Abrading – Machine – Sandblast
Reexamination Certificate
1999-06-21
2001-02-27
Rose, Robert A. (Department: 3723)
Abrading
Machine
Sandblast
C451S090000, C451S087000
Reexamination Certificate
active
06193589
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a hand piece apparatus that can be used in cleaning devices in order to remove and capture dirt and debris from a surface by using abrasive particles with mixture of high pressurized air and vacuum. More particularly, the invention relates to a hand piece that can controllably regulate the amount of the pressure applied to a surface and the pressurized abrasive particles in hand piece can also be limited from circulation or can be blocked completely at the hand piece's nozzle head assembly for safe operational use.
BACKGROUND OF THE INVENTION
Abrasive cleaning devices are well known as surfacing applicators to treat surfaces for cleaning, smoothing, etching and resurfacing a damaged area such as human skin. These devices operate on a high stream of a pressurized air or vacuum suction to carry abrasive particles to be impinged against the surface. The high pressure of abrasive particles removes dirt and debris from a surface and provides an extremely satisfactory cleaning means. However, considerable risks are involved with such pressurized abrasive cleaning operations. Many of the cleaning operations such as resurfacing human skin are performed near or on the face area. The pressurized abrasive particles along with its dust form particles may cause hazardous health risk to the patient and the operator. Therefore, it is necessary for the operator to visually monitor and control the amount of pressure applied to a surface with a controllable hand piece that can conveniently function at the operator's command.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved hand piece apparatus for use with abrasive cleaning devices. This hand piece uses a control switch that can controllably regulate the amount of pressure applied on a surface. The control switch preferably is a dial switch and located inside the nozzle head assembly of the hand piece and easily accessible by an operator.
It is another object of this invention to enable the operator to use the control dial switch to limit or block the stream of the pressurized abrasive particles. This control switch conveniently provides three positions: full-flow pressure, low-flow pressure and shut-off or block position.
It is still another object of this invention to use a handle that is ergonomically designed for ease of operational use and conveniently enable the operator to access the control switch thereof.
It is also another object of the present invention to connect the nozzle head assembly inlet port and outlet port to a pair of vacuum tubes in order to reduce the residue of the hand piece material on a treating surface. The preference of this invention is to eliminate any lumens in the handle for purpose of high pressure passages.
These objects are attained by using a hand piece that comprises a housing assembly, a nozzle head assembly and a pair of vacuum tubes. The hand piece's housing assembly also includes a nosepiece with a protruded frontal hole for purpose of contacting the debris surfaces, a handle consist of two half members with flat sides and rounded on the top and bottom, and an end piece with an opening for passage of vacuum tubes. The housing assembly of the hand piece further accommodates the nozzle head assembly, which is preferably secured at the nosepiece and the handle. A pair of vacuum tubes from the vacuum source and control unit are connected to the inlet port and outlet port of the nozzle head assembly. The inlet port having a conical opening at the proximal end and an orifice at the distal end for ejecting a mixture of high pressurized air with stream of abrasive particles onto a surface. However, the outlet port of the nozzle head assembly retrieves the abrasive particles along with debris particles from the surface by means of vacuum suction. A control dial switch is placed inside of the nozzle head assembly to manipulate and restrict the applied pressure as enters into the inlet port of the nozzle head assembly. An operator can easily rotate the dial switch in direction of clockwise or counter-clockwise, to control the amount of abrasive particles or simply shut off the flow of abrasive particles in the nozzle head assembly.
Further objects and advantages of this invention will become apparent from consideration of the drawings and description that follows.
REFERENCES:
patent: 4333277 (1982-06-01), Tasedan
patent: 5037432 (1991-08-01), Molinari
patent: 5100412 (1992-03-01), Rosso
patent: 5971999 (1999-10-01), Naldoni
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