13529 results about "Bevel gear" patented technology

A surgical instrument particularly suited to endoscopic articulates an end effector by including an end effector having a geared articulation mechanism that converts rotational motion from a handle portion. A hollow articulation drive tube transfers the rotation motion in some versions to a spear gear, bevel gear or snaggle tooth gear articulation mechanism. Alternatively, one or more threaded drive rod offset from a longitudinal axis engages a worm gear or flex-neck articulation mechanism.

An aircraft including an airframe having a fuselage which extends longitudinally, and having fixed wings including a main wing, a horizontal tail wing and a vertical tail wing. A propeller-rotor torque transmission has a bevel gear which transmits the rotation of an input shaft simultaneously to a propeller shaft and to a rotor shaft. An engine gearbox supplies the above-mentioned input shaft with rotationalal motive power. The aircraft further includes a propeller collective pitch controller, a rotor collective pitch controller, an engine power controller which controls the output of the above-mentioned engine gearbox for the purpose of changing the rotational speed of the input shaft, and a flight control system having a directional (yaw) control system which controls the flight direction of the aircraft by controlling the positions of the above-mentioned control surfaces.

An orientation preserving angular swivel joint suitable for mechanical robotic arms and in particular snake robots, the joint comprising two members and an angular bevel gear train that connects the two members of the joint. The gear train allows an actuator to be positioned along the axis of the joint while transferring forces to the periphery of the mechanism, thus creating a high mechanical advantage proportional to the radius of the robot. The gear train is capable of transferring rotational motion between the two members with a constant ratio. Relative rotation between two bays of the joint does not take place, thereby preventing electrical wires running through the body of the snake from being twisted, and thus avoiding failure.

The invention provides a power supply equipment interface device using bevel gear transmission. The power supply equipment interface device comprises a jack base device (9) and a plug device (8). The plug device (8) is used for being plugged in the cavity of the jack base device (9) and the tail end of the plug device (8) is provided with a connecting notch (82) used for being connected with a connecting protrusion (92) in the cavity so that electrical connection is realized. The jack base device (9) comprises an end part wall (91), a transverse side wall (99) and a base body (98) opposite to the end part wall (91) so that the cavity is formed through enclosing. The right end of the connecting protrusion (92) is provided with a transmission block (99) which is connected with the base body (98) via elastic electric connectors (981, 982). The plug device (8) is provided with a positioning protrusion (81) used for being connected with the external side of the end part wall (91). The cavity is internally provided with a guiding sleeve (7) which is fixedly connected with the internal side of the end part wall (91) and the base body (98). The guiding sleeve (7) is provided with two opposite guiding slots which transversely extend in a diameter direction.

A PTO apparatus for a gas turbine engine having first and second drive shafts includes a first ring gear for being coupled to the first drive shaft and a first bevel gear engaged with the first drive gear and coupled to a PTO shaft. A second ring gear is provided for being coupled to the second drive shaft. A second bevel gear is engaged with the second drive gear and coupled to the PTO shaft through a one-way clutch. A method of operating a gas turbine engine includes operatively coupling a PTO shaft to first and second drive shafts and providing a starting torque to the first and second drive shafts through the PTO shaft. After the engine is started, power is transferred from the first drive shaft to the PTO shaft; and the second shaft is decoupled from the PTO shaft.

The invention discloses an intelligent electronic door lock, which consists of two parts, namely an external lock and an internal lock, and is characterized in that: an electronic key/intelligent card induction zone, a light-emitting diode (LED) lamp and a key zone are sequentially arranged on the external lock from top to bottom; the electronic key/intelligent card induction zone, the LED lamp, the key zone and an emergency external power supply jack are connected with a control device of the internal lock through data lines; the internal lock comprises an internal lock shell and a transmission device, a driving device and a control system which are arranged in the internal lock shell; the transmission device comprises a sliding groove, a limiting groove, a position induction block and abolt which are integrated, and a positioning hole, a shifting rod and an umbrella-shaped tooth which are integrated; the driving device comprises a motor fixed in the internal lock shell and a bevel gear arranged on an output shaft of the motor; and the control system comprises a printed circuit board (PCB), an inductor and set keys.

