Patent Publication Number: US-2010112514-A1

Title: Wireless dental handpiece

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a dental handpiece and more particularly to a wireless dental handpiece that is convenient for use and avoids power cable tangling during a dental treatment. 
     2. Description of the Related Art 
     A dental handpiece is a requisite instrument during the treatment of teeth inside a patient&#39;s mouth. Basically, a dental handpiece uses a power-driven high-speed rotating mechanism to drive a pin or drill in a bearing at the front end of the handpiece body, thereby performing a dental treatment or operation. 
     To provide the high-speed rotating mechanism with the necessary working voltage, a dental handpiece has a power cable for connection to a power supply outlet. This power cable may be stretched accidentally, causing biasing of the handpiece body. Further, the power cable imparts a pressure to the handpiece body, hindering adjustment of the angle of the handpiece body by the dentist. 
     Therefore, it is desirable to provide a dental handpiece that eliminates the aforesaid problems. 
     SUMMARY OF THE INVENTION 
     The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide a wireless dental handpiece, which facilitates operation and avoids cable tangling during operation. 
     To achieve this and other objects of the present invention, the wireless dental handpiece is comprised of a handpiece body and a charging socket. The handpiece body has installed therein a rechargeable battery, a charging loop, and a conducting terminal. The charging socket has a contact terminal. When inserted the handpiece body into the charging socket to force the conducting terminal into contact with the contact terminal, the charging loop charges the rechargeable battery with a power supply from the charging socket to the saturated status. Thus, the wireless dental handpiece needs not to connect with a power cable, avoiding cable tangling during operation. 
     Further, the charging socket can be installed in the bracket table arm of a dental unit near the instrument tray so that the dentist can insert the handpiece body into the charging socket conveniently to have the rechargeable battery to be charged to the saturated status when battery power low. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded plain view of a wireless dental handpiece in accordance with the present invention. 
         FIG. 2  is a plain assembly view of the wireless dental handpiece in accordance with the present invention. 
         FIG. 3  is a schematic drawing of the present invention, showing the charging socket of the wireless dental handpiece installed in a bracket table arm of a dental unit. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 and 2 , a wireless dental handpiece in accordance with the present invention is shown comprising a handpiece body  1  and a charging socket  2 . 
     The handpiece body  1  has installed therein a rechargeable battery  11 , a charging loop  12 , and a conducting terminal  13 . The conducting terminal  13  is installed in a plug hole  14  on the rear end of the handpiece body  1 , and electrically connected to the rechargeable battery  11  through the charging loop  12 . The handpiece body  1  further houses a high-speed rotating mechanism (not shown). The rechargeable battery  11  provides the high-speed rotating mechanism with the necessary working voltage. The charging socket  2  has a socket hole  22  adapted to accommodate the handpiece body  1 , and an electric terminal  21  installed in the socket hole  22  for the contact of the conducting terminal  13 . 
     Referring to  FIG. 2 , when inserted the rear end of the handpiece body  1  into the socket hole  22  of the charging socket  2 , the contact terminal  21  is inserted into the plug hole  14  to contact the conducting terminal  13 , causing the charging loop  12  to charge the rechargeable battery  11  to the saturated status for normal operation. Further, the handpiece body  1  is provided with an indicator light  15  electrically connected to the charging loop  12  for charging saturation indication. 
     By means of the application of the present invention, the wireless dental handpiece needs not to connect with a power cable, avoiding cable tangling during the treatment of teeth inside a patient&#39;s mouth. 
     Referring to  FIGS. 3 and 3A , the charging socket  2  is installed in a part of the bracket table arm of a dental unit  3  near the instrument tray  31 . The handpiece body  1  can be inserted into the charging socket  2  to have the rechargeable battery  11  be charged to the saturated status when the power of the rechargeable battery  11  is low. 
     Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.