CN208658787U - Pot cover and cooking apparatus - Google Patents

Abstract

The utility model discloses a kind of pot cover and cooking apparatus, pot cover includes: upper cover；Locking closure, locking closure are rotatably installed on upper cover and have lid teeth；Motor, motor are installed on upper cover and have motor shaft；One-way clutch bearing, one-way clutch bearing have outer ring and inner ring, and the inner ring of one-way clutch bearing, which connect with electric machine shaft driving and driven by motor shaft, to be rotated；Transmission component, transmission component cooperate with the outer ring of one-way clutch bearing and locking closure transmission respectively；Wherein, transmission component is configured to, the rotary motion of motor shaft is transferred to locking closure in electrical power, the transmission connection with motor shaft is disconnected so that the rotary motion of itself is transferred to locking closure by one-way clutch bearing in motor power-off, so that locking closure realizes forward and reverse rotation.Pot cover according to the present utility model is able to achieve automatic open close cover, also, light manual folding lid may be implemented under power blackout situation, easy to use.

Description

Pot cover and cooking apparatus

Technical field

The utility model relates to cooking apparatus technical fields, in particular to a kind of pot cover and with the pot cover Cooking apparatus.

Background technique

Cooking apparatus (for example, electric pressure cooking saucepan) in the related technology opens and closes pot cover usually by way of rotating handles. For example, being rotated in a clockwise direction handle first when uncapping, make the pot tooth dislocation point of the lid teeth and pot body of electric pressure cooker upper lid From, then lid-opening button is pressed, so that the fastening of upper cover and pot body unlocks, so realize the process of uncapping of electric pressure cooking saucepan；When closing lid, Upper cover is covered in pot body first, so that lid-opening button fastens upper cover and pot body, then is rotated in the counterclockwise direction handle, so that The lid teeth of upper cover and the pot tooth of pot body it is Chong Die locking, so realize electric pressure cooking saucepan closing lid process.

In this way, user, which needs to complete above-mentioned steps, could open and close pot cover when using electric pressure cooking saucepan, use is not convenient enough.And And in use, user needs to apply biggish turning moment to rotating handles, still, in the lesser handle of rotary volume When, user's rotation is very laborious；In the biggish handle of rotary volume, the rotary course of rotating handles needs biggish operation empty Between, so that the use to electric pressure cooking saucepan is made troubles.

Utility model content

The utility model aims to solve at least one of the technical problems existing in the prior art.For this purpose, the utility model mentions A kind of pot cover easy to use out.

The utility model also proposes a kind of cooking apparatus with the pot cover.

According to the pot cover of the utility model first aspect embodiment, comprising: upper cover；Locking closure, the locking closure are rotationally pacified Loaded on the upper cover and there is lid teeth；Motor, the motor are installed on the upper cover and have motor shaft；One-way clutch bearing, The one-way clutch bearing have outer ring and inner ring, the inner ring of the one-way clutch bearing connect with the electric machine shaft driving and by The motor shaft driving rotation；Transmission component, the transmission component respectively with the outer ring of the one-way clutch bearing and the lock Lid transmission cooperation；Wherein, the transmission component is configured to, and passes the rotary motion of the motor shaft in the electrical power Be handed to the locking closure, in motor power-off by the one-way clutch bearing disconnect with the transmission connection of the motor shaft with The rotary motion of itself is transferred to the locking closure, so that the locking closure realizes forward and reverse rotation.

According to the pot cover of the utility model embodiment, automatic rotation locking closure is able to achieve to realize automatic open close cover, also, It is easy to use without overcoming the power of motor or manually connecting battery and can easily realize manual folding lid under power blackout situation.

In addition, also there is following additional technical characteristic according to the pot cover of the utility model embodiment:

Some embodiments according to the present utility model, the transmission component include: the first driving member, first driving member Rotationally it is sheathed on the outer ring of the one-way clutch bearing；Second driving member, second driving member and first transmission Part transmission connection；Catenating slider, the catenating slider be rotatably installed on the upper cover and respectively with second driving member It is sequentially connected with the locking closure.

