DE8316353U1 - Directional lock for a time switch - Google Patents

Description

ta · <· «> ·· Il Il HH

• ·> · i ta ·

• t · · tiff> ■ ·

·· · I · I tt ι I · I

ι · · ■ · 1 Cl Il ··

DIEHL GMBH & CO *, 8500 Nuremberg

Directional lock for a time switch

The invention relates to a directional lock for a dial clock via which a drive part controls a time switch part drives, which compared to the drive part in one direction of rotation against a greater resistance i

torque than in the other direction of rotation manually is adjustable, the directional lock having a ring with internal teeth coupled to the drive part and a non-rotatably connected to the timer part, coaxial to the ring pawl body with little- at least two arms lying in the plane of the ring

which grip with a finger in the radial direction / ₍ resiliently into the internal toothing,

which is pressed out of the internal toothing during an adjustment in one or the other direction of rotation is, with the from internal teeth and fingers

existing pairing on the first pairing part to the radius of the ring angle-symmetrical tooth flanks. intended are.

Such a directional lock is in DE-PS 29 15

ι ι

ο ι t (»a · ·

described. The manual turning of the time switch part to time setting activates the directional lock low section modulus, so that the manual time setting only requires little effort requires. In the opposite direction of rotation the section modulus is much higher, so that from the drive part to the time switch part is sufficient to carry out the respective switching operations

/ λ large driving torque is exerted. In a violent

When the time switch part is rotated against the actual direction of adjustment, the fingers get caught also from the engagement of the internal toothing, whereby the risk of damage to the face lock is resolved.

15th

In DE-PS 29 15 526 in the two

Rotational directions of different resistance moments achieved in that two joints are formed on the arm which are at a different effective distance from the finger. Such a training of the

Klinkönkörpers is complex to realize. '* This also applies if the latch body is used as a

lumpy plastic part, in particular plastic injection molded part, is constructed in which the joints are formed by cross-sectional thinning of the arm. Because the flexural elasticity of the thinned cross-sectional zones must be coordinated with one another. If the If bending is limited to small areas of the arm, the plastic material in these zones tends to Signs of fatigue.

I ·
I> I

II In DE-PS 28 13 O69 a directional lock is described

jf ben that at a violent twisting of time

switching part is destroyed against the actual adjustment direction,

■ 5

^{1 The} object of the invention is to provide a directional lock

"■ to propose the type mentioned at the beginning, whose func-

ff tion wise a simple construction of the latch body

allowed.

fi According to the invention, the above object is achieved in that

the second mating part has tooth flanks, one of which runs at a more acute angle to the radius than the rindere and that each arm has essentially the same cross-section over its entire length and with a manual adjustment of the pawl body by means of the time switch part in one or the other

,] bends in the other direction of rotation in a resilient manner.

j 20 The arm itself forms the spring over its length

elastic element that puts the finger into

") zahnung presses. It bends when turning the time ·· ^

switching part in one direction or the other so that the finger comes out of the internal teeth. 25 cross-sectional tapering of the arm is unnecessary.

The arm retains its functionality even with relatively large tolerances in its cross-section. Through the

I Asymmetry of the tooth flank pairing is achieved that

I for rotating the timer part in one direction

i, 30 only exceeds a much smaller section modulus.

, - tr · '·, M Il (I ···· IP

must be wound than for turning in the other direction. The larger the ViderStandstoment also greater than the drive torque to be necessarily transmitted from the drive part to the time switch part. j

The second mating part is preferably formed by the finger. So the finger shows a tooth

, flank on that is at a more acute angle to the radius |

of the ring runs as the other. In this case |

are the tooth flanks of the internal toothing of the ring!

symmetrical to the radius. ■

In an embodiment of the invention, each \ arm extends in the unloaded state on a chord of the ^ring; straight forward. As a result, the arm can be designed to be simple and long in structure.

In a further embodiment of the invention are on. Latch body provided three arms resting on one

equilateral triangle. This arrangement is more favorable ( in terms of the forces involved

as a possible design with two or

four arms.
25th

Further advantageous embodiments of the invention

result from the following description of a

Embodiment and the subclaims «In the

Drawing show:

I I ■ ·

til i '

Figure 1 is a view of a directional lock and a timer

Figure 2 is an enlarged partial view.

A ring 1 of a directional gas barrier of a time switch has internal teeth 2. The ring 1 is driven by means of a clockwork mechanism, not shown in detail. Coaxial with the ring 1 is a pawl body 3 mounted _t which is rotationally fixedly connected to a not-shown timer part having a time slice or a time-ring and this time associated with switching members.

The diameter of the ring 1 is now 15. The tooth flanks 2 * and 2 * 'are symmetrical to the radius R _0. They are at an angle of 60 _t to each other, whereby they each form an angle of 30 ° with the radius R.

Three arms 4, 5 and 6 are formed on the latch body 3 ψ which lie in the plane of the ring 1. The arms 4, 5 and 6 carry fingers 7, 8 and 9 at their free ends. The transition areas 10 between the fingers 7 »8 and 9 and the arms 4, 5 and 6 are essentially rigid. The arms 4 _t 5 and 6 (see Figure 1.) Are in the unloaded state rectilinear. They run on tendons of ring 1 , which form an equilateral triangle. The arms 4, 5 and 6 form with the one running through the finger 7 »8 and» 9, respectively

Radius R an acute angle of about 45 °.

The arm k, the arm 5 and the arm 6 are respectively

connected to the clit body 3 via projections 11. The projections 11 extend from the latch body 3 against the respective fingers 7, 8 and 9. As a result, the length of the arms k, 5 and 6 is great. The projections 11 and the transition areas 12, in which they merge into the arms k, 5 and 6, are rigid.

The arm k , 5 or 6 running between the transition regions 10, 12 has the same cross section over its entire length, apart from tolerances. The cross section is dimensioned so that the arm k, 5 or 6 is resilient.

The finger 7 _f 8 or 9 has tooth flanks 13 and 14 engaging in the toothing 2. The tooth flank faces away from the associated arm k, 5 or 6. The tooth flank 14 faces him. The tooth flank 13 forms an acute angle WI with the radius R. The tooth flank Ik forms an acute angle W2 with the radius R. The angle W1 is larger than the angle W2.

The tooth flanks 13 and Ik are at the (/ angle WI + W2. The angle WI is slightly smaller than

half the angle formed by the tooth flanks 2 'and 2 ¹¹ . It is, for example, 25 °. The angle W2 is considerably smaller than the angle of the tooth flanks 2 ^! and 2 ^lf . It is, for example, 20 ° (see FIG. 2).

The tips of the teeth 7 »8 and 9 are offset from one another by 120 °. To a muted

f> lilt I ti iiiiintttt

I I IHi ■ ·

Il 1 1 ■ 1 1 111 «·

■ · r <■ ■

To achieve locking, the internal toothing 2 is designed so that not all three tooth tips ^{stand up on the ground between two tooth flanks 2 1} and 2 * 'at the same time. For example, the internal toothing has 88 teeth for this purpose.

The puncture method of the described locking mechanism is something like this

If the ring 1 rotates in its drive direction A, then tooth flanks 2 ¹ strike against the tooth flanks 13 of the fingers 7, 8 and 9. The ring 1 takes along the timer via the arms 4, 5 and 6 of the pawl body 3. Since the angle V1 is relatively large, sufficiently large forces can be transmitted to the timer via the ring 1 to drive the timer. The forces transmitted in the process mainly form a pressure load on the arms 4, 5 and 6, against which they are stable.

20th

If the time switch part and thus the pawl body 'is rotated in the adjustment direction V, the teeth arrive

flank 14 of fingers 7, 8 and 9. the tooth flanks 2 ¹¹ . Since this tooth flank pairing is relatively flat to the arm 4, 5 »6, the tooth flanks 14 slide along the tooth flanks 2 ··, the arms k, 5 and 6 bending convexly when seen from the outside. The fingers 7, 8 and 9 ratchet over the teeth 2. Since the angle W2 is relatively small, the force required to turn the timer part in the direction V is

• * * 8th

Il I f {I I> ·· O > · ■ If i

III i III a

If I Ii

ItIt a a a

H Il II I It

I · · · 4 «II / ■■ I

accordingly small. When the rotation is ended, the fingers 7 >> 8 and 9 engage with the internal toothing under the restoring force of the arms k _t 5 and 6

If the time switch part and thus the pawl body are rotated in the opposite direction G, the tooth flanks come to rest on the tooth flanks 2 '. The arms k, 5 and 6 are compressed and bend concave over part of their length when viewed from the outside. Since the angle W1 is relatively large, the tooth flank pairing 13t 2 · opposes the rotation in direction G with a significantly greater resistance torque than with a rotation in direction V. When this resistance torque is overcome, the tooth flanks slide along the tooth flanks 2 ¹ , so that the Ratchet fingers 7, 8 and 9 over the internal teeth 2. When the rotation is ended, the fingers 7 »8 and 9 again grip the internal toothing 2 under the restoring force of the arms k _t 5 and 6. Because the time switch part is more difficult to rotate in direction G compared to direction V, the user is prevented from turning the time switch part preferably in direction G.

Claims (1)

Expectations 1. Directional lock for a time switch, via which a drive part drives a Zeitijcraltteil, which compared to the drive part in one direction of rotation against a greater moment of resistance than in the other ren direction of rotation is manually adjustable, whereby the Directional lock one coupled to the drive part C) Ring with internal teeth and a non-rotatable with the Timing part connected to the ring coaxial latch body with at least two arms lying in the plane of the ring, which with a finger in radial direction spring-elastic grip into the internal toothing, which is pressed out of the internal toothing during an adjustment in one or the other direction of rotation, wherein in the pairing consisting of the internal toothing and the finger on the first pairing part angularly symmetrical tooth flanks to the radius of the ring are provided, characterized in that, that the second pairing part (7, 8, 9 "2") has tooth flanks (13, 1 ^ 1 2 ", 2 "), one of which (i4; 2 ¹ ') at a more acute angle (W2) to the radius (r) runs than the other and that each arm (k _t 5, 6) has essentially the same cross-section over its entire length and is resiliently resilient in one or the other direction of rotation (v, G) when the pawl body (3) is manually adjusted by means of the time switch part bends. ... 10 2. Directional barrier according to claim 1, characterized marked | ₍ draws that the second mating part from the fingers (7e 8, 9) is formed. 5 3 · directional barrier according to claim 1 or 2, characterized I. characterized in that a "transition area (io) between the arm (4, 5, 6) and the finger (7t 8, 9) rigid in the ^{h is} compared to the flexibility of the arm (4, 5, C) . 4. directional barrier according to one of the preceding claims, characterized in that each Arm (4, 5 »6) extends in a straight line on a chord of the ring (i) in the unloaded state. 5 «directional lock according to one of the preceding claims, characterized in that on the latch body (3) three arms (4, 5, 6) are provided which lie on an equilateral triangle. 6. Directional lock according to one of the preceding Claims, characterized in that each arm ^ ( ¹ ^ t 5, 6) on his finger (7, 8, 9) facing away The end merges into a projection (11) of the left-hand body (3) that is rigid opposite the arm (4, 5, 6), wherein the projection (ii) against the Finger (7, 8, 9) carrying end of the arm (4, 5, 6) extends. 7. Directional lock according to one of the preceding Claims 2 to 6, characterized in that the i I ii * i - 11 - The tooth flank (i4) facing the arm (kf 5 »6) is at a more acute angle (W2) to the radius (r) than the tooth flank (13) facing away from the arm (k ^ 5» 6) * 8. directional lock according to one of the preceding claims, characterized in that at an angle of 60 ° of the tooth flanks (2 ^f _t 2 ^{! L} ) of the first pairing part (2) of the more acute angle (W2) of the second pairing part (7, 8, 9 ) about 20 and the more obtuse angle (W1) about 25 °. 9. Directional barrier according to one of the preceding claims, characterized in that the mating parts (2; 7, 8, 9) are offset from one another by a fraction of a tooth pitch. 10. Directional barrier according to one of the preceding claims, characterized in that the arm (k, 5 »6) forms an acute angle with the radius (r) extending through the finger (7, 8, 9).