GB1576328A

GB1576328A - Blind riveting

Info

Publication number: GB1576328A
Application number: GB2986076A
Authority: GB
Original assignee: Tucker Fasteners Ltd
Current assignee: Tucker Fasteners Ltd
Priority date: 1976-07-17
Filing date: 1976-07-17
Publication date: 1980-10-08
Also published as: JPS5311382A; ES461463A1; CA1052138A

Description

(54) IMPROVEMENTS IN OR RELATING TO BLIND RIVETING (71) We, TUCKER FASTENERS LIMITED, a British Company of Walsall Road, Birmingham, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following state ment This invention is concerned with improvements in or relating to blind riveting and is especially concerned with tools for use in setting rivets in pull-through blind-riveting.

The expression "pull-through blind riveting" is used herein to denote a procedure in which a shank of a tubular rivet having a head at one end, assembled on a stem of a mandrel which has a head which is too large to pass through the rivet shank without deforming it, is inserted in a hole in a workpiece from one side, in such a manner that the rivet head abuts the workpiece at said one side and the shank projects from the workpiece at the other side, and the rivet is set by pulling the mandrel stem at said one side of the workpiece while holding the head of the rivet against the workpiece whereby the mandrel head effects radial expansion of the rivet shank at the other side of the workpiece and is thereafter pulled right through the rivet.

It is customary in pull-through blind riveting to use a rivet-setting tool which has a nosepiece which serves as an abutment to engage the rivet head and a mandrel with a long stem on which a number, for example twenty-five, rivets are assembled, the rivets being set one after another upon reciprocation of the mandrel and forward feeding of the rivets through the nosepiece and up to the mandrel head. After all the rivets on the mandrel have been set, the mandrel is removed from the tool and the same, or another, mandrel loaded with fresh rivets is inserted in the tool.

To enable the rivets to pass forwardly along the mandrel stem through the nosepiece of a tool as just referred to, the nosepiece is constituted by two abutment members which separate, one on each side of a plane which includes the axis of the mandrel stem, thus allowing each rivet in turn to pass betwen the two members.In some pull-through blind-riveting operations the members of the nosepiece close into abutting engagement with one another after a rivet has passed between them, the shape of the members and of the rivets permitting them so to do; in others, the members do not abut one another but close into engagement with the shank of the next following rivet on the mandrel stem. in some blindriveting operations, sufficient engagement with the rivet head in blind riveting is afforded by nosepiece members which engage only a peripheral margin of the rivet head so far as permitted if the members are surrounding the shank of the next rivet; in others it is important that the members closely surround the mandrel stem (as, for example, when carrying out blind riveting as described in Patent Specification 1,548,880 of patent application No.

30725/75).

It is also desirable that the mandrels of pull-through blind-riveting tools can be rapidly changed when the supply of rivets on a mandrel has run out.

It is one of the various objects of the present invention to provide an improved pull-through blind-riveting tool which permits rapid changing of long-stemmed mandrels on which many rivets are loaded.

A pull-through blind-riveting tool is hereinafter described in detail to illustrate the invention by way of example. The illustrative tool comprises a housing having an elongated barrel arranged to receive a mandrel having a plurality of rivets on it.

Two abutment members of the illustrative tool are pivotally mounted on a front end portion of the barrel for movement between a closed condition and an open condition thereof. Rivets on the mandrel are contained within the barrel but are advanced one-ata-time to a setting position by passing between the abutment members when they are in their open condition to a rivetsetting position outside the barrel. In their closed condition, the abutment members provide an abutment for the head of a rivet at the rivet-setting position during a rivetsetting stroke of the tool.

The illustrative tool also comprises catch means cmoprising a catch, mounted on a common pivot with one of the abutment members, having a finger slideable in a slot in said one of the members so that, when swung against the action of a spring, it can engage the underside of the head of a rivet adjacent to the next to be set rivet and push that rivet and those behind it rearwardly so that the abutment members can assume their closed condition behind the head of the next to be set rivet without interference from the shank of the next rivet.

The illustrative tool also comprises a plurality of gripping jaws mounted in a jaw case for sliding movement along paths inclined at a small angle to the axis of the barrel, a spring-pressed plunger urging the jaws forwardly of the jaw case into gripping engagement with a mandrel stem, and means for moving the jaw case rearwardly of the tool while the jaws are gripping a mandrel. This movement of the jaw case causes a rivet at the rivet-setting position which has its head abutted by the abutment members to be set by having a head of the mandrel pulled through it.

