GB2164715A - Preventing twisting of threaded fastener shanks - Google Patents

Preventing twisting of threaded fastener shanks Download PDF

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Publication number
GB2164715A
GB2164715A GB08423556A GB8423556A GB2164715A GB 2164715 A GB2164715 A GB 2164715A GB 08423556 A GB08423556 A GB 08423556A GB 8423556 A GB8423556 A GB 8423556A GB 2164715 A GB2164715 A GB 2164715A
Authority
GB
United Kingdom
Prior art keywords
washer
shank
workpiece
fastener
bolt
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
GB08423556A
Other versions
GB2164715B (en
GB8423556D0 (en
Inventor
Emil Almor
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
Priority to GB08423556A priority Critical patent/GB2164715B/en
Publication of GB8423556D0 publication Critical patent/GB8423556D0/en
Publication of GB2164715A publication Critical patent/GB2164715A/en
Application granted granted Critical
Publication of GB2164715B publication Critical patent/GB2164715B/en
Expired legal-status Critical Current

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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
    • F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
    • 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

Abstract

A threaded fastener has a splined shank portion 12 and a splined washer 16 which fits over the shank portion 12 and which engages with the shank portion 12 so as to be able to slide along the shank portion 12 but to be unable to turn relative to the shank portion 12. The face of the washer 16 which will be in contact with the workpiece is provided with serrations 22 so that it grips the face of the workpieces and prevents the washer 16 turning relative to the workpiece. The splined engagement between the washer 16 and the shank portion 10 then prevents the shank portion 12 turning relative to the workpiece as the nut 18 is being tightened, and the shank 10 of the fastener is thus prevented from twisting. <IMAGE>

