US2110634A

US2110634A - Sandblast nozzle

Info

Publication number: US2110634A
Application number: US17938A
Authority: US
Inventors: Rehmann August
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-04-25
Filing date: 1935-04-24
Publication date: 1938-03-08
Anticipated expiration: 1955-03-08

Description

Patented Mar. 8, 1938 SANDBLAST NOZZHJE August Hellmann, Berlin-Charlottenburg,

Germany Application April 24, 1935, Serial No. 17,938 lin Germany April 25, lg3d 3 Claims.

Sand blast nozzles having a hard metal insertion are known, wherein the hard metal insertion is hard soldered to an external iron jacket. As the hard metal insertion is very sensitive to shocks or sudden strains owing to the brittle nature of the hard metal, it has already been proposed to sub-divide the insertion into individual anular sections, which may easily be replaced when damaged. A further object of the hard soldering is to ensure that the hard metal insertion cracks less easily, while, in the event of parts cracking in spite of this precaution, such parts might possibly be held fast to the iron jacket.

The hitherto known arrangements display very great drawbacks in practice, so that a general use of hard metal for sand blast nozzles is still not practicable. 'Ihe high wear and tear of hard metal through cracking prevents introduction of hard metal in sand blast nozzles.

The present invention relates to the securing of hard metal insertions to an iron jacket. According to the invention a space is provided between the hard metal insertion and the iron Y jacket, which .is lled with rubber for the purpose of securing the hard metal insertion. With this arrangement, theI hard metal insertion re, quires considerably less or no heating during the securing so that the occurrence of non-permissible annular strains in the inserted body is prevented immediately upon manufacture. The layer of rubber between the inserted body and the iron jacket is also intended to absorb shocks and expansion strains, whereby the cracking of the hard metal body, which is so frequently observed in the case of hard soldered nozzles, is practically obviated.

A very advantageous constructional form of the invention resides in the provision of a layer of rubber between the hard metal insertion andthe iron jacket, the arrangement being such that the hard metal insertion and the -iron jacket may be rmly connected with the rubber layer by vulcanization. The securing may also be efiected by inserting a rubber jacket ir the iron (ci. en -n) jacket, and attaching the hard metal insertion by pressing in (forced fit). The latter method of attachment renders possible a convenient replacement-of the hard metal bodies. The space between the inserted body and the iron jacket may be of any form.

Two constructional forms of the invention are illustrated by way of example in the accompany- -ing drawing, wherein Figures 1 andy 2 are -longitudinal sections respectively of the two forms of sand blast nozzle.

In the drawing, l designates the iron jacket; 2 and 3 the hard metal parts, and 4 a layer of rubber. The hard metal insertion may also consist of only a single part instead of two or more parts.

The term hard metal in the specification comprises all known sintered hard metal carbides for instance the carbides of tungsten,

' molybdenum, titanium, tantalum, vanadium,

boron, silicon with or without metallic binders such as iron, cobalt, nickel or tungsten or molybdenum and includes further all cast hard metals which are commerciallyl known under the registered trade-mark Stellite and High speed steel which contains tungsten and cobalt.

Having now particularly described and ascertained the nature of my said inventionand in what manner the same is to beperformed, I declare that what I claim iszl. A sand blast nozzle having a jacket and a hard liner concentrically arranged therein, characterized by the fact that the liner is attached in the jacket by a layer of soft rubberarranged between said hard liner and said jacket. i

2. A sand blast nozzle ,according to claim 1 characterized by the fact that the jacket and said hard liner are firmly connected with said rubber layer by vulcanization.

3. A sand blast nozzle having a jacket and a hard line-r concentrically arranged therein, characterized by the fact that the hard liner is attached in the rubber layer by frictional contact.

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