DE2203880A1 - Reversing switch for reversing the direction of rotation of an electric motor - Google Patents

Description

Dr. phil. G. B. HAGEN

MUNICH 71 (Solln)
Franz-Hals-Strasse 21
Telephone 796213

LU 3012 Munich, January 25, 1972

NS

Lucerne Products, Inc. 76OO Akron Cleveland Road Northfield, Ohio, V ₀ St. A.

Reversing switch for reversing the direction of rotation of an electric motor

Priority; Jan. 28, 199715 V.St.A .; No. ₀ 110 515

The invention relates to a compact electrical switch for a power tool or device or another device driven by an electric motor and in particular a compact reversing switch to reverse the direction of rotation of an electric motor.

US Pat. No. 3,467,8OI describes a reversing switch in which a contact element of the reversing switch, on which a plurality of contact tips are provided, is linearly displaceable with respect to the base body of the switch, so that the contact element moves into a plurality of operating positions is, wherein the contact tips of the contact element with a plurality of the fixed contacts of the base form contact in a predetermined manner and thus bridge a plurality of the switch contacts conductively, whereby the direction of the current flow through the switch can be reversed according to the position of the contact element with respect to the fixed contacts; included

Bayerische Vereinebank Munich 820 9S3

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an operating handle is provided on the switch housing, which interacts with the displaceable contact element and the contact element in one or the other
moves its operating positions. One such switch
is relatively bulky and a relatively complicated mechanism is required to move the contact element
to move linearly with respect to the switch body.

The invention provides a new, very compact reversing switch mechanism which is suitable for use in the same fields of application as the switch described in US Pat should be achieved.
A rotatable switch segment is provided for the rotary movement of contact elements with respect to stationary ones
Contacts of the switch so that a reversal of the electrical energy supplied to the motor is achieved o

It is an object of the invention to provide a novel reversing switch for an electric motor. A further object of the invention is to create a mechanism driven by an electric motor, for example a power tool or device, which has an actuating trigger and a reversing mechanism having a reversing switch o The reversing switch should be compact and economically constructed with a minimum of parts, and it should be able to be produced by mass production »In addition, a compactly designed rotatable reversing switch should be created, which in
a portable electrically powered tool or device or other mechanism driven by an electric motor and which allows rapid reversal of the drive motor of the tool or mechanism

209632/0141

A further object of the invention is to provide a novel compact reversing switch that has a having a relatively stationary contact holding segment and a rotatable contact holding segment, with a plurality of electrical Contacts on the stationary segment and a plurality of electrical bridge contacts on the rotatable Segment are provided and wherein the rotatable segment can be selectively moved into a plurality of effective positions can and in one of these positions the associated electric motor in one direction and in another position of the rotatable segment is driven in the opposite direction,

In a switch according to the invention, the contacts are here of the stationary segment arranged on corresponding sections of the stationary holding segment of the switch, wherein each stationary contact has a contact area which is substantially the same as the contact areas of the other stationary contacts lies in a common plane so that the bridge contacts of the rotatable segment are in sliding contact with get these contact surfaces and so a reversal of the Direction of rotation of the drive motor is reached.

An embodiment of the invention is described below under Described with reference to the figures. From the figures .show:

Figure 1 is a partially broken away side partial plan view of the handle of a portable electric tool with a reversing switch according to the invention, the tool parts dash-dotted lines and the trigger and switch assembly according to the invention in solid lines Lines are shown;

FIG. 2 is a side plan view of the trigger and switch assembly from the other side of FIG Figure 1;

FIG. 3 is an enlarged partial plan view from above of the trigger and switch assembly of FIG 2 with the lever for operating the rotary segment of the reversing switch removed;

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Figure k

Figure 5
Figure 6
Figure 7

Figure 8

Figure 9

Figure 10

Figure 11 Figure 12

Figure 13 Figure Ik

Figure 15 Figure l6

a partial plan view of the rear end of the switch arrangement along the line kk of Figure 6 in the direction of the arrow;

an exploded plan view of the reversing switch of the arrangement of Figures 1 and 2;

a section along the line 6-6 of Figure 3 in the direction of the arrow;

a plan view along a plane of the line 7-7 of Figure 5 in the direction of the arrow, wherein the Orientation of the contact surfaces of the stationary contacts of the stationary segment of the Switch, which are in a common plane, is illustrated as well as the gripper means, maintaining the feed lines in contact with one of the stationary contacts;

