DE1254940B - Device for pressing in prefabricated nuts that punch their own receiving hole - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Int. Cl .:

B 21 j

GERMAN

PATENT OFFICE

EDITORIAL

German class: 49 g-16/03

Number: 1254 940

File number: M61700Ib / 49g

Filing date: January 16, 1960

Opening day: November 23, 1967

The invention relates to a device for pressing prefabricated, its receiving hole in a plate-shaped workpiece self-punching nuts, with a nut feed head, one vertical running nut receiving channel with a vertically movably guided press ram, a nut feed channel opening laterally below the ram into the receiving channel and a nut locking device arranged in the receiving channel below the feed channel, which consists of levers pivotable about horizontal axes, at the lower ends of which there are locking stops are attached, which protrude into the receiving channel, under the pressure of the ram however dodge and release the mother in the process.

In known devices of this type (U.S. Patents 1503 861 and 2230518) the pivotable, one-armed lever held in the nut-locked position by leaf springs or rubber rings and when the downwardly moved ram hits the mother through the side edges of the Swiveled nut against the spring forces in the nut release position. With a well-known Hand riveting machine (Swiss patent 56 353) for riveting leather parts and the like two double-armed pivot levers on the lower part of the ram pivotable about a horizontal axis stored. The pivot levers are pressed by a spring into a position in which the locking stops reach under the ram head and allow a rivet to be inserted. When lowering the Press ram hit the laterally protruding upper arms of the pivot lever on pins that a Pivoting the lever and a movement of the locking stops outwards into the release position cause.

The elastic return means of the pivot levers provided in the known devices are subject to very frequent alternating bending stresses and a hard, jerky operation, especially at high working speeds. Fatigue and cracking are the result. Such a susceptibility to failure is very disadvantageous in particular in the case of automatically operating machines. In the case of a spring-controlled return, the pivot position of the levers is not only dependent on the current position of the ram, but also on the machine speed. This affects the safe functioning, especially at higher press ram speeds. In addition, the swivel levers can be used in the device for pressing in prefabricated,
their receiving hole self-punching nuts

Applicant:

Multifastener Corporation,

Redford, me. (V. St. A.)

Representative:

Dr.-Ing. H. Negendank, patent attorney,

Hamburg 36, Neuer Wall 41

Named as inventor:

Jerry H. Steward, Bloomfield Hills, Mich.

(V. St. A.)

follow from acting against the spring forces, for example caused by vibrations of the machine Inertial forces or the like. Swivel outwards so that the mother falls down prematurely.

The invention aims to achieve the object of creating a device that is reliable Locking of the nuts ensures and signs of fatigue in the pivot lever return devices turns off.

According to the invention, a device of the type mentioned in the introduction is thereby achieved in order to achieve the object further developed that each of the double-armed pivot levers at its upper end one for Receiving channel has directed nose, and that in the side surfaces facing the noses of the Press ram actuating and the pivot lever releasing cam tracks are provided.

In the device according to the invention, the pivot levers inevitably remain in their for as long Nut locked position until the ram moves the nut. Only then can the upper noses of the Swivel the swivel lever into the releasing cam tracks of the press ram. On the upstroke of the stamp, the noses are also inevitably outwards and the locking stops of the Swivel lever pressed inwards into the nut blocking system. As a result, there is a strict dependency on the Lock lever position ensured by the position of the ram. The spring-free solution will continue eliminates the risk of a spring break. This advantage is particularly significant when if the locking device is in the receiving channel itself

709 689/113

3 4

is arranged and in the event of a spring break therefore each 26 and in the press head 16 can be moved up and down.

sometimes a time-consuming and cumbersome implementation. For further guidance, an engages on the tappet 56

Anderbau the Muttera feed head required sliding block 54 arranged in a longitudinal groove 52 of the

were. Because of these advantages, the guide post according to the invention is 20. By means of a spring 64, the

Device, preferably for installation in automatic plunger 56, always pressed down. It serves to

table-working machines with a high working height - which are in front of the stop shoulder 29 in the foreground

speeds suitable. guide channel 103 lying nut M ' when the slide

An embodiment of the invention is now pulled away from under it, down onto the

described more on the basis of the drawings. It shows the height of the front section 27 of the feed channel

F i g. 1 to press a section through the essential parts io 103 and to hold there until the schieder Nut setting device, this nut in one position of the one 152 when it moves again individual parts shortly before a press-in process, to the vertical receiving channel 132

Fig. 2 is a section along the line II-II in promotes. Meanwhile, the plunger56 also acts as a

F i g. 1, on an enlarged scale, bolt for the next following nuts.

