Pen for writing and drawing purposes

Abstract

A pen for writing and/or drawing purposes, and having a shaft and a core which is arranged within the shaft and is axially adjustable in the longitudinal direction of the shaft between an active position and an inoperative position. The core is completely arranged within the shaft in the inoperative position and projects with an overhang from a front end of the shaft in the active position. An actuating element is provided which is movable perpendicularly to the longitudinal direction of the shaft between an active position and an inoperative position and which is operatively connected to the core via a connecting element in such a way that, during a movement of the actuating element perpendicularly to the longitudinal direction of the shaft between the inoperative position and the active position, the core is axially adjustable in the longitudinal direction of the shaft.

Claims

1. A pen for writing and/or drawing purposes, the pen comprising: a shaft having a front end; a core disposed within said shaft and axially adjustable in a longitudinal direction of said shaft between an active position and an inoperative position, said core being disposed completely within said shaft in the inoperative position and protrudes with an overhang from said front end of said shaft in the active position; a connecting element; an actuating element being movable perpendicularly to the longitudinal direction of said shaft between an active position and an inoperative position and which is operatively connected to said core via said connecting element in such a way that, during a movement of said actuating element perpendicularly to the longitudinal direction of said shaft between the inoperative position and the active position, said core is axially adjustable in the longitudinal direction of said shaft; and said connecting element having a first end portion, a second end portion and a central portion and being rotatably mounted on said shaft in said central portion, said first end portion of said connecting element being mounted on said actuating element, and said second end portion of said connecting element being mounted directly or indirectly on said core.

2. The pen according to claim 1, wherein: said connecting element is of a one-part design; or said connecting element has at least two connecting members which are each connected to one another in an articulated manner.

3. The pen according to claim 2, further comprising a guide element for guiding said core that is disposed within said shaft between said core and said connecting element, said guide element is axially adjustable in the longitudinal direction and has a receptacle for receiving a rear end portion of said core; and wherein said connecting element or one of said two connecting members is mounted on said guide element.

4. The pen according to claim 1, wherein: said shaft has a first lateral surface and a second lateral surface; and in the inoperative position, said actuating element protrudes at least partially from said first lateral surface of said shaft and, in the active position, protrudes at least partially from said second lateral surface of said shaft that is opposite to said first lateral surface.

5. The pen according to claim 4, wherein said actuating element has a first longitudinal portion which extends in the longitudinal direction of said shaft and a second longitudinal portion which extends perpendicularly to the longitudinal direction and which is disposed at least partially within said shaft, wherein, in the inoperative position, at least said first longitudinal portion protrudes from said first lateral surface of said shaft and, in the active position, said second longitudinal portion protrudes by way of a free end at least partially from said second lateral surface of said shaft that is opposite to said first lateral surface.

6. The pen according to claim 5, wherein: said shaft has a clearance formed therein; said free end of said second longitudinal portion of said actuating element has a smaller width than an adjoining central portion of said second longitudinal portion; and said free end is at least partially disposed in said clearance of said shaft.

7. The pen according to claim 1, wherein said actuating element has at least one stop surface which interacts with an inner peripheral surface of said shaft in the active position and/or inoperative position.

8. The pen according to claim 1, wherein said actuating element has a clearance formed therein in which said first end portion of said connecting element is mounted.

9. The pen according to claim 8, wherein starting from a front end side of said actuating element, said clearance at least partially extends into said actuating element in the longitudinal direction of said shaft, and said first end portion of said connecting element is movably mounted in said clearance.

10. The pen according to claim 1, further comprising a locking and/or latching device, said core can be fixed in the active position and/or in the inoperative position by said locking and/or latching device.

11. The pen according to claim 10, wherein: said connecting element has a first and a second connecting member; and said locking and/or latching device is formed by a joint which connects said first and said second connecting member of said connecting element.

12. The pen according to claim 1, further comprising at least one guide for guiding said connecting element and/or said actuating element in said shaft during a movement of said actuating element and of said core.

13. The pen according to claim 12, wherein: said actuating element has a lateral surface with at least one receptacle formed in said lateral surface and extending perpendicular to the longitudinal direction; and said guide for guiding said actuating element in said shaft during a movement of said actuating element includes at least one projection which protrudes from an inner peripheral surface of said shaft, extends perpendicularly to the longitudinal direction of said shaft and interacts in a sense of a sliding pair with said at least one receptacle.

14. The pen according to claim 13, wherein: wherein said actuating element has a first longitudinal portion and an end portion; and said receptacle is formed by a projection which protrudes from said lateral surface of said actuating element and extends perpendicularly to the longitudinal direction starting from said first longitudinal portion and at least partially along said lateral surface, and by said end portion of said actuating element, which projects with an overhang beyond said lateral surface.

15. The pen according to claim 13, wherein: said actuating element has a first longitudinal portion which extends in the longitudinal direction of said shaft and a second longitudinal portion which extends perpendicularly to the longitudinal direction and which is disposed at least partially within said shaft; and said receptacle is formed by a projection which protrudes from said lateral surface of said second longitudinal portion of said actuating element, and extends perpendicularly to the longitudinal direction starting from said first longitudinal portion and at least partially along said lateral surface, and by said second longitudinal portion of said actuating element, which projects with an overhang beyond said lateral surface.

16. The pen according to claim 1, wherein: said actuating element has a first longitudinal portion which extends in the longitudinal direction of said shaft and a second longitudinal portion which extends perpendicularly to the longitudinal direction and which is disposed at least partially within said shaft; and said second longitudinal portion of said actuating element has a clearance formed therein in which said first end portion of said connecting element is mounted.

17. The pen according to claim 16, wherein starting from a front end side of said second longitudinal portion of said actuating element, said clearance at least partially extends into said actuating element in the longitudinal direction of said shaft, and said first end portion of said connecting element is movably mounted in said clearance.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) The invention will be explained in more detail with reference to the exemplary embodiments illustrated in the appended drawings, in which:

(2) FIG. 1 shows an exploded illustration of a pen,

(3) FIG. 2 shows a side view of a pen in the inoperative position,

(4) FIG. 3 shows a perspective illustration of the pen according to FIG. 2,

(5) FIG. 4 shows a longitudinal section taken along the line IV-IV in FIG. 2,

(6) FIG. 5 shows a longitudinal section taken along the line V-V in FIG. 3 in a perspective illustration,

(7) FIG. 6 shows a partial detail of the pen according to FIG. 4,

(8) FIG. 7 shows a front view of the pen according to FIG. 2,

(9) FIG. 8 shows a side view of a pen in the active position,

(10) FIG. 9 shows a perspective illustration of the pen according to FIG. 8,

(11) FIG. 10 shows a longitudinal section taken along the line X-X in FIG. 8,

(12) FIG. 11 shows a longitudinal section taken along the line XI-XI in FIG. 8 in a perspective illustration,

(13) FIG. 12 shows a partial detail of the pen according to FIG. 10,

(14) FIG. 13 shows a front view of the pen according to FIG. 8,

(15) FIG. 14 shows a plan view of a pen according to FIG. 8,

(16) FIG. 15 shows an exploded illustration of a pen according to a further embodiment,

(17) FIG. 16 shows a partial detail of a pen according to a further embodiment in the inoperative position,

(18) FIG. 17 shows a partial detail of a pen according to a further embodiment in the active position.

DESCRIPTION OF THE INVENTION

(19) FIG. 1 shows an exploded illustration of a pen 2 for writing and/or drawing purposes, having a shaft 4 and having a core 6. The shaft 4 comprises a first elongate shaft part 4a, a second elongate shaft part 4b and a third conical shaft part 4c. The first shaft part 4a and the second shaft part 4b each at least substantially have a U-shaped cross-sectional profile, with the open sides of the shaft parts 4a, 4b facing one another in the mounted state. In the mounted state, the second shaft part 4b is arranged within the first shaft part 4a and is for example held clamped therein or additionally adhesively bonded or fixed by means of a tongue-groove connection. Integrally formed on a front end portion of the second shaft part 4b are retaining elements 8a which, in the mounted state, engage in a form-fitting manner in complementarily formed retaining elements 8b of a rear end portion of the third shaft part 4c. The first, outer shaft part 4a can be produced from wood, for example, in order to impart a good tactile and visual impression to the user. In principle, the shaft 4 can also be formed in one piece, but a multipart shaft 4 has the advantage that, on the one hand, the assembly of the pen 2 is facilitated and, on the other hand, the mechanical components necessary for actuating the core 6 are for the large part not visible to the outside.

(20) The core 6, for example a ballpoint pen core in the present case, having a reservoir 6a for storing the ink paste and a writing tip 6c bearing a writing ball 6b is arranged within the shaft 4, to be more precise within its inner part, namely within the second shaft part 4b, and is axially adjustable in the longitudinal direction L of the shaft 4 between an active position and an inoperative position. In the inoperative position (FIGS. 2 to 8), the core 6 is arranged completely within the shaft. In the active position (FIGS. 9 to 14), the core 6 projects by way of its front end, that is to say a part of the writing tip 6c and of the writing ball 6b, with an overhang from a front end of the shaft 4 or of the shaft part 4c.

(21) The pen 2 has, on a rear end, an actuating element 10 which is movable between an inoperative position and an active position in a movement direction B extending perpendicularly to the longitudinal direction L and which, for axial adjustment of the core 6, is operatively connected thereto via a connecting element 12, with the result that, during a movement of the actuating element perpendicularly to the longitudinal direction of the shaft between the inoperative position and the active position, the core is axially adjustable in the longitudinal direction of the shaft. The actuating element 10 has a first longitudinal portion 10a which extends in the longitudinal direction L of the shaft 4 and an adjoining base body or second longitudinal portion 10b which extends perpendicularly to the longitudinal direction L starting from the first longitudinal portion 10a.

(22) A guide element 14 for guiding the core 6 is arranged within the shaft 4 between the core 6 and the connecting element 12 and is axially adjustable in the longitudinal direction L, with the result that the connecting element 12 is indirectly connected to the core 6 via the guide element 14. Here, in the mounted state, the connecting element 12 can be fastened to the guide element 14. The guide element 14 has a receptacle 14a for receiving a rear end of the core 6. A part of an outer peripheral surface 14b of the guide element 14 is formed in a complementary manner to an inner peripheral surface of the shaft 4 or of the shaft part 4b in order to allow problem-free sliding.

(23) The pen 2 has, on a front end, a resetting element, in the present case a spring 16, which surrounds the writing tip 6c in the mounted state and prestresses the core 6 in the active position in a longitudinal direction L of the shaft 4. In the mounted state, the spring 16 is supported by a first end 16a on a front end side 18 of the core 6 or of the reservoir 6a and by a second end 16b on an inner peripheral surface of the conical shaft part 4c, in particular on a stop surface formed on the inner peripheral surface. In the active position, the spring 16 is prestressed, that is to say compressed, and, in the inoperative position, the spring 16 is relaxed. The spring 16 always presses the guide element 14 in the direction of the rear end of the pen 2 and thus against the connecting element 12, with the result that a fastening of the connecting element 12 in or on the guide element 14 is not absolutely necessary.

(24) According to the exemplary embodiment, the connecting element 12 comprises a first connecting member 12a and a second connecting member 12b which are connected to one another so as to be pivotable about a pivot axis S. The first connecting member 12a comprises two plate-shaped elements which are arranged parallel to one another and which are connected at two opposite end portions via a respective web 20. In the exemplary embodiment, the joint 22 connecting the first connecting member 12a to the second connecting member 12b is formed by one of these webs 20 and a clearance 24 in the second connecting member 12b.

(25) The connecting element 12, the first connecting member 12a according to the exemplary embodiment, is rotatably mounted in a central portion 26a about an axis of rotation D on the shaft 4, to be more precise on the inner part of the shaft 4, namely the shaft part 4b. For this purpose, the plate-shaped elements of the first connecting member 12a each have a through-hole 34 through which there is plugged a connecting element 30, in the present case a cylindrical pin, which is in turn is mounted in a clearance 32 of the shaft 4 or of the second shaft part 4b. A first end portion 26b of the connecting element 12 or of the first connecting member 12a is fastened to the actuating element 10, namely to its second longitudinal portion 10b, and a second end portion 28a of the connecting element 12 or of the second connecting member 12b is fastened to the guide element 14, that is to say indirectly mounted on the core 6. The mutually facing end portions 26c, 28b of the first connecting member 12a and of the second connecting member 12b are pivotably connected via the joint 22.

(26) The pen 2 has guide means 36 for guiding the connecting element 12 in the shaft 4 or the second shaft part 4b during a movement of the actuating element 10 and of the core 6. According to the present exemplary embodiment, the guide means 36 comprises a clearance 38 which is formed in the shaft 4 or the second shaft part 4b and in which the connecting element 12 is indirectly guided. Furthermore, the guide means 36 comprises a connecting element 40, for example likewise a cylindrical pin, which is plugged through a through-hole 42 incorporated in the second connecting member 12b and through a through-hole 44 incorporated in the guide element 14. The connecting element 40 is mounted in the clearance 38, which is designed as a slot in the present case, in order to guide the connecting element 12 or the second connecting member 12b during a movement of the core 6 from the inoperative position into the active position, and vice versa.

(27) The pen 2 has guide means 46 for guiding the actuating element 10 in the shaft 4 or the second shaft part 4b during a movement of the actuating element 10 and of the core 6. The guide means 46 comprises a projection 50 which projects from an inner peripheral surface 48 of the shaft 4 or of the second shaft part 4b and which extends perpendicularly to the longitudinal direction L of the shaft 4. Furthermore, the guide means 46 comprises a receptacle 54 which is formed on a lateral surface 52 of the actuating element 10 or its second longitudinal portion 10b and which extends perpendicularly to the longitudinal direction L and, in the mounted state, parallel to the projection 50. During a movement of the actuating element in the movement direction B, the receptacle 54 and the projection 50 interact in the sense of a sliding pair.

(28) Here, the receptacle 54 is formed by a projection 56 which protrudes from the lateral surface 52 of the actuating element 10 or its second longitudinal portion 10b, is perpendicular to the longitudinal direction L starting from the first longitudinal portion 10a and extends up to a free end 49 of the second longitudinal portion 10b, and by an end portion 58 of the actuating element 10 or its second longitudinal portion 10b that projects with an overhang beyond the lateral surface 52 in the direction of a rear end of the shaft.

(29) FIGS. 2 to 8 show the pen 2 in various views while it is situated in the nonuse state, both the core 6 and the actuating element 10 thus being in the inoperative position. The core 6 is arranged completely within the shaft 4 in the inoperative position. In the inoperative position, the actuating element 10 protrudes partially, namely by way of its first longitudinal portion 10a and a part of the second longitudinal portion 10b, with an overhang A.sub.1 from a first lateral surface 60a of the shaft 4 or from an upper side of the shaft 4. According to FIG. 2, in which the pen 2 is shown without the outer, first shaft part 4a in order to better illustrate the guide means 36, the connecting element 40 is arranged in the inoperative position at a rear end of the clearance 38. FIG. 3 shows a pen 2 with an outer first shaft part 4a which conceals the guide means 36 and consists of wood or plastic, for example.

(30) FIGS. 4 and 5 respectively show a longitudinal section taken along the line IV-IV in FIG. 2 and along the line V-V in FIG. 3, and FIG. 6 shows a detail view of a rear portion of the pen 2. Both the actuating element 10 and the core 6 and also the connecting element 12 are situated in the inoperative position. In the inoperative position, the first connecting member 12a of the connecting element 12 is arranged virtually parallel to the actuating element 10. A first end portion 26b of the first connecting member 12a is mounted in a clearance 62 of the actuating element 10 or of the second longitudinal portion 10b of the actuating element 10. Starting from a front end side 64 of the actuating element 10 or of the second longitudinal portion 10b of the actuating element 10, the clearance 62 partially extends into the actuating element 10 in the longitudinal direction of the shaft. The connecting element 12 or the first connecting member 12a is movably mounted in the clearance 62 by means of the cylindrical web 20 arranged in the clearance 62. If the actuating element 10 is moved perpendicularly to the longitudinal direction L of the shaft in the movement direction B, the first end portion 26b of the connecting element 12 or of the first connecting member 12a is carried along by the actuating element 10 and thus likewise moved perpendicularly to the longitudinal direction L of the shaft. This brings about a rotation of the connecting element 12 or of the first connecting member 12a about the axis of rotation D or about the fixed point F at which the connecting element is mounted in a positionally fixed but rotatable manner on the shaft 4. The second end portion of the first connecting member 12a is consequently moved both in the longitudinal direction L of the shaft 4 and upward, that is to say perpendicularly to the longitudinal direction L of the shaft 4, and consequently pushes the second connecting member 12b, which is connected thereto via the joint 22, and hence the core 6 in the longitudinal direction L of the shaft into the active position.

(31) The free end 49 of the second longitudinal portion 10b of the actuating element 10 has a smaller width B.sub.1 than a width B.sub.2 of an adjoining central portion 66 of the second longitudinal portion 10b. The free end 49 is also partially arranged in a clearance 68 of the shaft 4 in the inoperative position in order to avoid jamming or blocking of the actuating element 10 at the start of the movement.

(32) In the active position, the core can be fixed by a locking device which is here realized by the joint 22 connecting the first and the second connecting member 12a, 12b of the connecting element 12. By rotating the first connecting member 12a about the rotation point, the joint 22 is moved beyond the dead center and an uncontrolled backward movement of the core 6 from the active position into the inoperative position during the writing operation is thus prevented.

(33) FIGS. 8 to 13 show the pen 2 in various views while it is situated in the use state or in the writing position, both the core 6 and the actuating element 10 thus being in the active position. In the active position, the second longitudinal portion 10b of the actuating element 10 protrudes partially, specifically by way of a free end 49, with an overhang A.sub.2 from a second lateral surface 60b of the shaft 4 that is situated opposite to the first lateral surface 60a of the shaft. The core 6 protrudes with an overhang C from the front end of the shaft 4.

(34) The free end 49 of the second longitudinal portion 10b of the actuating element 10 has a smaller width B.sub.1 than an adjoining central portion 66 of the second longitudinal portion 10b. The free end 49 is arranged completely in a clearance 68 of the shaft 4 and additionally protrudes beyond the second lateral surface 60b. In order to move the core 6 from the active position back into the inoperative position again, the locking device can be released by pressing on the free end 49 of the actuating element and the core 6 is moved back into the inoperative position by rotation of the connecting element 12 or of the connecting member 12a by means of the spring 16 which is prestressed in the active position.

(35) As can be seen in particular in the detail view in FIG. 12, the actuating element 10 has a stop surface 70 which bears against the inner peripheral surface 48 of the shaft 4 in the active position and prevents a further movement of the actuating element 10 and also signals to the user that the end position has been reached. The stop surface 70 is formed by a lower lateral surface 72 of the central portion 66 of the second longitudinal portion 10b of the actuating element 10.

(36) FIG. 15 shows an exploded illustration of a further embodiment of the pen 2 for writing and/or drawing purposes which substantially has the features according to the above-described pen 2, and therefore reference is predominantly made thereto. Corresponding features are labeled with identical reference signs. The pen 2 comprises a shaft 4 having a first elongate shaft part 4a, a second elongate shaft part 4b, a third conical shaft part 4c and a fourth shaft part 4d which in the present case serves in particular to connect the second shaft part 4b to the third shaft part 4c. The core 6, once again for example a ballpoint pen core, having a reservoir 6a for storing the ink paste and a writing tip 6c bearing a writing ball 6b is arranged within the shaft 4, to be more precise within its inner part, namely within the second shaft part 4b, and is axially adjustable in the longitudinal direction L of the shaft 4 between an active position and an inoperative position. In the inoperative position, the core 6 is arranged completely within the shaft and, in the active position, the core 6 protrudes by way of its front end with an overhang from a front end of the shaft 4 or of the shaft part 4c. A resetting element or a spring 16 once again prestresses the core 6 in the active position in a longitudinal direction L of the shaft 4.

(37) The pen 2 once again has, on a rear end, an actuating element 10 which can be moved between an inoperative position and an active position in a movement direction B extending perpendicularly to the longitudinal direction L, said actuating element having a first longitudinal portion 10a and a second longitudinal portion 10b and, for axial adjustment of the core 6, being operatively connected thereto via a connecting element 12, with the result that, during a movement of the actuating element 10 perpendicularly to the longitudinal direction of the shaft between the inoperative position and the active position, the core is axially adjustable in the longitudinal direction of the shaft.

(38) The difference over the pen described in FIGS. 1 to 14 now consists in the design of the guide element 14 or 114 and of the connecting element 12 or 112. The guide element 114 is arranged within the shaft 4 between the core 6 and the connecting element 112 and is axially adjustable in the longitudinal direction L, with the result that the connecting element 112 is indirectly connected to the core 6 via the guide element 114. The guide element 114 has a receptacle 114a for receiving a rear end of the core 6. A part of an outer peripheral surface 114b of the guide element 114 is formed in a complementary manner to an inner peripheral surface of the shaft 4 or of the shaft part 4b to allow problem-free sliding.

(39) The connecting element 112 comprises for example a first connecting member 112a and a second connecting member 112b which are connected to one another so as to be pivotable about a pivot axis S. The first connecting member 112a comprises two plate-shaped elements which are arranged parallel to one another and which are connected at two opposite end portions via a respective web 120. The joint 122 which connects the first connecting member 112a to the second connecting member 112b is once again formed by one of these webs 120 and a clearance 124 in the second connecting member 112b.

(40) The connecting element 112, the first connecting member 112a according to the exemplary embodiment, is rotatably mounted in a central portion 126a about an axis of rotation D on the shaft 4, to be more precise on the inner part of the shaft 4, namely the shaft part 4b. For this purpose, the plate-shaped elements of the first connecting member 112a each have a clearance 134 through which there is plugged a connecting element 130, in the present case a cylindrical pin, which once again is mounted in a clearance 132 of the shaft 4 or of the second shaft part 4b. A first end portion 126b of the connecting element 112 or of the first connecting member 112a is fastened to the actuating element 10, namely to its second longitudinal portion 10b, and a second end portion 128a of the connecting element 12 or of the second connecting member 112b is fastened to the guide element 14, that is to say indirectly mounted on the core 6. The mutually facing end portions 126c, 128b of the first connecting member 112a and of the second connecting member 112b are pivotably connected via the joint 122.

(41) To guide the connecting element 112, the pen 2 has guide means 136 according to an alternative variant. According to the present exemplary embodiment, the guide means 136 comprises a connecting element 140 (shown in dotted line), for example likewise a cylindrical pin, which is mounted within or fastened to the guide element 114. In this case, instead of the through-hole, a clearance 142 is provided on the second end portion 128a of the connecting element 112 or of the connecting member 112b and engages around the connecting element 140 fixed within the guide element 114 in such a way that the connecting element 112 is held within the guide element 114 during a movement in the axial direction.

(42) FIGS. 16 (inoperative position) and 17 (active position) show a detail of a rear end portion of a pen 2 (not explicitly represented) in which the connecting element 212 comprises only a first, that is to say a single, connecting member, with the result that the connecting element 212 is of one-part design. If the core does not have to cover a large path, that is to say such a large step-up is not required, such a design offers the advantage that material can be saved.

(43) The connecting element 212 is mounted on the shaft 4 so as to be rotatable about an axis of rotation D. The connecting element 212 is mounted by a first end portion 226b in a clearance 62 which extends into the actuating element 10 from a front end side 64 thereof. A front end portion 226c of the connecting element 212 is mounted on the guide element 14 and thus indirectly connected to the core 6. In the active position, the connecting element 212 extends substantially in the longitudinal direction L of the shaft 4, i.e. the front end portion 226b and the rear end portion 226c are arranged behind one another in the longitudinal direction. The connecting element 212 is rotated about the axis of rotation by the actuation of the actuating element 10 to such an extent that a resetting force of the resetting element that presses the guide element 14 against the front end portion 226c of the connecting element 212 is not sufficient to cause a back-rotation of the connecting element 212. As a result, the core 6 is locked in the active position. Only a movement of the actuating element from the active position into the inoperative position brings about a rotation of the connecting element 212 and thus a release of the locking. In the inoperative position, the connecting element 212 bears flat against a rear end side 214 of the guide element 14 and extends substantially transversely to the longitudinal direction L of the shaft 4, i.e. the front end portion 226b and the rear end portion 226c are arranged next to one another in the transverse direction.

(44) Further components of the pen 2 of the exemplary embodiment according to FIGS. 16 and 17 correspond to those of the exemplary embodiment with a connecting element 12 having two connecting members 12a, 12b, and therefore they are provided with the same reference signs and reference is made in this respect to the statements above.

REFERENCE SIGNS

(45) 2 Pen 4 Shaft 4a First shaft part 4b Second shaft part 4c Third shaft part 6 Core 6a Reservoir 6b Writing ball 6c Writing tip 8a,b Retaining elements 10 Actuating element 10a First longitudinal portion of the actuating element 10b Second longitudinal portion of the actuating element 12, 112, 212 Connecting element 12a, 112a First connecting member 12b, 112b Second connecting member 14, 114 Guide element 14a,114a Receptacle of the guide element 14b, 114b Outer peripheral surface of the guide element 16 Spring 16a First end of the spring 16b Second end of the spring 18 Front end side of the core 20, 120 Web 22, 122 Joint 24, 124 Clearance 26a, 126a Central portion of the first connecting member 26b, 126b First end portion of the first connecting member 26c, 126c Second end portion of the first connecting member 28a, 128a Second end portion of the second connecting member 28b, 128b First end portion of the second connecting member 30, 130 Connecting element 32, 132 Clearance 34, 134 Through-hole 36, 136 Guide means 38 Clearance 40, 140 Connecting element 42 Through-hole 44 Through-hole 46 Guide means 48 Inner peripheral surface of the shaft 49 Free end of the actuating element 50 Projection 52 Lateral surface of the actuating element 54 Receptacle 56 Projection 58 End portion of the actuating element 60a First lateral surface of the shaft 4 60b Second lateral surface of the shaft 4 62 Clearance 64 Front end side of the actuating element 66 Central portion of the actuating element 68 Clearance 214 Rear end side of the guide element 226a Central portion of the connecting element 212 226b First end portion of the connecting element 212 226c Second end portion of the connecting element 212 L Longitudinal direction of the shaft S Pivot axis D Axis of rotation B Movement direction of the actuating element F Fixed point C Overhang of the core B.sub.1 Width of the free end of the actuating element B.sub.2 Width of the central portion of the actuating element