a plan view from below along the line 8-8 of Figure 5 in the direction of the arrows, with the undersides the upper sectors of the stationary holding segment of the reversing switch are shown;

a top plan view along the line 9-9 of Figure 5 in the direction of the arrows, the upper Side of the lower sector of the stationary holding segment of the reversing switch is shown;

an enlarged plan view from below along the line 10-10 of Figure 6 in the direction of the arrow, wherein the means for releasably holding the rotatable holding segment in a selected position are shown;

a perspective view of one of the stationary electrical contacts of the reversing switch;

a side plan view of one of the sliding electrical contacts of the rotary segment of the switch;

a top plan view of the contact of Figure 12;

an interrupted plan view from above of the lever, which is used to actuate the wire retaining segment of the switch is used;

a section along the line 15-15 from Figure Ik \

a section along the line I6-I6 of Figure 14;

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FIG. 17 shows an enlarged diagrammatic representation of a position of the rotatable holding segment of the switch, the electric motor being actuated in one direction of rotation in this position} the actuating lever for the switch is shown in the form of a single dash-dotted line}

FIG. 18 shows a representation similar to FIG. 17, but with the rotatable holding segment shown is after it has been moved or rotated to another position so that a reversal of the direction of rotation of the motor is achieved will;

Figure 19 is a bottom plan view of the rotatable Holding segment;

Figure 20 is a section along line 20-20 of Figure 19;

FIG. 21, on a reduced scale, is a diagrammatic top view of a handle for a force- driven tool with a modified device for rotating the reversing switch ; and

FIG. 22 is a plan view of the arrangement of FIG.

Figure 1 illustrates a power tool in which the invention can be used. The tool can be portable, with a downwardly extending pistol-like handle 10 being provided on which a trigger switch assembly 12 is arranged which controls the operation of an electric motor (not shown), for example a universal electric motor, of the tool. The trigger 13 is under the bias of a spring and is therefore movable to and fro and cooperates with a speed control switch Ik to control the speed of the electric motor in a manner known from the prior art. The switch assembly 12 also has a locking mechanism with a reciprocating pin 17, whereby the trigger 13 in its full

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dig depressed or maximum "on" position locked will.

The speed control switch 14 is well known and is used to vary the speed of an electric motor in response to the inward movement of the trigger from a fully extended or "off" ¹ position to a fully depressed "on" position. The speed control switch 14 is not described here; it However, it should be noted that the trigger switch arrangement 12 in the embodiment shown has the trigger 13 »the speed control switch 14 and a reversing switch mechanism 18 according to the invention, this trigger switch arrangement being designed to belong together and compact for easy installation in a tool, device or the like _a. electrical lead wires 20-22 extending from said trigger switch assembly 12 and form part of an electric cable with which the tool is connected to a suitable source of electrical energy in a conventional manner.

The inverting switch 18 comprises any suitable one Material, e.g. B. malleable plastic, existing housing, which is integral with the rest of the trigger switch assembly executed or attached to this. The housing 24 has an opening 24a at its rear end (Figure 4) for Insertion of the components of the reversing switch 18, leaving the opening 24a easy insertion of the reversing switch device allowed.

An elongated lever 28 (FIGS. 1, 14, 15) is attached to the reversing switch, one of which is larger Has the end penetrating, generally rectangular opening 30 and a finger gripping portion 32 is provided at the opposite end thereof, wherein this section 32 has corrugations 34 on its underside is provided so that a finger of an operator on the

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Attack section and the lever can pivot in a generally horizontal plane about a generally vertical axis XX (Figure l). Projections 36 (FIGS. 14, 16) are preferably formed on opposite sides of the opening 30, the underside or the lower circumference of the opening 30 (FIG To couple lever 28 to the rotary segment _o As can best be seen from Figure 20, the upper portion 40 of the rotary segment 42 is preferably formed with lateral lips or projections 44 which lie below inclined cam surfaces 44a, these projections 44 with the aforementioned Projections 36 snap into the opening 30 of the lever, so that the lever 28 is coupled to the rotary segment 42 in a form-fitting manner. In the embodiment shown, the operating lever 28 protrudes rearward from the switch assembly and is accessible from the rear of the tool, but this lever could also protrude from either side of the tool or to the front »

The rotary segment 42 has an upper head part 46 (FIGS. 5, 19-20) and a lower locking part 48 (FIG. 5), the head part 46 having an opening 50 in its underside which telescopically receives the projection 52 formed on the locking part. The projection 52 preferably has opposite legs 52a (FIG. 5) which are received in complementary opposite recesses 53 on opposite sides of the opening 50 in the head part 46 (FIG. 19). The part 48 of the rotary segment 42 also has a laterally extending arm 54 which cooperates with a projection 56 formed on the underside of the insulating plate 58 (FIGS and l8 pivot positions shown can be moved, which are each on one side of the vertical center plane of the trigger switch assembly. You can see that the one with arm 54

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of the rotary segment 42 cooperating cam projection 56 ensures that the arm 54 is in one of its two angular positions is held, since a pivoting movement of the lever «28 is counteracted by the centrally arranged projection 56, which lies on the aforementioned vertical center plane of the trigger switch arrangement, as can be seen from FIG is. A fastening screw 60 penetrates a vertically extending hole 62 in the locking part 48 and acts with the upper head part 46 of the rotary segment 42 together, so that the locking part 48 with the head part 46 against a vertically directed movement is positively attached. In In this fixed position, the arm is in close proximity to the underside of the insulating plate 58, and the cam projection 56 of the plate 58 prevents pivoting movement of the arm in the manner previously discussed.

The head part 46 of the rotary segment 42 has on its underside (FIG. 19) arranged at a distance from one another, curved formed recesses 64 (Figures 17-20) which receive corresponding contacts 66, 66a (Figures 12, 13 »20), which move with the rotary segment 42 in one or the other of the two operating positions and the electric motor with it couple the energy source so that the electric motor is driven in one or the other direction of rotation. contacts 66, 66a are held relatively loosely in the associated recesses 64, and a spring 68 (FIGS. 5 and 20) acts in an opening 70 (FIG. 19) provided in each recess, so that the respective contacts 66, 66a are resiliently held in their respective recesses 64. The cylindrically shaped openings 70 are general formed in the middle of the respective contact recess 64, as can best be seen in FIG. Each spring 68 acts against the top of the respective opening 70 and against the Web part 72 (Figure 12) of the respective contact 66, 66a, see above that the contact is pressed forwards with respect to the respective recess 64. As best seen in Figure 12 forms the bottom of each contact 66 or 66a

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generally flat contact surfaces 72a, 72a ¹ which are spaced apart from one another and which are curved upwards at their inner ends at 74 and which end at the web part 72. Such an arrangement helps to ensure a smooth movement of the respective contact during the rotational movement of the rotary segment 42.

The reversing switch 18 also has a relatively stationary segment 76 (Figures 4, 6) which is seated in a slot 24a is arranged, this stationary segment 76 a lower sector 76a and an upper sector 76b (Figures 6, 7, 8, 9). The lower sector 76a has one, general rectangular, block-like shape and is provided with a central opening 78 into which the projection 52 of the lower Locking part 48 of the rotary segment 42 extends, when the reversing switch is mated. The top of sector 76a is at theirs in the embodiment shown opposite ends (Figure 9) with cross-shaped projections 80, each projection 80 being received flush in a complementary cruciform recess 82 is located at the bottom of the upper sector 76b of the stationary Segment 76 (Figures 5> 8) is added, so that the upper and lower sectors are aligned with respect to each other. As FIGS. 3 and 5 show, has upper sector 76b has a pair of spaced apart sections with a circular shape therebetween Limit opening 8l in which the head part 46 of the rotary segment 42 is rotatably received.

In the lower sector 76a there are generally transverse, vertically extending grooves 84 (Figure 5) formed, which a respective stationary electrical contact element 06 pick up and hold (Figures 5 and 11).

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Each stationary contact 86 is made of copper and has a head portion 86a and an arm 86b, the general runs perpendicular to the plane of the head part 86a. The arm 86b has an inclined surface 88 (Figure 11) on its edge, the assembly of the contact in its respective groove 84 in the lower sector 76a facilitated. As best seen in Figure 5, arm 86b extends generally transversely to the base of the lower sector, the head 86a lying on top of the lower sector 76a; thereby forms the surface 90 (Figure 11) of the contact is a surface on which attack the electrical contacts of the rotary segment 42 of the reversing switch. As Figure 7 shows, the areas are the contacts on the lower sector arranged so that they are diametrically opposed to each other. If the contacts are joined to the lower sector 76a, the surfaces 9 ^ of the contacts are parallel to the top of the sector block 76a, and arms 86b of contacts 86 extend along the bottom of the sector block so that the Contacts are held firmly to the under 'sector block.

