Abstract: An exemplary embodiment sets forth an apparatus, including a non-collapsible single unit stair comprising: a pair of opposing side rails supporting at least a top step and a bottom step; a coupler adapted to couple the apparatus to an edge of a horizontal surface; and a height adjustable user-support arm, coupled to one of the side rails with a rotatable coupling, wherein the user-support arm is moveable between a support position and a storage position.

Abstract: An apparatus comprises in combination, an engine compartment having an engine with related engine components, and a step or series of steps. The step is securely mounted in a manner for supporting the weight of a person. The step is adapted with a non-slip upwardly facing surface for standing on is positioned for enablement of proximity positioning of a person for applying maintenance to the engine and related engine components.

Abstract: An integrally molded, one-piece running board (10) is adapted for attachment to a motor vehicle (14). The running board (10) includes a stepping platform (16) having an upper surface (18) and a lower surface (20) extending along a longitudinal axis and laterally between outer and inner edges. A plurality of mounting projections (32) is molded with and extend laterally from the inner edge. The plurality of mounting projections (32) is securable to the motor vehicle for holding the stepping platform (16) thereagainst. A plurality of reinforcing ribs (52) extends between the lower surface (20) of the stepping platform (16) and the plurality of mounting projections (32) to support the running board as a downward force is applied to the upper surface of the stepping platform (16).

Abstract: A hitch-mounted step for a vehicle that extends beyond a deployed fold-down tailgate of a vehicle and allows people and pets to more easily enter and exit the rear cargo area of a vehicle. The hitch-mounted step is easily stored and deployed without the need to remove the step from the receiver hitch.

Abstract: A vehicle step tube comprising a one-piece elongated extrusion having a plurality of vertical ribs extending from the upper surface. The ribs are relatively short in a step portion of the extrusion to form a step platform. The ribs are relatively tall in the non-step portions flanking the step portion. The ribs define transverse recesses in the step portion to enhance traction and aesthetics.

Abstract: A running board is provided by the invention. The running board includes a deck and a plurality of attachment members. The deck and the plurality of attachment members are formed from a continuous polymer composition. The deck has a stepping surface and a support structure for supporting the stepping surface. The plurality of attachment members extend from the support structure and each attachment member has at least one opening for receipt of a fastener. The plurality of attachment members are provided for attachment to at least one of a motor vehicle frame and a motor vehicle rocker panel. A motor vehicle and methods for manufacturing and installing a running board are provided.

Abstract: A heel rest for a motorcycle having an exhaust pipe. The heel rest including a mounting base adapted to connect to the exhaust pipe and a heel pad coupled to the mounting base. The heel rest also includes an insulating member disposed between the heel pad and the mounting base to inhibit heat transfer between the heel pad and the mounting base.

Abstract: A powered running board assembly has a deck and at least two hinges extending from the deck for mounting longitudinally the deck to an underside of a vehicle. Each hinge has a mounting bracket configured to mount to the underside of the vehicle. A pair of links pivotally extends between the deck and mounting bracket. The deck is movable between a retracted position and an extended position. A motor assembly operably engages at least one of the hinges to drive the deck between the retracted and extended positions. The motor assembly extends substantially longitudinally. The motor assembly has a gear train and clutch assembly enabling the motor assembly to drive relative to the deck movement when the deck movement is prevented, and enabling manual deck movement when the motor assembly is not energized.

Abstract: A retractable step system for providing access to and from an elevated platform of a vehicle. The retractable step system is configured to move between a use position and a stowed position. The retractable step system comprises a pair of longitudinal rails which are extended when the system is in the use position and collapsed when the system is in the stowed position. The system further comprises an auxiliary platform assembly rotatably coupled near the platform, and a step structure coupled to the longitudinal rails for providing a user with an intermediate surface upon which to step.

Abstract: A stand for lifting the rear end of a motorcycle that comprises a supporting base, rolling wheels, and a leverage arm. The stand is placed under the motorcycle in front of the rear wheel and engages the swingarm near the rear axle. Operation is accomplished by pushing the leverage arm forward and downward to the ground. An adjustable bracket allows for adjustment of the stand for motorcycles of various heights or for lifting the same motorcycle to different heights as desired.

