US20120187127A1 - Threaded plastic plug for forced screwing - Google Patents
Threaded plastic plug for forced screwing Download PDFInfo
- Publication number
- US20120187127A1 US20120187127A1 US13/356,373 US201213356373A US2012187127A1 US 20120187127 A1 US20120187127 A1 US 20120187127A1 US 201213356373 A US201213356373 A US 201213356373A US 2012187127 A1 US2012187127 A1 US 2012187127A1
- Authority
- US
- United States
- Prior art keywords
- plug
- head
- flange
- cavity
- thread
- 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.)
- Abandoned
Links
- 239000007787 solid Substances 0.000 claims abstract description 17
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/006—Non-metallic fasteners using screw-thread
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
- B65D39/08—Threaded or like closure members secured by rotation; Bushes therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
- B65D39/08—Threaded or like closure members secured by rotation; Bushes therefor
- B65D39/082—Bung-rings and bungs for bung-holes
- B65D39/088—Bungs with special means facilitating handling thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D59/00—Plugs, sleeves, caps, or like rigid or semi-rigid elements for protecting parts of articles or for bundling articles, e.g. protectors for screw-threads, end caps for tubes or for bundling rod-shaped articles
- B65D59/02—Plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
- F16B35/044—Specially-shaped ends
- F16B35/047—Specially-shaped ends for preventing cross-threading, i.e. preventing skewing of bolt and nut
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/04—Filling or draining lubricant of or from machines or engines
- F01M11/0408—Sump drainage devices, e.g. valves, plugs
- F01M2011/0416—Plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
- F16B23/0015—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool substantially rectangular, e.g. one-slot head
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
- F16B23/0038—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool substantially prismatic with up to six edges, e.g. triangular, square, pentagonal, Allen-type cross-sections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0092—Specially shaped nuts or heads of bolts or screws for rotations by a tool with a head engageable by two or more different tools
Definitions
- This invention relates to a threaded plastic plug for forced and facilitated screwing.
- plugs made of plastic material, intended for industrial use, designed to be inserted with forced screwing and tightening in a hole of a generic recipient unit.
- Such plugs are used for the most diverse purposes, including, for example, blocking holes, protecting them from any damage, covering them for functional or aesthetic reasons, making them airtight or watertight, marking them, hermetically sealing them, etc.
- a prior art type of such plugs has an overall single-piece structure, having a longitudinal axis of symmetry. It basically has three identifiable fundamental parts: a body, a flange and a head, parts which are positioned one after another longitudinally relative to the axis of symmetry.
- the plug body is substantially cylindrical, hollow inside, and has a profile wall in which an outer thread is made, this thread being designed to couple with a matching thread made in the hole which will receive the plug.
- the flange is basically ring-shaped, and is interposed between the body and the head. It projects transversally to the axis of the plug relative to both the body and the head.
- the flange is designed to make contact with a section of the surface of the unit surrounding the hole, applying a thrust action on it as a result of screwing, the thrust action being more intense the higher the tightening torque used for forced screwing of the plug into the hole.
- the head has the shape of a tubular solid with a prismatic profile, extending over a short axial length, projecting from the opposite side of the flange to that from which the body projects.
- the tubular solid has a large inner cavity which, laterally, is surrounded by a thick wall, having the shape of a closed ring and with even, constant thickness.
- the inner cavity also has a closed end, formed by the flange.
- a large opening located at the top of the tubular solid allows access from outside to the inner cavity of the plug head.
- the head has various types of coupling surfaces on which to engage an operating tool for forced screwing or unscrewing of the plug.
- first coupling surfaces are on the faces of the outer surface of the ring-shaped wall of the tubular solid; second coupling surfaces are in contrast provided by prominent protrusions contained in the cavity.
- first outer surfaces are substantially at right angles to the plane in which the flange lies and are shaped and sized in such a way that they can be coupled with an operating tool consisting for example of a standardised, standard-production open-ended wrench or a socket wrench normally used for tightening steel bolts.
- the second coupling surfaces which are in contrast provided by the parallel protrusions inside the cavity, instead together delimit an interposed slot or slit in which a further type of operating tool may be engaged, again of the standardised type for generic usage, in that case represented by a screwdriver which can engage in the slot so as to apply the force necessary for screwing/unscrewing the plug.
- the plug is normally made of plastic material.
