CA1048747A - Swivel hold-down device - Google Patents
Swivel hold-down deviceInfo
- Publication number
- CA1048747A CA1048747A CA76261269A CA261269A CA1048747A CA 1048747 A CA1048747 A CA 1048747A CA 76261269 A CA76261269 A CA 76261269A CA 261269 A CA261269 A CA 261269A CA 1048747 A CA1048747 A CA 1048747A
- Authority
- CA
- Canada
- Prior art keywords
- anchor
- swivel
- side frame
- frame elements
- hold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
- B28B23/024—Supporting means
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
SWIVEL HOLD-DOWN DEVICE
Abstract of the Disclosure A hold-down anchor device for securing reinforcing strands in a mold while the strands are tensioned, the mold filled with concrete, and the concrete allowed to set, is held in place by an anchor means traversing the mold wall.
The hold-down anchor device includes a pair of side frame elements which are disposed parallel to each other and positioned generally vertically in the mold. A number of strand hold-down means extend transversely between the side frame elements. A swivel means is pivotally secured to the lower ends of the side frame elements and includes means for engaging the anchor means. The swivel means further includes means for retaining one or more reinforcing strands near the lower ends of the side frame elements in corresponding closely spaced relation with the mold. The swivel means may include either grooves or rollers for retaining the reinforcing strands near the lower ends of the side frame elements.
Abstract of the Disclosure A hold-down anchor device for securing reinforcing strands in a mold while the strands are tensioned, the mold filled with concrete, and the concrete allowed to set, is held in place by an anchor means traversing the mold wall.
The hold-down anchor device includes a pair of side frame elements which are disposed parallel to each other and positioned generally vertically in the mold. A number of strand hold-down means extend transversely between the side frame elements. A swivel means is pivotally secured to the lower ends of the side frame elements and includes means for engaging the anchor means. The swivel means further includes means for retaining one or more reinforcing strands near the lower ends of the side frame elements in corresponding closely spaced relation with the mold. The swivel means may include either grooves or rollers for retaining the reinforcing strands near the lower ends of the side frame elements.
Description
Docket ~157 1~4879L7 Background of the In-~ention The present invention relates to a hold-down anchor device for securing the reinforcing strands of a prestressed concrete building element in a mold while the strands are tensioned, the mold filled with concrete, and the concrete allowed to set. It is known that the strand characteristics of a concrete building element, such as an I-beam girder, may be improved by embedding strands or cables 1, within the concrete. Also, it is known to tension the strands prior to pouring the concrete, thereby increasing the strength characteristics of the element.
A typical strand configuration in an I beam girder is one in which the strands extend inwardly and downwardly from the upper portion of one end of the girder and pass on an incline through the web portion and into the base portion of the girder where the strands are engaged by a hold-down device. The strands then extend horizontally along the base portion to a second hold-down device from which they extend upwardly and outwardly into the head portion of the opposite end of the girder.
The reinforcing strands of such an element are placed under a great deal of tension, and a hold-down device used with a number of such strands, therefore, is required to handle large static forces. Typically hold-down devices are designed to handle large lift forces, e.g. 5000 pounds per strand, which tend to pull the strands from the girder base portion of an element mold. Lateral forces creating a bending moment about an anchor bolt securing the hold-down ~, Docket 6157 1~3~874~
device to the wall of the mold will quite often damage the bolt or the hold-down device, however. In order to overcome this problem, a swiveling hold-down, such as shown in U.S.
Patent No. 3,854,258, issued December 17, 1974 to Colado et al, has been used. With such a design, the hold-down may swivel at its base to assume an inclined position in which the upward thrust on the cables is along the length of the hold-down.
That is, the angle of incidence of each cable with respect to the hold-down equals the angle of emergence so that the force moment which is created about the anchor bolt of the hold-down device is minimized.
~ variation of this design is shown in U.S. Patent No. 3,831,331, issued August 27, 1974, to Colado. ~n that device, a metal cylinder has a threaded opening for engaging an anchor bolt and also provides a pivot for the hold-down.
A central opening in the cylinder beneath the pivot allows an additional cable to be secured.