Abstract: A running board for an all-terrain vehicle includes structure for substantially blocking snow, mud and the like from landing onto the running board during operation, and also for blocking engine heat from excessively warming the feet of a rider. In a running board including a step portion which is positioned on a side of a powertrain unit having an operation pedal in a side portion thereof, a partition is provided between the engine and the step portion, the partition including an insertion opening portion into which the operation pedal is inserted. The partition can be made wider since the operation pedal is inserted into the insertion opening portion blocking snow, mud and the like from coming through a space between the running board and the engine. The partition plate also tends to block engine heat from excessively warming the feet of a rider.

Abstract: A mounting system is provided for securing a metal support surface to a metal bracket on a railroad car. The invention is improved by a compressible, energy absorbing arrangement secured intermediate the support surface and the bracket for preventing metal to metal contact between the support surface and the bracket and absorbing vibrational energy caused by movement of the railroad car.

Abstract: A running board for a vehicle such as a truck is mounted to the vehicle body using a C-shaped mounting bracket. The bracket has an open clearance area to accommodate air conditioning conduits or other similar structure adjacent the vehicle body. The running board may include pivotable end caps which may be pivoted to lie parallel with the support surface of the running board and overlying front or rear vehicle fenders. Mounting bolts for the end cap may pass through the running board body of the vehicle fender and the vehicle body.

Abstract: A control mechanism for a powered running board on an automotive vehicle, such as a sport utility vehicle, utilizes the memory function of the vehicle to store therein established operating positions for the running board. The user or occupant of the vehicle can manually position the powered running board to a convenient operating position within a range of available operating positions on the vehicle. By storing the selected position of the running board in the memory function of the vehicle, the control mechanism can return to that same operating height each time the occupant seeks to use the running board for entry or exit of the vehicle. The control mechanism is operable with different configurations of running boards and with different power devices for effecting the movement of the running board.

Abstract: An apparatus and method that attaches to a tire and supplies a step to enable access to the engine compartment or rooftop of a vehicle is provided. The apparatus is adjustable to better fit with a variety of different sized tires. The apparatus is also adjustable to allow the apparatus to rest at different height locations on the tire. Additionally, the tire step can be folded for easier storage.

Abstract: A retractable step for use with a vehicle comprises a stepping member having a stepping deck, a first arm, a second arm, a motor and a stop. The first arm has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The second arm also has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The motor is drivingly connected to the first arm such that a rotation of the motor causes rotation of the first arm about its first end and moves the stepping member from a retracted position to an extended position, or vice versa. The stop is located within the range of motion of the second arm such that the second arm bears against the stop when the stepping member is in the extended position. The first and second arms are situated such that the first arm is loaded in compression and the second arm is loaded in tension when the stepping member is in the extended position and a load is placed upon it.

Abstract: The present invention is directed to a heated anti-slip step for a motor vehicle. The step includes a metal tread plate having a plurality of grip structures extending upwardly from a top surface of the tread plate. A plurality of drain holes extend through the tread plate. An electrical resistance heater is disposed proximate to the tread plate and is operable to heat the step so as to melt any snow or ice that may be present on the step.

Abstract: A stowable platform for use with a vehicle movable from the stowed to the extended position in a single plane. Once extended, the platform support is locked, preventing further movement, and the platform itself is capable of further extension or elevation.

Abstract: A running board assembly accommodates access to a motor vehicle. The running board assembly includes a plurality of mounting brackets fixedly secured to the motor vehicle and extending therebelow. The running board assembly also includes a step movably secured to the plurality of brackets. The step defines a stepping surface and a peripheral edge extending around a portion of the stepping surface. The step is movable between a deployed position providing access to the stepping surface and a stowed position wherein the peripheral edge abuts the motor vehicle to cover the stepping surface during non-use.

Abstract: A retractable step for use with a vehicle comprises a stepping member having a stepping deck, a first arm, a second arm, a motor and a stop. The first arm has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The second arm also has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The motor is drivingly connected to the first arm such that a rotation of the motor causes rotation of the first arm about its first end and moves the stepping member from a retracted position to an extended position, or vice versa. The stop is located within the range of motion of the second arm such that the second arm bears against the stop when the stepping member is in the extended position. The first and second arms are situated such that the first arm is loaded in compression and the second arm is loaded in tension when the stepping member is in the extended position and a load is placed upon it.

Abstract: A polymeric running board for an automotive vehicle is provided. The running board has a polymeric platform for supporting a vehicle occupant's foot during entry or exit of a lateral side door of the vehicle. The platform is connected to the vehicle by J-shaped support brackets which are co-molded therewith. The running board provided is advantageous over prior running boards in that it is lighter and easier to assemble, reducing assembly time and cost.

Abstract: A molded running board provided with a support portion and a top portion is described herein. The support portion is made of plastic material and provided with reinforcing ribs and the top portion is made of a plastic material that is advantageously compatible with the plastic material forming the support portion. A method for the assembly of such a molded running board is also described herein. This method includes the welding of a top portion to a support portion via the use of a thin strand of plastic material compatible with material used in the top portion and the support portion and metallic particles in an electromagnetic press, for example.

Abstract: Improved selectively rotatable multipositionable step attachment for a vehicle platform and the like for not only facilitating safe user access to the platform, for loading and unloading same, when the step attachment is in an operative position, but also when it is in a non operative or stowage position for facilitating additional use of the platform such as for towing another platform or for facilitating attachment of an auxiliary platform to the vehicle platform. The step attachment is generally made up of a support bar, a rotatable step tread of L-shaped configuration, a multiappatured index plate concentrically affixed to the outer end of either the support bar or the rotatable step tread, and a device to fasten the step assembly to the vehicle platform. Depending on the various requirements of the step attachment when being connected to a vehicle platform and the like, various mounting arrangements are provided.

Abstract: An access system for a terminal or a yard type motor truck tractor includes three vertically and laterally spaced steps which are mountable on the tractor frame just aft of the tractor cab to provide access between ground level and a deck or platform of the tractor aft of the cab. First and second vertical and laterally spaced steps are mounted on a member supported by one of the tractor frame rails. A third step is separately mounted on the frame rail interposed the second step and the platform and includes handrails disposed adjacent thereto. The access system provides improved access between the tractor rear deck or platform and ground level and reduces user fatigue. A member supporting the first and second steps may form a storage compartment.

Abstract: A running board support assembly (200) for fastening a running board step (104) to a vehicle includes a support bracket (204) for engagement with the running board step, and a mounting bracket (202) for coupling the support bracket (204) to the vehicle. The mounting bracket (202) includes a hooking end (212) and a pin (214). The support bracket (204) includes a hook (226) for engagement with the hooking end (212), and an aperture (218) for engagement with the pin (214). When assembled, the hook (226) and the aperture (218) cooperate to tension the mounting bracket (202) and thereby secure the support bracket (204) to the mounting bracket (202).

Abstract: A step apparatus (10) is provided for use on a vehicle tire and includes a first step assembly (12) which includes a first step portion and a pair of first struts extending upward from the first step portion. A second step assembly (18) includes a second step portion and a pair of end bracket members extending downward from the second step assembly. Each of the end bracket members includes a front bracket portion and a rear bracket portion. Hinge members (28) are connected between the first struts and the front bracket portions. A pair of pawl assemblies (30) are connected to the rear bracket portion. When the tire step apparatus is installed on a tire, a person can step up on the first step portion and the second step portion. Each of the first struts includes a stop member for contacting the tire when the apparatus is installed on the tire. Each of the pawl assemblies includes a pawl hinge connected to one of the rear bracket portions. A pawl plate is connected to the pawl hinge.

Abstract: A retractable running board assembly is mounted to the frame of a vehicle. The running board is selectively extendable between a retracted position, which is close to the vehicle's frame, and a lower, laterally-outward extended position that facilitates easy entrance into and exit from the vehicle. A plurality of longitudinally spaced, selectively-actuated links connect the running board to the frame. A selectively-operable driving mechanism concertedly actuates each of the links to extend and retract the running board. When the driving mechanism is not operated, each link resists actuation and holds the running board in a fixed position relative to the frame.

Abstract: A retractable step for use with a vehicle comprises a stepping member having a stepping deck, a first arm, a second arm, a motor and a stop. The first arm has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The second arm also has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The motor is drivingly connected to the first arm such that a rotation of the motor causes rotation of the first arm about its first end and moves the stepping member from a retracted position to an extended position, or vice versa. The stop is located within the range of motion of the second arm such that the second arm bears against the stop when the stepping member is in the extended position. The first and second arms are situated such that the first arm is loaded in compression and the second arm is loaded in tension when the stepping member is in the extended position and a load is placed upon it.

Abstract: A retractable step for use with a vehicle comprises a stepping member having a stepping deck, a first arm, a second arm, a motor and a stop. The first arm has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The second arm also has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The motor is drivingly connected to the first arm such that a rotation of the motor causes rotation of the first arm about its first end and moves the stepping member from a retracted position to an extended position, or vice versa. The stop is located within the range of motion of the second arm such that the second arm bears against the stop when the stepping member is in the extended position. The first and second arms are situated such that the first arm is loaded in compression and the second arm is loaded in tension when the stepping member is in the extended position and a load is placed upon it.

Abstract: A running board assembly for a motor vehicle has a step for supporting an individual thereon. The running board assembly also includes a slide assembly extending between the step and the motor vehicle for slidably moving the step between a retracted position and an extended position. In addition, the running board assembly includes a pneumatic cylinder operatively engaging the slide assembly so that the pneumatic cylinder effects energizing movement between the retracted and the extended positions.

Abstract: A hitch illumination apparatus comprising a hitch body assembly, a hitch attachment assembly and a hitch illumination assembly. The hitch body assembly includes a base member and at least one arm member. The base member includes a first end and a second end. The at least one arm member includes a proximal end and a distal end. The proximal end is positioned proximate the first end of the base member. The at least one arm member is pivotable relative to the base member. The hitch attachment assembly includes a hitch attachment member and a hitch body attachment member. The hitch attachment member is capable of attachment to an existing hitch. The hitch body attachment member is capable of attachment proximate the second end of the base member. The hitch illumination assembly includes at least one lamp associated with the second end of the base member. The hitch illumination assembly includes at least one clamp that is associated with the second end of the at least one arm member.

Abstract: An apparatus for assisting entry into high road clearance vehicles having a generally cylindrical side bar adapted for attachment to a vehicle chassis, one or more U-shaped cylindrical bars attached to and suspended from said bar comprised of two end portions and a center bar, a generally flat surface on the top of each of said center bar of said U-shaped bars. The U-shaped bars maybe of tubular construction and have a flat surface and are preferably angled from the side bar at an angle of approximately 45 degrees and each U-shaped bar has end portions that meet the center bar at an angle of approximately 0 to 45 degrees. The side bar may be attached to any of a variety of chassis designs and may have a plurality of steps at the doors and at or near the back of the vehicle.

Abstract: A step configured to be attached to the drawbar of a trailer hitch. The step incorporates a hole and a ball mount receiver. The ball mount receiver is placed over the ball mount on the hitch. The hole allows the hitch ball and its accompanying lock washer and nut to be used to simultaneously mount the step and the hitch ball. The step is shaped to allow free access to the hitch ball so that a trailer can be attached while the step remains in place. The step then allows a user to step up and over the hitch with attached trailer.

Abstract: A retractable step for use with a vehicle comprises a stepping member having a stepping deck, a first arm, a second arm, a motor and a stop. The first arm has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The second arm also has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The motor is drivingly connected to the first arm such that a rotation of the motor causes rotation of the first arm about its first end and moves the stepping member from a retracted position to an extended position, or vice versa. The stop is located within the range of motion of the second arm such that the second arm bears against the stop when the stepping member is in the extended position. The first and second arms are situated such that the first arm is loaded in compression and the second arm is loaded in tension when the stepping member is in the extended position and a load is placed upon it.

Abstract: A method of attaching a vehicle accessory such as a running board, to a vehicle for assisting in entry and exit from the vehicle as well as protecting the body of the vehicle is disclosed, comprising an accessory such as molded running board and/or substructure with a plurality of receiving zones for receiving the mounting arm brackets, and further comprising a means of securing the accessory to the bracket by means of deflectable locking tab and aperture configuration. The securing means of the present invention requires no additional hardware for its attachment, thereby simplifying the mounting procedure, reducing manufacturing costs, while providing a strong, secure mount.

Abstract: A step assembly generally includes a step and a mounting member for attaching the step to a trailer hitch mounted to a vehicle. The step is pivotally attached to the mounting member and rotates relative to the mounting member from a generally horizontal position to a generally vertical position. The step includes a stepping member upon which a user steps to gain access to the cargo area of a vehicle. When the step is in the generally vertical position, the stepping member is positioned higher than the bumper of the vehicle.

Abstract: A retractable step for use with a vehicle comprises a stepping member having a stepping deck, a first arm, a second arm, a motor and a stop. The first arm has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The second arm also has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The motor is drivingly connected to the first arm such that a rotation of the motor causes rotation of the first arm about its first end and moves the stepping member from a retracted position to an extended position, or vice versa. The stop is located within the range of motion of the second arm such that the second arm bears against the stop when the stepping member is in the extended position. The first and second arms are situated such that the first arm is loaded in compression and the second arm is loaded in tension when the stepping member is in the extended position and a load is placed upon it.

Abstract: An integrally molded, one-piece running board (10) is adapted for attachment to a motor vehicle (14). The running board (10) includes a stepping platform (16) having an upper surface (18) and a lower surface (20) extending along a longitudinal axis and laterally between outer and inner edges. A plurality of mounting projections (32) is molded with and extend laterally from the inner edge. The plurality of mounting projections (32) is securable to the motor vehicle for holding the stepping platform (16) thereagainst. A plurality of reinforcing ribs (52) extends between the lower surface (20) of the stepping platform (16) and the plurality of mounting projections (32) to support the running board as a downward force is applied to the upper surface of the stepping platform (16).

Abstract: A folding step assembly for the tailgate of a truck that provides two steps projecting rearwardly and downward and has grab handles for safe and convenient access into the bed of a truck. The step assembly is completely supported by the tailgate and does not touch the ground. It attaches to the inside panel of the tailgate and is completely concealed below the top edge of the tailgate when in the stowed position. The step assembly attaches to the tailgate by means of a Z shaped mounting bracket and lock bracket. The step assembly is locked onto the lock bracket with a lock and key and is easily removable from the tailgate when the user desires.

Abstract: A running board for an all-terrain vehicle includes structure for substantially blocking snow, mud and the like from landing onto the running board during operation, and also for blocking engine heat from excessively warming the feet of a rider. In a running board including a step portion which is positioned on a side of a powertrain unit having an operation pedal in a side portion thereof, a partition is provided between the engine and the step portion, the partition including an insertion opening portion into which the operation pedal is inserted. The partition can be made wider since the operation pedal is inserted into the insertion opening portion blocking snow, mud and the like from coming through a space between the running board and the engine. The partition plate also tends to block engine heat from excessively warming the feet of a rider.

Abstract: An access system, particularly adapted for a terminal or a yard type motor truck tractor, includes three vertically and laterally spaced steps which are mountable on the tractor frame just aft of the tractor cab to provide access between ground level and a deck or platform of the tractor aft of the cab. First and second vertical and laterally spaced steps are mounted on a member supported by one of the tractor frame rails. A third step is separately mounted on the frame rail interposed the second step and the platform and includes handrails disposed adjacent thereto. The access system provides improved access between the tractor rear deck or platform and ground level and reduces user fatigue. A member supporting the first and second steps may form a storage compartment.

Abstract: A running board for a vehicle such as a truck is mounted to the vehicle body using a C-shaped mounting bracket. The bracket has an open clearance area to accommodate air conditioning conduits or other similar structure adjacent the vehicle body. The running board may include pivotable end caps which may be pivoted to lie parallel with the support surface of the running board and overlying front or rear vehicle fenders. Mounting bolts for the end cap may pass through the running board body of the vehicle fender and the vehicle body.

Abstract: A vehicle mounted step assembly for use with trailer hitch. The vehicle mounted step assembly includes a platform portion and a tongue portion. The platform portion is pivotable with respect to the tongue portion between a lowered use position and a raised storage position. The platform portion is also slidable with respect to the tongue portion from a first configuration to a second configuration.

Abstract: A step configured to be attached to the drawbar of a prior art trailer hitch. The step incorporates a hole and a ball mount receiver. The ball mount receiver is placed over the ball mount on the prior art hitch. The hole allows the hitch ball and its accompanying lock washer and nut to be used to simultaneously mount the step and the hitch ball. The step is shaped to allow free access to the hitch ball so that a trailer can be attached while the step remains in place. The step then allows a user to step up and over the hitch with attached trailer.

Abstract: A vehicle running board assembly comprises a pipe adapted to be connected to a motor vehicle, the pipe having an interior surface and first and second side edges defining an opening, a step pad having a contact surface contacting the first and second side edges, and a clip connected to the step pad, extending into the opening and resiliently engaging the pipe so as to resist separation of the clip and step pad from the pipe. A load is defined by the weight of the step pad and any other object on the step pad. The step pad contact surface directly contacts the first and second side edges of the pipe so that the side edges act as primary bearing surfaces for the load. The clip may have a series of retaining ribs where each of the retaining ribs are resiliently flexible around a single axis and engage the interior surface of the pipe below the single axis.

Abstract: A step for mounting in a trailer hitch which is adjustable in the vertical and horizontal positions. A joining member has displaced connecting ends sized to fit both a standard trailer hitch and a mounting bracket on the step. One or more fastening points in at least one of the connecting ends of the joining-member enables adjustment of the position of the joining member to the trailer hitch. Rotation and reversal of the joining member provides for a variety of adjustments in the vertical and horizontal position of the step with relation to the trailer.

Abstract: The present invention comprises a footrest with a poking rod; a bumper with an embedding hole is formed on the footrest; a latch member having two bent latch plates, each latch plate having a latch groove with a corresponding concave neck disposed inwardly, and a corresponding concave latch fork inwardly disposed, a latch wing outwardly disposed is formed on the latch groove; a corresponding outwardly protruded extension section is defined under the latch groove; such that the poking rod is clipped by the two plates of the latch member, and engaged by the latch fork. The footrest with the latch member and the poking rod are fully embedded and inserted into the embedding hole on the base of the bumper and secured into a fixed position.

Abstract: The present invention discloses a service platform apparatus 10 for mounting to a front of a vehicle 12 for supporting a user 14 or other objects. The service platform apparatus 10 includes a generally planar platform 18 having a support surface 16. A pair of spaced apart mounting hooks 26 extend from the platform 18 for cooperating with a pair of tow hooks 24 on the vehicle 12. At least one reaction member 30 extends from the platform 18 for contacting the vehicle 12 such that the platform 18 is oriented at a generally horizontal orientation in use.

Abstract: An RUV (Recreational Utility Vehicle), suitable for on-road and off-road multi-terrain use and having handlebar steering, a saddle seat, and at least four low pressure tires, is provided with a suitably elongated frame having front and rear suspensions spaced longitudinally therealong and respectively mounting a front pair of laterally spaced wheels and a rear pair of laterally spaced wheels. A sufficiently elongated saddle seat is provided on the frame in combination with a sufficiently elongated frame in combination with front and rear pair of wheels sufficiently longitudinally spaced apart in combination with front and rear suspensions designed to compensate for higher center of gravity and increased mass thereat all to accommodate at least two riders in tandem. A dynamic roll suppression assembly dynamically resists side roll of the vehicle.

Abstract: An step assembly (10) is described having a step (12) that moves between down and up positions by pivoting about a longitudinal axis connected to a vehicle chassis (24). One or more link assemblies (22) move the step between these positions. A support bracket (20) connects to the chassis and pivotally supports the step. The link assembly includes a first link (32) having one end fixedly attached to a drive shaft (14) in a radial manner and another end rotatably connected to a second link (34). The connection between the first and second links is located outward of the pivotal connection between the step and the support bracket. In one embodiment, in the up position, the point of rotation between the first and second links is located outward of the drive shaft axis of rotation. A stop is available to limit further rotational travel by the first link.