AU742745B2 - Fastener fixing apparatus - Google Patents

Description

AUSTRALIA

Patents Act COMPLETE SPECIFICATION

(ORIGINAL)

Class Int. Class Application Number: Lodged: Complete Specification Lodged: Accepted: Published: Priority Related Art: 0..

0.0..

0 0 0 0 0 0 0 Name of Applicant: Societe de Prospection et D'lnventions Techniques SPIT Actual Inventor(s): Patrick Herelier, Frederic Nayrac, Alain Vettoretti Address for Service: PHILLIPS ORMONDE FITZPATRICK Patent and Trade Mark Attorneys 367 Collins Street Melbourne 3000 AUSTRALIA Invention Title: FASTENER FIXING APPARATUS Our Ref: 634365 POF Code: 1431/78734 The following statement is a full description of this invention, including the best method of performing it known to applicant(s): 1A FASTENER FIXING APPARATUS The present application is a divisional application from Australian patent application number 63025/99 the entire disclosure of which is incorporated herein by reference.

The invention generally concerns an apparatus for fixing fasteners and in particular apparatus for fixing fasteners by means of combustion of an inflammable compressed gas. The apparatus is applicable in the building industry for the fixing of cables, ducts and other accessories of this type.

This type of fixing apparatus comprises a cylinder, into which is slide mounted a fastener propelling piston, a combustion chamber, a housing to receive a compressed gas cartridge, a removable magazine for the supply of fasteners, a fastener-guide, a shearing unit and a handle.

The fastener supply magazine, removable, contains a strip of fastener-holding S rings. The shearing unit comprises a passage to accept fasteners which connects with the fastener magazine and extends forwards via a fastener guide 20 passage of the fastener-guide, for the purpose of guiding the fastener until it penetrates the support.

At time of firing, the fastener at the head of the support strip is inserted into the shearing unit and, after the apparatus is pressed against a support, the piston is oleo• 25 propelled forwards and strikes the fastener which has been accepted into the shearing unit. As a result of the strike, the strip of fastener-holding rings is :**sheared, the fastener at the head of the strip, detached, is projected forwards, guided by the fastener-guide, and penetrates the support.

In known fastener fixing apparatus the fastener supply magazine and the shearing unit are locked together by means of a locking system with a knob, in order to prevent their separation during apparatus firing. The locking operation using such a system tends to be tedious and prone to incorrect or incomplete W.X~naVNBV0DEETE~pecf =ns~isinaIof 63025-9g.doc 2 locking of the magazine in position. As a result, the fasteners may not feed correctly to the shearing unit and the apparatus may malfunction.

The present invention aims to address, at least partially, this inconvenience of the prior art.

To this end, the invention concerns fastener fixing apparatus comprising a magazine fastener for supplying fasteners, designed to contain a strip of fasteners, a fastener-guide, a unit for shearing the strip of fasteners, and means for snap fit removable mounting of the magazine to the apparatus.

With the fastener fixing apparatus of the invention, the magazine can be quickly and easily locked in position particularly in relation to the shearing unit. The positive locking action of the magazine achieved by the present invention means that correct and complete locking is much more likely, leading to more reliable operation.

*o*Preferably, the means for achieving the snap fit comprise a shoulder, supported by a spindle mounted on return mechanisms intended to act in conjunction with e* a cut-out to receive the shoulder, extended by at least one finger to thrust onto, and lock the shoulder in place.

Preferably, the spindle carrying the shoulder is mounted on a housing of the apparatus, whilst the cut-out and at least one finger are provided on the 25 magazine.

*.In one preferred embodiment, means are provided to prevent inadvertent movement of the spindle which moves the shoulder out of the cut-out thereby locking the shoulder into the cut-out.

It is to be understood that, throughout the specification and claims, the word "comprise" and variations of the word, such as "comprising" and "comprises", is not intended to exclude other additives, components, integers or steps.

W~v~naVNB NDELTESecilcatonsD~sinaIof 63025-99.doc 3 The invention will be better understood with the aid of the following description of a particular embodiment of the fixing apparatus of the invention, with reference to the appended drawing in which: 0 figure 1 represents a view in partial perspective of the fixing apparatus without fastener magazine; 0 figure 2 represents a perspective of the fastener magazine for the apparatus in figure 1; figure 3 shows a perspective of a snap fit system for fixing and locking the fastener magazine of figure 2 onto the apparatus of figure 1, just prior to fixing; 0 figure 4 shows a cross sectional view of the snap fit system of figure 3, along the line IV-IV; 0 figure 5 shows a cross sectional view of the snap fit system of figure 3 after fixing and before locking, along the line IV-IV; o figure 6 shows a cross sectional view of the snap fit system of figure 3 after fixing and before locking, along line VI-VI; a figure 7 shows a cross sectional view of the snap fit system of figure 3 after locking, along the line IV-IV; S. figure 8 shows a cross sectional view of the snap fit system of figure 3 20 after unlocking, along the line IV-IV.

ooooi It should be noted now that "the front" and "the rear" indicate the direction towards which the fastener is propelled at time of firing and the opposite direction respectively.

The fastener fixing apparatus comprises a casing 1 with integral handle 5 and a housing 6 to receive a compressed gas cartridge, a removable magazine 2 for supplying fasteners, designed to contain a strip of fastener-holding rings, a fastener-guide 3, a unit 4 for shearing the strip of fastener-holding rings and an anti-firing safety system.

The casing 1 encloses a cylinder, in which is slide mounted a fastenerpropelling piston, a combustion chamber and a battery housing, not shown.

3025-99.doc 4 The anti-firing safety system prevents any firing without first pressing the apparatus against a support.

The fastener-guide 3 and the shearing unit 4 extend forwards of the casing 1, along a longitudinal axis 7. The handle 5 extends approximately at right angles to the axis 7, here parallel to the housing 6 of the compressed gas cartridge and to the rear thereof. The handle 5 and the housing 6 extend below the casing 1, in an axial (that is containing the axis 7) median plane of the apparatus, which will subsequently be termed "plane P".

The shearing unit 4 consists of two parts, lower 9 and upper 10, in each of which is formed a cut-out of semicircular cross-section and firmly fastened to each other by means of screws 8, It is stressed here that, since the two parts, lower 9 and upper 10, are firmly fixed to each other, the shearing unit 4 is functionally a single unit. A shearing unit formed from a single part could equally well have been envisaged.

The two cut-cuts of the lower 9.and upper 10 parts of the shearing unit 4 form a fastener reception passage extending forwards via a fastener guide passage S 20 going through the fastener-guide 3 and intended to guide the fastener when fired, until it penetrates a receiver material.

The upper part 10 of the shearing unit 4 has integral with it at its forward end a fastener-guide carrier 13 into which is slide mounted the fastener-guide 3. The fastener-guide 3, mounted in this way so that it slides in relation to the shearing unit 4, here functions as a probe to check for pressing against a support and closure of the combustion chamber.

The lower part 9 of the shearing unit 4 is integral with an external projecting skirt 11 forming a through passage 12 bringing the fasteners into the shearing unit 4, which communicates with the latter's fastener reception passage.

The back section of the shearing unit 4 is received and screwed into a reception cradle 14, integral with the front part of the casing 1.

WAnaMNBNODELETEvSpedficnssion2I of 63025-9.doc The fastener magazine 2 encloses a housing for a strip of fastener-holding rings, with an upper opening 15, and a system for impelling the strip of fasteners towards the upper opening 15. The housing for the strip of fasteners connects via the upper opening 15 with a compartment 16 for the skirt 11 of the shearing unit 4. The magazine 2 extends along a longitudinal axis 19.

Subsequently the median plane of the magazine 2 containing the axis 19 will be termed "plane P The shearing unit 4 and the fastener magazine 2 are designed to work in conjunction by housing the skirt 11 in its reception compartment 16, the skirt 11 and its reception compartment 16 being modelled so that the one fits into the other loosely.

The fastener magazine 2 has a rear face 17, made to appear opposite a front face 18 of the housing 6. The face 17 carries at its lower end a female snap fit i part 40 intended to act in conjunction with a male snap fit part 20 integral with the lower end of the face 18, to achieve the fixing of the fastener magazine 2 onto the apparatus.

2 The male snap fit part 20 comprises a spindle 21 supported by two flanges 24, 25 and itself supporting two shoulders 26a, 26b, in the form of collars.

The two flanges 24, 25 extend overall parallel to the plane P of the apparatus, on either side of the latter, and the spindle 21 is at right angles to this plane P.

The two flanges 24, 25 are extended backwards by two fixing lugs 22a, 22b respectively, integral-with the housing 6 and resting against each other.

The flange 25 comprises a housing 27 to receive an end part 21a of the spindle 21, projecting towards the inside of the male part 20. A spring 28 has one end pressing against the bottom of the housing 27, and the other end against the bottom of an axial cavity 29 formed in the end part 21a. The spindle 21 is thus spring mounted and has axial translatory motion.

W:\AWaMNB\NODELETESpecaorntsMsionaJ of 63025-99.doc 6 The flange 24 comprises a housing 30 to receive the shoulder 26b, projecting towards the inside of the male part 20. A transverse opening 31, for the passage of the end Part 21b of the spindle 21 opposite the end part 21a, is formed in the base of the housing 30. The spindle 21 thus projects laterally from the flange 24 outwards. The end part 21 b is threaded and accepted into a tapped hole 33 formed in a knob 32 for moving the spindle 21, and has two flats intended to work in conjunction with two twin flats of the opening 31, in order to block the rotation of the spindle 21. A stop 34, intended to prevent axial translatory movement of the knob 32, is fixed onto the external lateral surface of the flange 24 and has an opening through it for the passage of the spindle 21.

Translatory motion of the spindle 21 is limited, on the one hand by stopping the shoulder 26a against the edge of the housing 27 and, on the other hand, by stopping the shoulder 26b against the edge of the opening 31, at the base of the housing "i Housings 27 and 30 are separated from each other by a space 36 to receive the female snap fit part 40, as will be explained later.

S 20 The two fixing lugs 22a, 22b, form a free surface 31, extending in the area and to the rear of the spindle 21 in a plane which is overall at right angles to the axis 7. The two flanges 24, 25 form between them a lower passage 35 for insertion of the female snap fit part 40 extending upwards via a passage 35' (figure 6) to receive a plate 46 for positioning the female snap fit part 40, formed between the surface 31 and the walls of housings 27 and :i In resting position. (figures 3 and the shoulder 26a is positioned in the receiving space 36, at right angles to the insertion passage 35. The shoulder 26b extends to the bottom of its housing 30 and the knob 32, unscrewed, is separated from the stop 34.

The female snap fit part 40 has a cut-out 41 to receive the shoulder 26a, extending in the plane continued upwards by two symmetrical fingers, rear 42 and front 43, to push and lock the shoulder 26a, as will be explained later.

W:\PAnnra\MNBNODELETE\.Specifwa nsD\D sionof 63025.9.doc 7 The front finger 43 is adjacent to the surface 17 and the rear finger 42 is separate from it, towards the rear.

Fingers 42 and 43 draw in towards each other from their respective ends which connect with the cut-out 41, towards their free ends, separated from each other by a distance slightly greater than the diameter of the spindle 21. The cut-out 41 has an inner wall to receive the shoulder 26a, of semicircular shape in longitudinal section in the plane oriented towards the upper part of the magazine 2. The inner walls of the fingers 42, 43 extend the inner wall of the cut-out 41, the overall inner wall being circular in shape in longitudinal section (parallel to the plane of diameter substantially greater than that of the shoulder 26a, with an opening for the passage of the spindle 21. The fingers 42, 43 are thus intended to lock the shoulder 26a into its receiving cut-out 41.

Each finger 42 (43) has a straight external lateral face 44a, parallel to the plane and another external lateral face 44b inclined in relation to the plane the "i width of the finger 42 (43) narrowing from the end connecting with the cut-out 41 towards its free end. The inclined faces 44b, thus modelled as wedges, function as pressure surfaces intended to repel the shoulder 26a laterally when .e the male snap fit part 20 is inserted into the female snap fit part 40, as will be explained later.

The section of the lateral opening 47 of the female snap fit part 40 in the plane of the straight lateral face 44a is narrowed, smaller than the cross section of the shoulder 26a but slightly larger than the cross section of the spindle 21.

The rear finger 42 supports the positioning plate 46 extending at right angles to the plane P' and parallel to the longitudinal axis 19.

A fixing arm is integral with the female snap fit part 40, and extends downwards in the longitudinal plane opposite the fingers 42, 43. The fixing arm 45 is received into a slot formed in a projection 48 integral with the lower end part of the surface 17 and screwed to this projection 48.

W:nnaXMNB\NODELETESpedficatbsDMsiona of 635-99.doc 8 The width of the cut-out 41, at right angles to the longitudinal plane is perceptibly less than the distance separating the two housings 27 and 30, in other words than the width of the space 36, and slightly greater than the width of the shoulder 26a.

The operation of mounting the fastener magazine 2 onto the fixing apparatus will now be described.

Firstly an operator indexes the fastener magazine 2 in relation to the fixing apparatus by positioning the skirt 11 in front of its reception compartment 16 and the female snap fit part 40 in the lower insertion passage 35 of the male snap fit part The operator then pushes the magazine 2 upwards (that is, towards the axis 7).

The skirt 11 then fits into its reception compartment 16 and the female snap fit part 40 penetrates into the male snap fit part SWhen the female snap fit part 40 is introduced into the male snap fit part 20, the positioning plate 46 is accepted and locked into its reception space 32. In addition, the thrust surfaces 44b of the thrust fingers 42,43 laterally repel the shoulder 26a, against the return action of the spring 28, until the reception cutout 41 is virtually in line with the shoulder 26a. The latter then penetrates the reception cut-out 21 under the pressure action of the spring 28, and is stopped against the inner edge of the narrowed lateral opening 47. In this position, the fingers 42, 43 lock and retain the shoulder 26a in the reception cut-out 41.

:i The operator then screws the knob 32 to move it along the spindle 21 until it presses against the stop 34, The knob 32 is thus blocked from axial translatory motion, which prevents the operator from moving the spindle 21. The shoulder 26a is thus locked into the reception cut-out 41, which ensures that the fastener magazine 2 is locked in a functioning position onto the fixing apparatus.

Once the fastener magazine 2 has been fixed, the fastener at the head of the strip is inserted into the fastener reception passage of the shearing unit 4, via W:\nn3NB NODELETE\Specicratons\Dsiona of 63025.9.doc 9 the input passage 12, through the thrust action of the thrust system of the magazine 2. In order to fix a fastener into a support, the operator presses the apparatus against that support. When pressing the apparatus against the support, the operator advances the casing 1, integral with the shearing unit 4 and with the fastener-guide carrier 13, in relation to the fastener-guide 3, the free end of which is pressed against the support. Pressing against the support causes the closure of the combustion chamber, into which compressed gas is injected, and causes the anti-firing safety system to be unlocked. Then the operator triggers the firing in order to make the compressed gas contained in the combustion chamber explode. The piston is then propelled forwards and strikes the fastener taken into the reception passage of the shearing unit 4. The striking action causes the shearing of the ring strip and the fastener, now detached, is projected forwards and guided by the guide passage of the fastener-guide until it penetrates the support.

To remove the fastener magazine 2, the operator separates the knob 32 from the stop 34 by unscrewing, then pushes it towards the stop 34 against the return action of the spring 38 moving the spindle 21 axially until the shoulder 26a is stopped against the edge of the housing 27. In this position (figure 8), the shoulder 26a is no longer held in the reception cut-out 21 by the fingers 42, 43, and the operator separates the male 20 and female 40 snap fit parts by pulling the fastener magazine 2 downwards.

When the magazine has been removed, the fixing apparatus can be used to fix a fastener pre-mounted onto a part to be fixed, or to fix a fastener into a deep section.

For safety purposes, a shutter may be provided to close up the fastener input passage of the skirt of the shearing unit after removal of the fastener magazine.

W:xAnn\MNBxNODELETE\Speificatins\Dinaof 63025-99.doc

Claims (11)

1. Fastener fixing apparatus comprising a magazine for supplying fasteners, designed to contain a strip of fasteners, a fastener-guide, a unit for shearing the strip of fasteners, and means for snap fit removable mounting of the magazine to the apparatus.

2. Apparatus in accordance with claim 1, wherein the means for snap fit mounting of the magazine comprise a shoulder, carried by a spindle mounted on return mechanisms, intended to work in conjunction with a cut-out for reception of the shoulder, extended by at least one finger to thrust against and lock the shoulder in place.

3. Apparatus in accordance with claim 2, wherein the spindle carrying the shoulder is mounted on a housing of the apparatus.

4. Apparatus in accordance with claim 2 or 3, wherein the cut-out and at least one finger are provided on the magazine.

5. Apparatus in accordance with any preceding claim, wherein means are provided to prevent inadvertent movement of the spindle out of the cut-out thereby locking the shoulder into the cut-out. OO..

6. Apparatus in accordance with any preceding claim, wherein the shearing unit comprises a lower part and an upper part secured together so that the shearing unit is functionally a single unit.

7. Apparatus in accordance with any preceding claim, wherein the said shearing unit and the magazine for supplying fasteners, are designed to work in conjunction with each other by housing a skirt, forming a fastener input passage, in a reception compartment for the skirt.

8. Apparatus in accordance with claim 7, wherein the skirt and its reception compartment are shaped so that the one fits into the other loosely. W:\Anna\MNB\DELETE\Spedficabns\DMsionI of 63025-99.doc 11

9. Apparatus in accordance with any preceding claim, wherein the skirt is integral with the shearing unit.

10. Apparatus in accordance with any preceding claim, wherein a cradle is provided to receive a back end part of the shearing unit.

11. Apparatus in accordance with any preceding claim, wherein the fastener- guide is mounted to slide in relation to the shearing unit. DATED: 4 January 2001 PHILLIPS ORMONDE FITZPATRICK Attorneys for: SOCIETE DE PROSPECTION ET D'INVENTIONS TECHNIQUES SPIT 0 S Oboe.: **0 a 6 W:%Anna\MN8ODELETEfSpediaonsD sion2I of 63025.9.doc