GB2385294A

GB2385294A - Improvements to a banding tool

Info

Publication number: GB2385294A
Application number: GB0300980A
Authority: GB
Inventors: Steven John Blanks; Paul Andrew Gingell; Andrew William Dunkerley
Original assignee: Spirent PLC
Current assignee: Spirent PLC
Priority date: 2002-02-19
Filing date: 2003-01-16
Publication date: 2003-08-20
Anticipated expiration: 2023-01-16
Also published as: GB2385294B; GB0203966D0; GB0300980D0

Abstract

A banding tool for tensioning, cutting and fastening the head of a metal banding fastening comprises three rotary shafts 29, 35, 45 which are driven in sequence to respectively tension and temporarily clamp the strap 14 of the fastening, cut the strap 14 remote from the head 10 of the fastening, and fold the cut strap back over the head 10. The cut strap 14 is positioned on an inclined surface 23 of the tool prior to cutting. The strap 14 is then conveniently folded by advancing a folding bar 46 towards the underside of the strap 14 in the direction of the head 10. A jaw 21 on the tool constrains the head 10 against movement in the direction of movement of the folding bar 46. V-shaped projections on the jaw 21 of the tool are arranged to engage with complimentary v-shaped notches 60 in the edge of the head 10, to ensure that the fastening engages correctly with the tool and to prevent the fastening from displacing during tensioning.

Description

Banding Tool This invention relates to a tool for tightening and securing metal banding fasteners.

Metal banding fasteners are known for securing articles together securely. One such fastener comprises a flat head or buckle 10, as shown in Figure 1 of the drawings, which is formed of a stamped sheet of metal. A bridge 11 is formed in the head to define a passageway 12 which is directed across the head 10. A pair of spaced upstanding tabs lés are formed on the outer end of the head.

A length of metal banding in the form of a flat strap 14 is cut from a roll and fastened at one end to the head 10, as shown in Figure 2 of the drawings. The strap 14 is fastened to the head 10 by feeding it across the head 10 from its inner end to its outer end, through the passageway 12. The strap is then folded downwardly through 1800 around the outer end of the head 10 and fed back under the head 10, where it is passed through the opening formed under the bridge 11 to the top surface of the head 10. In this manner, the strap 14 is securely fastened at one end to the head.

Referring to Figure 3 of the drawings, the fastener can be used to fasten objects together by forming the strap 14 into a loop around the articles to be fastened, and inserting its free second end through the passageway 12 in the head 10. The strap 14 is then tightened and secured by folding it back on itself through about 90 over the bridge 12, whereupon the strap tensioning force can be released and any excess length of strap 14 can be cut off. The strap 14 is then permanently secured by folding it completely back on itself before folding the tabs 13 inwardly to constrain the cut end, as shown.

It will be appreciated that the fastener provides an extremely strong fastening around objects. However, such fastenings are difficult and time consuming to secure, particularly if any degree of tension is required in the strap.

Tools are known for tensioning such fastenings. One

such tool engages the inner end of the head 10 and pulls the strap through the passage 12 until the desired tension is reached, whereupon a screwdriver or the like is used to wedge the strap 14 to the head 10 whilst the strap is cut and folded.

Whilst this tool enables the strap to be tensioned, it does nothing to simplify the fastening procedure.

We have now devised a tool which tensions, cuts and fastens a metal banding fastener.

In accordance with this invention, as seen from a first aspect, there is provided a banding tool comprising a body, means on the body for engaging the head of a metal banding fastening, a passageway in the body for receiving the free end of the strap of the fastening projecting from an aperture in the head, a first rotary shaft arranged to drive means in the passageway for pulling the strap through the head aperture to tension the strap, means for temporarily clamping the tensioned strap to the head, a second rotary shaft for activating a blade to cut the strap remote from the head at a point in the passageway, a third rotary shaft for driving a strap folding member towards the head of the fastening to abut the underside of the projecting length of strap, to cause the strap to fold back over the head.

The tool thus enables the fastening member to be tensioned, cut and folded in three simple steps.

In a first embodiment, at least one of the shafts comprises engagement means on one of its ends for receiving a complimentary drive means of a rotary power tool, such as a cordless drill or screwdriver.

In one embodiment of the first embodiment, each shaft may comprise engagement means on one of its ends for receiving said drive means.

Preferably the engagement means of at least two of the shafts are juxtaposed on one end of the tool for engagement by said drive means.

In an alternative embodiment of the first embodiment,

at least two of the shafts are coupled for sequential rotation.

In a second embodiment of the invention, the tool comprises a rotary power source for driving each of the shafts in sequence.

Preferably the shafts are mounted for rotation about parallel axes.

Preferably the tool comprises a slotted rotary bobbin disposed in the passageway for pulling the strap through the head aperture upon rotation of the first shaft.

In use, the projecting length of strap is received in a slot of the bobbin, such that rotation of the bobbin traps the strap and causes it to be wound around the bobbin.

Preferably the blade is elongate and extends perpendicular to the axis of the passageway in the body, the blade being pivotally mounted at one end on one side of the passageway, the other end of the blade being connected to an actuator on the second shaft which moves the blade through its own plane across the passageway.

Preferably the floor of the passageway comprises an edge which extends transverse the passageway below said blade, the blade being arranged to bear against the edge during cutting of the strap.

Preferably the clamping means comprises a wedging member connected to the first or second shafts, so as to temporarily clamp the strap to the head before the strap is completely severed.

Preferably the clamping member is connected to the second shaft, the second shaft being arranged to actuate the wedging member to clamp the strap to the head, whilst the blade cuts the strap.

Preferably the wedging member is slidable under the passageway towards the head, the wedging member comprising an outer end which is urged into the head aperture to clamp the strap temporarily against the head.

Preferably the strap folding member is slidably mounted

for movement in a plane which extends parallel to the plane of the head.

Preferably the folding member is arranged to fold over upstanding tabs on the head following folding of the strap.

Preferably the underside of the folding member comprises a formation having divergent inwardly-facing walls which are arranged to respectively abut the tabs and fold them inwardly.

Also in accordance with the first aspect this invention, there is provided a method of tensioning and securing a metal banding fastening, comprising the steps of providing a banding tool, forming a strap of the fastening into a loop and inserting its free end through an aperture formed in the head of the fastening, feeding the projecting length of strap into a passageway formed in the tool, engaging the head of the fastening with the tool, driving a first rotary shaft to cause means in the passageway to pull the projecting length of strap further through the head to tension the strap, temporarily clamping the tensioned strap to the head, driving a second rotary shaft to cause a blade in the tool to cut the strap in the passageway at a point remote from said head, and driving a third shaft to advance a folding member of the tool towards the head to abut the underside of the projecting length of strap and to fold the latter back over the head.

Preferably the third shaft is further driven to fold upstanding tabs on the head downwardly and towards each other onto the folded strap portion.

Preferably the strap is tensioned by winding it around a bobbin driven by the first shaft.

In accordance with this invention, as seen from a second aspect, there is provided a banding tool comprising means for engaging a substantially flat head of a banding fastener, the tool comprising a passageway extending from said head engaging means at an upwardly inclined angle relative to the plane of the head, and a strap folding member slidably

mounted below the passageway for movement along a path which extends longitudinally of the passageway in a plane which extends substantially parallel to but above the plane of the head.

Thus, as the strap folding member is advanced along the path, it abuts the underside of the strap extending along the passageway and folds it back over the head.

Preferably the passageway comprises an upwardly inclined floor which guides the strap towards strap pulling means during insertion of the strap into the passageway.

Preferably the floor comprises an edge which extends transverse the passageway under the strap, a blade being mounted above the passageway, transverse the longitudinal axis thereof, for movement over said edge.

Preferably the strap folding member comprises means on its underside for folding down upstanding tabs on the head following folding of the strap.

Also, in accordance with this invention, as seen from a third aspect, there is provided a banding tool comprising means for engaging a substantially flat head of a fastening, a slidable folding member arranged for movement towards said head engaging means in a direction which extends substantially parallel to the plane of the head, said head engaging means being arranged to constrain the head against movement in said direction.

A problem of tensioning ties using a tool is that the head of the tie needs to be located correctly in the jaws of the tool, otherwise the tool could jam or an unsatisfactory fastening could be formed. Also, there is a risk that persons could jam or damage the tool by using a conventional type of tie which is not designed for use in a tool.