Description

SPECIFICATION Threaded fastener This invention relates to a threaded fastener such as a bolt which can be used for holding together two workpieces.
When a bolt is used to hold two workpieces together, tightening a nut on the bolt puts the bolt shank into tension and introduces compression into the surrounding workpieces. The act of rotating the nut produces this tension, but also, as a result of friction in the thread between the nut and the bolt on the one hand, and between the bolt head and the workpiece on the other hand, produces a twisting of the bolt. This is undesirable because it means that the bolt shank has to be capable of coping with the twisting loads.
According to the present invention, there is provided a threaded fastener having a shank, a threaded region at one end of the shank, a nut to be screwed onto the threaded region and a washer, the washer being adapted to form a connection between a workpiece in which the fastener is used and the said one end of the shank, the connection being such as to prevent relative rotational movement between the workpiece and said one end of the shank while permitting axial movement of the shank relative to the washer.
The invention is particularly useful when long bolts are being tightened, for example bolts extending from top to bottom of an engine block. The invention does however have application to othe threaded fasteners.
The washer preferably has a face which, in use, will be in contact with the workpiece and which has serrations or other formations on its surface which will bite into the workpiece to prevent the washer rotating relative to the workpiece. The internal circumference of the washer may have splines which mate with splines on the fastener shank to prevent relative rotational movement while permitting relative axial movement.
With this fastener, the twisting loads applied to the shank on tightening the nut are transferred through the washer to the workpiece, so that the shank itself is not subjected to any twisting. As a result, the shank can be made smaller or of lower grade material than would have been necessary if the shank had had to cope with twisting loads.
The washer may have a collar formed on its inner circumference, with the internal surface of the collar carrying the splines.
The outside of the collar may be provided with a formation, preferably tapered, which grips inside a counterbore in the workpiece and helps to stop the washer turning relative to the workpiece.
The invention will now be further described, by way of example, with reference to the accompanying drawing, which is an exploded view of a fastener in accordance with the invention.
The fastener has a shank 10 which has a head 5 at the opposite end. The head 5 shown is circular and has no means by which it can be gripped by a spanner or a wrench.
Because of the design of the washer and of the other end of the bolt, it will not be necessary to grip the head, because the torsional forces generated on tightening the nut are taken up between the washer, workpiece and bolt at the lower end of the bolt. A conventional hexagon bolt head can therefore be omitted.
The shank has a splined portion 12 and a threaded portion 14. A washer 16 and a nut 18 are provided.
The washer has a washer disc 20 with raised serrations 22 on its upper surface and a collar 24 with internal splines 26. The washer fits over the end of the shank 10 with the splines 26 engaging on the splined portion 12.
In use, the bolt is passed through bores in the workpieces which are to be held together.
The washer is placed over the end of the bolt and the nut is screwed on. The washer then pulls up against the workpiece and the serrations 22 bite in to the workpiece surface. Further tightening of the nut puts the shank 10 into tension and pulls the end of the shank through the washer. Because the washer cannot rotate, the shank only moves relative to the washer by sliding through the splines.
1. A threaded fastener having a shank, a threaded region at one end of the shank, a nut to be screwed onto the threaded region and a washer, the washer being adapted to form a connection between a workpiece in which the fastener is used and the said one end of the shank, the connection being such as to prevent relative rotational movement between the workpiece and said one end of the shank while permitting axial movement of the shank relative to the washer.
2. A fastener as claimed in Claim 1, wherein the washer has a face which, in use, will be in contact with the workpiece and which has serrations or other formations on its surface which will bite into the workpiece to prevent the washer rotating relative to the workpiece.
3. A fastener as claimed in Claim 1 or Claim 2, wherein the internal circumference of the washer has splines which mate with splines on the fastener shank to prevent relative rotational movement while permitting relative axial movement.
4. A fastener as claimed in Claim 3, wherein the washer has a collar formed on its inner circumference, with the internal surface of the collar carrying the splines.
5. A fastener as claimed in Claim 4,
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Threaded fastener This invention relates to a threaded fastener such as a bolt which can be used for holding together two workpieces. When a bolt is used to hold two workpieces together, tightening a nut on the bolt puts the bolt shank into tension and introduces compression into the surrounding workpieces. The act of rotating the nut produces this tension, but also, as a result of friction in the thread between the nut and the bolt on the one hand, and between the bolt head and the workpiece on the other hand, produces a twisting of the bolt. This is undesirable because it means that the bolt shank has to be capable of coping with the twisting loads. According to the present invention, there is provided a threaded fastener having a shank, a threaded region at one end of the shank, a nut to be screwed onto the threaded region and a washer, the washer being adapted to form a connection between a workpiece in which the fastener is used and the said one end of the shank, the connection being such as to prevent relative rotational movement between the workpiece and said one end of the shank while permitting axial movement of the shank relative to the washer. The invention is particularly useful when long bolts are being tightened, for example bolts extending from top to bottom of an engine block. The invention does however have application to othe threaded fasteners. The washer preferably has a face which, in use, will be in contact with the workpiece and which has serrations or other formations on its surface which will bite into the workpiece to prevent the washer rotating relative to the workpiece. The internal circumference of the washer may have splines which mate with splines on the fastener shank to prevent relative rotational movement while permitting relative axial movement. With this fastener, the twisting loads applied to the shank on tightening the nut are transferred through the washer to the workpiece, so that the shank itself is not subjected to any twisting. As a result, the shank can be made smaller or of lower grade material than would have been necessary if the shank had had to cope with twisting loads. The washer may have a collar formed on its inner circumference, with the internal surface of the collar carrying the splines. The outside of the collar may be provided with a formation, preferably tapered, which grips inside a counterbore in the workpiece and helps to stop the washer turning relative to the workpiece. The invention will now be further described, by way of example, with reference to the accompanying drawing, which is an exploded view of a fastener in accordance with the invention. The fastener has a shank 10 which has a head 5 at the opposite end. The head 5 shown is circular and has no means by which it can be gripped by a spanner or a wrench. Because of the design of the washer and of the other end of the bolt, it will not be necessary to grip the head, because the torsional forces generated on tightening the nut are taken up between the washer, workpiece and bolt at the lower end of the bolt. A conventional hexagon bolt head can therefore be omitted. The shank has a splined portion 12 and a threaded portion 14. A washer 16 and a nut 18 are provided. The washer has a washer disc 20 with raised serrations 22 on its upper surface and a collar 24 with internal splines 26. The washer fits over the end of the shank 10 with the splines 26 engaging on the splined portion 12. In use, the bolt is passed through bores in the workpieces which are to be held together. The washer is placed over the end of the bolt and the nut is screwed on. The washer then pulls up against the workpiece and the serrations 22 bite in to the workpiece surface. Further tightening of the nut puts the shank 10 into tension and pulls the end of the shank through the washer. Because the washer cannot rotate, the shank only moves relative to the washer by sliding through the splines. CLAIMS
1. A threaded fastener having a shank, a threaded region at one end of the shank, a nut to be screwed onto the threaded region and a washer, the washer being adapted to form a connection between a workpiece in which the fastener is used and the said one end of the shank, the connection being such as to prevent relative rotational movement between the workpiece and said one end of the shank while permitting axial movement of the shank relative to the washer.
2. A fastener as claimed in Claim 1, wherein the washer has a face which, in use, will be in contact with the workpiece and which has serrations or other formations on its surface which will bite into the workpiece to prevent the washer rotating relative to the workpiece.
3. A fastener as claimed in Claim 1 or Claim 2, wherein the internal circumference of the washer has splines which mate with splines on the fastener shank to prevent relative rotational movement while permitting relative axial movement.
4. A fastener as claimed in Claim 3, wherein the washer has a collar formed on its inner circumference, with the internal surface of the collar carrying the splines.
5. A fastener as claimed in Claim 4, wherein the outside of the collar is provided with a formation, preferably tapered, which grips inside a counterbore in the workpiece and helps to stop the washer turning relative to the workpiece.
6. A fastener as claimed in any preceding claim which has a head, an unthreaded shank portion and a thread at the end remote from the head.
7. A threaded fastener substantially as herein described with reference to the accompanying drawing.
GB08423556A 1984-09-18 1984-09-18 Preventing twisting of threaded fastener shanks Expired GB2164715B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08423556A GB2164715B (en) 1984-09-18 1984-09-18 Preventing twisting of threaded fastener shanks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08423556A GB2164715B (en) 1984-09-18 1984-09-18 Preventing twisting of threaded fastener shanks

Publications (3)

Publication Number Publication Date
GB8423556D0 GB8423556D0 (en) 1984-10-24
GB2164715A true GB2164715A (en) 1986-03-26
GB2164715B GB2164715B (en) 1987-09-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08423556A Expired GB2164715B (en) 1984-09-18 1984-09-18 Preventing twisting of threaded fastener shanks

Country Status (1)

Country Link
GB (1) GB2164715B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2212555A (en) * 1987-11-17 1989-07-26 Britax Restmor Ltd Clamping pivot
EP0359986A1 (en) * 1988-09-06 1990-03-28 Westinghouse Electric Corporation Apparatus for supporting the torque load on a gasturbine vane
GB2265198A (en) * 1992-02-14 1993-09-22 Gec Avery Ltd Mounting of force sensors by bolts
CN102322469A (en) * 2011-08-19 2012-01-18 中国兵器工业集团第七○研究所 Ultra-long bolt

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1125782A (en) * 1964-09-16 1968-08-28 Rosan Eng Corp Fastener with snap-on captive locking ring
GB1345784A (en) * 1970-04-27 1974-02-06 Rosan Eng Corp Stud fastener assembly
GB2088507A (en) * 1980-10-13 1982-06-09 Tower Scaffolding Bristol Ltd Improvements in and relating to formwork

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1125782A (en) * 1964-09-16 1968-08-28 Rosan Eng Corp Fastener with snap-on captive locking ring
GB1345784A (en) * 1970-04-27 1974-02-06 Rosan Eng Corp Stud fastener assembly
GB2088507A (en) * 1980-10-13 1982-06-09 Tower Scaffolding Bristol Ltd Improvements in and relating to formwork

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2212555A (en) * 1987-11-17 1989-07-26 Britax Restmor Ltd Clamping pivot
GB2212555B (en) * 1987-11-17 1991-10-09 Britax Restmor Ltd Clamping pivot
EP0359986A1 (en) * 1988-09-06 1990-03-28 Westinghouse Electric Corporation Apparatus for supporting the torque load on a gasturbine vane
GB2265198A (en) * 1992-02-14 1993-09-22 Gec Avery Ltd Mounting of force sensors by bolts
GB2265198B (en) * 1992-02-14 1995-05-17 Gec Avery Ltd A load cell
CN102322469A (en) * 2011-08-19 2012-01-18 中国兵器工业集团第七○研究所 Ultra-long bolt

Also Published As

Publication number Publication date
GB2164715B (en) 1987-09-30
GB8423556D0 (en) 1984-10-24

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