Further, one in first driving member and second driving member is equipped with first shaft hole and another sets There is the first rotating shaft being rotatably engaged in the first shaft hole.

In some embodiments of the invention, first driving member is annular and is equipped with centre bore, the one-way clutch Bearing is set in the centre bore, and the first rotating shaft is located at the upper surface of first driving member, second driving member One end be equipped with the first shaft hole.

Optionally, one in second driving member and the catenating slider be equipped with the second axis hole and another be equipped with can The second shaft being rotatably fitted in second axis hole.

In some embodiments of the invention, one end of the catenating slider be equipped with second shaft, it is described The other end of catenating slider is equipped with the adaptation groove connecting with the locking closure, is equipped with rotationally between the both ends of the catenating slider It is installed on the mounting portion of the upper cover.

Further, the upper lid is equipped with annular convex platform, and the mounting portion is hollow annular bead, the convex annular Circle is rotatably sleeved on the annular convex platform.

In some embodiments of the utility model, the catenating slider be equipped with adaptation groove, the locking closure be equipped with it is described The pillar of adaptation groove cooperation, the upper cover are equipped with the first arc groove, and the center of circle of first arc groove is located at turning for the locking closure In shaft line, the pillar is slidably fit into first arc groove, and the pillar is equipped with support edge, and the pillar is worn It crosses first arc groove and support edge is hooked in the catenating slider.

Advantageously, the upper cover is equipped with multiple second arc grooves, and the center of circle of second arc groove is located at the locking closure On pivot center, the locking closure is equipped with the circumferential direction etc. of multiple positioning columns, multiple positioning columns and the pillar along the locking closure Spacing setting, multiple positioning columns pass through multiple second arc grooves correspondingly and are hooked in the upper cover respectively.

In some specific embodiments of the utility model, the motor shaft extends along the vertical direction and the catenating slider Horizontally extending, the motor and the catenating slider interval are arranged.

Some embodiments according to the present utility model, the upper cover are equipped with the manual handle being connected with the transmission component, The manual handle is used to drive the transmission component to rotate in motor power-off.

According to the cooking apparatus of the utility model second aspect embodiment, comprising: pot body, the pot body have pot tooth；Root According to pot cover described in the utility model first aspect embodiment, the pot cover is set to the pot body, the locking closure by positive and Rotating backward makes the lid teeth and the pot tooth fasten and be detached from.

Automatic rotation is able to achieve by utilizing pot cover as described above according to the cooking apparatus of the utility model embodiment Locking closure is to realize automatic open close cover, also, under power blackout situation, without overcome the power of motor or connect battery manually can be light Pine nut shows manual folding lid, easy to use.

The additional aspect and advantage of the utility model will be set forth in part in the description, partially will be from following description In become obvious, or recognized by the practice of the utility model.

Detailed description of the invention

Fig. 1 is the explosive view according to the pot cover of the utility model embodiment；

Fig. 2 is the structural schematic diagram according to the pot cover of the utility model embodiment；

Fig. 3 is the structural schematic diagram according to the pot cover of the utility model embodiment；

Fig. 4 is the structural schematic diagram according to the pot cover of the utility model embodiment；

Fig. 5 is the structural schematic diagram according to the pot cover of the utility model embodiment；

Fig. 6 is the explosive view of motor according to the utility model embodiment, one-way clutch bearing and transmission component；

Fig. 7 is the structural schematic diagram according to the cooking apparatus of the utility model embodiment.

Appended drawing reference:

Cooking apparatus 1,

Pot cover 10,

Upper cover 100, the first arc groove 101, the second arc groove 102, annular convex platform 103,

Locking closure 200, lid teeth 201, pillar 210, support is along 211, positioning column 220,

Motor 300, motor shaft 301,

One-way clutch bearing 400,

Transmission component 500, the first driving member 510, first rotating shaft 511, the second driving member 520, first shaft hole 521, second Axis hole 522, catenating slider 530, the second shaft 531, adaptation groove 532, mounting portion 533,

Pot body 20.

Specific embodiment

The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model Limitation.

Below with reference to the accompanying drawings pot cover 10 according to the utility model first aspect embodiment is described.For example, pot cover 10 can be with For electric pressure cooking saucepan.