The illustrative tool also comprises a sleeve which extends axially within the barrel of the illustrative tool and surrounds the rivets carried by a mandrel. The sleeve is mounted for axial movement within the barrel and is arranged, on rearward movement, to engage said jaws and cause them to separate as they retract in the jaw case.

This rearward movement of the jaws causes them to separate and release the mandrel. The illustrative tool comprises release means, in the form of a collar slidable on a forward end portion of the barrel of the tool, arranged, upon rearward movement of the collar manually by an operator, to move the sleeve rearwardly to bring about release of the mandrel.

The present invention provides a pullthrough blind-riveting tool comprising an elongated barrel arranged to receive a mandrel having a plurality of rivets on it, abutment members mounted on a front end portion of the barrel for movement between a closed condition in which the members provide an abutment for a rivet head during a rivet-setting stroke of the tool and an open condition in which a rivet can pass between the members, a plurality of gripping jaws mounted in a jaw case and arranged to grip a mandrel received by the barrel, means for moving the jaw case rearwardly of the tool while the jaws are gripping a mandrel so that a rivet on the mandrel which has its head abutted by the abutment members is set by having a head of the mandrel pulled through it, a sleeve extending axially within the barrel and surrounding the rivets carried by a mandrel received by the barrel, the sleeve being mounted for axial movement within the barrel and arranged upon moving rearwardly of the tool to cause the gripping jaws to separate so that they release the mandrel, aid release means arranged, when operated, to move the sleeve rearwardly as aforesaid.

It is preferred that in a tool as set out in the last preceding paragraph the tool also comprises catch means arranged to engage the rivet adjacent to the rivet next to be set and push that rivet rearwardly on the mandrel out of the way of the abutment members.

There now follows a detailed description, to be read with reference to the drawings accompanying the Provisional Specification of the illustrative tool. It will be realised that this illustrative tool has been selected for description by way of example and not of limitation of the invention.

In the drawings accompanying the Provisional Specification: Figure 1 is a view in perspective of the illustrative tool, without a mandrel in it; Figure 2 is a view, with parts broken away and partly in section, of a front end portion of the illustrative tool; Figure 3 is a front end view, with parts broken away, of the illustrative tool; and Figure 4 is a side view, with parts broken away and partly in section, showing gripping means of the illustrative tool.

The illustrative pull-through blindriveting tool comprises a housing 10 which includes a hand grip portion 12, a pneumatic cylinder 14, a hydraulic cylinder 16, an intermediate portion 17, and an elongated barrel 18. The barrel 18 is arranged to receive a mandrel M having a plurality of rivets R on it. The fluid pressure operated means and associated mechanism accommodated in the parts 12, 14, and 16 and 17 is of conventional construction and operation for a pneumatic/hydraulic blindriveting tool, being, for example, as that marketed by the Applicant Company under the designation TT8A.Such part of the illustrative tool will not, therefore, be described further herein except to mention that air under pressure from a flexible hose is admitted to the cylinder 14 below a piston (not shown) through a valve actuated by a trigger 20, and a piston, not shown, in the cylinder 16, and subjected to hydraulic presesure for a pulling stroke of the tool, is secured to a pull rod 22, shown in Figure 4. Release of the trigger 20 reverses the air flow in the cylinder 14, and the pull rod 22 is advanced (i.e. to the left, viewing Figure 4) by a return spring 24.

Upon a forward end portion of the pull rod 22 is screwed a jaw case 28, of conventional construction, with a conical internal wall in engagement with which are part conical ouer surfaces of two jaws 30, 30'.

A jaw pusher 32, urged forwardly into engagement with the mandrel M by a spring 34 in axial recess in the pull rod 22, has itself an axial recess 36 at its front end. A sealing buffer 38 behind a front annular wall 39 of the portion 17 of the housing 10 is arranged to be engaged by the jaw case 28 at the forward end of its stroke. The jaws 30, 30' form gripping jaws arrangec! to grip the mandrel M and the pull rod 22, and the cylinder 14 forms means for moving the jaw case 28 rearwardly of ~ the tool while the jaws are gripping the mandrel M so that a rivet R on the mandrel is set by having a head H of the mandrel M pulled through it.

