CN216455362U - Back cover subassembly, aircraft nose and dental handpiece of dental handpiece - Google Patents

Abstract

The embodiment of the utility model provides a rear cover assembly, a handpiece of a dental handpiece and the dental handpiece [ chofn1], and relates to the technical field of oral treatment.A user applies force to the rear cover to rotate the rear cover when needing to press the rear cover to disassemble and assemble a needle, when the rear cover rotates to a first position, the rear cover can be pressed down to move towards the bottom wall of an accommodating groove, an elastic piece is compressed until a propping part contacts with a pressing piece and pushes against the pressing piece, and after the needle is disassembled and assembled, the rear cover is loosened, so that the rear cover moves towards the direction far away from the bottom wall of the accommodating groove under the action of the resilience force of the elastic piece, and the propping part is separated from the pressing piece; when the operator uses dental handpiece after having installed the car needle, make the back lid rotate to the second position to the back lid application of force, limit structure just can stop the back lid to the diapire of storage tank and remove to prevent that the portion contact is being pivoted pressing member is held in the top, in order to avoid because of the back lid intensification phenomenon that the frictional heating leaded to, and then can not scald the human body.

Description

Back cover subassembly, aircraft nose and dental handpiece of dental handpiece

Technical Field

The utility model relates to the technical field of oral treatment, in particular to a rear cover assembly, a handpiece of a dental handpiece and the dental handpiece.

Background

At present when treating oral cavity patient, inevitable need use dental handpiece to polish, cut the osseous tissue in patient's oral cavity etc. however, through the inventor research discovery, dental handpiece's car needle clamping mode is back lid push type usually, in carrying out oral cavity treatment process, back lid probably is touched by the mistake and is pressed when patient intraoral during operation, lead to the back lid to touch rotating car needle pressing member, thereby pressing member and back lid friction produce a large amount of heats, and then the back lid intensifies, if the back lid touches the human body this moment, then probably lead to the human scald.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a rear cover assembly, a handpiece of a dental handpiece and the dental handpiece, which can prevent the rear cover from being touched and pressed by mistake to be contacted with a pressing piece rotating at a high speed in the use process of the dental handpiece, thereby avoiding the temperature rise phenomenon of the rear cover caused by friction heat generation.

The embodiment of the utility model is realized by the following steps:

in a first aspect, the present invention provides a rear cover assembly comprising:

the supporting body is provided with a through hole and an accommodating groove which are communicated, and the through hole is used for penetrating through the pressing piece;

the rear cover is at least partially accommodated in the accommodating groove and can rotate relative to the support body, and a jacking part opposite to the through hole is arranged on the inner side of the top wall of the rear cover;

the elastic piece is abutted between the top wall of the rear cover and the bottom wall of the accommodating groove;

the limiting structure is arranged between the outer peripheral wall of the rear cover and the inner peripheral wall of the accommodating groove;

when the rear cover rotates to a first position relative to the support body, the rear cover can move towards the bottom wall of the accommodating groove so as to compress the elastic piece and enable the jacking part to contact the pressing piece;

when the rear cover rotates to a second position relative to the support body, the limiting structure can prevent the rear cover from moving towards the bottom wall of the accommodating groove.

In an alternative embodiment, one of the outer peripheral wall of the rear cover and the inner peripheral wall of the accommodating groove is provided with a circumferentially extending limiting groove, the other of the outer peripheral wall of the rear cover and the inner peripheral wall of the accommodating groove is provided with a circumferentially extending limiting projection, and the limiting structure comprises the limiting groove and the limiting projection;

when the rear cover rotates to the first position relative to the support body, the limiting protrusion is separated from the limiting groove;

when the rear cover rotates to the second position relative to the support body, the limiting groove is used for accommodating the limiting protrusion.

In an optional embodiment, the limiting structure comprises at least two limiting grooves and two limiting protrusions, the number of the limiting grooves is equal to the number of the limiting protrusions, each limiting groove is circumferentially arranged at intervals on one of the outer circumferential wall of the rear cover and the inner circumferential wall of the accommodating groove, and each limiting protrusion is circumferentially arranged at intervals on the other of the outer circumferential wall of the rear cover and the inner circumferential wall of the accommodating groove;

when the rear cover rotates to the first position relative to the support body, each limiting protrusion is positioned between every two adjacent limiting grooves;

when the rear cover rotates to the second position relative to the support body, each limiting groove is used for accommodating one limiting protrusion.

In an optional embodiment, the outer peripheral wall of the rear cover is provided with the circumferentially extending limiting protrusion, and the inner peripheral wall of the accommodating groove is provided with the circumferentially extending limiting groove.

In an alternative embodiment, the stopper projection is located at the bottom of the outer peripheral wall of the rear cover.

In an optional embodiment, the inner peripheral wall of the accommodating groove is provided with a first clamping protrusion and a second clamping protrusion which are spaced apart from each other, and the first clamping protrusion is far away from the bottom wall of the accommodating groove relative to the second clamping protrusion;

the first clamping protrusions surround the top of the inner periphery of the accommodating groove, at least two second clamping protrusions are arranged, the second clamping protrusions are circumferentially arranged at intervals at the bottom of the inner periphery of the accommodating groove, and each second clamping protrusion extends along the circumferential direction of the accommodating groove;

the first clamping protrusions and the second clamping protrusions jointly enclose at least two limiting grooves.

In an optional embodiment, a first guide inclined plane is arranged between the inner peripheral surface of the first holding projection and the top surface of the first holding projection, and the first guide inclined planes form an included angle with the inner peripheral surface of the first holding projection and the top surface of the first holding projection;

the bottom surface of the limiting bulge and the outer peripheral surface of the limiting bulge are provided with second guide inclined planes, the second guide inclined planes are respectively matched with the bottom surface of the limiting bulge and the outer peripheral surface of the limiting bulge to form included angles, and the first guide inclined planes are matched with the second guide inclined planes.

In a second aspect, the present invention provides a handpiece for a dental handpiece, comprising:

the top end and the bottom end of the machine head shell are both open;

the rear cover assembly of any one of the preceding embodiments, wherein the supporting body is disposed at a top end of the handpiece shell, one side of the supporting body, which is away from the handpiece shell, is provided with the accommodating groove, and the through hole is close to the handpiece shell relative to the accommodating groove;

the pressing piece is rotatably arranged in the machine head shell, and one end of the pressing piece penetrates through the through hole and is spaced from the jacking part.

In a third aspect, the present invention provides a dental handpiece comprising a handpiece of a dental handpiece as described in the previous embodiments.

The beneficial effects of the embodiment of the utility model include, for example:

the supporting body is provided with a through hole and an accommodating groove which are communicated, and the through hole is used for penetrating through the pressing piece. The rear cover is at least partially accommodated in the accommodating groove and can rotate relative to the support body, wherein a jacking part opposite to the through hole is arranged on the inner side of the top wall of the rear cover. The elastic piece is abutted between the top wall of the rear cover and the bottom wall of the accommodating groove. The limiting structure is arranged between the outer peripheral wall of the rear cover and the inner peripheral wall of the containing groove. When the rear cover rotates to a first position relative to the support body, the rear cover can move towards the bottom wall of the accommodating groove so as to compress the elastic piece and enable the propping part to contact the pressing piece. When the rear cover rotates to a second position relative to the support body, the limiting structure can prevent the rear cover from moving towards the bottom wall of the accommodating groove. When the rear cover rotates to the first position, the rear cover can be pressed down, so that the rear cover moves towards the bottom wall of the accommodating groove, the elastic piece is compressed until the propping part contacts the pressing piece and pushes against the pressing piece, after the needle is assembled and disassembled, the rear cover is loosened, so that the rear cover moves towards the direction far away from the bottom wall of the accommodating groove under the effect of the resilience force of the elastic piece, and the propping part is separated from the pressing piece; when the operator uses dental handpiece after having installed the car needle, make the back lid rotate to the second position to the back lid application of force, limit structure just can stop the back lid to the diapire of storage tank removes to prevent that the portion contact of holding is at high-speed pivoted pressing piece, in order to avoid because of the back lid intensification phenomenon that the frictional heating leads to, and then can not scald the human body.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic view of a handpiece in accordance with an embodiment of the present invention;

