GB2309727A - Retractable bollard - Google Patents
Retractable bollard Download PDFInfo
- Publication number
- GB2309727A GB2309727A GB9700337A GB9700337A GB2309727A GB 2309727 A GB2309727 A GB 2309727A GB 9700337 A GB9700337 A GB 9700337A GB 9700337 A GB9700337 A GB 9700337A GB 2309727 A GB2309727 A GB 2309727A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bollard
- ground
- raised position
- constant force
- retracted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
Abstract
A bollard (1) comprises a base (4), which is arranged to be fixed wholly in the ground, and an elongate body (6) which is arranged to be movable relatively to the base (4) between a retracted position in which it is accommodated wholly within a hole in the ground, and a raised position in which it extends above the ground. A constant force biasing means (10) is provided for biasing the body (6) towards its raised position. There may be more than one such spring and there are means for locking the body in a raised and a lowered position. Additionally, there may be means for raising and/or lowering the body.
Description
BOLLARD
In many places, such as car parks, market places, and stadia, it is frequently necessary to erect temporary bollards to control the movement or parking of vehicles.
Traditionally, such temporary bollards have been free standing and have been laid in position by hand. In recent years, however, the use of such temporary bollards has been superseded by the provision of more permanent bollards which are accommodated beneath ground level when the bollard is not required, but which can be lifted and secured in a raised position when required. Such bollards have considerable advantages over temporary bollards in that they do not have to be stored away from their place of use and in that they are far more secure, and cannot be easily knocked or lifted out of position. Such bollards do, however, have problems. In order to provide a sturdy construction they are often made from heavy materials such as steel. This means that such bollards can be difficult to lift into their raised position.Attempts have been made to overcome this problem by the provision of hydraulic raising and/or lowering systems, but these are expensive and difficult to install.
According to the present invention there is provided a bollard comprising: a base, which is arranged to be fixed wholly in the ground, and an elongate body which is arranged to be movable relatively to the base between a retracted position in which it is accommodated wholly within a hole in the ground, and a raised position in which it extends above the ground; and constant force biasing means for biasing the body towards its raised position.
Preferably, the constant force biasing means is one or more constant force springs. The bollard may be provided with means for locking the body in its retracted and/or raised position.
The bollard may be provided with an outer sleeve which surrounds the body when retracted to protect the body from the collapse of surrounding soil when the bollard is installed in the ground.
The bollard may be provided with a raising and/or lowering mechanism, such as an electric motor.
The provision of the constant force bias means ensures that little, if any, effort is required by a user to lift the body into its raised position. It also ensures that a regular force is required to move the body into a retracted position, rather than an irregular force with a large force at either the start or end of a retraction. This means that there is no need for a user to exert excessive force either at the start or end of the retration operation, and the likelihood of injury is reduced. Even if a raising and/or lowering mechanism, such as an electric motor, is employed, the biasing means has considerable advantages in that little force is required from such a mechanism in order to raise or lower the body, and that only constant force is required from such a mechanism.
The preferable provision of a spring or springs as the constant force bias means ensures that the effect of extremes of temperature on the provided biasing force (as would occur if a gas cylinder biasing means were used) is greatly reduced.
One example of the present invention will now be described with reference to the accompanying drawing, in which:
Fig. 1 is a cross-sectional side view of a bollard according to the present invention in the retracted position.
The bollard 1 has an outer sleeve 2 which, when the bollard 1 is installed, is placed in the ground and surrounded by soil, concrete or other material. Lugs 3, which are attached to the outer sleeve 2, prevent removal of the bollard once installed. Attached to the base 4 of the outer sleeve 2 is a support member 5. The support member 5 is, in turn, slidingly attached to an elongate body 6. The elongate body is arranged so that it can move from a retracted position (as shown) to a raised position, in which, when the bollard is installed, it is raised above the ground. A stop 7 and lugs 8 stop the body 6 from sliding too far and damaging either the base 4 of the outer sleeve 2 or a top guide sleeve 9.
A constant force spring unit 10 for example of the type 5 RZ 5 supplied by Tensator Ltd is attached to the outer sleeve 2 at one end and to the body 6 at its other end. The force applied by the spring 10 is such that, when the body 6 is free to move, it is raised by the spring 10.
The required strength of the spring is, of course, dependent upon the weight of the body 6. In certain applications, more than a single spring 10 will be required. For example a bollard 1 having a body 6 that is 8kg, two 5 RZ 5 springs are used. This will particularly be the case where a heavy duty steel body 6 is needed.
Locking means (not shown) may be provided so that the body 6 can be locked in either its raised or retracted positions. It is also envisaged that an electric motor could be provided to retract the body 6 when required.
Such a motor could be used in combination with a locking mechanism to hold the body 6 in its retracted position, and to lock the body 6 when in the raised position.
Claims (6)
1. A bollard comprising: a base, which is arranged to be fixed wholly in the ground, and an elongate body which is arranged to be movable relatively to the base between a retracted position in which it is accommodated wholly within a hole in the ground, and a raised position in which it extends above the ground; and constant force biasing means for biasing the body towards its raised position.
2. A bollard according to claim 1, wherein the constant force biasing means is one or more constant force springs.
3. A bollard according to claims 1 or 2, wherein the bollard is provided with means for locking the body in its retracted and/or raised position.
4. A bollard according to claims 1, 2 or 3, wherein the bollard is provided with an outer sleeve which surrounds the body when retracted.
5. A bollard according to any of claims 1 to 5, wherein the bollard is provided with a raising and/or lowering mechanism.
6. A bollard according to claim 5, wherein the mechanism includes an electric motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9700337A GB2309727B (en) | 1996-02-01 | 1997-01-09 | Bollard |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9602026.8A GB9602026D0 (en) | 1996-02-01 | 1996-02-01 | Bollard |
| GB9700337A GB2309727B (en) | 1996-02-01 | 1997-01-09 | Bollard |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9700337D0 GB9700337D0 (en) | 1997-02-26 |
| GB2309727A true GB2309727A (en) | 1997-08-06 |
| GB2309727B GB2309727B (en) | 1999-05-26 |
Family
ID=26308574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9700337A Expired - Fee Related GB2309727B (en) | 1996-02-01 | 1997-01-09 | Bollard |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2309727B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4577991A (en) * | 1984-11-28 | 1986-03-25 | Rolow Willard J | Deployable vehicular barricade |
| EP0227447A2 (en) * | 1985-12-19 | 1987-07-01 | G.C.J. Greest, Esq. | Parking post |
| GB2214210A (en) * | 1986-03-17 | 1989-08-31 | Harry David Dickinson | Bollard type trafficway barrier |
-
1997
- 1997-01-09 GB GB9700337A patent/GB2309727B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4577991A (en) * | 1984-11-28 | 1986-03-25 | Rolow Willard J | Deployable vehicular barricade |
| EP0227447A2 (en) * | 1985-12-19 | 1987-07-01 | G.C.J. Greest, Esq. | Parking post |
| GB2214210A (en) * | 1986-03-17 | 1989-08-31 | Harry David Dickinson | Bollard type trafficway barrier |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9700337D0 (en) | 1997-02-26 |
| GB2309727B (en) | 1999-05-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20090109 |