Abstract: An exemplary method associated with a crash gate configured to guard against motor vehicles crossing in a direction from an attack side to a protected side includes securing a buttress post assembly and a latch post assembly on opposite sides of a roadway, the buttress post assembly having two vertical buttress posts forming a barrier passage, the latch post assembly having two vertical latch posts forming a latch gap, and a vertical pin positioned in the latch gap; and mounting a moveable barrier in the barrier passage, the barrier including a rectangular frame with a horizontal gate beam extending from a buttress end to a latch end, the latch end including a hook open toward the protected side, wherein in a closed position the latch end is located in the latch gap.

Abstract: An automated rumble strip assembly includes a frame having a top surface configured to support a vehicle tire moving along the frame. The automated rumble strip assembly also includes a plurality of elongate members, each elongate member having a top surface. The automated rumble strip assembly also includes an actuator assembly configured to move the elongate members from a first position where each of the top surfaces of the elongate members is flush with the top surface of the frame, to a second position where each of the top surfaces of the elongate members is recessed relative to the top surface of the frame.

Abstract: A crash gate assembly includes a buttress post assembly secured in the ground and having two vertical buttress posts forming a barrier passage, a latch post assembly secured in the ground on the opposite side of a roadway from the buttress post assembly, the latch post assembly including two vertical latch posts forming a gap, and a barrier including a horizontal gate beam disposed in the barrier passage and extending from a buttress end to a latch end, the barrier slidingly positioned in a closed position with the barrier extending across the roadway and the latch end disposed in the latch gap.

Abstract: A bidirectional, spring-biased gate assembly includes a pair of side frames, an elongated hinge extending therebetween, and a gate extending vertically from the hinge. In a resting position, the gate extends vertically across an open interior between the pair of side frames, providing a movable barrier suitable for deterring and/or blocking animals from passing therethrough. The gate is able to transition between the resting position, a first lowered position perpendicular to the resting position, and a second lowered position perpendicular to the resting position in the opposite direction of the first lowered position. The gate assembly further comprises a plurality of springs extending between one of the side frames and the gate and are adapted to return the gate to the resting position from either the first lowered position or the second lowered position.

Abstract: A security gate is disclosed, including a pit, wherein the pit has a length and a width, at least one gate post, and a gate panel, wherein the gate panel is made up of multiple, spared apart structural members, wherein the gate panel is rotatably attached to the at least one gate post, wherein the gate panel has a length and a width, wherein the length of the pit and the length of the pit are substantially similar such that when the gate panel is horizontal it covers the length of the pit.

Abstract: Provided is a water blocking board apparatus which can improve reliability of the operation of a water blocking board, the apparatus having: a water blocking board configured to ascend from a road surface to block water; a water blocking board accommodating pit formed under the road surface so as to accommodate the board; a water collecting pit configured to let water to flow thereinto upon flooding; a water collecting bucket which accumulates water having flown into the water collecting pit and is configured to descend in the water collecting pit by the weight of the accumulated water; and a transmission mechanism which connects the board and the bucket and converts a descending force of the bucket into an ascending force of the board, at least one of the mechanism and the bucket being provided with a device for inhibiting inclination of the bucket.

Abstract: A vehicle comprises an outer shell having an opening and a cover for the opening. The cover comprises: a housing, a window and a motor for moving the window. The motor management unit stores three predetermined positions of the window relative to the housing. When the housing is engaged with the opening: in the first predetermined position the window is resiliently retained within the seal and the cover can be released from the opening without damage to the cover; in the second predetermined position the window does not engage with the seal; and in the third predetermined position the window extends into the seal and the window is prevented from being released from the seal without the window first being retracted to the first or second positions. The motor management unit causes the motor to extend the window to the third predetermined position when the vehicle exceeds a predetermined speed.

Abstract: Disclosed is a latching mechanism for a access door. More specifically, the disclosure relates to an access door that can be pivoted between opened and closed orientations and secured in the open position with the aid of a hold open arm. A latching lever, in turn, pivotally engages the hold open arm to selectively secure the access door in an opened orientation. A grip upon the hold open arm can thereafter be used in conjunction with the latching lever to release the access door and permit it to be closed.