FIG. 2 is a schematic view of a combination of a rear cover assembly and a pressing member according to an embodiment of the present invention;

FIG. 3 is a schematic view of a support according to an embodiment of the present invention from a first perspective;

FIG. 4 is a cross-sectional view of a support body according to an embodiment of the present invention;

FIG. 5 is a schematic view of a support according to an embodiment of the present invention from a second perspective;

FIG. 6 is a schematic view of a rear cover according to an embodiment of the present invention.

1-handpiece shell; 2-pressing piece; 3-a rear cover assembly; 30-a support; 301-a through hole; 302-a receiving groove; 3021-a limiting groove; 3023-a first retaining projection; 3024-first guiding bevel; 3025-a second catch projection; 32-rear cover; 321-a top holding part; 323-limit projection; 325-second guiding inclined plane; 34-an elastic member; 4-wind wheel; 5-a bearing; 6-shaft sleeve; 7-clamping the pin elastic sheet; 8-needle turning.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

At present when treating oral cavity patient, inevitable need use dental handpiece to polish, cut the osseous tissue in patient's oral cavity etc. however, through the inventor research discovery, current dental handpiece's car needle clamping mode is back lid push type usually, in carrying out oral cavity treatment process, the back lid probably is touched by the mistake and is pressed down at patient intraoral during operation, lead to the back lid to touch the car needle pressing piece that is rotating, thereby pressing piece and back lid friction produce a large amount of heats, and then the back lid intensifies, if the back lid touches the human body this moment, then probably lead to the human scald.

In view of the above-mentioned drawbacks, the inventors have studied and proposed the following embodiments to improve, wherein it is to be noted that, in the case of no conflict, features in the following embodiments and examples may be combined with each other.

The embodiment of the utility model provides a dental handpiece which comprises a handpiece neck and a handpiece connected to one end of the handpiece neck. Referring to fig. 1, the handpiece includes a handpiece housing 1, a wind wheel 4, a bearing 5, a shaft sleeve 6, a needle clamping elastic sheet 7, a rear cover assembly 3 and a pressing member 2. The top and the bottom of aircraft nose casing 1 all open, and back lid subassembly 3 sets up in the top of aircraft nose casing 1, presss from both sides needle shell fragment 7 and sets up in axle sleeve 6 for centre gripping car needle 8. The bearing 5 is two, overlaps the both ends of locating axle sleeve 6 respectively to axle sleeve 6 sets up in aircraft nose casing 1 through two bearings 5, and can rotate for aircraft nose casing 1, thereby drives and is pressed from both sides the car needle 8 rotation of the centre gripping of needle shell fragment 7, and, bearing 5 can also guarantee the rotation precision of car needle 8, stabilizes the rotation of car needle 8. The pressing piece 2 is arranged in the shaft sleeve 6 and is positioned between the rear cover component 3 and the needle clamping elastic sheet 7, so that the pressing piece can be rotatably arranged in the handpiece shell 1. When the pressing piece 2 receives external force, the pressing piece 2 can extrude the needle clamping elastic sheet 7, so that the needle clamping elastic sheet 7 is expanded, and a needle 8 can be put into or taken out of the expanded needle clamping elastic sheet 7. The wind wheel 4 is sleeved outside the shaft sleeve 6, and the wind wheel 4 is positioned between the two bearings 5, so that when the wind wheel 4 is blown by the blowing pipe, the wind wheel 4 can rotate under the action of flowing air flow, and the shaft sleeve 6 is driven to rotate so as to realize the rotation of the needle 8. Of course, in other embodiments, the wind wheel 4 may be replaced by a movement gear, and the rotation of the shaft sleeve 6 is realized by driving the driving motor to be in transmission connection with the transmission shaft.

