Abstract: A bicycle component for an at least partially muscle-powered bicycle, including a seat post device adjustable between two positions, with two support members telescopically movable relative to one another in the axial direction namely, a first support member and a second support member. The bicycle component has an anti-twist protection with a clamping element that non-rotatably couples the support members together, and which is displaceably received in a guiding groove, so that rotational movement of the first support member relative to the second support member can be at least partially blocked. The anti-twist protection includes a spline device with a spline unit that can be pressed against the clamping element in the axial direction. By pressing the clamping element and the spline unit together, the clamping element can be moved relative to the guiding groove transverse to the axial direction.

Abstract: A dropper seatpost head assembly is disclosed. The assembly includes a lower post for insertion into a seat tube of a vehicle and an upper post having a housing coupled at one end thereof, the upper post to telescopically slide with respect to the lower post to form a dropper seatpost. The assembly also includes a saddle rail clamp assembly having a lower saddle rail clamping portion rotatably coupled with the housing and an upper saddle rail clamping portion to couple with the lower saddle rail clamping portion to form a clamping structure. The lower saddle rail clamping portion having a drooped shape such that the lower saddle rail clamping portion and the clamping structure hang down in a plane that intersects at least a portion of the housing.

Abstract: A seat post head assembly is disclosed. The assembly includes a housing coupled to a seat post, the housing including a cylindrical bore, and a first and second threaded chamber. A rotatable core is inserted into and rotates within the cylindrical bore, the rotatable core including a seat rail clamp assembly to fixedly clamp a set of seat rails and provide independent adjustment of a fore-aft location of the seat without affecting a pitch of the seat. The assembly additionally includes a first threaded member that threads into the first threaded chamber, contacts the rotatable core, and adjusts the pitch of the seat without affecting the fore-aft location of the seat. The assembly also includes a second threaded member that threads into the second threaded chamber, contacts a different portion of the rotatable core, and provides a physical hard stop against a change in the pitch.

Abstract: A quick-release mechanism enables the saddle of a cycling apparatus to be removed and installed to and from the cycling apparatus without the use of tools. The upper portion of the quick-release mechanism couples directly to the rails of the saddle. The lower portion of the quick-release saddle adapter is pivotally coupled to a saddle mounting post or secured to the cycling apparatus in place of the saddle by using the mechanism intended for mounting the cycling saddle. The quick-release mechanism may also be integrated into a standard cycling apparatus mount post.

Abstract: A bicycle seatpost assembly comprises a first tube, a second tube, and a positioning structure to relatively position the first tube and the second tube. The positioning structure is mounted to at least one of the first tube and the second tube and is configured to change a state of the bicycle seatpost assembly among a first adjustable state in which the second tube is retracted or extended relative to the first tube at a first speed in response to a reference force applied to the second tube, and a second adjustable state in which the second tube is retracted or extended relative to the first tube at a second speed in response to the reference force applied to the second tube. The second speed is lower than the first speed.

Abstract: A bicycle seat assembly includes a mounting platform that includes one or more bicycle seat post attachment members and a receiving member for receiving thereon or therein a portion of a bicycle seat. The mounting platform includes a quick release locking mechanism, which includes a lever attached to a bolt, which is assembled to a locking lug arranged to move and lock against a locking surface formed in the portion of the bicycle seat.

Abstract: The present invention relates to a bicycle provided with a movable saddle, which comprises: the movable saddle; a saddle moving module connected to the movable saddle and coupled with the seat post area of a bicycle frame so as to move the movable saddle in the direction of travel of the bicycle or in the opposite direction as a wire is pulled or pushed; and a control lever provided in the handle area of the bicycle, wherein the wire is bound thereto, for controlling the pulling or pushing of the wire.

Abstract: A seat structure with function of suspension includes a seat tube and a cushion body installed on the seat tube. The seat tube and cushion body are made of carbon-fiber materials. The cushion body includes an integrated seat and a bracket. The bracket is installed on the seat tube. The bracket is an arc piece. The front end of the bracket and the front end of the seat are integrally molded and connected to form a first angle. The rear end of the bracket and the rear end of the seat are integrally molded and connected to form a second angle. The first angle and the second angle are less than 90°, thereby enabling the seat being good elasticity relative to the bracket, which can effectively reduce the vibration transferred from the seat tube. The seat structure has larger elasticity coefficient and better effect of damping.

