2426 results about "Four-bar linkage" patented technology

A heart valve sizing system featuring a lumen advanceable in vasculature, an inside caliper device at the distal end of the lumen, and a readout for reading the dimension gauged by the inside caliper device. In the preferred embodiment, the inside caliper device includes a four bar linkage with first and second opposing pivot points and third and fourth opposing pivot points and a push rod connected to the second pivot point for alternatively urging the third and fourth pivot points together when extended and urging the third and fourth pivot points apart when retracted to gauge the inside dimension of the vasculature.

An in-plane shear and multi-axial tension or compression testing apparatus having four-bar linkages pivotable to two sleeves on an opposite vertices with the sleeves of each vertex rotationally attached to each other. Lateral links of each linkage are pivotally attached to load transfer plates in which the plates secure a test specimen. Each linkage is rotatable to the other linkages while the vertices are subjected to a compression or tensile load. The vertices are also capable of rotation by a testing machine for shear testing. During compression or tension of the vertices of the apparatus, the plates respectfully move toward or away from each other thereby applying compression or tension to the specimen. The bars of one linkage can be rotated with respect to the other, thereby applying torsional loading to the specimen.

The invention provides a fracturing blender truck. The fracturing blender truck comprises a chassis, a sand blending device, a four-connecting-rod mechanism and a power system. The sand blending device is arranged above the chassis and provided with a sand blender, and a closed-type mixing pump serves as the sand blender. The four-connecting-rod mechanism is capable of driving the sand blending device to move to enable a base of the closed-type mixing pump to contact with the ground, a first connecting rod and a third connecting rod of the four-connecting-rod mechanism are arranged on the chassis rotatably, and the sand blending device is arranged on a second connecting rod of the four-connecting-rod mechanism. The power system arranged on the chassis is connected with the first connecting rod and drives the four-connecting-rod mechanism to rotate to enable the closed-type mixing pump to contact with the ground. The fracturing blender truck has the advantages that the closed-type mixing pump serves as the sand blender, and the second connecting rod of the four-connecting-rod mechanism is used for bearing the sand blending device to enable the base of the closed-type mixing pump to be capable of contacting with the ground, so that the height of the closed-type mixing pump is decreased, suction capacity of the closed-type mixing pump is improved, a great quantity of fracturing fluid can be guided out, delivery capacity of the fracturing blender truck is increased, and the requirements on large-scale fracturing operation can be met.

An exercise machine composed of a frame, a first four bar linkage system, a second four bar linkage system, and a means for transferring an incident force from the legs of a user is disclosed. The first four bar linkage system is operably mounted on the frame and operably connects the transferring means to the frame to allow for back and forth movement of the transferring means along a path of travel about an instantaneously changing axis of rotation. The second four bar linkage system operably engages the first four bar linkage system. Either or both of the first four bar linkage system and the second four bar linkage system are operably connected to a resistance means, whereby the second four bar linkage system operates in conjunction with the first four bar linkage system and the resistance means to create a mechanical disadvantage to the user.

An electric powered self-balancing unicycle may include a single wheel assembly having a drive system substantially contained within the wheel, a frame and handlebars including a four-bar linkage mechanism pivotably connected to the wheel assembly by a fork.

Electronic devices may be provided that contain multiple housing portions. The housing portions may be coupled together using hinges. The hinges may include hinges based on a three-bar linkage, hinges based on a four-bar linkage, hinges with slotted members, hinges formed from flexible support structures, and hinges based on flexible housing structures. Flexible displays may be mounted to the housing portions overlapping the hinges. When the housing portions in a device are rotated relative to each other, the flexible display may bend. The hinge may be configured to allow the flexible display to be placed in a front-to-front configuration in which an active side of the display faces itself or a back-to-back configuration. Engagement structures may be used to help the housing grip external objects and to hold the housing portions together. The hinges may be provided with rotational detents to help hold the flexible display in desired positions.

The invention discloses a folding baby chair capable of adjusting back slope, comprising a chair seat, a chair back, shank supports, handles arranged on two sides of the chair seat and a lock mechanism for adjusting back slope. One end of the chair seat is pivoted to a lower end of the chair back to form a first pivot pint and the other end is pivoted to the shank supports to form a third pivot pint. One end of the handle is pivoted to the chair back to form a second pivot pint which is located above the first pivot pint, and the other end is pivoted to upper ends of the shank supports to form a fourth pivot pint which is located above the third pivot pint. Accordingly, the baby chair form s a four-bar link mechanism; the chair back can drive the shank supports to rotate and meanwhile to extend or collapse; the lock mechanism can be arranged between any two of the chair seat, the chair back, the shank supports and the handles to lock the two and can operatively release lock between the two. The baby chair is simple and practical, has good stability when tilt to the back side and can optimally collapse in folding.

Techniques for operating a personal communication structure (PCS) are described. A personal communication structure (PCS) may include a frame, a housing, and a mounting system coupling the housing to the frame. The mounting system may include a plurality of four-bar linkages. Each of the four-bar linkages may include two links, first pin joints coupling first ends of the respective links to the frame, and second pin joints coupling second ends of the respective links to the housing. Rotation of the links of the mounting system results in displacement of the housing relative to the frame along an arcuate path.

A synchrotilt chair includes a base, a back, a seat, and a pair of parallel links pivoted to a rear of the base and to a bottom of the back to form a four-bar linkage arrangement. A spring arrangement includes leaf springs that extend between each link and the base to bias the link and in turn the back and seat toward an upright position, with the back and seat pivoting with a synchronous motion upon recline of the back. The base, the back, the seat, and the links are shaped to receive identical chairs along a stacking direction to form a densely nested stacked arrangement for compact storage. The base has a distinctive horizontal U-shaped mid-frame structure defining a plurality of corners, and further having up legs and down legs extending upwardly and downwardly, respectively, from each of the corners, with the pair of links attached to the two rearmost ones of the up legs. The base (and also separately the back and the seat structures) are injection molded as single pieces from a reinforced polymeric material in a manner that provides a lightweight, yet surprisingly rigid and sturdy construction. Armrests are pivoted to the back and have a shape configured to allow nested stacking while also providing excellent comfort, durability, and style.

A combined mobile container inspection system, comprising: a radiation source; a chassis; a rotatable deck provided at an end of the upper surface of said chassis and rotatable with respect to said chassis, provided with a parallelogram bracket formed by a hingedly-connected four-bar linkage mechanism, wherein the cross link of the parallelogram bracket extends to form a horizontal cross arm with detectors, the other end of said horizontal cross arm is connected with a vertical upright arm, which is vertical or parallel to said horizontal cross arm; and a sliding deck provided at the rear end of the rotatable deck and movable upwardly and downwardly, said sliding deck is provided, in turn, with the radiation source, the X-ray therefrom is always right in the face of the detectors provided in the horizontal cross arm and vertical upright arm, calibrator and collimator.

The invention involves an artificial leg for human-simulating double-foot robot and is within the scope of robot technology. The artificial leg consists of the coax joint, knee joint, anklebone, foot, thigh connecting rod and calf connecting rod, characterized in that a knee joint driving motor is equipped on the thigh connecting rod between the coax joint and the knee joint. The knee joints are two closed-chain structure comprising of four connecting rods. The knee joint driving motor is connected with the rear rods of the four-connecting-rod structure through the parallel four connecting rod mechanism. A stop piece is fixed on the front end of the four-connecting-rod mechanism. An encoder is equipped on the spindle, which is located on the upper end of the four-connecting-rod mechanism. The advantages of this invention are: the distance between the lifted foot and the ground is increased, enhancing the robot's ability of avoid obstacles while it is walking; the calves don't tough the ground during their swinging process, improving the robot's stability and efficiency in walking; the mass distribution in the leg is more similar to that of human being, producing a compact overall structure and high precision in transmission.

An adjustment mechanism for directional recessed luminaires includes a tilt adjustment screw 104 and rotation adjustment screw 124 supported in adjacent positions on a bearing ring 102, the screws being oriented vertically and conveniently accessible through an open center of the bearing ring. Follower 106 travels vertically on the tilt adjustment screw when rotated. Drive link 108 connected to both the follower and a four bar linkage (110), transfers force from the follower to the linkage when the tilt screw is rotated. The linkage pivots about anchor points 114,116 and is pivotally connected to lamp carrier frame 118 supporting light source 105. When the tilt adjustment screw is rotated, light source moves along a path (FIG. 6, 7) to aim the light beam. After aiming, the mechanism locks the light source into place. The mechanism is compact and the adjustment screws are easily accessible from beneath the mechanism.

A bicycle frame with a counter-rotating four bar linkage system includes a front frame section, a rear frame section, and a shock absorber. The front frame section includes a top tube, a head tube, a seat tube, a bottom bracket, a down tube and a pivoting base formed on the down tube near the bottom bracket. The rear frame section is connected pivotally to the front frame section and has two seat stays, two chain stays, two dropouts, a connecting member, an upper linkage member, a lower linkage member and a parabolic virtual pivot (PVP). The PVP moves in a forwardly and upwardly parabolic trajectory and the dropouts of the rear frame section move in a nearly vertical trajectory when the rear frame section is pivoting.

An exercise device includes a frame, a pair of foot supports, and at least one four-bar linkage assembly coupled to the frame. The at least one linkage assembly is coupled to at least one of the foot supports. The four-bar linkage assembly directs the foot support in a generally elliptical motion while in use. The generally elliptical motion defines a major dimension extending at an angle from horizontal that is within the range of about thirty degrees (30°) to about seventy-five degrees (75°) and the major dimension having a length that is within the range of about ten inches to about eighteen inches.

A folding electric scooter comprises a chassis. The front end of the chassis is disposed with a front wheel and a handlebar used to control the direction of the front wheel. The handlebar is a folding structure. The rear end of the chassis is pivotally coupled with a rear rack. The rear rack is disposed with a rear wheel, a motor and a battery. The motor and the battery are used to offer the power to the rear wheel. In addition, the rear rack is disposed with a folding four-bar linkage, which forms the seat. By such arrangements, when the folding electric scooter is not in use, the four-bar linkage can be folded to fold the seat, and the handlebar can be synchronously folded, thus minimizing the whole volume to facilitate the transportation and the storage.

A testing apparatus having four-bar linkages pivotable to sleeves on opposite vertices with the sleeves of each vertex rotationally attached to each other. Links of each linkage are pivotally attached to loading plate assemblies securing a test specimen. During loading, the assemblies move toward or away from each other; thereby, applying compression or tension to the specimen. A pressure system fluidly impacts opposite faces of a piston of the assembly such that one of the faces is pressurized and impacts arms of the assembly for a sliding motion to move toward or away from the longitudinal axis of the apparatus thereby, applying a compression or tensile load on the specimen or augmenting the loads applied by the movement of the loading plate assemblies. The pressure system includes a controller connected to a reservoir, a pressurized source, a plurality of shutoff valves and pressure-adjustable check valves.

A seat assembly having a seat back (11), a generally horizontal seat cushion (14), and a recliner mechanism (20) allowing for pivotal adjustment of the seat back about a first pivot axis (21) relative to the seat cushion and displacement of the first pivot axis about a second pivot axis (22) between forward and rearward positions. With the first pivot axis (21) in the forward position, the seat back is adjustable about the first pivot axis (21) between a plurality of reclined seating positions. With the first pivot axis in the rearward position, the seat back is adjustable about the first pivot axis between one of the reclined seating positions and a stowed position generally aligned against the seat cushion. The seat cushion is pivotally adjustable about a four bar linkage (17, 18) between a seating position and a stowed position. A link (80) interconnects the seat back and the seat cushion allowing movement of both the seat back and the seat cushion together between the respective seating and stowed positions.