Abstract: A barrier system comprises a housing, substantially vertical members, and vertical guide tubes. The housing extends into the ground. The guide tubes are positioned in the housing and also extend into the ground below the housing. The substantially vertical members are translatable vertically within the guide tubes. At least one barrier member is secured to the substantially vertical members. The at least one barrier member may comprise at least one guardrail, a plurality of chains or cables, and/or a plurality of gate beams. A series of cables and pulleys form an actuation system that raises and lowers the substantially vertical members relative to the guide tubes to selectively extend and retract the at least one barrier member relative to the ground. A cover plate may selectively cover the top opening of the housing when the barrier member and substantially vertical members are retracted within the housing.

Abstract: A barrier system comprises a housing, substantially vertical members, and vertical guide tubes. The housing extends into the ground. The guide tubes are positioned in the housing and also extend into the ground below the housing. The substantially vertical members are translatable vertically within the guide tubes. At least one barrier member is secured to the substantially vertical members. The at least one barrier member may comprise at least one guardrail, a plurality of chains or cables, and/or a plurality of gate beams. A series of cables and pulleys form an actuation system that raises and lowers the substantially vertical members relative to the guide tubes to selectively extend and retract the at least one barrier member relative to the ground. A cover plate may selectively cover the top opening of the housing when the barrier member and substantially vertical members are retracted within the housing.

Abstract: The present invention relates to a vault door mechanism that assists a user in opening or closing the door. A hold-open arm and hinge plate pivotally interconnect the door to a surrounding frame and are fixed in place by an associated locking mechanism. The locking mechanism stops the door in the partially opened position prior to being fully opened or closed, thereby assisting the user in handling the door. The details of the present invention, and the manner in which they interrelate, will be described in greater detail hereinafter.

Abstract: A temporary barricade in the form of a retractable post system. In one configuration, the post is lowered into the ground, such that the top of the post is flush with the ground surface, leaving an unobtrusive configuration that one can walk over, drive over, and so forth. In another configuration, however, the post can be pulled up from the ground, and with a moderate rotational twisting motion, locked into vertical position, thereby providing a strong barrier to traffic and other situations.

Abstract: A start gate assembly for use by a racer when racing on a ground surface is provided with a moveable start gate frame that is pivotally attached to a foundation platform and a moving mechanism for placing the moveable start gate frame in a ready position where the ready position is of sufficient height to obstruct forward movement of the racer. A control device is further provided that regulates the movement of the moveable start gate frame from the ready position to a go position and a start switch that activates the control device to initiate the moving mechanism.

Abstract: A collapsible barrier to enclose a body of water, maneuverable between a deployed enclosure position and a collapsed position which barrier is comprised of panels articulated to each other, a ground panel (1) and an enclosure panel (2) which panels are formed from struts (4,7) supported by side rails (5,6), the struts (7) of the ground panel (1) together comprise a plate in which slits (3) are made through which the enclosure panel (2) struts, consisting of rods (4), can pass, so that in the deployed position of the barrier, the walkway surface provided by the ground panel (1) is nearly continuous.

Abstract: The present application relates to a barrier assembly used to block access, improve security, and landscape property. The barrier assembly comprises at least a support assembly so configured to secure to the ground; a retractable assembly so configured to be received within the support assembly; and a locking assembly attached to the retractable assembly, the locking assembly comprising (a) a locking rod assembly configured to hold the retractable assembly in at least a first fixed position, (b) a tamper proof lock configured to maintain the orientation of the locking rod assembly, and (c) a locking tool configured to access the tamper proof lock and adjust the locking rod assembly so that the retractable assembly can be adjusted from the first fixed position to a second fixed position.

Abstract: A speed barrier includes a heavy lower barrier and a lighter upper gate. The barrier and gate may normally be positioned to allow or to restrict passing of vehicles. The barrier is configured to receive and survive the main impact of a vehicle attempting to ram through the speed barrier. The gate and barrier are coupled to allow an extension or a retraction of the gate and barrier in unison. The barrier and gate are supported by left and right columns, and an upper end of the gate is supported by the columns when the gate and barrier are extended.

Abstract: Anti-break-through safety barrier able to be used in correspondence with a site to be protected. The anti-break-through safety barrier comprises a plurality of modular elements coupled together so as to slide vertically with respect to the other. Each modular element comprises a stiff and armor-plated protecting wall, which is fixed laterally to a pair of supports. Each modular element is further movable between an inactive position, located below a determined trampling reference plane and a lifted position above the trampling reference plane to define a single compact protecting structure, stiff and armor-plated, anchored to the floor or to the ground.

