Door Entry Latch

Abstract

A latch has a latch bolt mounted on a rack and a top gear which engages the rack. The top gear can be driven by an idle gear which is disengageable from a drop gear which in turn is engaged with a lockable drive gear upon rotation of a cam disc. Initial rotation of the cam disc disengages the drop gear. Further rotation of the cam disc moves the top gear so as to permit the rack to move the bolt to the unlatched position. The latch can be operated from one side by the rotation of a lock plug in the drive. The other side of the latch has a turnhandle on the cam disc which unlatches the latch even when the drive gear is locked from the outside.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be now described with reference to the accompanying drawings in which:

FIG. 1 shows an exploded view of a latching means according to the present invention;

FIG. 2 shows an exploded view of a first embodiment of the latch according to the present invention without a cover and without a cam means;

FIG. 3 shows the first embodiment of the latch according to the present invention without a cam means with the cover being placed on the housing;

FIG. 4 shows an exploded view of the first embodiment of the latch according to the present invention without a cam means having an oil damper;

FIG. 5 shows an exploded view of the first embodiment of the latch according to the present invention having a turnhandle and a microswitch;

FIG. 6 shows a perspective view of the interior side of the first embodiment of the latch according to the present invention;

FIG. 7 shows the interior facing side of the first embodiment of the latch according to the present invention with the cover removed and the latching means in the latched position;

FIG. 8 shows a right side view of the first embodiment of the latch according to the present invention with the cover removed;

FIG. 9 shows the interior facing side of the first embodiment of the latch according to the present invention with the cover removed and the latching means in the unlatched position;

FIG. 10 shows a right side view of the first embodiment of the latch according to the present invention with the cover removed;

FIG. 11 shows a left side view of the first embodiment of the latch according to the present invention having a turnhandle;

FIG. 12 shows a right side view of the first embodiment of the latch according to the present invention having a turnhandle;

FIG. 13 shows the exterior facing side of the first embodiment of the latch according to the present invention and the latching means in the latched position;

FIG. 14 shows the interior facing side of the first embodiment of the latch according to the present invention and the latching means in the latched position;

FIG. 15 shows a sectional view along line A-A of FIG. 14;

FIG. 16 shows a perspective view of the interior facing side of the first embodiment of the latch according to the present invention and a first type of adaptor for a lock plug and the latching means in the latched position;

FIG. 17 shows the exterior facing side of the first embodiment of the latch according to the present invention and a first type of adaptor for a lock plug and the latching means in the latched position;

FIG. 18 shows a perspective view of the interior facing side of the first embodiment of the latch according to the present invention and a second type of adaptor for a lock plug and the latching means in the latched position;

FIG. 19 shows the exterior facing side of the first embodiment of the latch according to the present invention and a second type of adaptor for a lock plug and the latching means in the latched position;

FIG. 20 shows a perspective view of the interior facing side of the first embodiment of the latch according to the present invention and a third type of adaptor for a lock plug and the latching means in the latched position;

FIG. 21 shows the exterior facing side of the first embodiment of the latch according to the present invention and a third type of adaptor for a lock plug and the latching means in the latched position;

FIG. 22 shows a perspective view of the interior facing side of the first embodiment of the latch according to the present invention and a fourth type of adaptor and a lock plug and the latching means in the latched position;

FIG. 23 shows the exterior facing side of the first embodiment of the latch according to the present invention and a fourth type of adaptor and a lock plug and the latching means in the latched position;

FIG. 23A shows a perspective view of the interior facing side of the first embodiment of the latch according to the present invention and a fourth type of adaptor and a lock plug and the latching means in the unlatched position;

FIG. 23B shows the exterior facing side of the first embodiment of the latch according to the present invention and a fourth type of adaptor and a lock plug and the latching means in the unlatched position;

FIG. 24 shows a perspective view of the interior facing side of the first embodiment of the latch according to the present invention and a fifth type of adaptor for a lock plug and the latching means in the latched position;

FIG. 25 shows the exterior facing side of the first embodiment of the latch according to the present invention and a fifth type of adaptor for a lock plug and the latching means in the latched position;

FIG. 26 shows the interior facing side of the first embodiment of the latch according to the present invention without an adaptor and cam means and the latching means in the latched position;

FIG. 27 shows a perspective view of the first embodiment of the latch according to the present invention without an adaptor and the latching means in the latched position and the drop gear and the idler gear disengaged;

FIG. 28 shows the interior facing side of the first embodiment of the latch according to the present invention having a cam means which has disengaged the idler gear from the drop gear and the latching means in the latched position;

FIG. 29 shows a sectional view along line B-B of FIG. 28;

FIG. 30 shows the interior facing side of the first embodiment of the latch according to the present invention having a cam means which has disengaged the idler gear from the drop gear and moved the latching means to the unlatched position;

FIG. 31 shows a sectional view along line C-C of FIG. 30;

FIG. 32 shows the interior facing side of the first embodiment of the latch according to the present invention wherein the drive gear has rotated the drop gear which in turn has rotated the top gear to move the latching means to the unlatched position;

FIG. 33 shows a perspective view of the interior facing side of the first embodiment of the latch according to the present invention wherein the idler gear and drop gear are engaged;

FIG. 34 shows a sectional view along line D-D of FIG. 34;

FIG. 34A is a left side perspective view of the cover plate and drive gear having an abutment of the second embodiment of the invention;

FIG. 34B is a partial view of the cover plate and drive gear of FIG. 34A;

FIG. 34C is a front view of the latching means of the present invention without a rack;

FIG. 34D shows a sectional view along line E-E of FIG. 34C;

FIG. 35 shows the interior facing side of the first embodiment of the latch according to the present invention wherein a pin of the latching means is in a slot in the rack when the latch is in the latched position;

FIG. 36 shows a partial view of the latch of FIG. 35 showing the pin in the slot of the rack;

FIG. 37 shows the interior facing side of the first embodiment of the latch according to the present invention wherein a pin of the latching means is moved in a slot in the rack and a channel in the housing when the latch is in the latched position;

FIG. 38 shows a partial view of the latch of FIG. 37 showing the pin in the slot of the rack;

FIG. 39 shows a left side view of the first embodiment of the latch without the housing according to the present invention with a turnhandle and cam means in a rest position when the latch is in the latched position;

FIG. 40 shows a left side view of the first embodiment of the latch without the housing according to the present invention after the turnhandle and cam means have been rotated such that the cam means disengages the idler gear from the drop gear when the latch is in the latched position;

FIG. 41 shows a left view of the first embodiment of the latch without the housing according to the present invention after the turnhandle and cam means have been rotated such that the idler gear is disengaged from the drop gear and the latching means has been moved to the unlatched position upon further rotation of the cam means;

FIG. 42 shows the idler gear and drop gear of the present invention engaged by a protuberance on the drop gear;

FIG. 43 shows the idler gear and drop gear aligned to be engaged by a protuberance on the drop gear;

FIG. 44 shows the idler gear and drop gear rotated with respect to each other such that the idler gear and drop gear cannot engage;

FIG. 45 shows the shows the idler gear and drop gear aligned to be reengaged by a protuberance on the drop gear;

FIG. 46 shows the shows the idler gear and drop gear reengaged by a protuberance on the drop gear;

FIG. 47 shows a right side view of the second embodiment of the latch without the housing according to the present invention after the turnhandle and cam means have been rotated such that the cam means disengages the idler gear from the drop gear when the latch is in the latched position;

FIG. 48 shows a right side view of the second embodiment of the latch without the housing according to the present invention after the turnhandle and cam means have been rotated such that the idler gear is disengaged from the drop gear and the latching means has been moved to the unlatched position upon further rotation of the cam means;

FIG. 49 shows a right side view of the second embodiment of the latch without the housing according to the present invention with a turnhandle and cam means in a rest position when the latch is in the latched position;

FIG. 50 shows a perspective view of the interior side of the second embodiment of the latch with a microswitch according to the present invention;

FIG. 51 shows the interior facing side of the second embodiment of the latch according to the present invention with a cam means having a surface which has moved the drop gear such that the idler gear does not engage the drop gear when the latch is in the latched position;

FIG. 52 shows a perspective view of the interior facing side of the second embodiment of the latch according to the present invention with a microswitch wherein the idler gear does not engage the drop gear and the cam means has rotated such that the latch is in the latched position;

FIG. 53 shows the interior facing side of the second embodiment of the latch according to the present invention with a microswitch wherein the idler gear does not engage the drop gear and the cam means has rotated such that the latch is in the latched position;

FIG. 54 shows a sectional view along line F-F of FIG. 53;

FIG. 55 shows a perspective view of the interior facing side of the second embodiment of the latch according to the present invention with a microswitch wherein the idler gear engages the drop gear and the latch is in the unlatched position by rotation of the drive gear;

FIG. 56 shows a view of the interior facing side of the second embodiment of the latch according to the present invention with a microswitch wherein the idler gear engages the drop gear and the latch is in the unlatched position by rotation of the drive gear;

FIG. 57 is an exploded view of the second embodiment of the latch according to the present invention having an oil damper, cam means and cam biasing means;

FIG. 58 shows a perspective view of the interior facing side of the second embodiment of the latch according to the present invention with a microswitch wherein the idler gear engages the drop gear and the latch is in the latched position;

FIG. 59 shows an exploded view of the interior facing side of the second embodiment of the latch according to the present invention with a microswitch in the latched position;

FIG. 60 shows a view of the interior facing side of the second embodiment of the latch according to the present invention and the first type of adaptor for a lock plug and the latching means in the latched position;

FIG. 61 shows a perspective view of the interior facing side of the second embodiment of the latch according to the present invention and the first type of adaptor for a lock plug and the latching means in the latched position;

FIG. 62 shows a view of the interior facing side of the second embodiment of the latch according to the present invention and the second type of adaptor for a lock plug and the latching means in the latched position;

FIG. 63 shows a perspective view of the interior facing side of the second embodiment of the latch according to the present invention and the second type of adaptor for a lock plug and the latching means in the latched position;

FIG. 64 shows a view of the interior facing side of the second embodiment of the latch according to the present invention and the third type of adaptor for a lock plug and the latching means in the latched position;

FIG. 65 shows a perspective view of the interior facing side of the second embodiment of the latch according to the present invention and the third type of adaptor for a lock plug and the latching means in the latched position;

FIG. 66 shows a view of the interior facing side of the second embodiment of the latch according to the present invention and the fourth type of adaptor for a lock plug and the latching means in the latched position;

FIG. 67 shows a perspective view of the interior facing side of the second embodiment of the latch according to the present invention and the fourth type of adaptor for a lock plug and the latching means in the latched position;

FIG. 67A shows a view of the interior facing side of the second embodiment of the latch according to the present invention and the fourth type of adaptor for a lock plug and the latching means in the unlatched position;

FIG. 67B shows a perspective view of the interior facing side of the second embodiment of the latch according to the present invention and the fourth type of adaptor for a lock plug and the latching means in the unlatched position;

FIG. 68 shows a view of the interior facing side of the second embodiment of the latch according to the present invention and the fifth type of adaptor for a lock plug and the latching means in the latched position;

FIG. 69 shows a perspective view of the interior facing side of the second embodiment of the latch according to the present invention and the fifth type of adaptor for a lock plug and the latching means in the latched position;

FIG. 70 is a right side perspective view of the cover plate and drive gear having an abutment of the second embodiment of the invention;

FIG. 71 is a partial view of the cover plate and drive gear of FIG. 70;

FIG. 72 is a perspective view of the interior facing side of the housing of the latch of the present invention;

FIG. 73 is a perspective view of the exterior facing side of the housing of the latch of the present invention;

FIG. 74 is a view of the exterior facing side of the housing of the latch of the present invention;

FIG. 75 is a view of the interior facing side of the housing of the latch of the present invention;

FIG. 76 is a right side view of the housing of the latch of the present invention;

FIG. 77 is a left side view of the housing of the latch of the present invention;

FIG. 78 is a top view of the housing of the latch of the present invention;

FIG. 79 is a bottom view of the housing of the latch of the present invention;

FIG. 80 is a perspective view of the interior facing side of the cover of the latch of the present invention;

FIG. 81 is a perspective view of the exterior facing side of the cover of the latch of the present invention;

FIG. 82 is a view of the exterior facing side of the cover of the latch of the present invention;

FIG. 83 is a perspective view of the exterior facing side of drive gear of the latch of the present invention;

FIG. 84 is a perspective view of the interior facing side of the drive gear of the latch of the present invention;

FIG. 85 is a view of the exterior facing side of the drive gear of the latch of the present invention;

FIG. 86 is a view of the interior facing side of the drive gear of the latch of the present invention;

FIG. 87 is a side view of the drive gear of the latch of the present invention;

FIG. 88 is a bottom view of the drive gear of the latch of the present invention;

FIG. 89 is a perspective view of the exterior facing side of idler gear of the latch of the present invention;

FIG. 90 is a perspective view of the interior facing side of the idler gear of the latch of the present invention;

FIG. 91 is a side view of the idler gear of the latch of the present invention;

FIG. 92 is a perspective view of the exterior facing side of the drop gear of the latch of the present invention;

FIG. 93 is a perspective view of the interior facing side of the drop gear of the latch of the present invention;

FIG. 94 is a side view of the drop gear of the latch of the present invention;

FIG. 95 is a perspective view of the exterior facing side of the top gear of the latch of the present invention;

FIG. 96 is a perspective view of the interior facing side of the top gear of the latch of the present invention;

FIG. 97 is a perspective view of the bottom side of the rack of the latch of the present invention;

FIG. 98 is a perspective view of the bottom side of the bolt of the latch of the present invention;

FIG. 99 is a perspective view of the interior facing side of the turnhandle of the latch of the present invention;

FIG. 100 is a perspective view of the exterior facing side of the turnhandle of the latch of the present invention;

FIG. 101 is a side view of the turnhandle of the latch of the present invention;

FIG. 102 is a top view of the oil damper of the latch of the present invention;

FIG. 103 is a perspective view of the oil damper of the latch of the present invention;

FIG. 104 is a perspective view of the compression spring of the latch of the present invention;

FIG. 105 is a side view of the torsion spring of the latch of the present invention;

FIG. 106 is a perspective view of the torsion spring of the latch of the present invention;

FIG. 107 is a perspective view of the exterior facing side of the first type of adaptor for the latch of the present invention;

FIG. 108 is a perspective view of the interior facing side of the first type of adaptor for the latch of the present invention;

FIG. 109 is a perspective view of the exterior facing side of the second type of adaptor for the latch of the present invention;

FIG. 110 is a perspective view of the interior facing side of the second type of adaptor for the latch of the present invention;

FIG. 111 is a perspective view of the exterior facing side of the third type of adaptor for the latch of the present invention;

FIG. 112 is a perspective view of the interior facing side of the third type of adaptor for the latch of the present invention;

FIG. 113 is a perspective view of the exterior facing side of the fourth type of adaptor for the latch of the present invention;

FIG. 114 is a top view of the fourth type of adaptor for the latch of the present invention;

FIG. 115 is a bottom view of the fourth type of adaptor for the latch of the present invention;

FIG. 116 is a left side view of the fourth type of adaptor for the latch of the present invention;

FIG. 117 is a right side view of the fourth type of adaptor for the latch of the present invention;