There are openings in one side of the lower wektor block 76a 92 (Figures 5 and 6) formed, which are in associated Open chambers 92a, which receive spring grippers 94 (Figure 5), to which associated electrical conductors Ll and L2 are attached, which are also attached to the respective electrical Contacts 86 are attached to the lower sector 76a. In this Context it should be said that the housing 24 with complementary Openings is provided, the openings 92 opposite are provided and through which the stripped ends of the conductors Ll, L2 protrude (Figure 2).

The upper sector parts 76b are formed by the aforementioned cross-shaped recesses 82 so that the upper Sector 76b precisely positioned with respect to lower sector 76a can be. Each of the upper sector parts 76b has a transverse slot 100, wherein

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these slots receive a respective electrical contact 86 for mounting on the upper sector parts 76b .. In this In this case, however, the rear surface 104 (FIG. 11) of the head part 86a of the respective contact is used as the contact surface, and the arm 86b of the contact protrudes upwardly beyond this surface, as best seen in FIGS is. Resilient grippers 94a act with the respective contact at the upper sector together and attack a conductor L 3 or ΙΛ and keep it in electrical connection with the arm 86b of the respective contact, similar to what has already been done with reference to the grippers 94 on the lower sector 76a.

As FIG. 9 shows, the lower sector block 76a has slightly raised projections IO6 on its upper side, which for this purpose help to space the headers of the stationary contacts 86 on the stationary segment from one another soivie to position the contacts when assembling the segment. When the electrical contacts 86 with the upper and lower Sectors and the latter are assembled with one another, the contact surfaces 90 lie on the lower sector 76a and the Contact surfaces 104 of the contacts on the upper sector 76b essentially in the same horizontal plane, so that a quick current-conducting contact is made by the movable Contacts 66 and 66a can be made on the rotary segment 42. The upper and lower sectors 76b, 76a of the stationary segment and the rotating segment 42 may be made of a pressable plastic.

As FIGS. 4 and 10 show, the plastic housing 24 has a partition IO8 which has a cutout 108a (Figure 10), in which the locking part 48 of the rotary segment 42 is arranged, so that the rotary movement of the rotary segment is limited. As can be seen from Figure 10, the arm 54 of the locking part 48, which engages the peripheral edges of the cutout IO8 a, its pivoting movement after it has moved over the centrally located

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Arranged cam projection 56 on the insulating plate 58 is moved Has.

In FIGS. 17 and 18 it can be seen that when the lever 28 is in the position shown in FIG. 17 (which means pivoting the lever to the left side of the vertical longitudinal center plane of the switch arrangement when it is assembled with the tool according to FIG ), the electrical contact 66 on the rotary segment 42 makes contact with the surfaces 104 and 90 of the stationary contacts on the upper sector 76b and on the lower sector 76a, respectively, while the other contact 66a on the rotary segment makes contact with the surfaces 90 and 104, respectively the lower sector 76a and the upper sector 76b, respectively. In other words, a circuit is closed between the lines L3 and L2 and between the lines Ll and L4, so that, for example, the current supplied to the line Ll is transmitted via the line Lk and drives an electric motor in one direction of rotation. A pivoting movement of the rotary segment from the position shown in FIG. 17 into the position shown in FIG. 18 causes the contact 66 on the rotary segment 42 to make contact with the surfaces 90 or 104 of the lower or upper sector, while the contact 66a with surfaces 90 and 104 of the lower

or upper sector forms contact, whereby the current flow is reversed and the electric motor in the opposite direction Direction of rotation is driven. In other words, the line L2 is with the line L4 and the line Ll with connected to line L3. It can therefore be seen that a simple pivoting of the lever from that shown for example in FIG Position in the position shown in Figure l8

The direction of rotation of the motor is reversed. The switch can be connected to the electric motor circuit described in the US patent 3 467 8OI described in the general manner.

Figures 21 and 22 show a modified embodiment

for rotating the rotary segment 42, a ram device being used instead of the lever of the first embodiment.

