CA1115100A - Device and assembly for mounting parts - Google Patents
Device and assembly for mounting partsInfo
- Publication number
- CA1115100A CA1115100A CA312,558A CA312558A CA1115100A CA 1115100 A CA1115100 A CA 1115100A CA 312558 A CA312558 A CA 312558A CA 1115100 A CA1115100 A CA 1115100A
- Authority
- CA
- Canada
- Prior art keywords
- insert
- fastener
- assembly
- base member
- compressive force
- 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
- 239000000463 material Substances 0.000 claims description 16
- 239000004033 plastic Substances 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000000789 fastener Substances 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000002991 molded plastic Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- -1 physically rigid Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 241001052209 Cylinder Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
- F16B5/0258—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread using resiliently deformable sleeves, grommets or inserts
-
- 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
- F16B29/00—Screwed connection with deformation of nut or auxiliary member while fastening
-
- 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
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/04—Screwed connections specially modified in view of tensile load; Break-bolts for maintaining a tensile load
-
- 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
- F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
- F16B2200/97—Constructional details of connections not covered for in other groups of this subclass having differing thermal expansion coefficients
Abstract
DEVICE AND ASSEMBLY FOR MOUNTING PARTS
ABSTRACT OF THE DISCLOSURE
An improved assembly for mounting a part onto a base member is provided by incorporating a tubular insert having a hollow inner core in a mounting hole in the part. A fastener, such as a bolt or machine screw, may then be inserted through the insert in the mount-ing hole for attachment to the base member. When the assembly is subjected to axial compression by the fastener, the insert collapses uniformly in an axial direction to absorb a substantial amount of the total compressive load exerted upon tightening the fastener.
ABSTRACT OF THE DISCLOSURE
An improved assembly for mounting a part onto a base member is provided by incorporating a tubular insert having a hollow inner core in a mounting hole in the part. A fastener, such as a bolt or machine screw, may then be inserted through the insert in the mount-ing hole for attachment to the base member. When the assembly is subjected to axial compression by the fastener, the insert collapses uniformly in an axial direction to absorb a substantial amount of the total compressive load exerted upon tightening the fastener.
Description
``` ~.~15~ ~
BACKGROUND OF THE I~ TIO,`~
This invention relates to a substantially tubular insert which is capable of collapsing in an axial direction in response to a com-pressive force exerted by a fastening elemont, and to an assembly incorporating said insert as an integral com?onent thereof. Upon compression of the insert, a considerable`portion of the net com-pressive load exerted by the fastener is absorbed by the insert without excessive loading on the article.
As is well-known in the fastener ar~, the problem of maintaining adequate compression or torque when assembling metal or non-metal parts to other assemblies having dissimilar coefficients of thermal expansion has persisted in industry for many years and has pre-viously denied the acceptance of materials in fields of application in which they would otherwise find great utility. A part which is subjected to a compressive load due to the clamping action of a fastener will tend to de~orm over a perio~ of time, as a result of a condition kno~:~n as "cold flow", i.e. pemanent deformation resulting from prolonged application of a stress belo~-~ the elastic limit of a material. This condition is further aggraYated ~hen an assembly is thermally cycled and the part tends to undergo a greater expansion than the metal fastener will permit due to the dissimilarities in thermal expansion coefficients. This is especially true, for in-stance, in the automotive industry where assemblies are frequently exposed to severe temperature cycles during ~hich the materials are alternately subjected to thermal expansion and contraction.
In the past, various types of inserts have been employed in plastic articles either by press-fitting ~he insert into a finished molding or by placing the insert in the cavity so that it becomes an integral part of the molding. Typical inserts of this type 30 include a ~ide variety of internally threaded bushings used for attaching a molded plastic article to another object. By way of example, U. S. Patent 2,591,575 to McCollum, describes an internally-threaded, expandable fastener insert for use in molded plastic articles adapted to be anchored to the plastic article by means of 35 which other parts may be fastened thereto.
This and other similar prior art inserts are distinguished from the insert of the present invention which is not internally threaded to engage a fastener and is not adapted to anchor the part by expanding outwardly in a radial direction in response to compressive loading by a fastener. Rather, the insert of this invention is designed to collapse uniformly in an axial direction with-out exerting lateral forces on the part due to lateral motion of the external surface. In this manner, the insert described herein will prevent substantial defor-mation of the part while maintaining the specified com-pressive loading on the assembly.
