DE1515360A1 - Pressing tool for pressing electrical connection terminals - Google Patents

Description

Dr. phil. G. B. HAGEN 1 C 1

Patent attorney '-> \

MUNICH 71 (Solln)

Franz-Hals-Strasse 21

Telephone 796213

AMP 511 Munich, October 4, 1968

Dr.H./K./HM

File number P 15 15 360.3
AMP Incorporated

description

Press tool for pressing electrical connec- ^

clamps

The invention relates to a pressing tool for pressing electrical connecting terminals between a fixed and one with respect to this one movable in only one direction, in which the movable one Die part is driven by hydraulic drive means via a knee joint, which consists of two levers, which are connected to one another, rotatable against one another, and of which one lever is at its rotatable connection point remote end rotatable with the die carrying the movable die part and the other Lever is connected at its end facing away from the swivel joint with a fixed point, so that a straight direction this knee joint causes a straight forward movement of the punch.

Such tools are known in principle z. B. by the DBP 942 554. The invention aims to improve such tools. In particular, it should be achieved that the force exerted on the die of the press during the

,,, 909831/0506

Bayerische Vereintbank Munich 820993

AMP 511 - 2 -

Working stroke increases and about the end of the stroke assumes its maximum value.

A pressing tool of the type mentioned is characterized according to the invention in that, as per se known in connection with pressing tools, a movable cam driven by hydraulic means is provided, which acts on a toggle bolt connecting the two toggle levers and on one pivotable rotating part is attached, which forces a movement of the cam on a curved path, t and in that the cam has a first pressure surface which is substantially transverse to the direction of movement of the movable joint part and acts on the knee joint pin when the cam is in its retracted state and during the first part of its movement, as well as a second Pressure surface which extends essentially parallel to the direction of movement of the movable die part and pushes on the toggle pin when the cam is in the advanced position and during the remaining part of the movement in order to push the knee levers into their straight position.

> With the tool according to the invention it can be achieved that the path covered by the movable die part during the first movement phase is several times as high is greater than the path covered by the cam. In the actual pressing operation, i. H. in the last movement phase, on the other hand, this relationship can be reversed, i.e. that is, the path covered by the die part is shorter than that covered by the cam and that the force exerted by the die part is a multiple of that of the Force exerted on the cam.

900831/0506

IJJUU

Refinements of the invention are characterized in the attached claims.

An embodiment of the invention is described below in connection with a pressing of electrical connecting terminals discussed at the end of a cable serving hand tool. From the figures show:

Figure 1 is a perspective view of the tool;

Figure 2 is a sectional view of the cylinder part of the tool shown in Figure 1, wherein the Parts of the tool shown in their relevant position for the start of the work cycle are;

Figure 3 and Figure 4 of Figure 2 similar representations, but the moving parts of the Tool are shown in an intermediate state and at the end of the work process;

FIG. 5 shows a section along the section line V-V of FIG. 3;

Figure 6 is a perspective view of the block of the tool containing the cam;

FIG. 7 shows a sectional illustration corresponding to the section line VII-VII in FIG. 5;

FIG. 8 shows a sectional view corresponding to the section line VIII-VIII in FIG. 7;

FIG. 9 shows a graphic representation in which, in dependence time the displacement of two parts of the tool during the work cycle

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is shown.

Daa in Figure 1 shown tool for pressing electrical Verbindunsklemmen to an electric cable comprising a cylindrical part 2, the flutes 2 has ^1, so that the tool can be gripped by hand better. The cylindrical part 2 is closed at one end by the head piece 4 , through which the end of a punch 6 extends. The end of the cylinder part, which is closed by the head piece 4, will hereinafter be referred to as the front end and the "opposite end" as the rear end. On the part 4 ears 8 are provided, to which a substantially C-shaped head part 10 is attached , on which is arranged the holder 11 of the fixed die part 16. Movable die parts 12 for pressing the clamps, which cooperate with the fixed die part 16, are attached to the holder part 14, which is arranged at the front end of the punch 6. For greater clarity ness are the die members not shown in the figures 2 and 4 12th

A piston 18 is arranged axially displaceably in the rear part of the cylinder 2 and a supply line 20 supplies pressure fluid to the rear end of the cylinder 2 so that the piston is moved forward in the working stroke. On the outside of the tool, a lever 22 is provided on the cylinder 2, which is used to control a valve which supplies the liquid to the cylinder 2 and removes it therefrom. The piston 18 is biased rearward by a compression spring 25 acting against the front surface of the piston and against a fixed plate 24; the plate 24 divides the inner space of the cylinder 2 into a front part in which the lever linkage

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amp 511 - 5 -

is arranged to increase the force, and in a rear part in which the piston 18 is displaceable. A piston rod 26 is articulated at one end of the piston 18 and the other end is mounted in a slot 27 of a block 28 so that at 29 the lever can be pivoted into position on the block. The rear end of the block 28 protrudes in the position of the parts of the tool shown in FIG. On the cover part 4 is a generally U-förmigeB housing 30 'directly disposed with a similar central portion, as can be seen Figure 5, the curvature of the wall is adapted to the cavity of the cylinder 2; two side surfaces 32 extend radially and parallel to each other into the interior of the cylinder 2. Pigur 5 reveals that the block 28 is oriented in the housing part 30 'so that its central part 34 lies between the side surfaces 32 and a toilet 36 of the block which runs perpendicular to the parts 34, with its end surfaces lying coplanar with the wall surfaces 32 extending outwardly. The Elock 28 is attached to the housing 30 'by two parallel links 38, each of which links at one. The end at 42 is pivotally attached to the end face of the part 36 (while the other end is articulated at 40 to one of the walls 32.

At the rear end © of the punch 6 there is an intermediate piece 43 screwed on, which allows the length of the punch to be adjusted and the rear end by means of a pin on the two front connecting links 46 of a toggle linkage is pivotally attached, the toggle linkage having two rear connecting pieces 48,

AMP 511 - 6 -

which are connected at 52 to the links 46 and form a knee joint. The pin 44 penetrates the rear end of the intermediate piece 43 and the walls 32 of the housing 30, as can be seen in FIG. 7 and FIG. The rear ends of the links 48 of the toggle linkage are connected to the rear pins 40 so that the rear links 38 of the block 28 and the rear links 48 of the toggle linkage have a common hinge axis. The joint 52 of the toggle linkage has a roller 54 which engages the block 28. The hinge 52 is normally biased into the position shown in FIG. 2 by the springs 56 on both sides of the walls 32. The springs 56 are held by bolts 58 which are provided between the plate 24 and the cover piece 4 of the cylinder. The front ends of the springs 56 are connected by means of bolts 60 to the outwardly extending parts of the pin 44, said ends of the pin 44 being inserted into the. Walls 32 protrude. The arrangement allows the ram 6 to be advanced from the position shown in Figure 2, the toggle linkage being stretched so that the links 46 and 48 are stretched; the springs 56 normally bias the plunger 6 and the connecting links 46 and 48 into the position shown in FIG. 2, ie in which the toggle linkage is buckled. A leaf spring 64 is arranged in the housing 30 'in such a way that it is horizontally bent with its front end 62 outward, whereby the mouth parts 46 and 48 are pressed out of their fully extended position according to FIG. The adjustment lever 61 provided in the housing 30 'limits the movement of the joint 52 beyond the position in which the connecting links 46 and 48 are fully extended.

ΙΟΗίί / ΘΙββ

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The block 28 has a rearwardly and radially outwardly inclined surface 66 and a cam surface 68, these both surfaces cooperate with the roller 54. When the block 28 and the piston 18 are in their far retracted Position according to Figure 2 are located, 30 the roller 54 acts against the surface 66. With a forward movement of the Block 28 and the piston 18, the roller 54 and the joint 52 move and the surface 66 acts against the roller 54, so that the connecting members 46 and 48 assume the position shown in FIG. When the forward movement of the Piston 18 and the block 28 continues to advance, the roller 54 acts against the cam surface 68, so that the Toggle linkage continues to approach the stretched position, the punch 6 moving further. The cam surface 68 is curved so that a compensation of the phenomenon is effected that the block 28 is not a straight but a, describes curved path during the working cycle of the tool.

The end of a spring biased pawl 70 in slot 27 extends beyond block 28 and engages in a groove 74 in a rod 75 when the position shown in FIG. 2 is given. The Stajige 75 is arranged between the rear surface of the lid part 4 and the front surface of the plate 24 so that a displacement in the radial direction inwards and outwards in cylinder 2 is possible, but a shift in axial seal is not possible. A toothing 72 on part of the rod 75 between the groove 74 and a wide groove 76 acts in the forward movement of the block 28 together with the claw 70 and prevents backward movement of the parts until the claw falls into the upper groove 76 , followed by a backward movement of the

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Block 28 is possible. As shown in FIGS. 5 and 7 is, the rod 75 is provided in a groove of a part 78 which is movable with respect to the rod 75 and is attached to block 28. As a result, the rod 75 is movable together with the block 28.

If the plunger 6 initially moves forward during a small part of the stroke of the piston 18, this will be the case Joint 54 in Figures 2 and 4 moved to the rightB. the The initial movement of the piston 18 causes the punch 6 to perform a much greater movement than the piston, what through the mechanical beneficial effect of the knee lift Igestänges results, which causes the coupling of the block 28 with the punch 6. When the roll 54 acts against the cam surface 68, the roller is controlled in its initial direction of movement with solohem pressure, that sufficient thrust is exerted on the punch 6, as is necessary for the pressing process. In figure 9 shows the displacement of the piston 18 and the ram 6 as a function of time; the punch 6 moves at a much greater rate of advance in the initial part of the movement of the piston 18, during it covers the remaining part of its movement stroke at a significantly lower speed than the piston, the speed of the piston being substantially constant during the stroke. The work done at the movement of the piston is available, is therefore essentially consumed for the pressing process and is not used for advancing the punch 6, which practically unloads the greater part of the stroke moves and travels the considerable distance provided in the die to easily make a connector clamp to be able to insert between the geat parts.

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The rearward sloping surface 66 ensures an initially rapid movement of the punch with respect to the piston. The speed of the ram during its initial movement with respect to the piston can vary Adjustment of the angle of the surface 66 can be changed. The leaf spring 64 causes that at the end of the pressing stroke of the punch 6, the toggle linkage is automatically buckled again, so that the punch duroh the springs 60 will be withdrawn.

The pivoting arrangement of the block 28 has less Friction losses on the Nookenflache result than if a cam feet on the piston would be provided in order to perform a simple linear sliding movement and the knee joint to move the linkage.

Claims ι

Claims (6)

AMP Incorporated claims 1. Pressing tool for pressing electrical connecting clamps between a stationary die part and a die part that is movable in only one direction, in which the movable die part is driven by hydraulic drive means via a knee joint consisting of two levers that are connected to one another, rotatable against one another Bind and of which one lever is rotatably connected at its end facing away from the rotatable connection point to the punch carrying the movable die part and the other lever is connected to a fixed point at its end facing away from the swivel joint, so that a straight direction of this knee joint means a straight forward movement Stamp, characterized in that, as known from sioh in connection with pressing tools, a hydraulically driven, movable cam (68) is provided which acts on and acts on a toggle bolt (52) connecting the two toggle levers (46, 48) one so swiveling en rotating part (38) is attached, which forces a movement öes ÜQQktnß on a curved path, and in that the cam has a first pressure surface (66) which extends substantially transversely to the direction of movement of the movable die part (12) and on the Kniegölenkbolaen (52 3 © works when the squat is in its retracted state (Figure 1) and during the first part of the movement of the same, as well as a second I / TUGkfläohe, which extends to the west parallel to the direction of movement of the movable hinged part (12) and AMP 511 -Jt- presses on the toggle lever pin (52) when the cam is in the advanced position (Figure 4), as well as during the remainder of the movement in order to move the toggle levers into their straight position to press. 2. Tool according to claim 1, characterized in that the cam is pivotable on. a piston rod (26) is mounted, which is pivotably arranged on a moving by a pressure fluid piston (18), au transmitted for the purpose of a compressive force on the * punch (6). 3. Tool according to claim 1 or 2, characterized in that spring means (56) the two levers (4-6, 48) of the knee joint bent into the Press position. 4. Tool according to one of claims 1 to 3, characterized in that »that the Cam (68) is arranged on a block (28) that a claw (70) is provided on the block, which with a rack (72) cooperates and ensures that the cam (68) a forward movement of the ram (6) for a correct path length causes, for the purpose that the workpiece is compressed before the punch (6) is withdrawn will. 5. Tool according to claim 4, characterized in that the rack (72) on a rod (75) attached to the block (28) is attached, and that the block (28) is displaced in the longitudinal direction of the rod (75) during the movement of the block (28) will. 901831/0506 AMP 511 - <■? - 6. Tool according to claim 1 or one of the following, characterized in that the tool is designed as a hand tool and the cam (68) and the toggle lever (4-6, 48) in a cylinder part (2) are arranged, which forms the handle of the tool. 909831 / 3S0S -AS- Blank page