JPH067688Y2 - Dental motor handpiece - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a motor handpiece used for dental treatment,
In particular, it relates to a motor handpiece suitable for an autoclave.

2. Description of the Related Art A dental motor handpiece is configured such that the handpiece part is detachably attached to the motor part.
There are a straight type and a contra-angle type for the handpiece part, and in each case, a blade is exchangeably attached to the tip of the handpiece for dental treatment.

In dental treatment, since a motor handpiece is inserted into the mouth of a patient to cut an affected part, etc., recently, an autoclaved motor handpiece is used for each patient due to hygiene problems. However, since the motor unit and the handpiece unit are detachable, in particular, it is difficult to autoclave the motor unit because it is difficult to maintain the airtightness of the internal motor.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention has been made for the purpose of providing a motor portion of a motor handpiece with a structure suitable for an autoclave.

In order to achieve the above object, the present invention provides a dental motor handpiece in which a motor section case provided with a circular recess on the joint section side to be joined with the handpiece section, and a joint case fitted into the recess section. The joint case includes a junction piece that abuts against a front end surface of the joint case and a peripheral surface of a base portion is screwed to the motor case, and a motor having a rotating shaft protruding to a central portion of the recess. Is characterized in that a joint shaft coupled to the rotary shaft is supported inside the seal shaft through a seal bearing, and the outer peripheral surface of the joint shaft is airtightly fitted into the recess.

FIG. 1 is a diagram for explaining an embodiment of the present invention, in which 1 is a motor, 2 is its rotating shaft, 3 is a case, and 4 is a hose joint. The motor 1 is inserted into the case 3 from the rear portion of the case 3 and is supported in the case by fixing the rear bearing receiver 5 with a stop pin 6. Reference numeral 7 denotes a circular concave portion formed on the tip side of the case 3, that is, on the joint side, and the rotary shaft 2 of the motor 1 is projected through a circular hole at the bottom thereof. A joint case 8 is airtightly fitted into the circular recess via an O-ring 9. Reference numerals 10 and 11 denote bearings held by a joint case, which are configured as seal bearings having a seal structure and support a joint shaft 12. Reference numeral 13 denotes a pin which is provided on the rotary shaft 2 and which rotationally couples the rotary shaft 2 to the joint shaft 12. Reference numeral 14 denotes a bearing retaining ring that is screwed onto the inner peripheral surface of the distal end portion of the joint case, and exerts a retaining action by pushing the seal bearing to the right. Reference numeral 15 is a sleeve portion of the junction piece, and a peripheral surface 16 of the base portion thereof is screwed to the case 3 with a screw 17. The bottom surface of the junction piece abuts the tip surface of the joint case, and fixes the joint case.

Next, the conversion of the autoclave and the joint will be described.

To carry out the autoclave, it is only necessary to press fit the plug 19 to the tip of the sleeve portion of the junction piece. Even if there is a leak from the periphery of the base of the junction piece, since the O-ring 9 and the seal bearings 10 and 11 are provided, steam for the autoclave will not enter before that. If silicon rubber is applied to the vicinity of the peripheral surface of the junction piece base including the head of the screw 17, airtightness is improved.

To replace the joint, it is sufficient to remove the screw 17 and pull out the junction piece 15. Seal bearing 1
Since 0, 11 and the joint shaft 12 are integrated with the joint case 8 together with the bearing stopper ring 14, the joint portion is simply pulled out, a new joint portion is inserted, and the junction piece 15 is screwed with the screw 17. If the replacement work is completed.

Effect As described above, according to the present invention, the motor part of the dental handpiece can be kept airtight during autoclave, and the joint part is made into a cartridge, which can be easily replaced. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention. 1 ... Motor, 3 ... Case, 7 ... Circular recess, 8 ...
Joint case, 9 ... O-ring, 10, 11 ... Seal bearing, 12 ... Joint shaft, 15 ... Junction piece, 19 ... Plug.

Claims (1)

[Scope of utility model registration request] 1. A motor case having a circular recess on the side of a joint for coupling with a handpiece, a joint case fitted in the recess, and a peripheral surface of the base that abuts against the front end surface of the joint case. Has a junction piece screwed to the motor case, and a motor having a rotating shaft projecting in the center of the recess, and the joint case has a joint shaft connected to the rotating shaft therein. While supporting it through the seal bearing,
A dental motor handpiece, characterized in that the outer peripheral surface of the dental motor is airtightly fitted in the recess by an O-ring.