Abstract: A bicycle frame includes a seat tube, two chain stays and a down tube connected to the seat tube. A seat post is inserted into the seat tube and has a seat connected thereto. The chain stays is connected to a rear wheel and a head tube is connected to the down tube. A front fork is connected to the head tube. A tubular body is connected to the bicycle frame and the wall of the tubular body has a first slot. The seat tube is connected to a slide which is connected to the wall of the tubular body. A pin extends through the slide and the first slot. A first securing member and a second securing member are connected to two ends of the pin. The first and second securing members connect the wall of the tubular body to the slide.

Abstract: The present invention relates to a bicycle provided with a movable saddle, which comprises: the movable saddle; a saddle moving module connected to the movable saddle and coupled with the seat post area of a bicycle frame so as to move the movable saddle in the direction of travel of the bicycle or in the opposite direction as a wire is pulled or pushed; and a control lever provided in the handle area of the bicycle, wherein the wire is bound thereto, for controlling the pulling or pushing of the wire.

Abstract: A seat adjusting module suitable to connect the saddle including at least a seat rail and a seat tube of a bicycle is provided, wherein the module includes a base assembled to an end of the seat tube, a clamp unit including two clamp elements and a fastening unit including two fasteners. The first clamp element has at least a first clamp portion and a shaft portion matched to the base at a first or a second position so as to rotate relatively to the base on a first or a second rotation axis. The second clamp element has at least a second clamp portion, which with the first clamp portion together clamps the seat rail. The two fasteners together fasten the two clamp elements to the base so that the first and second clamp portions together clamp tightly the seat rail.

Abstract: A motorcycle backrest assembly includes a base assembly having first and second ends and a back rest rotatably connected to the first end of the base assembly such that the back rest is movable between first and second positions. A mounting plate has the second end of the base assembly rotatably connected thereto such that the base assembly is movable between first and second positions. The backrest assembly includes a first configuration as a passenger back rest where the backrest is in the first position and the base assembly is in the first position, and a second configuration as a driver backrest where the backrest is in the second position and the base assembly is in the second position.

Abstract: A bicycle seat is provided that allows for dynamic adjustment of longitudinal seat position when a locking mechanism is unlocked. In one embodiment, the unlocking is accomplished by lifting the nose of the seat body away from the base, thus providing the capability of dynamic adjustment of longitudinal or fore-aft seat position while riding without the component complexity and aerodynamic drag limitations of prior art devices. In an alternative embodiment, a bolt protruding from the seat body is retracted to disengage the locking mechanism and allow dynamic adjustment of longitudinal seat position without lifting the nose of the seat body. A vertical adjustment corresponding to the longitudinal position of the seat is taught to maintain, if desired, the same distance between bike seat and pedals for any longitudinal position of, the seat.

Abstract: A bicycle seat clamp assembly includes a body having opposing side faces with an arched first and second lower guide rail outwardly project therefrom, respectively. A first wing clamp is positioned on the first lower guide rail while a second wing clamp is positioned on the second lower guide rail. A primary fastener attaches the first wing clamp and the second wing clamp to the body, the primary fastener being movable between a first position wherein the first wing clamp and the second wing clamp are rigidly fixed to the body and a second position wherein the first wing clamp and the second wing clamp can freely slide along the first lower guide rail and the second lower guide rail, respectively. Structure is also provided for releasably securing a bicycle seat to the first wing clamp and the second wing clamp independent of movement of the primary fastener.

Abstract: A bicycle seat height adjustment method is provided for changing a height of a bicycle seat. The method includes operating an operating device to output a seat raising command which is received by a motorized seat height adjustment mechanism to adjust the seat height. The method further includes releasing the operating device after the operating of the operating device. The method further includes raising the bicycle seat using the electric motor to a higher seat position that is higher than a previous seat position existing immediately prior to the seat raising command, the raising of the bicycle seat occurring only after the releasing of the operating device such that the bicycle seat remains stationary until the operating device is released.

Abstract: An apparatus including an upper post, a main post, a control tube, a tension spring, and a hydraulic reset. The upper post can include a compression spring. The main post can be configured to telescopically mate with the upper post. The control tube can be rotably coupled to the main post. The tension spring can be configured to pull the upper post to the main post. The hydraulic reset can be configured to compress the compression spring. The upper post and the control tube can be configured to selectively lock the upper post to the control tube at at least two positions. In a first position of the control tube, the control tube can be configured to engage the compression spring. In a second position of the control tube, the control tube can be configured to disengage the compression spring.

