US3802135A - Hollow plastic break-away post - Google Patents

Hollow plastic break-away post Download PDF

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Publication number
US3802135A
US3802135A US00175637A US17563771A US3802135A US 3802135 A US3802135 A US 3802135A US 00175637 A US00175637 A US 00175637A US 17563771 A US17563771 A US 17563771A US 3802135 A US3802135 A US 3802135A
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United States
Prior art keywords
post
base
anchoring
shaft
profile
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Expired - Lifetime
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US00175637A
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English (en)
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E Weichenrieder
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Individual
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Individual
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/02—Structures made of specified materials
    • 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
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/604—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings
    • E01F9/608—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings for guiding, warning or controlling traffic, e.g. delineator posts or milestones

Definitions

  • the post base fits into a fixed anchoring socket and is lockable therein in a bayonet-type lock, the base being capable of yielding elastically to permit the locking noses to snap loose for a damage-free break-away of the post 'under impact.
  • the locking noses of the base are reinforced and protected against wear by metallic nose inserts which are imbedded in the plastic material.
  • the fabrication method of the post involves extrusion of the interior stiffening members of the shaft in a cross-sectionally curved shape 'to allow for the solidification shrinkage of these members to take place without distorting the already solidified profile shell.
  • the invention relates to hollow plastic break-away posts and a method for their fabrication, and in particular to hollow plastic break-away street guideposts whose shaft has a closed shell with integral interior reinforci-ng ribs, and which have an anchoring base by which the post can be locked into an anchoring socket in the ground in a bayonet-type lock which releases the post under a strong impact.
  • the post In view of the fact that such a firm lock is required between the post and. the socket, the post must have a high resistance against bending and denting, to avoid kinking of the post under an impact force before the latter is high enough to cause the post to break away from its socket.
  • To try to obtain such a bending and denting resistance by increasing theuwall thickness of the post would involve a concommittant increase in the weight and in the moment of inertia of the'post with the risk that an impacting vehicle could suffer considerable damage. This risk of damage was the very reason why the previously widely used wooden or concrete guideposts were replaced by the much lighter plastic guideposts. r
  • a plastic break-away guidepost which is sufficiently resistant against bending and denting, in order to withstand the horizontal break-away impact force without kinking, and to transmit to the post base and anchoring socket the bending moment at which. the post base will be released from its lock in the socket, while at the same time being of minimal mass, so as to avoid dam- 7 age to the vehicle causing the impact force.
  • the invention proposes to attain the above objectiv by suggesting a plastic break-away guidepost which includes a hollow shell with interior stiffening ribs which extend from sidewall to sidewall across the interior of theshell along the shortest possible lines, whereby the ribs areextruded integrally with the shell wall.
  • a preferred embodiment of the invention suggests an arrangement where a plurality of ribs extend inwardly from the outer shellto a second, interior member in the form of a coaxial tubular profile.
  • the post must have a certain degree of elasticity, which is obtainable by fabricating it from a polyethylene plastic, preferably a polyethylene plastic which is relatively soft.
  • This material has the disadvantage, however, that it wears relatively quickly under the mechanical strain and friction occurring during break-away of the post base from its socket.
  • the lock between the base and the socket is of the bayonet-type, where cam-shaped noses on the base engage matching protrusions in the socket, repeated forcible break-away actions would wear off these noses quickly, thereby severely limiting the longevity of the post.
  • the invention therefore suggeststhat these hollow plastic guideposts which are to be locked into their anchoring socket by means of a bayonet-type lock, and which therefor have a substantially cylindrical base with camshaped noses, preferably include metallic reinforcement inserts for these noses, thus improving the stability of the lock.
  • a further preferred feature suggested by the invention is an arrangement, whereby these .metallic nose insertsare imbedded in the wall material of the post base in an area outside the noses themselves.
  • polyethylene is the most suitable material for applications like breakaway street guide posts, traffic signposts and the like, because it offers a high resistance against bending and denting.
  • extrusion profile includes an inner coaxial hollow profile
  • the latter be likewise extruded with an excess cross-sectional contour length which would compensate for the shrinkage occurring'during solidification.
  • a further difficulty that has to be overcome in the fabrication of the plastic break-away post of the invention is related to the incorporation of the metallic nose inserts. Because of the large difference in the heat expansion coefficients between steel and polyethylene, it is not possible to combine the several nose inserts into a single steel ring which would perhaps be slipped over the post base. Thus, it is necessary to provide an independent metallic insert for each of the cam noses which are arranged around the circumference of the base. As these metal inserts are preferably made of a highstrength steel alloy, such as VZA-steel, for example, it is also not possible to magnetically position them in a mold, so that a different approach for their incorporation becomes necessary, to assure the required accurate positioning of the cam noses relative to the body of the base. A still further objective of the present invention is therefore to provide a novel method of incorporating and accurately positioning the metallic inserts for the cam noses.
  • the invention further suggests that the metallic inserts be mechanically attached to the outer periphery of an annular base core of plastic on which the inserts take their final accurate diametral and angular positions.
  • the hook-shaped wrap-around portions of the inserts which are to protect the noses of the base, protrude radially from the base core, with the noses themselves which is to form the post shaft, thus permitting joining of the two post sections in a butt-welding operation.
  • each insert be provided with a positioning hole which engages a matching positioning ear-on the base core.
  • a still further preferred feature suggests the provision of a reinforcing ring covering the seam by which the post base is joined, the post shaft, the ring, too, being secured by welding.
  • FIG. 1 shows, in an elevational view, with a partial center cross-section along the line II of FIG. 2, the lower portion of a street guidepost embodying the invention
  • FIG. 2 shows, in a cross-section taken along the line IIII of FIG. 1, details of the post base of FIG. 1;
  • FIG. 3a shows, in a side elevation, a metallic nose insert for the post base
  • FIG. 3b shows the insert of FIG. 3a in a front view
  • FIG. 4 shows a center cross-section of the annular core of the post base of FIG. I, a metallic nose insert being shown attached thereto;
  • FIG. 5a shows a cylindrical cross-sectional post profile after solidification and calibration
  • FIG. 5b shows the profile of FIG. 5a immediately following its extrusion
  • FIG. 6a shows a square cross-sectional post profile after solidification and calibration
  • FIG. 6b shows the profile of FIG. 6a immediately following its extrusion
  • FIG. 7a shows a cross-section of a guidepost profile after solidification and calibration
  • FIG. 7b shows the profile of FIG. 7a immediately following its extrusion
  • FIG. 8a shows a cross-section of a guidepost profile similar to that of FIG. 7a
  • FIG. 8b shows the profile of FIG. 8a immediately following its extrusion
  • FIG. 9a shows a cross-section of a cylindrical extrusion profile with an inner coaxial tube, after solidifieationand calibration
  • FIG. 9b shows the profile of FIG. 9a immediately following its extrusion
  • FIG. 10b shows the profile of FIG. 10a immediately following its extrusion.
  • the break-away street guidepost 10 includes a shaft 12 havingta cross-section in thegeneral outline of a triangle with rounded-off corners, and a generally cylindrical post base 14. At a. distance from its lower end 24 the base 14 includes a shoulder 16in the form of a continuous peripheral rim, while the lower end portion 18 of the base has a diameter smaller than that of the shoulder 16..
  • the base 14 On its periphery, the base 14 includes several radially protruding cam-shaped noses This post base 14 is so designed that it can be inserted into a known anchoring socket (not shown) which has the form of a pot with a flat end face around its open upper end, the latter being arranged to support the shoulder 16. of the base.
  • the socket On its inner wall, the socket includes several. inwardly protruding cam portions whichcan be engagedfrom below by the cam noses 20 of the post base 14, thereby firmly locking the guidealong theshortest possible lines.
  • These stiffening ribs verse webs which, when the guidepost is subjected to horizontal bending forces, transmit tension stresses from one wall portion to an opposite wall portion so as to give the post a greatly increased moment of resistance against bending.
  • These stiffening ribs 32a and 32b extend through the entire length of the shaft 12 and are also provided in the upper portion of the post base 14. However, they do not extend into the cylindrical portion of the base 14, terminating along the line 320 in
  • the metallic nose inserts 26 are made of alloy steel, preferably V2A steel. As it is not possible for parts made of this kind of steel to be positioned magnetically inside an injection mold, the base section 14 of the invention is produced in two injection molding steps, by starting with a plastic base core 34 (FIG. 4) which is essentially a short piece of cylindrical tubing, including several protruding positioning ears 36 on its outer periphery. Each metallic nose insert 26 consists of a piece post to the anchoring socket. In assembled condition, i
  • the post base 14 and the anchoring socket preferably leave an axial space between the lower end 24 of the base and the bottom of the pot-shaped socket, so that foreign material, such as sand or earth which may have fallen into the socket, does not impede the safe locking of the post 10 to its anchoring socket.
  • a generally horizontal force is applied to the anchored guidepost, it results in a pivotingmoment around the abutment point between theshoulder 16 of the post base and the upper end face of the socket which,at a certain predetermined magnitude, causes the plastic material of the generally cylindrical base 14 to yield elastically inwardly so that the cam noses can snap out, one by one, from under I the socket cam portions, allowing the guidepost 10 to breakaway from its socket without damage to either.
  • the bayonet-type locking arrangement permits simple reinsertion of the post into its socket by way of a rotational locking operation.
  • cam noses 20 in order to withstand the high I stress and potential wear during the break-away action,
  • this welding seam constitutes a weakenedline in terms of the bending 'resistance of the assembled post 10, it is preferably reinforced by an exterior reinforcing ring 30 which itself is also welded to the guidepost 10.
  • the reinforcing ring 30 is weldedin place by only superficially heating the adjacent wall portions of the base 14 and the shaft 12 tothe weldingtemperature, thereby avoiding any negative influence of the welding heat on the resistance of the post profile.
  • the shaft profile includes inter-' of sheet metal which is bent into a generally picturehook-shaped multi-angular outline and includes, in its upper flat portion, an oblong positioning hole 38 matching the size of the positioning ears 36 on the base core 34.
  • Each nose insert 26 further includes on either side of its positioning hole 38 a punched, upended hole 40a and 40b, respectively, whose purpose is to anchor the nose insert inside the plastic wall of the post base 14.
  • the finished base molding includes a peripheral shoul-. der 16, and the base portion abovethe shoulder 16 includes an upper length portion of cross-sectional transition from the cylindrical outline of the base core 34 and shoulder 16 to the triangular cross-section of the shaft 12.
  • the base 14 includes the same internal stiffening ribs 32a and 32b as are provided in the extruded shaft profile 12, so that an abutment joint 28 is formed between the base 14 and the shaft 12 where both sections have the same cross sec- ..tion. This permits convenient joining of the two sections by butt welding.
  • Guideposts produced in this manner have a high longevity and, in spite of their elastic structure, offer adequate stiffness and resistance against denting to withstand break-away impacts.
  • the post structure of the invention is not to be used for street guideposts, it is of course possible to choose between a great variety of different extrusion profiles for the shaft portion of the post. Because of its advantages, in particular its light weight and its capability to break away from its anchoring socket under a sufficiently high impact force, combined with its ease of re-insertion into the socket, the post structure of the invention is not only particularly suitable for a variety of traffic signalization purposes including traffic signposts, for instance, but also for demarcations and fence posts, or for the construction of the obstacles in an equine jumping Ben, for example. These applications are merely mentioned by way of examples and various additional applications of the invention could be thought of.
  • the cross-shaped intersection of the interior stiffening ribs 320 and 3211 can be modified in a variety of ways.
  • a particularly interesting modification consists in replacing the rib intersection 50 by a longitudinal, coaxial tubular profile, whereby the stiffening ribs no longer intersect one another, but merely link the two walls of the outer shell and inner tube on their shortest distances, thus providing the desired stiffness.
  • Such a cross-section is called for, for example, where a street guidepost includes a telescopically extendable sign which, as such, is known the sign, a snow marker, for instance, being inserted into the inner tube profile of the shaft 12, which then serves as a guide for the telescoping sign.
  • FIGS. through show a series of different extruded shaft cross sections which all have interior stiffening ribs, the a-FIGURES showing the final crosssection after solidification and calibration, the b- FIGURES showing the shape of the extrusion die which is also that of theextruded profile before solidification shrinks and straightens the interior members of the extruded profile.
  • numeral 60 indicates in each case the outer shell of the profile, whose periphery 62 is cooled and calibrated in the extrusion operation in a manner described further above.
  • Numeral 64 refers to the intersecting interval stiffening ribs (cf. 32a and 32b of FIG. 2) of FIGS. 5 through 8 which extend between diametrically opposed points on the inner surface 66 of the shell 60. ln the FIGS.
  • the extrusion profile includes a second coaxial tubular profile 68 located in the area of the center of the outer shell 60, with the stiffening ribs 70 extending between opposite points on the inner tubular profile 68 and on the surface 66 of the shell 60.
  • a hollow plastic post for street markers and the like comprising in combination:
  • an elongated hollow post shaft in the form of a continuous profile of plastic material; a post base solidly connected to the lower end of the shaft; and means for anchoring the post base to the ground;
  • the profile of the shaft including a closed outer wall in the form of a shell, and several interior stiffening members integrally connected to the shell, thereby increasing the bending resistance of the shaft profile
  • the post base is likewise of plastic material and hollow, and includes a lower anchoring portion of substantially cylindrical outline and an upper transition portion, by which it is solidly connected to the lower end of the shaft;
  • the anchoring means include a plurality of cam noses nearthe lower end of the anchoring portion of the post base, the cam noses being angularly spaced apart and radially protruding from the outer periphery of the anchoring portion and including each ametallic nose insert;
  • the anchoring means further including a radial shoulder on the anchoring portion at a distance above the cam noses, the shoulder having a radius greater than that of the cam noses
  • the wall of the hollow anchoring portion being adapted to yield radially inwardly to permit the cam noses to successively snap out from under the locking noses of an anchoring socket as described earlier, when a horizontal force is applied to the post shaft which creates a predetermined pivoting moment on the base, thus causing the post to break away from the anchoring socket without damage to either.
  • each nose insert forms a surface portion of the cam nose to protect it against fracture and wear, the nose insert being at least partially imbedded in the wall material of the anchoring portion of the base.
  • each metallic nose insert has the general outline of a hook with a cradle portion, the cradle portion of the hook enveloping the nose on its outer peripheral surface and on at least the two axially-facing sides of the nose, the upper portion of the insert being imbedded and mechanically anchored in the wall material of the anchoring portion of the base at a point above the cam nose.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Road Signs Or Road Markings (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US00175637A 1970-08-27 1971-08-27 Hollow plastic break-away post Expired - Lifetime US3802135A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2042640A DE2042640C3 (de) 1970-08-27 1970-08-27 Pfosten aus Kunststoff, insbesondere Straßenleitpfosten und Verfahren zu seiner Herstellung

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US3802135A true US3802135A (en) 1974-04-09

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US00175637A Expired - Lifetime US3802135A (en) 1970-08-27 1971-08-27 Hollow plastic break-away post

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US (1) US3802135A (es)
JP (1) JPS559482B1 (es)
AR (1) AR194199A1 (es)
AT (1) AT317277B (es)
CA (1) CA951081A (es)
CH (1) CH546862A (es)
DE (1) DE2042640C3 (es)
FR (1) FR2106065A5 (es)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078867A (en) * 1975-12-24 1978-03-14 Grandview Industries, Limited Traffic marker post
US4354772A (en) * 1979-09-19 1982-10-19 Drexler Joannes H Road post or reflector post
WO1992013139A1 (en) * 1991-01-18 1992-08-06 Milton Richard M Impact recovery delineation system
US6099203A (en) * 1998-01-27 2000-08-08 Landes; Scott D. Marker post having a webbed triangular cross section
EP1130167A2 (de) * 2000-03-03 2001-09-05 Lutz Barich Poller
US20050138885A1 (en) * 2000-12-13 2005-06-30 Rotherroe Kevin C. Unitary metal structural member with internal reinforcement
US20060213134A1 (en) * 2005-03-22 2006-09-28 Grand Haven Plastics, Inc. Break-away post
US20100025651A1 (en) * 2005-01-28 2010-02-04 Platt Robert E Fencing system and post insert for use therewith
US20120121325A1 (en) * 2010-11-15 2012-05-17 Buehler Michael J Crash cushion

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2466569A1 (fr) * 1979-09-27 1981-04-10 Mach En Metaalfab Poteau routier directionnel ou a reflecteur
DE3000355A1 (de) * 1980-01-07 1981-07-09 Wolfgang K. Ing. Altemöller (grad.), 8011 Baldham Kunststoffhohlprofil
DE3327534A1 (de) * 1983-07-30 1985-02-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur herstellung eines zuenderkoerpers mit mindestens einem in ihn konturbuendig eingebetteten kontaktring
FR2654448A1 (fr) * 1989-11-15 1991-05-17 Allibert Sa Dispositif de signalisation formant notamment balise routiere.
EP1201827A1 (en) 2000-10-23 2002-05-02 Borealis Technology Oy Pole for a road safety barrier
DE10250257B4 (de) * 2001-12-12 2010-05-12 Erich Haimerl Straßenleitpfostenfuß

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2454640A (en) * 1945-06-30 1948-11-23 Trail A Boat Company Mast for marine craft
US3013584A (en) * 1955-03-28 1961-12-19 Gar Wood Ind Inc Supporting members
US3274741A (en) * 1961-05-09 1966-09-27 Edison Soc Assemblable and disassemblable partition
US3307833A (en) * 1963-09-13 1967-03-07 Bertram K G J Safety fence for roads
US3308584A (en) * 1963-05-23 1967-03-14 William G Graham Highway guide post
US3552698A (en) * 1968-06-18 1971-01-05 W F Keegan & Co Inc Break-away coupling for poles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2454640A (en) * 1945-06-30 1948-11-23 Trail A Boat Company Mast for marine craft
US3013584A (en) * 1955-03-28 1961-12-19 Gar Wood Ind Inc Supporting members
US3274741A (en) * 1961-05-09 1966-09-27 Edison Soc Assemblable and disassemblable partition
US3308584A (en) * 1963-05-23 1967-03-14 William G Graham Highway guide post
US3307833A (en) * 1963-09-13 1967-03-07 Bertram K G J Safety fence for roads
US3552698A (en) * 1968-06-18 1971-01-05 W F Keegan & Co Inc Break-away coupling for poles

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078867A (en) * 1975-12-24 1978-03-14 Grandview Industries, Limited Traffic marker post
US4354772A (en) * 1979-09-19 1982-10-19 Drexler Joannes H Road post or reflector post
WO1992013139A1 (en) * 1991-01-18 1992-08-06 Milton Richard M Impact recovery delineation system
US5199814A (en) * 1991-01-18 1993-04-06 Flexco Impact recovery delineation system
US6099203A (en) * 1998-01-27 2000-08-08 Landes; Scott D. Marker post having a webbed triangular cross section
EP1130167A3 (de) * 2000-03-03 2003-10-22 Lutz Barich Poller
EP1130167A2 (de) * 2000-03-03 2001-09-05 Lutz Barich Poller
US20050138885A1 (en) * 2000-12-13 2005-06-30 Rotherroe Kevin C. Unitary metal structural member with internal reinforcement
US7552569B2 (en) * 2000-12-13 2009-06-30 Rotheroe Kevin Chaite Unitary metal structural member with internal reinforcement
US20100025651A1 (en) * 2005-01-28 2010-02-04 Platt Robert E Fencing system and post insert for use therewith
US20060213134A1 (en) * 2005-03-22 2006-09-28 Grand Haven Plastics, Inc. Break-away post
US20120121325A1 (en) * 2010-11-15 2012-05-17 Buehler Michael J Crash cushion
US8974142B2 (en) * 2010-11-15 2015-03-10 Energy Absorption Systems, Inc. Crash cushion
US10006179B2 (en) 2010-11-15 2018-06-26 Energy Absorption Systems, Inc. Crash cushion

Also Published As

Publication number Publication date
JPS559482B1 (es) 1980-03-10
DE2042640C3 (de) 1979-11-29
AT317277B (de) 1974-08-26
DE2042640A1 (de) 1972-03-02
CH546862A (de) 1974-03-15
AR194199A1 (es) 1973-06-29
FR2106065A5 (es) 1972-04-28
CA951081A (en) 1974-07-16
DE2042640B2 (de) 1979-04-05

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