Abstract: A foldable device includes a pivot base, three supporting rods, at least one folding rod unit, a linkage rod, and a pivot member that is located above the pivot base. The linkage rod has a pivot section that is pivotably connected to the pivot member, and a moving section that is opposite to the pivot section. The at least one folding rod unit is pivotably connected to one of the supporting rods. The moving section of the linkage rod is slidably mounted to the at least one folding rod unit. The at least one folding rod unit includes a folding rod that has a connecting section and a swing section, and that is movable relative to the one of the supporting rods between a folded position, in which the moving section of the linkage rod is adjacent to the swing section of the folding rod, and an expanded position.

Abstract: A foldable chair includes a support unit, a sliding base, and a seat unit. The support unit includes a pivot base, a main support rod and two auxiliary support rods connected to the pivot base. The sliding base is sleeved on the main support rod. The seat unit includes a seating subunit connected to the sliding base. The seat unit further includes a linkage subunit that includes a first linkage rod connected to the pivot base, a second linkage rod connected to the first linkage rod and the sliding base, and a resilient member between the pivot base and the first linkage rod. The seating subunit is convertible between a folded state and an expanded state. The resilient member biases the end of the first linkage rod distal from the pivot base away from the main support rod.

Abstract: A folding crutch chair includes a pivot base unit, a primary leg unit, at least two support leg units, a positioning unit and a seating unit. The leg units are mounted on the pivot base unit. The positioning unit is mounted on the primary leg unit, and has a mounting seat and a positioning member. The positioning member has a guiding slope surface. A seating member of the seating unit is shiftable between a collapsed position and a seated position. During the operation from the seated position to the collapsed position, the seating member is actuated to move the guiding slope surface to generate a retention force for keeping the seating member unmoved relative to the positioning member so as to facilitate the folding operation.

Abstract: A folding crutch chair includes a pivot base unit and at least three support leg units. The pivot base unit has at least three mounting slots angularly spaced apart from one another about an axial line, and at least three pairs of joint portions respectively formed in the mounting slots. Each support leg unit includes a pivot seat, an outer tubular piece, and an inner tubular piece extending telescopically relative to the outer tubular piece. The pivot seat has a pair of pivot portions respectively and pivotably connected with the joint portions such that each support leg unit is rotatable relative to the pivot base unit. The support leg units are shiftable between a folded state and an unfolded state. The length of the support leg units is reduced when folded so as to facilitate packaging, storage and carrying.

Abstract: A foldable device includes a pivot base having a through hole and two support holes extending through a base seat for a shaft member and two support shafts to extend therethrough. The shaft member extends along a central axis and is pivotably connected with the base seat about a rotating axis such that the shaft member is rotatable between a ready position and a swung position. The biasing member is interposed between the base seat and the shaft member to have a torque which urges the shaft member to rotate toward the swung position. During rotation of the shaft member to the swung position, the shaft member actuates the support shafts to rotate and spread relative to the base seat and to be inclined and intersect one another.

Abstract: A pivot shaft assembly for a foldable device includes a base seat, a shaft member and a locking member. The base seat has a through hole and an engaging portion. The shaft member extends through the through hole, includes a fixed tubular piece with a radial hole, and is rotatable relative to the base seat. The locking member includes a locking portion movably disposed in the radial hole. The locking portion is movable through the radial hole to engage with the engaging portion to position the pivot shaft assembly in a locked state so as to prevent rotation of the shaft member relative to the base seat, and is movable inwardly of the fixed tubular piece to disengage from the engaging portion to make the pivot shaft assembly in a released state so as to permit rotation of the shaft member relative to the base seat.

Abstract: A foldable device includes a pivot seat, at least one leg rod unit including a leg rod that extends through the pivot seat, and a limiting member that is mounted to the leg rod, at least one connecting member pivoted to the leg rod and having a connecting segment, and a pivot unit including at least one biasing member. When the at least one connecting member is substantially collinear with the leg rod, the at least one connecting member is, under exertion of an external force, movable relative to the leg rod to a limiting position. When the external force is released, the at least one connecting member is biased by a resilient force of the at least one biasing member to move relative to the leg rod from the limiting position to a releasing position.

Abstract: A foldable device includes a pivot base, three supporting rods, at least one folding rod unit, a linkage rod, and a pivot member that is located above the pivot base. The linkage rod has a pivot section that is pivotably connected to the pivot member, and a moving section that is opposite to the pivot section. The at least one folding rod unit is pivotably connected to one of the supporting rods. The moving section of the linkage rod is slidably mounted to the at least one folding rod unit. The at least one folding rod unit includes a folding rod that has a connecting section and a swing section, and that is movable relative to the one of the supporting rods between a folded position, in which the moving section of the linkage rod is adjacent to the swing section of the folding rod, and an expanded position.

Abstract: A pivot shaft assembly includes a shaft member extending through a base seat and including a fixed tubular piece pivotably connected with the base seat, and a movable tubular piece movably disposed within the fixed tubular piece. The fixed and movable tubular pieces respectively have a retreated hole and a through hole extending radially. A fastening member has an engaging protrusion resiliently projecting from the through hole. In a fastened state, the shaft member is inclined and the through hole is aligned with the retreated hole to permit the engaging protrusion to extend through the retreated hole so as to retain the movable tubular piece to the fixed tubular piece. During shifting to a releasable state where the shaft member extends parallel, the engaging protrusion is pressed by a fastener releasing portion and retreated into the retreated hole to permit movement of the movable tubular piece.

Abstract: A telescopic rod device includes an outer tube including adjustment holes, an inner tube having a through hole, an actuator unit mounted inside the inner tube and has an actuating portion, and an adjustment control unit having a restraining member that has a restraining portion, a resilient member, and a lug connected with the resilient member and protruding from the through hole to engage with an adjustment hole. The resilient member biases the lug to extend out of the through hole and engage an adjustment hole, and when the actuator unit moves relative to the inner tube, the actuating portion of the actuator unit actuates movement of the restraining portion, and the restraining member acts on the resilient member so that the lug disengages the adjustment hole.

Abstract: A telescopic rod device includes an outer tube including adjustment holes, an inner tube having a through hole, an actuator unit mounted inside the inner tube and has an actuating portion, and an adjustment control unit having a restraining member that has a restraining portion, a resilient member, and a lug connected with the resilient member and protruding from the through hole to engage with an adjustment hole. The resilient member biases the lug to extend out of the through hole and engage an adjustment hole, and when the actuator unit moves relative to the inner tube, the actuating portion of the actuator unit actuates movement of the restraining portion, and the restraining member acts on the resilient member so that the lug disengages the adjustment hole.

Abstract: A foldable chair includes a support unit, a sliding base, and a seat unit. The support unit includes a pivot base, a main support rod and two auxiliary support rods connected to the pivot base. The sliding base is sleeved on the main support rod. The seat unit includes a seating subunit connected to the sliding base. The seat unit further includes a linkage subunit that includes a first linkage rod connected to the pivot base, a second linkage rod connected to the first linkage rod and the sliding base, and a resilient member between the pivot base and the first linkage rod. The seating subunit is convertible between a folded state and an expanded state. The resilient member biases the end of the first linkage rod distal from the pivot base away from the main support rod.

Abstract: A folding crutch chair includes a pivot base unit and at least three support leg units. The pivot base unit has at least three mounting slots angularly spaced apart from one another about an axial line, and at least three pairs of joint portions respectively formed in the mounting slots. Each support leg unit includes a pivot seat, an outer tubular piece, and an inner tubular piece extending telescopically relative to the outer tubular piece. The pivot seat has a pair of pivot portions respectively and pivotably connected with the joint portions such that each support leg unit is rotatable relative to the pivot base unit. The support leg units are shiftable between a folded state and an unfolded state. The length of the support leg units is reduced when folded so as to facilitate packaging, storage and carrying.

Abstract: A folding crutch chair includes a pivot base unit, a primary leg unit, at least two support leg units, a positioning unit and a seating unit. The leg units are mounted on the pivot base unit. The positioning unit is mounted on the primary leg unit, and has a mounting seat and a positioning member. The positioning member has a guiding slope surface. A seating member of the seating unit is shiftable between a collapsed position and a seated position. During the operation from the seated position to the collapsed position, the seating member is actuated to move the guiding slope surface to generate a retention force for keeping the seating member unmoved relative to the positioning member so as to facilitate the folding operation.

Abstract: A foldable supporting device includes a linkage unit, a supporting unit and a converting unit. The supporting unit includes a main supporting member that has a first main supporting surface, and at least one auxiliary supporting member that has a first auxiliary supporting surface. The converting unit has at least one converting part that is drivable by movement of the linkage unit to convert the supporting unit between a folded state in which the first main supporting surface and the first auxiliary supporting surface cooperatively form a first angle, and an unfolded state in which the first main supporting surface and the first auxiliary supporting surface cooperatively form a second angle.

Abstract: A folding mechanism includes a pivot seat unit and at least three support units disposed about an axial line and pivotally connected to the pivot seat unit. Each of the support units includes a support rod. Rotation of any one of the support rods of the support units relative to the pivot seat unit drives an adjacent one of the support rods to rotate, such that when any one of the support rods is rotated relative to the pivot seat unit, the other support rods are in turn driven to rotate relative to the pivot seat unit so as to convert the support units between a folded state and an unfolded state.

Abstract: A foldable supporting device includes a linkage unit, a supporting unit and a converting unit. The supporting unit includes a main supporting member that has a first main supporting surface, and at least one auxiliary supporting member that has a first auxiliary supporting surface. The converting unit has at least one converting part that is drivable by movement of the linkage unit to convert the supporting unit between a folded state in which the first main supporting surface and the first auxiliary supporting surface cooperatively form a first angle, and an unfolded state in which the first main supporting surface and the first auxiliary supporting surface cooperatively form a second angle.

Abstract: A folding mechanism includes a pivot seat unit and at least three support units disposed about an axial line and pivotally connected to the pivot seat unit. Each of the support units includes a support rod. Rotation of any one of the support rods of the support units relative to the pivot seat unit drives an adjacent one of the support rods to rotate, such that when any one of the support rods is rotated relative to the pivot seat unit, the other support rods are in turn driven to rotate relative to the pivot seat unit so as to convert the support units between a folded state and an unfolded state.

Abstract: A rope guiding device includes a base seat, two limiting link assemblies connected to the base seat, and a limiting rope. Each of the limiting link assemblies has a retaining space therein, and a guiding groove in spatial communication with the retaining space. The limiting rope includes two head pieces respectively and movably retained in the retaining spaces of the limiting link assemblies, and a rope body having two opposite end portions that respectively extends through the guiding grooves of the limiting link assemblies and that are respectively connected to the head pieces. Each of the head pieces has a width greater than the width of each of the guiding grooves and the width of the rope body.

Abstract: A foldable chair includes a main stick, a fold unit and a retention unit. The fold unit includes a middle slider member movable along the main stick between lower and upper positions, and a foldable support leg connected to the middle slider members. The retention unit is configured to prevent fold operation of the support leg when the middle slider member is at the lower position, and to permit the fold operation of the support leg when the middle slider member is at the upper position.