Referring to fig. 1 and 2, the rear cover assembly 3 includes a supporting body 30, a rear cover 32, an elastic member 34, and a limiting structure. The support body 30 is disposed on the top end of the handpiece housing 1, the support body 30 is provided with a through hole 301 and an accommodating groove 302 which are communicated with each other, specifically, one side of the support body 30, which is away from the handpiece housing 1, is provided with the accommodating groove 302, the through hole 301 is close to the handpiece housing 1 relative to the accommodating groove 302, and the through hole 301 is used for penetrating the pressing piece 2, that is, one end of the pressing piece 2 penetrates the through hole 301. The rear cover 32 is at least partially received in the receiving groove 302 and can rotate relative to the supporting body 30, wherein a supporting portion 321 opposite to the through hole 301 is disposed on an inner side of a top wall of the rear cover 32, and one end of the pressing member 2 is spaced from the supporting portion 321. The elastic member 34 is abutted between the top wall of the rear cover 32 and the bottom wall of the receiving groove 302. The limiting structure is arranged between the outer peripheral wall of the rear cover 32 and the inner peripheral wall of the containing groove 302. When the rear cover 32 rotates to the first position relative to the supporting body 30, the rear cover 32 can move toward the bottom wall of the accommodating groove 302 to compress the elastic member 34 and make the abutting portion 321 contact the pressing member 2. When the rear cover 32 rotates to the second position relative to the supporting body 30, the limiting structure can prevent the rear cover 32 from moving toward the bottom wall of the accommodating groove 302.

Therefore, when an operator needs to press the rear cover 32 to disassemble and assemble the needle 8, the operator applies force to the rear cover 32 to rotate the rear cover 32, when the rear cover 32 rotates to the first position, the operator can press the rear cover 32 to enable the rear cover 32 to move towards the bottom wall of the accommodating groove 302, the elastic piece 34 is compressed until the propping part 321 contacts the pressing piece 2 and pushes and supports the pressing piece 2, after the needle 8 is disassembled and assembled, the rear cover 32 is released, so that the rear cover 32 moves towards the direction far away from the bottom wall of the accommodating groove 302 under the resilience of the elastic piece 34, and the propping part 321 is separated from the pressing piece 2; when the operator uses the dental handpiece after installing the needle 8, the operator applies force to the rear cover 32 to rotate the rear cover 32 to the second position, and the limiting structure can prevent the rear cover 32 from moving to the bottom wall of the accommodating groove 302, so that the supporting part 321 is prevented from contacting the pressing part 2 which rotates at a high speed, the temperature rise phenomenon of the rear cover 32 caused by frictional heating is avoided, and the human body can not be scalded.

As shown in fig. 3 to 5, the inner circumferential wall of the receiving groove 302 is provided with a circumferentially extending limiting groove 3021, and as shown in fig. 6, the outer circumferential wall of the rear cover 32 is provided with a circumferentially extending limiting protrusion 323. The limiting structure comprises a limiting groove 3021 and a limiting protrusion 323, namely the limiting groove 3021 and the limiting protrusion 323 jointly form the limiting structure.

Referring to fig. 2, when the rear cover 32 rotates to the first position relative to the supporting body 30, the limiting protrusion 323 is separated from the limiting groove 3021, so that the operator presses the rear cover 32 to move the rear cover 32 toward the bottom wall of the accommodating groove 302, so as to compress the elastic member 34 and make the abutting member contact the pressing member 2, thereby expanding the needle clamping elastic sheet 7, thereby enabling the needle 8 to be disassembled and assembled, after the needle 8 is disassembled and assembled, the operator releases the rear cover 32, the resilience of the elastic member 34 drives the rear cover 32 to move in a direction away from the bottom wall of the accommodating groove 302, so that the abutting portion 321 is separated from the pressing member 2, the needle clamping elastic sheet 7 is tightened, and the needle 8 is clamped.

