CA2665753A1 - 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
- CA2665753A1 CA2665753A1 CA002665753A CA2665753A CA2665753A1 CA 2665753 A1 CA2665753 A1 CA 2665753A1 CA 002665753 A CA002665753 A CA 002665753A CA 2665753 A CA2665753 A CA 2665753A CA 2665753 A1 CA2665753 A1 CA 2665753A1
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- cylindrical body
- expansion
- mounting sleeve
- expansion mounting
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 12
- 230000000750 progressive effect Effects 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000000712 assembly Effects 0.000 description 6
- 238000000429 assembly Methods 0.000 description 6
- 238000010273 cold forging Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 241000282887 Suidae Species 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 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
- 230000001419 dependent effect Effects 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
- 229910052725 zinc Inorganic materials 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 crewed 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
he present invention relates to an expansion mounting sleeve, and p1ore particularly to an expansion mounting sleeve that can be driven or ,inounted 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 THE INVENTION
II!
The currently commercially available expansion bolt assemblies and associated mounting nuts are manufactured in different manners, such as injection molding plastic materials, casting zinc, lead, or aluminum lloys, turning cutting rods to form bolts and cold forging pipes to form lexpansion sleeves, and cold forging rods to form bolts and stamping 0eet metal to form expansion sleeves.
AIl these conventional expansion bolt assemblies and mounting nuts jrequire complicate processing apparatus and a lot of parts, as well as ~elatively high quantity of material to produce them. And, the oonventional expansion bolt assemblies or mounting nuts tend to fail in astening because the expansion sleeves thereof fail to expand as esired, causing the bolts or the mounting nuts to idle without being ightened against the expansion sleeves.
ig. 1 shows a first conventional expansion mounting screw assembly ormed from a plastic material. The plastic expansion screw assembly as the advantages of low material cost and resistant to rust, but equires high cost for molds and has low production speed. The plastic expansion screw assembly also has low rigidity as well as small ngaging friction with wall, and accordingly, weak tensile strength and earing strength. Therefore, the expansion sleeve of the plastic expansion mounting screw assembly tends to be easily pulled out of the wall.
The conventional expansion mounting nuts cast by alloys require longer ~ime to produce and involve a lot of tools and processing procedures, including tapping, assembling, etc. The major disadvantages of the cast alloy expansion mounting nuts include a limited range of usable materials and a mechanical strength lower than the products made of a cold-rolled metal strip material.
Pig. 2 shows a conventional turning cut expansion sleeve or mounting ut for an expansion bolt assembly, which requires longer time to Oroduce a primary body and form grooves on the primary body in secondary processing. A lot of material is waste in turning cut. The urning cut expansion sleeve must be used with a taper-headed bolt to chieve the expansion of the sleeve. Another disadvantage is the tuning cut expansion sleeve is often made of high speed steel, which has a resistance too high to allow successful expansion of the sleeve, I'~,I~
III
resulting in idling of the bolt or the nut against the expansion sleeve ithout effectively achieving the fastening operation. This type of xpansion bolt assembly is therefore not suitable for use in assembling ork pieces, erecting construction works, or assembling DIY
do-it-yourself) products.
=conventional expansion bolt assembly including a cold-forged metal bolt and a turning cut metal sleeve is currently most widely used in civil works, restoration, hanging, equipment installation and positioning, ~tc. The bolt is taper-headed, and the sleeve is processed to form slits hereon. This type of expansion bolt assembly also includes a flat wash, an expansion washer, and a nut, and may be handled in two ways.
n the first way, first moves the nut to a rear end of the bolt, then, drive he expansion bolt assembly into a hole pre-drilled on a wall surface, 4nd then tighten the nut, so that the taper-headed bolt expands the forced forward slit sleeve. The sleeve of this type of expansion bolt 4ssembly frequently fails to expand due to a high resistance, resulting n idling when the nut is tightened against the bolt. In the second way, iirst move 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 release he nut and the expansion washer from the bolt. Thereafter, use a leeve larger than the bolt to force the slit metal sleeve forward, so that apered head of the bolt forces the slit metal sleeve to expand and achieve the purpose of tightly fastening the expansion bolt assembly to e wall. However, since the pre-drilled hole is often incorrect in epth, or biased, or too soft at the bottom thereof, the metal sleeve ends to move too much forward or the bolt tends to idle. In addition, his type of expansion bolt assembly includes a lot of associated parts nd requires good skill to handle it to avoid failure in mounting it.
