389results about How to "Won't come out" patented technology

The invention provides a lithium battery positive electrode material and a preparation method thereof. The preparation method of the lithium battery positive electrode material comprises the following steps: S1. pumping a solution A and an alkali solution into a reaction vessel at a constant speed to carry out co-precipitation reaction; S2. pumping a solution B into the solution A at the constant speed while performing the step S1, and drying after the reaction is ended to obtain a precursor; S3. mixing and firing the precursor with lithium salt. In the solution A, a mole ratio of Ni to Co to Mn is (1-2x):x:x, and x is greater than 0 and less than or equal to 0.25. In the solution B, a mole ratio of Ni to Co to Mn is (1-2y):y:y, and y is greater than or equal to 0.25 and less than 0.5; the solution A is different from the solution B; the alkali solution is an aqueous solution which contains a precipitating agent and a complexing agent; the precipitating agent is selected from one or more of water-soluble hydroxides; the complexing agent is ammonia water. The lithium battery positive electrode material has the advantages of high capacity, high heat stability, high cycle performance, high electrochemical performance and low cost.

The invention discloses a forming mold and a forming method of a fiber reinforced composite material grid rib. The forming mold comprises a bottom mold, filling molds, compression strips and positioning clamps. The forming method comprises the steps of spreading fiber tows on the mold in longitude and latitude directions to form a fiber grid, and carrying out vacuumizing by virtue of a vacuum mold pressing technique so as to finish dipping and curing forming of the fiber grid. According to the forming mold and the forming method, the fiber reinforced composite material grid rib with any grid size can be fabricated according to the requirement, has a precise size and is stable in performance, and the machining process is environmentally friendly, is easy to handle and is suitable for industrial batch production.

The invention relates to a crown spring cage tyep pin and jack component and a jack thereof. the crown spring cage tyep jack comprises an inner sleeve, wherein an outer sleeve is sleeved outside the inner sleeve, a crown spring penetrates through the inner bore of the inner sleeve; two parallel elastic clamping strips are symmetrically arranged on the port part of the inner bore of the outer sleeve; and the distance between the two elastic clamping strips is less than the minimum internal diameter of the crown spring. The crown spring cage tyep pin and jack component comprises a pin and a jack, wherein the jack contains the inner sleeve; the outer sleeve is sleeved outside the inner sleeve, the crown spring penetrates through the inner bore of the inner sleeve; the two parallel elastic clamping strips are symmetrically arranged on the port part of the inner bore of the outer sleeve, the distance between the two elastic clamping strips is less than the internal diameter of the crown spring; and the pin contains a needle-like connection-peg, and the circumference surface of the needle-like connection-peg is provided with a clamping structure which fits with the two elastic clamping strips in a clamping manner. The elastic clamping strips are arranged on the port part of the jack; and during plugging, the clamping structure on the pin fits with the elastic clamping strips in the clamping manner, thus the reliable plugging of the pin and the jack can be realized and the pin is difficult to separate from the jack.

The invention relates to a synthesis method of polyether polyalcohol with low unsaturation degree and high molecular weight, which is characterized in that the polyether polyalcohol is synthesized by adopting the following steps of: carrying out catalytic reaction of a polyalcohol compound used as an initiating agent under the catalysis of two different catalysts of alkali metal hydroxide catalyst and bimetal cyanogen compound catalyst under the pressure of 0-0.5MPa and at the temperature of 50-150 DEG C, and carrying out polymerization with an epoxy compound. The prepared product has high molecular weight, narrow distribution, and quite high tensile tear strength and elongation at break under the lower hardness; in the production process, bifunctional polyalcohol can not be removed together with water, thereby not influencing the design flow; the prepared polyether polyalcohol can be used for producing foams with high rebound and good processability and does not reduce other physical properties of the foams; and the polyether polyalcohol can be applied to polyurethane products of sealant, paving materials, waterproof materials, and the like and has favorable property especially on the aspects of shock absorption and waterproofing of rapid transit railways.

The invention provides a lithium battery cathode material and a preparation method thereof. The preparation method comprises the following steps: S1, performing coprecipitation reaction on a solution A and an alkali solution for 5-25 h; S2, pumping a solution B into the solution A at a constant speed, and continuing to perform coprecipitation reaction on the whole mixed solution and the alkali solution when the solution B is pumped; S3, continuing to perform coprecipitation reaction on a solution C and the alkali solution, and drying the obtained precursor after the reaction is terminated; and S4, mixing the precursor with a lithium salt, and sintering to obtain the lithium battery cathode material. The molar ratio of Ni, Co and Mn in the solution A is equal to (1-2x):x:x, and 0<x<=0.25; the molar ratio of Ni, Co and Mn in the solution B is equal to (1-2y):y:y, and 0.25<=y<0.5; and the solution C is an aqueous solution of a cobalt salt. The provided lithium battery cathode material has the advantages of high capacity, high heat stability, high cycle performance, high electrochemical performance and low cost, and has the first efficiency up to 92% or more.

The invention provides a side button mounting structure of electronic equipment. The side button mounting structure comprises a side button, a button mounting hole and an elastic compression component, wherein the button mounting hole is formed in the side end of a shell of the electronic equipment; the side button is arranged in the button mounting hole; the elastic compression component is arranged on the side end of the shell, is close to the position of the button mounting hole and comprises a fixing part and a pressing part which is connected with the fixing part; the fixing part is connected and fixed to the side end of the shell; the pressing part is bent to go into the button mounting hole and is connected to the side button. The side button mounting structure provided by the invention is provided with the elastic compression component and is connected and fixed to the side end of the shell through the fixing part of the elastic compression component, and the pressing part of the elastic compression component is bent to go into the button mounting hole and is connected to the side button, so that the button is enabled not to come off outwards, certain pressing elasticity of two ends of the side button is also guaranteed, and the problem that a side button of electronic equipment swings and gives abnormal noise in the prior art is better solved. The invention also provides the electronic equipment.

The invention relates to a car hand transmission grade-position locking arrangement, which consists of telescoping lockpin system on the transmission case and shift rotation shaft within stopping linked system, wherein the telescoping lockpin system mates the stopping linked system on the transmission shaft, which is set on the transmission case corresponding to the stopping linked system. The arrangement is easy to reequip and operate, which contains high reliability and simple structure.

The invention provides a hidden fan. The hidden fan comprises a drive motor, a fixed shaft and an outer rotor. The hidden fan further comprises a rotary disc and a fan blade assembly. The fan blade assembly comprises fan blades and a fan blade gear. The fan blade gear is fixedly connected with the fan blades rotating along with rotation of the fan blade gear. The fan blades are unfolded or foldedrelative to the rotary disc. A position blocking mechanism is arranged between a drive gear and the rotary disc, and by means of the position blocking mechanism, when the drive gear rotates along withrotation of the outer rotor, the rotary disc and the drive gear are firstly staggered by a certain angle relatively and then synchronously rotate, and thus the fan blades are unfolded relative to therotary disc and then fixed relative to the rotary disc. A reset spring is further arranged between the drive gear and the rotary disc, and by means of the reset spring, when the drive gear stops rotating, the rotary disc is pulled to rotate relative to the drive gear to be reset, and thus the fan blades are folded relative to the rotary disc. The design structure is simple and compact, assembly is easy, space occupation can be reduced through folding of the fan blades, and the hidden fan looks attractive.

The invention discloses a net cover structure of an engineering air bag. The movable net cover structure is formed by longitudinal hanging bands 2 and transverse hanging bands 5. The transverse hanging bands 5 penetrate through inner holes of rubber pipes 4 and fixing holes in the longitudinal hanging bands 2 to realize even distribution and limiting, on the circumference of a bag body, of the longitudinal hanging bands 2 in the circumferential direction. The two ends, located on the air bag 1, of each longitudinal hanging band 2 are provided with hanging lugs, the other end of each longitudinal hanging band 2 is located in the middle of the bag body and longitudinal tensioning of the longitudinal hanging bands 2 is realized by winding rope 5 in a crossed mode. The net cover structure can be fixedly bonded on an air bag with any diameter, and multi-point bearing binding of lateral floating force when the air bag is placed horizontally and single-point bearing binding of axial floating force when the air bag is placed longitudinally are realized. The net cover structure can be installed, disassembled and transported on the air bag easily, and the problem that floating-assisting binding cannot be conducted on large-diameter air bags is solved. The net cover structure is reasonable in stress, improves the construction safety, is high in reutilization rate, reduces construction investment and has wide application prospects in the fields such as ocean engineering construction and boat fishing.

The invention relates to an adjusting and locking mechanism of a steering column. The adjusting and locking mechanism of the steering column is composed of an adjusting handle with a long bolt, a cam I, a cam II, an n-shaped support, a press block, a thrust bearing, a nut and the like, wherein the cam I and the cam II are matched. The adjusting and locking mechanism of the steering column further comprises an axial spring arranged between the press block and the thrust bearing. According to the technical scheme, an interval generated when the steering column is adjusted is controllable, and therefore a slide block of the cam II is prevented from being disengaged from a sliding chute and losing efficacy.

The invention relates to a drying device of Chinese herbal pieces, in particular to a multi-layer mesh belt type drying device which is simple in structure, uniform in heating, fast in drying speed, high in production efficiency and high in heat utilization rate. The multi-layer mesh belt type drying device comprises a drying box (3), a material feeding inlet (6), material discharging outlets (7), a first conveyor belt (5), a second conveyor belt (10), a third conveyor belt (11), a fourth conveyor belt (12), a fifth conveyor belt (13) and humidity outlets (4), wherein the material feeding inlet (6) is arranged at one side of the drying box (3), the material discharging outlets (7) are arranged at the lower part of the drying box (3), the first conveyor belt (5), the second conveyor belt (10), the third conveyor belt (11), the fourth conveyor belt (12) and the fifth conveyor belt (13) are arranged in the drying box (3), and the humidity outlets (4) are connected to the upper part of the drying box (3); the inner wall of the drying box (3) is provided with a far-infrared heating device (8), the material feeding inlet (6) is connected with a protection cover (9), and the inner part of the protection cover (9) is provided with a conveying device (2); the lower side of the protection cover (9) and the outer side of the drying box (3) are connected with an electric control cabinet (1). The multi-layer mesh belt type drying device disclosed by the invention has the beneficial effects that the structure is simple, the heating is uniform, the drying speed is fast, the production efficiency is high, and the heat utilization rate is high.

The invention relates to the technical field of medical instruments and discloses a clamper for repairing valve leaflet. According to the clamper for repairing the valve leaflet, a locking assembly isdriven to move back and forth by a push-pull actuating rod to enable a main body frame to be inserted into or separated from a first through groove, simultaneously a first clamping elastic piece anda second clamping elastic piece can have elastic deformation to clamp the position to be clamped on the valve leaflet, and after the valve leaflet is clamped by the first clamping elastic piece and the second clamping elastic piece, outward expanding of the first clamping elastic piece can also be limited by utilizing the two opposite side walls of the first through groove, and it is ensured thatthe valve leaflet clamped between the first clamping elastic piece and the second clamping elastic piece does not fall out. Compared with an existing clamper, the clamper for repairing the valve leaflet has fewer parts, is simple in structure and convenient to operate, the operation time is shortened, and the clamping stability of the valve leaflet is enhanced.

The invention provides a household appliance and a door assembly thereof. The door assembly comprises a door plate and a door handle, wherein a handle groove used for containing the door handle is formed in the door plate, the door handle is arranged at the handle groove, is matched with the shape of the handle groove and can move back and forth relative to the door plate so as to extend out of orretract into the handle groove. According to the door assembly, the handle groove is formed in the door plate, the door handle is movably arranged at the handle groove, the door handle can retract into the handle groove when not being used, so that the effect of hiding the door handle is achieved, the whole door board is smooth, attractive and elegant, and the attractiveness of the product is improved; meanwhile, the phenomenon that a user can be easily scratched due to the fact that the two ends of certain door handles are protruded in the prior art is also avoided, and the use experience ofthe user is improved; and when the door handle needs to be used, the door handle can extend out of the handle groove so as to protrude out of the surface of the door plate, it is guaranteed that theuser can hold the door handle by hand to carry out door opening, door closing and the like, so that the corresponding functions of the door handle is realized.

The invention relates to automobile accessories, in particular to an on-board flowerpot. A plurality of vent holes are formed in the side wall of a base, and external air can flow into a water storage chamber through the vent holes, so that water accumulated in the water storage chamber can be evaporated rapidly and water in the water storage chamber is prevented from deteriorating and smelling. As the depth of a container is one half larger than the height of the flowerpot body, the flowerpot body can be fixed to the base only by being placed into the container; the flowerpot body cannot be released from the container when an automobile body vibrates due to the fact that the depth of a container is one half larger than the height of the flowerpot body. Therefore, the flowerpot body and the base can be connected conveniently.

The invention provides a four-bit embedded glass curtain window system. The system consists of a section frame, glass and an open window, wherein an upright column and a cross beam are embedded in a cross beam through a double T-shaped cross beam supported bracket to form the section frame of the curtain wall, and the section frame is connected with a main structure through a steel switching part; the cross beam and the upright column section are separated into a plurality of separated components; the double T-shaped embedded cross beam supported bracket is embedded in a cross beam cavity, and is fixed on the upright column; an open hinge slot is arranged on an opening frame, and a hinge shaft on an opening sash is embedded in the hinge slot; the opening sash is separated into an opening sash body which is subject to surface spray treatment and a glass adhesive stick which is subject to surface anodic oxidation treatment; and the glass adhesive stick is embedded and clamped in a section slot of the opening sash body. By the adoption of the four-bit embedded glass curtain window system, the assembly quality of a curtain wall plate and the safety of a curtain wall component are improved; inside assembly of glass can be realized, dependency on scaffolds, construction baskets and other devices and facilities is reduced, and the glass can be changed conveniently in assembling and daily maintaining processes.

The invention relates to a sliding frame, in particular to a multifunctional guide sliding frame, mainly comprising a sliding frame rod and a multifunctional guide pulley, wherein the sliding frame rod and the multifunctional guide pulley are two independent parts; the lower frame body of the multifunctional guide pulley is arranged on a frame rod of the sliding frame rod; and the sliding frame rod and the multifunctional guide pulley are in clearance fit. The multifunctional guide sliding frame in the invention can greatly lower friction resistance in cable laying, and rapidly and conveniently finish the field adjustment requirement of large weight cable laying, thus improving laying quality and efficiency; compared with the traditional plastic sliding frame, the multifunctional guide pulley can conveniently and rapidly move on the sliding rod from left to right so as to regulate the optimal entering position to a well head; and the sliding frame can rotate 180 degrees at a fixed point for fixing so as to regulating the optimal position of the cable laying.

The invention discloses a hanger of an anti-falling rope and a tower with an anti-falling device. The hanger is provided with a spiral tube made of rods. The size of a gap between each two adjacent rings of the spiral tube is larger than the minimum transverse size of the anti-falling rope, and the internal transverse size of the spiral tube corresponds to the transverse size of the anti-falling rope. A row of hangers of the anti-falling rope is distributed on the tower from bottom to top, the hangers are provided with the anti-falling rope, the anti-falling rope is wound in each spiral tube from the gap between each two adjacent rings of the spiral tube, the lower end of the anti-falling rope is fixed to the lower end of the tower, and the upper end of the anti-falling rope is fixed to the upper end of the tower. The hanger and the tower have the advantages that an operator can hold the anti-falling rope by one hand and wind the anti-falling rope into each spiral tube from the gap between each two adjacent rings of the spiral tube, so that a ropeway can be formed by the hangers and the anti-falling rope; the operator can firmly hold a stud on the tower by the other hand and can be prevented from accidentally falling, and accordingly the personal safety of the operator can be guaranteed.

The invention relates to a hanging buckle structure for carrying articles, which comprises a belt clip base and a belt clip. The belt clip base comprises a belt clip base main body and a hanging buckle; the hanging buckle comprises a connecting part, a neck part and a limitation part; a front panel of the belt clip is provided with a notch and a spacing notch; the notch is communicated with the spacing notch; and after the belt clip is arranged on a belt on the waist of a user, a limit part of the hanging buckle on the belt clip base is embedded into the spacing notch of the front panel of the belt clip from the notch of the front panel of the belt clip, so that the neck part of the hanging buckle is clamped at the spacing notch. The hanging buckle structure has the advantages of long service life, simple structure, attractiveness, elegance, firmness and convenient loading and unloading. The invention also relates to an interphone provided with the hanging buckle structure, which can be conveniently taken out from the belt on the waist of the user at any time, while the belt still can stay on the belt so as to be separated from the interphone, so the problem that the handfeel is influenced due to the belt clip when the interphone is used is solved; and meanwhile, the buckle structure also ensures the safety of the interphone.

The invention belongs to the field of motor processing equipment, and particularly relates to novel stamping equipment used for motor processing. The novel stamping equipment is characterized in that a rotating rod is mounted on a rack; a rotating shaft of an eccentric wheel is mounted on the rotating rod; a driven wheel is mounted on the rotating rod; a frame body is arranged outside the eccentric wheel; an upper upright rod is arranged at the upper end of the frame body; a lower upright rod is arranged at the lower end of the frame body; an upper fixed sleeve is mounted on the rack, and sleeves the outside of the upper upright rod; a lower fixed sleeve is mounted on the rack, and sleeves the outside of the lower upright rod; a limiting plate is positioned above the upper fixed sleeve, and is connected with the tail end of the upper upright rod; an upper mold is arranged between the lower fixed sleeve and a lower mold, and is connected with the tail end of the lower upright rod; the output shaft of a motor is connected with a driving wheel; the driving wheel and the driven wheel are driven through a belt; and an upper tensioning wheel and a lower tensioning wheel adhere to the belt.

The invention discloses a children dining chair convenient to adjust. The dining chair comprises a bracket, a seat, a pedal and a dining plate, wherein the bracket is provided with first supporting legs and second supporting legs which stand on the ground simultaneously; the middles of the first supporting legs can be clamped and fixed with the ends of the second supporting legs; a plurality of clamping grooves are formed in the first supporting legs; the seat is fixedly arranged at the tops of the first supporting legs by virtue of lifting adjusting mechanisms; the lifting adjusting mechanisms comprise hooks with the middles rotatably connected to the side faces of the seat, elastic pieces and lifting pressing rods; a clamping part, which extends into the corresponding clamping groove so as to support the seat, is arranged at one end of each of the hooks; the elastic pieces are used for driving the clamping parts to move into the corresponding clamping grooves; and the lifting pressing rods are used for pressing the other ends of the hooks, so that the clamping parts move out of the clamping grooves. The children dining chair disclosed by the invention is simple in structure and convenient to use; the bracket of the dining chair is foldable and is capable of self-standing; a seat height and a backrest angle are adjustable; the pedal is capable of lifting as required; and the dining plate, when adjusted back and forth, is prevented from escaping, so that the dining chair is safer.

The invention provides an adjustable automobile pedal. The adjustable automobile pedal comprises a pedal arm, a pedal face, a rotating shaft, a return spring, an adjusting plate, a spiral spring, an adjusting screw rod and a motor. The pedal face is connected to the pedal arm through the rotating shaft in a pivoting mode. The return spring provides restoring force for rotation of the pedal face. The adjusting plate is fixed to the pedal arm. The adjusting screw rod is provided with a threaded rod part and a belt wheel. The threaded rod part penetrates the spiral spring and then is matched with a threaded hole in the adjusting plate. The threaded rod part abuts against the pedal face. The motor and the belt wheel are in transmission through a belt. A switch of the motor controls the motor to drive the adjusting screw rod to rotate forwards or rotate reversely. The invention further provides an automobile. Driving comfort can be improved in a convenient adjusting mode.

The invention discloses a construction aluminum alloy curtain wall, and particularly relates to a plug-in type combined curtain wall. The structure of the curtain wall is as follows: aluminum alloy transverse beams and vertical columns of the curtain wall are connected with classification connection elements in a matching manner, and the aluminum alloy transverse beams, the vertical columns and the classification connection elements are combined, so that curtain wall main frames with specific forms are formed; transverse beams, vertical columns and exposed frame curtain wall type connection elements are combined, so that a main frame of an exposed frame curtain wall is formed; the transverse beams, the vertical columns and hidden frame type connection columns are combined, so that a main frame of a hidden frame curtain wall is formed; the transverse beams, the vertical columns and the classification connection elements are locked by using screws, so that relative sliding is prevented; afterwards, the transverse beams, the vertical columns and the classification connection elements are combined with wall surface systems (wall surface materials and supporting frames thereof) of the transverse beams, the vertical columns and the classification connection elements, so that curtain walls with corresponding forms are formed; the combination manner is a tenon and groove matching connection manner; standardized grooves are formed in the aluminum transverse beams and the vertical columns, standardized tenons are arranged on the classification connection elements, and the grooves and the tenons are connected mutually in a matching manner; the wall surface systems and the main frames also adopt the tenon and groove matching connection manner, namely, hook tenon insertion hanging connection; and a positioning manner is an 'occupancy lokcing' method, that is, a bolt or a limiting block occupies a necessary movement vacancy for the hook tenon insertion hanging connection, so that the bolt or the limiting block cannot get out of the vacancy.

The invention provides drying equipment which comprises a shell and a sliding plate rack. An opening is formed in one face of the shell. The sliding plate rack comprises a movable plate capable of being matched with the opening in a sealed mode. A clothes hanging rod and a supporting rod are arranged on one side, facing the opening, of the movable plate. A hollow layer is arranged in the shell. A fan is arranged in the hollow layer. The hollow layer and an inner cavity of the shell are communicated through an air inlet and an air outlet. A drying agent box used for containing drying agents and an adsorbing agent box used for containing absorbing agents are arranged in the hollow layer. An electric heating device and a closing mechanism are arranged in the hollow layer. The closing mechanism seals the drying agent box and the adsorbing box after being closed. The closing mechanism keeps an opening state when the sliding plate rack and the shell are sealed, enables a circuit of the fan and a circuit of the electric heating device to be connected, keeps the closing state when the sliding plate rack and the shell are separated, and enables the circuit of the fan and the circuit of the electric heating device to be disconnected. The drying equipment prevents clothes from winkling in the drying process, prevents smells on the clothes from being dispersed, and saves energy sources.

The invention discloses a material loading trolley for a sterilizing cabinet, which is convenient to transport and use. The material loading trolley comprises a trolley body and two rows of castors arranged on the lower part of the trolley body, wherein the trolley body comprises a rectangular pipe framework and receiving trays arranged in the framework; one end of the bottom of the framework is provided with a trolley hooking device for hooking an adjacent loading trolley; the trolley hooking device comprises a pair of support plates arranged in parallel at the bottom of the framework; a revolving shaft is hinged between the two support plates; the revolving shaft is provided with at least one hooking plate for hooking the adjacent loading trolley; a connecting plate is fixedly arranged at the bottom of the hooking plate; an unlocking plate which is stepped by a user to press the connecting plate down is fixedly arranged on the connecting plate; a torsional spring is arranged on the revolving shaft in a sleeving manner; the two ends of the torsional spring are arranged between the bottom surface of the framework and the connecting plate in a clamped manner.

The invention provides a transversely-placed manual transmission backing security device, belonging to the field of automobile transmission technique. The backing security device comprises a selecting and shifting shaft, a security base, a retainer, a pulling block shaft, a torsion spring, a pulling block and an elastic pin; wherein, the security base is sheathed right at the center of the selecting and shifting shaft; the retainer is fixedly arranged on the security base and vertical to the selecting and shifting shaft; the pulling block shaft passes through the elastic pin and is vertically fixed on the security base; the torsion spring enwinds the pulling block shaft; two ends of the torsion spring are respectively fixed on the pulling block. The transversely-placed manual transmission backing security device avoids the backing security pulling block shaft of transmission in the prior art from slipping out when in use, ensures the backing security pulling block to smartly rotate, locks and recovers the gear-backing, simplifies the assembly, eliminates the assembly risks and has easy assembly process.

The invention discloses an insulating sealing edge strip which comprises an edge clamping strip, plugs and pins. An arc-shaped groove is formed in one side of the edge clamping strip. A tensioning rod is arranged inside the arc-shaped groove. A U-shaped groove is formed in the other side of the edge clamping strip. A layer of soft materials used for sealing is arranged inside the U-shaped groove. The plugs are installed at the two ends of the U-shaped groove. Pin holes used for fixing the plugs are formed in the edge clamping strip. The insulating sealing edge strip is convenient to use, good in insulating property, high in sealing performance, resistant to creep and impact and capable of being clamped on a cathode edge firmly.

Inner claws for an engaging section (210) for a dial (105) are engaged with engaging grooves in a rotary encoder (320). The dial (105) has formed thereon retaining projections projecting outward radially from the engaging section (210) at intervals in the circumferential direction. A through-hole (500) through which the engaging section (210) can pass and recesses through which the retaining projection can pass are formed in a door frame (120). The retaining projections are adapted so that the projections can pass through the recesses only when the phase in the circumferential direction of the projections coincides with that of the recesses. The retaining projections are positioned on the opposite side of an operation section (200) in the recesses to enable the retaining projections to freely rotate in synchronism with the rotation of the operation section (200).