- the operating tools of the standard type are in contrast made of high-strength steel and are sized in such a way that they can apply tightening torques whose intensity is suitable for tightening steel bolts fully home.
- the intensity of the tightening torque must be very carefully modulated so as to always guarantee the correct compromise between plug tightening suitable for the specific functions required of it, and tightening which is not excessive and which is below a limit value which could cause permanent damage to the plug head; damage which is also contributed to by the non-eliminable circumferential play with which the operating tool engages with the first and/or with the second coupling surfaces previously defined.
- the fitter may tend to tighten the plug in a cautious way, less than is necessary to guarantee for example optimum hole airtight or watertight sealing.
- the main aim of the invention is to overcome said disadvantages by providing a plug shaped in such a way that it can receive a tightening torque which may even be very intense, without being subject to permanent deformations which would compromise the functionality of the plug or vice versa the correct nature of any subsequent plug removal operations which might be necessary.
- the head of the plug is shaped in such a way that it has walls surrounding the head cavity which have a thickness that is increased at least close to the flange, as well as being located completely inside the head cavity in such a way as to avoid any limitation on the use of plug operating tools made in the standardised form.
- Another aim of the invention is to allow the automatic and correct engagement of the body thread irrespective of the relative position with which the plug is presented to the receiving thread.
- FIGS. 1 , 2 and 3 are respectively an elevation view, a top plan view and a side view of a plug made according to the invention
- FIG. 4 is a perspective view showing the plug in its entirety
- FIG. 5 is a cross-section of the plug in the plane of the line labelled A-A in FIG. 2 .
- FIGS. 1 , 2 , 3 the numeral 1 denotes in its entirety a threaded plug 1 , intended to be inserted with forced screwing in a hole made in a generic receiving unit, not shown in the accompanying drawings.
- the plug 1 preferably made of plastic material—basically comprises a single-piece structure, having a longitudinal axis 2 of symmetry, and formed by: a body 3 , a flange 4 and a head 5 , which are positioned in an orderly fashion one after another along the axis 2 , with the flange 4 interposed between the body 3 and the head 5 .
- the body 3 [ FIGS.
- the thread 6 is interposed between two smooth cylindrical collars 17 a and 17 b, one 17 a of which is adjacent to the flange 4 , while the other 17 b is made at one end of the body 3 far from the flange 4 .
- the head 5 has the shape of a prismatic tubular solid 8 , with a polygonal profile, which in this particular case is hexagonal.
- the tubular solid 8 extends longitudinally relative to the axis 2 of the plug 1 over a short length, projecting from the flange 4 on the opposite side of the flange to that from which the body 3 projects.
- the tubular solid 8 has an inner cavity 7 which, laterally, is surrounded by a thick wall 9 , having the shape of a closed ring; and which is inferiorly delimited by a closed bottom surface 21 , formed by the flange 4 . At the top of the tubular solid 8 there is an opening 11 allowing access to the inner cavity 7 of the plug head 5 .
- a lateral surface 9 e which is substantially at a right angle to the plane in which the flange 4 lies
- an inner lateral surface 9 i correspondingly polygonal, which is oblique relative to the axis 2 of the cavity 7 , diverging from it in the direction of travel along the axis 2 from the body 3 to the head 5 of the plug 1 .
- the thickness of the wall 9 is variable from a minimum located at the access opening 11 to the head 5 inner cavity 7 , to a maximum which in contrast is located at the zone where the tubular solid 9 is attached to the flange 4 .
- the variation in the thickness is preferably continuous and linear and is fully obtained inside the cavity 7 . In that way, there is a noticeable increase in the strength of the wall 9 of the tubular solid 8 without thereby causing any modification of its outer lateral surface 9 e which may therefore be engaged correctly and without any limitation using operating tools of the standardised and standard type.
