Title:
DOOR LOCK, ESPECIALLY FOR MOTOR VEHICLE DOORS
United States Patent 3848910


Abstract:
A locking mechanism for doors or the like, especially for motor vehicle doors which contains a latching element engaging during the closing of the door in a closure member; the closed position of the latching element is locked by a locking pawl which is disengageable from the latching element by a disengaging lever; a safety lever is coordinated to the latching pawl for purposes of blocking its disengaging movement or interrupting its connection while a forced locking lever is connected with the safety lever and includes a part following the latching pawl during actuation of the safety lever.



Inventors:
Wilfert, Karl (Gerlingen-Waldstadt, DT)
Gmeiner, Gunter (Sindelfingen, DT)
Grabner, Christian (Maichingen, DT)
Nockemann, Ernst (Wuppertal, DT)
Application Number:
05/299276
Publication Date:
11/19/1974
Filing Date:
10/20/1972
Assignee:
FA BOMORO BOCKLENBERG & MOTTE GMBH & CO KG,DT
DAIMLER BENZ AG,DT
Primary Class:
Other Classes:
292/DIG.26
International Classes:
E05B85/24; (IPC1-7): E05C3/26
Field of Search:
292/216,280,DIG.26
View Patent Images:
US Patent References:
3697105LATCH FOR VEHICLE DOORS1972-10-10Marx
3695663CLOSURE LATCH1972-10-03Cockburn



Primary Examiner:
Moore, Richard E.
Attorney, Agent or Firm:
Craig & Antonelli
Claims:
We claim

1. A lock for doors and the like comprising:

2. A lock with a rotatable latching means according to claim 1, characterized in that the locking lever means includes a nose portion which is movable approximately radially to the pivot axis of the rotatable latching means and in that an abutment of the locking pawl means is coordinated to said nose portion.

3. A lock according to claim 2, characterized in that the locking lever means is operatively connected with the latching means by way of a follower means and is guided in a guide means which permits its locking movement only in an end position corresponding to the end position of the latching means.

4. A lock according to claim 3, characterized in that the locking lever means is pivotally supported about a pivot axis which is displaceable together with the locking lever means approximately radially to the pivot axis of the latching means.

5. A lock according to claim 4, characterized in that the locking lever means is guided at a fixed member by means of control cam means substantially concentric to its pivot axis, said control cam means being provided with a radial aperture at its end abutting at the fixed member in the end position thereof corresponding to the locked position of the latching means.

6. A lock according to claim 5, characterized in that the control cam means of the locking lever means is provided with a further substantially radial aperture at its end abutting at the fixed member in the end position corresponding to the open position of the latching means.

7. A lock according to claim 6, characterized in that the safety lever means is operatively connected with at least one of the two parts consisting of disengaging lever means and locking pawl means by at least one intermediate lever means which carries eccentrically to its pivot axis the pivot axis of the locking lever means.

8. A lock according to claim 6, characterized in that the safety lever means is operatively connected with at least one of the two parts consisting of disengaging lever means and locking pawl means by several intermediate lever means, of which one carries eccentrically to its own pivot axis the pivot pin of the locking lever means.

9. A lock according to claim 7, characterized in that the locking lever means is spring-loaded with a spring in the direction of the closure movement of the latching means and includes a control edge by means of which it abuts at a fixed member of the latching means.

10. A lock according to claim 9, characterized in that at least the lever means held in their closing position by spring stress are constructed as two-armed levers whose center of gravity is disposed approximately in the respective pivot axis.

11. A lock according to claim 10, characterized in that all lever means are constructed as two-armed levers whose center of gravity is disposed approximately in a respective pivot axis.

12. A lock according to claim 10, characterized in that the lock is for a motor vehicle door and in that the latching means, the locking lever means and the locking pawl means are secured at the door.

13. A lock according to claim 1, characterized in that the locking lever means is operatively connected with the latching means by way of a follower means and is guided in a guide means which permits its locking movement only in an end position corresponding to the end position of the latching means.

14. A lock according to claim 13, characterized in that the locking lever means is pivotally supported about a pivot axis which is displaceable together with the locking lever means approximately radially to the pivot axis of the latching means.

15. A lock according to claim 13, characterized in that the locking lever means is guided at a fixed member by means of control cam means substantially concentric to its pivot axis, said control cam means being provided with a radial aperture at its end abutting at the fixed member in the end position thereof corresponding to the locked position of the latching means.

16. A lock according to claim 15, characterized in that the control cam means of the locking lever means is provided with a further substantially radial aperture at its end abutting at the fixed member in the end position corresponding to the open position of the latching means.

17. A lock according to claim 1, characterized in that the locking lever means is pivotally supported about a pivot axis which is displaceable together with the locking lever means approximately radially to the pivot axis of the latching means.

18. A lock according to claim 1, characterized in that the locking lever means is guided at a fixed member by means of control cam means substantially concentric to its pivot axis, said control cam means being provided with a radial aperture at its end abutting at the fixed member in the end position thereof corresponding to the locked position of the latching means.

19. A lock according to claim 18, characterized in that the control cam means of the locking lever means is provided with a further substantially radial aperture at its end abutting at the fixed member in the end position corresponding to the open position of the latching means.

20. A lock according to claim 1, characterized in that the safety lever means is operatively connected with at least one of the two parts consisting of disengaging lever means and locking pawl means by at least one intermediate lever means which carries eccentrically to its pivot axis the pivot axis of the locking lever means.

21. A lock according to claim 1, characterized in that the safety lever means is operatively connected with at least one of the two parts consisting of disengaging lever means and locking pawl means by several intermediate lever means, of which one carries eccentrically to its own pivot axis the pivot pin of the locking lever means.

22. A lock according to claim 1, characterized in that the locking lever means is spring-loaded with a spring in the direction of the closure movement of the latching means and includes a control edge by means of which it abuts at a fixed member of the latching means.

23. A lock according to claim 1, characterized in that at least the lever means held in their closing position by spring stress are constructed as two-armed levers whose center of gravity is disposed approximately in the respective pivot axis.

24. A lock according to claim 23, characterized in that all lever means are constructed as two-armed levers whose center of gravity is disposed approximately in a respective pivot axis.

25. A lock according to claim 1, characterized in that the lock is for a motor vehicle door and in that the latching means, the locking lever means and the locking pawl means are secured at the door.

26. A lock according to claim 1, wherein said safety lever means prevents disengagement of said locking pawl means from said latching means.

27. A lock according to claim 1, wherein said safety lever means prevents interuption of the operative connection between said disengaging lever means and said locking pawl means.

Description:
The present invention relates to a lock for doors or the like, especially for motor vehicle doors, which includes a locking or latching element engaging during the closing into a closure part of the lock mechanism, the locked position of the locking or latching element being ensured by a locking pawl which is disengageable from the locking element by a disengaging lever, to which is coordinated a safety lever for blocking the disengaging movement or for the interruption of its connection to the locking pawl.

In the known types of constructions of door locks, there exists the danger that the locking pawl which is spring-loaded by means of a spring, does not assume accurately its locking position, even though the door is completely closed and the locking element has reached its end position. The locking pawl which, for the most part has to engage with a projection or nose portion thereof behind a detent of the locking or latching element, then offers only an inadequate protection against a sudden opening of the lock. This is very dangerous in particular with the use of such a lock in motor vehicle doors because, in that case, the great danger exists that the doors open automatically already at a relatively slight impact of the vehicle as a result of an accident. In order to obviate these difficulties, it is already known in the prior art to so construct the safety lever that it can be determined by a safety or locking test whether the locking pawl has assumed its prescribed position. This measure, however, is not sufficient because the position of the locking pawl in this type of construction can be changed only in that the door is opened anew and then closed again. Thereafter, the danger continues to exist that also after the repeated closing, the locking pawl gets stuck at the same place without ever reaching its end position necessary for safety reasons.

The present invention is concerned with the task to so construct a lock of the aforementioned type that the locking pawl can be brought into its prescribed end position with an accurately closed door or the like without renewed opening of the lock. The present invention essentially consists in that a forced locking lever, i.e., a checking lever forcibly actuated, is connected with the safety lever, which includes a portion following the latching pawl during the actuation of the safety lever. It is achieved by this construction that the locking or latching pawl is forcibly brought into its prescribed end position with an accurately closed door or the like, i.e., when the locking element has reached its end position. The term "forced locking lever" is used herein to describe the checking lever of the present invention which is forcibly actuated by the mechanism.

In one appropriate embodiment of the present invention, the forced locking lever is provided with a nose portion which is movable approximately radially to an axis of rotation of a rotatable locking or latching element and to which is coordinated an extension of the locking pawl. As a result of this construction, a radial coordination of the locking pawl to the locking element is possible.

Provision is made according to a further feature of the present invention that the forced locking lever is coupled with the locking or latching element by means of a follower connection and is guided in a guide means which permits its locking movement only in one end position corresponding to the end position of the locking element. It becomes possible by this construction to examine with the aid of a safety or locking test whether the door or like is accurately closed, i.e., whether the locking or latching element has assumed its prescribed end position since only in this position a locking is possible with a simultaneously forcibly or necessarily following, complete engagement of the locking pawl.

In an appropriate embodiment of the present invention, the forced locking lever is pivotal about an axis of rotation which is displaceable together with the forced locking lever approximately radially to the axis of rotation of the locking or latching element. In this embodiment, the movement taking place together with the movement of the locking element is separated from the forced locking movement. It is structurally advantageous if the forced locking lever is guided at a fixed pin or the like by means of a template or cam surface concentric to its axis of rotation, which is provided with a radial aperture at its end abutting at the pin or the like in the end position corresponding to the closed position of the locking element. In this embodiment of the present invention, it is not possible to actuate the safety lever as long as the locking or latching element has not assumed its end position since the locking movement is possible only within the area of the radial aperture.

In order to achieve that the safety lever can be actuated also with an opened door or the like, provision is made according to a further feature of the present invention that the template or cam surface of the forced locking lever is provided with a further radial aperture at the end thereof abutting at the pin or the like in the end position corresponding to the opened position of the locking or latching element. This construction permits an actuation of the safety lever with an opened door without thereby causing a movement of the locking pawl by the forced locking lever.

A structurally advantageous construction of the present invention is obtained if the safety lever is connected with the disengaging lever and/or the locking pawl by means of one or several intermediate levers, of which one carries eccentrically to its axis of rotation the pivot axis of the forced locking lever. The displacement movement of the axis of rotation of the forced locking lever, necessary for the forced locking action, can be attained in a simple manner by this arrangement.

In order to provide a structurally favorable follower connection between the forced locking lever and the locking or latching element, in one advantageous embodiment of the present invention, the forced locking lever is spring-loaded with a spring in the direction of the closing movement of the locking or latching element and includes a control edge, by means of which it abuts at a pin or the like of the locking or latching element. With this construction, the forced locking lever automatically senses whether the locking or latching element has or has not assumed its accurate closure or locking position.

In a further development of the present invention, provision is made that all levers or at least the levers retained in the closed or locked position by spring stress are constructed as two-armed levers whose center of gravity is disposed respectively approximately in the axis of rotation thereof. A mass equalization of the movable parts is created thereby so that also at high decelerations which may occur as a result of an accident, no moments act on the levers which could effect an automatic opening of the door or the like. In order to achieve the mass equalization, it is necessary under certain circumstances to mount or attach additional masses at the intermediate levers and/or to reduce the masses by bores or the like.

Accordingly, it is an object of the present invention to provide a lock for doors, especially for motor vehicle doors which avoids by simple means the aforementioned shortcomings and drawbacks encountered in the prior art constructions.

Another object of the present invention resides in a door lock, especially for motor vehicles, in which the danger of an inadvertent opening of the door is far-reachingly minimized.

A further object of the present invention resides in a door lock for motor vehicles in which the likelihood of a door that opens as a result of decelerations or forces occurring in an accident, is obviated.

A still further object of the present invention resides in a door lock for motor vehicle doors in which the locking pawl can be brought into its prescribed end position without renewed opening of the lock and door.

Another object of the present invention resides in a door lock for motor vehicles which is simple in construction, requires relatively few additional parts, and offers great safety against inadvertent opening of the door.