Accordingly, it is a principal object of the instant invention to provide a means for mounting parts onto a workpiece by employing a collapsible tubular insert in the part which is adapted to absorb a sub-stantial amount of the total compressive load exerted upon tightening a fastener.
In accordance with one aspect of the invention there is provided a tubular insert adapted for use in mounting a part onto a base member, said insert having a hollow inner core for receiving a fastener and further having at least one annular groove formed around the external surface thereof to permit said insert to collapse uniformly in an axial direction responsive to a compressive force exerted in an axial direction against the end of said insert, whereby a substantial portion of said compressive force is absorbed by said insert.
In another aspect of the invention there is provided an assembly for mounting parts onto a base member, said assembly comprising (1) a part having a lower surface for attachment to a base member and a mounting hole for receiving a fastener, and (2) a tubu-lar insert of the invention engaged in said mounting hole, the lower end surface of said insert being in substantial alignment with the lower surface of the part, and the upper end surface of said insert projecting out-ward from the upper surface of the part. The insert , ~
_ 3 ~ 5 ~
collapses uniformly in the axial direction responsive to the compressive force exerted by the fastener to absorb a substantial portion of the compressive force upon tightening the fastener.
In particular the assembly of the invention comprises a part which may be formed from plastic, wood, or a metal having a higher coefficient of expansion than steel, and a hollow cylindrical insert. The part is provided with a mounting hole which is sized to accomo-date the insert. The insert is sized so that it is securely engaged in the mounting hole, the engagement being provided by fitting the insert in the mounting hole after molding or machining the part. It is also essential that the length of the insert exceed the thick-ness of the part so that the upper end surface of the insert can extend beyond the upper surface of the part to provide the initial engagement with the fastener.
In order to permit the insert to collapse uni-formly in an axial direction, relative to the axis of symmetry of the insert, the insert may be provided with an annular groove formed along its external surface.
There may be a single groove or a plurality of grooves or, in an alternate embodiment, the cylinder walls may be formed into evenly-spaced corrugations. They may have a rounded, triangular, rectangular or squared cross-section, although a ~n E~
~15~
rounded cross-section is preFerred. In an especially preferred embodiment, the groove is designed with a centrally disposed annular bulge or ridge, as shown in Fig. 1 and Fig. 2.
While the groove may have a variety of configurations, the 5 depth of the groove is significant since the thickness of the cylin-der wall at the grooved section determines the compressive load necessary to cause the insert to collapse. This collapsed load is somewhat less than the total rated compressive load for the assembly.
Thus, the insert is caused to collapse until its upper end surface 10 is in substantial alignment with the upper surface nF the part. In this configuration, the washer, if one is employed, makes physical contact with both the insert and the part. As the fastener is tightened further until the total rated compressive load for the assembly is reached, the insert absorbs a substantial amount of 15 total load applied by the fastener.
In addition, the insert is adapted to collapse uniformly in an axial direction without outward lateral motion of the cylinder walls into the part. Thus, the insert does not exert forces on the part which could result in excessive stress and deformation.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a sectional view of the assembly prior to the application of compressive loading.
Fig. 2 is a sectional view of the assembly of Fig. 1 after applying compressive force.
Fig. 3 is a sectional view analogous to Fig. 1 but illus-trating an alternate groove design for the insert.
Fig. 4 is a sectional view analogous to Fig. 1 but illus-trating an alternate insert configuration.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figure 1 shows the hollow cylindrical insert 2 engaged in a mounting hole in part 14. The insert 2 is provided with an annular groove 4 formed along external wall surface 6, and an in-ternal wall surface 8 of uniform diameter. In this particular embodiment, the groove design incorporates an annular ridge 5 formed within the groove. The insert 2 is also provided with a lower end surface 10, which is substantially aligne(l with the lower surface 18 of part 14, and an upper end surface 12 extending beyond the upper surface 16 of said part. Fas-tener element 20, with washer 22, is shown aligned through the insert 2, engaging the upper end surface 12 of the insert and base member 24.
Figure 2 shows the fastener assembly embodied in Figure 1 with the insert 2 depicted in a collapsed condition, wherein the upper end surface 12 thereof is in substantial alignment with the upper surface 16 of part 14, and the washer 22 is in contact with both the upper end sur-face 12 of the insert and the upper surface 16 of the part.
Annular ridge 5 is shown with an outward fold or crease relative to the axis of symmetry of the insert. It should, how-ever, be noted that while Figure 2 is intended to illustrate a typical compressed or collapsed configuration, this invention is not limited to any particular collapsed configuration. Thus, the ridge 5 may, in a particular instance, be caused to fold inward if desired.
Figure 3 illustrates another embodiment of the assembly of Figure 1 with insert 32 having lower end surface 40, upper end surface 39, internal wall surface 38 of substantially uniform diameter, and a substantially rounded annular groove 34 formed along the external wall surface 36.
Figure 4 shows a further embodiment of the assembly of Figure 1 wherein insert 42, having a lower end surface 50, an upper end surface 49, internal wall surface 48, and external wall surface 46, said insert being provided with a multiplicity of evenly-spaced annular corrugations on both the internal and ex-ternal wall surfaces.
The insert may be fabricated of any suitable materials which satisfy the performance criteria. Suitable materials include, but are not limited to, metallic materials, including steel, brass, ;i3 and aluminum, and the like, as well as plastic materials, such as nylon. The ternn "plastic", as employed in the instant specification and claims, is intended to denote a molded synthetic polymer, including both the thermoplastic and thermosetting varieties, which may be cured to a hardened state. A typical example of such a molded plastic material is a phenolic resin.
It is also contemplated that the base member may be formed of any solid, i.e. physically rigid, material such as, for example, plastic, metal, concrete, wood, glass, and the like.
The types of fasteners which may be employed in this invention are conventional and include bolts, machine screws, wood screws and the like, with the only limitation being that the particular fastener be compatible with the base member and be capable of collapsing the insert. The fastener is preferably fabricated from metal, especially steel, and may or may not include a washer.
The article or part to be attached to the base member may be formed from any physically rigid material having a higher coefficient of thermal expansion than the fastener material, and would therefore include materials such as plastic, wood, metals such as aluminum, and the like. In a preferred embodiment, the part is fabricated from a plastic material derived from a phenolic resin and various filler materials.
Although the insert has been described in terms of the various groove configurations embodied in the drawings, it is not intended thereby to limit the types of inserts which may be employed herein.
Of those particular embodiments shown, however, the configuration provided in Figures 1 and 2 is most preferred since it is less likely to crack or fracture at the grooved section.
The novel assembly of this invention is useful in a number of 30 applications, particularly in those environments where the assembly is subjected to repeated fluctuations in temperature. As a specific example, an article such as a plastic component for an internal combustion engine, such as a plastic water pump, could be mounted directly to the engine block by employing the insert device as 35 provided herein.
'3 While this inven-tion has been illustrated and described in terms of particular embodiments thereof, it is not intended to be limited to the details shown, since various modifications and changes may be made without departing in any way from the spirit of the present invention.
BACKGROUND OF THE I~ TIO,`~
This invention relates to a substantially tubular insert which is capable of collapsing in an axial direction in response to a com-pressive force exerted by a fastening elemont, and to an assembly incorporating said insert as an integral com?onent thereof. Upon compression of the insert, a considerable`portion of the net com-pressive load exerted by the fastener is absorbed by the insert without excessive loading on the article.
As is well-known in the fastener ar~, the problem of maintaining adequate compression or torque when assembling metal or non-metal parts to other assemblies having dissimilar coefficients of thermal expansion has persisted in industry for many years and has pre-viously denied the acceptance of materials in fields of application in which they would otherwise find great utility. A part which is subjected to a compressive load due to the clamping action of a fastener will tend to de~orm over a perio~ of time, as a result of a condition kno~:~n as "cold flow", i.e. pemanent deformation resulting from prolonged application of a stress belo~-~ the elastic limit of a material. This condition is further aggraYated ~hen an assembly is thermally cycled and the part tends to undergo a greater expansion than the metal fastener will permit due to the dissimilarities in thermal expansion coefficients. This is especially true, for in-stance, in the automotive industry where assemblies are frequently exposed to severe temperature cycles during ~hich the materials are alternately subjected to thermal expansion and contraction.
In the past, various types of inserts have been employed in plastic articles either by press-fitting ~he insert into a finished molding or by placing the insert in the cavity so that it becomes an integral part of the molding. Typical inserts of this type 30 include a ~ide variety of internally threaded bushings used for attaching a molded plastic article to another object. By way of example, U. S. Patent 2,591,575 to McCollum, describes an internally-threaded, expandable fastener insert for use in molded plastic articles adapted to be anchored to the plastic article by means of 35 which other parts may be fastened thereto.
This and other similar prior art inserts are distinguished from the insert of the present invention which is not internally threaded to engage a fastener and is not adapted to anchor the part by expanding outwardly in a radial direction in response to compressive loading by a fastener. Rather, the insert of this invention is designed to collapse uniformly in an axial direction with-out exerting lateral forces on the part due to lateral motion of the external surface. In this manner, the insert described herein will prevent substantial defor-mation of the part while maintaining the specified com-pressive loading on the assembly.
Accordingly, it is a principal object of the instant invention to provide a means for mounting parts onto a workpiece by employing a collapsible tubular insert in the part which is adapted to absorb a sub-stantial amount of the total compressive load exerted upon tightening a fastener.
In accordance with one aspect of the invention there is provided a tubular insert adapted for use in mounting a part onto a base member, said insert having a hollow inner core for receiving a fastener and further having at least one annular groove formed around the external surface thereof to permit said insert to collapse uniformly in an axial direction responsive to a compressive force exerted in an axial direction against the end of said insert, whereby a substantial portion of said compressive force is absorbed by said insert.
In another aspect of the invention there is provided an assembly for mounting parts onto a base member, said assembly comprising (1) a part having a lower surface for attachment to a base member and a mounting hole for receiving a fastener, and (2) a tubu-lar insert of the invention engaged in said mounting hole, the lower end surface of said insert being in substantial alignment with the lower surface of the part, and the upper end surface of said insert projecting out-ward from the upper surface of the part. The insert , ~
_ 3 ~ 5 ~
collapses uniformly in the axial direction responsive to the compressive force exerted by the fastener to absorb a substantial portion of the compressive force upon tightening the fastener.
In particular the assembly of the invention comprises a part which may be formed from plastic, wood, or a metal having a higher coefficient of expansion than steel, and a hollow cylindrical insert. The part is provided with a mounting hole which is sized to accomo-date the insert. The insert is sized so that it is securely engaged in the mounting hole, the engagement being provided by fitting the insert in the mounting hole after molding or machining the part. It is also essential that the length of the insert exceed the thick-ness of the part so that the upper end surface of the insert can extend beyond the upper surface of the part to provide the initial engagement with the fastener.
In order to permit the insert to collapse uni-formly in an axial direction, relative to the axis of symmetry of the insert, the insert may be provided with an annular groove formed along its external surface.
There may be a single groove or a plurality of grooves or, in an alternate embodiment, the cylinder walls may be formed into evenly-spaced corrugations. They may have a rounded, triangular, rectangular or squared cross-section, although a ~n E~
~15~
rounded cross-section is preFerred. In an especially preferred embodiment, the groove is designed with a centrally disposed annular bulge or ridge, as shown in Fig. 1 and Fig. 2.
While the groove may have a variety of configurations, the 5 depth of the groove is significant since the thickness of the cylin-der wall at the grooved section determines the compressive load necessary to cause the insert to collapse. This collapsed load is somewhat less than the total rated compressive load for the assembly.
Thus, the insert is caused to collapse until its upper end surface 10 is in substantial alignment with the upper surface nF the part. In this configuration, the washer, if one is employed, makes physical contact with both the insert and the part. As the fastener is tightened further until the total rated compressive load for the assembly is reached, the insert absorbs a substantial amount of 15 total load applied by the fastener.
In addition, the insert is adapted to collapse uniformly in an axial direction without outward lateral motion of the cylinder walls into the part. Thus, the insert does not exert forces on the part which could result in excessive stress and deformation.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a sectional view of the assembly prior to the application of compressive loading.
Fig. 2 is a sectional view of the assembly of Fig. 1 after applying compressive force.
Fig. 3 is a sectional view analogous to Fig. 1 but illus-trating an alternate groove design for the insert.
Fig. 4 is a sectional view analogous to Fig. 1 but illus-trating an alternate insert configuration.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figure 1 shows the hollow cylindrical insert 2 engaged in a mounting hole in part 14. The insert 2 is provided with an annular groove 4 formed along external wall surface 6, and an in-ternal wall surface 8 of uniform diameter. In this particular embodiment, the groove design incorporates an annular ridge 5 formed within the groove. The insert 2 is also provided with a lower end surface 10, which is substantially aligne(l with the lower surface 18 of part 14, and an upper end surface 12 extending beyond the upper surface 16 of said part. Fas-tener element 20, with washer 22, is shown aligned through the insert 2, engaging the upper end surface 12 of the insert and base member 24.
