supply connection, a chambered head provided with a discharge port at its outer end and with a rearwardly facing conical valve seat surrounding the port, the end wall of the chamber being conical and merging into the conical valve seat, an annular throat member disposed in said head and provided with a plurality of spirally disposed peripheral grooves, the throat member coacting with the walls ofthe head to provide a plurality of spiral passages opening to the head chamber ill at the rear of the throat and discharging against the said conical surface, a throat restrictor member actuated therewith and having a cylindrical portion movable into and out of said throat and acting to substantially close the throat when its cylindrical portion is within the throat, a valve movable with said restrictor member and positioned relative to the cylindrical portion thereof so that the throat is substantially closed during a substantial range of adjustment of the valve, said .valve having a conical forward end portion seatingly engageable with said conical seat, the conical surfaces of said end wall, valve seat and valve facilitating a relatively large uninterrupted inward, forward, and spiral flow of water from the forward ends of said peripheral grooves to within said discharge port and forward said valve, and facilitating a relatively large straight forward flow of water from the throat into the discharge port and forward the valve, the range of adjustment of the restrictor member being such that it is entirely withdrawn from the throat when the valve is fully open, and a spider-like guide member disposed within said head chamber to coact with said restrictor member.

3. In a structure of the class described, the combination of a barrel provided with a supply connection, a chambered head provided with a discharge port at its outer end and with a rearwardly facing conical valve seat surrounding the port, the end wall of the chamber being conical and merging into the conical valve seat, an annular throat member disposed in said head and provided with a plurality of spirally disposed peripheral grooves, the throat member coacting with the walls of the head to provide a plurality of spiral passages opening to the head chamber at the rear of the throat and discharging against the said conical surface, a manually actuated reciprocatingly mounted valve coacting with said valve seat, and a throat restrictor operatively associated with the valve for adjustment therewith and having a cylindrical portion which is positioned within the throat during a substantial range of adjustment of the valve and having a forwardly tapered portion of substantial axial length and acting to variably restrict the throat during a substantial range of adjustment of the valve, said valve having a conical forward end portion seatingly engageable with said conical seat, the

conical surfaces of said end wall, valve seat and valve facilitating a relatively large uninterrupted inward, forward, and spiral flow of water from the forward ends of said peripheral grooves to within said discharge port and forward said valve, and facilitating a relatively large straight forward flow of water from the throat into the discharge port and forward the valve, said restrictor member being entirely withdrawn from the throat when the valve is fully open.

4. In a structure of the class described, the combination of a barrel provided with a supply connection, a chambered head provided with a discharge port at its outer end and with a rearwardly facing conical valve seat surroundingthe port, the end wall of the chamber being conical and merging into the conical valve seat, an annular throat member disposed in said head and provided with a plurality of spirally disposed peripheral grooves, the throat member coacting with the walls of the head to provide a plurality of spiral passages opening to the head chamber at the rear of the throat and discharging against the said conical surface, a manually actuated reciprocatingly mounted valve coacting with said valve seat,

said valve having a conical forward end portion seatingly engageable with said conical seat, the conical surfaces of said end wall, valve seat and valve facilitating a relatively large uninterrupted inward, forward, and spiral flow of water from the forward ends of said peripheral grooves to within said discharge port and forward said valve, and facilitating a relatively large straight forward flow of water from the throat into the discharge port and forward the valve, and a throat restrictor operatively associated with the valve for adjustment therewith and having a cylindrical portion which is positioned within the throat during a substantial range of adjustment of the valve and having a forwardly tapered portion of substantial axial length and acting to variably restrict the throat during a substantial range of adjustment of the valve.

5. In a structure of the class described, the combination of a barrel provided with a supply connection, a chambered head provided with a discharge port at its outer end and with a rearwardly facing conical valve seat surrounding the port, the end wall of the chamber being conical and merging into the conical valve seat, an annular throat member disposed in said head and provided with a plurality of spirally disposed peripheral passages discharging against the said conical surface, a manually actuated reciprocatingly mounted valve coacting with said valve seat, said valve having a conical forward end portion seatingly engageable with said conical seat, the conical surfaces of said end wall, valve seat and valve facilitating a relatively large uninterrupted inward, forward, and spiral flow of water from the forward ends of said peripheral grooves to within said discharge port and forward said valve, and facilitating a relatively large straight forward flow of Water from the throat into the discharge port and forward the valve, and a throat restrictor operatively associated with the valve for adjustment therewith and having a cylindrical portion which is positioned within the throat during a substantial range of adjustment of the valve and having a forwardly tapered pcrtion of substantial axial length and acting to variably restrict the throat during a substantial range of adjustment of the valve.

6. In a structure of the class described, the combination of a barrel provided with a supply connection, a chambered head provided with a discharge port at its outer end and with a rearwardly facing conical valve seat, the end wall of the chamber being conical and merging into the conical valve seat, a throat member disposed in said hea throat member having a central throat opening and with a plurality of spirally disposed passages disposed radially outward from and independent of said throat opening and opening to the head chamber at the rear of the throat member and discharging against the said conical surface, an adjustable throat restrictor member having an elongated throat closing portion movable into and out of said throat, and a valve movable with said restrictor member and positioned relative to the throat closing portion thereof so that the throat is closed during a substantial range of adjustment of the valve, said valve having a conical forward end portion seatingly engageable with said conical valve seat, the conical surfaces of said end wall, valve seat and valve facilitating a relatively large, uninte rupted, inward, forward and spiral flow of water from the forward ends of said spirally disposed passages to within said discharge port and forward said valve, and. facilitating a relatively large straight forward flow of water from said throat into the discharge port and forward the valve.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,253,245 Hull Jan. 15, 1918 2,213,928 Gold et al Sept. 3, 1940 2,520,824 Barton Aug. 29, 1950