EP0069710B1

EP0069710B1 - Portable rivetting machine

Info

Publication number: EP0069710B1
Application number: EP82830191A
Authority: EP
Inventors: Giovanni Falcone
Original assignee: Landis and Gyr SpA
Current assignee: Landis and Gyr SpA
Priority date: 1981-07-02
Filing date: 1982-06-28
Publication date: 1987-05-06
Also published as: DE3207962C2; IT8153404V0; EP0069710A2; ATE26940T1; EP0069710A3; IT8153404U1; DE3207962A1

Abstract

A portable rivetting machine of the type including a channel (20) for slidingly receiving a series of interconnected rivet elements (rivets, U-shaped staples and the like), a resiliently-loaded slidable pusher for pushing the series of elements towards a discharge end. The channel (20) is internally provided with more than one pair of longitudinal dividing walls (38, 40) extending up from its base wall so as to define pairs of interstices (50, 52) disposed symmetrically with respect to the centre line of the channel as well as a central interstice (54) extending along the centre line of the channel. Each pair of two interstices (50, 52) is arranged to receive the legs of a respective series of U-shaped staples (E1, E2) of a width corresponding to the distance between the interstices themselves. The central interstice (52) is arranged to receive a series of rivets (E3). The pusher (56) includes the same number of parallel blades (60, 66, 68) as the number of interstices with each blade being housed in an interstice itself. The blades are interconnected by a yoke (62, 68) above the upper edges of the dividing walls of the channel (20).

Description

The present invention relates to a portable rivetting machine of the type indicated in the preamble of Claim 1.
US-A-3.156.920 discloses a magazine construction for a portable rivetting machine in which the channel of the magazine is provided with one pair of longitudinal dividing walls which extend from its base wall such as to define a pair of symmetrically disposed interstices adapted to receive the legs of U-shaped staples of a predetermined width and a central interstice adapted to receive a series of rivets.
A rivetting machine provided with a magazine of the aforesaid known type shows a certain degree of versatility because it is able to receive both U-shaped staples of different height, that is with legs of different lengths, and rivets or nails of different lengths. However, this known magazine is able to receive only staples of the same width.
The magazine according to US-A-3.156.920 is provided with a pusher which comprises three parallel blades, with each blade being housed in an interstice. The blades are interconnected by a yoke which simply rests on the upper edges of the channel. This arrangement is affected by tilting of the pusher. Especially when long staples or rivets are used and when the series of staples or rivets is almost exhausted, an even slight inclination of the pusher has the effect of exerting on the last element of the series a thrust which is not parallel to the direction of movement, with the consequence of jamming of the staples or rivets in the slit at the discharge end of the magazine.
The object of the present invention is to provide a more versatile rivetting machine which not only is able to receive, selectively, series of rivets of different lengths and series of staples of different widths and of different lengths, but is also more reliable than the known rivetting machines in that it is not liable to jamming even in the case of very long rivets or staples.
According to the present invention this object is achieved by means of a riveting machine having the features set forth in the characterizing clause of claim 1.
A stapling machine according to the invention is able to receive, in addition to rivets, also U-shaped staples of two different widths and of many different lengths.
The guide means which prevent the pusher from inclining ensure that the thrust is always exerted by the pusher in a direction parallel to that of movement of the staples or rivets, thus preventing possible jamming.
The characteristics of the invention will be better understood from a reading of the detailed description which follows, made with reference to the appended drawings, given by -way of nonlimiting example and in which:

Figure 1 is a side elevational view of the rivetting machine,
Figure 2 is an exploded perspective view of the channel and of the parts associated therewith,
Figure 3 is a side elevational view, to an enlarged scale with respect to Figure 1, showing only the lower unit of the rivetting machine, defining the channel,
Figure 4 is a view of the unit of Figure 3 from above,
Figure 5 is a cross-sectional view, to an enlarged scale, taken on line V-V of Figure 4,
Figures 6 to 8 are cross-sections of the channel, which illustrate the manner in which various rivetting elements are guided, and
Figure 9 is a partial section, to an enlarged scale, taken on line IX-IX of Figure 3.

Referring to Figure 1, a rivetting machine comprises, in known manner, a body 10 with a base part 12, a part 14 acting as a handgrip and a head 16. In the head 16 is housed, in known manner, an electromagnet which can be selectively energised by means of a trigger 18 to cause a blade punch for discharging staples from the machine, to descend.
Under the base part 12 is fixed a sheet-metal channel 20 which accommodates a series of rivet elements. As will be seen below, these elements are urged towards the end of the channel 20 underlying the head 16 where the blade punch discharges them one by one through a slit defined by a pair of mating plates 22 and 24 of which more will be said below.
A slidable foot 26 is connected to the channel 20 for supporting the rivetting machine on the working surface P.
Referring to Figures 2 to 5, the channel 20 includes an outer sheet-metal element 28 of substantially U-shaped profile, with side walls 30 and a base wall 32. Within the outer element 28 there is located a further U-shaped, sheet-metal element 34 which has a base wall 36 applied to the wall 32, and two side walls 38.
Within the inner U-shaped element 34 are located two parallel sheet-metal strips 40 provided with tabs 42 along their edges facing the bottom of the channel. The tabs 42 are inserted in respective slits 44 in the internal element 34 and slits 46 in the outer element 28 and are upset to secure all the elements 28, 34 and 40 together in the configuration illustrated in Figures 5 to 8.
As illustrated in Figures 5 to 8, the walls 38 and strips 40 define respective pairs of longitudinal dividing walls which extend up from the base wall of the channel and which define a pair of outermost interstices 50 (between the walls 30 and the walls 38), a pair of innermost interstices 52 (between the dividing walls 38 and 40), as well as a central space 54 (between the dividing walls 40). The dividing walls 38 are higher than the dividing walls 40.
A pusher 56 is slidable in the channel 20 and comprises an outer sheet-metal element 58 in the form of an upturned U with a pair of sides 60 and an upper yoke 62.
An internal sheet-metal element 64 is located within the outer element 58 and has an upturned U profile with a pair of side walls 66 and an upper yoke 67.
Within the internal U-shaped element 64 is located a plate element 68 which has tabs 70 on its upper edge. The tabs are inserted in respective slits 72 in the internal U-shaped element 64 and slits 74 in the outer U-shaped element 58, and are upset to secure the three elements 62, 64, 68 together in the configuration illustrated in Figure 5.
As may be seen in Figure 5, the walls 60,66 and 68 define respective blades each of which is housed in one of the interstices of the channel 20. As will be understood below, these blades serve to engage the rear end of the respective series of rivet elements and push them towards the discharge end of the channel 20.
Projecting from the upper yoke 62 of the outer U-shaped element 58 is a pair of lugs 76 through which a longitudinal guide rod 78 can slide. A hook member 80 of shaped sheet-metal is fixed to the rear end of the rod 78 and can be hooked, in known manner, to the entry end of the channel 20. A helical spring 82 is interposed between the pusher 56 and the hook member 80 for the purpose of resiliently urging a series of staples along the channel 20 by means of the blades of the pusher 56.
An appendage 84 in the form of a plaque bearing a reference mark 86 is mounted on the rod 78 between the lugs 76. The plaque 84 projects through a slot between the channel 20 and the base part 12 of the body 10 and is movable along a scale 88 (Figure 1) to indicate the position of the pusher 58 in the channel 20 and hence the quantity of rivet elements contained in the channel itself.
The side walls 30 of the channel have respective longitudinal ribs 90 which define corresponding internal grooves 92. In these grooves 92 are guided corresponding longitudinal ribs 94 of the pusher 56. This coupling has the object of preventing the pusher 56 from inclining with respect to its direction of sliding, since inclination of the pusher could cause the rivet elements to jam, especially the last element to be discharged.
The foot 26 is constituted by a substantially U-shaped sheet-metal element. In the upper part of its side wall, it has respective stepped wings 96 which embrace the ribs 90. Tabs 97 are formed in the wings 96 by semi-punching and engage the upper parts of the ribs 90. In this manner, the foot 26 is mounted for sliding movement along the channel 20.
The foot 26 has a front projecting part 98 which, when the foot is in its fully advanced position, is disposed beneath the plates 22, 24 and closes off the discharge slit to provide a safety barrier in periods when the rivetting machine is not in use. The foot 26 can be fixed in this advanced position by means of a side screw 99 (Figure 5) which can be screwed into one of the side walls of the channel 20 through a corresponding hole in the foot 26, one of the ends of which, moreover, is arranged to be in front of the pusher 56 to prevent its advancement.
Referring to Figure 6, a first type of rivetting element is shown as E, and is constituted by a relatively wide, short staple. The transverse or yoke part of the element E, rests on the upper edges of the outermost pair of dividing walls 38 and the legs of the element E, are located in the outermost interstices 50 and slidingly embrace the dividing walls 38.
The pusher 20 (Figure 5) pushes the series of elements E₁ by means of its outermost blades or sides 60.
In Figure 7 is shown a second type of rivet element E₂ which is relatively narrow and long. The points or lower ends of the legs of the element E₂ rest on the base wall of the channel or rather on the base wall 36 of the innermost U-shaped element, and these legs are guided in the interstices 52 between the two pairs of dividing walls 38 and 40.
The pusher 56 (Figure 5) pushes the series of elements E₂ by means of its pair of blades 66.
In Figure 8 is shown a further rivet element E₃ constituted by a rivet. The point of the rivet rests on the base wall 36 and is guided within the central interstice 54 by means of the two dividing walls 40.
The pusher (Figure 5) pushes the series of rivets by means of its middle blade 68.
Referring now to Figure 9, as well as to Figures 2 and 4, the discharge slit at the end of the channel 20 through which the blade punch of the rivetting machine expels the rivet elements one by one, is indicated by 100. The slit 100 is defined between two mating plates, a front plate 22 and a rear plate 24. The front plate 22 is formed with a wide groove 102 of a width such as to guide the rivet element E₁ as well as the blade punch (not shown). The front plate 22 is also formed with a narrow central guide groove 104 for the rivet element or rivet E₃.
The rear plate 24 is formed with a groove 106 of intermediate width which serves as a guide for the rivet element E₂.

Claims

1. Portable rivetting machine of the type comprising a channel (20), defined by a base wall and a pair of side walls, for slidingly receiving a series of interconnected rivet elements (rivets, U-shaped staples and the like), a resiliently-loaded slidable pusher (56) for pushing the series of elements towards a discharge end of the channel where there is a slit (100) for the discharge of the elements from the bottom of the channel (20), and a blade punch reciprocably movable through the slit (100) to detach the elements one by one from the series and discharge them through the slit (100), the channel (20) being internally provided with longitudinal dividing walls (38, 40) extending up from its base wall such as to define interstices (50, 52) disposed symmetrically with respect to the centre line of the channel as well as a central interstice (54) extending along the centre line of the channel, the symmetrically disposed interstices being arranged to receive the legs of a series of U-shaped staples of a width corresponding to the distance between the interstices themselves and the central interstice (52) being arranged to receive a series of rivets, and the pusher (56) comprising the same number of parallel blades (60, 66, 68) as the number of interstices with each blade being housed in an interstice, the blades being interconnected by a yoke (62, 68) above the upper edges of the dividing walls of the channel, characterised in that it includes two pairs of dividing walls (38, 40) for defining one pair of outermost interstices (50) and one pair of innermost interstices (52) for the sliding of two series of different U-shaped staples (E_i, E₂), in that the pusher (56) includes a pair of sides (60) engaged with the internal faces of the walls (30) of the channel (20) and in that the side walls and sides are provided with mutually interengaging guide means (92, 94) which serve to prevent the pusher (56) from inclining with respect to its direction of sliding, said guide means being constituted by longitudinal grooves (92) in the side walls (30) of the channel (20) and corresponding longitudinal ribs (94) in the sides (60) of the pusher (56).

2. Rivetting machine according to Claim 1, characterised in that of the two pairs of dividing walls the outermost (38) have a greater height and the innermost (40) a lesser height with respect to the bottom of the channel, the outermost dividing walls being arranged to be slidingly embraced by a series of U-shaped staples (E₁) of greater width and of lesser length, these staples being supported, by means of their yokes, on the upper edges of the outermost dividing walls, and the innermost dividing walls (40) being arranged to be slidingly embraced by a series of U-shaped staples (E₂) of lesser width and greater length, these staples being supported, by means of the tips of their legs, on the base wall of the channel, and the innermost dividing walls (40) being arranged to embrace with sliding coupling a series of rivets (E₃), these rivets being supported by means of their tips on the base wall of channel.

3. Rivetting machine according to claim 1 or 2, characterised in that the channel (20) includes two sheet-metal elements (28, 34) with substantially U-shaped profiles, inserted one in the other to define the walls (30) of the channel and the outermost dividing walls (38) as well as the base wall, and two sheet-metal strips (40) which define the innermost dividing walls, these strips being provided with tabs (42) which pass through respective slits (44,48) formed in the base wall of the channel and which are upset to secure the strips and the profiled elements together.

4. Rivetting machine according to claim 1 or 2, characterised in that the pusher (56) includes two sheet-metal elements (58, 64) with substantially U-shaped profiles, inserted one in the other to define outermost blades or sides (60) of the pusher as well as a pair of intermediate blades (66) and a central blade (68) which has tabs (70) which pass through respective slits (72, 74) formed in the yokes of the U-shaped elements and are upset to secure the central blade and the U-shaped elements together.

5. Rivetting machine according to any one of the preceding claims, characterised in that the discharge slit (100) is defined by a pair of mating plates (22, 24) respectively a front one and a rear one with respect to the slit itself, the mating faces of these plates being formed with grooves (102, 104, 106) for guiding the blade punch and the various rivet elements (E₁, E₂, E₃) during the discharge movement.

6. Rivetting machine according to any one of claims 1 to 4, characterised in that the pusher (56) is provided with an appendage (84) which projects transversely of the channel (20) and which like the movement of a curser, moves in front of a scale (88) to indicate the quantity of rivet elements contained in the channel (20).