Thus, in accordance with this invention as seen from a fourth aspect, there is provided a banding tool comprising means for engaging a substantially flat head of a fastening, said head engaging means comprising at least one formation

arranged to engage with a complimentary formation provided on said flat head.

The or each of the formations on the tool engages with the complimentary formation on the head of the tie, thereby ensuring that the tie engages correctly with the tool and preventing the tie from displacing during tensioning. The formations also prevent incorrect ties from being used, particularly if at least one formation on the tool is a projection which extends into a complimentary cut-out on the tie, since it will not be possible to fit a tie to the tool unless it has the appropriate cut-out for receiving the projection on the tool.

Preferably said head engaging means comprises a pair of jaws for clamping onto the head of the tie.

Preferably two projections are formed on at least one of the jaws of the tie.

Preferably, the projection is v-shaped.

An embodiment of this invention will now be described by way of example only and with reference to the accompanying drawings, in which: Figures 1-3 are perspective views showing how a conventional metal banding fastening is assembled and fastened; Figure 4 is perspective view, from the left side and above, of a banding tool in accordance with this invention, with some parts being omitted for clarity; Figure 6 is a perspective view, from the right side and below, of the banding tool of Figure 4, with some parts being omitted for clarity; Figure 7 is a similar view to Figure 6, with some further parts being omitted for clarity; Figure 8 is a perspective view from the left side and above, of the tool of Figure 4, with some parts being omitted for clarity; Figure 9 is a perspective view, from the left side and above, of the tool of Figure 4, with some further parts being

omitted for clarity and with the blade in its raised position; Figure 10 is a similar view to Figure 9, with the blade in its cut position; Figure 11 is a similar view to Figure 9, with some further parts being omitted for clarity; Figure 12 is a rear end view of the tool of Figure 4 ; Figure 13 is a perspective view of the head of a tie for use with banding tool in accordance with the fourth aspect of this invention; and I Figure 14 is a perspective view of the head of an alternative embodiment of tie for use with banding tool in accordance with the fourth aspect of this invention.

Referring to Figures 4 to 11 of the drawings, there is shown a banding tool for operation by a rotary power tool such as a cordless drill or electric screwdriver (not shown).

The banding tool comprises a pair of jaws 20,21 on its underside adjacent the front of the tool for clamping onto the head 10 of a conventional metal banding fastener of the kind shown in Figures 1 to 3. Before the tool is engaged with the head 10, the strap 14 is formed into a loop around the objects to be fastened and the free end of the strap 14 inserted under the bridge 11.

The projecting length of strap 14 is inserted into the tool through an opening formed between the jaws 20,21, where it passes up an inclined rampway 23 towards a slotted bobbin 24 mounted for rotation about an axis which extends parallel tot he axis of the strap 14. The strap 14 extends through one of several slots 25 extending diametrically through the bobbin 24.

Once the strap 14 has been loaded into the tool as described, the strap 14 is pushed further into the tool until the inner edge of the head 10 is received in a slot 26 formed in the inner jaw 20. The outer jaw 21 is then pivoted rearwardly about an axis which extends parallel to the rotational axis of the bobbin 24, by urging a lever 28

forwards, to cause the outer edge of the head 10 of the fastening to be received in a slot 27 formed in the outer jaw 21. In this position, the head 10 of the fastening is securely locked to the tool. In fact, the tool can be released, since it is able to support itself on the fastening.

The fastening is now ready for tightening and in order to achieve this, the user connects a hexagonal-section bit mounted in his drill to a hexagonal socket 28 formed on the end of a first rotary shaft 29 and accessible ! through'a slot 30 formed in the casing 31 of the rear end wall of the tool.

The shaft 29, which extends longitudinally of the tool, is provided with a worm drive 32 engaged with the teeth of a sprocket 33 which is coupled to the bobbin 24. Thus, rotation of the first shaft causes the bobbin 24 to turn, thereby winding the projecting end of the strap 14 around the bobbin.

Once the strap 14 is sufficiently tight, the drill can be disconnected from the shaft 29.