Abstract: The present application relates to a barrier assembly used to block access, improve security, and landscape property. The barrier assembly comprises at least a support assembly so configured to secure to the ground; a retractable assembly so configured to be received within the support assembly; and a locking assembly attached to the retractable assembly, the locking assembly comprising (a) a locking rod assembly configured to hold the retractable assembly in at least a first fixed position, (b) a tamper proof lock configured to maintain the orientation of the locking rod assembly, and (c) a locking tool configured to access the tamper proof lock and adjust the locking rod assembly so that the retractable assembly can be adjusted from the first fixed position to a second fixed position.

Abstract: A rodent entrance blocking device and method includes a doorframe that has a first vertical support and a second vertical support. A base has a bottom side, a top side, a first lateral side and a second lateral side. A distance from the first lateral side to the second lateral side is substantially equal to a distance between the first and second vertical supports. A rigid plate has a bottom edge, a top edge, a first side edge and a second side edge. The bottom edge is hingedly coupled to top side of the base. The plate extends between the first and second lateral sides. A biasing member is mechanically coupled to the plate and biases the plate in a vertical orientation. The base is positioned between the first and second vertical supports of the doorframe. The base extends between the first and second vertical supports.

Abstract: A retractable road median used to divide a road that may be retracted to allow vehicles to cross it in the event of an emergency, comprising a median assembly, a frame assembly, a winch assembly, and a longitudinal base assembly. The retractable road median has means to move the median assembly from a retraced position into an extracted position and vise versa. In the retracted position, a cavity built underneath a road surface, retractably receives the median assembly therein. The longitudinal base assembly includes two angled lateral walls that, in the extracted position, are in a substantially vertical disposition and their longitudinal edges rest on the sidewalls of the median assembly. In the retracted position, the median assembly collapses into the cavity so that the angled lateral walls rotate into a nearly horizontal position to cover the cavity entrance, permitting vehicles to cross to the other side.

Abstract: A vehicle barrier is formed with a barrier gate mounted on a pair of opposing lift arms pivotally connected via pivot shafts to a support structure. A plurality of endless bands are looped around the opposing pivot shafts and positioned to pass through compartments in the barrier gate. The lift arms and the barrier gate may be fabricated from lightweight material, such as thin steel, aluminum or plastic, so that the stopping power of the vehicle barrier is provided by the anchored bands. In permanent or portable configurations, the lightweight barrier gate can be quickly raised by hydraulic cylinders, or other appropriate means, into a deployed position to interfere with the passage of a vehicle over the barrier. The anchoring of the bands at ground or below ground locations on both sides of the barrier provides stopping power without requiring massive barrier structures to be raised and lowered in use.

Abstract: The present application relates to a barrier assembly used to block access, improve security, and landscape property. The barrier assembly comprises at least a support assembly so configured to secure to the ground; a retractable assembly so configured to be received within the support assembly; and a locking assembly attached to the retractable assembly, the locking assembly comprising (a) a locking rod assembly configured to hold the retractable assembly in at least a first fixed position, (b) a tamper proof lock configured to maintain the orientation of the locking rod assembly, and (c) a locking tool configured to access the tamper proof lock and adjust the locking rod assembly so that the retractable assembly can be adjusted from the first fixed position to a second fixed position.

Abstract: The present invention includes a bollard assembly 1 containing an an elongated housing 4. A bollard 2 is spaced radially inward of the housing 4 and is axially displaceable therein. A threaded drive shaft receiver 32 is centrally fixed within the housing 4 for threaded reception of a threaded drive shaft 30. The threaded drive shaft 30 is thereby suspended within the housing 4 and threadedly received by the receiver 32. Upon activation of the drive shaft 30 operably connected to the bollard 2, rotation of the drive shaft 30 establishes simultaneous vertical displacement of the drive shaft 30 and the bollard 2.

Abstract: An ventilated gate for use with an overhead garage door. The ventilated gate is an added feature to a conventional overhead garage door and provides ventilation to a garage where such ventilation is unavailable through a conventional overhead garage door. The ventilated gate is in a flat position on a driveway in front of the garage door when not in use and in a raised position between the driveway and the bottom of the garage door when in use.

Abstract: A collapsible traffic barrier system is disclosed which includes a steel vault having a top treated with anti-skid material. A rod is rotatably mounted to support members inside the vault, wherein the rod extends across the vault from end to end. A plurality of bollards are coupled to the rod substantially near the first end thereof, whereby rotation of the rod rotates the bollards so as to extend the second ends of the bollards above the vault in a vertical direction, or raised position. An actuator having a first end anchored within the vault and a second end is coupled to the rod by means of an arm. The actuator is a worm-drive mechanism disposed for rotating the rod. A stop is anchored to the bottom of the vault for engaging the first ends of the bollards when the bollards are in the raised position.