These and further objects, features and advantages of the present invention will become more apparent from the following description when taken in connection with the accompanying drawing which shows, for purposes of illustration only, one embodiment in accordance with the present invention, and wherein:

FIG. 1 is an elevational view of a tap lock constructed according to the present invention in its closed position;

FIG. 2 is a cross-sectional view taken along line II--II of FIG. 1;

FIG. 3 is an elevational view of the tap lock of FIG. 1 in the closed position and with engaged safety mechanisms;

FIG. 4 is a cross-sectional view, taken along line IV--IV of FIG. 3;

FIG. 5 is an elevational view of the tap lock in accordance with the present invention in an intermediate position; and

FIG. 6 is an elevational view of the tap lock in accordance with the present invention in the opened end position.

Referring now to the drawing wherein like reference numerals are used throughout the various views to designate like parts, there is illustrated in the various figures of the drawing that part of a tap lock or pin-type lock which is secured in a motor vehicle door. It consists of a housing 1 which is provided with an aperture or recess 2 (FIGS. 2 and 4) in which is arranged a conical pin 3. By means of this conical pin 3, the lock is engaged during the closing of the door in a closure or female member in the form of an eye or lug (not shown) of conventional type which is secured at the body, for example, at a door column. The eye or lug of the lock mechanism is additionally provided with two bolts (not shown) disposed transversely to its bore, as is known in the art, into which engages during the closing a rotary latch 4 serving as locking element and provided with teeth generally designated by reference numeral 5. The rotary latch 4 projecting into the aperture 2 of the housing 1 engages with its teeth 5 the bolts of the closure lug, by means of which it is rotated about its pivot pin 6 with the complete closing of the door from the position illustrated in FIG. 6 into the end position illustrated in FIG. 1. In this latter end position, the rotary latch 4 is secured or held fast by a locking pawl generally designated by reference numeral 7 which is pivotally secured at the housing 1 about a pivot pin 8. The locking pawl 7 engages in the closed or locked position with a nose or cam portion 9 thereof into a main detent 10 of the rotary latch 4. In addition to the main detent 10, a pre-detent 11 is additionally provided at the rotary latch 4 into which engages the cam portion 9 of the locking pawl 7 if only the first part of the teeth 5 of the rotary latch 4 engages with the corresponding bolts of the closure lug (not illustrated) as shown in the position illustrated in FIG. 5. The locking pawl 7 is displaced together with its cam or shoulder portion 9 toward the rotary latch 4 by a draw-spring 12 whose other spring end is secured at an extension of the housing 1.

The cam or nose portion 9 of the locking pawl 7 is adapted to be pivoted away from the circumference of the rotary latch 4 against the effect of the draw-spring 12 by means of a disengaging lever generally designated by reference numeral 13 which is pivotally secured at the housing 1 about a pivot pin 14. A bolt 15 (FIG. 1) serves for purposes of connecting the disengaging lever 13 and the locking pawl 7 which are arranged in different planes, whereby the bolt 15 is disposed perpendicular to these planes. The bolt 15 is carried by an intermediate lever 16 (FIG. 1) which is pivotally supported in a further intermediate lever 17 approximately above the pivot pin 14 of the disengaging lever 13. The intermediate lever 17 is pivotally secured at the housing 1 about a pivot pin 18. The bolt 15 is guided in a slot guidance 19 of the disengaging lever 13. If the intermediate lever 17 is rotated in the clockwise direction, then the bolt 15 travels in the slot guidance 19 of the disengaging lever 13 in the downward direction as viewed in the drawing, whereby the connection between the disengaging lever 13 and the locking pawl 7 is interrupted. The locking pawl 7 is thereafter not actuatable by the disengaging lever 13 so that it is held constantly in the locked position by the draw-spring 12.

The rotary latch 4, the locking pawl 7, the disengaging lever 13 and the intermediate levers 16 and 17 are all disposed in parallel planes so that also their pivot axes 6, 8, 14 and 18 extend parallel to one another. These planes are so selected and the levers are in part additionally cranked or offset in such a manner that they do not mutually interfere with one another.

