Sand blast nozzle

A nozzle for a sandblasting device having a substantially cylindrical shape with an internal longitudinal compartment covered with a hard material lining member. The compartment extends from the inlet end of the housing with a frusto-conical shape and terminates with a constant diameter at the outlet end. Clamping members are removably mounted around the hose member snuggly covering the housing.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to nozzles, and more particularly, to such 
nozzles used in sand blasting equipment. 
2. Description of the Related Art. 
Nozzles in sand blasting equipment wear off rapidly and their frequent 
replacement is an expensive proposition. Several designs have been used in 
the past to obviate this problem with different degrees of success. 
However, the problem has not been effectively resolved. The industry has 
concentrated on designing a variety of connectors that introduce 
irregularities in the internal compartments of the nozzle. 
Applicant believes that the closest reference corresponds to U.S. Pat. No. 
1,703,029 issued to Fairchild in 1929. However, it differs from the 
present invention because the lining 30 disclosed in this patent consists 
of removable sections that create, between adjoining sections, 
irregularities in the surface thereby producing undesirable turbulences 
that eat away the lining. 
Again, in Van Der Pyl's U.S. Pat. No. 2,332,281, several components, such 
as flanges 22 and 23, cause turbulences that eventually create 
irregularities in the surface of the nozzle. 
Other patents describing the closest subject matter provide for a number of 
more or less complicated features that fail to solve the problem in an 
efficient and economical way. None of these patents suggest the novel 
features of the present invention. 
SUMMARY OF THE INVENTION 
It is one of the main objects of the present invention to provide a nozzle 
for sand blasting that includes a unitary frusto-conical inner sleeve 
component that provides a turbulence-free surface for the existing sand 
under pressure. 
It is another object of this invention to provide such a nozzle that 
resists erosion by avoiding the creation of turbulences within the nozzle 
itself. 
It is still another object of the invention to provide a nozzle that is 
inserted in the hose and aided with clamping members provide a sturdy grip 
that prevents leaks. 
It is yet another object of the present invention to provide such a device 
that is inexpensive to manufacture and maintain while retaining its 
effectiveness. 
Further objects of the invention will be brought out in the following part 
of the specification, wherein detailed description is for the purpose of 
fully disclosing the invention without placing limitations thereon.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring now to FIGS. 1 and 2, where the present invention is generally 
referred to with numeral 10, it can be observed that it basically includes 
a nozzle housing 20 that includes several peripheral wedged shape grooves 
30 that cooperatively engage with an elastic hose or conduit member 40. 
Nozzle housing 20 is inserted inside member 40 a sufficient distance to 
provide a strong grip with the aid of clamping members 50 and 60. Clamping 
member 50 is positioned at the edge of inlet end 22 of housing 20 so that 
a minimum of irregularities are produced on the internal walls of the 
interface between hose member 40 and inlet end 22 of housing 20. Several 
other clamping members 60 are disposed along the rest of hose member 40 
covering housing 20 and adjacent to outlet end 24. Preferably, hose member 
40 covers housing member 20 completely. Inlet end 22 starts with an inner 
diameter that approaches the dimensions of the outer diameter of housing 
20 and this inner diameter is reduced at a continuous straight angle as it 
advances towards substantially the middle of nozzle 10, a distance L. In 
the preferred embodiment, a slight curvature is given to lining member 26 
in the section defined by L and adjacent to inlet end 22. The radius of 
curvature is not less than 10 times L and it is intended to ensure a 
smooth continuity along the internal wall of lining 26. Substantially 
around the middle of nozzle 10, the inner diameter is maintained constant 
to outlet end 24. The longitudinally extending internal compartment of 
nozzle 10 has substantially a frusto-conical shape. Lining member 26 is 
made out of a hard material since it needs to resist high pressurized sand 
coming in contact with its walls. 
It is believed the foregoing description conveys the best understanding of 
the objects and advantages of the present invention. Different embodiments 
may be made of the inventive concept of this invention. It is to be 
understood that all matter disclosed herein is to be interpreted merely as 
illustrative, and not in a limiting sense.