US1660359A

US1660359A - Paint gun

Info

Publication number: US1660359A
Application number: US22068A
Authority: US
Inventors: Frederick W Schneider
Original assignee: Pittsburgh Plate Glass Co
Current assignee: PPG Industries Inc
Priority date: 1925-04-10
Filing date: 1925-04-10
Publication date: 1928-02-28
Anticipated expiration: 1945-02-28

Description

Feb. 2s, 192s.

F. W. SCHNEIDER PAINT GUN 2 Sheets-.Sheeu 2 Filed April 1o, 1925 O 7 w 3 W j ,we u

INVENTO Patented F eb. 28, 1928.

aureo srATE-s PATENT OFFICE.

FREDERICK W. SCHNEIDER, OF BALTIMORE, MARYLAND', ASSIGNOR TO PITTSBURGH PLATE GLASS COMPANY, A CORPORATION F PENNSYLVANIA.

PAINT GUN.

.Application fusa April 1o, 1925. serial No. 22,068.

The invention relates to pneumatic paint guus or brushes, and has for its principal ob- ]ects; the provision of a construction having improved means for regulating the air supply in producing a flat spray and in shifting back and forth between a round and a flat spray; the provision of an improved nozzle construction whereby the removal and replacement of the nozzle tube is made more convenient, and whereby a tight joint is insured between the nozzle tube and body of the gun in which it is mounted; and the provision of an improved arrangement for mounting the trigger which operates the air and paint valves. invention is illustrated in the accompanying f drawings wherein Figure 1 is a plan view. Fig. 2 is a side elevation. Fig. 3 is a section on the lin'e III-TIT of Fig. 4. And Fig. 4 is a section on the lines IVfHIV of Fig. 3.

Referring to the drawings, 1 is the body portion of the gun provided with a handle 2 ,and the head 3. Also with a hook 4 by means of which the device may be hung up. A connection 5 is provided, to which the receptacle containing the paint to be applied is attached. The paint from the receptacle is conducted to the nozzle tube 6 through the passage 7 Extending longitudinally of the body portion is a main air supply passage 8 to which air is supplied through the passages 9 and 10, thelatter terminating at its lower end in the connection 11, to which a supply pipe is connected in the usual way.

The How of air to the passage 8 from the passage 10 is controlled by means of the valve '12 held in closed position by means of the spring 13. the latter abutting at its rear end against the nut 14. The flow of paint through the nozzle tube 6 is controlled by means of the needle valve having a rearwardly extending stem 16 extending through the packing nut 17. The valve is normally held closed by means of the spring 18 which engages the nut 19 at its rear end. Both the air valve 12 and the paint valve 15 are operated from the trigger 20, which has its upper portion in the form of a yoke which straddles the body portion and is pivoted upon the pin 21. This pin 2l is held in position by moans of the set screw 22 and when it is desired to remove the trigger, this is easily done by loosening the set screw 22 and .pushing the pin 21 out endwise. The yoke I portion of the trigger has pivoted to it at 23 a second rearwardly extending yoke 24 which straddles the body portion and has its rear end fitting over the threaded rear end of the paint valve stem 16. The end of the yoke member 24' iS slotted as indicated at 25 and this portion of the member is clamped between the

nuts

26 and 27. When it is desired to release the yoke member 24 from the valve stemr 16, all that is necessary is to loosen the nut 27, after which the yoke member can be moved downward and out of the way. The two

nuts

26 and 27 permitof the longitudinal adjustment of the valve stem One embodiment of the 16 Fitting over the end of the nozzle tube 6 is a nozzle disc 28 which has its inner face coned, as indicated at 29 to fit a correspondingly coned or tapered surface on the forward end of the tube 6. The rear portion of the tube 6 is also coned or tapered as indicated at 30 so as to fit into a correspondingly tapered seat in the head 3. The disc 28 is threaded into the head as indicated at 31, so that when this disc is screwed in tightly, it forces the tube 6 into its tapered seat 30, thus making a tight joint between the head and .the tube., while a correspondingly tightl Ajoint is secured between the disc and the tube at the tapered surface 29. This arrangement assures against any leakage of paint past the nozzle tube and leaves this tube free to be removed without diiiiculty when the disc 28 is unscrewed. The disc 28 is provided with anopening 32 surrounding the outer end of the nozzle tube, and air is supplied to this space through the passages 33. These passages communicate with the space 34 which in turn communicates with a branch passage 35 communicating with the end of the main lair passage' 8 as indicated in Fig. 3. The disc 28 has a relatively loose threaded fit at 31, so that when the disc isscrewed into position as illustrated in Fig. 3, it can center itself upon thetapered forward end of' the nozzle tube 6. The flow of air from the passage 8 to the passage 35 is throttled and controlled by means of the screw 36. The forward end of the head 3 is tapered or coned, as indicated at 37 and upon this tapered portion is mounted the cap 38 which carries the pair of

supplemental discharge passages

39 and 40 for producing a flat spray. This cap is held in position by means of the nut 41. It is provided with a pair of rearwardly extending passages 42 and 43 (Fi 4) which communicateat their rear en s with a groove 44, such groove being formed between the contacting surfaces of the head and the cap and being preferably located inl the ca This groove is supplied'with air throng i the second branch passage 45 (Fig.' 3), which communicates at its rear end with the main passage 8, the flow of air'being regulated or entirely cut oiiz when a roundy to' operate the valves and having a yoke arranged to straddle the -body and having perforations in the ends of the yoke adapted to align with said transverse perforation through the body, a in extending throu h said perforations in t ebody and the yo e and actin as a pivot for the trigger, and a set screw 1n the body extending transversely 'of the pin and engaging the pin and holding it againstendwise movement, the said pin being mountedso as to be freely movable endwise when released by said set screw.

2. In combination in a paint un, 'a body provided with a headhaving' a ongitudinal supply passage terminating in a conical seat at its outer end, a nozzle' tube having its rear end tapered to fit said conical seat and also having lits forward end reversely ta ered,

and a nozzle dise open at its center an having threaded engagement with the head and provided with a tapering seat adapted to iit theb taper upon the outer end of the nozzle tu e.

3. In combination in a aint gun, a body provided with a head having a longitudinal supply passage terminating ina conical seat at its outer end, a nozzle tube having its rear end tapered to fit said conical seat and also having its forward endI rcversely tapered, and a nozzle disc open at its center and having threaded engagement with the head and provided with a tapering seat adapted to fit the taper upon the outer end of the nozzle tube, the fit between the threads of the disc and head being relatively looseso that the diie yis free to center itself upon the nozzle tu e.

4. In combination ina paint gun, a body 'provided wlth a head hav-ing a longitudinal paint supply passage terminating in a conical seat at its outer end and with an air supply passage, a nozzle tube having its rear end tapered 'to fit said conical seat and also 'having its forward -end reversely tapered, and a nozzle disc open at 'its center threaded into the outer end of .thel

head and provided with a 4tapering seat adapted to fit the taper on the outer endvof the nozzle tube and with a .passage leading from its rear end to said open center, the rear end of the disc being spaced away from the head to provide an annular space, and said air supply passage `inthe body terminating at said space.

In testimony` whereof, I have hereunto subscribed my namel this 30 day of March, 1925.

FREDERICK SCHNEIDER.