CA2555118C - Method of forming an expansion mounting sleeve and the product thereof - Google Patents
Method of forming an expansion mounting sleeve and the product thereof Download PDFInfo
- Publication number
- CA2555118C CA2555118C CA2555118A CA2555118A CA2555118C CA 2555118 C CA2555118 C CA 2555118C CA 2555118 A CA2555118 A CA 2555118A CA 2555118 A CA2555118 A CA 2555118A CA 2555118 C CA2555118 C CA 2555118C
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- Canada
- Prior art keywords
- sleeve
- expansion
- mounting sleeve
- bolt
- areas
- Prior art date
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- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 55
- 238000003825 pressing Methods 0.000 claims description 17
- 230000000750 progressive effect Effects 0.000 claims description 6
- 238000009966 trimming Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000010273 cold forging Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910000978 Pb alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
-
- 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
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/02—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose in one piece with protrusions or ridges on the shaft
- F16B13/025—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose in one piece with protrusions or ridges on the shaft of rolled sheet material
-
- 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
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/12—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like
- F16B13/122—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like made from a sheet-metal blank
-
- 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
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/12—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like
- F16B13/124—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like fastened by inserting a threaded element, e.g. screw or bolt
Abstract
An expansion mounting sleeve includes a forward tapered cylindrical body formed by stamping a material strip, and the cylindrical body defines an internally threaded tapered bore. A plurality of engaging teeth having different heights and shapes are formed to project from the cylindrical body. After the sleeve has been driven into or mounted in a hole formed on a wall, a ready-made bolt having length, size, and screw threads matching the threaded bore of the cylindrical body may be screwed into the bore and thereby expands the tapered cylindrical body of the sleeve, causing the engaging teeth to move outward to tightly engage with the wall in the hole and firmly hold the expansion mounting sleeve in place in the hole. A method of forming the expansion mounting sleeve is also provided.
Description
METHOD OF FORMING AN EXPANSION MOUNTING
SLEEVE
AND THE PRODUCT THEREOF
FIELD OF THE INVENTION
The present invention relates to an expansion inounting sleeve, and mot=e particularly to an expansion tnounting sleeve that can be driven or mounted in a hole on a wall and be expanded to firmly locate in the hole when a matching ready-made bolt is screwed thereinto.
BACKGROUND OF TI-IE INVENTION
The currently cominercially available expansion bolt assemblies and associated niounting nuts are manufactured in diffei-ent manners, such as injection molding plastic -naterials, casting zinc, lead, or aluminum alloys, turning cutting rods to form bolts and cold forging pipes to form expansion sleeves, and cold forging rods to fornl bolts and stamping sheet inetal to form expansion sleeves.
All these conventional expansion bolt assemblies and mounting nuts require complicate processing apparatus and a lot of parts, 2 5 as well as relatively high quantity of material to produce them.
And, the conventional expansion bolt assemblies or mounting i nuts tend to fail in fastening because the expansion sleeves thereof fail to expand as desii-ed, causing the bolts or the mounting nuts to idle without being tightened against the expansion sleeves.
Fig. I shows a first conventional expansion mounting screw assembly formed from a plastic mater-ial. The plastic expansion screw assembly has the advantages of low material cost and resistant to rust, but requires high cost foi- molds and has low production speed. The plastic expansion screw assembly also has low rigidity as well as small engaging friction with wall, and accordingly, weak tensile strength and bearing strength. Therefore, the expansion sleeve of the plastic expansion mounting screw assembly tends to be easily pulled out of the wall.
The conventional expansion inounting nuts cast by alloys requii-e longer tiine to produce and involve a lot of tools and processing procedui-es, including tapping, assembling, etc.
2 0 The major disadvantages of the cast alloy expansion mounting nuts include a limiteci range of' usable inaterials and a mechanical strength lower than the pi-oducts made of a cold-rolled metal sti-ip inaterial.
Fig. 2 shows a conventional turning cut expansion sleeve or moutiting nut for an expansion bolt assembly, which requires ~
longei- time to produce a pi-imary body and form gi-ooves on the primary body in secondary processing. A lot of material is waste in turning cut. The turning cut expansion sleeve must be used with a taper-headed bolt to achieve the expansion of the sleeve. Another disadvantage is the tuning cut expansion sleeve is often made of high speed steel, which has ai-esistance too high to allow successful expansion of the sleeve, resulting in idling of the bolt or the nut against the expansion sleeve without effectively achieving the fastening operation. This type of expansion bolt asseinbly is therefore not suitable for use in assembling work pieces, erecting construction works, or assembling DIY (do-it-yourself) products.
A conventional expansion bolt assembly includirig a cold-for-ged metal bolt and a tui-ning cut nietal sleeve is currently most widely used in civil works, restoration, hanging, equiptnent installation and positioning, etc. The bolt is taper-headed, and the sleeve is processed to foi-m slits thereon.
This type of expansion bolt asseinbly also includes a flat wash, an expansion washer, and a nut, and may be handled in two ways. In the first way, first moves the nut to a rear end of the bolt, then, drive the expansion bolt assembly into a hole pre-drilled on a wall surface, and then tighten the nut, so that the taper-headed bolt expands the foi-ced forward slit sleeve.
The sleeve of this type of expansion bolt assembly frequently fails to expand due to a high resistance, i-esulting in idling when the nut is tightened against the bolt. In the second way, fit-st move the nut to a rear end of the bolt, then, drive the expansion bolt assembly into a hole pre-dt-illed on a wall surface, and then release the nut and the expansion washei- from the bolt. Thereafter, use a sleeve larger tlian the bolt to force the slit metal sleeve forward, so that tapered head of the bolt forces the slit metal sleeve to expand and achieve the purpose of tightly fastening the expansion bolt assembly to the wall.
Ho~vever, since the pre-drilled liole is often incorrect in depth, lo or biased, or too soft at the bottom thereof, the metal sleeve tends to inove too inuch forward oi- the bolt tends to idle. In addition, tliis type of expansion bolt assembly includes a lot of associated parts and t-equires good skill to handle it to avoid failut-e in rnoutiting it.
Fig. 3 shows a further conventional expansion bolt assembly that is an iinproved version of the above-desci-ibed type of expansion bolt assembly, and mainly includes a cold-forged bolt and an expansion sleeve fortned by stamping. Forrnitig the expansion sleeve by statnping may advantageously reduce the tnanufactut=ing cost and lower the resistance to expansion so as to increase the engaging friction of the sleeve with the wall.
The stamped expansion sleeve is expanded by forcing or sct-ewing the taper-headed bolt into the sleeve. Tliis improved type of expansion bolt assembly still has the drawbacl<s of including too many parts and requit-ing longer time to assemble the parts together.
It is therefore tried by the inventor to overcome the drawbacks existed in the conventional expansion bolt asseinblies by developing an independent expansion mounting sleeve formed by stamping using progressive dies through simple and less processing procedures, so that the expansion mounting sleeve has the advantages of requiring less material to form it, having an internally threaded bore to ensure tight screwing of a matching ready-made bolt into it to expand the sleeve without the risk of idling, having a plurality of differently sized and shaped and outward protruded engaging teeth to ensure fiim and frictional contact of the expanded sleeve with the wall without the risk of becoming loosened or being pulled out, and largely reducing the tools and costs for manufacturing it.
SUMMARY OF THE INVENTION
It is desirable to provide an expansion mounting sleeve that can be quickly manufactured using a variety of materials with reduced material quantity through simple processing procedures.
It is also desirable to provide an expansion mounting sleeve that can be conveniently used with a ready-made bolt having matching length, size, and screw threads; so that the apparatus and tools needed to produce the expansion mounting sleeve can be largely simplified.
It is further desirable to provide an expansion mounting sleeve that can be easily handled by a person with general skill to successfully coinplete the fastening work within a shortened time period.
It is still further desirable to provide an expansion mounting sleeve that could be efficiently driven into or mounted in a wall without the risk of becoming loosened.
To achieve the above and other objects, the expansion mounting sleeve described herein includes a forward tapered cylindrical body formed by stamping and pressing a cold-rolled metal strip to define an internally threaded tapered bore. A plurality of engaging teeth having different heights and shapes are formed to project from the cylindrical body. After the sleeve has been driven into or mounted in a hole pre-drilled on a wall, a ready-made bolt having length, size, and screw threads matching the threaded bore of the cylindrical body may be screwed into the bore and thereby expands the forward tapered cylindrical body of the sleeve, causing the engaging teeth to extend outward and tightly engage with the wall in the hole, so as to firmly hold the expansion mounting sleeve in place in the hole.
The expansion mounting sleeve described herein is formed by stamping and pressing using progressive dies. A method of manufacturing the expansion mounting sleeve includes the following steps:
(a) preparing a piece of material having dimensions needed to manufacture the expansion mounting sleeve, forming at least two tapered areas on the material, and defining thread forining areas on the material;
(b) pressing the material to form more than one slot in the thread forming areas, such that the slots are parallel to an axis of the material;
(c) pressing the material to form at least one barb and/or more than one outward protruded engaging teeth in each of the tapered areas, the engaging teeth have heights that increase toward a front end of the material;
(d) pressing the material to form screw threads of a desired size in the thread forming areas;
(e) pressing the material to form at least one degree of bending at the tapered areas;
(f) pressing the thread forming areas to form a U-sectioned shape;
(g) further curling the thread forming areas into a circular cross section;
and (h) trimming off unnecessary temporary connecting material belt to complete one unit of the expansion mounting sleeve.
Accordingly, in one aspect of the invention there is provided a method of forming an expansion mounting sleeve by stamping using progressive dies, comprising the steps of preparing a material having dimensions needed to form said expansion mounting sleeve, forming at least two tapered areas on the material such that the at least two tapered areas extend longitudinally in a common direction along a single axis of the material, and defining thread fonning areas on the material;
pressing the material to form more than one slot in said thread forming areas;
pressing the material to form at least one barb and engaging tooth in each of said tapered areas;
pressing the material to form screw threads of a desired size in said thread forming areas;
pressing the material to bend said tapered areas;
pressing said thread forming areas to form a U-sectioned shape;
further curling said thread forming areas into a cylindrical body having a circular cross section; and trimming off unnecessary temporary connecting material belt to complete one unit of said expansion mounting sleeve.