F i g. 3 shows a view in the direction of the arrow III-III in FIG. 2 and 3 are below the coin

F i g. 2 to the parts shown there and manure of the front feed channel section 25 to both

F i g. 4 is a perspective view of a finished side of the vertical receiving channel 132

provided workpiece with pressed-in insert nut pivot lever 140 on horizontal pins 142

ter, with part of the workpiece being cut away pivotably and lying on a cam track

ten is. 20 144 at the lower end of the stamp 126. At the bottom

In FIG. 1, the reciprocating press end is the pivot lever 140 with a locking upper part designated by 12. On it is provided under clashes 145, on which a mother M circuit circuit of an intermediate plate 68 of the press can rest with its side flanges. On theirs head 16 attached, on which a ram 122 with the respective locking stop 145 opposite one another tapered ram section 126 by means of the pivot arm have the pivot lever Aneiner Screw 124 is screwed tight. In a knockout lugs 149, which in the case of the downward recess 30 of the press head is a middle moving of the press ram 126 caused out-guide stand 20 of the opposite to the press head pivot the locking stops 145 in releasing 16 reciprocating nut feed head cam tracks 151 of the ram engage. 18 guided and by means of a in a guide slot 30 when moving the ram up again 32 of the guide post 20 engaging pin 34 the pivot lever by their impact on the secured against rotation. upward moving actuating cam tracks 144

The feed head 18 consists of the middle guide of the ram 126 pivoted back again,
support stand 20, a front screwed to it- The mode of operation of the device is as follows-

ren head piece 26, which is used to press the panel 35 Dimensions:

shaped workpiece P is used on the die 9, and with a downward movement of the upper part of the press

From a feed rail 102 for the insert nut 12, the feed head 18 first strikes with its

tern M, on which a slide piece 148 slidably attached- head piece 26 on which is placed on the die 9

is arranged. Workpiece P and clamps this through the force

The feed head piece 26 has a vertical 40 of the spring 88 fixedly. When the press head nut receiving channel 132 moves further, in which the press head 16 approaches the feed head 18, the pel 126 runs and the spring 88 is more strongly tensioned below the uppermost point and the squinting of the press ram 126 through the feed overlap 148 is withdrawn to the rear by the nut feed channel 103 formed by the downwardly moving cam rail 102 on the coin surface 40. The det. This feed channel 103 consists of a front 45 insert nut M which, during the previous section 27, and a rear section pushed onto it via a work sequence by the slide 152 into the counter sunk section 29 in the direction of the punch movement on the right-hand nut receiving channel 132, is offset 104. Until then, the wall of the pivot lever 140 rests on the locking stops 145 opposite the stop shoulder 29. As the rear section 104 continues downward, a slide 152 seated on 50 moving the press head 16 hits the press ram with slide piece 148. 126 onto the insert nut M , pushes it through. This slide is through a vertical receiving channel 132 at the press head 16 down and fixed cam piece 38 with an inclined cam presses it into the workpiece. Meanwhile, surface 40 pulls back over a cam follower roller 146- the slide 152 retreats further so that it is movable and is released by a compression spring supported on the rear part 55 path for the next nut M ' down 108 of the feed rail 102. This nut M 'is then advanced again by the tappet 119. At this rear part 108 56 pressed downward, the plunger 56 at the same time as the feed rail being changed to the feed line 110 leading from an outer magazine preventing the next following nut from advancing. When the press head was moved up again, closed. 60 is the slide 152 by the spring 119 again

The feed head 18 is moved forward by an on the press and pushes the nut M 'in the front

senobteil 12 supporting spring 88 cushioned. This feed channel section 27 forward to the plant

Spring 88 presses in the guide post 20 on one of the wall of the upwardly moving press

Bolt 82, which ram feeds 126 with a shoulder 84 in a bore. With a further upward movement of the

100 of the feed rail 102 engages and the feed 65 press head 16 lifts the cam surface 40 off

thus fixed the rail. the follower roller 146 off, and the slide remains in its

In the area in front of the stop shoulder 29 is parallel position until the ram 126 is above the

for punch 126, a plunger 56 is located in the feed head piece, the mouth of the feed channel, and the other

Claims (1)

Way for mother M 'is free. The force of the spring 119 then pushes the slide 152 forward and pushes the nut M ' into the vertical receiving channel 132 above the locking stops 145 of the pivot lever 140. There the nut is held by the locking stops 145 until the ram 126 is next Workflow moved down again. When the punch 126 hits the rivet nut, it presses against the stops 145 via its flanges and rotates the pivot levers 140 about the pins 142. When this process begins, the upper lugs 149 move inwardly into the releasing cam tracks 151 and the rivet nut is released . When the ram 126 is moved up again, the lugs 149 of the pivot levers 140 are inevitably pivoted back again by the cam tracks 144 of the press ram and the lower locking stops 145 are prevented from swiveling out in an undesired manner. 30th Claim: Device for pressing prefabricated, their receiving hole in a plate-shaped workpiece self-punching nuts, with a nut feed head that has a vertically extending nut receiving channel with a vertically movable plunger guided therein, a nut feed channel below the ram laterally into the receiving channel and has a nut locking device arranged in the receiving channel below the feed channel, which consists of levers pivotable about horizontal axes, at the lower ends of which locking stops are attached, which protrude into the receiving channel, but evade under the pressure of the ram and thereby release the nut, characterized that each of the two-armed pivot levers (140) has at its upper end a nose (149) directed towards the receiving channel (132) , and that actuating (144) and pivoting levers (140) in the side surfaces of the press ram (126) facing the noses ) release nde (151) cam tracks are provided. Considered publications:
Swiss Patent No. 56 353;
French Patent No. 1,099,458;
U.S. Patents Nos. 2,593,506, 2230518,
861 1 sheet of drawings 709 689/113 11.67 Θ Bundesdruckerei Berlin