Nakanishi Inc.

Ssmc Inc.

Masanori Mizunuma

Takao Kimura

Keita Yokochi

Eiichi Nakanishi

Koji Kitai

Tatsuo Kikuchi

The dental handpiece of a center-injection type has a bur sleeve () having an axial through hole capable of receiving and detachably holding therein a cutting bur having an axial through hole, upper and lower bearings () for rotatably supporting the bur sleeve (), and an injection nozzle () capable of being inserted into the axial through hole of the cutting bur from its proximal end for injecting cooling water through the other end. The dental handpiece () further has an upper seal means () arranged to seal the space between the upper region of the bur sleeve () and the upper bearing (), and a lower seal means (arranged to seal the space between the lower region of the bur sleeve () and the lower bearing ().

Dental handpiece of center-injection type

A dental handpiece has a head section, a neck section, a grip section connected to the grip section, and a drive unit connected to the grip section. The handpiece also has a detent unit for preventing relative rotation between the neck and grip sections. The detent unit includes a detent pin arranged axially slidably in the grip section, a spring for biasing the pin proximally so that the distal end of the pin is arranged inside the grip section in a rest position, and a catch formed at the proximal end of the neck section for receiving the pin for engagement. When the drive unit is brought into connection to the grip section, the pin is pressed distally to project out of the grip section into engagement in the catch, to thereby prevent relative rotation between the neck section and the grip section.

Dental handpiece

A dental handpiece where the chip air line is selectively switched to the ON-state for using both water and chip air, and to the OFF-state for using only water. The dental handpiece has a switching valve between the circumferential chip air channel and the chip air line in the handpiece body for selectively allowing and preventing communication. Opening the valve switches the communication to the ON-state in which chip air is allowed to pass from the circumferential chip air channel into the chip air line. Closing the valve switches the communication to an OFF-state in which chip air is prevented from passing from the circumferential chip air channel into the chip air line.

Dental handpiece with switching valve for fluid lines

A dental handpiece having a grip with a head in which a treatment tool may be detachably attached. A front casing portion of the grip is continuous to a rear casing portion at an obtuse angle. A first rotary shaft is rotatably supported in the rear casing portion. A cylindrical jacket extends from the head and is arranged in the front casing portion toward the first rotary shaft. A second rotary shaft is rotatably supported in the jacket, and is operatively connected to the treatment tool at one end and to the first rotary shaft at the other end via a gear. The rotary shafts transmit driving force to the head section to drive the treatment tool. The jacket is provided with an engagement groove on its circumferential surface. An engaging device disposed in the rear casing portion detachably engages the groove, thereby fixing the jacket in the front casing portion.

The present invention relates to a dental head unit capable of measuring a root canal length of a patient. The head unit includes a head section having a sleeve rotatably supported therein for detachably holding a cutting tool therein, a neck section extending proximally from the head section and having a proximal end for connecting to a handpiece body, a contact capable of detachably contacting the cutting tool for providing electric connection to the cutting tool when in contact, and a contact holder fixed to a proximal end of the contact and axially slidable with respect to the neck section. The contact holder has a lead attachment to which a lead for electrically connecting the contact to a root canal length measuring device is detachably attached. The present invention also relates to a contact holder assembly including the contact and the contact holder.

Dental head unit capable of measuring root canal length, and contact holder assembly therefor

A needle locker has a body having therein a first needle receiving hole and a second needle receiving hole. The first needle receiving hole is arranged in a direction perpendicular to the cloth feeding direction. The second needle receiving hole is adjacent the first needle receiving hole and arranged in the same direction. Two needles are disposed in the first needle receiving hole in adjacent parallel relationship and are detachably secured in the first needle receiving hole by a first setscrew. A single needle is inserted in and fitted detachably to the second needle receiving hole by a second short needle setscrew.

Needle locker in an overlock sewing machine

There is disclosed an overlock sewing machine. The overlock sewing machine includes a looper switching unit for selecting an overlocking operative state or overlocking inoperative state, a needle clamp member having a first needle holding hole in which two needles are mounted separately in the manner that the two needles are positioned in parallel and a second needle holding hole positioned slightly eccentrically at the front side of the cloth feeding direction and perpendicular to the cloth feeding direction, whereby eight types of overlocking operations and one type of double-loop stitching operation can be effected.

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Kanuma, Japan

Masanori Mizunuma