GB2169677A - An insulating reamer bolt - Google Patents

An insulating reamer bolt Download PDF

Info

Publication number
GB2169677A
GB2169677A GB08500081A GB8500081A GB2169677A GB 2169677 A GB2169677 A GB 2169677A GB 08500081 A GB08500081 A GB 08500081A GB 8500081 A GB8500081 A GB 8500081A GB 2169677 A GB2169677 A GB 2169677A
Authority
GB
United Kingdom
Prior art keywords
bolt
insulating
shank portion
insulating material
reamer
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
GB08500081A
Other versions
GB2169677B (en
GB8500081D0 (en
Inventor
Kazuo Nakajima
Yooichi Ono
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.)
NIHON PILLAR PACKING Co L
Original Assignee
NIHON PILLAR PACKING Co L
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 NIHON PILLAR PACKING Co L filed Critical NIHON PILLAR PACKING Co L
Priority to GB8500081A priority Critical patent/GB2169677B/en
Publication of GB8500081D0 publication Critical patent/GB8500081D0/en
Publication of GB2169677A publication Critical patent/GB2169677A/en
Application granted granted Critical
Publication of GB2169677B publication Critical patent/GB2169677B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/06—Steering by rudders
    • B63H25/08—Steering gear
    • B63H25/14—Steering gear power assisted; power driven, i.e. using steering engine
    • B63H25/34—Transmitting of movement of engine to rudder, e.g. using quadrants, brakes
    • 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
    • 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
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
    • F16D1/033—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like by clamping together two faces perpendicular to the axis of rotation, e.g. with bolted flanges

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

An insulating reamer bolt (1) capable of accurately coupling together a vessel propellor shaft and a drive shaft includes an intermediate shank portion (4). The shank portion (4) is sheathed in an insulating material (5) over its entire length to electrically insulate the propellor and drive shafts from each other. <IMAGE>

