CA1164183A - Roofing insulation fastener assembly - Google Patents
Roofing insulation fastener assemblyInfo
- Publication number
- CA1164183A CA1164183A CA000399523A CA399523A CA1164183A CA 1164183 A CA1164183 A CA 1164183A CA 000399523 A CA000399523 A CA 000399523A CA 399523 A CA399523 A CA 399523A CA 1164183 A CA1164183 A CA 1164183A
- Authority
- CA
- Canada
- Prior art keywords
- fastener
- washer
- head
- assembly
- roofing insulation
- 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
Landscapes
- Bolts, Nuts, And Washers (AREA)
- Connection Of Plates (AREA)
Abstract
Case 3881 ROOFING INSULATION FASTENER ASSEMBLY
ABSTRACT
A fastener assembly for attaching roofing insulation to roof decks. A washer with a broad load-distributing flange has a crushable region which is deformed as the fastener becomes fully seated. This region insures that the joint is loaded with a predetermined force before the depth-sensitive driver disengages reducing the likelihood of overdriving or underdriving.
ABSTRACT
A fastener assembly for attaching roofing insulation to roof decks. A washer with a broad load-distributing flange has a crushable region which is deformed as the fastener becomes fully seated. This region insures that the joint is loaded with a predetermined force before the depth-sensitive driver disengages reducing the likelihood of overdriving or underdriving.
Description
1 8 ~
ROOFING INSULATION FASThNER ASSEMBLY
BAcKG~ouND AND SUMMARY OF THE INVENTION
_. ~
Thls application is related to my co-pending Canadian application serlal no. 385,282 filed September 4, l9~l. The present invention is directed to a roofing insulation faseener assembly.
The fa~tening of compressible insulations to metal or concrete roof decks has required new fastening techniques, one of which is depicted in the abovenoted application. With some washer ronfigurations, a problem can arise in seating the fastener. Typically, power driven screwdrivers are used to install these fastener assemblies. Many of these screw-drivers have clutches or other drive engaging means which rely on axial displacement of the fastener head to disengage the drive. If the washer has a planar configuration, ~here is little movement of the head during seating. This can result in the assembly being left loose. If the clutch is adjusted for deeper drive, an over-drive situation can develop in which the insulation is compressed beyond its elastic limit.
The present invention provides a solution to this problem.
A crushable region of the washer adjacent the fastener receiving aperture insures that a proper preloading o f the joint occurs prior to drive disengagement. This provides a larger margin for error in adjustment of the clutch settings and reduces the chances of underdriving and overdriving.
. ~ . .
-1 1641~3 Thus, broadly, the invention contemplates a roofing insulation fastener assembly for use with a power driven screwdriver in which axial displacement of a fastener causes the fastener to disengage from the screwdriver. The assembly comprises a fastener with a shank having a head at one end, with the head having a first predetermined lateral dimension and drive-receiving surfaces thereon. The shank has threads thereon with a second lesser predetermined lateral dimension.
A washer is provided having a broad load-distributing flange.
~ centrally located aperture defines a third predetermined dimension less than the first and greater than the second predetermined dimension. A crushable axially extending portion is formed integrally with the washer flange in the vicinity of the aperture and is axially deformable to an extent sufficient lS to cause disengagement between the screwdriver and the drive receiving surfaces as the head of the fastener becomes fully seated and requires a predetermined pre-load to collapse thus insuring proper joint loading.
Other features, characteristics and advantages of the present invention will become apparent after a reading of the following specification taken in conjunction with the appended drawings.
Case 3881 1 1~ 83 BRIEF DESCRIPTION OF THE DRAWINGS
1 Fig. 1 is a side elevational view in partial cross section of the fastener assembly of the present invention;
Fig. 2 is a side elevational view in partial section of the assembly in fully seated position;
Fig. 3 is a top elevational view of one configuration of the washer of the present assembly;
Fig. 4 is a cross-sectional side view of an alternate form of the washer of the present assembly;
Fig. 5 is a top elevational view of a metal washer employing the teachings of the present invention;
Fig. 6 is a cross-sectional view of the washer shown in Fig.
5 taken along line 6-6.
Case 3881 l 164183 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
1 The fastener assembly of the present invention is shown generally at 10. The assembly 10 comprises a fastener 12 having a head 14 with a first predetermined lateral dimension at one end with drive surfaces thereon, in the case depicted, formed as an internal drive recess 16. A threaded shank 18 extends from the head and has a second lesser predetermined lateral dimension. Depending on the application, the thread may be of the self-tapping variety and the tip may have a drill point 19 to enable the fastener to penetrate a variety of materials.
The second element of the assembly 10 is washer 20 which is preferably made of a plastic or elastomeric material.
Washer 20 has a broad load-distributing flange 22 and a centrally located aperture 24. The aperture defines a third predeter-mined lateral dimension which is less than the first but greater than the second predetermined dimension. The upper surface of the flange may be provided with a recess 26 of sufficient size to accommodate the head 14 of fastener 12. A crushable portion 28 îs provided adjacent the aperture 24 for purposes which will be detailed hereafter. The upper surface of the flange 22 may be provided with a locater ring 30 to facilitate positioning of a conventional nosepiece 31 from a power screwdriver (not shown).