The invention relates to a four-leg robot mechanism based on a bionic design. The four-leg robot mechanism consists of a body frame and four legs. The body frame consists of a front plate and a rear plate, two sides of the body frame are provided with flexible handles, and the robot mechanism is convenient to convey; each leg comprises a hip, a huckle, a knee and a crural part; the hip realizes two freedom degrees by adopting a differential bevel gear; the hip and the huckle are connected by an expansion sleeve to realize fast and convenient assembly and disassembly; the bevel gear drive motion is adopted by the knee; the crural part comprises a large cylinder, a small cylinder, a conical spring and a force sensor; and the large cylinder and the small cylinder are connected through the conical spring, so that the external impact force generated in the walking process of the robot can be buffered, the force sensor on a sole can acquire ground acting force, and the external environment can be conveniently sensed in real time and the robot can be subjected to balanced control conveniently. Through the bionic design idea, a spinal cord and a flexible foot mechanism of the robot are stimulated and designed, the flexibility of the robot movement is improved, the impact of the ground to the robot is reduced, and the robot mechanism has a compact structure and is convenient to install.

Motion-converter apparatus for converting bidirectional rotary movements to unidirectional rotary movements includes: an input shaft for inputting the bidirectional rotary movements; an output shaft for outputting the unidirectional rotary movements, the output shaft having a longitudinal axis perpendicular to the longitudinal axis of the input shaft; a drive bevel gear coaxial with, and driven bidirectionally by, the input shaft; a pair of driven bevel gears coaxial with the output shaft and meshing with the drive bevel gear on opposite sides of the axis of the drive bevel gear so as to be driven bidirectionally thereby but in opposite directions with respect to the output shaft; and a pair of one-way clutches coupling the driven bevel gears to the output shaft such that both one-way clutches are effective to drive the output shaft only in one direction. Various applications of such apparatus are also described, including wave and tide motors, wind turbines and bidirectional-movement measuring devices.

The invention belongs to the technical field of robots, and relates to a crawler-type pipeline robot with active adaptation and self-adaptation functions. A series combination mechanism, which is composed of a screw mechanism, a rocker slider mechanism and a parallelogram mechanism and driven by a stepper motor, is utilized to actively adapt to different pipeline diameters and keep a certain pressure between the crawler and pipeline inner wall. A set of butterfly springs arranged between the screw nut and slider are stressed to generate deformation to automatically adapt to the working conditions of pipeline joints, uneven-surface partial obstacles and the like in the pipeline. Three servomotors drive three sets of synchronous belt wheels to rotate through the transmission of a bevel gear and a cylindrical gear, thereby driving the three bifacial synchronous notched belts used as pipeline robot crawlers to move, and implementing the running function of the pipeline robot. The crawler-type pipeline robot has the simple structure, high operation and running safety, high environmental adaptability and wide application range, is convenient to use, and can work in pipelines with different diameters.

The invention relates to an engineering oil pipe paint spraying device, in particular to an engineering oil pipe surface paint spraying device. According to the technical problem to be solved, the engineering oil pipe surface paint spraying device does not need assistance of manual labor, and is good in automatic performance, high in maneuverability, high in working efficiency, convenient to operate and capable of uniformly spraying paint to the surface of an engineering oil pipe. To solve the technical problem, the engineering oil pipe surface paint spraying device comprises a left support, a right support, a material collecting frame, a top plate, a sliding block, a sliding rail, a hollow pipe, a spraying head, an air cylinder, a hairbrush, a first motor, a first rotating shaft, a first bevel gear and the like. The left support and the right support are vertically arranged in a bilateral symmetry manner. The material collecting frame is arranged below the position between the left support and the right support. According to the engineering oil pipe surface paint spraying device, in the process of spraying the paint to the surface of the engineering oil pipe, while the engineering oil pipe rotates, the spraying head sprays the paint.

The invention discloses a square tube multiple face synchronous derusting machine. The derusting machine comprises an inverted-U-shaped rack and is characterized in that an upper motor is fixed to the middle of the upper wall of the inverted-U-shaped rack, and an upper horizontal rotating wire brush is fixed to the lower end of a shaft sleeve of a motor spindle, a fixed belt wheel at the upper end of the spindle is connected with driven shafts outside the left wall and the right wall of the inverted-U-shaped rack for transmission, and the middle of the driven shaft on the left and the middle of the driven shaft on the right are respectively meshed with a shaft end bevel gear of a transverse rotating shaft for transmission through a bevel gear; each transverse rotating shaft is provided with a transverse shaft sleeve connected with the transverse rotating shaft in a matched mode through a spline, and an upper perpendicular face rotating wire brush is fixed to the inner end of each transverse shaft sleeve; idler wheels are arranged at the bottom end of the inverted-U-shaped rack; synchronous rotation of the horizontal rotating wire brush and the perpendicular face rotating wire brushes is achieved through one motor, and thus the upper surface and the two side faces of a square tube can be polished and derusted synchronously. Thus, dust on the surface of the square tube can be cleared away fast with the derusting machine, energy is saved, labor efficiency can be improved, and the using effect of the square tube is improved.

A Pelton type turbine is mounted in a riser of a pop-up sprinkler for rotation about a horizontal axis and drives a central bevel pinion gear through a gear train reduction. Upper and lower bevel gears supported on a vertical drive shaft are simultaneously driven in opposite directions by the central bevel pinion gear. A clutch slides up and down along the drive shaft to engage radially extending teeth formed on its upper and lower sides with complementary teeth formed on the upper and lower bevel gears. One end of a yoke is coupled to the clutch and the other end is moved vertically by an over-center mechanism to shift the direction of rotation of a nozzle turret connected to the upper end of the drive shaft. The over-center mechanism is tripped back and forth by a shift disc engaged by a pair of tabs of a turret coupling assembly.

The invention discloses a five-degree-of-freedom electric manipulator, which consists of a lower base plate, a base upright post, an upper base plate, a friction wheel motor, a friction wheel motor bracket, a friction wheel, a friction disc, a coder, a coder bracket, a rotary base, a belt pulley motor, a mechanical big arm, a counterweight disc, a big arm keel, a big arm belt pulley, a small arm belt pulley, a belt, a big arm rotating motor, a mechanical small arm, a small arm keel, a paw swinging motor, a paw swinging motor bracket, a big bevel gear, a small bevel gear, a paw rotating motor bracket, a paw rotating motor, a paw opening and closing motor, a paw opening and closing motor bracket, a paw, a paw opening and closing nut, a screw, a left rotary base guard plate and a right rotary base guard plate. The electric manipulator has simple structure, is convenient to operate, and can realize multiple motion forms.

The invention discloses an all-round automatic transport vehicle, which can realize the automatic process of picking up and loading goods in a narrow space. The omnidirectional automatic transport vehicle includes an omnidirectional movement mechanism, a lifting mechanism, a telescopic mechanism and a control system; the omnidirectional movement mechanism consists of four omnidirectional mecanum wheels; the lifting mechanism consists of a bevel gear mechanism, a ball screw pair and a scissor mechanism Composition; telescopic mechanism is composed of electric push rod, roller slideway and connecting rod support structure. The control system drives the mecanum wheel to realize the forward and backward movement, left and right movement, oblique movement and zero-radius turning of the transport vehicle; the movement of the bevel gear transmission mechanism makes the scissors move to realize the lifting of the platform; the movement of the electric push rod makes the platform extend and reach retract.

The invention relates to an aileron rotary folding and unfolding type flapping wing device, which includes aileron rotary folding and unfolding type flapping wings and a related drive device, wherein the wings are divided into main wings and ailerons along the wingspan direction, exterior edges of the main wings and exterior edges of the ailerons which are connected via butt hinge can relatively rotate on the wings plane with the butt hinge as an axis, and the aileron plane can be folded under the main wings plane, the drive device comprises a main wings drive device and an aileron drive device which are driven to be connected via a main drive shaft, the main wings drive device is positioned in the head section, and composed of two symmetrical crank rocker mechanisms which respectively drive the left wing and the right wing, and the aileron drive device is positioned in the middle-rear portion of the wings chordwise direction. The aileron rotary folding and unfolding type flapping wing device employs a bevel gear pair to realize rotation shaft changes, thereby multi-degree-of-freedom motion can be driven by single power, approximately saving one main drive shaft and related motors, and greatly reducing weight.

The invention provides an underactuated lower limb assistance exoskeleton robot based on a rope-pulley mechanism, and relates to an underactuated lower limb assistance exoskeleton robot. The robot aims to solve the problems that a prior active joint-driving exoskeleton has large self-mass, large drive energy consumption, and a passive joint exoskeleton cannot provide effective assistance. The robot comprises a harness device, a drive control power system, two thigh bar devices, two leg bar devices, two ankle devices, two drive devices and two strings; wherein each drive device includes a motor shell bracket, a first motor shell, a waist frame, a planetary reducer, a second motor shell, a servo motor, a third motor shell, a hip joint spline shaft, a drive pulley, an elastic actuator, a first shaft sleeve, a small bevel gear, a large bevel gear, a second shaft sleeve, a fourth motor shell, a fifth motor shell, a sixth motor shell, a fixing plate and two first bearing end covers with bearings. The underactuated lower limb assistance exoskeleton robot based on the rope-pulley mechanism is used for the field of assistance exoskeleton robots.

The invention provides a water plant reaping and harvesting ship which comprises a hull, a water plant cutting device, a water plant conveying device, a water plant collecting device, auxiliary collecting devices and a power device. The water plant conveying device is arranged on an installing frame of the bow in an inclined mode, the lowest end of the water plant conveying device is connected with the water plant cutting device, and the water plant collecting device is arranged at one side of the highest end. The water plant cutting device comprises a bevel gear drive mechanism, a slider-crank mechanism and a cutter reciprocating mechanism. The water plant conveying device comprises a chain plate, a chain wheel, a chain, and a water plant leakage preventing mechanism arranged on the chain plate. The water plant collecting device comprises a collecting hopper, a collecting box, a guide rail, and a collecting platform arranged on the stern. The auxiliary collecting devices are profiling variable wing eccentric collecting wheels or collecting plates arranged on the bow. The water plant reaping and harvesting ship integrates water plant cutting, conveying and collecting, all the devices are convenient to combine, and easy to disassemble, replace and maintain, connection in the whole harvesting process is close, the mechanical degree is high, and the reaping efficiency is far higher than that of manual salvage.

The invention discloses a heat dissipation and drying electric cabinet which is convenient for movement and positioning, which comprises a cabinet body, a chute, a support plate, a far-infrared heating plate, and a semiconductor refrigeration sheet; A lifting mechanism fixed on the bottom of the cabinet is installed in the space of the cabinet. The lifting mechanism includes a worm wheel, a worm, a rotating shaft, a fixed rod, a driving bevel gear, a driven bevel gear, a screw, and a screw sleeve. Rollers are installed at the lower end of the screw sleeve. A connecting rod is installed between the sleeves. The invention is simple in structure, easy to use, strong in practicability, safe and reliable, reduces the influence of humidity on the high-voltage switch cabinet, and can effectively reduce the temperature inside the cabinet; by rotating the worm wheel, the contact between the roller and the bottom surface can be indirectly adjusted, so that the cabinet can be conveniently The body is moved and positioned, and the operation is fast and flexible.

Disclosed is a suspending tapered bucket type semisolid metal slurry preparation and conveying apparatus, which belongs to the technique field semisolid metal machining. The apparatus comprises an adjustable speed motor 1, an elevating mechanism 2, an air pipe 3, a connecting device 4, a press-casting machine injection chamber 5, an air port 6, a transmission bevel gear 7, a mandrel 8, a coupling 9, an air pipe 10, a pony ladle 11, an inner tapered bucket 12, an outer tapered bucket 13, a heating and cooling element 14, a flanged disc 15 and the like. When in semisolid metal slurry preparation, according to the shearing deformation principle, the purpose of forming fine and even semisolid metal slurry can be achieved through the intense shearing function when the liquid state metal passes through gaps between the rotating inner tapered bucket and the outer tapered bucket which are inscribed with specific grooves, and the prepared semisolid metal slurry is conveyed to the press-casting machine injection chamber through the connecting device to realize the rheological die-casting molding. The invention has the advantages of: simple and compact equipment structure and light weight; high temperature control precision; convenient and reliable operation, and easy realization from semisolid metal slurry preparation, conveying to die-casting molding; and convenient maintenance and repair and industrialized continuous production.

A differential mechanism includes a housing portion having a generally annular wall with a generally annular inner surface. The annular wall defines an open end of the housing portion. The lid is affixed to the open end forming an enclosure with the housing portion. The opposing side bevel gears are in driving engagement with at least one bevel pinion assembly. The bevel pinion assembly includes at least one bevel pinion shaft with opposing axial ends, each supporting a side bevel gear. The bevel pinion assembly and the side bevel gears are disposed within said enclosure. The annular inner surface defines at least two receptors having ingress's, each receptorengaging one axial end of the pinion shaft independently of the lid.

The invention discloses a two-degree-of-freedom robot wrist, which relates to a robot wrist and aims to solve the problems of complex structure, heavy weight, high control difficulty and low integration level existing in the conventional robot wrist. One of two input bases of a torque sensor is connected with a first driven bevel gear of a differential mechanism while the other is sleeved on a driven shaft of the differential mechanism; a support block is arranged on a bracket bottom plate of a support bracket; the differential mechanism is supported by the support block and two support arms of the support bracket; a driving frame is connected with the support bracket through a pre-tightening mechanism; first and second drivers are fixed on the driving frame and have opposite transmission directions; the first and second drivers are in transmission connection with first and second driving half shafts of the differential mechanism through first and second toothed belt transmission mechanisms; first and second position sensors are arranged on the first driving half shaft of the differential mechanism; and a tail end circuit board is fixedly arranged on an output base of the torque sensor. The robot wrist has the advantages of simple structure, light overall weight, easy control, high integration level and wrist pitching and deflection degrees of freedom.

The invention relates to a waste crushing treatment device for 3D printing, in particular to a waste cam crushing treatment device for 3D printing. The technical problem to be solved by the invention is to provide the waste cam crushing treatment device for 3D printing with good crushing effect, high working efficiency and simple operation. In order to solve the technical problem, the invention provides the waste cam crushing treatment device for 3D printing; the waste cam crushing treatment device for 3D printing comprises a baseplate, a left frame, a first spring, a first bearing base, an L-shaped connecting rod, a rack, a first rotating rod, a first bevel gear, a base, a crushing frame, a second bearing base and the like; and the left frame, the first spring, the first bearing base and the L-shaped connecting rod are arranged at the top of the baseplate in sequence from left to right. The waste cam crushing treatment device for 3D printing achieves the effects of good crushing effect, high working efficiency and simple operation, is novel in structure and high in practicability, and can quickly crush wastes to improve the enterprise working benefit.

The invention discloses a humanoid flexible mechanism arm device which comprises five fingers which are driven by six motors. Modular structures with same structures are adopted on four fingers (an index finger, a middle finger, a third finger and a little finger). Special effects of finger coupling transmission are achieved by a manner that the one motor, a reduction gearbox, a transmission mechanism and a flexible body are comprehensively utilized on the modular fingers. A thumb is driven by two motors, a pair of duplex bevel gears and a cross-shaped shaft are applied on a base joint transmission system to achieve buckling and side-sway movements, and good transmission effects and arrangement of the thumb and a palm are achieved. Each finger is provided with three joints which include a base joint, a middle joint and a far joint, the speed ratio is close to 1: 1: 1, and the mechanical arm is enabled to be close to a movement pattern of a hand. The humanoid flexible mechanical arm device has the advantages of being large in fingertip output force and rigidity, compact in structural arrangement, high in humanization degree, stable in grab and the like.

The invention discloses a water surface floating plant fishing device, which comprises a stander, a power mechanism, a fishing mechanism (1), a cutting mechanism and a compression collecting mechanism. The fishing mechanism (1) is positioned at one end of the stander; the cutting mechanism is positioned in the middle of the stander; the compression collecting mechanism is positioned under the cutting mechanism and fixed at one end of a bottom beam (11) of the stander; and the power mechanism drives the fishing mechanism, the cutting mechanism and the compression collecting mechanism through a chain wheel. The fished aquatic plant is conveyed into a cutting box (9); a bevel gear (16) drives a cutter (4) to do vertical reciprocating motion through a cam shaft (20) to cut the aquatic plant; the cut aquatic plant is compressed through the reciprocating motion of a compression plate (22); and the intermittent motion of a movable bottom plate (39) under the compression box is realized through an incomplete gear (10) so that the compressed aquatic plant falls into a collecting device. The device integrates fishing, cutting, compressing and collecting, replaces manual fishing, is suitable for various water aircrafts, and has the characteristics of high efficiency and convenient use.

The invention discloses an efficient concrete stirring device for civil engineering construction. The efficient concrete stirring device for civil engineering construction comprises a bottom plate, wherein a left vertical column and a right vertical column are vertically and fixedly installed on the bottom plate, a top plate is horizontally and fixedly installed at the upper ends of the left vertical column and the right vertical column, a slide plate is horizontally and slidably arranged on a limit hanging frame, a second rack is arranged on the front surface of the slide plate, a horizontalextension plate is horizontally and fixedly installed on the right sidewall of the left vertical column, and a second bevel gear in engagement connection with a first bevel gear and a third bevel gearis rotationally arranged on a support; and a limit sleeve is arranged on the outer sidewall of a gantry stirring frame, and a slide rod is horizontally and slidably arranged on the limit sleeve. Theefficient concrete stirring device for civil engineering construction is ingenious in structure and reasonable in design; the gantry stirring frame drives stirring blades on the inner sidewall of thegantry stirring frame to stir concrete while a stirring shaft drives the stirring blades to carry out rotary stirring on the concrete in a stirring bucket; and moreover, the rotation directions of thegantry stirring frame and the stirring shaft are opposite, so that the stirring efficiency for the concrete is greatly increased, and the mixing effect for the concrete is promoted due to the rotation of the stirring bucket.

Electrical equipment cabinet having convenient movement and heat dissipation functions includes a cabinet body and support legs arranged under the cabinet body, a rotating shaft is arranged on a bottom plate of the cabinet body, the upper end of the rotating shaft is connected with a motor located in the cabinet body at the bottom, the lower end of the rotating shaft is fixedly connected with a first bevel gear, the first bevel gear engages with a second bevel gear, the second bevel gear is fixedly connected with a middle position of a horizontally arranged rotary rod, two ends of the rotary rod are fixedly provided with third bevel gears, the third bevel gears engage with fourth bevel gears, the fourth bevel gears are fixedly arranged on screws, and the top ends of the screws are rotatably connected with the lower end of the cabinet body. The electrical equipment cabinet has the beneficial effects that mutual conversion between a stable state and a moving state of the cabinet body is realized by utilization of transmission of the bevel gears; and through cooling treatment on air, cooling of the inside of the cabinet body is realized, thereby effectively guaranteeing normal work of electrical equipment, and preventing occurrence of a fire disaster.

The invention discloses an extrusion granulation device for feed processing, which comprises a granulation box, a drive motor is arranged on the top of the granulation box, a transmission shaft is connected to the output shaft of the drive motor, and a coaxial fixed installation is installed on the transmission shaft. The driving pulley and the turntable, the connecting rod is hinged at the side edge of the turntable; the driven pulley is rotated on the granulation box, and the driving belt is wound between the driven pulley and the driving pulley, and the driven pulley is the same The shaft is fixedly installed with a driving bevel gear; the surface of the rotating shaft is provided with a helical blade; the extrusion die is installed horizontally in the granulation box, the horizontal limit sleeve is horizontally installed on the inner wall of the right side of the granulation box, and the left end of the slider is connected with a Several cutting blades are arranged parallel to each other, and the baffle is in contact with the disc cam; the slider drives the cutting blades to cut the feed extruded from the extrusion die, making the feed more refined and uniform, and effectively avoiding feed blockage The extrusion die head greatly improves the efficiency of feed processing and granulation.

The invention discloses a biped robot capable of walking rapidly. The biped robot is composed of a servo motor, a motor support, a driving bevel gear, driven bevel gears, check pawls, ratchet wheel cam sets, ratchet wheel connecting pins, a driving pawl, oscillating bars, roller connecting pins, rollers, shanks, compression springs, screws, thighs and feet. The servo motor drives the driving bevel gear to rotate so as to drive the symmetrically-arranged driven bevel gears to rotate oppositely and the thighs to swing forwards and backwards; the shanks always make contact with cams in the ratchet wheel cam sets through the compression springs and supporting legs are longer than swinging legs through telescopic motion of the shanks. Compared with the prior art, the biped robot has the advantages that the robot can be driven by one servo motor, so that the robot is convenient to control and high in control accuracy; except for the servo motor, other structures of the robot are all mechanical structures, so that motion cooperation is convenient; the structure is simple, machining and installation are convenient, and the robot can walk rapidly.

An improved elevating table apparatus provides a plurality of at least three telescoping legs that support a table top having an underside and an upper surface that provides a work surface upon which can be placed computers, office equipment and the like. A gear cluster is provided at the top of each leg that includes a plurality of gears, preferably bevel gears, that are engaged during use. Each leg has a hollow interior that holds a generally vertically extending, externally threaded rod, the rod having an upper end portion with a gear that forms a part of the gear cluster and a lower end portion that threadably engages a section of the leg. A single crank provides a drive shaft with a gear that forms a part of one of the gear clusters. A plurality of connecting linkages or connecting rods are provided that connect a center of the gear clusters to each of a pair of side gear clusters. When the single crank is rotated, all of the gear clusters and connecting rods or linkages rotate, each connecting rod or linkage having a gear at a connecting rod or linkage end portion that forms a part of a gear cluster. In this fashion, the crank can be rotated in one rotational direction that extends the length of each of the legs and elevates the table top. When the crank is rotated in an opposite rotational direction, all of the legs shorten in length so that the table top is lowered.

A drive connection mechanism has a sliding unit which is fixed to a drive shaft extending through the photoconductive drum, a convex coupling gear which has three coupling members fixed slidably to splines formed in the periphery of the sliding unit, a compressing spring which energizes the coupling gar, and a concave coupling gear which is provided in the drum to receive and fit the convex coupling gear. When the convex coupling gear is pressed to the concave coupling gear, a force from the tapered surface to the inside acts on each coupling member. Then, the bevel gear of the convex coupling gear is stuck to the bevel gear of the concave coupling gear, the internal gears of the convex coupling gear is stuck to the splines of the drive shaft, and the centers of the drive shaft and photoconductive drum are aligned.