Denken Co., Ltd.

Kdf Co., Ltd.

Masaki Usui

Suguru Ueda

In a second tank unit, a controller controls the on/off switching of a water supply solenoid valve so that water is stored in a sub tank within the level of Lu to Ll. At the same time, the controller controls the on/off switching of a pressurizing solenoid valve and a decompressing solenoid valve so that the air pressure in the upper space in the sub tank is maintained at a target value. As a result, regardless of the water level in the sub tank, the back pressure in the tank is maintained at the target value higher than atmospheric pressure. In this state, when a central controller turns on a water spouting solenoid valve, pressured water rapidly spouts from a nozzle. Moreover, a change in the target values of the back pressure promptly changes the height of the spouting water. Accordingly, water spouting can be promptly started/stopped, and the height or size of the spouting water can be readily and smoothly changed.

Water spouting device

A new apparatus for casting dental prosthesis has been proposed, comprising a ring-placing section onto which plural rings are to be placed, a crucible holder for holding plural cylindrical crucibles, a burning unit with a furnace, a casting unit and a conveyer for conveying the ring or the crucible. The lifting state of the burning unit includes a base capable of rotating around a substantially horizontal axis, an orientation-maintaining mechanism for maintaining the base substantially horizontal and an orientation-changing mechanism for exerting an external force onto the base. The conveyer performs a position-correcting motion for correcting the position of the ring by lowering the gripper. The apparatus provides a management code to each crucible for preventing troubles or delay of work caused by the breaking of crucibles due to the aging.

Apparatus for casting dental prosthesis

The present invention proposes an apparatus for casting dental prosthesis designed to save labor and costly malformations. In a form of the invention, a first arm mechanism for conveying a ring and a second arm mechanism for conveying a crucible are provided to slide along the same guide . A ring-placing platform C and a burning unit G are placed across the guide , and so are a crucible-placing platform D and a casting unit H. When the arm mechanism places a ring on a lifting stage , the lifting stage moves upward to contain the ring in a furnace , where the ring is heated to bum off the wax inside. Meanwhile, the arm mechanism places the crucible in a container , where alloy ingots are melted. After completing the melting of the alloy ingots and the burning of the ring, the arm mechanism conveys the ring onto the top of the crucible in the container . Then, a cover closes the container to constitute a chamber, which is then turned upside-down to carry out the pressure casting. After completing the casting, the ring and the crucible are returned to the platforms C, D by the arm mechanisms , respectively.

An electrically-heated wax spatula apparatus for use in molding and preparing wax models for investment casting in the field of dental prostheses and the field of metal work based on casting, and more particularly a wax spatula apparatus wherein the temperature of its spatula portion for wax-molding work can be adjusted immediately during use. The wax spatula apparatus comprises a spatula body, which is provided with a heating portion accommodating an electric heating element and a temperature sensor at the front end of the grip portion thereof and a wax-molding spatula portion installed in the heating portion, and a temperature controller for controlling the temperature of the spatula portion depending on a temperature signal from said temperature sensor of said heating portion, wherein the temperature controller comprises temperature-setting means capable of independently setting the temperature of the spatula portion at a plurality of temperature levels, and preset temperature selection means for selecting the preset temperature levels determined by said temperature-setting means, and the temperature-setting means is a temperature-setting switch disposed at the front end of the grip portion so as to be operable with a fingertip, whereby the temperature of the spatula portion is changed and adjusted immediately by operating the temperature-setting switch with a fingertip during wax-molding work.

Wax spatula apparatus

While rotating a chamber with a crucible for heating ingots of metal and a mold for receiving molten metal from the crucible enclosed therein from a normal position to a reversed position, when an arrival of the chamber at a preset reference position is detected by a rotary plate and a position sensor , a pressure gas is introduced into the chamber at a time point delayed from the reference position by a preset delay time. The delay time is preset so that the pressurize gas starts pressing the molten metal into a sprue runner immediately after a mouth of the sprue runner is completely closed by the molten metal poured from the crucible . Thus, the molten metal is promptly pressed through the sprue runner into a cavity of the mold before it starts solidifying due to the contact with the mold having a temperature lower than that of the molten metal.

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Kyoto, Japan

Masaki Usui