In Fig. l, fastener assembly lO is depicted in a partially installed position which, but for the features of the present invention, could exist after installation. Roofing insulation board 33 is shown as being warped with steel girt 35 positioned Case 38Bl ~ 1641~3 1 therebeneath. As can be appreciated, without crushable portion 28, there would be little relative change in position between head 16 of fastener 12 and flange 22 of the washer. Since many screwguns rely on such an axial displacement in order to disengage the drive through a clutch or the like, lack of such movement creates a problem. No setting of the depth gauge will be correct for successive applications resulting in a high percentage of underdriven and overdriven fasteners.
As depicted in Fig. 2, the insulation board 33 is drawn up against girt 35 before the pre-load of crushable region 28 is overcome and the head reaches its fully seated position. Of course the amount of pre-load can be varied for each board application by varying the height and diameter of the crushable region. As viewed in Fig. 2, drive to the driver bit 37 has been disengaged or the bit withdrawn from recess 16, depending on the type of drive employed, as the fastener assembly is fully seated. An additional benefit is that the material from the crushable region collapses toward the shank 18 providing a seal as well as prevailing torque for the fastener. This assembly insures that a certain preloading of the joint occurs before the drive is disengaged. Further, it provides a range of acceptable depth settings for the power screwdriver when no particular setting would have been appropriate before.
Fig. 4 shows an alternative embodiment of the washer 20 usable in the assembly of the present invention. The crushable region is formed as a cylindrical boss 28' which can again be varied to fit the application. Whether the crushable region takes the form of a cylindrical boss or the fillet of the previous embodiment depends largely on the nature of the material of the washer and the desired crush resistance to establish the preload.
Case 38~1 ~ 1643L8.3 1 Figures 5 and 6 depict the principles of the invention utiliæed with a low profile metallic wasller. With such a low profile, there would be virtually -no relative axial movement without the crushable ~one 28.
~, Although the fastener assembly has been depicted as being used with roofing insulati()n~ it wlll be appreciated that this invention may be used with any compressible material where similar problems might arise.
Various changes, modifications and alternatives will beco~e apparent following a reading of the foregoing specification.
Accordingly, it is intended that all such changes~ modifications and alternatives A9 come within the scope of the appended claims be considered part of the present invention.
ROOFING INSULATION FASThNER ASSEMBLY
BAcKG~ouND AND SUMMARY OF THE INVENTION
_. ~
Thls application is related to my co-pending Canadian application serlal no. 385,282 filed September 4, l9~l. The present invention is directed to a roofing insulation faseener assembly.
The fa~tening of compressible insulations to metal or concrete roof decks has required new fastening techniques, one of which is depicted in the abovenoted application. With some washer ronfigurations, a problem can arise in seating the fastener. Typically, power driven screwdrivers are used to install these fastener assemblies. Many of these screw-drivers have clutches or other drive engaging means which rely on axial displacement of the fastener head to disengage the drive. If the washer has a planar configuration, ~here is little movement of the head during seating. This can result in the assembly being left loose. If the clutch is adjusted for deeper drive, an over-drive situation can develop in which the insulation is compressed beyond its elastic limit.
The present invention provides a solution to this problem.
A crushable region of the washer adjacent the fastener receiving aperture insures that a proper preloading o f the joint occurs prior to drive disengagement. This provides a larger margin for error in adjustment of the clutch settings and reduces the chances of underdriving and overdriving.
. ~ . .
-1 1641~3 Thus, broadly, the invention contemplates a roofing insulation fastener assembly for use with a power driven screwdriver in which axial displacement of a fastener causes the fastener to disengage from the screwdriver. The assembly comprises a fastener with a shank having a head at one end, with the head having a first predetermined lateral dimension and drive-receiving surfaces thereon. The shank has threads thereon with a second lesser predetermined lateral dimension.
A washer is provided having a broad load-distributing flange.
~ centrally located aperture defines a third predetermined dimension less than the first and greater than the second predetermined dimension. A crushable axially extending portion is formed integrally with the washer flange in the vicinity of the aperture and is axially deformable to an extent sufficient lS to cause disengagement between the screwdriver and the drive receiving surfaces as the head of the fastener becomes fully seated and requires a predetermined pre-load to collapse thus insuring proper joint loading.
Other features, characteristics and advantages of the present invention will become apparent after a reading of the following specification taken in conjunction with the appended drawings.
Case 3881 1 1~ 83 BRIEF DESCRIPTION OF THE DRAWINGS
1 Fig. 1 is a side elevational view in partial cross section of the fastener assembly of the present invention;
Fig. 2 is a side elevational view in partial section of the assembly in fully seated position;
Fig. 3 is a top elevational view of one configuration of the washer of the present assembly;
Fig. 4 is a cross-sectional side view of an alternate form of the washer of the present assembly;
Fig. 5 is a top elevational view of a metal washer employing the teachings of the present invention;
Fig. 6 is a cross-sectional view of the washer shown in Fig.
