The present disclosure relates to work truck doors and latches, and in particular to a security tether for a vehicle compartment door latch.
Conventional compartment door truck latches include a pivoting handle acting as a lever where moving it in one direction latches the door and moving in the opposite direction unlatches the door. The handle is attached to a latch shaft that is attached to a pawl that selectively engages or disengages a lock lever to lock or unlock the latch. Under normal circumstances, however, securement between the pawl and the lock lever is often not enough to prevent a forced engagement on the handle from unlatching the door. The combined resistance from the arm and latch is not, on its own, strong enough to withstand extreme forces and prevent failure. This obviously limits the effectiveness of this latching mechanism.
An illustrative embodiment of the present disclosure provides a security tether which engages a portion of the pivot shaft attached to the handle and latch mechanism so that a force applied to the handle is absorbed by the tether to prevent the locking function from failing. In an embodiment, the security tether withstands a typical forced engagement applied by a human arm. If a tool is used to pry the handle and shaft, the security tether may cause a failure different from the prior art and instead the handle and shaft strip-out. The security tether, however, keeps the panel and, thus, the latch in place. This means that a forced incursion using tools on the handle will now only cause the handle to break but not unlatch the door. Such an intentional failure mechanism creates an additional level of security.
Another illustrative embodiment of the present disclosure provides a vehicle that includes a door, handle, shaft, and a latch assembly. The latch assembly is coupled to the door to selectively secure the door. Further, the latch assembly includes: the handle being coupled to the shaft and configured to rotate the shaft about the shaft's longitudinal extent; a pawl is attached to the shaft and configured to move between latched and unlatched conditions when the shaft is rotated; a lock lever is movable between locked and unlocked conditions; when the lock lever is located in the locked condition, the lock lever engages the pawl at a first location so the pawl is prevented from moving to the unlatched condition; when in the unlocked condition, the lock lever is disengaged from the first location so the pawl is not prevented from moving to the unlatched condition; and a security tether configured to prevent the shaft from moving the pawl, when the lock lever is located in the locked condition. The security tether further includes: a plate attachable to the latch assembly; the plate includes an aperture sized to receive at least a portion of the lock lever that is disposed through the aperture; the plate includes first and second stop surfaces that limit movement of the lock lever; the first and second stop surfaces are also spaced apart from each other; the lock lever is movable between the first and second stop surfaces; at least the first stop surface is spaced apart from the first location on the pawl; and the lock lever engages the first stop surface when the lock lever is located in the locked condition to prevent the pawl from moving to the unlatched condition and unlatching the latch assembly.
In the above and other embodiments, the vehicle may further include: the lock lever engaging the first location on the pawl and the first stop surface to prevent the pawl from moving to the unlatched condition and unlatching the latch assembly; the first and second stop surfaces being non-parallel to a periphery surface of the aperture in the plate; the plate being attachable to the pin on the lock assembly; the plate does not move with respect to the pin or the lock lever; and the lock lever is movable by a lock cylinder that moves the lock lever about an axis.
Another illustrative embodiment of the present disclosure includes a vehicle that includes a door and a latch assembly. The latch assembly is coupled to the door to selectively secure the door. A first portion of the latch assembly is located on a first surface of the door and a second portion of the latch assembly is located on a second surface of the door. The first and second surfaces of the door are opposing sides of each other. The latch assembly also includes: a shaft disposed through the first and second surfaces of the door; the shaft being configured to rotate about its longitudinal extent; a pawl attached to the shaft and configured to move between latched and unlatched conditions when the shaft is rotated; a lock lever spaced apart from the latch assembly and movable between locked and unlocked conditions; when the lock lever is located in the locked condition the lock lever engages the pawl at a first location so the pawl is prevented from moving to the unlatched condition, and when in the unlocked condition, the lock lever is disengaged from the first location so the pawl is not prevented from moving to the unlatched condition; and a security tether configured to prevent the shaft from moving the pawl when the lock lever is located in the locked condition. The security tether includes: a plate attachable to the latch assembly; the plate includes an aperture sized to receive at least a portion of the lock lever that is disposed through the aperture; the plate further includes first and second stop surfaces to limit movement of the lock lever; the first and second stop surfaces are spaced apart from each other; the lock lever is movable between the first and second stop surfaces; at least the first stop surface is spaced apart from the first location on the pawl; and the lock lever engages the first stop surface when the lock lever is located in the locked condition to prevent the pawl from moving to the unlatched condition and unlatching the latch assembly.
In the above and other embodiments, the vehicle may further include: the lock lever engaging the first location on the pawl and the first stop surface to prevent the pawl from moving to the unlatched condition and unlatching the latch assembly; the first and second stop surfaces being non-parallel to a periphery surface of the aperture in the plate; the plate does not move with respect to the pin or the lock lever; the lock lever being movable by a lock cylinder that moves the lock lever about an axis; and at least a portion of the lock cylinder being disposed through the aperture.
Another illustrative embodiment of the present disclosure provides a vehicle that includes a door and a security tether. The security tether is configured to attach to a latch assembly on the door to prevent the latch assembly from being moved to an unlatched condition. The security tether includes a plate configured to attach to the latch assembly; the plate includes a hole disposed through the plate of a first diameter that is sized to receive at least a portion of a lock assembly that is disposed through the hole; the plate further including a channel formed at a periphery of the hole to create a portion of the hole to have a second diameter; the first diameter being less than the second diameter; the channel terminates at one end by a first stop and terminates at a second end by a second stop; and the first and second stops are spaced apart from each other and are configured to limit movement of the lock assembly.
Another illustrative embodiment of the present disclosure provides a vehicle that includes a door and a security tether. The security tether is configured to attach to a latch assembly to prevent a latch assembly on the door from being moved to an unlatched condition. The security tether further includes a plate configured to attach to the latch assembly; the plate includes a hole disposed through the plate that is sized to receive at least a portion of a lock assembly that is disposed through the hole; a portion of the hole extends to the periphery of the plate forming an opening transverse to the longitudinal extent of the hole; the opening terminates at one end by a first stop and terminates at a second end by a second stop; and the first and second stops are spaced apart from each other and are also configured to limit movement of the lock assembly.
Additional features of the present disclosure will become apparent to those skilled in the art upon consideration of illustrative embodiments including the best mode of carrying out the disclosure as presently perceived.
The present disclosure will be described hereafter with reference to the attached drawings which are given as non-limiting examples only, in which:
A rear perspective view of an illustrative embodiment of a vehicle, such as pickup truck 1, is shown in
A front perspective view of vehicle door latch assembly 2 is shown in
An embodiment of the present disclosure herein includes a tether structure 30 (see
A rear perspective view of vehicle door latch assembly 2 is shown in
What is new to latch assembly 2 is the addition of security tether 30 with bolt 28 and spacer 90. This tether couples to both shaft 16 and lock lever 26 about lock cylinder assembly 24 to prevent excessive rotational force on shaft 16 from breaking lock cylinder 24, thereby lock lever 26 unlocking and unlatching latch assembly 2.
A rear perspective view of a prior art version of latch assembly 2 is shown in
An exploded view of vehicle door latch assembly 2 that includes security tether 30 is shown in
Security tether 30, having openings 88 and 92 disposed therethrough, is coupled to latch assembly 2 via bolt 28. A spacer 90, as well as bolt 28, spaces apart tether 30 from pawl 18 and cam washer 86 (see also
There are essentially three failure modes for the prior art version of latch assembly 2. The first is where the axes of both shaft 16 and lock cylinder 24 splay themselves apart when pawl 18 is rotated in direction 12. This is caused by wall portion 34 of pawl 18 pushing against lock lever 26 when force is being applied towards direction 12. Another failure mechanism is when a force on pawl 18 is applied in direction 12 causing wall portion 34 of pawl 18 to engage lock lever 26 causing excessive force on retainer 106 and e-ring 64. This torsion force causes both structures to fail which essentially allows lock lever 26 to “pop” off of lock cylinder 24. This allows pawl 18 to be moveable. A third failure mechanism occurs when applying excessive force against pawl 18 in direction 12, causing wall portion 34 of pawl 18 to apply a force against lock lever 26. But instead of retainer 106 failing, the internal locking structures in lock cylinder 24 strip, thereby causing lock lever 26 to be moveable to the unlocked condition and allowing pawl 18 to move and unlatch. The embodiments of the security tether keep the axis of shaft 16 (with bolt 28) and lock cylinder 24 substantially parallel to each other under excessive force preventing the first failure mechanism as described above. In addition, the tethers absorb the force applied to lock lever 26 by wall portion 34 of pawl 18, thereby preventing the failure of lock lever 26 by either the second or third failure mechanisms described above.
Front perspective views of embodiments of security tethers 30, 100, and 105 are shown in
Edge 96 on lever slot portion 94 now receives the force of lock lever 26 instead of the force received by retainer 106 and e-ring 64. This means first, there is a strong reinforcement to hold the locked condition, and second, any strong forces applied to edge 96 through shaft 16 will cause a failure at the shaft instead of at the lock, and particularly at the pawl. Accordingly, any failure due to excess force will not occur at the pawl nor the retainer and clip and, thus, not move latch tab 20.
Surface 107 on the embodiments keeps the tether positioned against the lock cylinder 24 (see also
Security tether 100 is similar to that shown in embodiment 30 except that opening 88 and slot 94 are shifted in order to accommodate a lock cylinder of different configuration. This embodiment shows opening 98 configured to accept a 20 degree lock lever. It is appreciated that the angle of opening 98 may be set to any degree and is not limited to a 20 degree lock lever.
Security tether 105 included in
Rear perspective views of assembly 2, as shown in
Latch assembly 2, shown in
The views shown in
Illustrative dimensions of an embodiment of security tether 30 are shown in
The figures and descriptions provided herein may have been simplified to illustrate aspects that are relevant for a clear understanding of the herein described devices, systems, and methods, while eliminating, for the purpose of clarity, other aspects that may be found in typical devices, systems, and methods. Those of ordinary skill may recognize that other elements and/or operations may be desirable and/or necessary to implement the devices, systems, and methods described herein. Because such elements and operations are well known in the art, and because they do not facilitate a better understanding of the present disclosure, a discussion of such elements and operations may not be provided herein. However, the present disclosure is deemed to inherently include all such elements, variations, and modifications to the described aspects that would be known to those of ordinary skill in the art.
Although certain embodiments have been described and illustrated in exemplary forms with a certain degree of particularity, it is noted that the description and illustrations have been made by way of example only. Numerous changes in the details of construction, combination, and arrangement of parts and operations may be made. Accordingly, such changes are intended to be included within the scope of the disclosure, the protected scope of which is defined by the claims.
The present application is a continuation of application Ser. No. 14/928,003, filed on Oct. 30, 2015, entitled “Vehicle Door Latch Security Tether” and claims priority to U.S. Provisional Patent Application, Ser. No. 62/073,608 filed on Oct. 31, 2014, entitled “Vehicle Door Latch Security Tether.” To the extent not included below, the subject matter disclosed in those applications is hereby expressly incorporated into the present application.
Number | Date | Country | |
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62073608 | Oct 2014 | US |
Number | Date | Country | |
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Parent | 14928003 | Oct 2015 | US |
Child | 16562656 | US |