ig. 3 shows a further conventional expansion bolt assembly that is an iMproved version of the above-described type of expansion bolt ssembly, and mainly includes a cold-forged bolt and an expansion leeve formed by stamping. Forming the expansion sleeve by stamping may advantageously reduce the manufacturing cost and lower the Osistance to expansion so as to increase the engaging friction of the sleeve with the wall. The stamped expansion sleeve is expanded by ~rcing or screwing the taper-headed bolt into the sleeve. This i proved type of expansion bolt assembly still has the drawbacks of i cluding too many parts and requiring longer time to assemble the pJarts together.
_li If is therefore tried by the inventor to overcome the drawbacks existed io the conventional expansion bolt assemblies by developing an i#dependent expansion mounting sleeve formed by stamping using p ogressive dies through simple and less processing procedures, so that t e expansion mounting sleeve has the advantages of requiring less n1aterial to form it, having an internally threaded bore to ensure tight s~rewing of a matching ready-made bolt into it to expand the sleeve ithout the risk of idling, having a plurality of differently sized and s aped and outward protruded engaging teeth to ensure firm and f'ctional contact of the expanded sleeve with the wall without the risk III
f becoming loosened or being pulled out, and largely reducing the ools and costs for manufacturing it.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide an expansion niounting sleeve that can be quickly manufactured using a variety of i~aaterials with reduced material quantity through simple processing Procedures.
Another object of the present invention is to provide an expansion piounting sleeve that can be conveniently used with a ready-made bolt llaving matching length, size, and screw threads; so that the apparatus 4nd tools needed to produce the expansion mounting sleeve can be l~rgely simplified.
~ further object of the present invention is to provide an expansion "nting sleeve that can be easily handled by a person with general slkill to successfully complete the fastening work within a shortened t~me period.
A still further object of the present invention is to provide an expansion nhounting sleeve that could be efficiently driven into or mounted in a wall without the risk of becoming loosened.
~o achieve the above and other objects, the expansion mounting sleeve pf the present invention includes a forward tapered cylindrical body ormed by stamping and pressing a cold-rolled metal strip to define an nternally threaded tapered bore. A plurality of engaging teeth having ifferent 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 hreads matching the threaded bore of the cylindrical body may be $crewed into the bore and thereby expands the forward tapered Oylindrical body of the sleeve, causing the engaging teeth to extend butward and tightly engage with the wall in the hole, so as to firmly 4old the expansion mounting sleeve in place in the hole.
The expansion mounting sleeve of the present invention is formed by stamping and pressing using progressive dies. A method of alanufacturing 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 t4pered areas on the material, and defining thread forming areas on the rpaterial;
('b) pressing the material to form more than one slot in the thread fbrming areas, such that the slots are parallel to an axis of the material;
(I~) pressing the material to form at least one barb and/or more than one utward protruded engaging teeth in each of the tapered areas, the ngaging teeth have heights that increase toward a front end of the rriaterial;
~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 (i t,apered areas;
(~f) pressing the thread forming areas to form a U-sectioned shape;
('Ig) further curling the thread forming areas into a circular cross section;
4nd (h) trimming off unnecessary temporary connecting material belt to domplete one unit of the expansion mounting sleeve.
BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention tb achieve the above and other objects can be best understood by roferring to the following detailed description of the preferred cmbodiments and the accompanying drawings, wherein ~
Iiig. 1 is a perspective view of a conventional expansion mounting !I __ II!
crew assembly;
ig. 2 is a perspective view of a sleeve of another conventional xpansion bolt assembly;
ig. 3 is a perspective view of a further conventional expansion bolt gssembly;
Fig. 4 is a perspective view of an expansion mounting sleeve according tb a preferred embodiment of the present invention;
Fig. 5 is a perspective view of the expansion mounting sleeve of Fig. 4 v`rith a bolt screwed thereinto;
Pigs. 6 to 9 show the manner of screwing a bolt into a wall surface via the expansion mounting sleeve of the present invention;
Pigs. 10A to 10H show the steps included in a method of forming the dxpansion 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 embodiment of the present invention. A bolt 40 having suitable length, size, and screw threads for s~rewing into the expansion mounting sleeve 10 is also shown in Fig. 1.
AND THE PRODUCT THEREOF
FIELD OF THE INVENTION
he present invention relates to an expansion mounting sleeve, and p1ore particularly to an expansion mounting sleeve that can be driven or ,inounted 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 THE INVENTION
II!
The currently commercially available expansion bolt assemblies and associated mounting nuts are manufactured in different manners, such as injection molding plastic materials, casting zinc, lead, or aluminum lloys, turning cutting rods to form bolts and cold forging pipes to form lexpansion sleeves, and cold forging rods to form bolts and stamping 0eet metal to form expansion sleeves.
AIl these conventional expansion bolt assemblies and mounting nuts jrequire complicate processing apparatus and a lot of parts, as well as ~elatively high quantity of material to produce them. And, the oonventional expansion bolt assemblies or mounting nuts tend to fail in astening because the expansion sleeves thereof fail to expand as esired, causing the bolts or the mounting nuts to idle without being ightened against the expansion sleeves.
ig. 1 shows a first conventional expansion mounting screw assembly ormed from a plastic material. The plastic expansion screw assembly as the advantages of low material cost and resistant to rust, but equires high cost for molds and has low production speed. The plastic expansion screw assembly also has low rigidity as well as small ngaging friction with wall, and accordingly, weak tensile strength and earing strength. Therefore, the expansion sleeve of the plastic expansion mounting screw assembly tends to be easily pulled out of the wall.
The conventional expansion mounting nuts cast by alloys require longer ~ime to produce and involve a lot of tools and processing procedures, including tapping, assembling, etc. The major disadvantages of the cast alloy expansion mounting nuts include a limited range of usable materials and a mechanical strength lower than the products made of a cold-rolled metal strip material.
Pig. 2 shows a conventional turning cut expansion sleeve or mounting ut for an expansion bolt assembly, which requires longer time to Oroduce a primary body and form grooves on the primary body in secondary processing. A lot of material is waste in turning cut. The urning cut expansion sleeve must be used with a taper-headed bolt to chieve the expansion of the sleeve. Another disadvantage is the tuning cut expansion sleeve is often made of high speed steel, which has a resistance too high to allow successful expansion of the sleeve, I'~,I~
III
resulting in idling of the bolt or the nut against the expansion sleeve ithout effectively achieving the fastening operation. This type of xpansion bolt assembly is therefore not suitable for use in assembling ork pieces, erecting construction works, or assembling DIY
do-it-yourself) products.
=conventional expansion bolt assembly including a cold-forged metal bolt and a turning cut metal sleeve is currently most widely used in civil works, restoration, hanging, equipment installation and positioning, ~tc. The bolt is taper-headed, and the sleeve is processed to form slits hereon. This type of expansion bolt assembly also includes a flat wash, an expansion washer, and a nut, and may be handled in two ways.
n the first way, first moves the nut to a rear end of the bolt, then, drive he expansion bolt assembly into a hole pre-drilled on a wall surface, 4nd then tighten the nut, so that the taper-headed bolt expands the forced forward slit sleeve. The sleeve of this type of expansion bolt 4ssembly frequently fails to expand due to a high resistance, resulting n idling when the nut is tightened against the bolt. In the second way, iirst move 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 release he nut and the expansion washer from the bolt. Thereafter, use a leeve larger than the bolt to force the slit metal sleeve forward, so that apered head of the bolt forces the slit metal sleeve to expand and achieve the purpose of tightly fastening the expansion bolt assembly to e wall. However, since the pre-drilled hole is often incorrect in epth, or biased, or too soft at the bottom thereof, the metal sleeve ends to move too much forward or the bolt tends to idle. In addition, his type of expansion bolt assembly includes a lot of associated parts nd requires good skill to handle it to avoid failure in mounting it.
ig. 3 shows a further conventional expansion bolt assembly that is an iMproved version of the above-described type of expansion bolt ssembly, and mainly includes a cold-forged bolt and an expansion leeve formed by stamping. Forming the expansion sleeve by stamping may advantageously reduce the manufacturing cost and lower the Osistance to expansion so as to increase the engaging friction of the sleeve with the wall. The stamped expansion sleeve is expanded by ~rcing or screwing the taper-headed bolt into the sleeve. This i proved type of expansion bolt assembly still has the drawbacks of i cluding too many parts and requiring longer time to assemble the pJarts together.