5 taken along line 6-6.
Case 3881 l 164183 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
1 The fastener assembly of the present invention is shown generally at 10. The assembly 10 comprises a fastener 12 having a head 14 with a first predetermined lateral dimension at one end with drive surfaces thereon, in the case depicted, formed as an internal drive recess 16. A threaded shank 18 extends from the head and has a second lesser predetermined lateral dimension. Depending on the application, the thread may be of the self-tapping variety and the tip may have a drill point 19 to enable the fastener to penetrate a variety of materials.
The second element of the assembly 10 is washer 20 which is preferably made of a plastic or elastomeric material.
Washer 20 has a broad load-distributing flange 22 and a centrally located aperture 24. The aperture defines a third predeter-mined lateral dimension which is less than the first but greater than the second predetermined dimension. The upper surface of the flange may be provided with a recess 26 of sufficient size to accommodate the head 14 of fastener 12. A crushable portion 28 îs provided adjacent the aperture 24 for purposes which will be detailed hereafter. The upper surface of the flange 22 may be provided with a locater ring 30 to facilitate positioning of a conventional nosepiece 31 from a power screwdriver (not shown).
In Fig. l, fastener assembly lO is depicted in a partially installed position which, but for the features of the present invention, could exist after installation. Roofing insulation board 33 is shown as being warped with steel girt 35 positioned Case 38Bl ~ 1641~3 1 therebeneath. As can be appreciated, without crushable portion 28, there would be little relative change in position between head 16 of fastener 12 and flange 22 of the washer. Since many screwguns rely on such an axial displacement in order to disengage the drive through a clutch or the like, lack of such movement creates a problem. No setting of the depth gauge will be correct for successive applications resulting in a high percentage of underdriven and overdriven fasteners.
As depicted in Fig. 2, the insulation board 33 is drawn up against girt 35 before the pre-load of crushable region 28 is overcome and the head reaches its fully seated position. Of course the amount of pre-load can be varied for each board application by varying the height and diameter of the crushable region. As viewed in Fig. 2, drive to the driver bit 37 has been disengaged or the bit withdrawn from recess 16, depending on the type of drive employed, as the fastener assembly is fully seated. An additional benefit is that the material from the crushable region collapses toward the shank 18 providing a seal as well as prevailing torque for the fastener. This assembly insures that a certain preloading of the joint occurs before the drive is disengaged. Further, it provides a range of acceptable depth settings for the power screwdriver when no particular setting would have been appropriate before.
Fig. 4 shows an alternative embodiment of the washer 20 usable in the assembly of the present invention. The crushable region is formed as a cylindrical boss 28' which can again be varied to fit the application. Whether the crushable region takes the form of a cylindrical boss or the fillet of the previous embodiment depends largely on the nature of the material of the washer and the desired crush resistance to establish the preload.
Case 38~1 ~ 1643L8.3 1 Figures 5 and 6 depict the principles of the invention utiliæed with a low profile metallic wasller. With such a low profile, there would be virtually -no relative axial movement without the crushable ~one 28.
~, Although the fastener assembly has been depicted as being used with roofing insulati()n~ it wlll be appreciated that this invention may be used with any compressible material where similar problems might arise.
Various changes, modifications and alternatives will beco~e apparent following a reading of the foregoing specification.
Accordingly, it is intended that all such changes~ modifications and alternatives A9 come within the scope of the appended claims be considered part of the present invention.
Claims (3)
1. A roofing insulation fastener assembly for use with a power driven screwdriver in which axial displacement of a fastener causes the fastener to disengage from the screwdriver, said assembly comprising a fastener with a shank having a head at one end, said head having a first predetermined lateral dimension and drive-receiving surfaces thereon, said shank having threads thereon with a second lesser predetermined lateral dimension, a washer having a broad load-distributing flange, a centrally located aperture which defines a third predetermined dimension less than the first and greater than the second predetermined dimension, a crushable axially extending portion formed integrally with the washer flange in the vicinity of the aperture, said crushable portion being axially deformable to an extent sufficient to cause disengagement between said screwdriver and said drive receiving surfaces as the head of the fastener becomes fully seated and requiring a predetermined pre-load to collapse thus insuring proper joint loading.
2. A roofing insulation fastener assembly according to Claim 1 wherein the crushable portion comprises a generally axially extending boss which has a lateral dimension substantially equal to that of the fastener head.
3. The roofing insulation fastener assembly of Claim 1 wherein the washer is comprised of an elastomeric material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US26132181A | 1981-05-07 | 1981-05-07 | |
| US261,321 | 1981-05-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1164183A true CA1164183A (en) | 1984-03-27 |
Family
ID=22992790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000399523A Expired CA1164183A (en) | 1981-05-07 | 1982-03-26 | Roofing insulation fastener assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1164183A (en) |
-
1982
- 1982-03-26 CA CA000399523A patent/CA1164183A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |