CA1204309A - Screw clamp pins - Google Patents
Screw clamp pinsInfo
- Publication number
- CA1204309A CA1204309A CA000412461A CA412461A CA1204309A CA 1204309 A CA1204309 A CA 1204309A CA 000412461 A CA000412461 A CA 000412461A CA 412461 A CA412461 A CA 412461A CA 1204309 A CA1204309 A CA 1204309A
- Authority
- CA
- Canada
- Prior art keywords
- branches
- screw clamp
- clamp pin
- outer body
- spreader
- 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
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B31/00—Hand tools for applying fasteners
- B25B31/005—Hand tools for applying fasteners for temporarily connecting sheets before or during assembly operations
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
- Clamps And Clips (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
- Connection Of Plates (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
ASTRACT OF THE DISCLOSURE
There are provided screw clamp pins such as used in the aeronautic industry and more particularly screw clamp pins having characteristics suitable for making them more efficient. Such clamp pins comprise an outer body having a lower portion of plastic material and an upper metallic portion including an outer hexagonal part and an inner stepped portion as well as a threaded part formed with a thread thereon, of the "artillery" type in its central zone ; said upper portion being axially fitted in by its central threaded portion into the plastic lower portion thereby resulting in the immobilization of branches of the clamp pin and of a spreader therefor in addition to the fixing together of both of said lower and upper portions of the outer body.
There are provided screw clamp pins such as used in the aeronautic industry and more particularly screw clamp pins having characteristics suitable for making them more efficient. Such clamp pins comprise an outer body having a lower portion of plastic material and an upper metallic portion including an outer hexagonal part and an inner stepped portion as well as a threaded part formed with a thread thereon, of the "artillery" type in its central zone ; said upper portion being axially fitted in by its central threaded portion into the plastic lower portion thereby resulting in the immobilization of branches of the clamp pin and of a spreader therefor in addition to the fixing together of both of said lower and upper portions of the outer body.
Description
:~Z043~9 ~
BACKGROUND OF THE INVENTION
1 The present invention relate~ to screw clamping pins such as those encountered in the aeronautic industr~ and more particularly to specificities of such clamping pins, which make them more efficient.
The problems of manufacturing costs are as known sig-nificant factors since enormous ~uantities of clamp pins are used for example during the manufacturing of a heavy tonnage aeroplane. The costs result from their design itself which may be adapted for complete automatization mounting thereof, on the one hand~ and on the other hand, the nature of the materials used for their fabrication.
Thus, cheap filled plastic materials having good pro-perties of mass moulding may be used; they also have an ex-ternal attractive appearance and colouration in the bulk to enable them to be identified for visual selection of their diameters and/or lengths.
Unfortunately, plastic materials have little mechanical strength much lower than metals, which causes a certain number of disadvantages.
The prior art teaches in French patent No. 1,433,662 or U.S. patent Nos. 2,365,787 and 2,345,817 a method of implement-ing clamp pins between a lower outer body member made e.g. of plastic material and a corresponding upper outer body member made e.g. of metal, but the connecting method used based on the ?5 ~imple insertion of said members into one another is not eompatible with the novel automatic extraction deviees for elamp pins such as illustrated for example in the Applicant's Canadian patent applieation serial number 409,334 filed on August 12, 1982. Such devices conjointly rest on the rearward portion of the hex.lgon of the clamp pin body and on the assemb-ly surface, thereby obviously running the risk of disconnection of both of said body members.
SUMMARY OF THE INVENTION
In order to remedy this first disadvantage, it is proposed aecording to the invention, to provide in a clamp pin, a speeific method of connecting a lower outer member of -,. ..A
~2043~9 1 plastic material, and its corresponding upper outer member of metalO
Such a connection is provided by a special kind of threading to enable the metallic hexagonal member to be axially fitted by compression into the plastic member, thereby providing the advantage of simplifying and possibly automatizing the mounting thereof, while permitting sub-sequent disassembly and reassembly, for example, with a view to eliminating the rubbery interposition product or replacing damaged clamp pin portions.
In the second place, there is also proposed accord-ing to the invention a unique anchoring method for the spreader of the clamp pin branches, which results from the above mentioned specific connecting method applied to both of said members.
The invention will now be better understood in the following description of a clamping pin by reference to the following figures contained in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a partial longitudinal cross section of the screw clamp pin at full insertion in the materials to be clamped;
Fig. 2 show~s a side view of the screw clamp pin shown in Fig. l;
Fig. 3 shows a partial longitudinal cross section - of the screw clamp pin of Fig. 1 in final clamping position;
Fig. 4 shows an enlarged partial longitudinal cross section of the upper and lower outer body of the screw clamp pin of Figs. 1, 2 and 3 illustrating the special thread type con~iguration on these members.
DESCRIPTON OF THE INVENTION
. ~
A screw clamping pin as shown in Figures 1, 2 and 3 necessarily comprises a pair of clamping branches 1 and 2, and a branch spreader 3, which both are disposed in the hole 4 formed in the assembly 5, with a body denoted as a whole by 6 resting on the assembly surface 7.
~.' 12043~9 1 On the body 6 of the clamp pin there is mounted a spring 8 through the center of which passes a rod denoted as a whole by 9, and a supporting washer 10 provided a seat for a nut 11 arrested in abutting relationship by an end cap 12~
The rod 9 includes on the one side a smooth part at the bottom o the thread 9a thereo~ to enable the nut 11 to turn idle, and on the other side, a hexagonal part 9b which is longitudinally slidable in a corresponding longitudinal female portion 6c formed in body 6.
Said rod 9 is terminated by a part 9c which is made of-a material capable of being crimped so that it may clampingly surround end portions of branches 1 and 2, which are adapted to maintain the radial positioning of the spreader 3, disposed therebetween.
The body 6 comprises an upper metallic member 6a having on the one side an outer hexagon and on the other side, an inner stepped portion the function of which will be explained hereinafter.
The specific connecting method according to the invention which is used at 13 results from the provision of a male member formed with a thread thereon of the so-called "artillery" type, in its central area 6a, and axially force fitted in the plastic sleeve constituting the portion 6b.
The essential characteristics of this type of thread located on male member 6a and female member 6b is that the, otherwise helical, thread comprises flanks 74a on one side of the thread which are substantially perpendicular to the longitudinal axis of the screw clamp pin 75, as shown in Fig. 4, and on the other side of the thread are thread flanks 74b inclined in the same way as the usual thread flanks.
In this way the hexagonal member 6a can be positioned merely by driving it axially into the member 6b while it can be subsequently easily removed therefrom by the usual unscrewing.
.
~LZf)4309 1 The holding in position of the spreader 3 simply results from the positioning of members 6a and 6b by making the latter tighten a first washer 14 therebetween, then putting the branches 3a and 3b of said spreader between said washer 14 and another washer 15, in alignment with the stepped portion 16 formed in the member 6a such that the members axe interlocked as soon as both of said members 6a and 6b are assembled.
It will now be explained how the clamp pin is implemented in the same way as the known clamp pins without having the disadvantages thereof.
The positioning of the clamp pin into the hole 4 is effected when the nut 11 is totally unscrewed and the rod 9 is moved down to the maximum (this position sub-stantially corresponds to that of Figures 1 and 2).
The clamp pin is locked in rotation by a nose ofa screwing means (not shown) which clampingly surrounds the hexagon of member 6a.
After the nut 11 has been screwed on by the inner part of the nose of the screwing means (not shown), the rod 9 moves up again thereby resulting in the assembly 5 being tightened-by means of the ends la and 2a of branches 1 and 2, pushed apart by the spreader 3 as shown in Fig. 3.
The screwing is continued up to a predetermined torque to permit compression of the spring 8 which ensures tightening of the assembly 5 through its biasing force by energy recovery.
It is necessary to tighten the assembly because of the presence of a polymerizable interposition product between the sheets constituting the assembly.
After polymerization of the product, the clamp pin is pulled out of the hole ~ in a reversed sequence of steps by unscrewing the nut 11 thereby driving the rod 9 toward the assembly as shown in Figs. l and 2 and extracting the clamp pin, said extraction being carried out by provision of an application point at 17 under the hexagon of member 6a, and advantageously, another application point over the surface 7 of the assembly.
_ During said motions, rotation of ~rod 9 is prevented due to the presence of the hexagon 6c which receives the six-sided member 9b, thereby correlatively causing,branches 1 and 2 to be locked in rotation simultaneously wi:th spreader 3.
Summarizing, according to the invention, there ls proposed a clamping pin of improved design properties resulting in increased mechanical qualities as well as reduced manufacturing costs due more particularly to the nature of some of the materials used and the facilities for realizing automated mounting thereof.
