JPS60861B2 - Periodic reversal drive device in dental handpiece - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dental handpiece used primarily during root canal treatment.

That is, in order to expand and fill the t-daughter tube, a means is required to repeatedly rotate the reamer periodically in the opposite direction.

Several solutions have been proposed to date, but all of them involve direct reversal driving of the reamer mounting sheath and involve design changes within the head of the handpiece body. On the other hand, the present invention can be technically simplified by incorporating a means for this in the gripping handle connected to the rear part of the handpiece body, and also transmits the existing periodic reversal movement itself to the reamer mounting sheath. This allows for smooth operation, and further disassembly of the main parts,
It is an object of the present invention to provide a periodic reversal drive device in which the reversal angle can be arbitrarily changed by making it easy to replace parts.

To explain the following with reference to the embodiments of the drawings, in Fig. 1, reference numeral 1 denotes a handpiece main body, and a rotating shaft mounted in a gripping handle 2 connected to the rear part of the handpiece main body is connected to a drive side shaft 3 and an intermediate transmission to the outer end. It is separated at a distance from the driven shaft 4 to which the gear 10 is fixed.

At the dividing interval, a ball 4 is supported by pivot pins 5, 5' protruding from the top and bottom of the gripping handle 2, rotates only in the horizontal direction, and extends along the circumferential direction on both sides of the pivot pins 5, 5'. An inverted sphere 6 is provided in which engaging grooves 6a and 6'a are bored. The inner end of one of the drive-side shafts 3 that sandwiches the inverted sphere 6 has an inner end surface formed into a spherical head recess 7a in which the spherical head of the inverted sphere 6 fits, and a small hole is formed at an appropriate eccentric position in the recess 7a. A crown body 7 provided with a ball receiving hole 7b is fixed.

On the other hand, the inner end surface of the driven shaft 4 is connected to the inverted sphere 6.
A crown body 8 is formed in a ball head recess 8a with which the ball head fits, and a small ball receiving hole 8b is provided in the recess 8a at an eccentric position outward from the position of the small ball receiving hole 7b of the driving side crown body 7. It is fixed. This state becomes clearer from the enlarged perspective view of the main part in FIG. Then, each of the small ball receiving holes 7b of the above-mentioned both crown bodies 7, 8
, 8b accommodate substantially hemispherical portions of the small balls 9, 9', and the device of the present invention is configured such that the protruding portions thereof are engaged with the small ball engaging grooves 6a, 6'a of the inverted ball 6. be done.

In Fig. 1 of the drawings, 1 is the middle ball, 12 is the head, 13 is the reamer t, and 16 is the relay gear mechanism.

Now, when the driving shaft 3 is rotated, the crown body 7 also rotates, and is located in the receiving hole 7b at the eccentric position of the spherical head recess 7a, and engages with the engagement groove 6a of the inverted sphere 6. The small ball 9 rotates and moves smoothly following the engagement groove 6a of the inverted ball 6.

Therefore, the inversion sphere 6 rotates in one horizontal direction. Then, when the crown body 7 and therefore the small ball 9 rotate 180 degrees on one side of a 360 degree rotation, the rotation is performed in a forward direction, and when the crown body 7 and the small ball 9 rotate by 180 degrees on the opposite side, the rotation is performed in a reverse direction. That is, as a result of this, the reversing sphere 6 repeats periodic reversing movements from side to side (up and down in FIG. 3) centering around the upper and lower pivot pins 5, 5'. The periodic reversal motion generated on the driving side is transmitted to the crown body 8 and hence to the driven shaft 4 by the ball 4 and ball 9' working in the opposite direction on the driven side of the same structure (
(See Figures 3 and 4). In this case, the position of the small ball receiving hole 8b of the driven side crown body 8 is set eccentrically outward from that position of the driving side crown body 7 as described above (that is, R in FIG. 3).
,,R2), so there is no worry that the small sphere will be stopped at the 180 degree switching point of the crown body, or that it will not be able to cross over to the opposite side and rotate in the same direction, and the periodic reversal movement will be smooth. It is reliably transmitted to the foot shaft 4.

The transmission is then transmitted from the driven side shaft 4 to the intermediate shaft 1 via the relay gear mechanism 15, and further to the reamer Kazuki 3 through the engagement between the front gear and the reamer mounting sheath (not shown) in the head. Periodic reversal motion is imparted.

The present invention is as described above, and as mentioned at the beginning, the device itself is housed in the gripping handle 2 that is screwed to the rear of the handpiece body 1, so it is easy to change the design of the mechanism inside the head. It is much easier to work with than the conventional method, and the front part of the handpiece body 1 can be used for general purposes.

In addition, the reamer mounting sheath transmits the already moving periodic reversal motion to the reamer (indirect transmission), and the periodic reversal motion is transmitted to the spherical head recesses 7a of the crown bodies 7, 8 integral with the rotating shaft.
, 8a and the engaging grooves 6a, 6'a of the reversing sphere 6, and the rolling friction of the small balls 9, 9' engaged between them causes an extremely smooth operation. Furthermore, since it is easy to disassemble and replace parts by attaching and detaching the gripping handle 2, it is possible to replace the drive side shaft 3 or the driven side shaft 4 with different eccentric positions of the small balls 9, 9' within the range of R, , R2. The period inversion angle can be changed arbitrarily. From the above, the present invention has the effect of achieving the intended purpose and is truly advantageous.

[Brief explanation of the drawing]

The drawings show an embodiment of the device of the present invention, and FIG. 1 is a partially longitudinal side view, FIG. 2 is an enlarged perspective view of the main part, FIG. 3 is a cross-sectional view of the main part showing the operating state, and FIG. 4 is a cross-sectional view of the main part. It is a vertical side view of the main part same as the above. 1... Handpiece body, 2... Gripping handle, 3... Drive side shaft, 4... Driven side shaft, 5, 5'... ... Pivotal pin, 6... Reversed sphere, 6a, 6'a... Ball engaging groove, 7.
... Coronal body, 7a ... Its spherical concavity, 7b
・・・・・・Part 4・Ball receiving hole, 8・・・Coron body, 6
a...The ball head recess, 8b...The small ball receiving hole,
97 9'...Small ball, 10...Intermediate transmission gear. Labor 1 Rinsai 2 Kojio et al. 1 number 〆 4 females

Claims (1)

[Claims] 1 The rotating shaft mounted in the gripping handle 2 of the handpiece body 1 is divided into a driving side shaft 3 and a driven side shaft 4 to which an intermediate transmission gear 10 is fixed to the outer end, and the gripping handle 2 is inserted between the divided parts. It is supported by pivot pins 5, 5' protruding from above and below and rotates only in the horizontal direction, and small ball engaging grooves 6a, 6'a are bored along the circumferential direction on both sides of the pivot pins 5, 5'. An inverted sphere 6 is provided, and the inner end of one drive side shaft 3 that sandwiches this inverted sphere 6 is provided with a spherical head recess 7a whose inner end surface is fitted with the spherical head of the inverted sphere 6.
A small ball receiving hole 7 is formed at an appropriate eccentric position in the recess 7a.
On the other hand, the inner end of the driven side shaft 4 is formed with a spherical head recess 8a in which the spherical head of the inverted sphere 6 fits, and the recess 8a is provided with the Drive side crown body 7
A small ball receiving hole 8b is located at an eccentric position outside of the position of the small ball receiving hole 7b.
The small balls 9, 9' having approximately hemispherical portions housed in the small ball receiving holes 7b, 8b of both the crowns 7, 8 are inserted into the small ball engaging groove 6a of the inverted ball 6. , 6'a for a periodic reversal drive in a dental handpiece.