Screwed on to a front part 26 of reduced diameter of the portion 17 of the housing 10 is the barrel 18 which is long enough to accommodate the pull-through mandrel M with, say, twenty five rivets on it. A rear end portion of the mandrel M is shown in Figure 4, where it is seen gripped by the jaws 30, 30', its rear end portion being inserted in the recess 36 abutting the bottom thereof. (It is the purpose of the recess 36 to enable the jaw pusher to serve as a stop to locate the mandrel correctly lengthwise in the tool when it is initially inserted by the operator).

Turning now to Figures 2 and 3, the barrel 18 of the illustrative tool can be seen to be in two parts, a cylindrical tube 40 screw-threaded externally at its front end, and an internally threaded cap 42 screwed on to the tube and abutting a flange 44 at the front of the tube 40. The cap 42 thus forms a front end portion of the barrel 18. Mounted on the cap 42, on two transverse pivot pins 46, 46' are two abutment members 48, 48'. The pins 46, 46' are parallel and extend widthwise of the tool, which is shown in an upright position in Figure 1. Thus, one of the abutment members, 48, on the pin 46, is uppermost. The abutment members 48, 48' are movable between a closed condition in which they provide an abutment for a rivet head during a rivet-setting stroke of the tool (see Figures 1, 2 and 3), and an open condition in which a rivet can pass between the members 48, 48'.

The two abutment members 48, 48' are arranged to abut the head of a rivet R during a setting-stroke of the tool and are similar in construction (except that the one 48 has a slot, as mentioned hereinafter), each having a forwardly extending, narrowing, configuration terminating in a semiannular end face, which is recessed to accommodate a head H (Figure 2) of the mandrel M at the end of a rivet-setting stroke. Behind the recess in the end face, each member has a neck 50 closely embracing the mandrel stem. Behind the neck 50, each member is hollowed out, with inclined surfaces 51, to accommodate the next rivet R' on the mandrel stem.

Each of the abutment members 48, 48' of the illustrative tool also has an outwardly projecting arm 52 accommodated in an annular recess 54, behind an internal shoulder 56, of a collar 58, slidably received on the cap 42. Rearward movement of the collar 58 by the operator thus results in opening of the members 48, 48'. A flanged sleeve 60 slidably mounted in the cap 42 and in a front portion of the tube 40 bears against the members 48, 48' outwardly of the pins 46, 46', and, being urged forwardly by a compression spring 62 (which runs the length of the barrel and bears on a front face of the portion 17 of the housing 10, see Figure 4) resiliently urges the members 48, 48' into their closed condition.

The illustrative tool also comprises catch means comprising a catch 64 pivotally mounted on the pin 46. The catch 64 has a finger 66 accommodated in a slot 68 in the upper abutment member 48. A torsion spring 70 urges the catch 64 into an out-ofthe-way position, in which it is shown in Figure 2. The catch 64 has an uppermost flange 72 which enables an operator by means of his thumb to rock it downwardly (i.e. anti-clockwise, viewing Figure 2) so that the finger 66 engages the underside of the head of the rivet R' next behind the leading one on the mandrel stem, after the leading one has been advanced, as hereinafter described, between the members 48, 48', so as to push the rivet R', and the column of rivets behind it, back along the mandrel stem, thereby allowing the members 48, 48' to close behind the leading rivet R without interference from the rivet R'.As shown in Figure 3, the finger 66 is offset from the axis of the barrel 18 of the illustrative tool so that, when rocked downwardly, it comes down at one side of the shank of the rivet R'. In Figure 2, the rivet R' is seen already having been pushed back by the catch out of the wav of the neck 50 of the members 48, 48'. The catch 64 is thus arranged to engage the rivet R' adjacent to the rivet R next to be set and to push that rivet R' rearwardly on the mandrel M out of the way of the abutment members 48, 48'. The catch 64 is mounted on the front end portion of the barrel 18 and is pivotal to a position in which the finger 66 of the catch 64 engages the head of the rivet R' and urges it rearwardly.

An an alternative to operating the catch 64 individually by the operator's thumb, the illustrative tool may be modified by extending the recess 54 in the collar 58 rearwardly sufficiently far to permit the operator to move the collar forwardly, from the position shown in Figure 2, and thereby operate the catch.

Turning now to Figures 2 and 4, extending axially within the barrel 18 is a sleeve 80 mounted for limited axial movement within the barrel 18. The sleeve 80 surrounds the rivets carried by the mandrel M which are within the barrel 18.

The sleeve 80 is supported near its front end by the sleeve 60 and at its rear end has a plug. 81 with a hole through it for the mandrel stem, the plug being slidably supported by the annular wall 39 of the portion 17 of the housing 10. Near its front end, Figure 2, the sleeve 80 has an external annular groove to receive a split ring 82 which lies between a face 84 of the sleeve 60 and a stop piece 86 supported on the sleeve 80 in front of the ring 82. The stop piece 86 bears against rear cam surfaces 88 of the abutment members 48, 48'.

The faces 88 are shaped, see the angled face of the member 48' in Figure 2, so that, when the members are rocked on the pins 46, 46' to an open condition just sufficient to allow the passage of rivets therebetween, although the sleeve 60 will be moved back against the influence of the spring 62, the stop piece 86 and consequently the sleeve 80 will not move rearwardly, any tendency to do so being overcome by the spring 34 acting through the jaw pusher 32 and jaws 30, 30'. But if the members 48, 48' are swung more widely open by the operator pulling back the collar 58, to a limit imposed by pins 89 projecting from the flange 44 of the tube 40, the faces 88 acting through the stop piece 86 and ring 82 will move the sleeve 80 rearwardly along the barrel 18.In such event, the plug 81 in the sleeve 80, which projects into the paw case 28 and has a part conical rear end face 90, pushes the jaws 30, 30' rearwardly against the action of the spring 34 and thus releases their grip on the mandrel stem. The sleeve 80 is thus arranged upon moving rearwardly of the tool to cause the gripping jaws 30, 30' to separate so that they release the mandrel M. The collar 58 forms release means arranged, when operated, to move the sleeve 80 rearwardly to release the mandrel M as aforesaid. The collar 58 is also effective to open the abutment members 48, 48'.

By so moving the collar 58 rearwardly, the operator thus both opens the abutment members 48, 48' and releases the mandrel, enabling it to be removed and replaced.

The mandrel (or a fresh one), which is inserted until its rear end portion touches the bottom of the recess 36 in the pusher 32, is gripped by the jaws 30, 30', under the influence of the spring 34, upon release of the collar 58 by the operator.

Advancing means for advancing the rivets along the mandrel stem between rivetsetting operations of the illustrative tool will now be described. The advancing means comprises the pneumatic cylinder 14 which is double acting, air being admitted to the cylinder above the piston on release of the trigger 20. From the top of the cylinder, a pipe 92 (Figure 1) leads to a valve 94, from which a further pipe 96 leads to an inlet port 98 (Figure 4) at one side of the portion 17 of the housing (in front of a seal, not shown, through which the pull rod 22 passes). When the trigger 20 is pressed, an arm 100 on the side of the trigger actuates the valve 94 to exhaust air from above the piston in the cylinder 14 through the pipe 92 to atmosphere.When the trigger is released, the valve directs air under pressure from the cylinder 14 to the port 98 (as well as to the cylinder 14) whence it flows between the jaw case 28 and the portion 17 of the housing 10 and round the mandrel stem into the sleeve 80.

Thus a stream of air is caused to flow through the sleeve and out of the tool at the front of the barrel. This flow takes place between rivet-setting strokes of the tool. The effect of such flow is to move the column of rivets along the mandrel stem forwardly of the tool. The leading rivet is forced between the abutment members 48, 48' which are mounted so that they are caused to open, when a rivet within the barrel 18 moving forwardly of the tool engages the surfaces 51, the spring 62 yielding to allow the members 48, 48' to open.

The flow of air is terminated when the jaw case 28, which starts to move forward when the trigger is released, engages the buffer 38 and thus seals off the gap between the jaw case and the portion 17 of the housing 10.

In using the illustrative tool, the operator loads the tool with a mandrel on which there is a column of rivets. All he has to do to remove an empty mandrel from the tool and insert a fresh one (or the same one with fresh rivets on it) is to retract the collar 58, which both opens the abutment members 48, 48' and releases the grip of the jaws 30, 30' on the mandrel stem, and draw the mandrel out. After inserting the fresh mandrel until he feels the resistance of the pusher 32, he releases the collar, whereupon the sleeve 60, under the influence of the spring 62, closes the members 48, 48' and moves the sleeve 80 forwardly so that the jaws grip the mandrel stem.He will, if necessary, use the catch 64 to clear the rivets from interfering with the closing of the members 48, 48' and, if the leading rivet is not in front of the members 48, 48', he will press and release the trigger 20 to cause the tool to perform an operating cycle to put it there, and depress the catch 64 so that the members 48, 48' can close properly.

The rivets on the mandrel in using the illustrative tool will preferably have heads only slightly smaller than the internal diameter of the sleeve 80, to take full advantage of the short blast of air along the sleeve as the mandrel comes forward after a rivet-setting stroke. But should the rivet heads be so small that insufficient force is generated to push the leading rivet through the abutment members 48, 48', a rivet with a larger head, or a separate plunger, may be placed on the mandrel at the end of the column of rivets.

The length of the mandrel used in the illustrative tool is desirably such that at the end of the rivet-setting stroke its head is fully received in the recessed face of the nosepiece constituted by the members 48, 48'.

With the illustrative tool in its ready-tooperate condition with the leading rivet ahead of the abutment members 48, 48', the operator manipulates the tool to insert the rivet shank in a hole in a workpiece W (Figure 2), and holding the rivet against bodily movement relative to the workpiece by pressing the nosepiece of the tool against the rivet head, he squeezes the trigger 20. The mandrel M executes a rivetsetting stroke in which its head H is pulled right through the rivet and into the recess in the face of the nosepiece. Upon release of the trigger, air is blown forwardly along the sleeve to advance the column of rivets on the mandrel stem and to push the leading one past the abutment members 48, 48' As the mandrel reaches its foremost position, the jaw case 28 engages the buffer 38 and the flow of air along the sleeve 80 ceases.The members will have partially closed under the action of the spring-loaded sleeve 60, on to the shank of the rivet next to the leading one. The operator now flicks the catch 64 with his thumb to push the column of rivets back along the mandrel stem and allow the members 48, 48' to close properly. The illustrative tool is now ready for another rivet-setting operation.

The illustrative tool is reliable and rapid in operation, and replacement of a spent mandrel can readly be effected.

WHAT WE CLAIM IS 1. A pull-through blind riveting tool comprising an elongated barrel arranged to receive a mandrel having a plurality of rivets on it, abutment members mounted on a front end portion of the barrel for movement between a closed condition in which the members provide an abutment for a rivet head during a rivet-setting stroke of the tool and an open condition in which a rivet can pass between the members, a plurality of gripping jaws mounted in a jaw case and arranged to grip a mandrel received by the barrel, means for moving the jaw case rearwardly of the tool while the jaws are gripping a mandrel so that a rivet on the mandrel which has its head abutted by the abutment members is set by having a head of the mandrel pulled through it, a sleeve extending axially within the barrel and surrounding the rivets carried by a mandrel received by the barrel, the sleeve being mounted for axial movement within the barrel and arranged upon moving rearwardly of the tool to cause the gripping jaws to separate so that they realease the mandrel, and release means arranged, when operated, to move the sleeve rearwardly as aforesaid.

2. A pull-through blind-riveting tool according to claim 1 wherein the release means is also effective to open the abutment members.

3. A pull-through blind-riveting tool according to either one of claims 1 and 2 wherein the release means comprises a collar mounted on the barrel and arranged, when moved rearwardly of the tool, to open the abutment members, and the abutment members comprise cam surfaces arranged ro engage the sleeve and move it rearwardly as the abutment members are opened.

4. A pull-through blind-riveting tool according to any one of claims 1, 2 and 3 wherein the tool also comprises catch means arranged to engage the rivet adjacent to the rivet next to be set and to push that rivet rearwardly on the mandrel out of the way of the abutment members.

5. A pull-through blind-riveting tool according to claim 4 wherein the catch means comprises a catch pivotally mounted on the front end portion of the barrel and pivotal to a position in which a finger of the catch engages the head of the rivet adjacent to the rivet next to be set and urges it rearwardly.

6. A pull-through blind-riveting tool according to claim 5 wherein the catch is urged by a spring into an out-of-the way position and can be urged against the spring to bring the finger into engagement with the

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. grip of the jaws 30, 30' on the mandrel stem, and draw the mandrel out. After inserting the fresh mandrel until he feels the resistance of the pusher 32, he releases the collar, whereupon the sleeve 60, under the influence of the spring 62, closes the members 48, 48' and moves the sleeve 80 forwardly so that the jaws grip the mandrel stem. He will, if necessary, use the catch 64 to clear the rivets from interfering with the closing of the members 48, 48' and, if the leading rivet is not in front of the members 48, 48', he will press and release the trigger 20 to cause the tool to perform an operating cycle to put it there, and depress the catch 64 so that the members 48, 48' can close properly. The rivets on the mandrel in using the illustrative tool will preferably have heads only slightly smaller than the internal diameter of the sleeve 80, to take full advantage of the short blast of air along the sleeve as the mandrel comes forward after a rivet-setting stroke. But should the rivet heads be so small that insufficient force is generated to push the leading rivet through the abutment members 48, 48', a rivet with a larger head, or a separate plunger, may be placed on the mandrel at the end of the column of rivets. The length of the mandrel used in the illustrative tool is desirably such that at the end of the rivet-setting stroke its head is fully received in the recessed face of the nosepiece constituted by the members 48, 48'. With the illustrative tool in its ready-tooperate condition with the leading rivet ahead of the abutment members 48, 48', the operator manipulates the tool to insert the rivet shank in a hole in a workpiece W (Figure 2), and holding the rivet against bodily movement relative to the workpiece by pressing the nosepiece of the tool against the rivet head, he squeezes the trigger 20. The mandrel M executes a rivetsetting stroke in which its head H is pulled right through the rivet and into the recess in the face of the nosepiece. Upon release of the trigger, air is blown forwardly along the sleeve to advance the column of rivets on the mandrel stem and to push the leading one past the abutment members 48, 48' As the mandrel reaches its foremost position, the jaw case 28 engages the buffer 38 and the flow of air along the sleeve 80 ceases.The members will have partially closed under the action of the spring-loaded sleeve 60, on to the shank of the rivet next to the leading one. The operator now flicks the catch 64 with his thumb to push the column of rivets back along the mandrel stem and allow the members 48, 48' to close properly. The illustrative tool is now ready for another rivet-setting operation. The illustrative tool is reliable and rapid in operation, and replacement of a spent mandrel can readly be effected. WHAT WE CLAIM IS

1. A pull-through blind riveting tool comprising an elongated barrel arranged to receive a mandrel having a plurality of rivets on it, abutment members mounted on a front end portion of the barrel for movement between a closed condition in which the members provide an abutment for a rivet head during a rivet-setting stroke of the tool and an open condition in which a rivet can pass between the members, a plurality of gripping jaws mounted in a jaw case and arranged to grip a mandrel received by the barrel, means for moving the jaw case rearwardly of the tool while the jaws are gripping a mandrel so that a rivet on the mandrel which has its head abutted by the abutment members is set by having a head of the mandrel pulled through it, a sleeve extending axially within the barrel and surrounding the rivets carried by a mandrel received by the barrel, the sleeve being mounted for axial movement within the barrel and arranged upon moving rearwardly of the tool to cause the gripping jaws to separate so that they realease the mandrel, and release means arranged, when operated, to move the sleeve rearwardly as aforesaid.

head of the rivet as aforesaid.

7. A pull-through blind-riveting tool according to either of claims 5 and 6 wherein the finger of the catch is accommodated in a slot in one of the abutment members.

8. A pull-through blind-riveting tool according to any one of claims 1, 2, 3, 4, 5, 6 and 7 wherein the tool comprises advancing means arranged to cause a stream of air to flow forwardly through the sleeve between rivet-setting strokes of the tool so that rivets within the barrel are moved forwardly of the tool.

9. A pull-through blind-riveting tool according to any one of claims 1, 2, 3, 4, 5, 6, 7 and 8 wherein the abutment members are mounted so that, when a rivet within the barrel moving forwardly of the tool engages the members, the members are caused to open.

10. A pull-through blind-riveting tool according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8 and 9 wherein the jaws are urged into engagement with the mandrel by a spring-pressed jaw pusher which has a recess therein into which a rear end portion of a mandrel can be inserted to locate the mandrel in the tool.

11. A pull-through blind-riveting tool constructed and arranged substantially as hereinbefore described with reference to the drawings accompanying the Provisional Specification.