Figure 2 shows the fastener assembly embodied in Figure 1 with the insert 2 depicted in a collapsed condition, wherein the upper end surface 12 thereof is in substantial alignment with the upper surface 16 of part 14, and the washer 22 is in contact with both the upper end sur-face 12 of the insert and the upper surface 16 of the part.
Annular ridge 5 is shown with an outward fold or crease relative to the axis of symmetry of the insert. It should, how-ever, be noted that while Figure 2 is intended to illustrate a typical compressed or collapsed configuration, this invention is not limited to any particular collapsed configuration. Thus, the ridge 5 may, in a particular instance, be caused to fold inward if desired.
Figure 3 illustrates another embodiment of the assembly of Figure 1 with insert 32 having lower end surface 40, upper end surface 39, internal wall surface 38 of substantially uniform diameter, and a substantially rounded annular groove 34 formed along the external wall surface 36.
Figure 4 shows a further embodiment of the assembly of Figure 1 wherein insert 42, having a lower end surface 50, an upper end surface 49, internal wall surface 48, and external wall surface 46, said insert being provided with a multiplicity of evenly-spaced annular corrugations on both the internal and ex-ternal wall surfaces.
The insert may be fabricated of any suitable materials which satisfy the performance criteria. Suitable materials include, but are not limited to, metallic materials, including steel, brass, ;i3 and aluminum, and the like, as well as plastic materials, such as nylon. The ternn "plastic", as employed in the instant specification and claims, is intended to denote a molded synthetic polymer, including both the thermoplastic and thermosetting varieties, which may be cured to a hardened state. A typical example of such a molded plastic material is a phenolic resin.
It is also contemplated that the base member may be formed of any solid, i.e. physically rigid, material such as, for example, plastic, metal, concrete, wood, glass, and the like.
The types of fasteners which may be employed in this invention are conventional and include bolts, machine screws, wood screws and the like, with the only limitation being that the particular fastener be compatible with the base member and be capable of collapsing the insert. The fastener is preferably fabricated from metal, especially steel, and may or may not include a washer.
The article or part to be attached to the base member may be formed from any physically rigid material having a higher coefficient of thermal expansion than the fastener material, and would therefore include materials such as plastic, wood, metals such as aluminum, and the like. In a preferred embodiment, the part is fabricated from a plastic material derived from a phenolic resin and various filler materials.
Although the insert has been described in terms of the various groove configurations embodied in the drawings, it is not intended thereby to limit the types of inserts which may be employed herein.
Of those particular embodiments shown, however, the configuration provided in Figures 1 and 2 is most preferred since it is less likely to crack or fracture at the grooved section.
The novel assembly of this invention is useful in a number of 30 applications, particularly in those environments where the assembly is subjected to repeated fluctuations in temperature. As a specific example, an article such as a plastic component for an internal combustion engine, such as a plastic water pump, could be mounted directly to the engine block by employing the insert device as 35 provided herein.
'3 While this inven-tion has been illustrated and described in terms of particular embodiments thereof, it is not intended to be limited to the details shown, since various modifications and changes may be made without departing in any way from the spirit of the present invention.
Claims
THE EMOBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR
PRIVILEGE IS CLAIMED IS DEFINED AS FOLLOWS:
A tubular insert adapted for use in mounting a part onto a base member, said insert having a hollow inner core for receiving a fas-tener and further having at least one annular groove formed around the external cylindrical surface thereof to permit said insert to collapse uniformly in an axial direction responsive to a compressive force exerted in an axial direction against the end of said insert, whereby a substantial portion of said compressive force is absorbed by said insert.
The insert of Claim 1 wherein said groove has an annular ridge in the central portion thereof.
The insert of Claim 1 which has a substantially uniform wall thickness and a plurality of evenly-spaced annular corrugations.
The insert of Claim 1 formed from a metal.
An assembly for mounting parts onto a base member, said assembly comprising (1) a part having a lower surface for attachment to a base member and a mounting hole for receiving a fastener, and (2) a tubu-lar insert engaged in said mounting hole, the lower end surface of said insert being in substantial alignment with the lower surface of the part, and the upper end surface of said insert projecting outward from the upper surface of the part, said insert having a hollow inner core for receiving a fastener and further having at least one annular groove formed along the external surface thereof to permit said in-sert to collapse uniformly in an axial direction responsive to a compressive force exerted by the fastener to absorb a substantial portion of said compressive force upon tightening the fastener.
The assembly of Claim 5 wherein the groove in said insert has an annular ridge in the central portion thereof.
The assembly of Claim 5 wherein the part is fabricated from a plastic material.
The assembly of Claim 5 wherein the part is fabricated from a metallic material having a higher coefficient of thermal expansion than the fastener material.
An assembly for mounting parts onto a base member, said assembly comprising (1) a part having a lower surface for attachment to a base member and a mounting hole for receiving a fastener, said part comprising a rigid solid having a higher coefficient of expansion than the fastener material, and (2) a metallic tubular insert en-gaged in said mounting hole, said insert having a substantially uniform wall thickness and a plurality of evenly-spaced annular corrugations, the lower end surface of said insert being in substan-tial alignment with the lower surface of the part, and the upper end surface of said insert projecting outward from the upper surface of the part, said insert having a hollow inner core for receiving a fastener and further being adapted to collapse uniformly in an axial direction responsive to a compressive force exerted by the fastener to absorb a substantial portion of said compressive force upon tightening the fastener.
PRIVILEGE IS CLAIMED IS DEFINED AS FOLLOWS:
A tubular insert adapted for use in mounting a part onto a base member, said insert having a hollow inner core for receiving a fas-tener and further having at least one annular groove formed around the external cylindrical surface thereof to permit said insert to collapse uniformly in an axial direction responsive to a compressive force exerted in an axial direction against the end of said insert, whereby a substantial portion of said compressive force is absorbed by said insert.
The insert of Claim 1 wherein said groove has an annular ridge in the central portion thereof.
The insert of Claim 1 which has a substantially uniform wall thickness and a plurality of evenly-spaced annular corrugations.
The insert of Claim 1 formed from a metal.
An assembly for mounting parts onto a base member, said assembly comprising (1) a part having a lower surface for attachment to a base member and a mounting hole for receiving a fastener, and (2) a tubu-lar insert engaged in said mounting hole, the lower end surface of said insert being in substantial alignment with the lower surface of the part, and the upper end surface of said insert projecting outward from the upper surface of the part, said insert having a hollow inner core for receiving a fastener and further having at least one annular groove formed along the external surface thereof to permit said in-sert to collapse uniformly in an axial direction responsive to a compressive force exerted by the fastener to absorb a substantial portion of said compressive force upon tightening the fastener.
The assembly of Claim 5 wherein the groove in said insert has an annular ridge in the central portion thereof.
The assembly of Claim 5 wherein the part is fabricated from a plastic material.
The assembly of Claim 5 wherein the part is fabricated from a metallic material having a higher coefficient of thermal expansion than the fastener material.
An assembly for mounting parts onto a base member, said assembly comprising (1) a part having a lower surface for attachment to a base member and a mounting hole for receiving a fastener, said part comprising a rigid solid having a higher coefficient of expansion than the fastener material, and (2) a metallic tubular insert en-gaged in said mounting hole, said insert having a substantially uniform wall thickness and a plurality of evenly-spaced annular corrugations, the lower end surface of said insert being in substan-tial alignment with the lower surface of the part, and the upper end surface of said insert projecting outward from the upper surface of the part, said insert having a hollow inner core for receiving a fastener and further being adapted to collapse uniformly in an axial direction responsive to a compressive force exerted by the fastener to absorb a substantial portion of said compressive force upon tightening the fastener.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US83904677A | 1977-10-03 | 1977-10-03 | |
| US839,046 | 1977-10-03 | ||
| US89855578A | 1978-04-21 | 1978-04-21 | |
| US898,555 | 1978-04-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1115100A true CA1115100A (en) | 1981-12-29 |
Family
ID=27126075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA312,558A Expired CA1115100A (en) | 1977-10-03 | 1978-10-03 | Device and assembly for mounting parts |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5460642A (en) |
| AU (1) | AU533332B2 (en) |
| CA (1) | CA1115100A (en) |
| DE (1) | DE2842986A1 (en) |
| FR (1) | FR2404757A1 (en) |
| GB (1) | GB2005371B (en) |
| IT (1) | IT1100814B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55134799A (en) * | 1979-04-07 | 1980-10-20 | Aisin Seiki Co Ltd | Plastic fan for cooling automotive engine |
| GB2038997B (en) * | 1978-11-23 | 1983-05-25 | Aisin Seiki | Fan assemblies |
| DE3632312A1 (en) * | 1986-09-23 | 1988-03-31 | Preh Elektro Feinmechanik | Electrical component which is fixed on a carrier |
| GB8717248D0 (en) * | 1987-07-21 | 1987-08-26 | Bennett A L | Universal bracing clamps |
| DE9011441U1 (en) * | 1990-08-06 | 1990-11-15 | Emhart Inc., Newark, Del., Us | |
| DE4121498A1 (en) * | 1991-06-28 | 1993-01-14 | Audi Ag | Fixing device for two relatively movable components - has small solid bodies filling space between screw shaft and bore wall |
| DE19721894C2 (en) * | 1997-05-26 | 2002-11-21 | Volkswagen Ag | Fitting arrangement for components made of strong creeping material |
| JP2001107922A (en) * | 1999-10-08 | 2001-04-17 | Mitsubishi Heavy Ind Ltd | Fastening structure of flangeless casing |
| FR2903733B1 (en) * | 2006-07-12 | 2011-03-04 | Airbus France | TURBOMOTEUR FOR AIRCRAFT. |
| DE102006053952A1 (en) * | 2006-11-15 | 2008-05-29 | Siemens Ag | Plastic part e.g. intake manifold, fixing device for use in internal-combustion engine, has pressure limiting unit made of duroplastic material including phenol molding material, where phenol molding material is networked by tempering |
| DE102008007776A1 (en) * | 2008-02-06 | 2009-08-13 | Volkswagen Ag | Thermosetting plastic component, has torque limiting unit suitable and equipped for limiting torque that occurs during tightening of assembly screw, where torque limiting unit consists of duroplastic material |
| GB2478308A (en) * | 2010-03-02 | 2011-09-07 | Psm Internat Ltd | Compression limiter assembly |
| DE102010036596A1 (en) | 2010-07-23 | 2012-01-26 | Contitech Vibration Control Gmbh | injection molding |
| US20180340447A1 (en) * | 2017-05-25 | 2018-11-29 | General Electric Company | Crushable spacer and bolted joint for a gas turbine engine |
| JP7047917B2 (en) * | 2018-08-01 | 2022-04-05 | 日本製鉄株式会社 | Brake disc mounting structure for railway vehicles and brake disc units using this |
| DE102021109122A1 (en) | 2021-04-13 | 2022-10-13 | Bayerische Motoren Werke Aktiengesellschaft | Component, method for producing a component and motor vehicle |
| DE102021112870A1 (en) | 2021-05-18 | 2022-11-24 | PROMESS Gesellschaft für Montage- und Prüfsysteme mbH | Compression sleeve for preloading screw connections |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE371782C (en) * | 1921-05-31 | 1923-03-22 | Richard Amberton | Bolts with resilient relief, especially for containers with internal pressure |
| GB1099472A (en) * | 1965-03-11 | 1968-01-17 | Timber Res And Dev Ass | Joints between timber structural members |
| US3657955A (en) * | 1970-05-14 | 1972-04-25 | Thomas L Mckay | Blind fastener with expandable collar |
-
1978
- 1978-09-05 GB GB7835577A patent/GB2005371B/en not_active Expired
- 1978-09-14 AU AU39864/78A patent/AU533332B2/en not_active Expired
- 1978-09-22 IT IT27980/78A patent/IT1100814B/en active
- 1978-09-28 JP JP11984578A patent/JPS5460642A/en active Pending
- 1978-09-29 FR FR7827938A patent/FR2404757A1/en active Granted
- 1978-10-02 DE DE19782842986 patent/DE2842986A1/en not_active Withdrawn
- 1978-10-03 CA CA312,558A patent/CA1115100A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU3986478A (en) | 1980-03-20 |
| FR2404757B1 (en) | 1983-11-04 |
| JPS5460642A (en) | 1979-05-16 |
| IT1100814B (en) | 1985-09-28 |
| GB2005371A (en) | 1979-04-19 |
| FR2404757A1 (en) | 1979-04-27 |
| GB2005371B (en) | 1982-06-30 |
| AU533332B2 (en) | 1983-11-17 |
| DE2842986A1 (en) | 1979-04-12 |
| IT7827980A0 (en) | 1978-09-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |