57results about How to "Reduce the cross-sectional area" patented technology

The utility model relates to a kind of spray panels for liquid-cooled energy storage integrated cabinet, it includes plate body, the continuous fluid passage is set up on the plate body upper surface, the fluid passage is equipped with liquid inlet;Multiple spray holes are set up on the plate body, each The spray hole is all through the plate body and is communicated with the inside of the fluid passage;Along the flow direction of fluid in each branch of the fluid passage, the spray hole aperture that is away from the branch entrance is greater than the spray hole aperture close to the branch entrance;And the cross-sectional area of the fluid passage corresponding to the spray hole that is away from the branch entrance and is communicated is less than the cross-sectional area of the fluid passage corresponding to the spray hole close to the branch entrance and is communicated.The utility model realizes the effect that each hole liquid is consistent, improves energy storage cabinet battery heat dissipation uniformity.

The utility model belongs to the technical field of cleaning electric appliances, disclose a kind of air duct pipe and dust collector, air duct pipe includes tube body, rubber sleeve and push mechanism, tube body is provided with opening, opening communicates the inner chamber of tube body, rubber sleeve is sleeved in the outer periphery of tube body, and covers opening, push mechanism is installed on tube body, and it is configured as the part of rubber sleeve that is overlapped with opening towards the inside of tube body is pushed.In the effect of push mechanism, the part of rubber sleeve that is overlapped with opening will be deformed, and it is extended into tube body interior by opening, whereby, at opening, the cross-sectional area of air duct reduces, to be able to increase the airflow velocity in air duct pipe, to be able to increase suction force further.The air duct pipe in the utility model can adjust the flow rate of its internal airflow, to be able to adjust suction force size under the premise of not changing motor power, to be able to avoid causing dust collector energy consumption increase.

This invention provides a molding die for a composite satellite fairing, comprising: a main female mold (1), a front support base (2), and a rear support base (3); the main female mold (1) includes a molding curved template (4), a porous reinforcing rib plate (5), base mounting feet (6), and a back venting structure (7). This invention enables uniform heating of the double-curvature structure, thereby reducing curing deformation and improving the appearance molding quality. This invention designs the size of the vent holes in the back reinforcing ribs of the large-size fairing mold through iterative analysis of the thermal flow field. As the distance in the heat flow direction increases, the cross-sectional area of ​​the vent holes gradually decreases, allowing more heat flow to accumulate in the mold's location away from the heat source, reducing the temperature gradient on the back of the mold in the heat flow direction, resulting in a uniform mold surface temperature and reduced curing deformation.

The application discloses a kind of nanometer pool stirring device, belong to stirring device technical field, to solve the existing adoption high-power mixer is stirred, there can be more security risks and power output energy waste, and aeration balance is not utilized, easy to cause energy waste, while the range of stirring is limited, often easy to appear the problem of stirring dead zone, invention includes nanometer pool main body and the liquid guide pipe connected in nanometer pool main body side, the inside of nanometer pool main body is fixed with support frame, the application can utilize the aeration of external surplus, can be simultaneously aerated from the aeration device and flow guide cylinder of multiple groups and lead out, form spiral rising water flow, further utilize the spiral rising water flow generated, can realize the effect of stirring, while spiral rising flow field, can reduce the dead zone of stirring, so that stirring is more uniform, to replace original power stirring equipment, to reduce the energy consumption and unsafe problem generated by power equipment stirring.

The invention provides a multi-dimensional vibration platform with oppositely-arranged double-sandwich piezoelectric actuators and an excitation method of the multi-dimensional vibration platform, and belongs to the technical field of high-frequency vibration engineering and micro-nano machining.The vibration platform comprises a center platform, the two oppositely-arranged piezoelectric actuators, two end covers and two bolts, wherein the center platform is integrated with the tail end platform, the two flexible hinges and the two amplitude-change poles, and the center platform is slender and is in mirror symmetry about the longitudinal symmetry plane of the tail end platform. The piezoelectric actuator comprises a longitudinal vibration ceramic group, a bending vibration ceramic group around the Y axis and a bending vibration ceramic group around the Z axis, translation along the X / Y / Z axis and rotation around the Y / Z axis can be realized through in-phase or anti-phase excitation different combinations under the condition of not increasing extra driving channels, and five-degree-of-freedom high-frequency micro-vibration output can be achieved at most. The structure has high symmetry, low parasitic vibration, compact size and high integration, and is suitable for precise engineering scenes such as micro-nano processing, laser-assisted manufacturing, cell manipulation and active vibration suppression.