When the back cover 32 rotates to the second position relative to the support 30, the limiting groove 3021 accommodates the limiting protrusion 323, so that in the using process of the dental handpiece, even if pressure is applied to the back cover 32 by careless and error touch, because the limiting protrusion 323 is arranged in the limiting groove 3021, the limiting protrusion 323 can be abutted against the inner side wall of the limiting groove 3021, thereby playing a role in preventing the back cover 32 from moving towards the bottom wall of the accommodating groove 302, and the abutting part 321 can not move to the position where the pressing member 2 rotating at a high speed is contacted, so that the phenomenon that the back cover 32 is heated due to frictional heat can not be generated.

The limiting structure comprises at least two limiting grooves 3021 and two limiting protrusions 323, the number of the limiting grooves 3021 is equal to the number of the limiting protrusions 323, the circumferential intervals of the limiting protrusions 323 are distributed on the outer circumferential wall of the rear cover 32, and the circumferential intervals of the limiting grooves 3021 are distributed on the inner side wall of the accommodating groove 302. When the rear cover 32 rotates to the first position relative to the supporting body 30, each limiting protrusion 323 is located between every two adjacent limiting grooves 3021, so that the rear cover 32 can move toward the bottom wall of the accommodating groove 302 by pressing the rear cover 32. When the rear cover 32 is rotated to the second position relative to the supporting body 30, each limiting groove 3021 accommodates one limiting protrusion 323, so that even if the rear cover 32 is accidentally mistaken to apply pressure to the rear cover 32, the rear cover 32 will not move toward the bottom wall of the accommodating groove 302. Moreover, the plurality of limiting grooves 3021 and the limiting protrusions 323 which are matched with each other are arranged, so that when the rear cover 32 is in the second position, the rear cover 32 is not inclined relative to the bottom wall of the accommodating groove 302 even if being stressed, and the abutting part 321 is better prevented from contacting the pressing piece 2.

The elastic member 34 may be a tubular elastic member such as a coil spring. The stopper projection 323 is located at the bottom of the outer peripheral wall of the rear cover 32. The inner peripheral wall of the accommodating groove 302 is provided with a first retaining protrusion 3023 and a second retaining protrusion 3025 which are spaced apart from each other, and the first retaining protrusion 3023 is far away from the bottom wall of the accommodating groove 302 relative to the second retaining protrusion 3025. The first latching protrusions 3023 surround the top of the inner circumference of the receiving groove 302, at least two second latching protrusions 3025 are provided, each second latching protrusion 3025 is circumferentially disposed at intervals at the bottom of the inner circumference of the receiving groove 302, and each second latching protrusion 3025 extends along the circumferential direction of the receiving groove 302. The first catching protrusion 3023 and each second catching protrusion 3025 together define at least two limiting grooves 3021. It should be noted that the number of the limiting groove 3021 and the number of the limiting protrusion 323 may be two or three, and the specific number is not limited in this embodiment.

A first guide inclined plane 3024 is arranged between the inner peripheral surface of the first retaining protrusion 3023 and the top surface of the first retaining protrusion 3023, and the first guide inclined plane 3024 forms an included angle with the inner peripheral surface of the first retaining protrusion 3023 and the top surface of the first retaining protrusion 3023. Second direction inclined plane 325 has between the bottom surface of spacing arch 323 and the outer peripheral face of spacing arch 323, and second direction inclined plane 325 all personally submits the contained angle with the bottom surface of spacing arch 323 and the periphery of spacing arch 323, first direction inclined plane 3024 and second direction inclined plane 325 looks adaptation to the cooperation on first direction inclined plane 3024 and second direction inclined plane 325 can make things convenient for spacing arch 323 card to go into in the storage tank 302, saves strength more, makes things convenient for the assembly of aircraft nose.