The nature of the materials used is advantageously such that the upper member 6a is made of an electrolytically protected steel and the lower member 6h, of a plastic material "RILSAN" ( a Trade Mark of Aquitaine-Organico for chemical compositions such as a polyamide for moldings, extrusions, or coatings).
It will be understood that this invention was only described and represented in a preferential exemplifying mode of embodiment and that technical equivalents can be substituted for its constitutive parts without departing from the scope thereof.
~,
BACKGROUND OF THE INVENTION
1 The present invention relate~ to screw clamping pins such as those encountered in the aeronautic industr~ and more particularly to specificities of such clamping pins, which make them more efficient.
The problems of manufacturing costs are as known sig-nificant factors since enormous ~uantities of clamp pins are used for example during the manufacturing of a heavy tonnage aeroplane. The costs result from their design itself which may be adapted for complete automatization mounting thereof, on the one hand~ and on the other hand, the nature of the materials used for their fabrication.
Thus, cheap filled plastic materials having good pro-perties of mass moulding may be used; they also have an ex-ternal attractive appearance and colouration in the bulk to enable them to be identified for visual selection of their diameters and/or lengths.
Unfortunately, plastic materials have little mechanical strength much lower than metals, which causes a certain number of disadvantages.
The prior art teaches in French patent No. 1,433,662 or U.S. patent Nos. 2,365,787 and 2,345,817 a method of implement-ing clamp pins between a lower outer body member made e.g. of plastic material and a corresponding upper outer body member made e.g. of metal, but the connecting method used based on the ?5 ~imple insertion of said members into one another is not eompatible with the novel automatic extraction deviees for elamp pins such as illustrated for example in the Applicant's Canadian patent applieation serial number 409,334 filed on August 12, 1982. Such devices conjointly rest on the rearward portion of the hex.lgon of the clamp pin body and on the assemb-ly surface, thereby obviously running the risk of disconnection of both of said body members.
SUMMARY OF THE INVENTION
In order to remedy this first disadvantage, it is proposed aecording to the invention, to provide in a clamp pin, a speeific method of connecting a lower outer member of -,. ..A
~2043~9 1 plastic material, and its corresponding upper outer member of metalO
Such a connection is provided by a special kind of threading to enable the metallic hexagonal member to be axially fitted by compression into the plastic member, thereby providing the advantage of simplifying and possibly automatizing the mounting thereof, while permitting sub-sequent disassembly and reassembly, for example, with a view to eliminating the rubbery interposition product or replacing damaged clamp pin portions.
In the second place, there is also proposed accord-ing to the invention a unique anchoring method for the spreader of the clamp pin branches, which results from the above mentioned specific connecting method applied to both of said members.
The invention will now be better understood in the following description of a clamping pin by reference to the following figures contained in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a partial longitudinal cross section of the screw clamp pin at full insertion in the materials to be clamped;
Fig. 2 show~s a side view of the screw clamp pin shown in Fig. l;
Fig. 3 shows a partial longitudinal cross section - of the screw clamp pin of Fig. 1 in final clamping position;
Fig. 4 shows an enlarged partial longitudinal cross section of the upper and lower outer body of the screw clamp pin of Figs. 1, 2 and 3 illustrating the special thread type con~iguration on these members.
DESCRIPTON OF THE INVENTION
. ~
A screw clamping pin as shown in Figures 1, 2 and 3 necessarily comprises a pair of clamping branches 1 and 2, and a branch spreader 3, which both are disposed in the hole 4 formed in the assembly 5, with a body denoted as a whole by 6 resting on the assembly surface 7.
~.' 12043~9 1 On the body 6 of the clamp pin there is mounted a spring 8 through the center of which passes a rod denoted as a whole by 9, and a supporting washer 10 provided a seat for a nut 11 arrested in abutting relationship by an end cap 12~
The rod 9 includes on the one side a smooth part at the bottom o the thread 9a thereo~ to enable the nut 11 to turn idle, and on the other side, a hexagonal part 9b which is longitudinally slidable in a corresponding longitudinal female portion 6c formed in body 6.
Said rod 9 is terminated by a part 9c which is made of-a material capable of being crimped so that it may clampingly surround end portions of branches 1 and 2, which are adapted to maintain the radial positioning of the spreader 3, disposed therebetween.
The body 6 comprises an upper metallic member 6a having on the one side an outer hexagon and on the other side, an inner stepped portion the function of which will be explained hereinafter.
The specific connecting method according to the invention which is used at 13 results from the provision of a male member formed with a thread thereon of the so-called "artillery" type, in its central area 6a, and axially force fitted in the plastic sleeve constituting the portion 6b.
The essential characteristics of this type of thread located on male member 6a and female member 6b is that the, otherwise helical, thread comprises flanks 74a on one side of the thread which are substantially perpendicular to the longitudinal axis of the screw clamp pin 75, as shown in Fig. 4, and on the other side of the thread are thread flanks 74b inclined in the same way as the usual thread flanks.
In this way the hexagonal member 6a can be positioned merely by driving it axially into the member 6b while it can be subsequently easily removed therefrom by the usual unscrewing.
.
~LZf)4309 1 The holding in position of the spreader 3 simply results from the positioning of members 6a and 6b by making the latter tighten a first washer 14 therebetween, then putting the branches 3a and 3b of said spreader between said washer 14 and another washer 15, in alignment with the stepped portion 16 formed in the member 6a such that the members axe interlocked as soon as both of said members 6a and 6b are assembled.
It will now be explained how the clamp pin is implemented in the same way as the known clamp pins without having the disadvantages thereof.
The positioning of the clamp pin into the hole 4 is effected when the nut 11 is totally unscrewed and the rod 9 is moved down to the maximum (this position sub-stantially corresponds to that of Figures 1 and 2).
The clamp pin is locked in rotation by a nose ofa screwing means (not shown) which clampingly surrounds the hexagon of member 6a.
After the nut 11 has been screwed on by the inner part of the nose of the screwing means (not shown), the rod 9 moves up again thereby resulting in the assembly 5 being tightened-by means of the ends la and 2a of branches 1 and 2, pushed apart by the spreader 3 as shown in Fig. 3.
The screwing is continued up to a predetermined torque to permit compression of the spring 8 which ensures tightening of the assembly 5 through its biasing force by energy recovery.
It is necessary to tighten the assembly because of the presence of a polymerizable interposition product between the sheets constituting the assembly.
After polymerization of the product, the clamp pin is pulled out of the hole ~ in a reversed sequence of steps by unscrewing the nut 11 thereby driving the rod 9 toward the assembly as shown in Figs. l and 2 and extracting the clamp pin, said extraction being carried out by provision of an application point at 17 under the hexagon of member 6a, and advantageously, another application point over the surface 7 of the assembly.
_ During said motions, rotation of ~rod 9 is prevented due to the presence of the hexagon 6c which receives the six-sided member 9b, thereby correlatively causing,branches 1 and 2 to be locked in rotation simultaneously wi:th spreader 3.
Summarizing, according to the invention, there ls proposed a clamping pin of improved design properties resulting in increased mechanical qualities as well as reduced manufacturing costs due more particularly to the nature of some of the materials used and the facilities for realizing automated mounting thereof.
The nature of the materials used is advantageously such that the upper member 6a is made of an electrolytically protected steel and the lower member 6h, of a plastic material "RILSAN" ( a Trade Mark of Aquitaine-Organico for chemical compositions such as a polyamide for moldings, extrusions, or coatings).
It will be understood that this invention was only described and represented in a preferential exemplifying mode of embodiment and that technical equivalents can be substituted for its constitutive parts without departing from the scope thereof.
~,
Claims (4)
1. A screw clamp pin comprising:
an outer body, a central rod passing through said outer body and prevented from rotating by said outer body, a nut, a spring between said body and said nut mounted on a threaded portion of the central rod which is moreover narrower at one of its ends, a pair of staple branches crimped into the end of the central rod opposite its narrow end, a spreader lying between the staple branches, a washer between the nut and the spring, said screw clamp pin being characterized in that the outer body comprises a lower portion of plastics material and an upper metallic portion, said upper portion having an outer hexagonal socket head and an inner recess and further both upper and lower portions having a thread thereon comprised of thread flanks which are substantially perpendicular to a longitudinal axis passing through the center of the screw clamp pin, said upper portion being axially fitted into the lower plastics portion to cause securement of the upper body portion to the lower body portion in addition to immobilization of the branches and of the spreader which results from the branches of the spreader being held firstly by a first washer located between the end of the upper portion and the inner bottom of the lower portion, then secondly by a second washer located against the inner recess in the upper portion.
an outer body, a central rod passing through said outer body and prevented from rotating by said outer body, a nut, a spring between said body and said nut mounted on a threaded portion of the central rod which is moreover narrower at one of its ends, a pair of staple branches crimped into the end of the central rod opposite its narrow end, a spreader lying between the staple branches, a washer between the nut and the spring, said screw clamp pin being characterized in that the outer body comprises a lower portion of plastics material and an upper metallic portion, said upper portion having an outer hexagonal socket head and an inner recess and further both upper and lower portions having a thread thereon comprised of thread flanks which are substantially perpendicular to a longitudinal axis passing through the center of the screw clamp pin, said upper portion being axially fitted into the lower plastics portion to cause securement of the upper body portion to the lower body portion in addition to immobilization of the branches and of the spreader which results from the branches of the spreader being held firstly by a first washer located between the end of the upper portion and the inner bottom of the lower portion, then secondly by a second washer located against the inner recess in the upper portion.
2. A screw clamp pin according to claim 1, characterized in that the upper metallic portion is made of electrolytically protected steel.
3. A screw clamp pin according to claim 1 and 3, characterized in that the plastics material of the lower
3. A screw clamp pin according to claim 1 and 3, characterized in that the plastics material of the lower
Claim 3 continued....
portion is colored to respond to a given code for the diameter of the staple branches.
portion is colored to respond to a given code for the diameter of the staple branches.
4. A screw clamping pin according to claim 1 and 3, characterized in that the plastics material of the lower portion is colored to respond to a given code for the length of the staple branches.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8118309A FR2513708A1 (en) | 1981-09-29 | 1981-09-29 | SCREW JOINTING SCREW |
| FR8118309 | 1981-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1204309A true CA1204309A (en) | 1986-05-13 |
Family
ID=9262561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000412461A Expired CA1204309A (en) | 1981-09-29 | 1982-09-29 | Screw clamp pins |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0076725B1 (en) |
| JP (1) | JPS5866674A (en) |
| CA (1) | CA1204309A (en) |
| DE (1) | DE3262690D1 (en) |
| FR (1) | FR2513708A1 (en) |
| IL (1) | IL66859A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2919691B1 (en) | 2007-08-03 | 2009-10-30 | Lisi Aerospace Soc Par Actions | SCRAPPING STAPLER AND USE THEREOF FOR TEMPORARILY FIXING A DRILLING GRID ON ASSEMBLED ELEMENTS |
| FR2927675B1 (en) | 2008-02-19 | 2013-02-08 | Lisi Aerospace | PROVISIONAL AND REUSABLE FIXING DEVICE FOR THE PRE-ASSEMBLY OF AT LEAST TWO STRUCTURAL ELEMENTS PRE-PRINTED. |
| CN106181862A (en) * | 2016-08-18 | 2016-12-07 | 无锡市中捷减震器有限公司 | Riveting pin assembling jig |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1433662A (en) * | 1965-03-18 | 1966-04-01 | Bayswater Motors Ltd | Sheet clamping device |
| FR1491450A (en) * | 1966-06-28 | 1967-08-11 | Improvements made to screwing or unscrewing mandrels, in particular for fitting and removing sheet metal clips | |
| FR2181216A5 (en) * | 1972-04-21 | 1973-11-30 | Bouzounie Lucien |
-
1981
- 1981-09-29 FR FR8118309A patent/FR2513708A1/en active Granted
-
1982
- 1982-09-23 EP EP82401725A patent/EP0076725B1/en not_active Expired
- 1982-09-23 DE DE8282401725T patent/DE3262690D1/en not_active Expired
- 1982-09-24 IL IL66859A patent/IL66859A/en active IP Right Grant
- 1982-09-28 JP JP57169461A patent/JPS5866674A/en active Pending
- 1982-09-29 CA CA000412461A patent/CA1204309A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2513708A1 (en) | 1983-04-01 |
| IL66859A (en) | 1986-12-31 |
| JPS5866674A (en) | 1983-04-20 |
| FR2513708B1 (en) | 1984-01-06 |
| EP0076725A1 (en) | 1983-04-13 |
| IL66859A0 (en) | 1982-12-31 |
| DE3262690D1 (en) | 1985-04-25 |
| EP0076725B1 (en) | 1985-03-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |