CA1040600A - Screw strip and process of its production - Google Patents
Screw strip and process of its productionInfo
- Publication number
- CA1040600A CA1040600A CA245,738A CA245738A CA1040600A CA 1040600 A CA1040600 A CA 1040600A CA 245738 A CA245738 A CA 245738A CA 1040600 A CA1040600 A CA 1040600A
- Authority
- CA
- Canada
- Prior art keywords
- screw
- sleeves
- strip
- screws
- sleeve
- 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
- 238000000034 method Methods 0.000 title claims description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000000463 material Substances 0.000 claims abstract description 19
- 229920003023 plastic Polymers 0.000 claims abstract description 14
- 239000004033 plastic Substances 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229920002457 flexible plastic Polymers 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B27/00—Bolts, screws, or nuts formed in integral series but easily separable, particularly for use in automatic machines
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Packages (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Package Frames And Binding Bands (AREA)
- Buffer Packaging (AREA)
- Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
A unitary holding strip made of plastics material for retaining a plurality of screws in a row, the screws having longitudinal axes and a threading with a given outer thread dia-meter. The unitary holding strip of the invention includes a plurality of screw holding sleeves and lands interconnecting the sleeves which extend along a portion of the threaded length of the respective screw in the axial direction thereof, the lands and sleeves having a wall thickness substantially smaller than the outer thread diameter, and is characterized in that the sleeves comprise inwardly facing screw threads for receiving the screw threading and that they further comprise along one side thereof, substantially between the lands, an area of reduced strength such that a screw which is being threaded into a workpiece is automatically separated from its sleeve while simultaneously maintaining the length of the strip substantial-ly intact and while guiding the screw by the inwardly facing threads of the respective sleeve.
A unitary holding strip made of plastics material for retaining a plurality of screws in a row, the screws having longitudinal axes and a threading with a given outer thread dia-meter. The unitary holding strip of the invention includes a plurality of screw holding sleeves and lands interconnecting the sleeves which extend along a portion of the threaded length of the respective screw in the axial direction thereof, the lands and sleeves having a wall thickness substantially smaller than the outer thread diameter, and is characterized in that the sleeves comprise inwardly facing screw threads for receiving the screw threading and that they further comprise along one side thereof, substantially between the lands, an area of reduced strength such that a screw which is being threaded into a workpiece is automatically separated from its sleeve while simultaneously maintaining the length of the strip substantial-ly intact and while guiding the screw by the inwardly facing threads of the respective sleeve.
Description
~040600 ~ This invention is concerned with a unitary hol~ing strip made of plastics material for retaining a plurality of screws in a row, of the type including a plurality of screw holding sleeves and lands interconnecting the sleeves which extend along a portion of the threaded length of the respective screw in the axial direc-tion thereof.
It is a known to connect screws to each other by a retaining belt of breakable plastic material. The screw strip formed in this way is placed in the known manner in the flat maga-zine of a screwing appliance in which the first screw togetherwith a part of the retaining belt is separated from the screw strip in the workpiece direction by a screw blade and is then screwed into the workpiece. Parts of the cut off retaining belt then drop onto the workpiece surface and from there get partly underneath the head of the screw which presses them into the work-piece surface. The parts lying loosely on the workpiece surface can be pressed into the surface when the screwing appliance moves onwards and can make their presence felt very inconveniently especially on planed and sanded surfaces of furniture and may even damage the surface. The cut off particles of the retaining belt can moreover settle in the guide channel of the screwing applicance and in the front part of the magazine and can noticeably impede ;~
the operation of the screwing appliance.
Another disadvantage of these known screw strips results from the fact that the screw is no longer guided safely in the cylindrical guide channel of the screwing appliance and / can tilt and is then screwed into the workpiece at an angle.
j~ To prevent this disadvantage guide jaws are required near the , guide channel which make the screwing appliance more expensive { 30 and can also lead to trouble.
It is an object of this invention to provide a screw holding strip as well as a process for its production, in which ::
' .
: `. ' . . : ' ::
, ~
1~40600 rh~ section surrounding the screw to be separated is not cut off from the remaining retaining belt with the screw and in which the screw is guided securely until it reaches the workpiece.
In accordance with the invention, there is thus provided a unitary holding strip made of plastics material for retaining a plurality of screws in a row, the screws having longitudinal axes and a threading with a given outer thread diameter. The unitary holding strip of the invention includes a plurality of screw holding sleeves and lands interconnecting the sleeves which extend along a portion of the threaded length of the respective screw in the axial direction thereof, the lands and sleeves having a wall thickness substantially smaller than the outer thread dia-meter, and is characterized in that the sleeves comprise inwardly facing screw threads for receiving the screw threading and that they further comprise along one side thereof, substantially between the lands, an area of reduced strength such that a screw which is being threaded into a workpiece is automatically separated from its sleeve while simultaneously maintaining the length of the strip substantially intact and while guiding the screw by the inwardly facing threads of the respective sleeve.
When the first screw is separated it turns in the inwardIy facing screw threads of the sleeve in the direction of the workpiece and is securely guided by the sleeve in the screwing direction. If the screw is provided with a head it can expand the sleeve when it reaches the sleeve during the screwing operation, in such a way that the screw can be screwed completely into the workpiece without damaging the retaining belt or strip. It is best if the retaining belt is made of a flexible plastic material, but other materials e.g. suitable metals or paper can also be used.
In a preferred embodiment of tlle invention, the sleeves have a given wall thickness on one side and a thinner wall thickness on the opposite side thereof, whereby the thinner wall ~ .
.
...... . . . .
rhickness provides the area of reduced strength. Alternatively, the sleeves may only partially surround the screws to form the area of reduced strength. The sleeve can thus be pressed sideways by - the screw head transversely to the screwing appliance, and it is then fractured at the area of reduced strength.
The undamaged empty retaining belt may leave the screwing appliance through a suitable opening and no residues canaccumulate on the workpiece surface.
According to another preferred embodiment, the area of reduced strength of the sleeve comprises gap means in the sleeve on one side thereof, whereby each sleeve surrounds its screw along the entire length of the sleeve and circumferentially outside the gap means. Preferably, the gap means comprises a longitudinal slot on the aforesaid side of the sleeve.
According to a further preferred embodiment, the sleeves enclose the screw threading with a peripheral angle within the range of about 210 to about 270, whereby the sleeves have longitudinally extending slots. Advantageously, all of the longi-tudinal slots extend on the same side of the strip.
The construction of a retaining belt with lands the wall thickness of which is smaller than the outer thread diameter of the screw and with sleeves having one side thinner than the i other side thereof helps on the one hand the retaining belt to bypass the screwing appliance and, on the other hand,enables the reduction of costs of the screwing appliance itself, by not requiring the use of guiding jaws.
The screw strip in accordance with the invention provides the further advantage that due to its flexibility, and the arrangement of the ribs in the center plane of the screw strip, the screw strip may be spirally wound or angularly. As a result, it is possible to employ the screw strip not only in flat magazines, but also in other forms of magazines. This provides '` ~7' .
104~)600 the advantage that, when a differently ~ormed magazine is provided, a larger number of screws can be processed in a screwing appliance, without the necessity of frequent reloading of the magazine.
The invention also relates to a process for the production of a unitary screw holding strip of the above type.
The process comprises arranging the screws in a row and in spaced parallel relationship with one another; extruding plastics ~aterial on said row of screws to form a strip engaging the screw threads; forming, with at least one pair of forming rollers, a screw retaining strip having sleeves interconnected by lands with a wall thickness substantially smaller than the outer thread diameter of the screws, and controlling feeding of said plastics material so that the sleeves comprise, along one side thereof with respect to said lands, an area of reduced strength. Such forming rollers are axially parallel, face one another on either side of the strip and are formed, at their periphery, with longitudinally extending grooves located so that one groove of one roller faces a groove of the other roller when said screws pass therebetween.
Preferred embodiments of the invention will now be des-cribed in greater detail with reference to the appended drawings, whrerein:
Figure 1 is a side view of a screw strip according to .
the invention;
Figure 2 shows a cross-section through the screw strip according to Fig. 1 along the line II-II;
Figures 3-5 illustrate the process of producing a screw strip according to the invention, Figures 3 and 4 representing the type of roller utilized; and Figure 6 shows a modification of the screw strip of the invention, where the sleeves completely surround the screws.
The screw strip 1 contains a nul~er of screws 2 which ~ h are provided with bodies 3, a screw thread 4 and in the present ~ ~ 4 ~ ~
~04~690 embodiment with screw heads 5. The screw strip according to the : invention can equally contain screws without he~ds or with scre~
bodies and screw threads which differ from the _ . . : : , . , . - ..
:. . : - ~ :
,. : . , . . , .. ~ . . , . i .
: - . : . ~ ': . :
. . . .. . ~ . .
:
embodiment. 1040600 The screws 3 are connected to each other by a retaining belt 6 of flexible plastic material which in the embodiment runs vertically to the longitudinal axis of the screws. However, in the case of screw strips the screws of which are in staggered arrangement, it can be slightly inclined towards the longitudinal axis of the screws.
The screw threads 4 are enclosed by sleeves 7 of the retaining belt 6 with a peripheral angle of 270 so that longitu-dinal slots 8 result in the sleeves 7 on one side of the screw strip 1. The sleeves 7 have a counter-thread 9 on their inside, which forms a mating thread to the screw thread 4. The wall thick-ness 10 of the sleeve 7 outside the screw thread 4 is smaller than the depth 11 of the screw thread 4.
; The sleeves 7 are connected to each other by integrated ribs 12 connected to the sleeves, the ribs 12 being arranged in the centre plane or the screw strip 1. The wall thickness 13 of the ribs 12 is smaller than the outside diameter 14 of the screw threa~ 4.
The right end of the sleeve of the screw strip illustra~
ted in F gs. 1 and 2 is shown without a screw in position. This depicts the undamaged form of the empty retaining belt or strip 6 as it leaves the screwing appliance by way of a suitable opening.
A conventional machine for the manufacture of fastener strips, known as a collator, may be employed in the formation of the screw strip in accordance with the invention. In the process of forming the screw strips, the screws 2 are suspended by their heads and arranged in a row ~or feeding to a forming device. In the forming device, they are entrained by the grooves of a circulating conveyor chain. In accordance with the inVention, when the strip 6 is formed of a flexible plastic material, the plastic material is extruded from a nozzle only onto one side of :.
104~600 T~ row of screws, to engage the screw threads of the screws.
The strip 6 is then formed into the shape illustrated in Figs. 1 and 2, by the use of at least one pair of forming rollers. As illustrated in Figs. 3 and 4, a forming roller 20 for this purpose is provided with one or more longitudinally extending semi-circular grooves 21. These grooves have radii greater than the radius of the screw thread, so that the plastically molded plastic material can be forced to penetrate into the threads of the screw thread 4 and also to surround the screw threads to form the sleeves. The rollers 20 may also be provided with an annular groove 22, or alternatively, with angular ribs, intersecting the longitudinal grooves 21, for forming the ribs 12.
The process in accordance with the invention is shown generally in Fig. 5, wherein the extruded unformed portion 25 of the strip is shown as being disposed only on one side of a screw
It is a known to connect screws to each other by a retaining belt of breakable plastic material. The screw strip formed in this way is placed in the known manner in the flat maga-zine of a screwing appliance in which the first screw togetherwith a part of the retaining belt is separated from the screw strip in the workpiece direction by a screw blade and is then screwed into the workpiece. Parts of the cut off retaining belt then drop onto the workpiece surface and from there get partly underneath the head of the screw which presses them into the work-piece surface. The parts lying loosely on the workpiece surface can be pressed into the surface when the screwing appliance moves onwards and can make their presence felt very inconveniently especially on planed and sanded surfaces of furniture and may even damage the surface. The cut off particles of the retaining belt can moreover settle in the guide channel of the screwing applicance and in the front part of the magazine and can noticeably impede ;~
the operation of the screwing appliance.
Another disadvantage of these known screw strips results from the fact that the screw is no longer guided safely in the cylindrical guide channel of the screwing appliance and / can tilt and is then screwed into the workpiece at an angle.
j~ To prevent this disadvantage guide jaws are required near the , guide channel which make the screwing appliance more expensive { 30 and can also lead to trouble.
It is an object of this invention to provide a screw holding strip as well as a process for its production, in which ::
' .
: `. ' . . : ' ::
, ~
1~40600 rh~ section surrounding the screw to be separated is not cut off from the remaining retaining belt with the screw and in which the screw is guided securely until it reaches the workpiece.
In accordance with the invention, there is thus provided a unitary holding strip made of plastics material for retaining a plurality of screws in a row, the screws having longitudinal axes and a threading with a given outer thread diameter. The unitary holding strip of the invention includes a plurality of screw holding sleeves and lands interconnecting the sleeves which extend along a portion of the threaded length of the respective screw in the axial direction thereof, the lands and sleeves having a wall thickness substantially smaller than the outer thread dia-meter, and is characterized in that the sleeves comprise inwardly facing screw threads for receiving the screw threading and that they further comprise along one side thereof, substantially between the lands, an area of reduced strength such that a screw which is being threaded into a workpiece is automatically separated from its sleeve while simultaneously maintaining the length of the strip substantially intact and while guiding the screw by the inwardly facing threads of the respective sleeve.
When the first screw is separated it turns in the inwardIy facing screw threads of the sleeve in the direction of the workpiece and is securely guided by the sleeve in the screwing direction. If the screw is provided with a head it can expand the sleeve when it reaches the sleeve during the screwing operation, in such a way that the screw can be screwed completely into the workpiece without damaging the retaining belt or strip. It is best if the retaining belt is made of a flexible plastic material, but other materials e.g. suitable metals or paper can also be used.
In a preferred embodiment of tlle invention, the sleeves have a given wall thickness on one side and a thinner wall thickness on the opposite side thereof, whereby the thinner wall ~ .
.
...... . . . .
rhickness provides the area of reduced strength. Alternatively, the sleeves may only partially surround the screws to form the area of reduced strength. The sleeve can thus be pressed sideways by - the screw head transversely to the screwing appliance, and it is then fractured at the area of reduced strength.
The undamaged empty retaining belt may leave the screwing appliance through a suitable opening and no residues canaccumulate on the workpiece surface.
According to another preferred embodiment, the area of reduced strength of the sleeve comprises gap means in the sleeve on one side thereof, whereby each sleeve surrounds its screw along the entire length of the sleeve and circumferentially outside the gap means. Preferably, the gap means comprises a longitudinal slot on the aforesaid side of the sleeve.
According to a further preferred embodiment, the sleeves enclose the screw threading with a peripheral angle within the range of about 210 to about 270, whereby the sleeves have longitudinally extending slots. Advantageously, all of the longi-tudinal slots extend on the same side of the strip.
The construction of a retaining belt with lands the wall thickness of which is smaller than the outer thread diameter of the screw and with sleeves having one side thinner than the i other side thereof helps on the one hand the retaining belt to bypass the screwing appliance and, on the other hand,enables the reduction of costs of the screwing appliance itself, by not requiring the use of guiding jaws.
The screw strip in accordance with the invention provides the further advantage that due to its flexibility, and the arrangement of the ribs in the center plane of the screw strip, the screw strip may be spirally wound or angularly. As a result, it is possible to employ the screw strip not only in flat magazines, but also in other forms of magazines. This provides '` ~7' .
104~)600 the advantage that, when a differently ~ormed magazine is provided, a larger number of screws can be processed in a screwing appliance, without the necessity of frequent reloading of the magazine.
The invention also relates to a process for the production of a unitary screw holding strip of the above type.
The process comprises arranging the screws in a row and in spaced parallel relationship with one another; extruding plastics ~aterial on said row of screws to form a strip engaging the screw threads; forming, with at least one pair of forming rollers, a screw retaining strip having sleeves interconnected by lands with a wall thickness substantially smaller than the outer thread diameter of the screws, and controlling feeding of said plastics material so that the sleeves comprise, along one side thereof with respect to said lands, an area of reduced strength. Such forming rollers are axially parallel, face one another on either side of the strip and are formed, at their periphery, with longitudinally extending grooves located so that one groove of one roller faces a groove of the other roller when said screws pass therebetween.
Preferred embodiments of the invention will now be des-cribed in greater detail with reference to the appended drawings, whrerein:
Figure 1 is a side view of a screw strip according to .
the invention;
Figure 2 shows a cross-section through the screw strip according to Fig. 1 along the line II-II;
Figures 3-5 illustrate the process of producing a screw strip according to the invention, Figures 3 and 4 representing the type of roller utilized; and Figure 6 shows a modification of the screw strip of the invention, where the sleeves completely surround the screws.
The screw strip 1 contains a nul~er of screws 2 which ~ h are provided with bodies 3, a screw thread 4 and in the present ~ ~ 4 ~ ~
~04~690 embodiment with screw heads 5. The screw strip according to the : invention can equally contain screws without he~ds or with scre~
bodies and screw threads which differ from the _ . . : : , . , . - ..
:. . : - ~ :
,. : . , . . , .. ~ . . , . i .
: - . : . ~ ': . :
. . . .. . ~ . .
:
embodiment. 1040600 The screws 3 are connected to each other by a retaining belt 6 of flexible plastic material which in the embodiment runs vertically to the longitudinal axis of the screws. However, in the case of screw strips the screws of which are in staggered arrangement, it can be slightly inclined towards the longitudinal axis of the screws.
The screw threads 4 are enclosed by sleeves 7 of the retaining belt 6 with a peripheral angle of 270 so that longitu-dinal slots 8 result in the sleeves 7 on one side of the screw strip 1. The sleeves 7 have a counter-thread 9 on their inside, which forms a mating thread to the screw thread 4. The wall thick-ness 10 of the sleeve 7 outside the screw thread 4 is smaller than the depth 11 of the screw thread 4.
; The sleeves 7 are connected to each other by integrated ribs 12 connected to the sleeves, the ribs 12 being arranged in the centre plane or the screw strip 1. The wall thickness 13 of the ribs 12 is smaller than the outside diameter 14 of the screw threa~ 4.
The right end of the sleeve of the screw strip illustra~
ted in F gs. 1 and 2 is shown without a screw in position. This depicts the undamaged form of the empty retaining belt or strip 6 as it leaves the screwing appliance by way of a suitable opening.
A conventional machine for the manufacture of fastener strips, known as a collator, may be employed in the formation of the screw strip in accordance with the invention. In the process of forming the screw strips, the screws 2 are suspended by their heads and arranged in a row ~or feeding to a forming device. In the forming device, they are entrained by the grooves of a circulating conveyor chain. In accordance with the inVention, when the strip 6 is formed of a flexible plastic material, the plastic material is extruded from a nozzle only onto one side of :.
104~600 T~ row of screws, to engage the screw threads of the screws.
The strip 6 is then formed into the shape illustrated in Figs. 1 and 2, by the use of at least one pair of forming rollers. As illustrated in Figs. 3 and 4, a forming roller 20 for this purpose is provided with one or more longitudinally extending semi-circular grooves 21. These grooves have radii greater than the radius of the screw thread, so that the plastically molded plastic material can be forced to penetrate into the threads of the screw thread 4 and also to surround the screw threads to form the sleeves. The rollers 20 may also be provided with an annular groove 22, or alternatively, with angular ribs, intersecting the longitudinal grooves 21, for forming the ribs 12.
The process in accordance with the invention is shown generally in Fig. 5, wherein the extruded unformed portion 25 of the strip is shown as being disposed only on one side of a screw
2. The strip and the screws 2 are advanced to the right, as indi-cated by the arrow 26, to pass between a pair of rollers 27 of the type illustrated in Figs. 3 and 4. The semi-circular longi-tudinally extending grooves 28 of these rollers are positioned to be in alignment as the screw 2 passes therebetween. As a consequence, the grooves 28 form the sleeves, by pressing the material of the strip 6 into the threads of the screws, and by -plastically forcing the material to partially surround the oppo-site side of the screw.
It is, of course, apparent that the amount of plastic material extruded onto the sides of the screws is metered, such that a sufficient amount of plastic material is provided to enable the sleeve to be formed to surround the screw to the desired extent. Thus, as discussed above, it is preferred that the sleeve surrounds the screw through an angle of between 210 and 27~.
In the modification of the screw strip in accordance with the invention as illustrated in Fig. 6, the sleeves 30 of the 1" 3~
~ 6 -- .~ -, -- ~
` 1~4~)6(~0 screw strip are formed to completely surround the screws. In this arrangement, the portion 31 of the sleeves on one side of the screw strip is thicker than at least a portion 32 of the sleeve on the other side of the screw strip. The interconnecting ribs 33 are formed, as in the previously described embodiment of the invention, to have thicknesses less than the diameter of the threads of the screw 34.
In this embodiment of the invention, since one side of the sleeve is thinner than the other side thereof, the thinner side is broken by the advancement of the head of the screw in a screwing operation. Due to the flexibility of the strip, however, the other side of the sleeve is not broken, so that the plastic strip may be fed from the screwing appliance, through a suitable opening as in the above example, without leaving portions thereof on the surface of the workpiece.
::;
,, . ;
,, ~ .
~ ' ., - 7 - ~
, .
.
It is, of course, apparent that the amount of plastic material extruded onto the sides of the screws is metered, such that a sufficient amount of plastic material is provided to enable the sleeve to be formed to surround the screw to the desired extent. Thus, as discussed above, it is preferred that the sleeve surrounds the screw through an angle of between 210 and 27~.
In the modification of the screw strip in accordance with the invention as illustrated in Fig. 6, the sleeves 30 of the 1" 3~
~ 6 -- .~ -, -- ~
` 1~4~)6(~0 screw strip are formed to completely surround the screws. In this arrangement, the portion 31 of the sleeves on one side of the screw strip is thicker than at least a portion 32 of the sleeve on the other side of the screw strip. The interconnecting ribs 33 are formed, as in the previously described embodiment of the invention, to have thicknesses less than the diameter of the threads of the screw 34.
In this embodiment of the invention, since one side of the sleeve is thinner than the other side thereof, the thinner side is broken by the advancement of the head of the screw in a screwing operation. Due to the flexibility of the strip, however, the other side of the sleeve is not broken, so that the plastic strip may be fed from the screwing appliance, through a suitable opening as in the above example, without leaving portions thereof on the surface of the workpiece.
::;
,, . ;
,, ~ .
~ ' ., - 7 - ~
, .
.
Claims (8)
1. In a unitary holding strip made of plastics mate-rial for retaining a plurality of screws in a row, said screws having longitudinal axes and a threading with a given outer thread diameter, said unitary holding strip including a plurali-ty of screw holding sleeves and lands interconnecting said sleeves which extend along a portion of the threaded length of the respective screw in the axial direction thereof, said lands and sleeves having a wall thickness substantially smaller than said outer thread diameter, the improvement wherein said sleeves comprise inwardly facing screw threads for receiving said screw threading, said sleeves further comprising along one side there-of, substantially between said lands, an area of reduced strength such that a screw which is being threaded into a workpiece is automatically separated from its sleeve while simultaneously maintaining the length of the strip substantially intact and while guiding the screw by said inwardly facing screw threads of the respective sleeve.
2. The strip of claim 1, wherein said sleeves have a given wall thickness on one side and a thinner wall thickness on the opposite side of said sleeves, whereby the thinner wall thickness provides said area of reduced strength.
3. The strip of claim 1, wherein said sleeves only partially surround said screws to form said area of reduced strength.
4. The strip of claim 3, wherein sleeves enclose the screw threading with a peripheral angle within the range of about 210° to about 270°, whereby the sleeves have longitudinally extending slots.
5. The strip of claim 4, wherein all of said longitu-dinal slots extend on the same side of said strip.
6. The strip of claim 1, wherein said area of reduced strength of said sleeve comprises gap means in said sleeve on one side of the sleeve, whereby each sleeve surrounds its screw along the entire length of the sleeve and circumferentially out-side said gap means.
7. The strip of claim 6, wherein said gap means com-prise a longitudinal slot on said one side of the sleeve.
8. A process for the production of a unitary holding strip made of plastics material for retaining a plurality of screws in a row, said screws having longitudinal axes and threads with a given outer thread diameter, said unitary holding strip to include a plurality of screw holding sleeves and lands inter-connecting said sleeves which extend along a portion of the threaded length of the respective screw in the axial direction thereof, which process comprises: arranging the screws in a row and in spaced parallel relationship with one another; extruding plastics material on said row of screws to form a strip engaging the screw threads; forming, with at least one pair of forming rollers, a screw retaining strip having sleeves interconnected by lands with a wall thickness substantially smaller than the outer thread diameter of the screws, and controlling feeding of said plastics material so that the sleeves comprise, along one side thereof with respect to said lands, an area of reduced strength;
wherein said forming rollers are axially parallel, face one another on either side of said strip and are formed, at their periphery, with longitudinally extending grooves located so that one groove of one roller faces a groove of the other roller when said screws pass therebetween.
wherein said forming rollers are axially parallel, face one another on either side of said strip and are formed, at their periphery, with longitudinally extending grooves located so that one groove of one roller faces a groove of the other roller when said screws pass therebetween.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752512825 DE2512825A1 (en) | 1975-03-22 | 1975-03-22 | Automatic driver screw holding strip - has threaded sleeves accommodating shanks with connecting ribs thinner than shanks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1040600A true CA1040600A (en) | 1978-10-17 |
Family
ID=5942222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA245,738A Expired CA1040600A (en) | 1975-03-22 | 1976-02-13 | Screw strip and process of its production |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS51119456A (en) |
| CA (1) | CA1040600A (en) |
| DE (2) | DE2512825A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4930630A (en) * | 1989-06-15 | 1990-06-05 | Habermehl Gordon L | Screw strip with washers |
| US5622024A (en) * | 1993-06-23 | 1997-04-22 | Habermehl; Gordon L. | Collated drywall screws |
| US5758768A (en) * | 1996-06-28 | 1998-06-02 | G. Lyle Habermehl | Supporting deflective screwstrip |
| US5870933A (en) * | 1995-08-07 | 1999-02-16 | Habermehl; G. Lyle | Advance mechanism for collated screwdriver |
| US5921736A (en) * | 1997-06-09 | 1999-07-13 | Habermehl; Gordon Lyle | Collated drywall screws |
| US6074149A (en) * | 1999-06-30 | 2000-06-13 | G. Lyle Habermehl | False threadscrew and screwstrip |
| US6601480B1 (en) | 2000-09-15 | 2003-08-05 | G. Lyle Habermehl | Autofeed screwdriver for screws with flat head bottoms |
| US7051875B2 (en) | 2003-12-17 | 2006-05-30 | Simpson Strong-Tie Company, Inc. | Holding strap for curved screwstrip |
| EP2394791A1 (en) | 2002-11-08 | 2011-12-14 | Simpson Strong-Tie Co., Inc. | Split nosepiece for driving collated screws |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2656445A1 (en) * | 1976-12-14 | 1978-06-15 | Reich Maschf Gmbh Karl | SCREW STRIPS WITH SLEEVES ENGAGING INTO THE SCREW THREADS |
| JPS5541637U (en) * | 1978-09-13 | 1980-03-17 | ||
| FR2553694B1 (en) * | 1983-10-19 | 1991-12-13 | Sfs Stadler Ag | STORAGE STRIP FOR SCREWS AND DRIVING APPARATUS FOR SCREWS DELIVERED IN THE STORAGE STRIP |
| JPS61115023U (en) * | 1984-12-27 | 1986-07-21 | ||
| DE3807368A1 (en) * | 1988-03-07 | 1989-09-21 | Fischer Artur Werke Gmbh | MAGAZINE WITH SEVERAL SPREADING DOWELS |
| DE4424750C1 (en) * | 1994-07-13 | 1996-02-01 | Sfs Ind Holding Ag | Package for bar-shaped components, e.g. bolts, nails etc. |
| ATE166627T1 (en) * | 1993-12-27 | 1998-06-15 | Sfs Ind Holding Ag | PACKAGING FOR BAR-SHAPED PARTS |
| DE4344679C2 (en) * | 1993-12-27 | 1996-05-30 | Sfs Ind Holding Ag | Packaging for rod-shaped parts |
| US5934465A (en) * | 1996-10-22 | 1999-08-10 | Thomas & Betts Corporation | Cable tie bandoliers for use with automatic tools |
| US5967316A (en) * | 1997-10-22 | 1999-10-19 | Thomas & Betts International, Inc. | Cable tie bandoliers for use with automatic tools |
| DE102008031475A1 (en) | 2008-07-03 | 2010-01-14 | A. Raymond Et Cie | Device for holding elements in a successive arrangement in a longitudinal direction |
| DE102010060239B4 (en) | 2010-10-28 | 2014-09-25 | Sfs Intec Holding Ag | Magazine device and designated Magazinierstreifen |
| JP7192491B2 (en) * | 2018-12-27 | 2022-12-20 | マックス株式会社 | interlocking fastener |
-
1975
- 1975-03-22 DE DE19752512825 patent/DE2512825A1/en active Pending
-
1976
- 1976-02-13 CA CA245,738A patent/CA1040600A/en not_active Expired
- 1976-03-22 JP JP3118776A patent/JPS51119456A/en active Granted
- 1976-12-14 DE DE19767639013 patent/DE7639013U1/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4930630A (en) * | 1989-06-15 | 1990-06-05 | Habermehl Gordon L | Screw strip with washers |
| US5622024A (en) * | 1993-06-23 | 1997-04-22 | Habermehl; Gordon L. | Collated drywall screws |
| US5870933A (en) * | 1995-08-07 | 1999-02-16 | Habermehl; G. Lyle | Advance mechanism for collated screwdriver |
| US5758768A (en) * | 1996-06-28 | 1998-06-02 | G. Lyle Habermehl | Supporting deflective screwstrip |
| US5921736A (en) * | 1997-06-09 | 1999-07-13 | Habermehl; Gordon Lyle | Collated drywall screws |
| US6074149A (en) * | 1999-06-30 | 2000-06-13 | G. Lyle Habermehl | False threadscrew and screwstrip |
| US6601480B1 (en) | 2000-09-15 | 2003-08-05 | G. Lyle Habermehl | Autofeed screwdriver for screws with flat head bottoms |
| DE10145703B4 (en) * | 2000-09-15 | 2017-10-19 | Simpson Strong-Tie Co., Inc. | Automatic screwdriver for screws with flat head bases |
| EP2394791A1 (en) | 2002-11-08 | 2011-12-14 | Simpson Strong-Tie Co., Inc. | Split nosepiece for driving collated screws |
| US7051875B2 (en) | 2003-12-17 | 2006-05-30 | Simpson Strong-Tie Company, Inc. | Holding strap for curved screwstrip |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5648727B2 (en) | 1981-11-17 |
| JPS51119456A (en) | 1976-10-20 |
| DE7639013U1 (en) | 1978-10-12 |
| DE2512825A1 (en) | 1976-09-30 |
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