CA1164692A - Screw fixing - Google Patents
Screw fixingInfo
- Publication number
- CA1164692A CA1164692A CA000352225A CA352225A CA1164692A CA 1164692 A CA1164692 A CA 1164692A CA 000352225 A CA000352225 A CA 000352225A CA 352225 A CA352225 A CA 352225A CA 1164692 A CA1164692 A CA 1164692A
- Authority
- CA
- Canada
- Prior art keywords
- screw
- nut
- channel
- teeth
- flanges
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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
- F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
- F16B37/045—Devices for fastening nuts to surfaces, e.g. sheets, plates specially adapted for fastening in channels, e.g. sliding bolts, channel nuts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Connection Of Plates (AREA)
- Clamps And Clips (AREA)
- Surgical Instruments (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Dowels (AREA)
- Threshing Machine Elements (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
ABSTRACT
A screw fixing comprising a screw (9) having a nut (1) threaded on it, the screw head and the nut each having a bearing surface facing the other, and a channel (5) having at the free ends of the limbs of the channel inturned flanges (6) directed towards the base (8) of the channel, the flanges defin-ing a slot (10) which is open at both ends, at least one of the flanges having teeth (7) in the free edge of the flange directed towards the base of the channel and a bearing surface, selected from the bearing surface on the nut and the bearing surface on the screw head, that engages said free edge having parallel ribs (4) that interlock with the teeth to prevent the screw and nut sliding longitudinally in the channel.
A screw fixing comprising a screw (9) having a nut (1) threaded on it, the screw head and the nut each having a bearing surface facing the other, and a channel (5) having at the free ends of the limbs of the channel inturned flanges (6) directed towards the base (8) of the channel, the flanges defin-ing a slot (10) which is open at both ends, at least one of the flanges having teeth (7) in the free edge of the flange directed towards the base of the channel and a bearing surface, selected from the bearing surface on the nut and the bearing surface on the screw head, that engages said free edge having parallel ribs (4) that interlock with the teeth to prevent the screw and nut sliding longitudinally in the channel.
Description
SCREW FIXING
This invention relates to screw fixings of the kind in which a screw (or threaded bolt) screws into a ~emale threaded member (a nu~) that is distinct ~rom the ma~or members fixed together thereb~, and which is capable of being ad~usted along the length o~ a slot in one of the major membars.
One important instance is in the fixing o~
brackets or other fittings to channels of the kind~(~or example that sold by the Applicants through their subsi-diary BICC Components Ltd. under the Trade Mark "Leprack"
as Leprack channel) having inturned flanges at the free ends of the limbs o~ the channel, to which fixings are commonly made by using a rectangular nut (usually with two rounded corners) that can be passed through the open slot between the inturned flanges and then rotated through 90 to engage behind those ~langes, the screw and the nut then being tightened.
This arrangement has the disadvantage that when the screw and nut are being tightened and sometimes a~ter it is tightened and under load~ the screw and nut may slide longitudinally in the~channel In accordance with the present invention, a screw fixing comprises a screw having a nut threaded on it, the screw head and the nut each having a bearing sur~ace faclng the other, and a cha~mel having at the free ends o~ the limbs o~ the channel inturned flanges directed towards the '`' `~
base of the channel, the flanges defining a slot which is open at both ends, at least one of the flanges having teeth in the free edge of the flange directed towards the base o~ ~he channel, and a bearing surface, selected from the bearing surface on the nut and the bearing surface on the screw head, that engages said free edge having parallel ribs that interlock with the teeth to prevent the screw and nut sliding longitudinal-ly in the channel.
The teeth in the flanye are preferably perpendicular to the major axis of the slot, although they may be set at a small angle thereto. Further, when there are teeth on both edges of the slot, the ribs may sometimes be engageable with alternative teeth on one edge for each position of engagement on the other, so providing firm engagement in saveral angular positions of the nut or screw head.
The pitch of the ribs is preferably the same as the pitch of the teeth. Alternatively the pitch of the ribs may be double that of the teeth, or another small multiple thereof.
Where the bearing surface having parallel ribs is on the nut, the ribs may be formed by any suitable method, for example the nut may be forged or stamped, in which case the ribs preferably extend only part way across the bearing surface.
Alternatively the ribs may be formed as a section from which the nut is to be formed is rolled or extruded, before the ends of the nut are machined and a hole is drilled and tapped; in this case the ribs will normally extend longitudinally right across the surface.
Preferably the nut or screw head, as the case may be, is non-circular (for example it may be of the usual basically rectangular shape with two opposite coxners rounded or other-wise relieved) so that it can be passed through the slo~ and rotated to engage the inturned flanges of the channel; in this case the ribs will extend at least approximately parallel to the major dimension of the nut or screw head (as the longer side of the rectangle).
The invention also includes a method of making a screw fixing comprising presenting to a channel having at the free ends of the limbs of the channel inturned flanges directed to-wards the base of the channel, the flanges defining a slot which is open at both ends, a device comprising a screw haviny a nut threaded on it, passing through the slot a non-circular abutment member selected from the screw head and the nut, rotating the screw and the nut together until the abutment member engages the inturned flanges of the channel, the abutment member having parallel ribs and at least one of the inturned flanges, having teeth in its free edye directed towards the base of the channel which can interengage, and then rotating the screw relative to the nut to screw the nut towards the screw head, the ribs and teeth interlocking to prevent the screw and nut sliding longitudinally in the channel.
In most cases the sides of the slot will be parallel, but this is not essential.
Preferably the device comprises a fitting having a screw passing (and preferably pre-inserted) through a cleaxance hole therein and having a nut threaded on it.
In this case the clearance hole pre:~erably has a diameter equal to or slightly greater than the sum of the screw diameter and ` the pitch of the teeth. This allows the fi-tting to be located . longitudinally of the slot in any required position re].ative to the major member despite the finite size of the ribs and teeth~
Preferably the screw and the nut are enyaged by means which offer resistance to but do not prevent, screwing of the nut towards the screw head.
The teeth on the inturned flanges can be formed in any convenient manner but preferably they are formed by knurling, punching or otherwise shaping the edge of the channel preform ~or at least one of them) before the preform is folded into the shape of the channel. Preferably this operation is carried out in-line with the folding of the preform, or it could be done during slitting of metal to form the flat preform.
The invention is now described with reference to and as shown in the accompanying drawings in which:-Figure 1 is a cross-section through the line I-I in Figure 2 of a nut for use in one aspect of the invention;
Figures 2 and 3 are top and perspective views respectively of the nut;
Figures 4 and 5 are part sectional views of a channel;
and Figure 6 is a view of this aspect of the invention.
The nut 1 shown in Figures 1 to 3 has an approximately rectangular shape with two of the opposite corners 2 and ~ rounded. Ribs 4 have been forme~ on one surface of the nut 1 in stamping o~ the nut. The apex of each rib has an approximate angle of 90, and the ribs have a pitch of appro~imatel~ 2mm.
The channel 5 shown in Figures 4 and 5 has inturned flanges 6 at the free ends o~ the limbs o~ the channel directed towards the base 8 o~ the channel, each flange having teeth 7 formed in its free edge. The teeth 7 are perpendicular to the face of the flange 63 are directed towards the base 8 of the channel 5, and are complementary in shape and size to the ribs on the nut.
Figure 6 shows the position of two nuts 1, one o~
which has a screw 9 threaded to it,in the channel 5~ with the ribs 4 interengaging with the grooves 7 on the flanges 6 of the channel. The flanges 6 de~ine a slot 10, which is open at both endsJ in the channel 5. The nuts 1 may be provided with a biassing spring positioned between ~ch nut and the base 8 of the channel to urge the nut towards the inturned flanges 6 of the channel.
Although in this example the ribs have an apex of 90, a wide range of alternative values can be used success~ully,
This invention relates to screw fixings of the kind in which a screw (or threaded bolt) screws into a ~emale threaded member (a nu~) that is distinct ~rom the ma~or members fixed together thereb~, and which is capable of being ad~usted along the length o~ a slot in one of the major membars.
One important instance is in the fixing o~
brackets or other fittings to channels of the kind~(~or example that sold by the Applicants through their subsi-diary BICC Components Ltd. under the Trade Mark "Leprack"
as Leprack channel) having inturned flanges at the free ends of the limbs o~ the channel, to which fixings are commonly made by using a rectangular nut (usually with two rounded corners) that can be passed through the open slot between the inturned flanges and then rotated through 90 to engage behind those ~langes, the screw and the nut then being tightened.
This arrangement has the disadvantage that when the screw and nut are being tightened and sometimes a~ter it is tightened and under load~ the screw and nut may slide longitudinally in the~channel In accordance with the present invention, a screw fixing comprises a screw having a nut threaded on it, the screw head and the nut each having a bearing sur~ace faclng the other, and a cha~mel having at the free ends o~ the limbs o~ the channel inturned flanges directed towards the '`' `~
base of the channel, the flanges defining a slot which is open at both ends, at least one of the flanges having teeth in the free edge of the flange directed towards the base o~ ~he channel, and a bearing surface, selected from the bearing surface on the nut and the bearing surface on the screw head, that engages said free edge having parallel ribs that interlock with the teeth to prevent the screw and nut sliding longitudinal-ly in the channel.
The teeth in the flanye are preferably perpendicular to the major axis of the slot, although they may be set at a small angle thereto. Further, when there are teeth on both edges of the slot, the ribs may sometimes be engageable with alternative teeth on one edge for each position of engagement on the other, so providing firm engagement in saveral angular positions of the nut or screw head.
The pitch of the ribs is preferably the same as the pitch of the teeth. Alternatively the pitch of the ribs may be double that of the teeth, or another small multiple thereof.
Where the bearing surface having parallel ribs is on the nut, the ribs may be formed by any suitable method, for example the nut may be forged or stamped, in which case the ribs preferably extend only part way across the bearing surface.
Alternatively the ribs may be formed as a section from which the nut is to be formed is rolled or extruded, before the ends of the nut are machined and a hole is drilled and tapped; in this case the ribs will normally extend longitudinally right across the surface.
Preferably the nut or screw head, as the case may be, is non-circular (for example it may be of the usual basically rectangular shape with two opposite coxners rounded or other-wise relieved) so that it can be passed through the slo~ and rotated to engage the inturned flanges of the channel; in this case the ribs will extend at least approximately parallel to the major dimension of the nut or screw head (as the longer side of the rectangle).
The invention also includes a method of making a screw fixing comprising presenting to a channel having at the free ends of the limbs of the channel inturned flanges directed to-wards the base of the channel, the flanges defining a slot which is open at both ends, a device comprising a screw haviny a nut threaded on it, passing through the slot a non-circular abutment member selected from the screw head and the nut, rotating the screw and the nut together until the abutment member engages the inturned flanges of the channel, the abutment member having parallel ribs and at least one of the inturned flanges, having teeth in its free edye directed towards the base of the channel which can interengage, and then rotating the screw relative to the nut to screw the nut towards the screw head, the ribs and teeth interlocking to prevent the screw and nut sliding longitudinally in the channel.
In most cases the sides of the slot will be parallel, but this is not essential.
Preferably the device comprises a fitting having a screw passing (and preferably pre-inserted) through a cleaxance hole therein and having a nut threaded on it.
In this case the clearance hole pre:~erably has a diameter equal to or slightly greater than the sum of the screw diameter and ` the pitch of the teeth. This allows the fi-tting to be located . longitudinally of the slot in any required position re].ative to the major member despite the finite size of the ribs and teeth~
Preferably the screw and the nut are enyaged by means which offer resistance to but do not prevent, screwing of the nut towards the screw head.
The teeth on the inturned flanges can be formed in any convenient manner but preferably they are formed by knurling, punching or otherwise shaping the edge of the channel preform ~or at least one of them) before the preform is folded into the shape of the channel. Preferably this operation is carried out in-line with the folding of the preform, or it could be done during slitting of metal to form the flat preform.
The invention is now described with reference to and as shown in the accompanying drawings in which:-Figure 1 is a cross-section through the line I-I in Figure 2 of a nut for use in one aspect of the invention;
Figures 2 and 3 are top and perspective views respectively of the nut;
Figures 4 and 5 are part sectional views of a channel;
and Figure 6 is a view of this aspect of the invention.
The nut 1 shown in Figures 1 to 3 has an approximately rectangular shape with two of the opposite corners 2 and ~ rounded. Ribs 4 have been forme~ on one surface of the nut 1 in stamping o~ the nut. The apex of each rib has an approximate angle of 90, and the ribs have a pitch of appro~imatel~ 2mm.
The channel 5 shown in Figures 4 and 5 has inturned flanges 6 at the free ends o~ the limbs o~ the channel directed towards the base 8 o~ the channel, each flange having teeth 7 formed in its free edge. The teeth 7 are perpendicular to the face of the flange 63 are directed towards the base 8 of the channel 5, and are complementary in shape and size to the ribs on the nut.
Figure 6 shows the position of two nuts 1, one o~
which has a screw 9 threaded to it,in the channel 5~ with the ribs 4 interengaging with the grooves 7 on the flanges 6 of the channel. The flanges 6 de~ine a slot 10, which is open at both endsJ in the channel 5. The nuts 1 may be provided with a biassing spring positioned between ~ch nut and the base 8 of the channel to urge the nut towards the inturned flanges 6 of the channel.
Although in this example the ribs have an apex of 90, a wide range of alternative values can be used success~ully,
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A screw fixing comprising a screw having a nut threaded on it, the screw head and the nut each having a bearing surface facing the other, and a channel having at the free ends of the limbs of the channel inturned flanges directed towards the base of the channel, the flanges defining a slot which is open at both ends, at least one of the flanges having teeth in the free edge of the flange directed towards the base of the channel and a bearing surface, selected from the bearing surface on the nut and the bearing surface on the screw head, that engages said free edge having parallel ribs that interlock with the teeth to prevent the screw and the nut sliding longitudinally in the channel.
2. A screw fixing as claimed in Claim 1 in which the teeth in the inturned flanges are perpendicular to the major axis of the slot.
3. A screw fixing as claimed in Claim 1 or 2 in which the pitch of the ribs is the same as the pitch of the teeth.
4. A screw fixing as claimed in Claim 1 or 2 in which the pitch of the ribs is double the pitch of the teeth or another small multiple thereof.
5. A screw fixing as claimed in Claim 1 in which the nut or the screw head, as the case may be, is non-circular so that it can be passed through the slot and rotated to engage the inturned flanges of the channel.
6. A screw fixing as claimed in Claim 5 in which the ribs extend approximately parallel to the major dimension of the nut or screw head.
7. A method of making a screw fixing comprising present-ing to a channel having at the free ends of the limbs of the channel inturned flanges directed towards the base of the channel, the flanges defining a slot which is open at both ends, a device comprising a screw having a nut threaded on it passing through the slot a non-circular abutment member selected from the screw head and the nut, rotating the screw and the nut together until the abutment member engages the inturned flanges of the channel, the abutment member having parallel ribs and at least one of the inturned flanges having teeth in its free edge directed towards the base of the channel which can interengage, and then rotating the screw relative to the nut to screw the nut towards the screw head, the ribs and teeth interlocking to pre-vent the screw and nut sliding longitudinally in the channel.
8. A method as claimed in Claim 7 in which the device comprises a fitting having a screw pre-inserted through a clearance hole therein and having a nut threaded on it.
9. A method as claimed in Claim 8 in which the clearance hole has a diameter equal to or slightly greater than the sum of the screw diameter and the pitch of the teeth.
10. A method as claimed in any one of Claims 7, 8 or 9 in which the screw and nut are engaged by means which offer resistance to, but do not prevent, screwing of the nut towards the screw head.
11. A method as claimed in Claim 7 in which the teeth in the inturned flanges are formed by knurling or punching the channel preform before the preform is folded into the shape of the channel.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7918495 | 1979-05-25 | ||
| GB7918495 | 1979-05-25 | ||
| GB7921156 | 1979-06-18 | ||
| GB7921156 | 1979-06-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1164692A true CA1164692A (en) | 1984-04-03 |
Family
ID=26271667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000352225A Expired CA1164692A (en) | 1979-05-25 | 1980-05-20 | Screw fixing |
Country Status (13)
| Country | Link |
|---|---|
| AU (1) | AU535256B2 (en) |
| CA (1) | CA1164692A (en) |
| DE (1) | DE3019292A1 (en) |
| DK (1) | DK223380A (en) |
| ES (1) | ES250913Y (en) |
| FR (1) | FR2457407A1 (en) |
| HK (1) | HK39284A (en) |
| IT (1) | IT8048771A0 (en) |
| MY (1) | MY8500366A (en) |
| NL (1) | NL8003013A (en) |
| NO (1) | NO801532L (en) |
| SE (1) | SE8003861L (en) |
| SG (1) | SG3684G (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2514084B1 (en) * | 1981-10-07 | 1985-09-13 | Telemecanique Electrique | DEVICE BY SCREWING ONTO A PROFILE AND COMBINING A PROFILE WITH SUCH A DEVICE |
| FR2647859B1 (en) * | 1989-05-30 | 1991-08-23 | Ozenfant Sa | PROFILE ASSEMBLY KEY, PROFILES AND STRUCTURES FORMED FROM AT LEAST TWO PROFILES ASSEMBLED BY SUCH A KEY |
| JP3183802B2 (en) * | 1995-04-13 | 2001-07-09 | 矢崎総業株式会社 | Assembly structure of different nuts |
| CN108996191B (en) * | 2018-07-23 | 2024-03-05 | 厦门保沣集团有限公司 | Limiting device for assisting sheet conveying and using method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1929835A (en) * | 1929-11-11 | 1933-10-10 | Floor Accessories Company Inc | Concrete insert |
| US1933536A (en) * | 1930-05-16 | 1933-11-07 | Floor Accessories Company Inc | Concrete insert |
| US1924884A (en) * | 1931-04-25 | 1933-08-29 | Truscon Steel Co | Mounting device for concrete wall structures and the like |
-
1980
- 1980-05-20 AU AU58568/80A patent/AU535256B2/en not_active Ceased
- 1980-05-20 CA CA000352225A patent/CA1164692A/en not_active Expired
- 1980-05-21 DE DE19803019292 patent/DE3019292A1/en not_active Withdrawn
- 1980-05-22 DK DK223380A patent/DK223380A/en not_active Application Discontinuation
- 1980-05-22 FR FR8011464A patent/FR2457407A1/en active Pending
- 1980-05-22 NO NO801532A patent/NO801532L/en unknown
- 1980-05-23 SE SE8003861A patent/SE8003861L/en not_active Application Discontinuation
- 1980-05-23 ES ES1980250913U patent/ES250913Y/en not_active Expired
- 1980-05-23 NL NL8003013A patent/NL8003013A/en not_active Application Discontinuation
- 1980-05-23 IT IT8048771A patent/IT8048771A0/en unknown
-
1984
- 1984-01-13 SG SG36/84A patent/SG3684G/en unknown
- 1984-05-03 HK HK392/84A patent/HK39284A/en unknown
-
1985
- 1985-12-30 MY MY366/85A patent/MY8500366A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE8003861L (en) | 1980-11-26 |
| AU535256B2 (en) | 1984-03-08 |
| SG3684G (en) | 1985-02-01 |
| IT8048771A0 (en) | 1980-05-23 |
| ES250913Y (en) | 1981-05-16 |
| DK223380A (en) | 1980-11-26 |
| DE3019292A1 (en) | 1980-12-04 |
| MY8500366A (en) | 1985-12-31 |
| NO801532L (en) | 1980-11-26 |
| FR2457407A1 (en) | 1980-12-19 |
| AU5856880A (en) | 1980-11-27 |
| ES250913U (en) | 1980-11-16 |
| NL8003013A (en) | 1980-11-27 |
| HK39284A (en) | 1984-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |