GB2138092A - Sealing screw for threaded through bores - Google Patents

Sealing screw for threaded through bores Download PDF

Info

Publication number
GB2138092A
GB2138092A GB08409132A GB8409132A GB2138092A GB 2138092 A GB2138092 A GB 2138092A GB 08409132 A GB08409132 A GB 08409132A GB 8409132 A GB8409132 A GB 8409132A GB 2138092 A GB2138092 A GB 2138092A
Authority
GB
United Kingdom
Prior art keywords
head
plug
bore
screw
tapped
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
Application number
GB08409132A
Other versions
GB8409132D0 (en
GB2138092B (en
Inventor
Josef Stenzel
Heinz Schwalm
Axel Rauthmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Motor Co
Original Assignee
Ford Motor Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Publication of GB8409132D0 publication Critical patent/GB8409132D0/en
Publication of GB2138092A publication Critical patent/GB2138092A/en
Application granted granted Critical
Publication of GB2138092B publication Critical patent/GB2138092B/en
Expired legal-status Critical Current

Links

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
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/14—Cap nuts; Nut caps or bolt caps
    • 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
    • F16B33/004—Sealing; Insulation
    • 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
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J13/00—Covers or similar closure members for pressure vessels in general

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Bolts, Nuts, And Washers (AREA)

Abstract

In a sealing screw for tapped through bores, a head (5) is provided with a threaded shank (6) and a plug (7) is provided with a tighter threaded portion (8). The head (5) and the plug (7) cooperate by way of drawing surfaces (9 and 10) engaging in the screwing-in direction and releasing in the screwing-out direction. <IMAGE>

Description

SPECIFICATION Locking and sealing screw for threaded through bores The invention relates to a locking and sealing screw for threaded trough bores.
In order to simplify manufacture, it is generally preferred to form bores which are to be threaded as through bores and to cut the thread over the entire length of the bore.
Tapping blind bores is considerably more troublesome on account of the difficulty in removing the swarf.
On the other hand, in the case of many components, care must be taken that any fluid in the component should not be allowed to escape through such a bore and that dirt or a fluid should be not permitted to enter the cavity of the component.
The present invention seeks to provide a screw for engaging in a tapped through bores which enables the bore to be sealed in a simple manner.
According to the present invention, there is provided a screw for engaging in and sealing a tapped through bore, the screw comprising a head having a threaded shank, a separable plug having a threaded portion and coupling means acting to couple the plug for rotation with the head only in the direction of engagement in the bore, whereby the plug may be driven into the bore by screwing in of the head and the plug remains in position upon withdrawal of the head.
The term "screw" is used herein in a broad sense to include a blot, stud or the like device having a screw-threaded shank, and includes a threaded shank fitted with handle to act as a tool for inserting plugs.
Preferably, the coupling means comprise helical coupling surfaces formed on the mating faces of the head and the plug, the surfaces and terminating in coupling teeth.
The invention will now be described further, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a section along the axis of a threaded sleeve having a locking and sealing screw inserted therein, and Figure 2 is a view to an enlarged scale of the locking and sealing screw in Fig. 1.
In Fig. 1 a threaded sleeve 2, which is provided with a tapped through bore 3, is secured to a sheet metal component 1. The locking and sealing screw 4 is shown in this view with a partly cut-away cenral section.
The locking and sealing screw 4 is illustrated Fig. 2 and comprises a head 5 and a plug 7. The head 5 is provided with a first threaded shank 6 and the plug 7 is provided with a tighter sealing threaded portion 8.
Helical tooth coupling surfaces 9 and 10 are formed on the contiguous end faces of the head 5 and the plug 7, respectively.
The head 5 is provided with a central through bore 11 which is in alignment with a central projection 12 on the plug 7. By virtue of such construction, the locking and sealing screw may be produced by die-casting. In this case, the head 5 and the plug 7 are joined together by frangible webs of material which remains from the die-casting. By the application of pressure upon the head 5 and the plug 7, these thin webs of material are broken and the projection or pin 1 2 enters the central bore 11 and with the tight fit provided forms a frictional connection which may be released at any time and which prevents the plug 7 from being lost during the manipulation of the head 5.
When the locking and sealing screw 4 is screwed into a tapped through bore 3, the tighter threaded portion 8 of the plug 7 is also jointly moved by the helical tooth coupling surfaces 9 and 10-which lock in the screwing-in direction-until the head 5 is completely screwed in. The head of the locking and sealing screw may now remain in this position, in order for example to protect a tapped bore only intended for use occasionally against the ingress of dust and dirt.
If the tapped bore is required for securing an additional component, the head is unscrewed and the helical surfaces separate from one another so that the plug 7 remains in its position in the tapped through bore 3.
Should the head 5 be inadvertently left of after removal of a component attached by the screw, the plug 7 nevertheless remains in place to ensure that bore remains sealed against ingress or egress of fluid or dirt.
If desired, the head may be designed with a handle to act as a tool to insert separately formed plugs 7 into tapped through bores in the manner described above, in order to avoid the manufacture of tapped blind bores.
1. A screw for engaging in and sealing a tapped through bore, the screw comprising a head having a threaded shank, a separable plug having a threaded portion and coupling means acting to couple the plug for rotation with the head only in the direction of engagement in the bore, whereby the plug may be driven into the bore by screwing in of the head and the plug remains in position upon withdrawal of the head.
2. A screw as claimed in Claim 1, wherein the coupling means comprise helical coupling surfaces formed on the mating faces of the head and the plug, the surfaces and terminating in coupling teeth.
3. A screw as claimed in claim 1 or 2, wherein the head is formed with an axial bore and the plug is formed with a projection engageable in the later bore.
4. A screw as claimed in claim 3, wherein the head and the plug are formed by die
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Locking and sealing screw for threaded through bores The invention relates to a locking and sealing screw for threaded trough bores. In order to simplify manufacture, it is generally preferred to form bores which are to be threaded as through bores and to cut the thread over the entire length of the bore. Tapping blind bores is considerably more troublesome on account of the difficulty in removing the swarf. On the other hand, in the case of many components, care must be taken that any fluid in the component should not be allowed to escape through such a bore and that dirt or a fluid should be not permitted to enter the cavity of the component. The present invention seeks to provide a screw for engaging in a tapped through bores which enables the bore to be sealed in a simple manner. According to the present invention, there is provided a screw for engaging in and sealing a tapped through bore, the screw comprising a head having a threaded shank, a separable plug having a threaded portion and coupling means acting to couple the plug for rotation with the head only in the direction of engagement in the bore, whereby the plug may be driven into the bore by screwing in of the head and the plug remains in position upon withdrawal of the head. The term "screw" is used herein in a broad sense to include a blot, stud or the like device having a screw-threaded shank, and includes a threaded shank fitted with handle to act as a tool for inserting plugs. Preferably, the coupling means comprise helical coupling surfaces formed on the mating faces of the head and the plug, the surfaces and terminating in coupling teeth. The invention will now be described further, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a section along the axis of a threaded sleeve having a locking and sealing screw inserted therein, and Figure 2 is a view to an enlarged scale of the locking and sealing screw in Fig. 1. In Fig. 1 a threaded sleeve 2, which is provided with a tapped through bore 3, is secured to a sheet metal component 1. The locking and sealing screw 4 is shown in this view with a partly cut-away cenral section. The locking and sealing screw 4 is illustrated Fig. 2 and comprises a head 5 and a plug 7. The head 5 is provided with a first threaded shank 6 and the plug 7 is provided with a tighter sealing threaded portion 8. Helical tooth coupling surfaces 9 and 10 are formed on the contiguous end faces of the head 5 and the plug 7, respectively. The head 5 is provided with a central through bore 11 which is in alignment with a central projection 12 on the plug 7. By virtue of such construction, the locking and sealing screw may be produced by die-casting. In this case, the head 5 and the plug 7 are joined together by frangible webs of material which remains from the die-casting. By the application of pressure upon the head 5 and the plug 7, these thin webs of material are broken and the projection or pin 1 2 enters the central bore 11 and with the tight fit provided forms a frictional connection which may be released at any time and which prevents the plug 7 from being lost during the manipulation of the head 5. When the locking and sealing screw 4 is screwed into a tapped through bore 3, the tighter threaded portion 8 of the plug 7 is also jointly moved by the helical tooth coupling surfaces 9 and 10-which lock in the screwing-in direction-until the head 5 is completely screwed in. The head of the locking and sealing screw may now remain in this position, in order for example to protect a tapped bore only intended for use occasionally against the ingress of dust and dirt. If the tapped bore is required for securing an additional component, the head is unscrewed and the helical surfaces separate from one another so that the plug 7 remains in its position in the tapped through bore 3. Should the head 5 be inadvertently left of after removal of a component attached by the screw, the plug 7 nevertheless remains in place to ensure that bore remains sealed against ingress or egress of fluid or dirt. If desired, the head may be designed with a handle to act as a tool to insert separately formed plugs 7 into tapped through bores in the manner described above, in order to avoid the manufacture of tapped blind bores. CLAIMS
1. A screw for engaging in and sealing a tapped through bore, the screw comprising a head having a threaded shank, a separable plug having a threaded portion and coupling means acting to couple the plug for rotation with the head only in the direction of engagement in the bore, whereby the plug may be driven into the bore by screwing in of the head and the plug remains in position upon withdrawal of the head.
2. A screw as claimed in Claim 1, wherein the coupling means comprise helical coupling surfaces formed on the mating faces of the head and the plug, the surfaces and terminating in coupling teeth.
3. A screw as claimed in claim 1 or 2, wherein the head is formed with an axial bore and the plug is formed with a projection engageable in the later bore.
4. A screw as claimed in claim 3, wherein the head and the plug are formed by die casting and, prior to insertion in the bore, are connected to one another by means of a frangible web.
5. A screw as claimed in any preceding claim, wherein the threaded portion of the plug engages the threaded bore more tightly that the threaded shank of the head.
6. A screw for engaging in and sealing a tapped through bore, constructed substantially as herein described with reference to and as illustrated in the accompanying drawings.
GB08409132A 1983-04-09 1984-04-09 Sealing screw for threaded through bores Expired GB2138092B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833312782 DE3312782C2 (en) 1983-04-09 1983-04-09 Screw for fastening and sealing on through-tapped holes

Publications (3)

Publication Number Publication Date
GB8409132D0 GB8409132D0 (en) 1984-05-16
GB2138092A true GB2138092A (en) 1984-10-17
GB2138092B GB2138092B (en) 1986-11-05

Family

ID=6195836

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08409132A Expired GB2138092B (en) 1983-04-09 1984-04-09 Sealing screw for threaded through bores

Country Status (3)

Country Link
DE (1) DE3312782C2 (en)
FR (1) FR2544029B1 (en)
GB (1) GB2138092B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10303185B4 (en) * 2003-01-27 2009-06-04 Mann + Hummel Gmbh Fluid channel housing assembly, plugs for a fluid channel housing assembly, and internal combustion engine having a fluid channel housing assembly
FR2999668B1 (en) * 2012-12-19 2015-02-13 Thales Sa SEALING VALVE FOR FIXING SYSTEM
DE102017201825A1 (en) 2017-02-06 2018-08-09 Mahle International Gmbh Drain plug for sealing a recess and screw arrangement for tight screwing

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB501548A (en) * 1937-09-03 1939-03-01 Granville Bradshaw Improvements in or relating to screws
GB535346A (en) * 1939-10-03 1941-04-07 Herbert Ellis Mair Improvements in or relating to binding posts
GB1223900A (en) * 1968-07-31 1971-03-03 Gkn Screws Fasteners Ltd Improvements in or relating to tamperproof screws
GB1479971A (en) * 1975-01-15 1977-07-13 Kirby J Methods of aligning a bore formed in a first object with a through bore formed in a second object
GB2000241A (en) * 1977-06-09 1979-01-04 Illinois Tool Works Threaded fasteners, and tools for use therewith
GB1557234A (en) * 1978-03-01 1979-12-05 Bicc Ltd Threaded elements
EP0066841A2 (en) * 1981-06-10 1982-12-15 STEIN INDUSTRIE Société anonyme dite: Access opening plug for a radiographic control source in a pipe or apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191201563A (en) * 1912-01-19 1912-08-01 Maurice Steinman Improvements in and relating to Screws.
DE904013C (en) * 1951-09-21 1954-02-15 Hermann Friedrich Albrecht Dip Fuse for screw connections
FR1424148A (en) * 1965-02-02 1966-01-07 Screw or threaded rod tamper-proof and non-removable
DE1976863U (en) * 1967-10-31 1968-01-11 Josef Wilhelm LOCKING SCREW.
US3651385A (en) * 1968-09-18 1972-03-21 Sony Corp Semiconductor device including a polycrystalline diode
JPS5416063A (en) * 1977-06-09 1979-02-06 Illinois Tool Works Insertable bolt and driving attach ment therefore
LU80698A1 (en) * 1978-12-22 1980-07-21 Karcher Schraubenwerke Gmbh MECHANICAL FASTENERS AND RELATED FASTENING TOOL
DE7901702U1 (en) * 1979-01-23 1979-11-08 Tabry, Mario, 7000 Stuttgart Screw head

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB501548A (en) * 1937-09-03 1939-03-01 Granville Bradshaw Improvements in or relating to screws
GB535346A (en) * 1939-10-03 1941-04-07 Herbert Ellis Mair Improvements in or relating to binding posts
GB1223900A (en) * 1968-07-31 1971-03-03 Gkn Screws Fasteners Ltd Improvements in or relating to tamperproof screws
GB1479971A (en) * 1975-01-15 1977-07-13 Kirby J Methods of aligning a bore formed in a first object with a through bore formed in a second object
GB2000241A (en) * 1977-06-09 1979-01-04 Illinois Tool Works Threaded fasteners, and tools for use therewith
GB1557234A (en) * 1978-03-01 1979-12-05 Bicc Ltd Threaded elements
EP0066841A2 (en) * 1981-06-10 1982-12-15 STEIN INDUSTRIE Société anonyme dite: Access opening plug for a radiographic control source in a pipe or apparatus

Also Published As

Publication number Publication date
FR2544029B1 (en) 1989-02-03
DE3312782C2 (en) 1986-07-17
DE3312782A1 (en) 1984-10-18
GB8409132D0 (en) 1984-05-16
GB2138092B (en) 1986-11-05
FR2544029A1 (en) 1984-10-12

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee