DE2433011A1 - LEVER OPERATED LOCK - Google Patents

Description

Ht? Rne, 8000 fiunciien 40,

Freillgralhstraßo 19 r> i «ll« «C» UIQ «l, ^ tlsenachor Strasse 17

DIpL-Ing. RH Bahr _Pat . _{AriV /} .

^: PaU-Anw. Herrmann-Trsntepohl D ί DL ~ PHV S. EUUBTU B θ t Z ! 6 Γ Phone: 35 00 11

Telephone: 51013 "* * * 26 3012

⁵¹⁰¹⁴ Dip! - Sng. W. Herrmann-Trentepoh! ^ ³⁰¹³

Tetogram address: ^ Telegram address:

Bshrpatonte Horno PATE NTaNWAL IE Babotzpat Münchon

Telex 08 22S 853 Τβ! Βχ5215360

Γ ~~ \ Bank accounts:

Bayerische Verolnsbank Munich S52 Dresdner Bank AG Herne 7-520 459 "? L- " ■? ^ Π Ί 1 postal check account Dortmund 558 60-457

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M 4819 E / st

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Munich

Multi-Stroke Handbrake Controls Limited Green Lane,

Tewkesbury, Gloxacestershire ■ England

Lever operated lock

The invention relates to a lever-operated lock, in which the to-and-fro movement of the lever affects the ratchet wheel associated drum or the like operated. Devices of this type are commonly used for tensioning brake cables the parking brakes of vehicles, especially the brakes of semi-trailer or independent trailers, and the The invention relates in particular to a so-called multi-stage Handbrake of this type. It will be understood that although such devices normally operate via cables, they do can also be replaced by suitable other flexible links, for example chains, and hence the term "cable drum" should only be regarded as an example of such drums.

Multi-stroke hand brakes usually have a ratchet wheel, which forms one side plate of the cable drum and of a spring-loaded holding pawl detected and

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is actuated by a spring-loaded insert pawl which is mounted on an actuating lever, the axis of which with the axis of the ratchet wheel is common. After extensive use, the pawls wear out and need to be replaced. task the present invention is to significantly increase the life of such pawls.

In accordance with the present invention there is a lever operated lockout Holding and insert pawls with different surface parts that engage with the ratchet wheel in this way stand that the pawls can be replaced, so that always fresh surface parts for engagement with the ratchet wheel be available. Thus, the effective life of the pawls is doubled or multiplied and the pawls are preferably identically but arranged differently, depending on whether they have the holding or drive or insert function have to take over.

Preferably, the pawls have surface portions which are in engagement with one another when the lever is not fully engaged driven or freewheeling direction is moved, the engagement moves both pawls into a released position and holds them there with respect to the ratchet wheel. The training of the latches is desirably such that the engagement of the pawls brings various engagement surface parts into play, see above that changing over the pawls renews all effective surfaces and preferably a protruding part of a pawl engages with a recessed part of the other pawl. The mutual engagement of the pawls is used desirably of limiting the movement of the lever in the non-driving direction, so that the creation of an ordinary Stop is unnecessary for this purpose.

- 3 "-409885/1047

Torsion springs that bring the pawls into engagement with the ratchet wheel, preferably have spring arms with different Stop points come into engagement, which are arranged so that the correct spring loading for the pawls is in place, for this purpose the profile of each Pawl provides two specific spring stop points that are detected accordingly in the holding and operating position of the pawl are. This avoids drilling spring engagement holes in the latches, as was previously necessary.

The pawls consist of castings, fittings or equivalent machined steel rails or bands. However, they can also be produced by a sintering process, with one precise Molds and a specific material used, calculated to be highly effective and reasonably safe are guaranteed.

A locking mechanism according to the present invention for use in a multiple-stroke handbrake is intended below as an exemplary embodiment will be explained in more detail with reference to the drawings.

The drawings show in

1 is a front view of the locking mechanism ;

Fig. 2 is a partially sectioned plan view;

3 shows a corresponding vertical section through the ratchet wheel axle ; and in

4 shows a latch profile as used in accordance with the invention finds.

- 4 -409885/1047

A cable reel 1, one side of which is provided with a ratchet wheel, is rotatably mounted on a shaft 3 which extends between a flat, generally triangular back plate 4 in which the. Axis is attached, and a triangular cranked cover plate 5 extends which is attached to the back plate 4 by a pin which is free from the drum and fixed in a bore 7 in the back plate. An operating lever 8 with a rectangular cross-section and a generally circular flat inner end portion 9 is freely pivotable on the axis 3 between the back plate 4 and the ratchet wheel 2. A spring washer 10 between the outside 11 of the drum and the cover plate 5, which covers a sector of the drum, presses the drum "towards the back plate and against the lever end 9 and also creates a braking torque acting on the drum. A button head screw 18 runs through the cover plate 5 into the end of the axle 3

The pin 6 on which the Peckpüäbte 5 by a nut 12 is attached, is stepped so that a bearing surface for a holding pawl 13 is created, and is between this pawl 13 and the back plate 4 surrounded by a torsion spring 14, which the retaining pawl 13 in engagement with the ratchet wheel 12 presses. An insert pawl 15 is rotatably mounted and engaged on the lever 8 near the ratchet wheel 2 with the latter spring-loaded by a torsion spring 16 which surrounds a pin 17 on which the pawl is mounted.

The cranked part of the cover plate 5 extends, as one can see from Fig. 3 around the nut and has a tight play with respect to the adjacent side 11 of the drum on, i.e. the side facing away from the ratchet wheel, sov.de der

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adjacent side edge of the ratchet wheel. In any case, the margin is smaller than the diameter of the cable used, so that the latter cannot jam on the drum. The cover plate 5 has the dual function of prevention a jamming of the cable on the drum 1 and a contracting of the axis 3 and the retaining pawl pivot pin 6, which also forms a seat for the spring ring.

The two pawls 13 and 15 are sintered and identical, but use completely different effective edge surface parts, so that they can be swapped for a completely new set of surfaces in use to be able to take. The forra of one of the clinics should now be in each will be explained in more detail with reference to FIG. A lug 20 protrudes on each side of the pawl and acts as a spacer. It also has a central bearing bore 21. A toothed part 22 protrudes on one Side of the approach 20 in front and has a side tooth 23, which ensures engagement with the ratchet wheel, as well an insert tooth 24 for driving engagement. The tooth 24 forms one side of a V-shaped notch at a 90 ° angle ~ Dimensions.

The end part 25, which protrudes on the other side of the extension 20, has correspondingly inclined surfaces A and B, which enclose an obtuse angle of 136, which is also the re-entrant angle between that turned away from the attachment Side surface C of the retaining tooth 23 and the adjacent side surface D of the toothed part 22 is.

The pawls 13 and 15 are mounted on their pivot pins so that the toothed parts 22 both precede in the driving direction, wherein the design is chosen such that the one pawl

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is only reversed with respect to the other in order to put the corresponding tooth 24 or 23 into operation. The torsion spring 14 of the retaining pawl 13 has two legs 14a and I4b, of which the leg 14a is the edge of the back plate 4 and the leg I4b has a concave stop area 26 of the corresponding pawl near the shoulder 20 and on the edge of the toothed part 22 the other side to the retaining tooth 23 is detected. The insert pawl spring 16 has an end leg 16a in the form of a curved radial rail which is seated in a transverse slot in the corresponding pawl pin 17. The other leg 16b engages a concave stop area 27 on the drive pawl at the apex of the re-entrant angle of 136 on the toothed part 22. Thus, a different spring stop area is provided for each pawl position, with the correct spring force being obtained in each position. This is essential to the accurate effectiveness of the device.

A movement of the lever 8 in. Which is not the drive or freewheeling direction is limited by the engagement of pawls 13 and 15, the engagement serving to both pawls forward To release the ratchet wheel and thus also to reduce the cable tension, since the drum 1 is now generated by the spring ring 10 Braking torque is free. For this purpose, the end part of the insert pawl 15 engages in the tooth part of the retaining pawl, the 136 ° angle between the end surfaces A and B of the end portion of the drive pawl to the similar one however, recessed angle between the surface C of the retaining tooth and the adjacent side surface D of the retaining pawl fits. The design of the pawl surfaces is such that they engage with reciprocal cam action, whereby they turn them to the release position.

409886/10

The circular inner end 9 of the lever ,, which through Stamping or pressing can be made, provides a thrust bearing surface for the drum 1, which is in bearing contact with the adjacent side surface of the drum. The opposite side 11 of the drum is a recess on, in which a lubricant 31 is housed, which has a lubrication channel 32 parallel to the drum axis and feeds radially offset outwards by a bit, which is slightly smaller than the total radius of the circular end 9 of the lever is. This channel 32 opens into the outer end of a radial slot 33 in which the lever is in contact Side surface, this slot 33 extending radially inward to the central bore through which the Axis 3 leads. An axially directed slot 34 is in This bore is formed and extends over the full axial width of the drum from the inner end of the radial Slot 33. This results in a particularly advantageous lubrication arrangement, since a lubrication gun is attached at the same time dfe bearing surfaces of the ratchet wheel 2 with the end 9 of the operating lever and the axle bearings as well lubricates the frictional grinding surfaces on the spring ring 10. The lubricant pumped inward through this channel is forced to run radially along the radial slot, the through the. Bearing surface on the lever is closed, and then axially outward along the axis to the outer surface around the spring ring. At the same time the bearing of the lever on the axle is adequately lubricated.

Claims

409885/1047

Claims (8)

- 8 claims 1., Lever-operated lock with holding and insert inks, rch marked that the holding and Insert pawls have different surface parts that are in engagement with the ratchet wheel in such a way that the Pawls are interchangeable and thus new surface parts deliver for engagement with the KTinkrad. 2. locking mechanism according to claim 1, characterized in that that the holding and insert pawls are identical, but are arranged differently. J5. Lock according to claim 1 or 2, characterized in that the pawls have surface parts, which are in engagement with each other when the lever is fully moved in the non-drive or freewheel direction, wherein the engagement both moves the pawls into a disengaged state with respect to the ratchet wheel and holds them in that state. 4. locking mechanism according to claim 3, characterized in that the engagement of the pawls different engagement surface parts into the Spiej _f so that when changing the pawls a,! Le effective surfaces of the same are renewed. 5. locking mechanism according to claim 3 or 4, characterized in that a projecting part of a pawl ' combs with a recessed part of the other, 6. locking mechanism according to claim 3> 4 and / or 5, characterized in that a limitation of the lever movement is provided in the non-Antriebriehtung by cten engagement of the pawls. - 9 409885/1047 7. locking mechanism according to one or more of the preceding claims, characterized in that torsion springs press the pawls into engagement with the ratchet wheel and have spring arms which come into engagement with different stop points _f which are arranged such that the correct spring loading is present for the pawls , whereby the profile of each pawl has two specific spring stop points that are recorded accordingly in the holding or operating position of the pawl. 8. Lock after one or more eggs previous--.! Expectations, characterized in that the pawls using precise shapes through a sintering process are made. 409885/1047