Abstract: An apparatus and method for providing a portable, rapid deployable barrier system which utilizes autonomous operation and one or more gas generators to rapidly activate the barrier. The invention includes a barrier component installed beneath the ground surface or substantially parallel to the ground and raised by activation of the gas generator. The device can be trigger automatically without human intervention and thereby faster deployment of the barrier. The invention permits the passage of pedestrians, vehicles, etc. or activation into a barrier position.

Abstract: An apparatus and method for installing and deploying a barrier utilizing one or more gas generators. The invention includes a barrier component installed beneath the ground surface or substantially parallel to the ground and raised by activation of the gas generator. The device can be trigger automatically without human intervention and thereby faster deployment of the barrier. The invention permits the passage of pedestrians, vehicles, etc. or activation into a barrier position.

Abstract: An apparatus and method for installing and deploying a barrier utilizing one or more gas generators. The invention includes a barrier component installed beneath the ground surface or substantially parallel to the ground and raised by activation of the gas generator. The device can be trigger automatically without human intervention and thereby faster deployment of the barrier. The invention permits the passage of pedestrians, vehicles, etc. or activation into a barrier position.

Abstract: An automatic barricade includes a trench across a road that is covered by a grate allowing vehicular traffic during normal dry weather. Inside the trench is a series of barricade elements, each of which includes a float. When rising water fills the trench to a predetermined level, each float rises and elevates the elements above the road. The barricade elements are sufficiently robust and intimidating to deter motorists from driving over them but are spaced apart to be light enough to be easily actuated by the float. The barricade elements are sufficiently close together that vehicles cannot pass between them. In another embodiment, a sensor is adjacent the trench to detect rising water and communicates with a motor connected to the barricade elements for raising them to a traffic blocking position.

Abstract: A road block having an extensible bollard that is manually or electronically actuated by a powerful spring force for slow extension, and by both the spring and a power lift for rapid extension.

Abstract: A pylon or barrier arrangement which is recessed into the ground or other surface and includes a post-like pylon which is movable between an extended position for control of vehicular or pedestrian traffic, and a retracted position beneath the ground. Movement of the pylon is achieved by a linear-type drive mechanism which acts as a clutch by decoupling from an upright and rotatable smooth drive shaft during abrupt downward driving of the pylon to avoid damage to the internal components of the arrangement. A sealing arrangement is provided for preventing the entry of debris into the interior of the pylon arrangement, and a heating unit is provided for preventing seizure of the arrangement during harsh weather conditions.

Abstract: An underground gate system for use with driveways and many other applications. The system includes plural posts which are hydraulically raised and lowered to blocking or open positions. In the up position, the posts stand 18-36 inches tall and include decorative lighting for safety and visibility. In the down position, the gate elements are virtually invisible. A particular hydraulic control system is also disclosed. The system is designed to be controlled from an in-car or in-house location.

Abstract: A pylon or barrier arrangement which is recessed into the ground or other surface and includes a post-like pylon which is movable between an extended position for control of vehicular or pedestrian traffic, and a retracted position beneath the ground. Movement of the pylon is achieved by a linear-type drive mechanism which acts as a clutch by decoupling from an upright and rotatable smooth drive shaft during abrupt downward driving of the pylon to avoid damage to the internal components of the arrangement. A sealing arrangement is provided for preventing the entry of debris into the interior of the pylon arrangement, and a heating unit is provided for preventing seizure of the arrangement during harsh weather conditions.

Abstract: A device for prevention of theft of a vehicle and for keeping a parking space for a vehicle when the vehicle is not parked in the space. The device is a collapsible barrier controlled by a remote control. It has a novel mechanism of protecting accidental damage to cars and to the barrier itself. Protection is afforded by means of a biasing element built into the device which gives way when accidentally hit by an approaching car and then automatically returns to a vertical position. When the vehicle with the remote control approaches and is about to hit the barrier a warning alarm is sounded, or in another embodiment of this invention, the remote sensor in the device is automatically lowered when it senses the approaching vehicle. In another embodiment of this invention the collapsible barrier is secured onto a ceiling above a parking surface enabling a convenient electric source for the devices and easier maintenance and central control over numerous barriers placed in a large parking facility.