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det. The upper portion 40 of the head part 46 of the rotary segment 42 cooperates with a yoke 112, which with the rotary segment is designed as a unit and is pivotable in a generally horizontal plane about the X-X axis. Plunger 114, Il4a are movably connected at 116 to the yoke 112, with the plungers extending rearwardly through openings 118 in the rearward Part of the tool handle 10 extend so that they are accessible. The insertion of one or the other of the

The ram 114 or Il4a causes the rotary segment to pivot in one or the other operating position to control the direction of rotation of the motor.

From the above description and the drawings it can be seen that the invention provides a novel reversing switch for Mounting in an electrically powered tool or device or the like is created, with which the direction of rotation can be selected of an electric motor is reversed, wherein a compact switch arrangement is provided with a relative stationary segment and a rotating segment, and wherein the stationary segment has a plurality of stationary contacts and the rotary segment has a plurality of contacts that rotate with the rotary segment «, the rotary segment can be moved to a variety of working positions, wherein in one of the positions of the rotary segment the motor in one direction and in another position of the rotary segment the motor is driven in the opposite direction. The invention creates a reversing switch, which can be used together with a trigger arrangement, so that the direction of rotation of the motor is reversed together with the actuation of the trigger to control the electric motor can be.

Patent claims:

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Claims (1)

Claims / l. ^ Electric reversing switch, marked also a stationary holding segment (76) with a plurality of stationary electrical contacts (86) and through a rotatable holding segment (42) with a plurality of spaced apart electrical contacts (66, 66a), wherein the rotatable holding segment (42) means (28) for rotating the rotatable holding segment (42) with respect to the stationary holding segment (76) in a plurality of operating positions in which the contacts (66, 66a) of the rotatable support segment (42) with the contacts (86) of the stationary support segment (76) in a predetermined manner form, whereby the direction of current flow through the switch is reversed according to the position of the rotatable Holding segment (42) with respect to the contacts (86) of the stationary holding segment (76). 2. Reversible switch according to claim 1, characterized in that t that the stationary holding segment (76) consists of a lower (76a) and an upper (76b) sector consists, wherein on the upper sector (76b) a plurality of the stationary contacts (86) and on the lower sector (76a) a plurality of the stationary contacts (86) is supported and wherein the contacts (86) are generally coplanar Have contact surfaces (90, 104) and, if the holding segment (76) is joined together, the contact surfaces (90, 104) of the contacts (86) essentially in a common plane and come into relative sliding contact with the contacts (66, 66a) of the rotatable retaining segment (42). 3 · reversible holder according to claim 2, characterized in that that each of the stationary contacts (86) has a head part (86a) on which the contact surface (90) is provided on which the contacts (66, 66a) of the rotatable holding segment (42) slidingly attack, as well as 209832 / 08A1 LU 3012 - Λ »- an arm part (86b) which is in a to the head part (86a) in is essential vertical plane and acts on an electrical power supply line, each of the Sectors (76a, 76b) is provided with means for holding the respective stationary contacts (86) and for orientation of the head parts (86a) of the contacts (86) in a substantially common level if the sectors (76a, 76b) are joined together. 4. reversing switch according to claim 2, characterized by a housing (24) for holding the joined sectors (76a, 76b) and by means (40, 44) on the rotatable holding segment (42) which protrude outwardly with respect to the housing (24) and the means for rotation of the rotatable holding segment (42) with respect to the stationary holding segment (76). 5 ο reversible holder according to claim 2, characterized in that that the contacts (66, 66a) of the rotatable holding segment (42) are oriented generally vertically and are curved and that means (68,70) are provided through which the contacts (66, 66a) on the rotatable Holding segment (42) are resiliently held for performing an adjustment movement of the contacts in a generally vertical direction Directions. 60 reversing switch according to claim 2, characterized in that that each of the contacts (66, 66a) of the rotatable holding segment (42) laterally at a distance from one another has arranged shoe-like parts and a web part electrically connecting the two shoe-like parts (72), wherein the contact (66, 66a) is curved in plan and corresponding pairs of the stationary contacts (86) bridged on the stationary holding segment (76). 209832/0841 7 «He reverses according to claim 2, characterized by means for releasably holding the rotatable segment (42) in a predetermined position in relation to on the stationary segment (76). 8. reversing switch according to claim 2, characterized in that the rotatable holding segment (42) has locking means (54) extending along the underside of the stationary retaining segment (76), whereby the rotatable holding segment (42) in a predetermined position with respect to the stationary holding segment (76) and in positions in which the contacts (66, 66a) of the rotatable retaining segment (42) are in contact with respective pairs of the stationary contacts (86) of the stationary holding segment (76) lie. 9 β reversing switch according to claim 2, characterized in that that the rotatable holding segment (42) has a head part (46) and a locking part (48) comprises, wherein the locking part (48) has a projection (52) and the head part (46) has a recess (50) for receiving of the projection (52), and that means (5 ^ a »53) are provided are which cooperate between the parts (46, 48) for releasably securing the parts to one another, the Locking part (48) has an arm (54) which is laterally protrudes from the head part (46) and is pivoted upon rotational movement of the rotatable holding segment (42), and wherein a Stop (56) is provided on the switch (l8), which interacts with the arm (54) and the rotatable holding segment (42) held in a selected one of two predetermined positions 10. Reversible switch according to claim 2, characterized in that that on the sectors (76a, 76b) means are provided for positioning the upper sector (76b) in a predetermined position with respect to the lower one 209832 / 08A1 LU 3012 - Jr - Sector (/ 6a) and vice versa, with projections on sector (76a) (80) are provided which engage in recesses (82) in the other sector (76b) so that the sectors (76a, 76b) are oriented with respect to one another. 11. Reversing switch according to claim 3 »marked by a housing (24) enclosing the sectors (76a, 76b), the rotatable Ilaltesegment (42) protrudes outwardly from the housing (24) and forms the means (28) for rotating the rotatable support segment (42) and openings are provided in the housing (24) through which power lines in contact with the arm portions (86b) and connect the respective stationary contact (86) with a corresponding power line * 12. The reverse s ehalts according to claim 11, characterized in that Greif'ermittel (94, yka.) Are provided on the sectors (76a, 76b) which cooperate with each of the stationary contacts (86) and each have a power line in contact resiliently hold with the arm part (86b) of a respective stationary contact (86) 13 »reversing switch according to claim 3» characterized that the lower sector (76a) consists of an elongated block-like part in which spaced apart grooves (84) are formed which receive the respective stationary contacts (86), wherein the grooves (84) with both the upper and the Underside of the block (? 6a) are connected so that the contacts (86) extend along both surfaces «= l4. Reversing switch according to Claim 2, characterized in that it is characterized t that the upper sector (76b) is made up of a pair of separated from each other in the lateral direction lying parts, each part having recesses (82) on its underside, which with projections (8O) 209832/0841 on the lower sector (76a) cooperate and the upper sector parts with respect to the lower sector (76a) are oriented, · Reversing switch according to claim 2, characterized by a cooperating with the switch Control switch (l4) to selectively change the speed of an engine. l6. Reversing switch according to Claim 2, characterized in that that with the reversing switch (l8) a trigger arrangement for a power tool is combined, the trigger arrangement having a movable trigger (I3) for controlling the energy supply of a Has electric motor upon movement of the trigger (13), and that means are provided for selectively actuating the rotatable holding segment (42) so that the rotatable holding segment (42) from his one division of operations to his other Operating position and vice versa is moved. 17 ο reversing switch according to claim l6, characterized t that the lever (28) has a part cooperating with the rotatable holding segment (42), so that the holding segment (42) is rotated when the lever (28) is pivoted. l8. Reversing switch according to Claim 171, characterized in that it is g e k f. · η η ζ e backrest t that on dom lever (28) means (JU, 36) are provided with means (40) at the top of the drnhbaren Hal tesegments (42) come into snap connection and the lever (l.8) with the twisted shark. tea segment (42) coupling, the lever (28) from the rotatable holding; segment (42) protrudes laterally and is pivotable in a generally horizontal plane. 19o reversing switch according to claim 1, characterized by means for selective actuation of the rotary 209832/0841 JS ble holding segment (42) from its one to its other operating position and vice versa, this means plunger (ll4, Il4a) which, when actuated, cause the rotatable holding segment (42) to be actuated. 20. Reversing switch according to claim 19, characterized that said means have a yoke (112) coupled to the rotatable holding segment (42), which is pivotable in a generally horizontal plane, and that the tappets are two spaced apart Tappets (114, Il4a) are movably connected to the yoke (112) and generally protrude laterally therefrom, wherein an insertion of one of the plungers (114, Il4a) causes an actuation of the rotatable holding segment (42), see above that this moves from its one to its other operating position. 209832/0841 to Blank page