According to another aspect of the invention there is provided an expansion mounting sleeve, comprising a cylindrical body defining an internally threaded bore; said cylindrical body and said bore being tapered from near a rear end toward a front end, and said cylindrical body including at least one engaging tooth at the tapered portion of said cylindrical body, each engaging tooth protruding away from an outer wall surface from a bend lying on an axis extending away from the rear end toward the front end along the bore.
BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein Fig. 1 is a perspective view of a conventional expansion mounting screw assembly;
Fig. 2 is a perspective view of a sleeve of another conventional expansion bolt assembly;
Fig. 3 is a perspective view of a further conventional expansion bolt assembly;
Fig. 4 is a pei-spective view ol- an expansion inountinb sleeve accoi-ding to a preferred einbodiment of the present invention;
Fig. 5 is a perspective view of the expansion mounting sleeve of Fig. 4 with a bolt screwed thei-einto;
Figs. 6 to 9 show the manner of screwing a bolt into a wall surface via the expansion n-iounting sleeve of the pc-esent invention;
Figs. IOA to IOH show the steps included in a method of forming the expansion mounting sleeve of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENTS
Please refer to Fig. 4 that is a perspective view showing an expansion mounting sleeve 10 according to a preferred embodinlent of the present invention. A bolt 40 having suitable length, size, and screw threads for screwing into the expansion mounting sleeve 10 is also shown in Fig. 1. Fig. 5 is a perspective view showing the expansion mounting sleeve 10 with the bolt 40 sci-ewed thereinto. As shown, the expansion mounting sleeve 10 includes a substantially straight cylindrical body fornied by curling a metal material. A
locking means 60 is formed at a joint of two edges of the curled metal material near a rear end of the cylindrical body of the expansion mounting sleeve 10 by way of stamping. The locking means 60 includes an ear section 61 protruded from one of the two joining edges, and a recess section 62 formed on the other joining edge opposite to the ear section 61 for engaging with the latter and thereby lock the two joining edges together (also refer to FIG. l0A). The cylindrical body of the sleeve 10 defines a bore 12, which is internally provided with a plurality of screw threads 14. The cylindrical body and the bore 12 of the sleeve 10 are tapered toward a front end the sleeve 10, and at least one engaging tooth 16 is projected from an outer surface of the sleeve 10. In the illustrated embodiment, a plurality of engaging teeth 16, 17, 18 having different lengths and shapes are projected from the outer surface of the sleeve 10. As shown in the figures, each one of the engaging teeth 16, 17, 18 protrudes away from an outer wall surface of the cylindrical body from a bend lying on an axis extending away from the front end toward an opposite rear end along the bore Moreover, one or more stopping tooth elements 20 are forrned on the cylindrical body of the sleeve 10 (see FIG. 6).
FIGS. 6 to 9 are sectional views and partially sectioned views showing the manner of fastening a bolt to a hole 51 on a wall 50 via the expansion mounting sleeve 10, and the state in which the expansion mounting sleeve 10 is firmly pressed against an inner surface of the hole 51. As shown, the wall 50 is pre-drilled to provide the hole 51 for fitly receiving the expansion mounting sleeve 10 therein. Then, a bolt 40 having length, size, and screw threads matching the internal screw threads 14 is screwed into the bore 12 of the sleeve 10. When the bolt 40 is moved forward along the screw threads 14, it also pushes against the forward tapered bore 12, and thereby forces the forward tapered cylindrical body of the sleeve 10 to expand outward. At this point, the engaging teeth 17, 18, 19 are caused by the altered taper of the sleeve 10 to move outward like a stretched umbrella and therefore tightly engage with the wall of the hole 51 and hold the sleeve 10 in place in the hole 51.
The expansion mounting sleeve 10 of the present invention is formed by stainping using progressive dies. FIGS. 10A to 10H show in concrete the steps of forming the expansion mounting sleeve 10. First, prepare a material having dimensions required to produce the expansion mounting sleeve 10, and then form two or more tapered areas 22 on the material extending parallel to one another along an axis of the material in a common direction from a portion of the material interconnecting the tapered areas 22, as shown in FIG. IOA. Then, press the material in pre-defined thread forming areas 24 to form one or more slots 26 parallel to the axis of the material, as shown in FIG. I OB. Then, press the material again to form a barb 30 and/or more than one engaging tooth 16, 17, 18 in the tapered areas 22. It is noted the engaging teeth 16, 17, 18 have different heights which increase toward a front end of the tapered areas. The engaging teeth 16, 17, 18 are then bent toward an outer side of the material, as shown in FIG. 10C. Thereafter, press the material at the thread forming areas 24 to form screw threads 14 having a required size, as shown in Fig. IOD. The material is then pressed at the tapered areas 22 to form at least 1 degree of bending, as shown in Fig. 10E.
After the above steps are completed, the material is further stamped, so that the thread forming a--eas 24 are pressed into a U-sectioned shape, as showri in Fig. 10F. Then, the thread forming areas 14 are further curled, so that the whole material 1o has a cross section appi-oximate to a circle, as shown in Fig.
IOG. When the thread forming areas 24 ai-e fully curled to form a cylindrical body having a circular cross section, a locking structure 60, which consists of an ear section 61 and a recess section 62 correspondingly formed at two opposite edges of the material near a rear end thei-eof, is locl:ed to hold the curled material in the formed cylindrical body, as shown in Fig.
IOH. Finally, trim off the temporary connecting belt of material to obtain a finished product of'the expansion mounting sleeve 10.
F1-om the above desci-ibed steps, it can be found that the expansion mounting sleeve 10 of the present invention is integrally foi-med by employing the existing well matured stamping and press forming techniques and designing high-precision pr-ogressive dies, and using the widely available matei-ials. The expansion mounting sleeve 10 has the following advantages:
(1) The loclcing structure 60 effectively prevents the rear end of the cylindrical body of the sleeve 10 from being expanded and becoming loosened when the bolt 40 is sci-ewed into the screw thi-eads 14 froin the rear end of the sleeve 10.
(2) The one or inore stopping tooth areas 20 effectively prevent the sleeve 10 mounted in the hole 51 from rotating when the bolt 40 is initially screwed thei-einto.
SLEEVE
AND THE PRODUCT THEREOF
FIELD OF THE INVENTION
The present invention relates to an expansion inounting sleeve, and mot=e particularly to an expansion tnounting sleeve that can be driven or mounted in a hole on a wall and be expanded to firmly locate in the hole when a matching ready-made bolt is screwed thereinto.
BACKGROUND OF TI-IE INVENTION
The currently cominercially available expansion bolt assemblies and associated niounting nuts are manufactured in diffei-ent manners, such as injection molding plastic -naterials, casting zinc, lead, or aluminum alloys, turning cutting rods to form bolts and cold forging pipes to form expansion sleeves, and cold forging rods to fornl bolts and stamping sheet inetal to form expansion sleeves.
All these conventional expansion bolt assemblies and mounting nuts require complicate processing apparatus and a lot of parts, 2 5 as well as relatively high quantity of material to produce them.
And, the conventional expansion bolt assemblies or mounting i nuts tend to fail in fastening because the expansion sleeves thereof fail to expand as desii-ed, causing the bolts or the mounting nuts to idle without being tightened against the expansion sleeves.
Fig. I shows a first conventional expansion mounting screw assembly formed from a plastic mater-ial. The plastic expansion screw assembly has the advantages of low material cost and resistant to rust, but requires high cost foi- molds and has low production speed. The plastic expansion screw assembly also has low rigidity as well as small engaging friction with wall, and accordingly, weak tensile strength and bearing strength. Therefore, the expansion sleeve of the plastic expansion mounting screw assembly tends to be easily pulled out of the wall.
The conventional expansion inounting nuts cast by alloys requii-e longer tiine to produce and involve a lot of tools and processing procedui-es, including tapping, assembling, etc.
2 0 The major disadvantages of the cast alloy expansion mounting nuts include a limiteci range of' usable inaterials and a mechanical strength lower than the pi-oducts made of a cold-rolled metal sti-ip inaterial.
Fig. 2 shows a conventional turning cut expansion sleeve or moutiting nut for an expansion bolt assembly, which requires ~
longei- time to produce a pi-imary body and form gi-ooves on the primary body in secondary processing. A lot of material is waste in turning cut. The turning cut expansion sleeve must be used with a taper-headed bolt to achieve the expansion of the sleeve. Another disadvantage is the tuning cut expansion sleeve is often made of high speed steel, which has ai-esistance too high to allow successful expansion of the sleeve, resulting in idling of the bolt or the nut against the expansion sleeve without effectively achieving the fastening operation. This type of expansion bolt asseinbly is therefore not suitable for use in assembling work pieces, erecting construction works, or assembling DIY (do-it-yourself) products.
A conventional expansion bolt assembly includirig a cold-for-ged metal bolt and a tui-ning cut nietal sleeve is currently most widely used in civil works, restoration, hanging, equiptnent installation and positioning, etc. The bolt is taper-headed, and the sleeve is processed to foi-m slits thereon.
This type of expansion bolt asseinbly also includes a flat wash, an expansion washer, and a nut, and may be handled in two ways. In the first way, first moves the nut to a rear end of the bolt, then, drive the expansion bolt assembly into a hole pre-drilled on a wall surface, and then tighten the nut, so that the taper-headed bolt expands the foi-ced forward slit sleeve.
The sleeve of this type of expansion bolt assembly frequently fails to expand due to a high resistance, i-esulting in idling when the nut is tightened against the bolt. In the second way, fit-st move the nut to a rear end of the bolt, then, drive the expansion bolt assembly into a hole pre-dt-illed on a wall surface, and then release the nut and the expansion washei- from the bolt. Thereafter, use a sleeve larger tlian the bolt to force the slit metal sleeve forward, so that tapered head of the bolt forces the slit metal sleeve to expand and achieve the purpose of tightly fastening the expansion bolt assembly to the wall.
Ho~vever, since the pre-drilled liole is often incorrect in depth, lo or biased, or too soft at the bottom thereof, the metal sleeve tends to inove too inuch forward oi- the bolt tends to idle. In addition, tliis type of expansion bolt assembly includes a lot of associated parts and t-equires good skill to handle it to avoid failut-e in rnoutiting it.
Fig. 3 shows a further conventional expansion bolt assembly that is an iinproved version of the above-desci-ibed type of expansion bolt assembly, and mainly includes a cold-forged bolt and an expansion sleeve fortned by stamping. Forrnitig the expansion sleeve by statnping may advantageously reduce the tnanufactut=ing cost and lower the resistance to expansion so as to increase the engaging friction of the sleeve with the wall.
The stamped expansion sleeve is expanded by forcing or sct-ewing the taper-headed bolt into the sleeve. Tliis improved type of expansion bolt assembly still has the drawbacl<s of including too many parts and requit-ing longer time to assemble the parts together.
It is therefore tried by the inventor to overcome the drawbacks existed in the conventional expansion bolt asseinblies by developing an independent expansion mounting sleeve formed by stamping using progressive dies through simple and less processing procedures, so that the expansion mounting sleeve has the advantages of requiring less material to form it, having an internally threaded bore to ensure tight screwing of a matching ready-made bolt into it to expand the sleeve without the risk of idling, having a plurality of differently sized and shaped and outward protruded engaging teeth to ensure fiim and frictional contact of the expanded sleeve with the wall without the risk of becoming loosened or being pulled out, and largely reducing the tools and costs for manufacturing it.
SUMMARY OF THE INVENTION
It is desirable to provide an expansion mounting sleeve that can be quickly manufactured using a variety of materials with reduced material quantity through simple processing procedures.
It is also desirable to provide an expansion mounting sleeve that can be conveniently used with a ready-made bolt having matching length, size, and screw threads; so that the apparatus and tools needed to produce the expansion mounting sleeve can be largely simplified.
It is further desirable to provide an expansion mounting sleeve that can be easily handled by a person with general skill to successfully coinplete the fastening work within a shortened time period.
It is still further desirable to provide an expansion mounting sleeve that could be efficiently driven into or mounted in a wall without the risk of becoming loosened.
To achieve the above and other objects, the expansion mounting sleeve described herein includes a forward tapered cylindrical body formed by stamping and pressing a cold-rolled metal strip to define an internally threaded tapered bore. A plurality of engaging teeth having different heights and shapes are formed to project from the cylindrical body. After the sleeve has been driven into or mounted in a hole pre-drilled on a wall, a ready-made bolt having length, size, and screw threads matching the threaded bore of the cylindrical body may be screwed into the bore and thereby expands the forward tapered cylindrical body of the sleeve, causing the engaging teeth to extend outward and tightly engage with the wall in the hole, so as to firmly hold the expansion mounting sleeve in place in the hole.
The expansion mounting sleeve described herein is formed by stamping and pressing using progressive dies. A method of manufacturing the expansion mounting sleeve includes the following steps:
(a) preparing a piece of material having dimensions needed to manufacture the expansion mounting sleeve, forming at least two tapered areas on the material, and defining thread forining areas on the material;
(b) pressing the material to form more than one slot in the thread forming areas, such that the slots are parallel to an axis of the material;
(c) pressing the material to form at least one barb and/or more than one outward protruded engaging teeth in each of the tapered areas, the engaging teeth have heights that increase toward a front end of the material;
(d) pressing the material to form screw threads of a desired size in the thread forming areas;
(e) pressing the material to form at least one degree of bending at the tapered areas;
(f) pressing the thread forming areas to form a U-sectioned shape;
(g) further curling the thread forming areas into a circular cross section;
and (h) trimming off unnecessary temporary connecting material belt to complete one unit of the expansion mounting sleeve.
Accordingly, in one aspect of the invention there is provided a method of forming an expansion mounting sleeve by stamping using progressive dies, comprising the steps of preparing a material having dimensions needed to form said expansion mounting sleeve, forming at least two tapered areas on the material such that the at least two tapered areas extend longitudinally in a common direction along a single axis of the material, and defining thread fonning areas on the material;
pressing the material to form more than one slot in said thread forming areas;
pressing the material to form at least one barb and engaging tooth in each of said tapered areas;
pressing the material to form screw threads of a desired size in said thread forming areas;
pressing the material to bend said tapered areas;
pressing said thread forming areas to form a U-sectioned shape;
further curling said thread forming areas into a cylindrical body having a circular cross section; and trimming off unnecessary temporary connecting material belt to complete one unit of said expansion mounting sleeve.
According to another aspect of the invention there is provided an expansion mounting sleeve, comprising a cylindrical body defining an internally threaded bore; said cylindrical body and said bore being tapered from near a rear end toward a front end, and said cylindrical body including at least one engaging tooth at the tapered portion of said cylindrical body, each engaging tooth protruding away from an outer wall surface from a bend lying on an axis extending away from the rear end toward the front end along the bore.
BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein Fig. 1 is a perspective view of a conventional expansion mounting screw assembly;
Fig. 2 is a perspective view of a sleeve of another conventional expansion bolt assembly;
Fig. 3 is a perspective view of a further conventional expansion bolt assembly;
Fig. 4 is a pei-spective view ol- an expansion inountinb sleeve accoi-ding to a preferred einbodiment of the present invention;
Fig. 5 is a perspective view of the expansion mounting sleeve of Fig. 4 with a bolt screwed thei-einto;
Figs. 6 to 9 show the manner of screwing a bolt into a wall surface via the expansion n-iounting sleeve of the pc-esent invention;
Figs. IOA to IOH show the steps included in a method of forming the expansion mounting sleeve of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENTS
Please refer to Fig. 4 that is a perspective view showing an expansion mounting sleeve 10 according to a preferred embodinlent of the present invention. A bolt 40 having suitable length, size, and screw threads for screwing into the expansion mounting sleeve 10 is also shown in Fig. 1. Fig. 5 is a perspective view showing the expansion mounting sleeve 10 with the bolt 40 sci-ewed thereinto. As shown, the expansion mounting sleeve 10 includes a substantially straight cylindrical body fornied by curling a metal material. A
locking means 60 is formed at a joint of two edges of the curled metal material near a rear end of the cylindrical body of the expansion mounting sleeve 10 by way of stamping. The locking means 60 includes an ear section 61 protruded from one of the two joining edges, and a recess section 62 formed on the other joining edge opposite to the ear section 61 for engaging with the latter and thereby lock the two joining edges together (also refer to FIG. l0A). The cylindrical body of the sleeve 10 defines a bore 12, which is internally provided with a plurality of screw threads 14. The cylindrical body and the bore 12 of the sleeve 10 are tapered toward a front end the sleeve 10, and at least one engaging tooth 16 is projected from an outer surface of the sleeve 10. In the illustrated embodiment, a plurality of engaging teeth 16, 17, 18 having different lengths and shapes are projected from the outer surface of the sleeve 10. As shown in the figures, each one of the engaging teeth 16, 17, 18 protrudes away from an outer wall surface of the cylindrical body from a bend lying on an axis extending away from the front end toward an opposite rear end along the bore Moreover, one or more stopping tooth elements 20 are forrned on the cylindrical body of the sleeve 10 (see FIG. 6).
FIGS. 6 to 9 are sectional views and partially sectioned views showing the manner of fastening a bolt to a hole 51 on a wall 50 via the expansion mounting sleeve 10, and the state in which the expansion mounting sleeve 10 is firmly pressed against an inner surface of the hole 51. As shown, the wall 50 is pre-drilled to provide the hole 51 for fitly receiving the expansion mounting sleeve 10 therein. Then, a bolt 40 having length, size, and screw threads matching the internal screw threads 14 is screwed into the bore 12 of the sleeve 10. When the bolt 40 is moved forward along the screw threads 14, it also pushes against the forward tapered bore 12, and thereby forces the forward tapered cylindrical body of the sleeve 10 to expand outward. At this point, the engaging teeth 17, 18, 19 are caused by the altered taper of the sleeve 10 to move outward like a stretched umbrella and therefore tightly engage with the wall of the hole 51 and hold the sleeve 10 in place in the hole 51.
The expansion mounting sleeve 10 of the present invention is formed by stainping using progressive dies. FIGS. 10A to 10H show in concrete the steps of forming the expansion mounting sleeve 10. First, prepare a material having dimensions required to produce the expansion mounting sleeve 10, and then form two or more tapered areas 22 on the material extending parallel to one another along an axis of the material in a common direction from a portion of the material interconnecting the tapered areas 22, as shown in FIG. IOA. Then, press the material in pre-defined thread forming areas 24 to form one or more slots 26 parallel to the axis of the material, as shown in FIG. I OB. Then, press the material again to form a barb 30 and/or more than one engaging tooth 16, 17, 18 in the tapered areas 22. It is noted the engaging teeth 16, 17, 18 have different heights which increase toward a front end of the tapered areas. The engaging teeth 16, 17, 18 are then bent toward an outer side of the material, as shown in FIG. 10C. Thereafter, press the material at the thread forming areas 24 to form screw threads 14 having a required size, as shown in Fig. IOD. The material is then pressed at the tapered areas 22 to form at least 1 degree of bending, as shown in Fig. 10E.
After the above steps are completed, the material is further stamped, so that the thread forming a--eas 24 are pressed into a U-sectioned shape, as showri in Fig. 10F. Then, the thread forming areas 14 are further curled, so that the whole material 1o has a cross section appi-oximate to a circle, as shown in Fig.
IOG. When the thread forming areas 24 ai-e fully curled to form a cylindrical body having a circular cross section, a locking structure 60, which consists of an ear section 61 and a recess section 62 correspondingly formed at two opposite edges of the material near a rear end thei-eof, is locl:ed to hold the curled material in the formed cylindrical body, as shown in Fig.
IOH. Finally, trim off the temporary connecting belt of material to obtain a finished product of'the expansion mounting sleeve 10.
F1-om the above desci-ibed steps, it can be found that the expansion mounting sleeve 10 of the present invention is integrally foi-med by employing the existing well matured stamping and press forming techniques and designing high-precision pr-ogressive dies, and using the widely available matei-ials. The expansion mounting sleeve 10 has the following advantages:
(1) The loclcing structure 60 effectively prevents the rear end of the cylindrical body of the sleeve 10 from being expanded and becoming loosened when the bolt 40 is sci-ewed into the screw thi-eads 14 froin the rear end of the sleeve 10.
(2) The one or inore stopping tooth areas 20 effectively prevent the sleeve 10 mounted in the hole 51 from rotating when the bolt 40 is initially screwed thei-einto.
(3) Since the bore 12 of the sleeve 10 is internally threaded, and the bore 12 and the cylindi-ical body of the sleeve 10 ai-e forward tapered, the bolt 40 of right size screwed into the sleeve 10 along the tlzi-eads 14 would finally expancl a front portion of the sleeve 10 into a fully straight cylindrical shape, and cause the engaging teeth 16, 1 7, 18 to move outward like a stretched umbrella to tightly engage with the wall 50 in the hole 51, and thereby firinly liold the sleeve 10 in place in the hole 51.
(4) The sleeve 10 is integrally formed by stamping through easy and duick processing procedures_ A variety of usable matel-ials may he selected for manufacturing the sleeve 10 without unnecessarily wasting the material.
The associating bolt 40 inay be an easily accessed ready-made bolt to facilitate 100% successful fastening operation using the bolt 40 and the expansion rnounting sleeve 10 within shortened tiine period at reduced pr-oduct and labor costs.
The associating bolt 40 inay be an easily accessed ready-made bolt to facilitate 100% successful fastening operation using the bolt 40 and the expansion rnounting sleeve 10 within shortened tiine period at reduced pr-oduct and labor costs.
(5) The expansion mounting sleeve 10 inay be integrally formed by stamping a cold-rolled metal strip using liigh-precision progressive dies at high productivity.
(6) The material for the expansion mounting sleeve 10 may be selected according to diffet-ent applications. Ainong others, the widely available metal matel-ial can be conveniently used.
(7) The expansion mounting sleeve 10 is integrally formed by stamping a cold-i-olled inetal sti-ip to simplify the manufacturing procedures and largely save the material, compared to various kinds of n-ietal expansion bolt 2 o asseinblies or mounting nuts manufactured using conventional p--ocessing techniques, such as turning, cold forging, etc. For example, in the tiu-ning cut expansion bolt assembly, a round bar must be turning cut and then subjected to a secondary processing of grooving to form 2 5 an expansion sleeve, and a taper-headed bolt is colcl forged to use with the sleeve; and in the cold forged expansion bolt assembly, a rouild bar must be cold forged to foi-in a taper-headed bolt, which is then used with other parts; and in the turning cut mounting nut, a round bar must be turning cut.
(8) The expansion mounting sleeve 10 is made to use with t-eady-inacle bolts anci screws. All bolts or screws having lenQ,th, size, and sci-ew threads matching the internal ly thi-eaded bor-e 12 of the sleeve 10 inay be selected for use. The sleeve 10 of the present invention is therefoi-e superior to the conventional expansioti bolt asseinblies in tei-ms of the compatibility of the sleeve with the bolt.
(9) It is ver-y easy to use the expansion mounting sleeve 10 of the pi-esent invention to fasten a bolt oi- scl-ew to a wall.
To do so, simply drive the sleeve 10 into the hole 51 predrilled on the wall 50, and select a matching bolt oi-screw 40 to screw into the sleeve 10. A person of 2 o general skill inay handle the sleeve 10 and the bolt 40 to complete the fastening operation within a shoi-t time.
( 1 0) The expansion mounting sleeve 10 is firmly mounted in the hole 51 on the wall 50 wllen the bolt 40 is screwed into the threaded bor-e 12 of the sleeve 10 to expancl the tapei-ed front poi-tion of the sleeve 10, which in turn ls causes the engaging teeth 16, 17, 18 to move outwar-d and tightly engage with the wall 50 to hold the sleeve 10 in place in the hole 51. The sleeve 10 mounted in the hole 1 in this manner is absolutely pi-evented from idling or 5 loosening in the hole 51.
(11) Since the sleeve 10 is in the form of a female member, the matclling bolt 40 in the for-m of a male membei- does not project from the rear end of the sleeve 10 when the fastening operation is completed, giving the wall a visually pleasant sLu-face and ensuring the tiglit attachmetlt of the expansion moLUZting sleeve 10 and the bolt 40 to the wall 50.
In brief, the expansion mounting sleeve 10 of the present invention can be manufactured by integral stamping through simple and quick processing proeedLn-es. And, a variety of usable matei-ials inay be selected for manufacturing the sleeve 10. The bolt 40 for Lising with the sleeve 10 may be easily accessed from the ready-macle products. And, the sleeve 10 may be efficiently driven into oi- mounted in a wall without the risl: of becoming loosened frorn the wall.
~F~
To do so, simply drive the sleeve 10 into the hole 51 predrilled on the wall 50, and select a matching bolt oi-screw 40 to screw into the sleeve 10. A person of 2 o general skill inay handle the sleeve 10 and the bolt 40 to complete the fastening operation within a shoi-t time.