One disadvantage of previously known pivoting hold-down deyices has been that the reinforcing strands could not be positioned as clQse to the mold wall as might be desired.
Specifically, it is desired to maintain a predetermined minimum distance in the finished building e,lement between the surface of the element and any metallic member, either a strand or a part of the hold-down unit. This results in an element having superior fire resistant characteristics, as well as substantial immunity from rusting. With previously known hold-down devices, however, maintaining this ~inimum distance has r~sul,ted in the cables being positioned a substantially greater distance from the surface of the building element.
-- 3 -- . , Docket 6157 1~4874~7 Summary of the Invention In accordance with the present invention, a hold-down anchor device, engageable by an anchor means traversing a mold wall, is provided for holding reinforcing strands of a prestressed concrete ~uilding element in position. The hold-down anchor deyice includes a pair of side frame elements which are disposed parallel to each other and positionable generally vertically in the mold. A plurality of strand hold-down means extend transversely between the side frame elements.
A swivel means is pivotally secured to the lower ends of the side frame elements.
This swivel means has a means for engaging the anchor means and further co.nprises means for retaining the r~inforcing strands near the lower ends of the side frane elements such that the strands are at least as low as the projection of the side frame ~lements bel~w the swivel means. The anchor means may comprise a threaded anchor bolt and the means for engaging the anchor means may comprise a threaded transverse opening in the swivel means for receiving the threaded anchor bolt.
The means for retaining the reinforcing strands may comprise grooves in the surface of the swivel means. Alternatively, the swivel means may comprise a central portion defining a threaded opening for engaging the anchor bolt and integral axle portions journalled in the side frame elements. Grooved rollers are journalled on each of the axle portions for retaining the two reinforcing strands.
In another embodiment, the anchor means comprises two threaded anchor bolts, and the means for engaging the anchor means may comprise two threaded transverse openings in the swivel means.
' Docket 6157 1~48~.J47 Accordingly, it is an object of this invention to provide a hold-down anchor device which is pivotable about a swivel engayed by an anchor means extending through a mold wall and which includes means for positioning reinforcing strands near the mold wall while maintaining a predetermined minimum clear distance from the mold wall; and to provide such a device in which the swivel arrangement includes means for retaining the reinforcing strands.
Other ob~ects and advantages of the invention will be apparent from the following description, the accompanying drawings and the appended claims.
Brief Description of the Drawings Fig. 1 is a fragmentary sectional view taken substantially centrally and longitudinally through a concrete building element form, showing a pair of hold-down anchor devices of the preserlt invention;
Fig. 2 is a fragmentary sectional view of a threaded anchor bolt engaging a hold-down anchor device of the present invention;
Fig. 3 is a fragmentary sectional view similar to Fig. 2, but with the anchor bolt removed and grouting inserted;
Fig. 4 is an enlarged side elevational view of one embodiment of the present invention with portions broken away and in section;
Fig. S is a sectional view taken generally along line 5-5 of Fig. 4;
Fig. 6 is an enlarged fragmentary side elevational Yiew of an alternative embodiment of tha present invention with poxtions broken away and in section; and ~ _ 5~_ Docket 6157 1~41~747 Fig. 7 is a side eleYational view of a further embodiment of the present invention.
Detailed Description of the Invention Referring now to Fig. 1, two hold-down anchor devices 12 and 14 of the embodiment of the present invention are shown as installed in a concrete building element.
Typically a building element such as an I-beam girder is formed in a mold 16 into which concrete 18 is poured after reinforcing strands 20, 21 and 22 have been positioned and tensioned. The hold-down devices 12 and 14 are held in position by anchor means, shown here as anchor bolts 25 and 27, respectively, which extend ~lrough the wall of mold 16.
The hold-down anchor devices may pivot about swivel means 35 and 37. This pivoting action is provided in order to prevent the generation of a substantial bending moment about the anchor bolts 25 and 27. When the hold-down anchor devices have pivoted as shown, so that the angle of incidence of each cable 20, 21 and 22 equals the angle of emergence, only an upward force parallel with the hold-down is generated by the reinforcing strands. Bending moments about the hold-down devices or the anchor bolts are thus substantially eliminated.
As shown in Figs. 2 and 3, the anchor bolts are in place only until the concrete is firmly set. At that point, the bolts are removed along with the mold wall 16 and the - resulting holes filled with grouting material 38. As seen in Fig. 3, no metallic part, either the hold-down device 12 or cable 22, is less than a predetermined minimum distance d from a surface 39 of the girder.
Referring now to Fig. 4, there is shown a side elevational view of one embodiment of the invention with .
, Docket 6157 1~8747 portions broken away and in section. A pair of side frame elements 40 and 41 are disposed parallel to each other and positionable generally vertically when in a mold. Strand hold-down means 44 and 46 extend transversely between side frame elements 40 and 41. Strand hold-down means 44 and 46 include bolts 48 and 50 which extend through the side frame elements and are secured by nuts 52 and 53, respectively.
The strand hold-down means further lnclude rollers 55, 56, 57 and 58 which are mounted on the bolts. Cylindrical spacers 61 and 63 hold restrainer plates 65 and 67 in position adjacent the rollers.
As seen in Figs. 4 and 5, swivel lug 70 is positioned between and pivotally secured to the lower ends of side frame elements 40 and 41. Swivel lug 70 includes end portions 71 of reduced diameter which are journalled in the side frame elements 40 and 41 and held by retainer rings 72. Swivel means 70 includes means for engaging the anchor means, here shown as a threaded transverse opening 73 which receives and engages an anchor bolt while the building element is being poured.
Swivel lug 70 further includes means for retaining two reinforcing strands 22 near the lower ends of side frame elements 40 and 41. In Fig. 4, this retaining means includes grooves 75 and 77 in the surface of swivel lug 70 between opening 73 and end side frame element. This configuration will carry the necessary loads and also make it possible to position reinforcing strands 22 as close to the surface of a building element as possible while still maintaining the re~uirement of a concrete insulating coating of a predetermined thickness covering all metallic parts. Thus, after the - .
. ' .
' ~.
- ,.
Docket 6157 348~747 threaded anchor bolt is removed from the finished building element, the strands 22 will be closer to the surface of the element than the hold-down anchor devices.
An alternate embodiment of the invention is shown in Fig. 6, which is a partial side elevational view with poxtions in section. The swivel means 80 is a lug having a central portion 85 containing threaded opening 87 for engaging an anchor bolt. Swivel lug 80 further includes integral axle portions 88 which are journalled in side frame elements 90 and 91 and project therebeyond. Grooved r~ollers 95 are journalled on these projecting axle portions 88 and are held thereon by retainer plates 96 and 97 and retainer rings 99. The embodiment shown in Fig. 6 is satisfactory for use in many installations wherein the tensioning of the strands 22 is not too high. For heavy loading, howaver, it is preferable to use the construction o~ Fig. 4 wherein the swivel lug is of greater diameter in its portions which transmit the loads to the anchor bolt.
A further embodiment of the invention is shown in Fig. 7, which is a side elevational view. Swivel means 115 iS a lug 117 having a~ central portion upon which is journalled xoller 120. ~ug 117 is journalled in side frame elements 125 and projects therebeyond. Lug 117 defines threaded openings 130 which engage anchor bo~ts 135. This embodiment is used where only one row of reinforcing strands is to be held.
While the forms of apparatus herein described - constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to these precise forms of apparatus, and that changes may be ~ade therein without departing from the scope of the invention.
.
'.'' ' . . ' ' !
A typical strand configuration in an I beam girder is one in which the strands extend inwardly and downwardly from the upper portion of one end of the girder and pass on an incline through the web portion and into the base portion of the girder where the strands are engaged by a hold-down device. The strands then extend horizontally along the base portion to a second hold-down device from which they extend upwardly and outwardly into the head portion of the opposite end of the girder.
The reinforcing strands of such an element are placed under a great deal of tension, and a hold-down device used with a number of such strands, therefore, is required to handle large static forces. Typically hold-down devices are designed to handle large lift forces, e.g. 5000 pounds per strand, which tend to pull the strands from the girder base portion of an element mold. Lateral forces creating a bending moment about an anchor bolt securing the hold-down ~, Docket 6157 1~3~874~
device to the wall of the mold will quite often damage the bolt or the hold-down device, however. In order to overcome this problem, a swiveling hold-down, such as shown in U.S.
Patent No. 3,854,258, issued December 17, 1974 to Colado et al, has been used. With such a design, the hold-down may swivel at its base to assume an inclined position in which the upward thrust on the cables is along the length of the hold-down.
That is, the angle of incidence of each cable with respect to the hold-down equals the angle of emergence so that the force moment which is created about the anchor bolt of the hold-down device is minimized.
~ variation of this design is shown in U.S. Patent No. 3,831,331, issued August 27, 1974, to Colado. ~n that device, a metal cylinder has a threaded opening for engaging an anchor bolt and also provides a pivot for the hold-down.
A central opening in the cylinder beneath the pivot allows an additional cable to be secured.
One disadvantage of previously known pivoting hold-down deyices has been that the reinforcing strands could not be positioned as clQse to the mold wall as might be desired.
Specifically, it is desired to maintain a predetermined minimum distance in the finished building e,lement between the surface of the element and any metallic member, either a strand or a part of the hold-down unit. This results in an element having superior fire resistant characteristics, as well as substantial immunity from rusting. With previously known hold-down devices, however, maintaining this ~inimum distance has r~sul,ted in the cables being positioned a substantially greater distance from the surface of the building element.
-- 3 -- . , Docket 6157 1~4874~7 Summary of the Invention In accordance with the present invention, a hold-down anchor device, engageable by an anchor means traversing a mold wall, is provided for holding reinforcing strands of a prestressed concrete ~uilding element in position. The hold-down anchor deyice includes a pair of side frame elements which are disposed parallel to each other and positionable generally vertically in the mold. A plurality of strand hold-down means extend transversely between the side frame elements.
A swivel means is pivotally secured to the lower ends of the side frame elements.
This swivel means has a means for engaging the anchor means and further co.nprises means for retaining the r~inforcing strands near the lower ends of the side frane elements such that the strands are at least as low as the projection of the side frame ~lements bel~w the swivel means. The anchor means may comprise a threaded anchor bolt and the means for engaging the anchor means may comprise a threaded transverse opening in the swivel means for receiving the threaded anchor bolt.
The means for retaining the reinforcing strands may comprise grooves in the surface of the swivel means. Alternatively, the swivel means may comprise a central portion defining a threaded opening for engaging the anchor bolt and integral axle portions journalled in the side frame elements. Grooved rollers are journalled on each of the axle portions for retaining the two reinforcing strands.
In another embodiment, the anchor means comprises two threaded anchor bolts, and the means for engaging the anchor means may comprise two threaded transverse openings in the swivel means.
' Docket 6157 1~48~.J47 Accordingly, it is an object of this invention to provide a hold-down anchor device which is pivotable about a swivel engayed by an anchor means extending through a mold wall and which includes means for positioning reinforcing strands near the mold wall while maintaining a predetermined minimum clear distance from the mold wall; and to provide such a device in which the swivel arrangement includes means for retaining the reinforcing strands.
Other ob~ects and advantages of the invention will be apparent from the following description, the accompanying drawings and the appended claims.
Brief Description of the Drawings Fig. 1 is a fragmentary sectional view taken substantially centrally and longitudinally through a concrete building element form, showing a pair of hold-down anchor devices of the preserlt invention;
Fig. 2 is a fragmentary sectional view of a threaded anchor bolt engaging a hold-down anchor device of the present invention;
Fig. 3 is a fragmentary sectional view similar to Fig. 2, but with the anchor bolt removed and grouting inserted;
Fig. 4 is an enlarged side elevational view of one embodiment of the present invention with portions broken away and in section;
Fig. S is a sectional view taken generally along line 5-5 of Fig. 4;
Fig. 6 is an enlarged fragmentary side elevational Yiew of an alternative embodiment of tha present invention with poxtions broken away and in section; and ~ _ 5~_ Docket 6157 1~41~747 Fig. 7 is a side eleYational view of a further embodiment of the present invention.
Detailed Description of the Invention Referring now to Fig. 1, two hold-down anchor devices 12 and 14 of the embodiment of the present invention are shown as installed in a concrete building element.
Typically a building element such as an I-beam girder is formed in a mold 16 into which concrete 18 is poured after reinforcing strands 20, 21 and 22 have been positioned and tensioned. The hold-down devices 12 and 14 are held in position by anchor means, shown here as anchor bolts 25 and 27, respectively, which extend ~lrough the wall of mold 16.
The hold-down anchor devices may pivot about swivel means 35 and 37. This pivoting action is provided in order to prevent the generation of a substantial bending moment about the anchor bolts 25 and 27. When the hold-down anchor devices have pivoted as shown, so that the angle of incidence of each cable 20, 21 and 22 equals the angle of emergence, only an upward force parallel with the hold-down is generated by the reinforcing strands. Bending moments about the hold-down devices or the anchor bolts are thus substantially eliminated.
As shown in Figs. 2 and 3, the anchor bolts are in place only until the concrete is firmly set. At that point, the bolts are removed along with the mold wall 16 and the - resulting holes filled with grouting material 38. As seen in Fig. 3, no metallic part, either the hold-down device 12 or cable 22, is less than a predetermined minimum distance d from a surface 39 of the girder.
Referring now to Fig. 4, there is shown a side elevational view of one embodiment of the invention with .
, Docket 6157 1~8747 portions broken away and in section. A pair of side frame elements 40 and 41 are disposed parallel to each other and positionable generally vertically when in a mold. Strand hold-down means 44 and 46 extend transversely between side frame elements 40 and 41. Strand hold-down means 44 and 46 include bolts 48 and 50 which extend through the side frame elements and are secured by nuts 52 and 53, respectively.
The strand hold-down means further lnclude rollers 55, 56, 57 and 58 which are mounted on the bolts. Cylindrical spacers 61 and 63 hold restrainer plates 65 and 67 in position adjacent the rollers.
As seen in Figs. 4 and 5, swivel lug 70 is positioned between and pivotally secured to the lower ends of side frame elements 40 and 41. Swivel lug 70 includes end portions 71 of reduced diameter which are journalled in the side frame elements 40 and 41 and held by retainer rings 72. Swivel means 70 includes means for engaging the anchor means, here shown as a threaded transverse opening 73 which receives and engages an anchor bolt while the building element is being poured.
Swivel lug 70 further includes means for retaining two reinforcing strands 22 near the lower ends of side frame elements 40 and 41. In Fig. 4, this retaining means includes grooves 75 and 77 in the surface of swivel lug 70 between opening 73 and end side frame element. This configuration will carry the necessary loads and also make it possible to position reinforcing strands 22 as close to the surface of a building element as possible while still maintaining the re~uirement of a concrete insulating coating of a predetermined thickness covering all metallic parts. Thus, after the - .
. ' .
' ~.
- ,.
Docket 6157 348~747 threaded anchor bolt is removed from the finished building element, the strands 22 will be closer to the surface of the element than the hold-down anchor devices.
An alternate embodiment of the invention is shown in Fig. 6, which is a partial side elevational view with poxtions in section. The swivel means 80 is a lug having a central portion 85 containing threaded opening 87 for engaging an anchor bolt. Swivel lug 80 further includes integral axle portions 88 which are journalled in side frame elements 90 and 91 and project therebeyond. Grooved r~ollers 95 are journalled on these projecting axle portions 88 and are held thereon by retainer plates 96 and 97 and retainer rings 99. The embodiment shown in Fig. 6 is satisfactory for use in many installations wherein the tensioning of the strands 22 is not too high. For heavy loading, howaver, it is preferable to use the construction o~ Fig. 4 wherein the swivel lug is of greater diameter in its portions which transmit the loads to the anchor bolt.
A further embodiment of the invention is shown in Fig. 7, which is a side elevational view. Swivel means 115 iS a lug 117 having a~ central portion upon which is journalled xoller 120. ~ug 117 is journalled in side frame elements 125 and projects therebeyond. Lug 117 defines threaded openings 130 which engage anchor bo~ts 135. This embodiment is used where only one row of reinforcing strands is to be held.
While the forms of apparatus herein described - constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to these precise forms of apparatus, and that changes may be ~ade therein without departing from the scope of the invention.
.
'.'' ' . . ' ' !
Claims
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
A hold-down anchor device, engageable by an anchor means traversing a mold wall, for holding the reinforcing strands of a prestressed concrete building element in position in the mold while the strands are tensioned, the mold filled with concrete, and the concrete allowed to set, comprising:
a pair of side frame elements disposed parallel to each other and positionable generally vertically in the mold, a plurality of strand hold-down means extending transversely between said side frame elements, and swivel means pivotally secured to the lower ends of said side frame elements and having means for engaging the anchor means, said swivel means further comprising means for retaining reinforcing strands near said ends of said side frame elements such that said strands are at least as low as the projection of said side frame elements below said swivel-means.
The anchor device of claim 1 in which the anchor means comprises a threaded anchor bolt, and said means for engaging the anchor means comprises a threaded transverse opening in said swivel means for receiving said threaded anchor bolt.
The anchor device of claim 2 in which said means for retaining reinforcing strands comprises grooves in the surface of said swivel means between said threaded opening and each of said side frames.
The anchor device of claim 2 in which said swivel means further comprises:
a central portion defining said threaded opening for engaging said anchor bolt, integral axle portions journalled in said side frame elements, and grooved rollers journalled on each of said axle portions.
The anchor device of claim 2 in which the anchor means comprises a second threaded anchor bolt, and said means for engaging the anchor means comprises a second threaded transverse opening in said swivel means for receiving said second threaded anchor bolt.
A hold-down anchor device, engageable by an anchor means traversing a mold wall, for holding the reinforcing strands of a prestressed concrete building element in position in the mold while the strands are tensioned, the mold filled with concrete, and the concrete allowed to set, comprising:
a pair of side frame elements disposed parallel to each other and positionable generally vertically in the mold, a plurality of strand hold-down means extending transversely between said side frame elements, and swivel means pivotally secured to the lower ends of said side frame elements and having means for engaging the anchor means, said swivel means further comprising means for retaining reinforcing strands near said ends of said side frame elements such that said strands are at least as low as the projection of said side frame elements below said swivel-means.
The anchor device of claim 1 in which the anchor means comprises a threaded anchor bolt, and said means for engaging the anchor means comprises a threaded transverse opening in said swivel means for receiving said threaded anchor bolt.
The anchor device of claim 2 in which said means for retaining reinforcing strands comprises grooves in the surface of said swivel means between said threaded opening and each of said side frames.
The anchor device of claim 2 in which said swivel means further comprises:
a central portion defining said threaded opening for engaging said anchor bolt, integral axle portions journalled in said side frame elements, and grooved rollers journalled on each of said axle portions.
The anchor device of claim 2 in which the anchor means comprises a second threaded anchor bolt, and said means for engaging the anchor means comprises a second threaded transverse opening in said swivel means for receiving said second threaded anchor bolt.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7727444A FR2365031A1 (en) | 1976-09-15 | 1977-09-12 | Fuel system for petrol engine - has vaporisation chamber, next to fuel tank, through which fuel rises by capillary attraction |
| JP11003477A JPS5335821A (en) | 1976-09-15 | 1977-09-14 | Method and device for fuel supply to internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64848776A | 1976-01-12 | 1976-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1048747A true CA1048747A (en) | 1979-02-20 |
Family
ID=24600986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA76261269A Expired CA1048747A (en) | 1976-01-12 | 1976-09-15 | Swivel hold-down device |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1048747A (en) |
| DE (1) | DE2659477A1 (en) |
| GB (1) | GB1569824A (en) |
-
1976
- 1976-09-15 CA CA76261269A patent/CA1048747A/en not_active Expired
- 1976-12-30 DE DE19762659477 patent/DE2659477A1/en not_active Withdrawn
-
1977
- 1977-01-11 GB GB102677A patent/GB1569824A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1569824A (en) | 1980-06-18 |
| DE2659477A1 (en) | 1977-07-21 |
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