JPS6323064Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a connection device between the driving part and the operating part of a dental handpiece, and in particular, the invention relates to a connection device for connecting and releasing the driving part of a dental handpiece. The present invention relates to a handpiece connecting device that eliminates the operation handle of the handpiece and engages and releases the handpiece by relative rotation of the handpiece sleeve and the motor.

(Prior Art) As a connection device between the sleeve portion and the motor portion of the handpiece, an engaging claw made of a spring plate is connected to the other side in conjunction with the operation of a push button protruding from the outer surface of one connecting body of the handpiece. Connection bodies that can be freely engaged and disengaged from the engagement groove have been used for a long time. However, if a push button is provided protruding from the outer surface of the handpiece, it cannot be engaged or disengaged unless the push button is pressed, and it not only lacks a sleek appearance, but also causes the operator to have to carefully grind the teeth. In addition to being a hindrance to treatment, there is also the risk of accidentally pressing the push button during treatment, so there has been a long-awaited need for a handpiece connection device that has a built-in means for engaging and disengaging. In response to this, No. 3815240
There is a joint for a dental handpiece disclosed in US Pat. As shown in FIGS. 9 and 10, in this joint, a pressing pin 120 integrated with an engaging claw 110 incorporated in one drive member A is elastically supported by a spring S, and the other sleeve member B By engaging and connecting the engaging pawl 110 with the engaging groove 130 formed in the pressing pin 12 and rotating the rotary ring 150 that is rotatable on the drive member A.
0 is pressed down by an arcuate cam surface 140, and the engagement claw 110 is released from the engagement groove 130. In addition, US Pat. No. 4,324,548 discloses a device in which a connecting body is engaged and disengaged by pushing an operating ring. Also, Patent Application No. 66029 of 1988
No. (1982 Patent Application Publication No. 194736), C.
Some devices use molded spring members to attach and detach the connecting body.

(Problem to be solved by the invention) However, in the above-mentioned U.S. Pat.
Since a relatively long press pin 120 is required to guide the vertical movement of the cam surface 10 and to receive control from the concave cam surface 140, the installation location must be a thick walled part, which requires a large amount of installation space. It has the drawbacks that there is no space for connecting a medium conduit or an optical fiber for illumination, and that it cannot be engaged or disengaged without operating the rotary ring 150, which has a limited width. Furthermore, in the configuration shown in the above-mentioned US Pat. No. 4,324,548, as in the above-mentioned US Pat. No. 3,815,240, the connecting body cannot be removed without operating the operating ring part, and the pushing direction of the operating ring is limited to one direction. This caused the inconvenience of having to check the pushing direction. Furthermore, in the above-mentioned Patent Application No. 66029 filed in 1982, the engaging portions can be attached and detached by directly inserting and removing the connecting bodies without using an operating ring as in the above two U.S. patents. Although it has its merits, it has the fatal drawback of being easily detached if a slightly large force is applied in the pulling direction.

(Means for Solving the Problems) Hereinafter, the handpiece connecting device of the present invention will be explained with reference to FIG. 3 of the first embodiment.

In the handpiece connecting device of the present invention, the engagement means is an elastic frame 6 having an arc shape larger than 180 degrees, and a cylindrical female body, which is one connecting body of the handpiece, is attached to the outer diameter of the elastic frame 6. An engaging pawl 10 that engages with a circumferential groove 9 on the inner diameter portion and a protrusion 13 that fits into the notch 15 of the female body are formed, and the cylindrical male of the hand piece is formed on the inner diameter portion. The protrusion 12 that fits into the recess 14 on the outer diameter of the body is connected to the engaging claw 10.
is formed on the opposite side of the protruding body 13 of the outer diameter part in the circumferential direction by sandwiching the connecting body, and by relatively rotating the male body and the female body of the connecting body, the connecting body is formed against the elasticity of the elastic frame. It is characterized in that the engaging claw is moved in the centripetal direction to disengage the male body and the female body of the connecting body. Therefore, the present invention eliminates protrusions and operating rotation rings on the outer surface of the handpiece for operating the connecting device, which could cause obstruction during treatment or release the connection by accidental pushing, and makes it possible to easily connect the connecting devices to each other. To provide a relatively compact handpiece connecting device that performs engagement and release operations by relative rotation, prevents inadvertent disengagement even with a small axial force, and requires a small installation space. It is in.

(Operation) Next, the operation will be explained with reference to FIG. A protrusion 13 formed on the outer diameter of the C-shaped elastic frame 6 having an annular shape or a partially cut-out annular ring is a notch 15 of a cylindrical female body which is one connecting body 5 of the hand piece. The protruding body 12 formed on the inner diameter part on the opposite side to the protruding body 13 on the outer diameter part with respect to the engaging claw 10 formed in a protruding state on the outer diameter part fits into the other connecting body 1. It fits into the recess 14 on the outer diameter of the male body, and the elastic force of the frame 6 connects both the connecting bodies 1 and 5.
A protruding body 1 which restrains the relative rotation of
Both connecting bodies 1 in the direction of increasing the distance between 2 and 13,
5 is transmitted to this frame body, and the frame body portion between these protrusions 12 and 13, that is, the engaging claw 10, is displaced in the centripetal direction, and the engaging claw 10 is moved into the inner diameter part of the female body. from the circumferential groove 9. When engaged with the engagement groove 9, the engagement claw 10 maintains the connection engagement between the two connection bodies 1 and 5 in the axial direction of the handpiece, and by the elasticity of the frame 6, connects the two connection bodies 1 and 5 in the circumferential direction. Relative rotation of the connecting bodies 1 and 5 is restrained.

(Embodiment) An embodiment of the handpiece connecting device of the present invention will be described below with reference to the drawings.

<First Embodiment> Fig. 1 is a front view of a dental handpiece incorporating the handpiece connecting device of the present invention, and Fig. 2 is a longitudinal section of the handpiece connecting portion showing the connecting device of the first embodiment. 3 is a sectional view taken along the cutting line in FIG. 2, FIG. 4 is a perspective view of the frame of the same embodiment, and FIG. 5 is the main part of the connecting part which is the female body of the handpiece sleeve of the same embodiment. FIG.

In FIGS. 1 to 5, reference numeral 1 denotes a motor portion of the handpiece, and a rotor 2 is supported inside thereof via a bearing 3. As shown in FIG. The rotational force of the rotor 2 is transmitted via the clutch 4 to an operating shaft 2' within the handpiece sleeve 5, which is connected to the motor section 1.
Reference numeral 6 denotes an elastic frame body, which maintains a gap 7 with respect to the outer diameter of the connection part 19 forming the male body of the motor part 1, and is movable in the radial direction within the range of this gap 7. It is attached to the part by a sleeve nut 8. The outer diameter of the elastic frame 6 is formed to be approximately the same as the inner diameter of the inner diameter portion of the connecting portion forming the female body of the handpiece sleeve 5. As a result, in the connected state, the elastic frame 6 is stably held within the inner diameter portion of the handpiece sleeve 5 without wobbling. The elastic frame 6 is made of a spring steel plate with a relatively large spring constant, and has a chamfered outer corner on the nut 8 side to facilitate engagement and insertion, and a part of the ring is cut out over approximately 60°. It has a contracted part 11, and a part of its outer diameter part is provided with an engaging pawl 10 projecting to engage with a circumferential groove 9 in the inner diameter part of the connecting part of the handpiece sleeve 5,
Short cylindrical protrusions 12 and 13 are fixed to the outer and inner diameter portions of each end so as to sandwich the engaging claw 10 therebetween in the circumferential direction. The height of the engaging pawl 10 is lower than the gap 7 corresponding to the difference between the inner diameter of the frame 6 and the outer diameter of the connecting part 19 of the motor part 1 in order to engage and release the nut 8. The outer peripheral corners of the sides are chamfered. A recess 14 into which the protruding body 12 of the inner diameter of the elastic frame 6 is fitted and a recess 18 into which the elastic body 16 is inserted at the position of the engagement claw 10 are provided on the outer diameter of the connecting portion forming the male body of the motor section 1. It is perforated. The handpiece sleeve 5 also has a notch 15 that fits into the protrusion 13 on the outer diameter of the elastic frame 6.
is formed in the axial direction from the mouth edge of the sleeve 5. The elastic body 16 is made of an elastic material such as a coil spring with a large spring constant, a leaf spring, or elastic rubber.
Since the elastic frame 6 has a notched contraction part 11, it is relatively easy to bend in the radial direction, so the engaging claw 10
This function serves to more reliably engage the handpiece sleeve 9 in the engagement groove 9 and to enhance the stability of the circumferential engagement between the motor section 1 and the handpiece sleeve 5 in the engaged state. 17 is the motor part 1 of the handpiece
This is a connecting tube that is tightened with a nut 8 to the male connecting portion of the connector.

Next, the engagement and release operations in this embodiment will be explained. When connecting the handpiece sleeve 5 to the motor section 1, first insert the handpiece sleeve 5 into the connecting tube 7, and the inner diameter of the handpiece sleeve 5 passes through the nut 8, contacts the elastic frame 6, and comes into contact with the elastic frame 6. The engagement claw 10 acts on the tapered surface 20 provided on the handpiece sleeve 5 side, and the diameter of the elastic frame 6 is reduced by the gap 7 and the contraction portion 11, and the handpiece sleeve 5 is reduced in diameter. When the handpiece sleeve 5 is inserted until it comes into contact with the notch 15 and the protruding body 13 and the end surfaces of the handpiece sleeve 5 and the motor section 1 abut, the engaging claws 10 of the elastic frame 6 move radially outward, and the handpiece sleeve 5, the notch 15 of the handpiece sleeve 5 engages with the protrusion 13, and the handpiece sleeve 5 and the motor part 1 are connected in the axial direction and Connected to prevent accidental dissociation in the circumferential direction. For this reason, the inner diameter side surface 2 of the engagement groove 9 of the handpiece sleeve 5 on the motor section 1 side
1 and the outer diameter side surface 22 of the motor portion 1 of the engaging claw 10 are substantially perpendicular to the axial direction.

When separating the motor part 1 and the handpiece sleeve 5, these two parts 1 and 5 are rotated relative to each other so as to shorten the length of the notch contraction part 11, and the engaging claw 10 is displaced into the gap 7. to release it from the engagement groove 9, and in that state, separate it by pulling it apart in the axial direction.

<Second Embodiment> FIG. 6 is a sectional view corresponding to the cutting line in FIG. 2, showing an elastic frame according to a second embodiment of the present invention.

In FIG. 6, the female connection part of the handpiece sleeve 5 applied to the second embodiment has the same structure as the first example, and the male connection part of the motor part 1a has the inner diameter of the frame 6a. Since the structure is the same except that the recess 14a into which the protrusion 12a of the second embodiment is fitted has a larger diameter and is formed deeper than the recess 14 of the first embodiment, a description thereof will be omitted.

The elastic frame 6a of this embodiment has a clutch shape, and the circumferentially contracted portion of the frame is curved and protruded in a substantially Ω-shape at the portion facing the engagement claw 10a toward the inner diameter side as a projection 12a. It has been formed. Therefore, this protruding body 12a fits into the recess 14a of the connecting part forming the male body of the motor part 1a, and fits into the notch 15 of the sleeve 5.
The frame body 6a is restrained in the axial direction and the circumferential direction together with the protruding body 13a fitted in the motor part 1a.
The deformation in the circumferential direction due to the relative rotation when the handpiece sleeve 5 is engaged with and released from the handpiece sleeve 5 is absorbed by the curvature of the protrusion 12a.

<Third Embodiment> FIG. 7 is a cutaway view corresponding to FIG. 2 showing an elastic frame according to a third embodiment of the present invention, and FIG. 8 is a partially cutaway explanatory view of the contracted portion.

In FIG. 7, the female connection part of the handpiece sleeve 5 applied to the third embodiment has the same structure as the first example, and the male connection part of the motor part 1b has the inner diameter of the frame body 6b. The position of the recess 14b into which the protrusion 12b of the sleeve is inserted is the notch 1 of the sleeve 5 when engaged.
Since the structure is the same as that of 5 except that it is disposed opposite to the axis, a description thereof will be omitted.

The elastic frame 6b of this embodiment is formed in a clutch shape, and the circumferential contraction portion 11b is engaged with the engagement claw 10 of the frame.
As shown in FIG. 8, the portion facing b is cut in a zigzag shape, and the protrusion 12b which fits into the recess 14b of the connecting portion of the male body of the motor portion 1b is inserted into the notch 1 of the connecting portion of the female body of the handpiece sleeve 5.
The contraction portion 11b is fixed in the axial direction to the inner diameter portion at a position facing the protrusion 13b of the outer diameter portion that fits into the spring 11b. The shape of the contraction portion 11b may be zigzag or rectangular panel shape, etc., and may be appropriately selected so as to have flexibility with an appropriate spring constant. The operation of engagement and release is as described in the first embodiment.
It is the same as the embodiment.

(Effects of the Invention) As described above, according to the handpiece connection device of the present invention, the arc-shaped or ring-shaped elastic frames 6, 6a, 6b forming the engagement and release means are connected to the internal connection portion. Because they are fitted and installed in a stable state, there is no need for any parts that protrude from the outer surface of the handpiece, making it easier to perform treatment using the handpiece. , 1a, 1b can be easily engaged and released by a simple relative rotation between them, and it is safe to hold with one hand so that the engagement will not be released inadvertently during treatment. Stable engagement can be maintained in the axial and circumferential directions, and since the mounting space is small, the installation position of the connecting device can be easily selected, and the practical effects are very large.

[Brief explanation of the drawing]

Fig. 1 is a front view of a dental handpiece incorporating the handpiece connecting device of the present invention, Fig. 2 is a longitudinal cross-sectional view of the handpiece connecting part showing the connecting device of the first embodiment, and Fig. 3 is a cross-sectional view taken along the cutting line in FIG. 2, FIG. 4 is a perspective view of the frame of the same embodiment, and FIG. FIG. 6 is a diagram corresponding to the cutting line in FIG. 2 showing the elastic frame of the second embodiment, and FIG.
The figure is Fig. 2 showing the elastic frame of the third embodiment.
FIG. 8 is a partially cut-away explanatory view of the contracted portion of the frame of the same embodiment, and FIGS. 9 and 10 are explanatory views of a conventional connection device. Explanation of symbols: 1, 1a, 1b... One connection body of the handpiece, 5... The other connection body of the same, 6, 6
a, 6b...Engagement means for the elastic frame, 7...Gap,
9...Engagement groove, 10...Engagement claw, 11, 11b...
...Constriction part, 12, 12a, 12b...Protrusion of inner diameter part, 13, 13a, 13b...Protrusion of outer diameter part, 14, 14a, 14b...Concave part of male body, 15
... Notch part of female body, 16 ... Elastic body.

Claims (1)

[Claims for Utility Model Registration] 1. A handpiece connecting device that removably connects the male body of one connecting body of a handpiece and the female body of the other connecting body through an engaging means, The means is an elastic frame having an arc shape larger than at least 180°, the outer diameter of which engages with a circumferential groove of the inner diameter of a cylindrical female body which is one connecting body of the hand piece. A cylindrical male outer body, which is the other connecting body of the hand piece, is formed on the inner diameter of the engaging claw that engages the hand piece in the longitudinal direction and a protruding body that fits into the notch of the female body. A protruding body that fits into the recess of the radial part is formed on the opposite side of the protruding body of the outer diameter part in the circumferential direction by sandwiching the engaging claw, and the male body and the female body of the connecting body are relatively arranged. A hand piece connecting device characterized in that, by rotation, the engaging claw is moved in a centripetal direction against the elasticity of the elastic frame to disengage the male body and the female body of the connecting body. 2. The connection device according to claim 1, wherein the elastic frame has a C-shape in which a portion of a ring is cut out. 3. A utility model in which the elastic frame has a ring shape, and a protruding body is formed by curvedly protruding a part of the frame on the inner diameter side so as to form a contracted portion in the circumferential direction. A connecting device according to registered claim 1. 4. Utility model registration claim 1, wherein the elastic frame is ring-shaped, and a portion thereof is provided with a zigzag-shaped notch that bends in the circumferential direction so as to form a contracted portion in the circumferential direction. Connecting device as described in section. 5 Utility model registration claim 2, in which the elastic frame additionally abuts an elastic body on the inner diameter side of the engaging claw
The connecting device according to Items 1, 3, and 4.