( 1 0) The expansion mounting sleeve 10 is firmly mounted in the hole 51 on the wall 50 wllen the bolt 40 is screwed into the threaded bor-e 12 of the sleeve 10 to expancl the tapei-ed front poi-tion of the sleeve 10, which in turn ls causes the engaging teeth 16, 17, 18 to move outwar-d and tightly engage with the wall 50 to hold the sleeve 10 in place in the hole 51. The sleeve 10 mounted in the hole 1 in this manner is absolutely pi-evented from idling or 5 loosening in the hole 51.
(11) Since the sleeve 10 is in the form of a female member, the matclling bolt 40 in the for-m of a male membei- does not project from the rear end of the sleeve 10 when the fastening operation is completed, giving the wall a visually pleasant sLu-face and ensuring the tiglit attachmetlt of the expansion moLUZting sleeve 10 and the bolt 40 to the wall 50.
In brief, the expansion mounting sleeve 10 of the present invention can be manufactured by integral stamping through simple and quick processing proeedLn-es. And, a variety of usable matei-ials inay be selected for manufacturing the sleeve 10. The bolt 40 for Lising with the sleeve 10 may be easily accessed from the ready-macle products. And, the sleeve 10 may be efficiently driven into oi- mounted in a wall without the risl: of becoming loosened frorn the wall.
~F~
Claims (2)
1. A method of forming an expansion mounting sleeve by stamping using progressive dies, comprising the steps of:
preparing a material having dimensions needed to form said expansion mounting sleeve, forming at least two tapered areas on the material such that the at least two tapered areas extend longitudinally in a common direction along a single axis of the material, and defining thread forming areas on the material;
pressing the material to form more than one slot in said thread forming areas;
pressing the material to form at least one barb and engaging tooth in each of said tapered areas;
pressing the material to form screw threads of a desired size in said thread forming areas;
pressing the material to bend said tapered areas;
pressing said thread forming areas to form a U-sectioned shape;
further curling said thread forming areas into a cylindrical body having a circular cross section; and trimming off unnecessary temporary connecting material belt to complete one unit of said expansion mounting sleeve.
preparing a material having dimensions needed to form said expansion mounting sleeve, forming at least two tapered areas on the material such that the at least two tapered areas extend longitudinally in a common direction along a single axis of the material, and defining thread forming areas on the material;
pressing the material to form more than one slot in said thread forming areas;
pressing the material to form at least one barb and engaging tooth in each of said tapered areas;
pressing the material to form screw threads of a desired size in said thread forming areas;
pressing the material to bend said tapered areas;
pressing said thread forming areas to form a U-sectioned shape;
further curling said thread forming areas into a cylindrical body having a circular cross section; and trimming off unnecessary temporary connecting material belt to complete one unit of said expansion mounting sleeve.
2. The method of forming an expansion mounting sleeve as claimed in claim 1, wherein said slots formed in said thread forming areas each extend parallel to the axis of the material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2555118A CA2555118C (en) | 2006-08-01 | 2006-08-01 | Method of forming an expansion mounting sleeve and the product thereof |
| CA002665753A CA2665753A1 (en) | 2006-08-01 | 2006-08-01 | Method of forming an expansion mounting sleeve and the product thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2555118A CA2555118C (en) | 2006-08-01 | 2006-08-01 | Method of forming an expansion mounting sleeve and the product thereof |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002665753A Division CA2665753A1 (en) | 2006-08-01 | 2006-08-01 | Method of forming an expansion mounting sleeve and the product thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2555118A1 CA2555118A1 (en) | 2008-02-01 |
| CA2555118C true CA2555118C (en) | 2010-03-23 |
Family
ID=38988159
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002665753A Abandoned CA2665753A1 (en) | 2006-08-01 | 2006-08-01 | Method of forming an expansion mounting sleeve and the product thereof |
| CA2555118A Expired - Fee Related CA2555118C (en) | 2006-08-01 | 2006-08-01 | Method of forming an expansion mounting sleeve and the product thereof |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002665753A Abandoned CA2665753A1 (en) | 2006-08-01 | 2006-08-01 | Method of forming an expansion mounting sleeve and the product thereof |
Country Status (1)
| Country | Link |
|---|---|
| CA (2) | CA2665753A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022006618A1 (en) * | 2020-07-06 | 2022-01-13 | Mckenzie Hugh Malcolm Roy | A rear sight adapter and method of use thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837337A (en) * | 2022-06-21 | 2022-08-02 | 中建科技(济南)有限公司 | Prestress laminated bottom plate with turnover ribs and production and construction process |
-
2006
- 2006-08-01 CA CA002665753A patent/CA2665753A1/en not_active Abandoned
- 2006-08-01 CA CA2555118A patent/CA2555118C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022006618A1 (en) * | 2020-07-06 | 2022-01-13 | Mckenzie Hugh Malcolm Roy | A rear sight adapter and method of use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2555118A1 (en) | 2008-02-01 |
| CA2665753A1 (en) | 2008-02-01 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20220802 |