- the presence of the cylindrical collar 17 b in the plug 1 means that for correct insertion and initial engagement of the thread 6 in the matching thread of the receiving hole, the fitter does not need to search for the start of the thread. In practice it is sufficient to begin screwing the plug 1 —whatever its condition—in order to make the thread automatically engage correctly, without any action by the fitter, after rotating the plug 1 about its own axis 2 at most through half a round angle.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Pressure Vessels And Lids Thereof (AREA)
- Dowels (AREA)
- Fishing Rods (AREA)
Abstract
A threaded plastic plug (1) comprises a single-piece structure, having a longitudinal axis (2) of symmetry, and comprises a head (5), a body (3) with an outer thread (6) and a cylindrical collar (17b), and a tightening flange (4) interposed between the head (5) and the body (3). The head (5) has the shape of a tubular solid (8) projecting from the flange (4) in a direction parallel with the axis (2) of the plug (1), and comprises an inner cavity (7), accessible from the outside through one end of the solid (8), the cavity (7) being laterally surrounded by a non-circular surface (22) of an annular wall (9). The wall (9) of the tubular solid (8) which surrounds the cavity (7) having a variable thickness, the greater thickness being located close to the flange (4) and entirely facing towards the inside of the cavity (7). [FIG. 1]
Description
- This invention relates to a threaded plastic plug for forced and facilitated screwing.
- In the prior art there are already threaded plugs, made of plastic material, intended for industrial use, designed to be inserted with forced screwing and tightening in a hole of a generic recipient unit. Such plugs are used for the most diverse purposes, including, for example, blocking holes, protecting them from any damage, covering them for functional or aesthetic reasons, making them airtight or watertight, marking them, hermetically sealing them, etc.
- A prior art type of such plugs has an overall single-piece structure, having a longitudinal axis of symmetry. It basically has three identifiable fundamental parts: a body, a flange and a head, parts which are positioned one after another longitudinally relative to the axis of symmetry.
- The plug body is substantially cylindrical, hollow inside, and has a profile wall in which an outer thread is made, this thread being designed to couple with a matching thread made in the hole which will receive the plug.
- The flange is basically ring-shaped, and is interposed between the body and the head. It projects transversally to the axis of the plug relative to both the body and the head. When the plug is used the flange is designed to make contact with a section of the surface of the unit surrounding the hole, applying a thrust action on it as a result of screwing, the thrust action being more intense the higher the tightening torque used for forced screwing of the plug into the hole.
- The head has the shape of a tubular solid with a prismatic profile, extending over a short axial length, projecting from the opposite side of the flange to that from which the body projects.
- The tubular solid has a large inner cavity which, laterally, is surrounded by a thick wall, having the shape of a closed ring and with even, constant thickness. The inner cavity also has a closed end, formed by the flange. A large opening located at the top of the tubular solid allows access from outside to the inner cavity of the plug head.
- In the prior art plugs described above the head has various types of coupling surfaces on which to engage an operating tool for forced screwing or unscrewing of the plug.
- Of said coupling surfaces: first coupling surfaces are on the faces of the outer surface of the ring-shaped wall of the tubular solid; second coupling surfaces are in contrast provided by prominent protrusions contained in the cavity.
- More particularly, the first outer surfaces are substantially at right angles to the plane in which the flange lies and are shaped and sized in such a way that they can be coupled with an operating tool consisting for example of a standardised, standard-production open-ended wrench or a socket wrench normally used for tightening steel bolts.
- The operating tools indicated above—irrespective of their technological production form—always operate by encompassing from the outside the outer surface of the tubular body of the head and couple with that surface with some circumferential play which is always present and cannot be eliminated.
- The second coupling surfaces, which are in contrast provided by the parallel protrusions inside the cavity, instead together delimit an interposed slot or slit in which a further type of operating tool may be engaged, again of the standardised type for generic usage, in that case represented by a screwdriver which can engage in the slot so as to apply the force necessary for screwing/unscrewing the plug.
- As already indicated, the plug is normally made of plastic material. The operating tools of the standard type are in contrast made of high-strength steel and are sized in such a way that they can apply tightening torques whose intensity is suitable for tightening steel bolts fully home. Consequently, due to the high capacity for force which can be generated using these tools, when they are used for fitting/removing plastic plugs, the intensity of the tightening torque must be very carefully modulated so as to always guarantee the correct compromise between plug tightening suitable for the specific functions required of it, and tightening which is not excessive and which is below a limit value which could cause permanent damage to the plug head; damage which is also contributed to by the non-eliminable circumferential play with which the operating tool engages with the first and/or with the second coupling surfaces previously defined.
- In practice, when fitting the plugs it may be the case that in order to stay relatively safe regarding the possibility of damaging the plug, the fitter may tend to tighten the plug in a cautious way, less than is necessary to guarantee for example optimum hole airtight or watertight sealing.