The application relates to the technical field of cleaning, and discloses a liquid storage box, a cleaning device and a cleaning system. The liquid storage box comprises a box body and a noise reduction piece. The box body is provided with a liquid suction cavity and a liquid suction opening. The liquid suction cavity extends along a first direction. The noise reduction piece is arranged in the liquid suction cavity. The noise reduction piece and the cavity wall of the liquid suction cavity enclose a liquid suction channel. The liquid suction channel is in communication with the liquid suction opening. The liquid storage box is provided with the noise reduction piece in the liquid suction cavity. The noise reduction piece occupies part of the space in the liquid suction cavity. The size of the liquid suction channel enclosed by the noise reduction piece and the cavity wall of the liquid suction cavity is smaller than the size of the liquid suction cavity without the noise reduction piece. Therefore, the suction force in the liquid suction channel is relatively large. The liquid suction cavity is beneficial to the suction of a small amount of water at the bottom of the liquid suction cavity. Therefore, the noise is reduced, and the user experience is improved.

The invention discloses a systematized bundling method for high-voltage waste cables, and belongs to the field of warehouse logistics automation. A working platform capable of fixing and compressing cable bundles is arranged, and a plurality of cable seats are arranged on the working platform; carrying out transverse and vertical extrusion treatment on the placed cable bundle; binding operation is completed through an arrow penetrating type binding machine; measuring the weight of the cable bundle by using a weight sensor arranged at the bottom of each cable seat; data support is provided for calculating the gravity center position of the bundled cable bundle; printing information labels including cable specifications, binding dates and total weight, pasting the information labels on any binding tape, and meanwhile, archiving data to a warehouse database; the horizontal gravity center position of the cable bundle is calculated according to data of all the weight sensors, indicator lamps of cable bases located on the two sides of the gravity center position are lightened, a forklift operator is guided to hoist the cable bundle at the cable base position between the two lamps, and it is ensured that the cable bundle is safely transferred to a storage area. And the method is especially suitable for classified management of cables with different lengths and bending after construction.

This utility model relates to the field of circuit on / off switching technology, and provides a flat push-plate press-type limit switch, comprising: a housing with a mounting cavity; a base disposed at one end of the mounting cavity, having a through hole in its center; a combination button disposed in the mounting cavity, one end of which extends out of the housing through the through hole and is slidably sealed to the inner wall of the through hole; conductors are arranged alternately and at intervals on the outer wall of the other end of the combination button in the mounting cavity; a contact spring structure disposed in the mounting cavity, having springs respectively connected to each conductor; when the combination button is pressed, the combination button drives the conductors to move axially, and each conductor is connected to each spring; when the force of pressing the combination button is released, the combination button is reset by the spring, and each conductor is disconnected from each spring. This utility model achieves a double-set contact redundancy design in a confined space, ensuring both simultaneous on / off of two circuits and reliable circuit switching.

This invention provides a beam structure with UHPC filling in the shear bending section and its prefabrication method, solving the problems of current beam construction methods that use only UHPC, which not only result in a large structural self-weight and high cost, but also increase the overall construction cost and extend the construction period. This invention includes ordinary concrete beam sections and UHPC beam sections, which are spaced apart along the length of the beam. Taking into account the stress characteristics of the shear bending section of reinforced concrete beams, this invention fills a certain length of UHPC material only in key areas of the reinforced concrete shear bending section to improve the mechanical properties of the main beam's shear bending section, significantly increasing the shear bearing capacity of the main beam. Simultaneously, filling a portion of the main beam's shear bending section with UHPC effectively reduces the cross-sectional area of ​​the beam near the supports, reducing the structure's self-weight and lowering the construction cost of the UHPC, thus exhibiting good economic efficiency and practicality.

A coil spring (1B) includes a wire (2) including a circular cross-section portion (30) and a flat cross-section portion (100). The circular cross-section portion (30) includes a first cross-section (S1) having a circular cross-section. The flat cross-section portion (100) includes a flat second cross-section (S2). The width of the second cross-section (S2) is greater than or equal to the diameter of the first cross-section (S1) and the thickness is less than the width. The polar cross-section coefficient of the second cross-section (S2) is smaller than the polar cross-section coefficient of the first cross-section (S1). And a variable cross-section part (32) formed between the circular cross-section part (30) and the flat cross-section part (100). The variable cross-section part (32) changes the cross-section thereof from a circular shape to a flat shape from the circular cross-section part (30) toward the flat cross-section part (100).

The utility model relates to electronic product assembly technical field discloses a kind of electrically-conductive parts mounting equipment, comprising: bearing, including insertion section and exposed section, insertion section is connected with exposed section and is equipped with via, bearing is equipped with cavity and bearing surface, bearing surface is at least partially located insertion section, for bearing electrically-conductive parts, via is through bearing surface, cavity is communicated with via and is through the surface of exposed section;Limit protrusion, be located at the outer circumferential surface of exposed section;Jacking part, insert in cavity, and from exposed section, jacking part has jacking protrusion, jacking protrusion is movably inserted in via.The electrically-conductive parts mounting equipment of the utility model has the advantages of simple operation, electrically-conductive parts is not easy to deviate, yield and production efficiency is high.

The utility model provides a variable cross-section prestressed concrete beam and a beam-column connection joint structure, and relates to the technical field of fabricated frame structures. The prestressed concrete beam comprises a precast beam body, beam end connecting pieces are embedded in the two beam ends in the extending direction of the precast beam body respectively and used for being fixedly connected with column side connecting pieces in a node area of a precast column body in a screwed mode. The lower part of the precast beam body is provided with prestress applying areas which are symmetrically arranged relative to the midpoint of the precast beam body in the first direction, and a plurality of prestressed tendons which are distributed at intervals in the second direction are arranged in the prestress applying areas; the arrangement range of the prestress applying area in the first direction is located between two inflection points of the precast beam body; wherein the first direction is the extension direction of the precast beam body, and the second direction is the width direction of the precast beam body.

The utility model relates to hydraulic breaking hammer technical field especially hydraulic breaking hammer power assembly, include: drill rod seat for installing cylinder and drill rod, this drill rod seat is used for sliding installation drill rod, the piston is slidably installed in this cylinder, reversing valve, this reversing valve is installed on the cylinder and is equipped with the hydraulic oil circuit for the hydraulic oil flow circulation between it and the piston cavity in the cylinder, this reversing valve passes through reversing control hydraulic oil and enters the different cavity of piston for realizing piston reciprocating motion along the cylinder, energy accumulator, its installation is on reversing valve and is connected with the hydraulic oil circuit of reversing valve, is used for the hydraulic energy storage when piston is going up and the release hydraulic energy when piston is going down to increase the impact force when piston is going down, is used for solving the technical problem that the piston buffer of the breaking hammer in the prior art exists in the general existence of internal leakage and is hurt and the slow and long stroke of the frequency of attack.

The invention relates to a calculus removal basket mechanism with a transparent film, and solves the technical problems of frequent instrument blockage and low calculus removal efficiency in a flexible ureteroscope and negative pressure sheath lithotripsy. The mechanism comprises a framework composed of a plurality of metal wires, a high-transparency film wrapping the periphery of the framework, an outer sleeve, a central guide pipe and a push-pull control device. The framework is automatically opened to form an umbrella-shaped or cup-shaped structure when being pushed out of the outer sleeve, and can be contained in a gap between the outer sleeve and the central guide pipe when being folded. In an operation, small stones are sucked out through the meshes under negative pressure, and large stones are taken out along with a lens after being intercepted by the film, so that synchronous operation of stone crushing and stone removing is realized. The high transparency of the film ensures that the surgical field is clear, the intrarenal pressure is stabilized in a safe range, and the risk of postoperative complications is remarkably reduced. The calculus removing device is simple in structure, convenient to operate, suitable for calculus of different parts such as renal pelvis and renal calyx, and high in efficiency and safety.

The application discloses a dense structure unconventional welding manufacturing method, which is used for realizing welding of full penetration t-shaped butt welds of dense plates and metal parent plates, the thickness of the dense plate is not less than 26 mm, one side of the dense plate is provided with an obstacle plate, the ratio of the height of the obstacle plate to the distance from any point on the obstacle plate to the dense plate is not less than tan52°, the distance from any point on the obstacle plate to the dense plate is not greater than the distance for welding equipment or people to pass, the method comprises the following steps: setting the cutting angle and depth of the inner and outer side grooves, and adopting the method of welding first on the inner side shallow groove and welding later on the outer side deep groove after side cleaning.

The bipolar plate comprises a conductive substrate, a first conductive layer and a second conductive layer are respectively arranged on the front surface and the back surface of the conductive substrate, and the first conductive layer is formed by welding a conductive network on the front surface of the conductive substrate and / or spraying or plating conductive particles on the front surface of the conductive substrate; the second conductive layer is formed by welding a conductive network on the reverse side of the conductive substrate and / or spraying or plating conductive particles on the reverse side of the conductive substrate; a positive active material layer is loaded on the surface of the first conductive layer, a negative active material layer is loaded on the surface of the second conductive layer, and the first conductive layer and the second conductive layer are rolled to form a whole. The arrangement of the first conductive layer and the second conductive layer provides a good adhesion basis for the positive active material layer and the negative active material layer, the roughness and the specific surface area of the surface of the bipolar plate are increased by the conductive network and the conductive particles, so that the active material can be better adhered to the bipolar plate, and the active material can be better adhered to the bipolar plate through rolling treatment. The active material can be more tightly combined with the conductive layer to form a whole, so that the binding force between the bipolar plate and the electrode material is enhanced, the high-power charge-discharge performance of the battery is improved, the stability of the battery structure is ensured, and the performance and the cycle life of the battery are further improved.

The application discloses an aluminum non-stick pot and a production equipment, and belongs to the technical field of aluminum non-stick pot production equipment. The aluminum non-stick pot comprises a pot body, and a coating is uniformly sprayed on the circumference of the pot body; the production equipment comprises a flow line, an extension device and a spraying device. The aluminum non-stick pot and the production equipment thereof can automatically identify pot bodies with different diameters, and match the speeds of the pot bodies with different diameters, so that the linear speeds at the maximum diameters of the pot bodies with the same size are basically consistent during spraying, thereby improving the uniformity of the spraying on the surface of the pot body, the coating thickness on the surface of the pot body with different sizes is basically consistent, the flow of each position nozzle is automatically adjusted according to the arc on the pot body, the coating on the side surface of the pot body with different diameters is basically consistent at the same rotating speed, and the uniformity of the spraying on the surface of the pot body is further improved.

The present application relates to the technical field of vehicle passenger room air channel, in particular to a special air duct for vehicle air conditioner and a vehicle, the special air duct for vehicle air conditioner is a flexible body, used for being arranged in the air conditioner air supply duct, the special air duct has a special air inlet and a special air outlet, the special air inlet is connected with the air conditioner air outlet on the inner wall of the air conditioner air supply duct, and the special air outlet is connected with the air supply duct air outlet on the inner wall of the air conditioner air supply duct, so that the air treated by the air conditioner is conveyed into the vehicle compartment through the special air duct, air supply is carried out by using the flexible special air duct, the space in the air conditioner air supply duct can be adapted, the cross section area mutation is reduced, the influence of the existing parts in the air conditioner air supply duct on the airflow can be avoided, the airflow kinetic energy can be effectively reduced due to the contact between the airflow and the parts, and the uniformity of the air outlet of each air supply duct can be ensured.

The utility model provides a premix mixing machine feeding device which comprises a feeding machine box, the feeding machine box is fixedly connected with a premix through installation stand columns fixedly installed at the four corners of the lower portion of the feeding machine box, and a discharging pipe opening formed in the lower portion of the feeding machine box and a feeding pipe opening of the premix are installed together through flange connection. A driving motor is mounted on a grinding type feeding mechanism mounted in the feeding machine box, and a material storage cavity, a transition cavity and a grinding cavity which are communicated with one another are formed in the feeding machine box; according to the utility model, the integration of material grinding and conveying is realized through the grinding type feeding mechanism, the vertical series cavities enhance grinding by virtue of gravity and a conical structure, the material pushing blocking plate is matched with the feeding hole group to accurately control materials, the feeding efficiency is improved by virtue of cooperation of the spiral blades and the lines, the process is simplified, and the cost is reduced.

This invention relates to the field of testing equipment technology and provides an airtightness testing device, including an airtightness detector, an air intake assembly, and an elastic sealing plug. The air intake assembly includes a hollow air intake pipe and a support base. One end of the air intake pipe is fixedly connected to the support base, and the other end is provided with an external interface for connecting an external airtightness detector. The support base has a through-hole for connecting the air intake pipe and a cavity. The sealing plug includes an arcuate portion adapted to a narrow throat, a first limiting portion, and a second limiting portion. The sealing plug has a through-hole for the air intake pipe to pass through. The through-hole is located on the inner wall of the first limiting portion, which is recessed inward to form an abutment groove for restricting the movement of the support base. In this invention, the airtightness testing device has a simple structure, is quick to install and disassemble, ensures the reliability of liquid-fueled rocket engine quality, effectively improves the efficiency of liquid-fueled rocket assembly and testing, and shortens the preparation time before rocket launch.

The invention relates to the technical field of unmanned aerial vehicles, and provides a mooring unmanned aerial vehicle system which comprises a mooring unmanned aerial vehicle, a pipe cable, a storage basket, a winding disc, a guide part, a driving assembly and an unmanned aerial vehicle positioning device. The storage basket comprises a vertical winding support, the unmanned aerial vehicle positioning device comprises a coarse positioning assembly and a fine positioning assembly, the coarse positioning assembly comprises a first guide support and two second guide supports, and the fine positioning assembly comprises a guide supporting seat; the output end of the driving assembly is in transmission connection with the winding disc. A guide groove is formed in the first guide bracket, a first inclined guide part is formed on the second guide bracket, and a second inclined guide part is formed on the guide supporting seat; an unmanned aerial vehicle undercarriage is arranged at the bottom of the mooring unmanned aerial vehicle and provided with a guide rod. The precision and stability of the mooring unmanned aerial vehicle during flight task execution are improved, the landing precision of the mooring unmanned aerial vehicle is improved, and the defects that when the non-shape-preserving pipe cable is wound, the pipe cable is wound too tightly, and the sectional area of the pipe cable is compressed are overcome.

The application relates to the technical field of medical devices, in particular to a heart atrial shunt device which comprises a lead-through part and first and second positioning bodies arranged on the two sides of the lead-through part respectively, and the lead-through part, the first positioning body and the second positioning body are integrally woven by a single braided wire. In the embodiment of the application, the heart atrial shunt device is integrally woven by the single braided wire without needing to process bulk wire heads, after installation, no redundant structure protrudes into the left and right atria, blood clots are not easy to form, the structure is simple, the size is smaller during contraction, and the damage to the access blood vessels during implantation is smaller.

The utility model relates to a photovoltaic module for reducing current loss based on cell subdivision and a circuit thereof, and the photovoltaic module comprises a cell string which is formed by connecting a plurality of cell slices in series through a solder strip; the battery piece fragments are formed by slitting battery pieces; the battery piece is cut into 4a (a is a natural number greater than 0) battery piece fragments; electrodes in the battery piece fragments are printed into independent areas; and the cell slices are connected in series through welding strips. The current of the battery piece is set as I, the current of the divided battery piece is I1, and I1 = I / 4a; the sectional area of the welding strip is in direct proportion to the current of the battery string, so that the current in the single battery string is reduced by dividing the battery piece into multiple parts, the current loss can be reduced, the heating risk of the assembly is greatly reduced, and the power generation output is higher; the battery piece is divided into multiple parts, the current in the single battery string is reduced, and the sectional area of the welding strip is reduced, so that the sectional area of the interconnection strip of the series battery string is reduced, and the material cost of the assembly can be reduced.

The invention relates to the technical field of brushless direct current motors, in particular to a heat dissipation and weight reduction collaborative optimization method for a rotor shell of a brushless direct current motor. The method comprises the following steps: determining the minimum allowable value of the thickness of the radiating rib according to the mechanical strength requirement and the processing technology feasibility of a rotor shell material; according to the total axial length of the rotor shell and the minimum allowable value of the thickness of the radiating ribs, the maximum number of the radiating ribs which can be arranged on the outer surface of the rotor shell is calculated; a plurality of radiating ribs are uniformly arranged on the outer surface of the rotor shell according to the maximum number and the minimum allowable thickness of the radiating ribs, so that the plane where the radiating ribs are located is perpendicular to the axis of the rotor shell; and the sharp edges of the heat dissipation ribs are blunted to obtain the rotor shell with the heat dissipation performance and the weight reduction performance cooperatively optimized. Through the characteristic that the sectional area of the rectangular-section radiating ribs is smaller under the same radiating area, the weight of the rotor shell is reduced on the premise that the radiating performance is not reduced, and meanwhile, the structural strength is ensured.

The utility model relates to a positioning guider for acromioclavicular dislocation implantation surgery, which comprises a connecting part, positioning parts respectively arranged at two ends of the connecting part and a drill bit guide cylinder, a rotary sleeve in threaded fit is arranged on the outer surface, close to the bottom, of the drill bit guide cylinder, and a fixed shaft axially parallel to the rotary sleeve is arranged outside the rotary sleeve. An arc-shaped sleeve is rotationally arranged on the fixing shaft, a clamping part is arranged at the non-hinged end of the arc-shaped sleeve, and a limiting protrusion used for limiting the rotating stroke of the arc-shaped sleeve is arranged at the position, matched with the fixing shaft, of the arc-shaped sleeve. The clamping part is arranged outside the drill bit guide cylinder in a folded mode through the arc-shaped sleeve, when the drill bit is used, the unfolded clamping part can clamp an upper skeleton through relative rotation between the fixing shaft and the arc-shaped sleeve, the overall sectional area is small after the drill bit is folded, and the drill bit is convenient to use. And a wound caused in the process of placing the drill bit guide cylinder is smaller.

The utility model relates to the technical field of automobile exhaust, especially relates to a car exhaust pipe structure, including the front section, the middle section and the rear section that connect gradually, the front section is connected with catalytic converter and is provided with the variable cross section mechanism that can change its inside radial flow area, the rear section's tail end is equipped with the variable tail throat structure that can change the exhaust emission space, can optimize the engine performance.

The utility model provides an energy -conserving structure section steel claw belongs to aluminium smelting technical field. Energy -consaving structure section steel claw includes guide rod, crossbeam and branch leg. The material of guide rod is configured as aluminium. Crossbeam includes first combination layer and second combination layer, the material of first combination layer is configured as aluminium, the material of second combination layer is configured as steel, first combination layer and second combination layer mutually close surface explosive welding, guide rod is welded with first combination layer, and the both ends of crossbeam along the length direction of itself have the groove, and the groove is set to one side of crossbeam close to guide rod. The one end of branch leg along the length direction of itself is welded with second combination layer, and the number of branch leg is multiple, and multiple branch legs are arranged along the length direction of crossbeam, and the one end of branch leg away from crossbeam is inserted in anode carbon block, and the material of branch leg is configured as steel. The energy -conserving structure section steel claw of the utility model can reduce the resistivity of steel claw, improve the even degree of current distribution in steel claw and improve the structural stability of steel claw.

The utility model discloses a multi-layer spring low-frequency tuned mass damper, which comprises a structural frame, and a mass block guide component and a spring guide component are arranged on the structural frame; the stiffness system comprises at least one group of multi-layer springs, each group of multi-layer springs comprises at least two layers of springs which are connected in series up and down, and a spring limiting part is arranged between every two adjacent layers of springs; the mass block is mounted on the mounting plate; wherein the multiple layers of springs are supported below the mounting plate, the spring limiting component is in up-and-down sliding fit along the spring guide component, and the mounting plate is in up-and-down sliding fit along the mass block guide component. The damping effect is good and the overall size is small.

The application provides a charging socket, and relates to the technical field of charging accessories. The charging socket comprises at least two power terminals, the power terminals are provided with connecting end faces, at least two connecting assemblies, the two connecting assemblies are connected with the connecting end faces of the two power terminals in one-to-one correspondence, and at least four conductive pieces, at least one power terminal is connected with at least two conductive pieces through the connecting assembly. The application connects a single power terminal with multiple conductive pieces (such as at least two conductive pieces) through the connecting assembly, so that the charging power is increased. Compared with the method of increasing the charging power by using a single large-section wire, since the increased power and total current-carrying capacity remain unchanged, the single large-section wire is replaced by multiple conductive pieces, so that the cross-sectional area of each conductive piece is smaller than that of the single wire, the conductive piece with a small cross section is easier to prepare, and the cross section is smaller, so the conductive piece is easier to bend and wire, and assembly is facilitated.