Abstract: A removable post assembly for securing an area, basically comprising an anchorage assembly, an elongated post member and a locking assembly to lock and secure the removable post member to the anchorage assembly. The anchorage assembly includes housing with an upper opening adjacent to the ground level to cooperatively receive a portion of the elongated post member. The housing has cavities or bay members to selectively receive a latching member of the locking assembly. The elongated post member is tubular and includes lateral openings positioned at its lowermost portion, that once the former is placed inside the housing of the anchorage assembly, the lateral openings are in horizontal alignment with the bay members to allow the piercing of the latching member. The locking assembly includes a lock mounted to the upper end of the post member.

Abstract: A barrier device for preventing passage, having a simple construction and capable of being lowered into a shallow trench. The barrier device, preferably constructed as a gate for preventing passage to and from buildings or property, comprises a moveable framework for supporting a telescopic barrier arrangement and a movement device for moving the support device between a barrier position and an open position of the telescopic barrier arrangement. The telescopic barrier arrangement is shortened during the movement from the barrier position to the open position with the help of a counter-force which can be applied by a sunken base, and extended in the opposite direction during movement from the open position to the barrier position, with the help of the force of gravity.

Abstract: A railway gate system comprising a railway station having an elevated platform area for passengers to stand and a recessed area with a track and a train movable therealong. A gate has a continuous upper restraining rail along its length. A plurality of cylindrical posts each have an upper end secured to the lower surface of the rail and a lower end. A horizontal recess and vertical apertures are located in the edge of the platform area adjacent to the track. The recess is adapted to receive the rail when lowered to an inoperative orientation and with the circular apertures adapted to slidably receive the posts. Motion imparting mechanisms include elongated pistons having upper ends secured to the lower surface of the rail, central extents extending through selected spaced circular apertures in the platform and lower ends. Hollow cylinders are located beneath the selected spaced circular apertures having open upper ends to receive the pistons.

Abstract: The present invention to provides a rapidly deployable system and method for arresting the movement of a vehicle with minimal injury to the vehicle or its occupants. The invention provides a system which applies a braking force which varies according to vehicle weight and speed by utilizing a series of frangible rods for dissipating the energy.

Abstract: There is disclosed a transportable device and associated method for impeding the motion of a land vehicle travelling along a pathway on a terrain surface. First and second supports are positioned at first and second sides of the pathway, respectively, each capable of being actuated from a compressed condition to an extended condition. A propulsion system is effective to actuate the supports. A barrier extends between the supports at a mean first height that is effective to permit passage of a vehicle when the supports are compressed and supported by each support at a mean second height effective to impede passage of the vehicle when the supports are extended. When the supports are compressed, vehicles pass over the barrier unimpeded. When the supports are extended, the barrier impedes the motion of a vehicle travelling along the pathway. At least one deceleration cable mechanically couples the barrier to a brake system.

Abstract: The present invention relates to an improved security control barrier for use in controlling ingress and egress to entranceways, exit ways, driveways, and parking spots. The device consists of a telescoping bollard inserted into a casing imbedded below ground and a locking mechanism for securing the telescoping bollard in the extended and retracted positions. The invention also serves as an effective anti-theft device.

Abstract: A vehicle security gate apparatus and methods are provided for inhibiting undesired access to a protected area. The vehicle security gate apparatus preferably has a barricade adapted to be positioned adjacent a roadway to thereby block vehicle passage along the roadway into an area desired to be protected. The apparatus also preferably has a barricade rotating mount connected to the barricade for rotating the barricade about a predetermined axis so that the barricade rotates about the predetermined axis between a vehicle passage position which allows a desired vehicle to readily pass along the roadway into the protected area, a vehicle blocking position which blocks the roadway so as to inhibit an undesired vehicle from readily entering into the protected area, and a vehicle arresting position which arrests an undesired vehicle responsive to an attempt by the undesired vehicle to ram the barricade when the barricade is positioned in the vehicle blocking position.

Abstract: A lockable and removable barrier assembly (10) includes a post (32) which is removably mounted in a sleeve (12). The bottom end (32B) of the post is mounted in the top end (12A) of the sleeve such that a securing opening (14) of the sleeve is aligned with a securing opening (35) of the post. A securing mechanism (42) is located in the inner chamber (32C) of the post. The securing mechanism includes a securing lever (52) which is pivotably mounted at the bottom end (52B) to a mounting bracket (44). The lever includes a securing lug (58) which extends through a securing opening in the post and sleeve to secure the post in position in the sleeve. The top end (52A) of the lever is held in the secured position by a lock (60) which extends through a hole in the end of the lever and through a hole in the locking bracket (48) mounted on the sidewall of the post in the inner chamber.

Abstract: A method and apparatus for deflating a tire of a vehicle, the apparatus including a housing having at least one channel member and at least one opening provided in the housing, and at least one deflator connected to the housing, an actuating cam slidably housed in the channel member and being removable from a first position to a second position, the cam engaging the at least one deflator when in the first position and respectively moving the at least one deflator into the at least one opening upon sliding of the cam from the first position to the second position so as to be engagable with a tire of a vehicle and a mechanism for sliding the cam in the channel member.

Abstract: A heavy duty shock absorber system for resisting large forces as may be encountered, for example, in a restraining barrier for a railroad crossing. A concrete bunker with an upstanding concrete-filled steel pipe has a hydraulic, compressive shock absorber mounted on the steel pipe for rotational, axial, and orthogonal movement. Forces applied to the shock absorber always pass through the axis of the steel pipe, thereby maximizing the resistance to the force while minimizing the necessary size of the system. A net is stored in a pit transverse the roadway parallel to the railroad tracks and is raised and lowered as appropriate. Each end of the net is attached to shock absorbing systems of the type described above.

Abstract: A vehicular traffic controller is disclosed wherein the control mechanism is positioned beneath the road surface. A plurality of transversely spaced levers extend upwardly from the surface. The levers are coupled to a shaft journaled for rotation below the road surface. Shaft rotation and lever retraction is effected by an operator to withdraw the levers to a position beneath the surface. Each lever is provided with a tire disabling member. A vehicle traversing the control point with the levers extended imparts rotation to the levers and causes the disabling members to damage the vehicle tires.

Abstract: A parking barrier permanently installed in vehicle parking surface, which has a base (20), with legs (22) embedded within the surface. A hinge plate (28) is attached to the base and allows the barrier to be rotated to a horizontal position permitting a vehicle to safely pass over the collapsed barrier. A channel shaped post (34) is pivotally attached to the hinge plate and a rigid strut (40) is retained on one end within the post and, on the other, to the hinge plate. The strut forms a right angle triangle with the post. A pull pin (46) holds the upper end of the strut in place and when removed, permits the barrier to be rotated horizontally removing the obstruction. A second, or electromechanical, embodiment utilizes a linear actuator (84) for the strut. An electronic controller (100) receives a signal through a coded radio frequency transmitter (102) and receiver (104) and, in turn, energizes the actuator to rotate the barrier into a horizontal position.

Abstract: When a post 10 is hit by a car in the direction indicated by arrow 42 the post moves a restricted amount in the direction of that arrow and that movement causes a support member 34 to be lifted up to raise the front wheels of the car off the ground. A plate 58 is secured to the underside of the support member 34 and, during raising of the support member 34, the plate passes over a series of notches 56. However, the plate 58 abuts those notches 56 to prevent the support member 34 moving downwardly again.

Abstract: A vehicle barrier in which two arms (6, 10) linked by a linking member (14) are pivoted to a base structure (1) so that they collapse into a recess (5) in the structure to "open" the barrier. To close the barrier the arms are raised and may be latched and locked in place, the arms and structure preferably forming a triangular shape when erect.

Abstract: A system for above grade and below grade installation, for rendering the mass weightless in preparation to being lifted subject to its mass inertia, wherein a pre-charge is applied to the pneumatic end of a pressure accumulator at a pre-set pressure, and an adjustment made charging the other end of the accumulator with a working fluid for balancing the mass as required against gravity and with a volume of working fluid to ensure operation, the pre-set gas pressure being increased by the adjustment to apply a working pressure for counterbalancing the mass above and below its weight as required.

Abstract: A removable post assembly for securing an area including basically four parts: an underground base member, a removable post member, a hinge assembly and a locking mechanism. The underground base member includes a housing that partially receives the post member and an anchorage assembly mounted to the housing assembly. The hinge assembly includes two leaves and one of them is pivotally mounted to the housing at a position substantially adjacent to the ground level. The locking mechanism locks the other hinge leaf to the removable post member. A cover is rigidly mounted to the post member so that it houses the locking mechanism thereby protecting it from tampering. The cover includes a bottom opening that permits a user to insert a key or otherwise release the locking mechanism. The bottom opening is sufficiently close to the ground level to prevent the introduction of any tampering tools.