US3032930A

US3032930A - Nozzle for abrasives

Info

Publication number: US3032930A
Application number: US843781A
Authority: US
Inventors: Sumner B Williams
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-10-01
Filing date: 1959-10-01
Publication date: 1962-05-08
Anticipated expiration: 1979-05-08

Description

May 8,, 1962 s. B. WILLIAMS NOZZLE FOR ABRASIVES Filed Oct. 1, 1959 INVENTOR. SUMNER B. WILLIAMS BY ATTORNE Y United States Patent Office 3,032,930 Patented May 8, 1962 3,032,930 NOZZLE FOR ABRASIVES Sumner B. Williams, 50 Deborah Road, Newton, Mass. Filed Oct. 1, 1959, Ser. No. 843,781 2 Claims. (Cl. 51-11) This invention relates to a nozzle for applying powdered abrasive. In particular, it relates to a sand blasting nozzle having more uniform flow and greatly improved wearing characteristics.

As the art of sand blasting has become more refined many industrial uses have arisen requiring sensitivity of control. Thus, for example, in preparing the surface of a metal plate for use in lithography it is desired to etch the surface with very small abrasive granules. The only arrangements that have been hitherto used or proposed for such purposes have suffered from several deficiencies. One deficiency has been the difficulty of obtaining true and stable alignment within the nozzle arrangement so as to get uniformity of flow and application. Also, abrasives often get through the washers and couplings required by some previously described nozzle arrangements. Another deficiency has been the rapid development of a terminal orifice eccentricity in the nozzle which is also partially due to the eccentric flow of the abrasive or lack of stable alignment. Since the surface treatment required for lithographic plates should be uniform and carefully controlled, the use of previously described nozzle arrangements has been costly and has resulted in a substantial percentage of non-uniform plates.

One object of this invention is to provide a novel nozzle for abrasives which will permit superior alignment and greater uniformity of flow.

A further object of this invention is to provide such a nozzle which will have more even wearing characteristics and thus a longer period of useful life.

Other objects and advantages of this invention will be apparent from the specification and claims that follow and from the drawings of a preferred embodiment in which:

FIGURE 1 is a side view of the nozzle with a partial longitudinal section together with a pipe and a hose in phantom.

FIGURE 2 is a rear end view of the nozzle alone.

FIGURE 3 is a front end view of the nozzle alone.

The objects of this invention are provided by a unitary nozzle having in connected sequence and along a common axis, an internally threaded cylindrical tubular section adapted to receive the externally threaded pipe end of a hose, an internal frustro-conical tubular section Whose base is co-extensive with the end of the threaded section and an internal cylindrical tubular section extending from the frustro-conical section and terminating in a circular outer flow orifice. The nozzle is preferably made in one piece from an abrasive-resistant material. In production, the nozzle can be made by casting.

This type of nozzle provides true seating and alignment and permits the abrasive material to flow exclusively over a smooth uniform surface. There is no threaded path to divert the abrasive granules. Further, no washers or couplings are required in the connection between pipe 17 and nozzle 11. In use, the wear of the conduits are uniform and avoid the common problem of eccentric wear known in the trade as key-holing" which is the formation of a non-circular external flow orifice.

In the embodiment illustrated in the drawings, the nozzle 11 is shown with the rear open cylindrical tubular section 12 having inner threading 12A at the end which is the base of the frustro-conical tubular section 13. At the tapering end of section 13 is a cylindrical tubular section 14- terminating in outer flow orifice 15 wherein the flat end is perpendicular to the longitudinal axis of this series of tubular arrangements. A pipe such as 17 is threadable into the threaded section 12 so that it seats up against the inner flow orifice 16. The sand blast hose 18 is attached to the other end of the pipe with a conventional hose clasp 19. There is, thus, an uninterrupted smooth path for the abrasive granules between the end of the pipe and the outer orifice 15.

While the preferred embodiment of my invention has been described in detail, it will be understood that I do not wish to be limited to the particular construction set forth, since various changes in the form, material, proportions and arrangement of parts, and in the details of construction may be resorted to without departing from the spirit and scope of the invention, or destroying any of the advantages contained in the same, heretofore described and defined in the following claims.

I claim:

1. In an abrasive-blasting apparatus of the type containing a hose, a pipe connected to the hose and having terminal exterior threading and a nozzle arrangement threadably secured to the pipe, a nozzle arrangement consisting solely of a unitary member made from an abrasiveresistant material and having in connected sequence and on a common longitudinal axis, a rear, internally threaded cylindrical tubular section to receive said pipe, extended by a median section having an internal frusto-conical bore of decreasing cross section, extended by a terminating section having a internal cylindrical tubular bore.

2. In an abrasive-blasting apparatus of the type containing a hose, a pipe connected to the hose and having terminal exterior threading and a nozzle arrangement threadably secured to the pipe, said nozzle arrangement consisting solely of a unitary member made from an abrasive-resistant material and having in connected sequence and on a common longitudinal axis, a rear, internally threaded cylindrical tubular section to receive said pipe, extended by a median section having an internal frusto-conical bore having a decreasing cross section, ex tended by a terminating section having an internal terminal cylindrical tubular bore, the base of said median regular frustro-conical section being co-extensive with the end of said rear section, the top of said threaded cylindrical section, the top of said frustro-conical section being co-extensive with the base of said terminal cylindrical section, the interior surfaces of said bores of said sections being smooth, uniform and continuous.

References Cited in the file of this patent UNITED STATES PATENTS 561,483 Bryce June 2, 1896 FOREIGN PATENTS 131,161 Switzerland Apr. 1, 1929 722,464 Great Britain I an. 26, 1955