In order to cut the excess length of strap 14 wound around the bobbin 24, the user next engages his drill with a socket 34 formed on the end of a second rotary shaft 35 and accessible through the slot 30 in the rear end wall of the tool. The second shaft 35 extends parallel to the first shaft 29 and is provided with an external screw thread.

The opposite end of the shaft 35 extends into an internally screw-threaded bore formed in a slidable block 36. The block 36 is connected to a plate 37 lying alongside the strap 14 in a plane which extends perpendicular to the plane of the strap. The plate 37 is formed with an elongate slot 38 which is inclined downwardly and forwardly towards the front of the tool.

An elongate cutting blade 39 is mounted across the bottom of the rampway 23 and extends transverse the strap 14. The blade 39 comprises a projection at one end which is received in the slot 38 in the plate 37. The other end of the blade 39 is mounted for rotation about a horizontal axis which

extends parallel to the longitudinal axes of the shafts 29,35 on the opposite side of the rampway 23 to the plate.

The plate 37 is also connected on its underside to one end of a linkage bar 42 which is pivoted, intermediate its opposite ends, to the body of the tool for rotation about a vertical axis which extends perpendicular to the axes of the shafts 29,35. The opposite end of the linkage bar 42 is connected to one end of a wedging member 43 slidably mounted under the rampway 23 for movement in thcl direction of the longitudinal axes of the shafts 29,35. The opposite end of the wedging member 43 comprises upper and lower surfaces which converge into a point.

In use, rotation of the second shaft 35 causes the block 36 to move rearwardly towards the user. As the block 36 moves, the projection on the blade 39 travels down the inclined slot 38 in the plate 37, thereby causing the blade 39 to pivot downwardly. Also, as the block 36 moves rearwardly, the linkage bar 42 urges the wedging member 43 forwardly through an opening in the rear jaw 20 until it becomes wedged between the projecting length of strap 14 and the head 10 of the tie.

The rear vertical face of the blade 39 abuts a hardened steel plate 40 fixed to the bottom of the rampway 23. Thus, as the blade 29 moves downwardly it bears against the hardened plate 40 and cuts the strap 14 transverse its longitudinal axis. The profile of the lower edge of the blade and/or the angle of the slot 38 may be varied to adjust the rate of movement and inversely adjust the cutting force, for example so that a large cutting force is initially provided at the point where the blade 39 first cuts the strap 14.

When the strap 14 is fully cut, the wedging member 43 is fully wedged between the strap 14 and the head 10, thereby maintaining the tension of the looped strap.

Next, the cut end of the strap 14 has to be folded over the bridge 11 of the head 10. This is achieved by the user engaging his drill bit with a socket 44 formed on the end of

a third rotary shaft 45 and accessible through the slot 30 in the rear end wall of the tool. The third shaft 45 extends parallel to the other two shafts 29,35 and is provided with an external screw thread.

The opposite end of the shaft 45 extends into an internally screw-threaded bore formed in an elongate folding bar 46 slidably mounted between the wedging member 43 and the underside of the rampway 23 for movement in the direction of the longitudinal axes of the shafts 29, 35t As the shaft 45 rotates, the folding bar 46 moves forwards through an opening formed in the rear jaw 20 until it abuts the underside of the inclined length of cut strap 14 projecting from under the bridge 11 of the head 10. Continued movement of the bar 46 folds the projecting length of strap 14 back on itself over the bridge 11. As the bar 46 advances, it rides over the folded cut length of strap 14 until it abuts the upstanding tabs 13 on the head 10. The underside of the bar 46 is formed with channels or slots 47 having respective outer side walls which converge away from the front edge of the bar 46. The tabs 13 are received in the respective channels 47 of the advancing bar 46 and are thus brought together as the channels 47 converge, thereby constraining the folded cut end of the strap on the head 10.

Once the fastener has been secured, as herein before described, it can be released from the tool by opening the jaws 20,21. The shafts 29,35 and 45 are then rotated in the opposite direction to return the tool into a state where it is ready for use again.

The tool is straightforward to use, since all that is required is a conventional rotary power tool such as a cordless drill or screwdriver. The three sockets 28,34, 44 are arranged in sequence across the slot 30 and thus the user merely has to move from one socket to the next (e. g. right to left) to perform the correct fastening sequence. In this manner, the user requires a minimal amount of training to operate the tool.

In an alternative embodiment, the tool could be provided with an integral rotary power source, with a mechanism being provided for driving each shaft in the correct sequence.

In a further embodiment, some or all of the shafts, such as the second and third shafts 35,45, could be linked, for example by an idler mechanism. Such that the shafts turn in sequence by driving only one or two shafts. In this manner, the operation of the tool is further simplified.

Referring to Figure 13 of the drawings, there is shown the head of a metal banding tie which is similar to the tie of Figures 1 and 2 and like parts are given like reference numerals. A pair of v-shaped notches 60 are formed in the edge of the head 30 at the outer end thereof on opposite sides of the passageway 12.

In use, the v-shaped notches 60 in the head 30 engage with complimentary v-shaped projections (not shown) on the jaws 20,21 of the tool, thereby ensuring that the tie engages correctly with the tool and preventing the tie from displacing during tensioning. The formations also prevent incorrect ties from being used with the tool.

Referring to Figure 13 of the drawings, in an alternative embodiment, the v-shaped notches 60 can be formed in the edge of the head 30 at the inner end thereof on opposite sides of the passageway 12.

Claims

Claims 1. A banding tool comprising a body, means on the body for engaging the head of a metal banding fastening, a passageway in the body for receiving the free end of the strap of the fastening projecting from an aperture in the head, a first rotary shaft arranged to drive means in the passageway for

pulling the strap through the head aperture to tension the I strap, means for temporarily clamping the'tensioned strap to the head, a second rotary shaft for activating a blade to cut the strap remote from the head at a point in the passageway, a third rotary shaft for driving a strap folding member towards the head of the fastening to abut the underside of the projecting length of strap, to cause the strap to fold back over the head.
2. A banding tool as claimed in claim 1, in which at least one of the shafts comprises engagement means on one of its ends for receiving a complimentary drive means of a rotary power tool.
3. A banding tool as claimed in claim 2, in which each shaft comprises engagement means on one of its ends for receiving said drive means.
4. A banding tool as claimed in claims 2 or 3, in which the engagement means of at least two of the shafts are juxtaposed on one end of the tool for engagement by said drive means.
5. A banding tool as claimed in claims 2 or 3, in which at least two of the shafts are coupled for sequential rotation.
6. A banding tool as claimed in claim 1, in which the tool comprises a rotary power source for driving each of the shafts

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in sequence.
7. A banding tool as claimed in any preceding claim, in which the shafts are mounted for rotation about parallel axes.
8. A banding tool as claimed in any preceding claim, in which the tool comprises a slotted rotary bobbin disposed in the passageway for pulling the strap through the head aperture upon rotation of the first shaft.
9. A banding tool as claimed in any preceding claim, in which the blade is elongate and extends perpendicular to the axis of the passageway in the body, the blade being pivotally mounted at one end on one side of the passageway, the other end of the blade being connected to an actuator on the second shaft which moves the blade through its own plane across the passageway.
10. A banding tool as claimed in claim 9, in which the floor of the passageway comprises an edge which extends transverse the passageway below said blade, the blade being arranged to bear against the edge during cutting of the strap.
11. A banding tool as claimed in any preceding claim, in which the clamping means comprises a wedging member connected to the first or second shafts, so as to temporarily clamp the strap to the head before the strap is completely severed.
12. A banding tool as claimed in claim 11, in which the wedging member is connected to the second shaft, the second shaft being arranged to actuate the wedging member to clamp the strap to the head, whilst the blade cuts the strap.
13. A banding tool as claimed in claims 11 or 12, in which the wedging member is slidable under the passageway towards the

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head, the wedging member comprising an outer end which is urged into the head aperture to clamp the strap temporarily against the head.
14. A banding tool as claimed in any preceding claim, in which the strap folding member is slidably mounted for movement in a plane which extends parallel to the plane of the head.

I
15. A banding tool as claimed in any preceding claim, in which the folding member is arranged to fold over upstanding tabs on the head following folding of the strap.
16. A banding tool as claimed in any preceding claim, in which the underside of the folding member comprises a formation having divergent inwardly-facing walls which are arranged to respectively abut the tabs and fold them inwardly.
17. A banding tool as claimed in any preceding claim, in which the passageway extends from said head engaging means at an upwardly inclined angle relative to the plane of the head, said strap folding member being slidably mounted below the passageway for movement along a path which extends longitudinally of the passageway in a plane which extends substantially parallel to but above the plane of the head.
18. A banding tool as claimed in any preceding claim, in which the strap folding member is arranged for sliding movement towards said head engaging means in a direction which extends substantially parallel to the plane of the head, said head engaging means being arranged to constrain the head against movement in said direction.
19. A banding tool as claimed in any preceding claim, in which said head engaging means comprises at least one formation arranged to engage with a complimentary formation provided on

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said flat head.
20. A banding tool substantially as herein described with reference to Figures 4 to 12 of the accompanying drawings.
21. A method of tensioning and securing a metal banding fastening, comprising the steps of providing a banding tool, forming a strap of the fastening into a loop and inserting its free end through an aperture formed in the head of the fastening, feeding the projecting length of strap into a passageway formed in the tool, engaging the head of the fastening with the tool, driving a first rotary shaft to cause means in the passageway to pull the projecting length of strap further through the head to tension the strap, temporarily clamping the tensioned strap to the head, driving a second rotary shaft to cause a blade in the tool to cut the strap in the passageway at a point remote from said head, and driving a third shaft to advance a folding member of the tool towards the head to abut the underside of the projecting length of strap and to fold the latter back over the head.
22. A method as claimed in claim 18, in which the third shaft is further driven to fold upstanding tabs on the head downwardly and towards each other onto the folded strap portion.
23. A method as claimed in claims 18 or 19, in which the strap is tensioned by winding it around a bobbin driven by the first shaft.
24. A method of tensioning and securing a metal banding fastening, the method being substantially as herein described with reference to Figures 4 to 12 of the accompanying drawings.
25. A banding tool comprising means for engaging a

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substantially flat head of a banding fastener, the tool comprising a passageway extending from said head engaging means at an upwardly inclined angle relative to the plane of the head, and a strap folding member slidably mounted below the passageway for movement along a path which extends longitudinally of the passageway in a plane which extends substantially parallel to but above the plane of the head.
26. A banding tool as claimed in claiih 25, in which the passageway comprises an upwardly inclined floor which guides the strap towards strap pulling means during insertion of the strap into the passageway.
27. A banding tool as claimed in claim 26, in which the floor comprises an edge which extends transverse the passageway under the strap, a blade being mounted above the passageway, transverse the longitudinal axis thereof, for movement over said edge.
28. A banding tool as claimed in any of claims 25 to 27, in which the strap folding member comprises means on its underside for folding down upstanding tabs on the head following folding of the strap.
29. A banding tool as claimed in any of claims 25 to 28, in which the strap folding member is arranged for sliding movement towards said head engaging means in a direction which extends substantially parallel to the plane of the head, said head engaging means being arranged to constrain the head against movement in said direction.
30. A banding tool as claimed in any of claims 25 to 29, in which said head engaging means comprises at least one formation arranged to engage with a complimentary formation provided on said flat head.

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31. A banding tool comprising means for engaging a substantially flat head of a fastening, a slidable folding member arranged for movement towards said head engaging means in a direction which extends substantially parallel to the plane of the head, said head engaging means being arranged to

constrain the head against movement in said direction. i
32. A banding tool as claimed in claims 31, in which said head engaging means comprises at least one formation arranged to engage with a complimentary formation provided on said flat head.
33. A banding tool comprising means for engaging a substantially flat head of a fastening, said head engaging means comprising at least one formation arranged to engage with a complimentary formation provided on said flat head.
34. A banding tool as claimed in claim 33, in which least one formation on the tool is a projection arranged to extend into a complimentary cut-out on the tie.
35. A banding tool as claimed in claim 34, in which the projection is v-shaped.
36. A banding tool as claimed in any of claims 33 to 35, in which said head engaging means comprises a pair of jaws for clamping onto the head of the tie.
37. A banding tool as claimed in claim 36, in which two formations are formed on at least one of the jaws of the tie.