Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
  • E01F13/00—Arrangements for obstructing or restricting traffic, e.g. gates, barricades ; Preventing passage of vehicles of selected category or dimensions
  • E01F13/04—Arrangements for obstructing or restricting traffic, e.g. gates, barricades ; Preventing passage of vehicles of selected category or dimensions movable to allow or prevent passage
  • E01F13/044—Arrangements for obstructing or restricting traffic, e.g. gates, barricades ; Preventing passage of vehicles of selected category or dimensions movable to allow or prevent passage the barrier being formed by obstructing members situated on, flush with, or below the traffic surface, e.g. with inflatable members on the surface
  • E01F13/046—Arrangements for obstructing or restricting traffic, e.g. gates, barricades ; Preventing passage of vehicles of selected category or dimensions movable to allow or prevent passage the barrier being formed by obstructing members situated on, flush with, or below the traffic surface, e.g. with inflatable members on the surface the obstructing members moving up in a translatory motion, e.g. telescopic barrier posts

Definitions

• the invention relates to an elastic mechanism for transforming a rotary movement into a linear movement, intended in particular to move retractable terminals.
• Retractable bollards are an elegant and relatively aesthetic means, compared to a barrier for example, to control the access of motor vehicles to certain areas, pedestrian in particular.
• a terminal located on the roadway can retract into the ground using various motor means, in order to allow the passage of selected vehicles (residents, priority vehicles, delivery people, for example) .
• Fig. 1 The different models existing to date all consist (Fig. 1) of a movable block (2) retractable in a buried box (l), which also contains all or part of the mechanism intended to move the block (2) .
• These mechanisms are all jacks (3): hydraulic, pneumatic, electric, or others, depending on the manufacturer.
• a cylinder constitutes a variable volume system, which can pose very troublesome sealing problems, especially when it is an electric cylinder.
• the device according to the invention overcomes these drawbacks. It comprises, according to a first characteristic, a connection mechanism between a rotating motor means (therefore a fixed volume system, in general an electric geared motor group) and the movable stud, making it possible to transform the rotational movement of the axis motor unit output in a linear translational movement communicated to the movable stud.
• This mechanism requires for its installation a box whose height can be limited to about h + 25 mm, h being the useful height of the movable stud (2), that is to say the height deployed above ground. It can also constitute an elastic connection between the motor and the stud, thus protecting the assembly against shocks.
• FIG. 1 shows in section the device according to the invention.
• Figure 3 shows a variant of this device.
• the device consists of two identical parts (A) and (B), helical, of round, square or other section, joined at their upper part by any suitable means, or even manufactured in one holding as in Figure 2 (hatching at ⁇ 45 ° were however used for understanding).
• These two helicopters (A) and (B), fixed in rotation, are nested one inside the other with an offset of half a step and enclosed in the assembly stud (2) - slide (7).
• the lower ends (A ') and (B'), opposite 180 ° can be left free or maintained by any means either to increase the rigidity of the assembly, or for any other reason. In the case of FIG. 2, they have been bent outwards and inserted into two holes in the slide (7).
• An axis (4) inserted horizontally in the parts (A) and (B) is provided at its ends with two rollers (Gl) and (G2) which bear on the two helicoid (A) and (B), which serve them raceway.
• the slide (7) can actuate a microswitch (not shown) which will control the stopping of the motor, this stopping being able to be obtained by any other means.
• a rotational movement, opposite to the previous one, of the shaft (5), will cause the parts (A) and (B), the collar ( ⁇ ), the slide (7) and the stud (2) to descend.
• the flange ( ⁇ ) comes to rest on the spacer (9)
• (A) and (B) will compress slightly before the engine stops, keeping the stud (2) firmly in the low position.
• the rotation movement - displacement relationship described here can be reversed by reversing the pitch of the helicoid (A) and (B).
• the system can be made reversible by choosing the pitch of (A) and (B), and the type of gear motor.
• the term reversible system designates here that in which a translational force applied to the ⁇ lot (2) will result in a rotation of the axes (4) and (5).
• the speed of movement of the stud (2) is determined by the pitch of the helicoid (A) and (B) as well as by the speed of rotation of the axis (4).
• the pitch of the helicoids can be made variable so as to obtain, for a constant speed of rotation, a variable speed of translation.
• the helical parts (A) and (B) can be replaced by a single cylinder in which one will have practiced, by milling in particular, two helical grooves offset by half a step, and which will serve as a rolling path for the two rollers (Gl) and (G2).
• the pitch of the grooves is constant or not.
• rollers (Gl) and (G2) can be substituted for any parts capable of bearing and sliding on the raceways.
• the two pieces (A) and (B) are nested one inside the other so that two consecutive turns (Sl) and (S2) belong to each of the pieces (A) and (B) and are separated by half a step from the helicoids.
• the pieces (A) and (B) are joined at their ends or are left free, and can be fixed to the ⁇ lot (2) which contains them.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Transmission Devices (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9435275

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (1)

Family Cites Families (4)

• 1992
  • 1992-11-02 FR FR9213348A patent/FR2697548B1/fr not_active Expired - Fee Related
• 1993
  • 1993-11-02 WO PCT/FR1993/001078 patent/WO1994010391A1/fr not_active Application Discontinuation
  • 1993-11-02 EP EP93924664A patent/EP0625226A1/de not_active Withdrawn

Non-Patent Citations (1)

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