Description

SPECIFICATION An insulating reamer bolt The present invention relates to improvements in insulating reamer bolts for coupling together a propellor or driven shaft and a drive shaft of a vessel.
As a general rule, insulating reamer bolts for coupling these two shafts with one another play the most important roles of coupling means. Thus, in order to play these roles, the bolts must possess optimum strength, precision and insulating properties in such a way that they can tightly and integrally interconnect the flange surface areas of the opposed ends of a vessel propellor shaft and a drive shaft.
The reason why the above-mentioned reamer bolt must possess optimum insulating properties is because when any small electric potential is generated in closing electric circuits that are generally provided inside a vessel, it is necessary to break these circuits so as to prevent consequential erosion of bearing portions of both the propellor shaft and drive shaft, due to discharge of electricity.
In most conventional insulating reamer bolts for coupling means, a shank or shaft portion of an average size bolt is covered with a quantity of insulating material corresponding to the depth of a flange to be coupled thereby.
In other words, this shank portion is usually provided with the minimum amount of insulation necessary exclusively for insulating purpose. Therefore, when the insulating bolts thus formed are forced into, or out of, bores in a flange, the outer peripheral metal portions of the insulating bolts that are not covered with the insulating material are brought into direct contact with the inner peripheral metal portions of said bores.
In this case a high degree of frictional resistance occurs between both the outer periph eral metal portions and the inner peripheral metal portions when the bolts are being forced into, or out of, said bores, resulting in the inner and outer peripheral metal portions being seriously damaged. This gives rise to a lowering in the coupling precision and burning phenomena that otherwise might inevitably take place, especially with the ingress of foreign matter.
Accordingly, the present invention has been made to mitigate or substantially eliminate the above-mentioned drawbacks and disadvantages, and has as an object to provide an insulating reamer bolt which is capable of causing neither lowering of the coupling precision nor burning phenomena, even when the bolt is forced into, or out of, a coupling portion.
According to the present invention, an insulating bolt such as an insulating reamer bolt includes a shank or shaft portion adapted to insulate and precisely connect a coupling portion, said shank portion being covered, throughout substantially the entire length of its outer periphery, with an insulating material having a small friction efficiency. In one embodiment, a reamer shank portion is contactable with the inner peripheral surface of a coupling portion and is covered throughout substantially its full length with an insulating material having a small friction efficiency. Thus the bolt can be screwably mounted or dismounted in peripheral direction with the least friction efficiency.As a result, no or minimal damage is caused either to the insulating reamer bolts or the bores into which said bolts are screwably mounted or dismounted, and there is the additional advantage that the coupling portion is of high precision.
In order that the invention may be more readily understood, various embodiments thereof will now be described with reference to the accompanying drawings, in which: Figure 1 is a partially sectioned longitudinal elevation of an insulating reamer bolt embodying the invention; Figure 2 is a front elevation showing how an insulating reamer bolt embodying the invention is used in practice; Figure 3 is a partially sectioned longitudinal elevation showing another embodiment of the invention; and Figures 4 to 6 are likewise partially sectioned longitudinal elevations showing, respectively, the application of reamer bolts embodying the invention to a variety of couplings.
In the accompanying drawings showing an insulating reamer bolt for coupling means embodying the present invention, and in particular in Figure 1, numeral 1 designates a largediameter reamer bolt that is adapted to be used in couplings for a propellor or driven shaft of a vessel.
The reamer bolt 1 comprises a shank having a bolt head 2 at one end and a male screw threaded portion 3 at the other end, and an insulating material 5 covering a reamer bolt portion 4 substantially midway thereof. Normally, the thicker the covering of the insulating material 5, the more the absolute value of its resistance is enhanced on the one hand, but on the other hand the mechanical strength of the insulating material 5 is liable to be reduced. Therefore, it is preferable to select the thickness of the insulating material within the range of 0.7 to 1.Omm at the most. preferably, the above-mentioned insulating material 5 is a polyvinyldene fluoride resin (PVDF) which has hard, appropriately flexible, anti-corrosive and anti-erosive properties.Said resin (PVDF) is applied in a molten state and is integrally adhered to the reamer bolt portion 4, for instance, by immersing the latter in said resin until the resin is thickened to a pre-determined degree.
By means of the insulating reamer bolt 1 formed as previously referred to, a flange 7a and a flange 7b of a bolted shaft coupling means 6 of a coupling shown in Figure 2 of the drawings are completely electrically insulated with respect to one another1 since one of said flanges 7a and 7b has its inner and outer ends insulated from one another by means of an insulating washer 8 and an insulating partition 9 while bores 10 in said flanges 7a and 7b are insulated by means of the sheath or covering of insulating material 5 on the insulating bolt 1.
In case the bolt shaft coupling means 6 are either coupled or separated as occasion demands, a number of insulating reamer bolts 1 corresponding to the number of individual bolted shaft coupling means 6 of the coupling can be easily coupled or separated, since said bolts 1 are covered over the entire length of their portions 4 with the insulating material 5 which has a small friction efficiency, i.e. a low coefficient of friction, thus achieving smooth coupling and separating operations. In the drawings, numeral 2a shows a metal washer, and 3a denotes a nut.
In Figure 3 is shown another embodiment of the invention, wherein numeral 11 designates an insulating reamer bolt having a stepped or notched shank portion 4' which includes a small-diameter portion 4a adjacent the bolt head 2, and a large-diameter portion 4b between the portion 4a and the male screwthreaded portion 3.
In this embodiment of the invention, the stepped shank portion 4' is covered with an insulating material 5 which is thick in its smalldiameter portion 4a, but thin in its large-diameter portion 4b, so that the external diameter of the sheathed shank portion is constant throughout its entire length.
Incidentally, the relatively thickly covered area on the small-diameter portion 4a of the bolt adjacent the head 2 is adapted to effectively enhance the absolute resistance value of the insulating material 5, and is longer, in the longitudinal direction of the bolt, than the width or thickness of said flange 7a under normal conditions. The large-diameter portion 4b of the reamer shank portion 4' is thinly covered so as to control the lowering of voltage. However, if said portion 4b is formed thin to an extreme degree, there is a risk of pinholes occurring when the covering or coating operation is carried out, so that the insulating covering on said portion 4b is preferably formed thicker than 0.2mm at least.The insulating material used may be polyvinyldene fluoride resin (PVDF), the coating or sheath being formed by immersing the bolt in the resin until the resin is thickened to a pre-determined degree as has been referred to in connection with the foregoing embodiment.
In Figure 4 is shown another embodiment of the invention wherein either the reamer bolt 1 or 11 is applied to a flexible coupling means 46. In this case a pair of soft, hollow disk packs 42 are unilaterally coupled in correspondence to each other thereby decreasing the difference in diametral direction of each coupling means.
In Figure 5 is shown a further embodiment of the invention wherein an insulating reamer bolt 11 is applied to a coupling means 56 for rigidly fixing each flange, and in Figure 6 is shown reamer bolts 1 or 11 applied to a gear-shaped shaft coupling means 66.
It will be understood, therefore, that when the insulating reamer bolt means 1 embodying the present invention is applied to the abovementioned coupling means 46, 56 or 66, the same effective operations can be secured as in the case with the coupling means 6.

Claims (11)

1. An insulating bolt such as an insulating reamer bolt for precisely interconnecting coupling portions of a shaft coupling arrangement, including a shank portion which, in use of the bolt, is insulated from both coupling portions.
2. An insulating reamer bolt adapted to precisely interconnect opposed coupling portions of a shaft coupling arrangement without providing an electrical connection between the coupling portions, the bolt including a shank portion which is covered throughout substantially the entire length of its outer periphery with an electrically insulating material.
3. A bolt as claimed in claim 1 or 2, wherein the shank portion is covered with an insulating material possessing a low coefficient of friction.
4. A bolt as claimed in claim 1, 2 or 3, wherein the bolt includes a head at or adjacent one end of the shank portion and a male threaded portion at or adjacent the opposite end of the shank portion, and wherein the region of the shank portion nearer the head has an outer diameter which is less than that of the region nearer the threaded portion, said regions being provided with a covering of insulating material of substantially constant external diameter whereby the covering is thicker in the region nearer the head than in the region nearer the threaded portion.
5. A bolt as claimed in any preceding claim, wherein the length of the covering of insulating material is equal to or greater than the combined thickness of the zones of the coupling portions of the shaft coupling arrangement through which the shank portion is intended to pass.
6. A bolt as claimed in claim 4, in combination with claim 5, wherein the length of the region of the shank portion nearer the head, and therefore the length of the overlying relatively thick insulating covering, is greater than the thickness of said zone of the coupling portion which is intended to be disposed adjacent the head.
7. A bolt as claimed in any preceding claim, wherein the insulating material is or includes polyvinyldene fluoride resin.
8. An insulating reamer bolt substantially as herein before described with reference to Figure 1 of the accompanying drawings.
9. An insulating reamer bolt substantially as hereinbefore described with reference to Figure 3 of the accompanying drawings.
10. A shaft coupling arrangement incorporating one or more bolts as claimed in any preceding claim.
11. A shaft coupling arrangement substantially as hereinbefore described with reference to Figure 2, or Figure 4, or Figure 5, or Figure 6 of the accompanying drawings.
GB8500081A 1985-01-03 1985-01-03 Insulating coupling bolts and coupling arrangements incorporating same Expired GB2169677B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8500081A GB2169677B (en) 1985-01-03 1985-01-03 Insulating coupling bolts and coupling arrangements incorporating same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8500081A GB2169677B (en) 1985-01-03 1985-01-03 Insulating coupling bolts and coupling arrangements incorporating same

Publications (3)

Publication Number Publication Date
GB8500081D0 GB8500081D0 (en) 1985-02-13
GB2169677A true GB2169677A (en) 1986-07-16
GB2169677B GB2169677B (en) 1989-08-23

Family

ID=10572350

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8500081A Expired GB2169677B (en) 1985-01-03 1985-01-03 Insulating coupling bolts and coupling arrangements incorporating same

Country Status (1)

Country Link
GB (1) GB2169677B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995015282A1 (en) * 1993-12-03 1995-06-08 Ab Volvo Penta Drive unit for boats
GB2299847A (en) * 1993-02-03 1996-10-16 Hugh Michael Oppen Pratt Load insulator unit comprising a clock and display means that outputs a warning signal
DE19824068A1 (en) * 1998-05-29 1999-12-16 Webasto Karosseriesysteme Electrically insulating screw connection to join two workpieces, e.g. for fixing electric drive to frame of vehicle sunroof
FR2931911A1 (en) * 2008-05-29 2009-12-04 Snecma SYSTEM AND METHOD FOR BRIDGE ASSEMBLY BETWEEN TWO ROTATING PARTS
CN115487706A (en) * 2021-06-17 2022-12-20 中国石油化工股份有限公司 Stirrer electric insulation structure, stirrer and LDPE polymeric kettle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB640478A (en) * 1947-12-17 1950-07-19 Benjamin George Forman Improvements in and relating to non-conductive fastening devices
GB924836A (en) * 1960-09-23 1963-05-01 Asea Ab Method of manufacturing glass fibre-reinforced synthetic resin bolts provided with screw-threads
GB1020090A (en) * 1964-01-08 1966-02-16 Licentia Gmbh Improvements in bolts and the like of synthetic plastics material reinforced with glass fibre
GB1163037A (en) * 1967-07-27 1969-09-04 Ass Elect Ind Dynamo-Electrical Stator Core Mounting.
GB1166988A (en) * 1967-06-28 1969-10-15 Standard Pressed Steel Co Sealing Fasteners
GB1428909A (en) * 1973-11-16 1976-03-24 Micafil Ag Screw-threaded rod of laminated plastics material
GB2006907A (en) * 1977-10-28 1979-05-10 Messerschmitt Boelkow Blohm Connection device proncipally for sheet metal components of light metal alloys

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB640478A (en) * 1947-12-17 1950-07-19 Benjamin George Forman Improvements in and relating to non-conductive fastening devices
GB924836A (en) * 1960-09-23 1963-05-01 Asea Ab Method of manufacturing glass fibre-reinforced synthetic resin bolts provided with screw-threads
GB1020090A (en) * 1964-01-08 1966-02-16 Licentia Gmbh Improvements in bolts and the like of synthetic plastics material reinforced with glass fibre
GB1166988A (en) * 1967-06-28 1969-10-15 Standard Pressed Steel Co Sealing Fasteners
GB1163037A (en) * 1967-07-27 1969-09-04 Ass Elect Ind Dynamo-Electrical Stator Core Mounting.
GB1428909A (en) * 1973-11-16 1976-03-24 Micafil Ag Screw-threaded rod of laminated plastics material
GB2006907A (en) * 1977-10-28 1979-05-10 Messerschmitt Boelkow Blohm Connection device proncipally for sheet metal components of light metal alloys

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2299847A (en) * 1993-02-03 1996-10-16 Hugh Michael Oppen Pratt Load insulator unit comprising a clock and display means that outputs a warning signal
GB2299848A (en) * 1993-02-03 1996-10-16 Hugh Michael Oppen Pratt Load insulator unit comprising measuring means that measures the resistance of an insulating insert
GB2299848B (en) * 1993-02-03 1997-06-04 Hugh Michael Oppen Pratt Load insulator
GB2299847B (en) * 1993-02-03 1997-06-04 Hugh Michael Oppen Pratt Load insulator
WO1995015282A1 (en) * 1993-12-03 1995-06-08 Ab Volvo Penta Drive unit for boats
US5735718A (en) * 1993-12-03 1998-04-07 Ab Volvo Penta Drive unit for boats
DE19824068A1 (en) * 1998-05-29 1999-12-16 Webasto Karosseriesysteme Electrically insulating screw connection to join two workpieces, e.g. for fixing electric drive to frame of vehicle sunroof
FR2931911A1 (en) * 2008-05-29 2009-12-04 Snecma SYSTEM AND METHOD FOR BRIDGE ASSEMBLY BETWEEN TWO ROTATING PARTS
CN115487706A (en) * 2021-06-17 2022-12-20 中国石油化工股份有限公司 Stirrer electric insulation structure, stirrer and LDPE polymeric kettle
CN115487706B (en) * 2021-06-17 2024-04-26 中国石油化工股份有限公司 Stirrer electric insulation structure, stirrer and LDPE (Low-Density polyethylene) polymerization kettle

Also Published As

Publication number Publication date
GB2169677B (en) 1989-08-23
GB8500081D0 (en) 1985-02-13

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Legal Events

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

Effective date: 20000103