As shown in Fig. 1-Fig. 7, according to the pot cover 10 of the utility model embodiment, comprising: upper cover 100, locking closure 200, motor 300, one-way clutch bearing 400 and transmission component 500.

Specifically, locking closure 200 is rotatably installed on upper cover 100, and locking closure 200 has a lid teeth 201, lid teeth 201 with The pot tooth of pot body cooperates.Here, locking closure 200 can be retainer, be also possible to metal cover.Motor 300 is installed on upper cover 100, and Motor 300 has motor shaft 301.One-way clutch bearing 400 has outer ring and inner ring, the inner ring and electricity of one-way clutch bearing 400 Arbor 301 is sequentially connected, and inner ring is driven by motor shaft 301 and rotated.Transmission component 500 respectively with one-way clutch bearing 400 Outer ring and the transmission cooperation of locking closure 200.

Wherein, transmission component 500 is configured to, and the rotary motion of motor shaft 301 is transferred to lock when motor 300 is powered Lid 200 is disconnected with the transmission connection of motor shaft 301 by one-way clutch bearing 400 with by the rotation of itself when motor 300 is powered off Transhipment is dynamic to be transferred to locking closure 200, so that locking closure 200 realizes forward and reverse rotation.

In other words, when motor 300 is powered, motor shaft 301 drives the rotation of 400 inner ring of one-way clutch bearing, and inner ring will Power passes to transmission component 500, and transmission component 500 imparts power to locking closure 200 again, thus drive locking closure 200 positive and It rotates backward；When motor 300 powers off, transmission component 500 is rotated, and imparts power to locking closure 200, to drive locking closure 200 Forward and reverse rotation, meanwhile, transmission component 500 drives the outer ring rotating of one-way clutch bearing 400, and due to one-way clutch axis Inner ring rotation is not will drive when holding 400 outer ring rotating, it is thereby achieved that the separation of outer ring and motor shaft 301, that is, outer ring It not will drive the rotation of motor shaft 301, there is no need to overcome the torque of motor 300, realize easily manual folding lid yet.

Here it is possible to which lid teeth 201 and pot tooth fasten when being that locking closure 200 rotates forward；When locking closure 200 rotates backward, lid teeth 201 are disengaged from each other with pot tooth.It is of course also possible to which lid teeth 201 and pot tooth fasten when being that locking closure 200 rotates backward；Locking closure 200 is just To when rotation, lid teeth 201 is disengaged from each other with pot tooth.Wherein, rotating forward for locking closure 200 can be defined as along clockwise direction It rotates, rotate backward the rotation that can be defined as in the counterclockwise direction.Fig. 4 shows the pot cover according to the utility model embodiment Uncapped state；Fig. 5 shows the closing lid state according to the pot cover of the utility model embodiment.

It should be noted that " unidirectional " of one-way clutch bearing 400 refer to inner ring can only one direction transmitting power, example Such as, when setting motor shaft 301 is rotated in the clockwise direction, the inner ring of one-way clutch bearing 400 is also rotated in the clockwise direction, interior Circle drives outer ring to be rotated in the clockwise direction, in this way, when motor shaft 301 rotates in the counterclockwise direction, one-way clutch bearing 400 Inner ring also rotate in the counterclockwise direction, still, inner ring cannot drive outer ring rotating at this time, cannot transmit power.

In addition, when motor shaft 301 does not rotate (inner ring of one-way clutch bearing 400 does not also rotate), one-way clutch bearing 400 outer ring can be rotated along driving direction, but cannot be rotated along the direction opposite with driving direction.Here, it drives Direction refers to above-mentioned clockwise direction (that is, inner ring can be with rotation direction of outer ring rotating).

According to the pot cover 10 of the utility model embodiment, automatic open close cover may be implemented, also, be not necessarily under power blackout situation Overcome the power of motor 300 or manual folding lid can easily be realized by connecting battery manually, thus easy to use.

Some embodiments according to the present utility model, upper cover 100 are equipped with the manual handle being connected with transmission component 500, hand Dynamic handle is used for the driving transmission component 500 when motor 300 powers off and rotates.In this way, facilitating user's manual folding lid when power is off.

Some embodiments according to the present utility model, as shown in figs 1 to 6, transmission component 500 include: the first driving member 510, the second driving member 520 and catenating slider 530.First driving member 510 is rotationally sheathed on the outer of one-way clutch bearing 400 Circle.Second driving member 520 and the first driving member 510 are sequentially connected.Catenating slider 530 is rotatably installed on upper cover 100, and joins Movable slider 530 is sequentially connected with the second driving member 520 and locking closure 200 respectively.Wherein, the first driving member 510 is made unidirectional whole Week rotation.

In this way, motor shaft 301 rotates and the inner ring of one-way clutch bearing 400 is driven to rotate, inner ring when motor 300 is powered Outer ring rotating is driven when rotation, then, outer ring is cooperated by the transmission of the first driving member 510 and the second driving member 520 by power It is transmitted on catenating slider 530, rotates catenating slider 530, drive locking closure 200 to rotate when catenating slider 530 rotates.

When motor 300 powers off, user can carry out folding lid manually, for example, manual handle and catenating slider 530 or the first Driving member 510 is connected, and user rotates catenating slider 530 by rotation manual handle, at this point, catenating slider 530 drives unidirectionally The outer ring rotating of Engaging-and-disengaging bearing 400, and due to not will drive inner ring rotation when the outer ring rotating of one-way clutch bearing 400, The separation of outer ring Yu motor shaft 301 may be implemented, that is, outer ring not will drive the rotation of motor shaft 301, and also there is no need to overcome motor 300 torque realizes light folding lid.

Further, as shown in fig. 6, one in the first driving member 510 and the second driving member 520 is equipped with first shaft hole 521, another in the first driving member 510 and the second driving member 520 is equipped with the be rotatably engaged in first shaft hole 521 One shaft 511.For example, the first driving member 510 be annular, the first driving member 510 be equipped with centre bore, 400 sets of one-way clutch bearing It is located in the centre bore of the first driving member 510；Second driving member 520 is rod piece, and the upper surface of the first driving member 510 is equipped with the One end of one shaft 511, the second driving member 520 is equipped with first shaft hole 521.Wherein, manual handle can be with 511 phase of first rotating shaft Connect, so as to drive the first driving member 510 to rotate when power is off.

Optionally, as shown in fig. 6, one in the second driving member 520 and catenating slider 530 is equipped with the second axis hole 522, the In two driving members 520 and catenating slider 530 another be equipped be rotatably engaged the second shaft in the second axis hole 522 531.For example, the other end of the second driving member 520 is equipped with the second axis hole 522, one end of catenating slider 530 is equipped with the second shaft 531。

In some embodiments of the utility model, as shown in figs 1 to 6, the other end of catenating slider 530 is equipped with adaptation Slot 532, locking closure 200 are equipped with the pillar 210 cooperated with adaptation groove 532, are equipped between the both ends of catenating slider 530 and rotationally pacify Mounting portion 533 loaded on upper cover 100, in this way, pillar 210 is embedded in adaptation groove 532, to transmit power, catenating slider 530 is rotated When, mounting portion 533 is used as rotating fulcrum, 200 forward and reverse of locking closure can be driven to rotate by the fit structure.For example, convex Column 210 is cylindrical, and adaptation groove 532 is U-shaped.

Advantageously, as shown in Figure 1, upper cover 100 is equipped with annular convex platform 103, mounting portion 533 is hollow annular bead, Annular bead is rotatably sleeved on annular convex platform 103, to be conducive to the smooth rotation of catenating slider 530.

Further, shown in as shown in Figure 1, Figure 2, Fig. 4 and Fig. 5, upper cover 100 is equipped with the first arc groove 101, the first arc groove 101 center of circle is located on the pivot center of locking closure 200, and pillar 210 is slidably fit into the first arc groove 101.In this way, connection When movable slider 530 drives pillar 210 to move, the first arc groove 101 can limit the movement of pillar 210, make pillar 210 first Sliding in arc groove 101, to realize the rotation of locking closure 200.

Further, as depicted in figs. 1 and 2, pillar 210 is equipped with support along 211, and pillar 210 passes through the first arc groove 101, and support and along 211 be hooked in catenating slider 530, so that pillar 210 can slide in the first arc groove 101 and will not be from Deviate from first arc groove 101.For example, support is configured to circle along 211.

Advantageously, shown in as shown in Figure 1, Figure 2, Fig. 4 and Fig. 5, upper cover 100 is equipped with the second arc groove 102, the second arc groove 102 The center of circle be located on the pivot center of locking closure 200, locking closure 200 be equipped with positioning column 220, positioning column 220 pass through the second arc groove 102, and positioning column 220 is hooked in upper cover 100, so as to guide locking closure 200 to make around the center axis thereof of upper cover 100 The rotation of locking closure 200 is more steady, smooth.Wherein, positioning column 220 is cylindrical, and the top of positioning column 220 is configured to directly Diameter is greater than the circle of the width of the second arc groove 102, to prevent positioning column 220 from deviating from from the second arc groove 102.

More advantageously, as Figure 1-Figure 5, positioning column 220 is multiple, and multiple positioning columns 220 and pillar 210 are along locking closure 200 circumferential spaced set, the second arc groove 102 be it is multiple, multiple positioning columns 220 correspondingly pass through multiple second arcs Shape slot 102, and multiple positioning columns 220 are hooked in upper cover 100 respectively.

In some specific embodiments of the utility model, motor shaft 301 extends along the vertical direction and 530 edge of catenating slider Horizontal direction extends, and motor 300 and the interval of catenating slider 530 are arranged.Advantageously, the pivot center and locking closure of catenating slider 530 200 pivot center is overlapped.

As shown in Fig. 1-Fig. 7, according to the cooking apparatus 1 of the utility model second aspect embodiment, including pot body 20 and root According to pot cover 10 described in the utility model first aspect embodiment.For example, cooking apparatus 1 is electric pressure cooking saucepan.

Specifically, pot body 20 has pot tooth.Pot cover 10 is set to pot body 20, and locking closure 200 is made by forward and reverse rotation Lid teeth 201 and pot tooth are fastened and are detached from.For example, lid teeth 201 and pot tooth fasten when locking closure 200 rotates forward；Locking closure 200 is reversed When rotation, lid teeth 201 is disengaged from each other with pot tooth.It is of course also possible to when being that locking closure 200 rotates backward, lid teeth 201 and pot tooth button It closes；When locking closure 200 rotates forward, lid teeth 201 is disengaged from each other with pot tooth.Wherein, rotating forward for locking closure 200 can be defined as edge Clockwise rotation rotates backward the rotation that can be defined as in the counterclockwise direction.

It is able to achieve by utilizing pot cover 10 as described above from turn according to the cooking apparatus 1 of the utility model embodiment Locking closure 200 is moved to realize automatic open close cover, also, under power blackout situation, without overcoming the power of motor 300 or manually connecting battery It can easily realize manual folding lid, it is easy to use.

According to other compositions of the cooking apparatus 1 of the utility model embodiment and operate for ordinary skill people Member for be all it is known, be not detailed herein.

In the description of the present invention, it should be understood that term " center ", " width ", "upper", "lower", "vertical", The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside", " clockwise ", " counterclockwise ", " circumferential direction " is base In orientation or positional relationship shown in the drawings, be merely for convenience of describing the present invention and simplifying the description, rather than indicate or It implies that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as Limitations of the present invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " multiple " It is two or more.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary, It can also be the connection inside two elements.For the ordinary skill in the art, can be understood with concrete condition above-mentioned The concrete meaning of term in the present invention.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " specific embodiment ", " can Select embodiment ", the description of " example " or " some examples " etc. mean specific features described in conjunction with this embodiment or example, knot Structure, material or feature are contained at least one embodiment or example of the utility model.In the present specification, to above-mentioned art The schematic representation of language may not refer to the same embodiment or example.Moreover, description specific features, structure, material or Person's feature can be combined in any suitable manner in any one or more of the embodiments or examples.