Of course, in other embodiments, the outer circumferential wall of the rear cover 32 may be provided with a circumferentially extending limiting groove 3021, and the inner circumferential wall of the receiving groove 302 may be provided with a circumferentially extending limiting protrusion 323, that is, one of the outer circumferential wall of the rear cover 32 and the inner circumferential wall of the receiving groove 302 is provided with a circumferentially extending limiting groove 3021, and the other of the outer circumferential wall of the rear cover 32 and the inner circumferential wall of the receiving groove 302 is provided with a circumferentially extending limiting protrusion 323. Correspondingly, when the number of the limiting grooves 3021 and the limiting protrusions 323 is two or more, each limiting groove 3021 is circumferentially provided at intervals on one of the outer circumferential wall of the rear cover 32 and the inner circumferential wall of the accommodating groove 302, and each limiting protrusion 323 is circumferentially provided at intervals on the other of the outer circumferential wall of the rear cover 32 and the inner circumferential wall of the accommodating groove 302.

In addition, the dental handpiece of the above embodiment may be applied to different oral medical instruments capable of cutting and grinding bone tissue of an oral cavity of a patient, such as an electric dental motor, a dental implanter, a dental preparation machine, and the like.

In summary, the supporting body 30 has a through hole 301 and an accommodating groove 302 communicating with each other, and the through hole 301 is used for penetrating the pressing member 2. The rear cover 32 is at least partially received in the receiving groove 302 and can rotate relative to the supporting body 30, wherein a top supporting portion 321 opposite to the through hole 301 is disposed on an inner side of a top wall of the rear cover 32. The elastic member 34 is abutted between the top wall of the rear cover 32 and the bottom wall of the receiving groove 302. The limiting structure is arranged between the outer peripheral wall of the rear cover 32 and the inner peripheral wall of the containing groove 302. When the rear cover 32 rotates to the first position relative to the supporting body 30, the rear cover 32 can move toward the bottom wall of the accommodating groove 302 to compress the elastic member 34 and make the abutting portion 321 contact the pressing member 2. When the rear cover 32 rotates to the second position relative to the supporting body 30, the limiting structure can prevent the rear cover 32 from moving toward the bottom wall of the accommodating groove 302.

Therefore, when an operator needs to press the rear cover 32 to disassemble and assemble the needle 8, the operator applies force to the rear cover 32 to rotate the rear cover 32, when the rear cover 32 rotates to the first position, the operator can press the rear cover 32 to enable the rear cover 32 to move towards the bottom wall of the accommodating groove 302, the elastic piece 34 is compressed until the propping part 321 contacts the pressing piece 2 and pushes and supports the pressing piece 2, after the needle 8 is disassembled and assembled, the rear cover 32 is released, so that the rear cover 32 moves towards the direction far away from the bottom wall of the accommodating groove 302 under the resilience of the elastic piece 34, and the propping part 321 is separated from the pressing piece 2; when the operator uses the dental handpiece after installing the needle 8, the operator applies force to the rear cover 32 to rotate the rear cover 32 to the second position, and the limiting structure can prevent the rear cover 32 from moving to the bottom wall of the accommodating groove 302, so that the supporting part 321 is prevented from contacting the pressing part 2 which rotates at a high speed, the temperature rise phenomenon of the rear cover 32 caused by frictional heating is avoided, and the human body can not be scalded.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A rear cover assembly, comprising:

the supporting body is provided with a through hole and an accommodating groove which are communicated, and the through hole is used for penetrating through the pressing piece;

the rear cover is at least partially accommodated in the accommodating groove and can rotate relative to the support body, and a jacking part opposite to the through hole is arranged on the inner side of the top wall of the rear cover;

the elastic piece is abutted between the top wall of the rear cover and the bottom wall of the accommodating groove;

the limiting structure is arranged between the outer peripheral wall of the rear cover and the inner peripheral wall of the accommodating groove;

when the rear cover rotates to a first position relative to the support body, the rear cover can move towards the bottom wall of the accommodating groove so as to compress the elastic piece and enable the jacking part to contact the pressing piece;

when the rear cover rotates to a second position relative to the support body, the limiting structure can prevent the rear cover from moving towards the bottom wall of the accommodating groove.