_li If is therefore tried by the inventor to overcome the drawbacks existed io the conventional expansion bolt assemblies by developing an i#dependent expansion mounting sleeve formed by stamping using p ogressive dies through simple and less processing procedures, so that t e expansion mounting sleeve has the advantages of requiring less n1aterial to form it, having an internally threaded bore to ensure tight s~rewing of a matching ready-made bolt into it to expand the sleeve ithout the risk of idling, having a plurality of differently sized and s aped and outward protruded engaging teeth to ensure firm and f'ctional contact of the expanded sleeve with the wall without the risk III
f becoming loosened or being pulled out, and largely reducing the ools and costs for manufacturing it.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide an expansion niounting sleeve that can be quickly manufactured using a variety of i~aaterials with reduced material quantity through simple processing Procedures.
Another object of the present invention is to provide an expansion piounting sleeve that can be conveniently used with a ready-made bolt llaving matching length, size, and screw threads; so that the apparatus 4nd tools needed to produce the expansion mounting sleeve can be l~rgely simplified.
~ further object of the present invention is to provide an expansion "nting sleeve that can be easily handled by a person with general slkill to successfully complete the fastening work within a shortened t~me period.
A still further object of the present invention is to provide an expansion nhounting sleeve that could be efficiently driven into or mounted in a wall without the risk of becoming loosened.
~o achieve the above and other objects, the expansion mounting sleeve pf the present invention includes a forward tapered cylindrical body ormed by stamping and pressing a cold-rolled metal strip to define an nternally threaded tapered bore. A plurality of engaging teeth having ifferent 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 hreads matching the threaded bore of the cylindrical body may be $crewed into the bore and thereby expands the forward tapered Oylindrical body of the sleeve, causing the engaging teeth to extend butward and tightly engage with the wall in the hole, so as to firmly 4old the expansion mounting sleeve in place in the hole.
The expansion mounting sleeve of the present invention is formed by stamping and pressing using progressive dies. A method of alanufacturing 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 t4pered areas on the material, and defining thread forming areas on the rpaterial;
('b) pressing the material to form more than one slot in the thread fbrming areas, such that the slots are parallel to an axis of the material;
(I~) pressing the material to form at least one barb and/or more than one utward protruded engaging teeth in each of the tapered areas, the ngaging teeth have heights that increase toward a front end of the rriaterial;
~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 (i t,apered areas;
(~f) pressing the thread forming areas to form a U-sectioned shape;
('Ig) further curling the thread forming areas into a circular cross section;
4nd (h) trimming off unnecessary temporary connecting material belt to domplete one unit of the expansion mounting sleeve.
BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention tb achieve the above and other objects can be best understood by roferring to the following detailed description of the preferred cmbodiments and the accompanying drawings, wherein ~
Iiig. 1 is a perspective view of a conventional expansion mounting !I __ II!
crew assembly;
ig. 2 is a perspective view of a sleeve of another conventional xpansion bolt assembly;
ig. 3 is a perspective view of a further conventional expansion bolt gssembly;
Fig. 4 is a perspective view of an expansion mounting sleeve according tb a preferred embodiment of the present invention;
Fig. 5 is a perspective view of the expansion mounting sleeve of Fig. 4 v`rith a bolt screwed thereinto;
Pigs. 6 to 9 show the manner of screwing a bolt into a wall surface via the expansion mounting sleeve of the present invention;
Pigs. 10A to 10H show the steps included in a method of forming the dxpansion 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 embodiment of the present invention. A bolt 40 having suitable length, size, and screw threads for s~rewing into the expansion mounting sleeve 10 is also shown in Fig. 1.
I'I
ig. 5 is a perspective view showing the expansion mounting sleeve 10 ith the bolt 40 screwed thereinto. As shown, the expansion mounting leeve 10 includes a substantially straight cylindrical body formed by urling a metal material. A locking means 60 is formed at a joint of wo edges of the curled metal material near a rear end of the cylindrical ody of the expansion mounting sleeve 10 by way of stamping. The 1 cking means 60 includes an ear section 61 protruded from one of the tllwo joining edges, and a recess section 62 formed on the other joining 4dge opposite to the ear section 61 for engaging with the latter and tl~ereby lock the two joining edges together (also refer to Fig. l0A).
~he cylindrical body of the sleeve 10 defines a bore 12, which is i~ternally provided with a plurality of screw threads 14. The ylindrical body and the bore 12 of the sleeve 10 are tapered toward a f~ront end the sleeve 10, and at least one engaging tooth 16 is projected ~rom an outer surface of the sleeve 10. In the illustrated embodiment, plurality of engaging teeth 16, 17, 18 having different lengths and shapes are projected from the outer surface of the sleeve 10. Moreover, one or more stopping tooth areas 20 are formed on the cylindrical body ~f the sleeve 10 (see Fig. 6).
Oigs. 6 to 9 are sectional views and partially sectioned views showing tl~e manner of fastening a bolt to a hole 51 on a wall 50 via the e pansion mounting sleeve 10, and the state in which the expansion ounting sleeve 10 is firmly pressed against an inner surface of the h le 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 t reads 14 is screwed into the bore 12 of the sleeve 10. When the bolt 0 is moved forward along the screw threads 14, it also pushes against t e forward tapered bore 12, and thereby forces the forward tapered ylindrical 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 to move outward like a stretched umbrella and therefore tightly e~ngage with the wall of the hole 51 and hold the sleeve 10 in place in t~e hole 51.
Thhe expansion mounting sleeve 10 of the present invention is formed by s~amping using progressive dies. Figs. l0A to lOH show in concrete tlie 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 niaterial, as shown in Fig. IOA. Then, press the material in pre-defined t~read forming areas 24 to form one or more slots 26 parallel to an axis of the material, as shown in Fig. IOB. Then, press the material again tO form a barb 30 and/or more than one engaging tooth 16, 17, 18 in the t pered areas 22. It is noted the engaging teeth 16, 17, 18 have d fferent heights which increase toward a front end of the tapered areas.
T e engaging teeth 16, 17, 18 are then bent toward an outer side of the aterial, as shown in Fig. IOC. Thereafter, press the material at the t read forming areas 24 to form screw threads 14 having a required size, a shown in Fig. I OD. The material is then pressed at the tapered areas 2 to form at least 1 degree of bending, as shown in Fig. 10E.
__...
fter the above steps are completed, the material is further stamped, so at the thread forming areas 24 are pressed into a U-sectioned shape, s shown in Fig. IOF. Then, the thread forming areas 14 are further urled, so that the whole material has a cross section approximate to a ircle, as shown in Fig. IOG. When the thread forming areas 24 are Ily curled to form a cylindrical body having a circular cross section, a lpcking structure 60, which consists of an ear section 61 and a recess s'Iection 62 correspondingly formed at two opposite edges of the material ~ear a rear end thereof, is locked to hold the curled material in the ~rmed cylindrical body, as shown in Fig. IOH. Finally, trim off the t~mporary connecting belt of material to obtain a finished product of t~e expansion mounting sleeve 10.
*om the above described steps, it can be found that the expansion n~ounting sleeve 10 of the present invention is integrally formed by e~nploying the existing well matured stamping and press forming t~chniques and designing high-precision progressive dies, and using the v~idely available materials. The expansion mounting sleeve 10 has the fgllowing advantages:
(~) The locking 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 screwed into the screw threads 14 from the rear end of the sleeve 10.
i ) The one or more stopping tooth areas 20 effectively prevent the sleeve 10 mounted in the hole 51 from rotating when the bolt 40 is initially screwed thereinto.
(I3) Since the bore 12 of the sleeve 10 is internally threaded, and the bore 12 and the cylindrical body of the sleeve 10 are forward tapered, the bolt 40 of right size screwed into the sleeve 10 along the threads 14 would finally expand a front portion of the sleeve into a fully straight cylindrical shape, and cause the engaging 10 teeth 16, 17, 18 to move outward like a stretched umbrella to tightly engage with the wall 50 in the hole 51, and thereby firmly hold the sleeve 10 in place in the hole 51.
(4) The sleeve 10 is integrally formed by stamping through easy and quick processing procedures. A variety of usable materials may be selected for manufacturing the sleeve 10 without unnecessarily wasting the material. The associating bolt 40 may be an easily accessed ready-made bolt to facilitate 100%
successful fastening operation using the bolt 40 and the expansion mounting sleeve 10 within shortened time period at reduced product and labor costs.
(¾) The expansion mounting sleeve 10 may be integrally formed by stamping a cold-roIled metal strip using high-precision progressive dies at high productivity.
~II
I~I
(6) The material for the expansion mounting sleeve 10 may be selected according to different applications. Among others, the widely available metal material can be conveniently used.
7) The expansion mounting sleeve 10 is integrally formed by stamping a cold-rolled metal strip to simplify the manufacturing procedures and largely save the material, compared to various kinds of metal expansion bolt assemblies or mounting nuts manufactured using conventional processing techniques, such as turning, cold forging, etc. For example, in the turning cut expansion bolt assembly, a round bar must be turning cut and then subjected to a secondary processing of grooving to form an expansion sleeve, and a taper-headed bolt is cold forged to use with the sleeve; and in the cold forged expansion bolt assembly, a round bar must be cold forged to form 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 ready-made bolts and screws. All bolts or screws having length, size, and screw threads matching the internally threaded bore 12 of the sleeve 10 may be selected for use. The sleeve 10 of the present invention is therefore superior to the conventional expansion bolt assemblies in terms of the compatibility of the sleeve with the bolt.
III
(9) It is very easy to use the expansion mounting sleeve 10 of the present invention to fasten a bolt or screw 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 or screw 40 to screw into the sleeve 10. A person of general skill may handle the sleeve 10 and the bolt 40 to complete the fastening operation within a short time.
(10) The expansion mounting sleeve 10 is firmly mounted in the hole 51 on the wall 50 when the bolt 40 is screwed into the threaded bore 12 of the sleeve 10 to expand the tapered front portion of the sleeve 10, which in turn causes the engaging teeth 16, 17, 18 to move outward 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 51 in this manner is absolutely prevented from idling or loosening in the hole 51.
ig. 5 is a perspective view showing the expansion mounting sleeve 10 ith the bolt 40 screwed thereinto. As shown, the expansion mounting leeve 10 includes a substantially straight cylindrical body formed by urling a metal material. A locking means 60 is formed at a joint of wo edges of the curled metal material near a rear end of the cylindrical ody of the expansion mounting sleeve 10 by way of stamping. The 1 cking means 60 includes an ear section 61 protruded from one of the tllwo joining edges, and a recess section 62 formed on the other joining 4dge opposite to the ear section 61 for engaging with the latter and tl~ereby lock the two joining edges together (also refer to Fig. l0A).
~he cylindrical body of the sleeve 10 defines a bore 12, which is i~ternally provided with a plurality of screw threads 14. The ylindrical body and the bore 12 of the sleeve 10 are tapered toward a f~ront end the sleeve 10, and at least one engaging tooth 16 is projected ~rom an outer surface of the sleeve 10. In the illustrated embodiment, plurality of engaging teeth 16, 17, 18 having different lengths and shapes are projected from the outer surface of the sleeve 10. Moreover, one or more stopping tooth areas 20 are formed on the cylindrical body ~f the sleeve 10 (see Fig. 6).
Oigs. 6 to 9 are sectional views and partially sectioned views showing tl~e manner of fastening a bolt to a hole 51 on a wall 50 via the e pansion mounting sleeve 10, and the state in which the expansion ounting sleeve 10 is firmly pressed against an inner surface of the h le 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 t reads 14 is screwed into the bore 12 of the sleeve 10. When the bolt 0 is moved forward along the screw threads 14, it also pushes against t e forward tapered bore 12, and thereby forces the forward tapered ylindrical 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 to move outward like a stretched umbrella and therefore tightly e~ngage with the wall of the hole 51 and hold the sleeve 10 in place in t~e hole 51.
Thhe expansion mounting sleeve 10 of the present invention is formed by s~amping using progressive dies. Figs. l0A to lOH show in concrete tlie 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 niaterial, as shown in Fig. IOA. Then, press the material in pre-defined t~read forming areas 24 to form one or more slots 26 parallel to an axis of the material, as shown in Fig. IOB. Then, press the material again tO form a barb 30 and/or more than one engaging tooth 16, 17, 18 in the t pered areas 22. It is noted the engaging teeth 16, 17, 18 have d fferent heights which increase toward a front end of the tapered areas.
T e engaging teeth 16, 17, 18 are then bent toward an outer side of the aterial, as shown in Fig. IOC. Thereafter, press the material at the t read forming areas 24 to form screw threads 14 having a required size, a shown in Fig. I OD. The material is then pressed at the tapered areas 2 to form at least 1 degree of bending, as shown in Fig. 10E.
__...
fter the above steps are completed, the material is further stamped, so at the thread forming areas 24 are pressed into a U-sectioned shape, s shown in Fig. IOF. Then, the thread forming areas 14 are further urled, so that the whole material has a cross section approximate to a ircle, as shown in Fig. IOG. When the thread forming areas 24 are Ily curled to form a cylindrical body having a circular cross section, a lpcking structure 60, which consists of an ear section 61 and a recess s'Iection 62 correspondingly formed at two opposite edges of the material ~ear a rear end thereof, is locked to hold the curled material in the ~rmed cylindrical body, as shown in Fig. IOH. Finally, trim off the t~mporary connecting belt of material to obtain a finished product of t~e expansion mounting sleeve 10.
*om the above described steps, it can be found that the expansion n~ounting sleeve 10 of the present invention is integrally formed by e~nploying the existing well matured stamping and press forming t~chniques and designing high-precision progressive dies, and using the v~idely available materials. The expansion mounting sleeve 10 has the fgllowing advantages:
(~) The locking 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 screwed into the screw threads 14 from the rear end of the sleeve 10.
i ) The one or more stopping tooth areas 20 effectively prevent the sleeve 10 mounted in the hole 51 from rotating when the bolt 40 is initially screwed thereinto.
(I3) Since the bore 12 of the sleeve 10 is internally threaded, and the bore 12 and the cylindrical body of the sleeve 10 are forward tapered, the bolt 40 of right size screwed into the sleeve 10 along the threads 14 would finally expand a front portion of the sleeve into a fully straight cylindrical shape, and cause the engaging 10 teeth 16, 17, 18 to move outward like a stretched umbrella to tightly engage with the wall 50 in the hole 51, and thereby firmly hold the sleeve 10 in place in the hole 51.
(4) The sleeve 10 is integrally formed by stamping through easy and quick processing procedures. A variety of usable materials may be selected for manufacturing the sleeve 10 without unnecessarily wasting the material. The associating bolt 40 may be an easily accessed ready-made bolt to facilitate 100%
successful fastening operation using the bolt 40 and the expansion mounting sleeve 10 within shortened time period at reduced product and labor costs.
(¾) The expansion mounting sleeve 10 may be integrally formed by stamping a cold-roIled metal strip using high-precision progressive dies at high productivity.
~II
I~I
(6) The material for the expansion mounting sleeve 10 may be selected according to different applications. Among others, the widely available metal material can be conveniently used.
7) The expansion mounting sleeve 10 is integrally formed by stamping a cold-rolled metal strip to simplify the manufacturing procedures and largely save the material, compared to various kinds of metal expansion bolt assemblies or mounting nuts manufactured using conventional processing techniques, such as turning, cold forging, etc. For example, in the turning cut expansion bolt assembly, a round bar must be turning cut and then subjected to a secondary processing of grooving to form an expansion sleeve, and a taper-headed bolt is cold forged to use with the sleeve; and in the cold forged expansion bolt assembly, a round bar must be cold forged to form 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 ready-made bolts and screws. All bolts or screws having length, size, and screw threads matching the internally threaded bore 12 of the sleeve 10 may be selected for use. The sleeve 10 of the present invention is therefore superior to the conventional expansion bolt assemblies in terms of the compatibility of the sleeve with the bolt.
III
(9) It is very easy to use the expansion mounting sleeve 10 of the present invention to fasten a bolt or screw 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 or screw 40 to screw into the sleeve 10. A person of general skill may handle the sleeve 10 and the bolt 40 to complete the fastening operation within a short time.
(10) The expansion mounting sleeve 10 is firmly mounted in the hole 51 on the wall 50 when the bolt 40 is screwed into the threaded bore 12 of the sleeve 10 to expand the tapered front portion of the sleeve 10, which in turn causes the engaging teeth 16, 17, 18 to move outward 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 51 in this manner is absolutely prevented from idling or loosening in the hole 51.
(11) Since the sleeve 10 is in the form of a female member, the matching bolt 40 in the form of a male member does not project from the rear end of the sleeve 10 when the fastening operation is completed, giving the wall a visually pleasant surface and ensuring the tight attachment of the expansion mounting sleeve 10 and the bolt 40 to the wall 50.
In brief, the expansion mounting sleeve 10 of the present invention can ~e manufactured by integral stamping through simple and quick .
Orocessing procedures. And, a variety of usable materials may be 4elected for manufacturing the sleeve 10. The bolt 40 for using with ~he sleeve 10 may be easily accessed from the ready-made products.
And, the sleeve 10 may be efficiently driven into or mounted in a wall Itiivithout the risk of becoming loosened from the wall.
II
In brief, the expansion mounting sleeve 10 of the present invention can ~e manufactured by integral stamping through simple and quick .
Orocessing procedures. And, a variety of usable materials may be 4elected for manufacturing the sleeve 10. The bolt 40 for using with ~he sleeve 10 may be easily accessed from the ready-made products.
And, the sleeve 10 may be efficiently driven into or mounted in a wall Itiivithout the risk of becoming loosened from the wall.
II
Claims (7)
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, 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 form at least one degree of bending at 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, 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 form at least one degree of bending at 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 are parallel to an axis of the material.
3. 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 protruded from an outer wall surface at the tapered portion of said cylindrical body.
4. The expansion mounting sleeve as claimed in claim 3, wherein said cylindrical body is formed by curling a metal strip.
5. The expansion mounting sleeve as claimed in claim 3, wherein said cylindrical body of said sleeve has a plurality of said engaging teeth in different heights and shapes.
6. The expansion mounting sleeve as claimed in claim 3, wherein said cylindrical body of said sleeve is further formed at predetermined positions with more than one stopping tooth area.
7. The expansion mounting sleeve as claimed in claim 3, wherein said cylindrical body is formed near the rear end with a locking structure consisting of a forward protruded ear section and an opposite recess section for receiving and engaging with said ear section, so as to hold the rear end of said cylindrical body in a cylindrical form.
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 Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2555118A Division CA2555118C (en) | 2006-08-01 | 2006-08-01 | Method of forming an expansion mounting sleeve and the product thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2665753A1 true CA2665753A1 (en) | 2008-02-01 |
Family
ID=38988159
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2555118A Expired - Fee Related CA2555118C (en) | 2006-08-01 | 2006-08-01 | Method of forming an expansion mounting sleeve and the product thereof |
| CA002665753A Abandoned CA2665753A1 (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 |
|---|---|---|---|
| CA2555118A Expired - Fee Related CA2555118C (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) | CA2555118C (en) |
Families Citing this family (2)
| 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 |
| 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 CA2555118A patent/CA2555118C/en not_active Expired - Fee Related
- 2006-08-01 CA CA002665753A patent/CA2665753A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CA2555118C (en) | 2010-03-23 |
| CA2555118A1 (en) | 2008-02-01 |
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| EEER | Examination request | ||
| FZDE | Dead |