Abstract: A vehicle includes a seating platform featuring a first pair of seat mounting holes, a second pair of seat mounting holes positioned rearward of the first pair of seat mounting holes and a third pair of seat mounting holes positioned rearward of the second pair of seat mounting holes. A seatback is provided with a pair of hooks and a pair of snaps. Each of the snaps includes a catch portion. The hooks and snaps are adapted to engage the first and second pair of seat mounting holes to secure the seatback in a first position. The hooks and snaps are also adapted to engage the second and third pair of seat mounting holes to secure the seatback in a second position.

Abstract: A bicycle seat clamp assembly includes a body having opposing side faces with an arched first and second lower guide rail outwardly project therefrom, respectively. A first wing clamp is positioned on the first lower guide rail while a second wing clamp is positioned on the second lower guide rail. A primary fastener attaches the first wing clamp and the second wing clamp to the body, the primary fastener being movable between a first position wherein the first wing clamp and the second wing clamp are rigidly fixed to the body and a second position wherein the first wing clamp and the second wing clamp can freely slide along the first lower guide rail and the second lower guide rail, respectively. Structure is also provided for releasably securing a bicycle seat to the first wing clamp and the second wing clamp independent of movement of the primary fastener.

Abstract: A method and apparatus for a seat post assembly that is adjustable to an upper, intermediate, and lower seat post position using a locking member and a sleeve member coupled to an actuator for securing and releasing an inner tube with respect to an outer tube. The actuator may move the sleeve member to release the locking member from engagement with the outer tube to adjust the inner tube and thus the seat post assembly to the upper, intermediate, or lower seat post positions. The actuator and the sleeve may be biased into an initial position that urges the locking member into engagement with outer tube to lock the inner tube to the outer tube.

Abstract: A saddle support includes a pipe and a fixing clamp with a tightening lower plate and a tightening upper plate mounted at one upper end of the pipe and able to solidly tighten one or more support elements for supporting the saddle.

Abstract: An ergonomic saddle structure for bicycles and pedal machines comprises a shell (2) made of relatively rigid material, a pronged connection (15) anchorable on the lower part to the shell (2) and having a central body (16) with a slotted through hole (23) provided with flared or smoothed longitudinal edges (23?), connection means which comprise a fork (24) with a pair of lateral wings (25, 26) adapted to house the central body (16) and provided with respective cylindrical through openings (27, 28) as well as locking means for locking the fork (24) with respect to the pronged connection (15), which means comprise a first pair of inserts (30, 31) insertable in one portion of the through openings (27, 28), a second pair of inserts (39, 40) insertable in the remaining portion of the circular through openings (27, 28), are first screw means (37) operating on the first pair of inserts (30, 31) and second screw means (43) operating on the second pair of inserts (39, 40) in order to longitudinally and angularly lock t

Abstract: An ergonomic saddle structure for bicycles and pedal machines, includes a shell made of relatively rigid material, and a connection member anchoring the shell to a frame of a bicycle or a pedal machine. The shell has a rear portion of enlarged plan shape and, a front portion with at least partially tapered plan shape, and an intermediate connection portion. The rear portion has uniformly joined lateral edges of a substantially convex shape. The intermediate portion has lateral edges of concave plan form and bend radius about equal to the average bend radius of the lateral edges of the convex rear portion (3), and a minimum width just greater than the maximum width of the connection member, so to define, at the user's thighs, a narrow zone adapted to reduce compression and rubbing of the inner surface of the thighs with the lateral edges of the shell.

Abstract: A seat attachment device is provided that uses a single bolt to secure the seat rails to the seat attachment device and the seat attachment device to a post.

Abstract: An angle adjuster for a bicycle seat that is disposed between a frame of a vehicle and a seat. The angle adjuster for a bicycle seat includes: a frame connector configured to be connected with the frame; a seat connector configured to support the seat, rotatably connected to the upper end of the frame connector, and having a nose at bottom facing the frame connector; an angle adjusting assembly disposed between the frame connector and the seat connector, and having a plurality of locking steps where the nose is configured to be selectively engaged to control rotational angle of the seat connector; an operating lever configured to be mounted on the frame to operate the angle adjusting assembly; and a wire connecting the angle adjusting assembly with the operating lever and reciprocating the angle adjusting assembly, when the operating lever is operated.

Abstract: There is provided an adjustable saddle support that adjustably connects a conventional bicycle saddle with a conventional bicycle seat post. The conventional bicycle seat post has a conventional first saddle clamp mechanism. The adjustable saddle support comprises an adjustment mechanism that has a second saddle clamp mechanism and a support member which supports the adjustment mechanism. The adjustment mechanism adjustably engages the support member. There is also a pair of rails which have parallel spaced apart sections. The pair of rails is connected with the support member.

Abstract: A bicycle seat assembly for use in conjunction with a bicycle having a frame, a front and rear wheel, and a seat post extending generally vertically upwardly in the frame between the front and rear wheel. The bicycle seat assembly includes a seat having at least one elongated strut extending between the seat and the bicycle frame around the rear wheel axis of the vehicle. A second elongated strut extends between the seat post and the seat so that the seat is positioned generally vertically above the rear wheel axle.

Abstract: The fastening device of the present invention includes a base, two pawl shanks and two positioning rods. The base is formed with two hook portions and two base positioning holes. Each pawl shank is formed with a pawl positioning hole, and each pawl shank includes a pawl section and a hook section. Each positioning rod inserts in one of the base positioning holes and the pawl positioning hole of one of the pawl shanks, such that the pawl shanks are pivotable about the positioning rods respectively. Each hook portion and its corresponding hook section define a tube clamp space, and the pawl sections define a pad clamp space. The fastening device further includes a means for narrowing the tube clamp spaces and the pad clamp space.

Abstract: An apparatus for fitting a bicycle saddle comprises a mounting rod secured to a bicycle frame, a height adjuster mounted upon the mounting rod, a lateral adjuster mounted upon the height adjuster, a tilt orientation adjuster mounted upon the lateral adjuster, and a clamp securing the saddle to the tilt orientation adjuster.

Abstract: A saddle-positioning apparatus includes a first positioning unit for positioning a saddle in a first dimension, a second positioning unit for positioning the saddle in a second dimension, and a lever connected to both of the first and second positioning units. The lever is movable from a neutral position in a direction to move the first positioning unit from a locking position to a releasing position to allow movement of the saddle in the first dimension. The lever is movable from the neutral position in an opposite direction to move the second positioning unit from a locking position to a releasing position to allow movement of the saddle in the second dimension.

Abstract: An ergonomic saddle structure for bicycles and pedal machines comprises a shell (2) made of relatively rigid material, a pronged connection (15) anchorable on the lower part to the shell (2) and having a central body (16) with a slotted through hole (23) provided with flared or smoothed longitudinal edges (23?), connection means which comprise a fork (24) with a pair of lateral wings (25, 26) adapted to house the central body (16) and provided with respective cylindrical through openings (27, 28) as well as locking means for locking the fork (24) with respect to the pronged connection (15), which means comprise a first pair of inserts (30, 31) insertable in one portion of the through openings (27, 28), a second pair of inserts (39, 40) insertable in the remaining portion of the circular through openings (27, 28), are first screw means (37) operating on the first pair of inserts (30, 31) and second screw means (43) operating on the second pair of inserts (39, 40) in order to longitudinally and angularly lock t

Abstract: A bicycle seat comprised of a seat body having a sitting surface and a nose, a base, means for attaching the base to a seat post, and means for attaching the seat body to the base such that the seat body is free to move along the longitudinal axis of the base when a locking mechanism is unlocked. In one embodiment, the unlocking is accomplished by lifting the nose of the seat body away from the base, thus providing the capability of dynamic adjustment of longitudinal or fore-aft seat position while riding. In an alternative embodiment, a bolt protruding from the seat body is retracted to disengage the locking mechanism and allow dynamic adjustment of longitudinal seat position without lifting the nose. A vertical adjustment corresponding to the longitudinal position of the seat is taught to maintain, if desired, the same distance between bike seat and peddles for any longitudinal position of the seat.

Abstract: A bicycle passenger seat may include a mounting bracket adapted to be attached to an existing pole of an operator seat pole of an existing bicycle. A support frame may be pivotally attached to the mounting bracket and adapted to be selectively coupled to an axle of the rear wheel of the existing bicycle. A stud bolt is removably connected to the support frame. Passenger handles are removably attached to axially opposed ends of the stud bolt. A passenger seat may further be coupled to a posterior end of the support frame. The horizontal length of the support frame may be selectively adjustable along an x-axis while the vertical length may be selectively adjustable along a y-axis. In this manner, the combined weight of the operator and passenger is more evenly distributed so that a center of mass is forwardly spaced from the rear wheel of the bicycle.

Abstract: A positioning device includes a mount secured on a seat tube, and left and right joint members having joint surfaces which abut against the mount, and gripping cavities which mate with clamping cavities of left and right clamping members to permit lengthwise segments of left and right anchoring bars of a seat to be clamped in left and right bar-engaging zones, respectively. When the joint surfaces switch places or when the left and right clamping members are shifted, the bar-engaging zones are displaced from a first position to be proximate to corresponding ones of front and rear ends of the anchoring bars, to a second position to be proximate to the other corresponding ones of the front and rear ends of the anchoring bars, thereby enabling the seat to be adjusted to a desired position relative to the seat tube.

Abstract: A tool-less coupling of a child vehicle having a front frame and a rear frame includes a post coupled to one of the front or rear frames; a locking insert having at least one flexible table coupled to the post, and a head tube coupled to the other of the front or rear frame, wherein an opening in a first end of the head tube is sized to cause inward flexing of the flexible tab as the post is inserted through the head tube, and the flexible tab flexes back outwardly after passing through the opening in the head tube so that a portion of the flexible tab is adjacent an end surface of the head tube such that the flexible tab cannot move back through the opening. Accordingly, the removal of the post from the head tube is prohibited and the front and rear frames are coupled together. A method for a tool-less assembly of a child vehicle is also disclosed.

Abstract: A saddle mounting device includes a support member having a mounting portion formed thereon. A lower base is connected with the support member. The lower base has two guiding flanges diametrically formed thereon. Two gaps are respectively defined between the two guiding flanges. The lower base has two first engaging grooves defined therein. An upper base is movably connected with the lower base. The upper base has two sliding rods formed thereon for sliding along the two guiding flanges and are guided into the two gaps. The upper base has two second engaging grooves defined therein for corresponding to the two first engaging grooves. A fastener connects the support member with the lower base and is screwed with the upper base. The upper base is simultaneously moved relative to the lower base by a rotation of the fastener.

Abstract: A saddle-positioning apparatus includes a first positioning unit for positioning a saddle in a first dimension, a second positioning unit for positioning the saddle in a second dimension, and a lever connected to both of the first and second positioning units. The lever is movable from a neutral position in a direction to move the first positioning unit from a locking position to a releasing position to allow movement of the saddle in the first dimension. The lever is movable from the neutral position in an opposite direction to move the second positioning unit from a locking position to a releasing position to allow movement of the saddle in the second dimension.

Abstract: An adjusting structure for a seat tube of a bicycle includes a seat tube, two engaging blocks, two cover members, and a locking unit, wherein two engaging blocks are symmetrically provided on two sides of a positioning seat of the seat tube, and the engaging blocks engages with each other by using the positioning seat, the two cover members are symmetrically fixed on outer sides of the two engaging blocks, and a locking unit laterally passes through the above-mentioned components and allows to be alternatively rotated tightly or loosely, thereby adjusting a saddle to become inclined and to move forward and backward easily.

Abstract: An apparatus for fitting a bicycle saddle comprises a mounting rod secured to a bicycle frame, a height adjuster mounted upon the mounting rod, a lateral adjuster mounted upon the height adjuster, a tilt orientation adjuster mounted upon the lateral adjuster, and a clamp securing the saddle to the tilt orientation adjuster.

Abstract: Described are several mechanisms for permitting a user to adjust the seat on a stationary exercise bicycle. The described mechanisms can be used to adjust the height of the seat or the fore and aft positioning of the seat on an upright type bicycle. Each of the described mechanisms can be configured to provide users with an optimum seat position and with a convenient latch mechanism to adjust the position of the seat.

Abstract: A holding assembly for a seat of a bicycle has a securing base and an engaging block. The securing base has a connecting segment, an engaging segment, a securing hole and a securing bolt. The connecting segment has a connecting device connected with the seat of the bicycle. The engaging segment is formed on and protrudes from the bottom of the connecting segment and has an engaging recess having an inclined top surface. The securing bolt is slidably and rotatably mounted in the securing hole, extends into the engaging recess and has a threaded portion. The engaging block is moveably mounted in the engaging recess and has an inclined top surface abutting with the inclined top surface of the engaging recess and a threaded portion engaging the threaded portion on the securing bolt.

Abstract: A vehicle seat is slidably mounts to rails secured to a vehicle chassis. The rails extend downwardly and away from the steering shaft of the vehicle at a substantial slope. Grooves formed in the rails receive posts secured to the seat to slidably mount the seat. A plurality of registration surfaces, such as a row of apertures, are secured to the rails and engage one or more locking pins. The locking pins are actuated by cables extending to a lever positioned near the edge of the seat. Springs urge the locking pins into engagement with the registration surfaces when tension is not applied to the cables. In an alternative embodiment, an air spring mounts between the seat and vehicle chassis. The amount of air within the air spring controls the position of the seat along the rails.

Abstract: Described are several mechanisms for permitting a user to adjust the seat on a stationary exercise bicycle. The described mechanisms can be used to adjust the height of the seat or the fore and aft positioning of the seat on an upright type bicycle. Each of the described mechanisms can be configured to provide users with an optimum seat position and with a convenient latch mechanism to adjust the position of the seat. Also described is a seat mechanism for use with a recumbent type stationary exercise bicycle where the seat can be adjusted along the longitudinal length of the bicycle.

Abstract: An adjustment device for bicycle seat includes a connection portion located close to a top of the seat post and at least one through hole is defined through a wall of the connection portion. An adjustment device is located between the seat connector and the seat post so as to adjust the seat post relative to the seat tube. The adjustment device includes an adjustment path which can communicate with the at least one through hole or be sealed from the at least one through hole. A balance unit is connected to the connection portion and includes a cylinder and a piston ring is movably received in the cylinder to define an inner space of the cylinder into a liquid space and an air space. The cylinder includes a supply path which communicates with the liquid space and the at least one through hole.

Abstract: A seat attachment device is provided that uses a single bolt to secure the seat rails to the seat attachment device and the seat attachment device to a post.

Abstract: The present invention finds application in the field of support structures, and particularly relates to a seat structure, particularly for cycle and human body support frames. The structure comprises a support element (2) having a lower surface (4) and an upper surface (3), the latter being designed to support at least partially the weight of a user, and anchor means (5) associated to the support element (2) for anchorage thereof to a bicycle or human body support frame (T) in a longitudinally and/or angularly and/or vertically adjustable position. The anchor means (5) include at least one longitudinal extension (6), which extends downwards from said support element (2) and has at least one substantially horizontal member (7), designed to be clamped by at least one substantially horizontal clamping member (S), which is associated to the frame (T), and acts in a substantially vertical direction.

Abstract: One embodiment of the present invention discloses a cardio-fitness equipment with a seat that features height adjustment, proximity to handlebars adjustment, and easy removal of the seat for the purpose of exchange with a different user-selected model or for cleaning.

Abstract: A seat attachment device is provided that uses a single bolt to secure the seat rails to the seat attachment device and the seat attachment device to a post.

Abstract: A saddle-adjusting mechanism of a fitness apparatus having: a) a set of upper and lower parallel slide rails pivotally attached to a front and a rear connecting rod; and b) a saddle support with guide rollers and an engaging gear such that the upper and lower parallel slide rails may be adjusted at a certain angle. Meanwhile, a saddle can be moved forward and backward and maintained at a certain angle so that the operators have a comfortable sitting. Moreover, a back pad support is installed in such a way that a fine adjustment of the backing angle of a back pad is achieved by moving it upward and downward.

Abstract: A seat attachment device is provided that uses a single bolt to secure the seat rails to the seat attachment device and the seat attachment device to a post.

Abstract: A positioning device includes a mount secured on a seat tube, and left and right joint members having joint surfaces which abut against the mount, and gripping cavities which mate with clamping cavities of left and right clamping members to permit lengthwise segments of left and right anchoring bars of a seat to be clamped in left and right bar-engaging zones, respectively. When the joint surfaces switch places or when the left and right clamping members are shifted, the bar-engaging zones are displaced from a first position to be proximate to corresponding ones of front and rear ends of the anchoring bars, to a second position to be proximate to the other corresponding ones of the front and rear ends of the anchoring bars, thereby enabling the seat to be adjusted to a desired position relative to the seat tube.