The intermediate lever 17 is pivotal about its pivot axis 18 by means of a safety lever generally designated by reference numeral 20 (FIGS. 2 and 4). The safety lever 20 is disposed in a plane which extends perpendicularly to the planes, in which are disposed the remaining levers. As shown in FIG. 2, the safety lever 20 is pivotally secured at the housing 1 by means of a pivot pin 21, whereby the pivot pin 21 is disposed parallel to the pin 3 of the lock. A dead-center point spring 22 is mounted between the safety lever 20 and the housing 1 so that the safety lever 20 is pivotal only into two end positions in which the pin 15 of the intermediate lever 16 is disposed either in the position between the free end of the locking pawl 7 and the slot guidance 19 of the disengaging lever 13 as shown in FIG. 1, or is disposed, moved outside of the pivot area of the locking pawl 7, displaced downwardly within the slot guidance 19 of the disengaging lever 13. The safety lever 20 is provided with two extensions 23 and 24 mutually offset by 90° . Either a knob (not shown) vertically movable up or down in the direction of the double arrow 25 (FIG. 2) is connected with the extensions 23 or a horizontally to and fro movable linkage (not shown) is connected with the extension 24. The linkage, in its turn, is again adjustable by way of a vertically reciprocable knob. The safety lever 20 is additionally actuatable by means of a key which engages by way of a cylinder lock or the like in a conventional tumbler 26 that is rotatably supported in the housing 1. A pin 27 is secured at the tumbler 26 which engages in a slot guidance 28 of the safety lever 20 and is able to take along the intermediate lever 17. For that purpose, the intermediate lever 17 extends with its free end through an aperture 29 of the safety lever 20.

A forced locking lever generally designated by reference numeral 31 is additionally pivotally secured at the intermediate lever 17 eccentrically to its pivot pin 18 about a pivot pin 30. The forced locking lever 31 is displaceable together with this pivot pin 30 approximately radially to the pivot pin 6 of the rotary latch 4 by pivoting the intermediate lever 17 by way of the safety lever 20. The pivoting of the forced locking lever 31 about its pivot axis 30 takes place in dependence on the movement of the rotary latch 4. For that purpose, a follower connection is provided between these two parts. The rotary latch 4 is provided with a pin 33 extending through a slot 32 of the housing 1, which additionally serves for the mounting of the draw-spring 34 whose other end is suspended in the disengaging lever 13 and whose force serves as return force for returning the rotary latch 4 into its opened position. A control edge 35 of the forced locking lever 31 is coordinated to the pin 33. Additionally, the forced locking lever 31 includes a template or cam surface 36 whose edge extending concentrically to the pivot pin 30 is guided at a pin 37 that is fixedly mounted at the stationary housing 1 so as to be immovable. Apertures 38 and 39 extending radially to the pivot pin 30 of the forced locking lever 31 adjoin the template or cam surface 36 at both ends thereof. The forced locking lever 31 and the intermediate lever 17 are provided with extensions 40 and 41 into which is suspended a draw-spring 42 which spring-loads the forced locking lever 31 in the direction toward the pin 33.

When the illustrated pin-type lock is closed, then the rotary latch 4 is brought into its closing position illustrated in FIG. 1. The pin 33 thereby moves from the position illustrated in FIG. 6 into the position illustrated in FIG. 1. The forced locking lever 31 follows the pin 33 by reason of the effect of the draw-spring 42. The end of its movement is determined by the end of the template or control cam 36 which, as illustrated in FIG. 1, abuts at the fixed pin 37 whereupon the pin 33 is lifted off from the control edge 35. It is possible in this end position to move the safety lever 20 with the aid of its knob or the like since the pin 37 can enter the aperture 39 if the intermediate lever 17 and therewith also the forced locking lever 31 are lifted, with the forced locking lever 31 being thereby displaced approximately radially to the pivot pin 6 of the rotary latch 4. A locking nose portion 43 is provided at the forced locking lever 31 within the area of the locking pawl 7, which is coordinated to an abutment 44 of the locking pawl 7 extended beyond the cam 9. The locking nose portion 43 moves during the pivoting of the forced locking lever 31 in the direction toward the abutment 44 of the locking pawl 7 and moves the same with its cam 9 so far until it reaches its end position predetermined by the main detent 10. This type of forced or positive guidance is possible only in the end position illustrated in FIGS. 1 and 3 since both the length of the locking nose portion 43 as also the length of the abutment 44 are limited.

As illustrated in FIG. 5, it is additionally not possible to actuate the safety lever 20 in intermediate positions since in that case the pin 37 abuts at the portion of the cam surface or template 36 of the formed locking lever 31 which is concentric to the pivot pin 30 and prevents the pivoting of the intermediate lever 17. This is, for example, the case when the cam 9 of the locking pawl 7 engages with an incorrectly closed door in the pre-detent 11 of the rotary latch 4 which is engaged only with its first part of its teeth 5 in one of the bolts of the closure lug. In this case, the safety locking action of the lock cannot take place which is a reliable indication that the door has not been closed completely since the rotary latch 4 has not yet reached its closing or locking position.

The aperture 38 at the end of the control cam or template 36 of the forced locking lever 31 serves the purpose that the lock can be locked by actuation of the safety lever 20 by way of a knob or the like also with an opened door or with an opened lock whereby the locking remains preserved after the closing of the door. As illustrated in FIG. 6, the pin 37 engages in the aperture 38 when the safety lever 20 is actuated in the opened position of the locking element, i.e., of the rotary latch 4 illustrated in FIG. 6. In this case, no forced locking of the locking pawl 7 takes place by means of the rotary latch 4 since the locking nose portion 43 and the abutment 44 of the locking pawl 7 cannot come in contact with one another. This, however, is of lesser significance since this type of door closing in motor vehicles is used as a rule only when the passengers leave the parked vehicle. The positive or forced locking can be repeated even subsequently without opening of the door in that the safety lever 20 is at first disengaged and thereupon re-engaged. By reason of the action of the draw-spring 42, the forced locking lever 31 moves during this operation into the end position illustrated in FIG. 1, which corresponds also to the closing position of the rotary latch 4. With a renewed engagement of the safety locking mechanism, the pin 37 then engages in the aperture 39 whereby the locking nose portion 43 moves toward the abutment 44 and displaces the locking pawl 7 which possibly is not completely engaged, into its end position.

If it is to be avoided with certainty that the driver can lock himself out of his vehicle by actuation of the safety locking means prior to the closing of the door, then one dispenses in a simple manner with the aperture 38 in the forced locking lever 31 so that the concentric part of the control cam or template 36 continues within this area. The safety lever 20 is then actuatable only in the closed position. This construction as a rule is offered for the lock of the driver door of a motor vehicle.

The type of construction of the lock mechanism described hereinabove is advantageously applicable also to other types of lock construction. It is thereby possible without difficulty to utilize other locking or latching elements, for example, star-type or spider-type locking or latching elements or the like which may also possess different movements during the closing. It is additionally possible to provide a connection between the locking pawl and the disengaging lever which are not uncoupled or disengaged by engagement of the safety locking means but are blocked thereby. The construction of the lock according to the present invention additionally offers the advantage with use in motor vehicle doors that the danger of an automatic opening as a result of high decelerations occurring in an accident is far-reachingly precluded. This is in part due to the fact that the forced locking lever 31 with its locking nose portion 43 additionally locks the locking pawl 7 whereas, in its turn, it is secured or locked at the pin 37 in the aperture 39 within the control cam or template 36. Therebeyond, it is quite feasible in an embodiment according to the present invention to construct the levers all, constructed as double-armed levers, by a corresponding dimensioning or by the mounting of additional weights or the like in such a manner that their center of gravity is located at least approximately in their respective pivot axes so that also in case of high decelerations, no angular momentum or torque can occur which displaces the levers out of their closing or locking positions.

While we have shown and described only one embodiment in accordance with the present invention, it is understood that the same is not limited thereto but is susceptible of numerous changes and modifications as known to those skilled in the art, and we therefore do not wish to be limited to the details shown and described herein but intend to cover all such changes and modifications as are encompassed by the scope of the appended claims.