While there has been shown and described that the embodiments of the present invention, it will be understood by those skilled in the art that: These embodiments can be carried out with a variety of variations, modification, replacement in the case where not departing from the principles of the present invention and objective And modification, the scope of the utility model are defined by the claims and their equivalents.

Claims (12)

1. a kind of pot cover characterized by comprising

Upper cover；

Locking closure, the locking closure are rotatably installed on the upper cover and have lid teeth；

Motor, the motor are installed on the upper cover and have motor shaft；

One-way clutch bearing, the one-way clutch bearing have outer ring and inner ring, the inner ring of the one-way clutch bearing with it is described Electric machine shaft driving, which is connected and driven by the motor shaft, to be rotated；

Transmission component, the transmission component cooperate with the outer ring of the one-way clutch bearing and locking closure transmission respectively；

Wherein, the transmission component is configured to, and the rotary motion of the motor shaft is transferred to institute in the electrical power State locking closure, in motor power-off by the one-way clutch bearing disconnect with the transmission connection of the motor shaft with by itself Rotary motion be transferred to the locking closure so that the locking closure realize forward and reverse rotation.

2. pot cover according to claim 1, which is characterized in that the transmission component includes:

First driving member, first driving member are rotationally sheathed on the outer ring of the one-way clutch bearing；

Second driving member, second driving member and first driving member are sequentially connected；

Catenating slider, the catenating slider be rotatably installed on the upper cover and respectively with second driving member and the lock Lid transmission connection.

3. pot cover according to claim 2, which is characterized in that one in first driving member and second driving member It is a equipped with first shaft hole and another be equipped with the first rotating shaft that is rotatably engaged in the first shaft hole.

4. pot cover according to claim 3, which is characterized in that first driving member is annular and is equipped with centre bore, institute It states one-way clutch bearing to be set in the centre bore, the first rotating shaft is located at the upper surface of first driving member, described One end of second driving member is equipped with the first shaft hole.

5. pot cover according to claim 2, which is characterized in that one in second driving member and the catenating slider Equipped with the second axis hole and another be equipped be rotatably engaged the second shaft in second axis hole.

6. pot cover according to claim 5, which is characterized in that one end of the catenating slider is equipped with and described second turn Axis, the other end of the catenating slider are equipped with the adaptation groove connecting with the locking closure, are equipped between the both ends of the catenating slider It is rotatably installed on the mounting portion of the upper cover.

7. pot cover according to claim 6, which is characterized in that the upper lid is equipped with annular convex platform, and the mounting portion is Hollow annular bead, the annular bead are rotatably sleeved on the annular convex platform.

8. pot cover according to claim 2, which is characterized in that the catenating slider is equipped with adaptation groove, and the locking closure is equipped with With the pillar of adaptation groove cooperation, the upper cover is equipped with the first arc groove, and the center of circle of first arc groove is located at the lock On the pivot center of lid, the pillar is slidably fit into first arc groove, and the pillar is equipped with support edge, described Pillar passes through first arc groove and support edge is hooked in the catenating slider.

9. pot cover according to claim 8, which is characterized in that the upper cover be equipped with multiple second arc grooves, described second The center of circle of arc groove is located on the pivot center of the locking closure, the locking closure be equipped with multiple positioning columns, multiple positioning columns and For the pillar along the circumferential spaced set of the locking closure, multiple positioning columns pass through multiple second arcs correspondingly Shape slot and it is hooked in the upper cover respectively.

10. pot cover according to claim 2, which is characterized in that the motor shaft extends along the vertical direction and the linkage Sliding block is horizontally extending, and the motor and the catenating slider interval are arranged.

11. pot cover according to claim 1 to 10, which is characterized in that the upper cover is equipped with and the transmission group The connected manual handle of part, the manual handle are used to drive the transmission component to rotate in motor power-off.

12. a kind of cooking apparatus characterized by comprising

Pot body, the pot body have pot tooth；

According to claim 1, pot cover described in any one of -11, the pot cover are set to the pot body, and the locking closure passes through forward direction The lid teeth and the pot tooth is set to fasten and be detached from rotating backward.