JPS60862B2 - 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, ``expanding and filling plate tubes requires a means for repeatedly rotating 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, there is an engagement groove that is supported by pin pins 5, 5' protruding from the top and bottom of the grip handle 2, rotates only in the horizontal direction, and runs along the circumferential direction on both sides of the pivot pins 5, 5'. 6a,
An inverted sphere 6 with a hole 6'a is provided. The inner end of one of the drive-side shafts 3 that sandwiches the inverted sphere 6 has an inner surface formed into a spherical head recess 7a with which the spherical head of the inverted sphere 6 fits.
A crown body 7 is fixed thereto, and a protruding engagement piece 9 is provided at an appropriately eccentric position in the recessed portion 7a.

On the other hand, the inner end surface of the driven shaft 4 is connected to the inverted sphere 6.
A crown is formed in a spherical head recess 8a with which the spherical head fits, and a projecting engagement piece 9' is provided in the recess 8a at an eccentric position outward from the position of the projecting engagement piece 9 of the drive side crown body 7. The body 8 is fixed. This state becomes clearer in the enlarged exploded perspective view of the main part shown in FIG. The device of the present invention is configured such that the protruding engaging pieces 9, 9' of the crown bodies 7, 8 are engaged with the engaging grooves 6a, 6'a of the inverted sphere 6. .

In Figure 1 of the drawing, 11' is the intermediate shaft, 12 is the head, 1
3 is a reamer, and 15 is a relay gear mechanism. Now, when the drive side shaft 3 is rotated, the crown body 7 also rotates together, and the protruding engagement piece 9 protruding to the biased D position of the spherical head recess 7a moves to follow the engagement groove 6a of the inverted spherical body 6. Therefore, the inversion sphere 6 rotates in one horizontal direction.

When the crown body 7 rotates 180 degrees on one side of one 360 degree rotation of the crown body 7, and therefore the protruding engagement piece 9, rotates forwardly, and when it rotates 180 degrees on the opposite side beyond that, the protruding engagement piece 9 rotates reversely. 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 thus to the secondary wheel 4 by the protruding coupling piece 9' acting in the opposite direction on the driven side of the same structure (Figs. 3 and 4). reference). In this case, the position of the protruding engagement piece 9' of the driven side crown 8 is set eccentrically outward from that position of the driving side crown 7 as described above (that is, R, < R2 in Fig. 3). Therefore, there is no need to worry about the protruding engagement piece being stopped at the 180 degree notch point of the crown body or rotating in the same direction without being able to cross over to the opposite side, and the periodic reversal movement is smooth and smooth. It is reliably transmitted to the driven side wire 4.

The transmission is then transmitted from the driven side shaft 4 to the intermediate shaft 11 via the relay gear mechanism 15, and further in the head with its front gear and I.
Interlocking with the J-mer mounting sleeve (not shown or not) imparts periodic reversal motion to the lj-mer 13.

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 existing periodic reversal motion to the reamer (indirect transmission). Since the protruding engagement pieces 9 and gf are engaged with and raised by the engagement grooves 6a and 6'a of the inverted sphere 6, the operation is extremely smooth and reliable. Since it is easy to disassemble and replace parts by attaching and detaching, the cycle can be reversed by replacing the driving side shaft 3 or driven side shaft 4 with different eccentric positions of the protruding engagement pieces 9, 9' within the range of R.<R2. The angle can be changed arbitrarily.As described above, the present invention is effective in achieving the intended purpose and is truly advantageous.

[Brief explanation of drawings]

The drawings show an embodiment of the device of the present invention, and FIG. 1 is a partially vertical 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. is a vertical sectional side view of the main part of the same as above. 1...Handpiece body, 2...Gripping handle 3...
・...Drive side shaft, 4...Driver side ball "5, 5'...
・Central pin, 6...Inverted sphere, 6a, 6'a...
Its engagement groove, 7... Crown body, 7a... Its spherical head recess, 8... Crown body, 8a... Its spherical head recess, 9,
9'... Protruding engagement piece, 10... Intermediate transmission gear. O female juice 2 zu soup 3 next spear 4 ball

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 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 of the driving shafts 3 that sandwiches the inverted sphere 6 has an inner end surface formed with a spherical head recess 7a into which the spherical head of the inverted sphere 6 fits, and a recess 7a of the recess 7a. A crown body 7 having a protruding engagement piece 9 provided at an appropriately eccentric position is fixed, and on the other hand, a spherical head recess 8 is provided at the inner end of the driven side shaft 4, the inner end face of which is fitted with the spherical head of the inverted spherical body 6.
A crown body 8 is fixed to the concave portion 8a thereof, and a protruding engagement piece 9' is provided at an eccentric position outward from the position of the protruding engagement piece 9 of the driving side crown body 7, and both of the crown bodies A periodic reversal drive device for a dental handpiece, which is configured to engage protruding engaging pieces 9, 9' of bodies 7, 8 with engaging grooves 6a, 6'a of the reversing sphere 6.