- That may result in subsequent problems which could lead to damage not just to the mechanical unit which receives the plug, but also, indirectly, to the machine or plant to which that unit is operatively linked.
- On the other hand, over-tightening of the plug may cause other, no less serious, problems. In fact, although it is true that a high level of tightening, for example enough to permanently deform the head of the plug, could indirectly provide assurances about the efficiency of the airtight or watertight seal of the plug, it is equally true that if during the operating life of the plug in use it becomes necessary to remove the plug (for example for routine or extraordinary maintenance of the unit or of the parts of the machine which use said unit) any permanent deformation of the plug could even prevent application of the operating wrench, preventing the consequent correct unscrewing and removal. Paradoxically all of that may make routine maintenance work very laborious and expensive, sometimes with the aggravating circumstance that added to such difficulties operating the plug there could be further difficulties operating the tools due to the location of the plug—relative to the unit and/or the plant which uses the plug.
- Another significant problem presented by the use of operating tools suitable for tightening steel bolts, relates to the fact that, again due to their capacity for developing intense tightening torques, when screwing in the plug, if the plug thread has not been correctly engaged in the receiving hole thread, it is quite easy to cause permanent damage to the plastic thread of the plug. If that happens, it could result in defects in the hermetic seal, with potential continual dripping of liquids, with the risk of compromising the reliability of the unit which uses the plug.
- Therefore, when fitting the plugs, it is important to pay proper attention to the initial screwing step, finding the start of the thread and correctly engaging it in the receiving hole.
- In the prior art said operation can be carried out in a relatively short unit time, which however, when multiplied by a large number of products to be assembled in mass-production, is no longer negligible. However, that aspect may also be worsened by the possible, not infrequent low technical skill and sensitivity of the labourers assigned these operations, meaning that a fitting operation which is relatively simple, when not carried out correctly, can actually become critical for the reliability of the machine which receives the plug.
- The main aim of the invention is to overcome said disadvantages by providing a plug shaped in such a way that it can receive a tightening torque which may even be very intense, without being subject to permanent deformations which would compromise the functionality of the plug or vice versa the correct nature of any subsequent plug removal operations which might be necessary.
- In accordance with that aim, the head of the plug is shaped in such a way that it has walls surrounding the head cavity which have a thickness that is increased at least close to the flange, as well as being located completely inside the head cavity in such a way as to avoid any limitation on the use of plug operating tools made in the standardised form. Another aim of the invention is to allow the automatic and correct engagement of the body thread irrespective of the relative position with which the plug is presented to the receiving thread.
- The technical features of this invention, in accordance with the above aims, are clear from the content of the claims herein, in particular claim 1, and from any of the claims directly or indirectly dependent on claim 1.
- The advantages of this invention are more apparent in the detailed description which follows, with reference to the accompanying drawings which illustrate preferred, non-limiting embodiments of the invention, in which:
-
FIGS. 1 , 2 and 3 are respectively an elevation view, a top plan view and a side view of a plug made according to the invention; -
FIG. 4 is a perspective view showing the plug in its entirety; -
FIG. 5 is a cross-section of the plug in the plane of the line labelled A-A inFIG. 2 . - With reference to the accompanying drawings, in
FIGS. 1 , 2, 3 the numeral 1 denotes in its entirety a threaded plug 1, intended to be inserted with forced screwing in a hole made in a generic receiving unit, not shown in the accompanying drawings. The plug 1—preferably made of plastic material—basically comprises a single-piece structure, having a longitudinal axis 2 of symmetry, and formed by: abody 3, aflange 4 and ahead 5, which are positioned in an orderly fashion one after another along the axis 2, with theflange 4 interposed between thebody 3 and thehead 5. The body 3 [FIGS. 4 and 5 ] is hollow inside and, on the outside, has athread 6, which it is assumed will mate with a matching inner thread in the hole in the unit that will receive the plug 1. Thethread 6 is interposed between two smoothcylindrical collars flange 4, while the other 17 b is made at one end of thebody 3 far from theflange 4. - By comparing
FIGS. 2 , 4 and 5 it can be seen that thehead 5 has the shape of a prismatictubular solid 8, with a polygonal profile, which in this particular case is hexagonal. Thetubular solid 8 extends longitudinally relative to the axis 2 of the plug 1 over a short length, projecting from theflange 4 on the opposite side of the flange to that from which thebody 3 projects. - The
tubular solid 8 has aninner cavity 7 which, laterally, is surrounded by a thick wall 9, having the shape of a closed ring; and which is inferiorly delimited by a closedbottom surface 21, formed by theflange 4. At the top of thetubular solid 8 there is anopening 11 allowing access to theinner cavity 7 of theplug head 5. - More particularly, on the outside of the wall 9 of the
tubular solid 8 which surrounds thecavity 7 there is a lateral surface 9 e which is substantially at a right angle to the plane in which theflange 4 lies, and on the inside of the wall there is an innerlateral surface 9 i, correspondingly polygonal, which is oblique relative to the axis 2 of thecavity 7, diverging from it in the direction of travel along the axis 2 from thebody 3 to thehead 5 of the plug 1. - The thickness of the wall 9 is variable from a minimum located at the access opening 11 to the
head 5inner cavity 7, to a maximum which in contrast is located at the zone where the tubular solid 9 is attached to theflange 4. The variation in the thickness is preferably continuous and linear and is fully obtained inside thecavity 7. In that way, there is a noticeable increase in the strength of the wall 9 of the tubular solid 8 without thereby causing any modification of its outer lateral surface 9 e which may therefore be engaged correctly and without any limitation using operating tools of the standardised and standard type. - Returning to the
body 3, it can be seen how the presence of thecylindrical collar 17 b in the plug 1 means that for correct insertion and initial engagement of thethread 6 in the matching thread of the receiving hole, the fitter does not need to search for the start of the thread. In practice it is sufficient to begin screwing the plug 1—whatever its condition—in order to make the thread automatically engage correctly, without any action by the fitter, after rotating the plug 1 about its own axis 2 at most through half a round angle. - Therefore, all of that allows any damage to the plug to be avoided, helping to guarantee its perfect seal and correct tightening, and also helping to reduce both the initial fitting times and the working times required for any subsequent maintenance, with obvious advantages in terms of reducing the related costs of production and/or maintenance.
- The invention described above is susceptible of industrial application and may be modified and adapted in several ways without thereby departing from the scope of the inventive concept. Moreover, all details of the invention may be substituted by technically equivalent elements.
Claims (1)
1) A threaded plastic plug (1) comprising a single-piece structure having a longitudinal axis (2) of symmetry, and comprising a head (5), a body (3) with an outer thread (6), and a tightening flange (4) interposed between the head (5) and the body (3); a structure in which the head (5) has the shape of a tubular solid (8) projecting from the flange (4) in a direction parallel with the axis (2) of the plug (1), and comprising an inner cavity (7), accessible from the outside through one end of the solid (8), the cavity (7) being laterally surrounded by a non-circular surface (22) of an annular wall (9); the wall (9) of the tubular solid (8) which surrounds the cavity (7) having a variable thickness, the greater thickness being located close to the flange (4), the plug (1) being characterised in that the body (3) comprises a smooth cylindrical collar (17 b) preceding the start of the outer thread (6) of the body (3) and designed to allow automatic engagement of the thread irrespective of the relative position with which the plug (1) is presented to the receiving thread.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000001U ITRN20110001U1 (en) | 2011-01-24 | 2011-01-24 | THREADED PLASTIC PLUG FOR FORCED AND FACILITATED SCREWING |
ITRN2011U000001 | 2011-01-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120187127A1 true US20120187127A1 (en) | 2012-07-26 |
Family
ID=43975834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/356,373 Abandoned US20120187127A1 (en) | 2011-01-24 | 2012-01-23 | Threaded plastic plug for forced screwing |
Country Status (6)
Country | Link |
---|---|
US (1) | US20120187127A1 (en) |
EP (1) | EP2479441B1 (en) |
DK (1) | DK2479441T3 (en) |
ES (1) | ES2767263T3 (en) |
IT (1) | ITRN20110001U1 (en) |
PL (1) | PL2479441T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9593792B1 (en) * | 2012-10-10 | 2017-03-14 | Michael E. Yoder | Thread protectors |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012025254A1 (en) | 2012-12-21 | 2014-06-26 | Helmholtz Zentrum München Deutsches Forschungszentrum Für Gesundheit Und Umwelt (Gmbh) | Screw tubes and screw caps for biomaterial |
DE102013015265B4 (en) * | 2013-09-16 | 2020-07-02 | Fass-Frisch Gmbh | Screw plug for containers |
DE102016202692A1 (en) * | 2016-02-22 | 2017-08-24 | Mahle International Gmbh | Closure system for a container |
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US20020162407A1 (en) * | 2001-05-07 | 2002-11-07 | Scott Nightlinger | Oil drainage structure for a combustion engine crank case or the like, and method for oil drainage |
US20040045965A1 (en) * | 2002-09-09 | 2004-03-11 | Dwinell Davis B. | Drum plug and seal |
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US7066062B2 (en) * | 2003-10-24 | 2006-06-27 | Flesher Robert W | Torque-setting, tamper-resistant fastener and method and tool for use with same |
USD545404S1 (en) * | 2005-04-20 | 2007-06-26 | Scott Nightlinger | Screw drain plug |
US20080019795A1 (en) * | 2006-07-18 | 2008-01-24 | Skf Usa Inc. | Composite drain plug |
US20080128206A1 (en) * | 2006-12-05 | 2008-06-05 | Skf Usa Inc. | Drain bolt |
US7425112B2 (en) * | 2003-04-29 | 2008-09-16 | Nowak Jr Edmund A | Tamper resistant screw |
US20090020530A1 (en) * | 2007-07-17 | 2009-01-22 | Baughman Gary M | Plastic plug with overcap |
-
2011
- 2011-01-24 IT IT000001U patent/ITRN20110001U1/en unknown
-
2012
- 2012-01-20 DK DK12000346.2T patent/DK2479441T3/en active
- 2012-01-20 EP EP12000346.2A patent/EP2479441B1/en active Active
- 2012-01-20 PL PL12000346T patent/PL2479441T3/en unknown
- 2012-01-20 ES ES12000346T patent/ES2767263T3/en active Active
- 2012-01-23 US US13/356,373 patent/US20120187127A1/en not_active Abandoned
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US2813450A (en) * | 1954-05-03 | 1957-11-19 | Dzus William | Rotatable fastener having circular toothed tool receiving groove |
US5302068A (en) * | 1990-10-03 | 1994-04-12 | Illinois Tool Works Inc. | Fastener having recessed, non-circular head, and fastener-driving tool |
US5547042A (en) * | 1995-01-23 | 1996-08-20 | Platt; Richard B. | Crank case drain plug structure and method |
US20020162407A1 (en) * | 2001-05-07 | 2002-11-07 | Scott Nightlinger | Oil drainage structure for a combustion engine crank case or the like, and method for oil drainage |
US20040045965A1 (en) * | 2002-09-09 | 2004-03-11 | Dwinell Davis B. | Drum plug and seal |
US7425112B2 (en) * | 2003-04-29 | 2008-09-16 | Nowak Jr Edmund A | Tamper resistant screw |
US7066062B2 (en) * | 2003-10-24 | 2006-06-27 | Flesher Robert W | Torque-setting, tamper-resistant fastener and method and tool for use with same |
US6988432B2 (en) * | 2003-11-06 | 2006-01-24 | Uniscrew Worldwide, Inc. | Multi-tiered-recess screws |
USD545404S1 (en) * | 2005-04-20 | 2007-06-26 | Scott Nightlinger | Screw drain plug |
US20080019795A1 (en) * | 2006-07-18 | 2008-01-24 | Skf Usa Inc. | Composite drain plug |
US20080128206A1 (en) * | 2006-12-05 | 2008-06-05 | Skf Usa Inc. | Drain bolt |
US20090020530A1 (en) * | 2007-07-17 | 2009-01-22 | Baughman Gary M | Plastic plug with overcap |
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US9593792B1 (en) * | 2012-10-10 | 2017-03-14 | Michael E. Yoder | Thread protectors |
Also Published As
Publication number | Publication date |
---|---|
DK2479441T3 (en) | 2020-02-03 |
ES2767263T3 (en) | 2020-06-17 |
EP2479441B1 (en) | 2019-10-23 |
EP2479441A1 (en) | 2012-07-25 |
PL2479441T3 (en) | 2020-04-30 |
ITRN20110001U1 (en) | 2011-04-25 |
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Legal Events
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AS | Assignment |
Owner name: POLYKAP S.R.L., SAN MARINO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LUPPI, DAVIDE;REEL/FRAME:027601/0178 Effective date: 20111220 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |