FR2627200A1 - Road barrier for vehicles - comprises plates with sharpened teeth underneath which can be raised to prevent passage of unauthorised vehicles - Google Patents

Abstract

The road barrier, for preventnig unauthorised passage of vehicles, consists of a elongated rectangular supporting frame which is embedded in the road and containing a series of hinged plates (10) which can be raised to expose sharpened teeth (14) which will puncture the tyres of any vehicle which tries to pass. The barrier incorproates a drive, e.g. in the form of a two-way power cylinder, which moves the plates and teeth between a position in which the plates lie flush with the road surface, and the raised position where the teeth are exposed. Each of the teeth is fixed at right angles to the undersurface of a plate, and has sharpened edges on each side of its tip, and the barrier can be equipped with a detector system to raise and lower it automatically, operating an electric motor and hydraulic cylinder. ADVANTAGE - Easier to maintain.

Description

Barrier to prevent the passage of vehicles on a lane.

The invention relates to a barrier to prevent the passage of vehicles on a lane.

There are already known barriers or dams preventing the passage of vehicles on a track. Generally such barriers, also called "harrows" include a frame embedded in the track supporting a deck provided with openings for the passage of a plurality of teeth. Under the control of mechanical means, the teeth come out of the decking and are held in the raised position in order to fulfill their function of blocking the track.

Such barriers are not satisfactory because the openings through which the teeth exit, allow dirt to penetrate into the decking. I1 results in difficult maintenance of the deck and mechanical means driving the teeth out of said deck.

The invention provides a solution to this problem.

An object of the invention is to provide a barrier equipped with a plurality of retractable plates each provided, on their internal face, perpendicularly, with at least one tooth as well as equipped with drive means allowing the placement of the teeth in a position lowered in which the pads are flush with the track which allows the passage of vehicles on the outer face of the pads, and in a raised position in which the teeth protrude relative to the track in order to prohibit the passage of vehicles over said way.

Another object of the invention is to provide a barrier preventing the passage of vehicles on a track which offers easy maintenance of the constituent and essential elements of the barrier and which has a beautiful aesthetic in particular by masking the aggressiveness of the teeth.

The invention relates to a barrier for preventing the passage of vehicles on a lane.

According to a general definition of the invention, the barrier comprises in combination - an elongated support frame, capable of being embedded in the track and comprising two lateral flanks across which is mounted a free axis in rotation, - a plurality of plates each provided, on their internal face, perpendicularly, with at least one tooth integral with the axis of rotation and suitable for puncturing the tires of vehicles in contact with them, - means suitable for driving the axis of rotation to place the teeth in a lowered position in which the pads are flush with the track and in which the teeth are housed in the support frame, which makes it possible to hide said teeth as well as to allow the passage of vehicles on the external face of the pads, and in a position raised in which the teeth project externally in order to prevent the passage of vehicles on said track.

According to a preferred embodiment of the invention, the means for driving the axis of rotation comprise a double-acting cylinder, the rod of which comes to fit in a rod integral with the axis of rotation.

Preferably, each tooth is of rectangular shape comprising - a first wide edge fixed perpendicularly to the internal face of a plate, - a second free wide edge subdivided substantially in its middle into a sharpened upper part and into a lower part, - a first narrow edge in the shape of a sharp point comprising two sharp straight segments of increasing obliqueness extending to their respective wide edges, and - a second narrow edge fixed around the axis of rotation using a flange.

Preferably, detection means identify the position of the teeth.

In practice, the double-acting cylinder is of the hydraulic type with electrical control and the barrier further comprises a hydraulic unit equipped with a reservoir supplying a pump actuated by an electric motor as well as a distributor capable of alternately directing the fluid flows. coming from an accumulator to the chambers of the double-acting cylinder and vice versa, the admission of the fluid to the corresponding chamber as well as its expulsion being controlled by a pressure switch controlling the operation of the pump as well as the recharging of the accumulator.

Advantageously, an additional pressure switch signals from a distance the value of the pressure of the fluid circulating in the hydraulic circuit.

Other characteristics and advantages of the invention will emerge on examining the detailed description below, and the appended drawings in which - Figure 1 is a top view of the barrier in the lowered position, the plates being removed to reveal the mechanism; - Figure 2 is a longitudinal and vertical sectional view along AA of a tooth in the rest position (solid line) and in the raised position (center line) according to the invention; - Figure 3 is a longitudinal and vertical sectional view along BB showing 1tentrainement per cylinder; - Figure 4 is a cross-sectional view along CC illustrating the location of the position of the teeth according to the invention; - Figure 5 is a cross-sectional view along DD of said detection means according to the invention; - Figure 6 is a top view of the barrier in the lowered position, with the pads; - Figure 7 is a perspective view of the barrier in the raised position; and - Figure 8 is a schematic view of the hydraulic device actuating the cylinder according to the invention.

The accompanying drawings contain elements of a certain character in many respects. They can therefore not only serve to clarify the description below, but also contribute to the definition of the invention, if necessary.

As shown in FIGS. 1 and 2, the barrier capable of being embedded in the track comprises a support frame 2 elongated in the form of a rectangular frame comprising two sides 3 and 5 with a length of between 2.5 m and 4 m , capable of being placed across the track to be protected and two lateral flanks 4 and 6 with a width of the order of 1 m through which a free rotating axis 8 is mounted.

The support frame 2 is advantageously made of sheet steel 5 mm thick striated with tears 2 mm thick. The support frame 2 as well as the essential and constituent elements of the barrier which will be described below are hot-rolled and are treated by sandblasting, zinc metallization from 80 to 100 micrometers and electrostatic plasticization of three layers for example. Such an anti-corrosion treatment gives these elements better weather resistance.

The support frame 2 consists of a deck comprising a plate 9 (FIG. 6), the rear part 11 of which completely closes the support frame 2, while its front part is perforated to allow the passage of the teeth. This front part will be surmounted by the plates 10.

The decking is supported by beams 13 equidistant from each other and bearing on the lower plate 15 of the support frame 2.

The plates 10 are each provided, at their internal face 12, perpendicularly, with at least one sharpened tooth 14 secured to the axis of rotation 8 and suitable for lacerating the tires 16 of the vehicles in contact with them.

The word "sharp" here means sharp and sharp. It is not imperative that the teeth have undergone a positive sharpening or sharpening operation.

Of course, it will be possible, for at least certain applications, to modify the size of the teeth, and / or their height on the ground, according to the type of vehicle to be stopped.

The material constituting the teeth 14 of parallelepiped shape can be a special steel with high mechanical strength, for example XC48 steel. This material is also treated against corrosion.

Each tooth here has a rectangular section of the order of 60x20mm.

One of the wide edges 20 of the tooth is fixed perpendicular to the internal face 12 of a plate 10 using a screw "18, and a wcimblot" 19, consisting of a doubly frustoconical tenon making office of centering pin avoiding the shearing of the screws 18 by ensuring a micrometric displacement of the wafer.

This ensures good mechanical strength of the plate / teeth assembly, despite numerous vehicle passages.

The other of the wide edges 22 is subdivided substantially in its middle into a sharp upper part 24 and into a lower part 26. The upper wide edge of the tooth is intended to lacerate the tires of vehicles.

One of the narrow edges 28 of the tooth is in the form of a sharp point comprising two sharp straight segments 30 and 32 of increasing obliqueness extending to their respective wide edges 20 and 22. The point of the tooth is intended puncturing vehicle tires.

 The other of the narrow edges 34 of the tooth is fixed around the axis of rotation 8 with the aid of a clamp 36 with high tightening by a screw 40. Optionally, the axis 8 could be chamfered at the level of the teeth ; other means can be used to fix the angular tooth / axis position.

The teeth 14 are pivotally mounted around the axis of rotation of the shaft 8 to occupy either a lowered position or a raised position.

The teeth 14 in the fixed working position (raised position) are inclined relative to the decking by an angle greater than 45 and substantially close to 60.

When the teeth are in the lowered position, the lower part of the wide edge 26 comes to bear on a base 42 provided with a first stop 46. The base 42 is integral with the lower plate 15 of the barrier.

When the teeth are in the raised position, the lower part of the wide edge 26 of a tooth comes to bear on the base 42 provided with a second stop 48. In this position, the stop 48 compensates for all the vertical forces of the overturning torque tooth 14 when it is in contact with the tires 16 to be punctured of the vehicle. The stops 46 and 48 are adjustable and are made of a special material ensuring the damping and the silence of the operation of the barrier. This special material is for example VULKOLLAN (registered trademark).

We now refer to Figure 3. There is a tooth 14 in the lowered position. The pivoting movement of the teeth between a lowered position and a raised position is caused by a double-acting cylinder 50, hydraulic, electric or pneumatic.

The jack 50 comprises a body 52 provided with two chambers 54 and 56 respectively controlling the displacement of the jack forwards and backwards around the pivot axis 57.

The rod 58 of the jack 50 enveloped in a male yoke 60, enters a female yoke 62 pivotally mounted about an axis 64. A link 66 secured to the axis 64 is provided with a groove 68 surrounding the axis of rotation 8, The link 66 transmits the rectilinear movement of the jack to the axis of rotation 8 by means of a flat 70 fixed on the groove 68 around the axis 8 by four screws 72.

In dashed lines, there is shown the rod 66 transmitting the rectilinear movement of the jack in order to place the teeth in the raised position.

Advantageously, the main rotation shaft 8 is made of special steel, for example 3Q4L steel, machined and guided by bearings with sealed and floating bearings 80 individualized at 80-1 to 80-4 (FIG. 1). At the level of the drive cylinder, a device (not shown) can be provided which allows manual movement of the teeth.

We now refer to FIG. 4, where we find the link 66 transmitting the rectilinear movement of the jack 50 to the axis of rotation 8.

Four inductive proximity detectors 84 individualized at 84-1 to 84-4 are mounted on the bottom plate 15 of the barrier to control the position of the teeth 14. In practice, each pair of detectors 84-1, 84-2 and 84- 3, 84-4 marks the position of tooth 14-1 and tooth 14-2 respectively. Thus, the position of the teeth is detected despite the non-functioning of a detector.

The beams 13 parallel to the lateral flanks 2 and 4 serve to support the chassis-support 2 of the barrier.

In FIG. 5, there are the detectors 84 controlling the position of the teeth 14.

Referring now to Figure 6. There is shown the barrier in the rest position in which the plates 10 are flush with the track. An inspection hatch 100 located opposite the jack allows easy access thereto. The decking of the barrier as well as the plates can be painted in striking colors such as red, yellow, black, white. The teeth 14 can be painted red and coated with a reflective paint only on the sharpened parts.

We now refer to Figure 7. There is shown the barrier in the working position in which the teeth project externally.

We see that each plate 10 is associated for example with two teeth 14. Thus, a barrier with a length of 2.5 m for example comprises five plates 10 of 50 cm in length each and each provided on their inner face with two sharp teeth 14.

In a closed barrier situation, that is to say when the plates are flush with the track, the teeth 14 disappear completely and are housed in the support frame 2. They no longer allow a glimpse of the space between them and the openings in the decking. This masking avoids the penetration of dirt in the decking which facilitates maintenance and improves aesthetics.

The barrier according to the invention allows the passage of vehicles on the external face of the plates in a bidirectional manner and prohibits the passage of vehicles in a unidirectional manner. A head-to-tail arrangement of two barriers according to the invention allows a bidirectional barrier to the track. It is also possible to provide retarders for raising and lowering the teeth to give the barrier greater longevity and better functioning.

Referring now to Figure 8 which shows an example of the hydraulic device actuating a cylinder 50 described above of the hydraulic type.

The hydraulic device comprises a hydraulic unit equipped with a 15-liter sheet steel tank R supplying a gear pump P actuated by an electric motor M. The maximum flow rate of the pump is 5.6 liters per minute. The electric motor M has a power of 1.5 kw for a maximum pressure of 120 bars. A non-return valve C1 equipped with a filter 10 micrometers in diameter closes the hydraulic circuit on the tank R. There is also provided a drain valve VI as well as another non-return valve C2 upstream of the accumulator A which will be described below.

A distributor D1 employing sealed electromagnets alternately directs the fluid flows coming from the accumulator A with a capacity of 1 liter towards the chambers 54 and 56 of the jack 50 and vice versa. In other words, the distributor D1 for example directs on one side the fluid flow coming from the accumulator A towards the chamber 54 and on the other hand the fluid flow coming from the chamber 56 towards the accumulator A The admission of the fluid to the corresponding chamber as well as its expulsion are controlled by a pressure switch PT1 controlling the stopping of the pump P and the recharging of the accumulator A. For example, when the fluid is at a lower or equal pressure at 60 bars, the pressure switch PT1 controls the recharging of the accumulator A until a pressure of 90 bars is reached. When the fluid is at a pressure of 90 bars, read pressure switch PT1 controls the stop of the pump P.

The hydraulic circuit also includes a pressure gauge N with its valve V2 to indicate the pressure of fluid flowing in the hydraulic circuit, as well as a pressure limiter L1 connected to the distributor D1 to limit the pressure of the fluid to 110 bars.

A pressure switch PT2 is also connected to the hydraulic circuit to remotely signal the value of the pressure of the fluid circulating in said hydraulic circuit.

Another distributor D2 coupled to another pressure relief valve L2 makes it possible to drain the hydraulic circuit in good conditions in the event of a power cut. The distributor D2 can be controlled manually using an awl screw.

To make it easier to understand the operation of the hydraulic device, references *, p and T have been shown in FIG. 9 opposite the hydraulic pipes to indicate their operating state, namely p for under pressure, * for plugged and T for directed towards the tank.

The hydraulic power plant is, for example, that sold by the Compagnie Parisienne Tooling Air Compressed (CPOAC) under the reference CPI 15-1.5-6-F3-Cl-Al-A3-Al-G.

The distributors D1 and D2 are for example those sold by CPOAC under the reference 081WV06-PlN-133-WS-i2-00 and 081-Wv06-PlN-108-WS-12-00.

The accumulator A is for example that sold by.BOSCH under the reference H! -AB1-300-C2.

Finally, the PT1 and PT2 pressure switches are for example those sold by TELEMECANIQUE respectively under the reference XMG 8140 and XM2 JA1607.

Using such a hydraulic circuit, the jack 50 can place the teeth 14 from the lowered position to the raised position in 300 milliseconds. The cylinder can be actuated every 5 seconds which is the time necessary to recharge the accumulator A.

Thus the duration of a complete cycle of the barrier, that is to say: passage from the lowered position to the raised position and vice versa, is of the order of 5.3 seconds.

The barrier according to the invention can have the following configurations - on the one hand, a configuration called a positive safety configuration in which the barrier is kept in the raised position (passage prohibited) and in which the release of the barrier takes place after control; - on the other side, a configuration called negative security configuration in which the barrier is kept in the lowered position (passage allowed) and in which the barrier is triggered automatically in response to signals sent upstream by actuated sensors by the infringing vehicle.

Claims (6)

Claims. 1. Barrier to prohibit the passage of vehicles on a track, characterized in that it comprises in combination - an elongated support frame t2), capable of being embedded in the track and comprising two lateral sides (2 and 4) in through which is mounted a free rotating axis (8), - a plurality of plates (10) each provided, in their internal face, perpendicularly, with at least one tooth (14) integral with the axis (8) and clean puncturing the tires of vehicles on contact with them, - means (50) capable of driving the axis (8) to place the teeth (14) in a lowered position in which the pads are flush with the track and in which the teeth (14 ) are housed in the support frame (2) which makes it possible to hide said teeth (14) as well as to allow the passage of vehicles on the external face of the pads (10), and in a raised position in which the teeth (14 ) project outwardly to prevent the passage of vehicles on said track. 2. Barrier according to claim 1, characterized in that the drive means (50) comprise a double-acting cylinder, the rod (58) of which is adjusted in a rod (66) integral with the axis of rotation (8). 3. Barrier according to any one of the preceding claims, characterized in that each tooth (14) is of rectangular shape comprising - a first wide edge (20) fixed perpendicular to the internal face (12) of a plate (10) , - a second free wide edge (22) subdivided substantially in its middle into a sharpened upper part (24) and into a lower part (26), - a first narrow edge (28) in the shape of a sharp point comprising two straight segments sharpened (30 and 32), of increasing obliqueness extending to their respective wide edges 20 and 22, and a second narrow edge (34) fixed around the axis of rotation (8) using a flange (36). 4. Barrier according to any one of the preceding claims, characterized in that detection means (84) identify the position of the teeth. 5. Barrier according to claim 2, characterized in that the double-acting cylinder (50) is of the hydraulic type with electrical control and in that the barrier further comprises a hydraulic unit equipped with a reservoir (R) supplying a pump (P) actuated by an electric motor (M) as well as a distributor (D1) capable of alternately directing the fluid flows coming from an accumulator (A) towards the respective chambers of the double-acting cylinder (50) and vice versa, the admission of the fluid to the corresponding chamber as well as its expulsion being controlled by a pressure switch (PT1) controlling the operation of the pump (P) and the recharging of the accumulator (A). 6. Barrier according to claim 5, characterized in that an additional pressure switch (PT2) signals remotely the value of the pressure of the fluid flowing in the hydraulic circuit.