2. The rear cover assembly as claimed in claim 1, wherein one of the outer peripheral wall of the rear cover and the inner peripheral wall of the accommodating groove is provided with a circumferentially extending stopper groove, the other of the outer peripheral wall of the rear cover and the inner peripheral wall of the accommodating groove is provided with a circumferentially extending stopper projection, and the stopper structure comprises the stopper groove and the stopper projection;

when the rear cover rotates to the first position relative to the support body, the limiting protrusion is separated from the limiting groove;

when the rear cover rotates to the second position relative to the support body, the limiting groove is used for accommodating the limiting protrusion.

3. The rear cover assembly according to claim 2, wherein the limiting structure comprises at least two limiting grooves and two limiting protrusions, the number of the limiting grooves is equal to that of the limiting protrusions, each limiting groove is circumferentially arranged at intervals on one of the outer circumferential wall of the rear cover and the inner circumferential wall of the accommodating groove, and each limiting protrusion is circumferentially arranged at intervals on the other of the outer circumferential wall of the rear cover and the inner circumferential wall of the accommodating groove;

when the rear cover rotates to the first position relative to the support body, each limiting protrusion is positioned between every two adjacent limiting grooves;

when the rear cover rotates to the second position relative to the support body, each limiting groove is used for accommodating one limiting protrusion.

4. The rear cover assembly as claimed in claim 3, wherein the outer peripheral wall of the rear cover is provided with the circumferentially extending stopper protrusion, and the inner peripheral wall of the accommodating groove is provided with the circumferentially extending stopper groove.

5. The rear cover assembly as claimed in claim 4, wherein the stopper projection is located at a bottom of the outer peripheral wall of the rear cover.

6. The rear cover assembly as claimed in claim 4, wherein the inner peripheral wall of the accommodating groove is provided with a first retaining protrusion and a second retaining protrusion which are spaced apart from each other, and the first retaining protrusion is far away from the bottom wall of the accommodating groove relative to the second retaining protrusion;

the first clamping protrusions surround the top of the inner periphery of the accommodating groove, at least two second clamping protrusions are arranged, the second clamping protrusions are circumferentially arranged at intervals at the bottom of the inner periphery of the accommodating groove, and each second clamping protrusion extends along the circumferential direction of the accommodating groove;

the first clamping protrusions and the second clamping protrusions jointly enclose at least two limiting grooves.

7. The rear cover assembly as claimed in claim 6, wherein a first guiding inclined plane is provided between the inner peripheral surface of the first retaining protrusion and the top surface of the first retaining protrusion, and the first guiding inclined planes are both angled with respect to the inner peripheral surface of the first retaining protrusion and the top surface of the first retaining protrusion;

the bottom surface of the limiting bulge and the outer peripheral surface of the limiting bulge are provided with second guide inclined planes, the second guide inclined planes are respectively matched with the bottom surface of the limiting bulge and the outer peripheral surface of the limiting bulge to form included angles, and the first guide inclined planes are matched with the second guide inclined planes.

8. A handpiece of a dental handpiece, comprising:

the top end and the bottom end of the machine head shell are both open;

the rear cover assembly of any one of claims 1-7, wherein the support body is disposed at a top end of the handpiece housing, a side of the support body facing away from the handpiece housing is provided with the receiving groove, and the through hole is close to the handpiece housing relative to the receiving groove;

the pressing piece is rotatably arranged in the machine head shell, and one end of the pressing piece penetrates through the through hole and is spaced from the jacking part.

9. A dental handpiece comprising a handpiece according to claim 8.

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