Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1984-09-12
1986-11-25
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51415, 51427, 51425, B24C 306, B24C 502, B24C 700
Patent
active
046240802
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an arrangement for use with blasting equipment where the orifice through which the blasting sand is sprayed is surrounded by a shield within which there exists an underpressure. The exiting blasting sand is by this means sucked back such that it does not get outside the shield.
BACKGROUND
Blasting with particles such as sand or steel grit is in many respects a suitable method for cleaning or surface treatment. However, flying particles constitute an industrial health hazard, particularly when working with objects which cannot be completely enclosed in an air-tight box. It is, however, known that this disadvantage can be avoided by equipping the orifice, through which the blasting material is ejected, with a shield within which there exists an underpressure. This shield has an opening which is pressed against the object to be blast-treated and in this way the blasting material is prevented from spreading to the immediate surroundings and the treatment can be concentrated to a restricted area without the blasting material spreading diffusely over a larger area. By means of the underpressure the ejected sand is sucked away.
For blasting equipment of this kind it is known that safety features are incorporated which prevent the blasting material from being ejected if the shield opening is unrestricted and not pressed against a workpiece. Thus there is no risk of blasting material being ejected freely through the opening and thereby causing damage.
Such a known safety arrangement is based on registering the underpressure within the shield; if the shield opening is pressed against an object the underpressure is greater than when the opening is unrestricted.
TECHNICAL PROBLEM
It has been shown that a safety arrangement of the type described, and having the correct function, is difficult to realise. The pressure differences within the shield between the restricted and the non-restricted opening can be very small, particularly when one considers irregularly shaped workpieces which allow a certain inleakage of air through the opening. Another disadvantage is that a blasting arrangement of the type described is relatively complicated, having different channels for air supply, blasting material and for leading away of the latter, and in addition arrangements for starting and stopping of the ejector via actuating devices.
Moreover, it has been established that arrangements of said type suffer from the disadvantage that it is difficult to obtain a reasonable spread of blasting material because the free length of the jet must be kept relatively short so that the length of the shield is not impracticably large.
SOLUTION
These disadvantages have been eliminated in the invention by coupling the actuating devices and the safety arrangement in such a way that the automatic actuation via the said underpressure is more definitive and sure. In addition, arrangements for obtaining a better spreading of the jet of blasting material have been effected.
ADVANTAGES
The invention makes for a simpler arrangement than with earlier solutions and moreover for a very positive function. The invention also ensures that the jet of blasting material is given a satisfactorily large spread even for short free lengths, thus enabling a shield with small dimensions to be realised.
BRIEF DESCRIPTION OF DRAWINGS
One form of the invention is shown on the following drawings.
FIG. 1 is a perspective view of a blasting unit in operation;
FIG. 2 shows a section through the blasting pistol used with the unit; and
FIG. 3 shows a section through the control gear used with the said safety arrangement.
PREFERRED EMBODIMENT
As shown in FIG. 1, a blasting unit consists of a stationary part 1 and a blasting pistol 2 together with a hose which connects these two main parts. The stationary part 1 consists of a housing 4 which can be equipped with wheels 5. Part 1 is, by means of a hose 6, connected to an air compressor and, by means of a cable 7, to an electrical supply. The stationary part 1 is connected t
REFERENCES:
patent: 2455514 (1948-12-01), Mead
patent: 3286406 (1966-11-01), Ashworth
patent: 3893262 (1975-07-01), Giese
patent: 4232487 (1980-11-01), Brown
patent: 4333277 (1982-06-01), Tasedan
patent: 4505077 (1985-03-01), Sheesley et al.
Bilskade-Service HB
Rose Robert A.
Schmidt Frederick R.
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