FIG. 118 is a perspective view of the exterior facing side of the fifth type of adaptor for the latch of the present invention;

FIG. 119 is a perspective view of the interior facing side of the fifth type of adaptor for the latch of the present invention;

FIG. 120 is a view of the interior facing side of the cam means of the first embodiment of the latch of the present invention;

FIG. 121 is a right side view of the cam means of the first embodiment of the latch of the present invention;

FIG. 122 is a sectional view along line G-G of FIG. 121;

FIG. 123 is a perspective view of the interior facing side of the cam means of the first embodiment of the latch of the present invention;

FIG. 124 is a perspective view of the exterior facing side of the cam means of the first embodiment of the latch of the present invention;

FIG. 125 is a view of the interior facing side of the cam means of the second embodiment of the latch of the present invention;

FIG. 126 is a right side view of the cam means of the second embodiment of the latch of the present invention;

FIG. 127 is a sectional view along line H-H of FIG. 126;

FIG. 128 is a perspective view of the interior facing side of the cam means of the second embodiment of the latch of the present invention;

FIG. 129 is a perspective view of the exterior facing side of the cam means of the second embodiment of the latch of the present invention;

Claims

1. A latch for selectively latching and unlatching a first member which is connected to said latch to the surface of a keeper on the second member, said latch comprising: a latching means for engaging the surface of the keeper on the second member, said latching means being moveable from a latched position in which said latching means engages the surface of the keeper to an unlatched position in which said latching means does not engage the surface of the keeper such that the first member can be unlatched from the second member;a rotating means for moving the latching means between the latched position and the unlatched position, said rotating means being moveable between a first position in which said latching means is in the latched position to a second position in which said latching means is in the unlatched position;a driving means for moving the rotating means between the first position and the second position;a disengaging means for disengaging the driving means from the rotating means such that said rotating means can move said latching means between the latched and unlatched position when said driving means is not moving, said disengaging means being moveable from an engaged position in which movement of said driving means moves said rotating means such that said latching means can move between the latched and unlatched position, and a disengaged position in which movement of the driving means does not move said rotating means;a cam means for moving said disengaging means between the engaged and disengaged position and for moving said rotating means such that said rotating means moves the latching means between the first position in which said latching means is in the latched position to a second position in which said latching means is in the unlatched position.

2. The latch according to claim 1 further comprising a mounting means for supporting the latching means, said mounting means having a blocking means for engaging the latching means in a blocking position such that said latching means is not capable of movement from the latched position to the unlatched position, and a releasing means for disengaging the blocking means from said latching means when said cam means is moved.

3. The latch according to claim 2 wherein the cam means is a disc having a cam surface and said disengaging means is a gear which is axially displaceable by said cam means between the engaged position and the disengaged position upon rotation of said cam means.

4. The latch according to claim 3 wherein said cam means is rotatable about 45 degrees to move the disengaging means from the engaged position to the disengaged position.

5. The latch according to claim 3 wherein the latching means is provided with a channel and said blocking means is a pin and a notch in said mounting means in which said pin is located when said latching means is in the blocked position, said latching means having a surface which moves said pin out of the notch when said cam means is rotated. having a blocking means is a notch in the mounting means in which a cam means.

6. The latch according to claim 3 wherein the mounting means is provided with a guide means for guiding movement of the latching means between the latched and unlatched position and said latching means is provided with a sliding means for engaging said guide means during movement of said latching means between the latch and unlatched position.

7. The latch according to claim 3 further comprising a biasing means for biasing said cams means to a position such that said cam means permits said disengaging means to be in the engages position.

8. The latch according to claim 1 in which said cam means first moves said disengaging means to the engaged position and then moves the releasing means to position in which said releasing means permits movement of the actuating means.

9. The latch according to claim 1 wherein: the latching means has a rack having rack teeth;said rotating means is a gear, said gear being rotatable, said gear having teeth for engaging said rack teeth such that said latching means is moved between the latched and unlatched position.