Emergency access privacy lock and access key

Abstract

A safety lock and access key for doors that otherwise need to remain locked comprising a lock body containing a spring biased catch extending from one end of the body to engage in a keep of the door frame, a lever for moving the catch into the body to unlock the door, and a tool for unlocking locked doors.

Claims

1. A turn to lock style emergency access privacy lock for use on interior doors to enable a user to unlock the door from either side in case of an emergency or accidental locking of an occupant inside a room, comprising: a spring loaded exterior door knob; an interior door knob including a thumb turn, the exterior door knob and the interior door knob are capable of being attached to opposing sides of a door, wherein the exterior door knob and the interior door knob are separately moveable relative to the door for operating the privacy lock; and a fluted spindle positioned between the exterior door knob and the interior door knob for movement relative the exterior door knob and the interior door knob, wherein the fluted spindle is an elongated member with an exterior helically shaped groove formed therein; wherein the exterior door knob is supported by an exterior rosette relative to the door allowing for selective movement of the exterior door knob toward the door, such that when the exterior door knob is pushed linearly toward the door, the fluted spindle is engaged by a knob insert of the exterior door knob rotating the fluted spindle to cause the fluted spindle to twist the thumb turn and unlock the privacy lock.

2. The turn to lock style emergency access privacy lock of claim 1 wherein the exterior door knob requires application of a pressure of 7-20 pounds to cause engagement of the fluted spindle.

3. The turn to lock style emergency access privacy lock of claim 1 wherein the exterior door knob will return to an original position for normal use after the privacy lock is unlocked.

4. A turn to lock style emergency access privacy lock for use on interior doors to enable a user to unlock the door from either side in case of an emergency or accidental locking of an occupant inside a room, comprising: spring loaded exterior door knob; an interior door knob including a thumb turn, each of the exterior door knob and the interior door knob is capable of being attached to opposite sides of a door, wherein the exterior door knob and the interior door knob are separately rotatable relative to the door; a fluted spindle positioned between the exterior door knob and the interior door knob for movement relative the exterior door knob and the interior door knob, wherein the fluted spindle is an elongated member with an exterior helically shaped groove formed therein; wherein the exterior door knob is supported by an exterior rosette relative to the door allowing for selective movement of the exterior door knob toward the door, such that and when the exterior door knob is pushed with a force between 7-20 pounds in a direction towards the door, the fluted spindle is engaged by a knob insert of the exterior door knob rotating the fluted spindle to twist the thumb turn and unlock the privacy lock.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) In the following, embodiments of the present invention will be explained in detail on the basis of the drawings, in which:

(2) FIG. 1 is an exploded view of the turn to lock style emergency access privacy lock.

(3) FIG. 1A is a cross sectional view along the line 1A-1A in FIG. 1.

(4) FIG. 2 is an exploded view of the turn to lock style emergency access privacy lock retrofit tool.

(5) FIG. 3 is a cutaway view of the push to lock style emergency access privacy lock.

(6) FIG. 4 is a close up cutaway view of the push to lock style emergency access privacy lock retrofit tool.

DESCRIPTION OF THE PREFERRED EMBODIMENT

(7) Referring now to the drawings wherein the showings are for purposes of illustrating a preferred embodiment of the present invention and not for purposes of limiting the same, according to a first embodiment of this invention there is a turn-to-lock style knob assembly (or lockset as referenced below) 10, see FIG. 1. From the inside of the door, the door can be locked with the standard thumb turn 1 found on all turn-to-lock style privacy locks. The interior knob 2 permanently houses the thumb turn 1. The interior knob 2 is mounted to a standard door via a rosette 3. The outside portion 100 of the lockset 10 will still function the same way as a traditional privacy lock in non-emergency situations. However, the exterior knob 14 is spring loaded and linearly biased in a direction away from the door in a manner allowing the user to push the exterior knob 14 linearly inwards, that is, along the longitudinal axis extending between the interior knob 2 and the exterior knob 14, towards the door. This linear movement of the exterior knob 14 results in the engagement and twisting of a fluted spindle 4 in manner causing rotation of the fluted spindle 4 about the longitudinal axis extending between the interior knob 2 and the exterior knob 14. As will be explained below in greater detail, because a first end 110 of the fluted spindle 4 is coupled to the exterior knob 14 via a knob insert 12 and the second end 112 of the fluted spindle 4 is coupled to the thumb turn 1, rotation of the fluted spindle 4 twists the thumb turn 1 thereby unlocking the door.

(8) In conjunction with the twisting of the thumb screw 1 to unlock the door in accordance with the present invention, it should be appreciated the twisting of the thumb turn 1 has no significance in unlocking the door in this sentence. As those skilled in the art of locks will appreciate, the thumb turn 1 does turn when the lockset 10 is unlocked, but it is not the reason why the lockset 10 unlocks. Referring to FIG. 1, when the lockset 10 is locked, it is because the locking plate 18 on the spindle housing 5 is engaged with a screw post 19 of the rosette 3. When the fluted spindle 4 rotates, it slides the locking plate 18 within the spring cage 20 of the spindle housing 5, the locking plate 18 slides over to one side freeing it up from the screw post 19 allowing the whole spring cage 20 to rotate freely in either direction and the lockset 10 is now unlocked. Essentially the thumb turn 1 and fluted spindle 4 are doing the same thing, the only reason why the thumb turn 1 rotates when unlocked from the exterior side (when emergency push to unlock action is taken) is so that it is in the correct unlocked position once the user takes their hand off the lock.

(9) The spring-loaded exterior knob 14 requires a necessary force of between a minimum of 7 to a maximum of 20+/ foot-pounds to cause movement of the exterior knob 14 linearly toward the door and along the longitudinal axis extending between the interior knob 2 and the exterior knob 14, in order to unlock the door in the manner described above so that a locked door cannot be easily unlocked and opened. In this embodiment the lock can still be unlocked using an emergency tool, such as the manufacturer provided tool or a small slot screwdriver.

(10) In particular, the exterior portion 100 of this lockset 10 uses a return spring 7 to create the linear bias pushing the exterior knob 14 away from the door. The return spring 7 is housed between the latch 6 on one side and the knob keeper ring 8. The knob keeper ring 8 is further disposed on to the mounting plate 9 on the inside the door (not shown). The exterior knob 14 is mounted to the door in standard fashion with two mounting screws 13. The exterior knob 14 has a hollow knob insert 12 with the first end 102 of the knob insert 12 crimped to the inner surface 102 of the exterior knob 14. The second end 104 of the knob insert 12 abuts with the knob keeper ring 8 thereby transferring the spring bias of the return spring 7 to the knob insert 12 and ultimately to the exterior knob 14. The second end 104 of the knob insert 12 is hollow and is configured to receive the fluted spindle 4 so that when the exterior knob 14 is pushed in the second end 104 of the knob insert 12 engages the fluted spindle 4 causing the fluted spindle 4 to turn and slide the locking plate 18 within the spring cage 20 of the spindle housing 5, thereby causing the locking plate 18 to slide over to one side freeing it up from the screw post 19 and allowing the whole spring cage 20 to rotate freely in either direction (and the lockset 10 is now unlocked). Turning of the fluted spindle 4 is achieved based upon the interaction of the fluted spindle 4 with the knob insert 12. In particular, and as mentioned above, the fluted spindle 4 has a first end 110 configured for engagement with the knob insert 12 and a second end 112 coupled to the thumb turn 1.

(11) The knob insert 12 is configured to slide through the exterior rosette 15 as it is moved when the exterior knob 14 is pushed toward the door. Referring to FIG. 1A, the knob insert 12 includes an engaging pin 106 between its first end 102 and its second end 104 in the middle of the knob insert 12. The fluted spindle 4 rests inside a spindle housing 5. The fluted spindle 4 is made from solid metal or appropriately durable material with an exterior groove 108 that can be characterized as helical or fluted in shape.

(12) As the exterior knob 14 is pushed toward the door, the second end 104 of the knob insert 12, in which the fluted spindle 4 is received, slides across the fluted spindle 4, and the engaging pin 106 of the knob insert 12 contacts the groove 108 of the fluted spindle 4, which forces the fluted spindle 4 to rotate, thus unlocking the door. As mentioned above, the return spring 7, which allows unlocking from the outside, requires at least minimum of 7 and maximum of 20 foot-pounds+/ of force before it will engage. Once the exterior knob (or lever) 14 is depressed and the door is unlocked, it will return to its original position so that the door and exterior knob 14 can continue to be used as normal.

(13) According to a second embodiment of this invention, the knob and door can be locked from the inside using the standard thumb turn found on all turn to lock style privacy locks, for example a Kwikset privacy lock. FIG. 2 shows a kit 40 for adapting to existing installed door locks. The kit 40 portion comprises a thumb turn 21 attached to frictional mounting tube 22 and the frictional mounting tube 22 retains an activating pin 24. The frictional mounting tube 22 is designed to have a slight taper so that when the kit 40 is pushed into the existing emergency hole the kit will remain stably mounted therein. The activating pin 24 has a flat head shape and spring 23 that engages the proximal end of the spindle 34. When the thumb turn 21 is twisted, the activating pin 24 turns the spindle 34 to unlock the door. When the thumb turn 21 is twisted back to the locked position the door will be re-locked. The outside portion of the lock still functions as a traditional privacy lock in non-emergency situations, and the standard emergency tool can still be used to unlock the door.

(14) FIG. 4 discloses a similar third embodiment of a linear lock release kit 50 wherein an activating pin 54 is disposed within a frictional mounting tube 53, the frictional mounting tube 53 is pushed into the existing emergency tool-hole of an installed privacy lock. While the kit 50 is removable it is intended to remain permanently in place. The kit 50 further comprises a handle set seat 52 and a rubber dome 51 to cover the activating pin 54. The activating pin 54 engages the spindle (not shown) of a previously installed lock. The handle set seat 52 keeps frictional mounting tube 53 from shifting and can be comprised of any suitable material. The rubber dome 51 could be glued or attached to the activating pin 54 to return the activating pin to its original position after actuation. Alternatively, a return spring would return the activating pin 54 to its original position after actuation.

(15) A fourth embodiment as shown in FIG. 3 shows a Schlage like push button privacy lock adapted with a sliding knob 64 with an engaging tube 62 and engaging spring 61. Two keeper pins 63 allow the sliding knob 64 to slide in and out of the lock body 65 via narrow parallel slits 66 on the knob stem 67. The slits 66 and keeper pins 63 act together like rails to keep the knob 64 oriented with the axis between the two knobs of a lock. The parallel slits 66 are variable in length to accommodate actuation of various lock manufacturer designs and door thicknesses. The operator pushes the exterior knob 64 causing the engaging tube 62 to depress the spindle, thus unlocking the door.

(16) In an alternative embodiment the lock incorporates biometric data analysis such as voice recognition, finger print, retinal scan, facial recognition, hand grip, and similarly known unique identifying details of a person. Biometric data would be utilized to set over ride the lock. For example, security settings could be incorporated to allow users to open the door based upon preprogramed settings. Much like a user account on a computer network, there could be an administrator account with the fullest access to the network, a user account could be used to override a more junior account, such as one for a child.

(17) The foregoing descriptions are, at present, considered to be the preferred embodiments of the present invention. However, it is contemplated that various changes and modifications apparent to those skilled in the art, may be made without departing from the present discovery. Therefore, the foregoing description is intended to cover all such changes and modifications encompassed within the spirit and scope of the present discovery, including all equivalent aspects.