|Publication number||US3625557 A|
|Publication date||Dec 7, 1971|
|Filing date||Jun 8, 1970|
|Priority date||Jun 8, 1970|
|Publication number||US 3625557 A, US 3625557A, US-A-3625557, US3625557 A, US3625557A|
|Inventors||Jack H Jensen|
|Original Assignee||Rylock Co Ltd|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (3), Classifications (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
limited States Patent  Inventor Jack H. Jensen Danville, Calif.
21 1 Appl. No. 44,424
 Filed June 8, 1970  Patented Dec. 7, 1971  Assignee Rylock Company, Ltd.
Union City, Calif.-
 LATCH UNIT FOR SLIDING-TYPE DOORS 1 Claim, 4 Drawing Figs.
 U.S. Cl 292/128, 70/D1G. 52, 292/228  Int. Cl E05c 19/12  Field 01 Search 292/56.
3,174,783 3/1965 Russell 292 103 .2,742,3o9 4/1956 Hillgren 292/101x FOREIGN PATENTS 9,865 1395 GreatBritainW; 292/128 Primary Examiner-Robert L. Wolfe AnomeyWebster and Webster ABSTRACT: A latch unit, to secure a sliding-type door to the door frame, comprising a rotatably mounted hook on a stile of the door and adapted by inside finger-lever manipulation for movement between a retracted unlatched position and an advanced latched position projecting in downwardly opening relation through a vertical slot in the adjacent doorframe jamb and engaging over the lip at the lower end of such slot; the hook being an integral part of a finger-lever operated rotary plate, such plate being camlike and having a pair of edges of predetermined position and configuration. and a leaf spring peripherally engaging the rotary plate, said spring yieldably bearing on one such edge to maintain the hook in retracted position and yieldably bearing on the other edge to maintain the hook in advanced position while spring-urging said hook downwardly against said lip to prevent escape therefrom upon the door being vertically jounced from the outside.
LATCH UNIT FOR SLIDING-TYPE DOORS BACKGROUND OF THE INVENTION In conventional sliding-type doors (such as those of glass in a metallic frame) there is commonly a certain amount of vertical loose play possible between the door and its frame, and which loose play permits the door to be vertically jounced to cause the downwardly opening hook-of the latch unit on a stile of the door-to escape from engagement with the hookreceiving lip on the adjacent jamb of the door frame. In this way, it has heretofore been possible for unauthorized persons to unlatch and open the door and thus gain access to the house or other structure provided with such door. The present invention was developed in the course of seeking a solution to such problem.
SUMMARY OF THE INVENTION The present invention provides, as a major object, a latch unit, for a sliding-type door, which is tamper-proof in the sense that such latch unit cannot be released or unlatched from outside the door by vertically jouncing the latter.
The present invention provides, as another important object, a latch unit as above-on a stile of the door and adapted to secure the same to the door framewhich includes a rotatably mounted hook adapted by inside finger manipulation for movement between a retracted unlatched position and an advanced latched position projecting in downwardly opening relation from said stile of the door, through a vertical slot in the adjacent doorframe jamb, and engaging over the lip at the lower end of such slot; there being novel means associated with the hook operative, in said advanced latched position thereof, to maintain the hook against escape from said lip upon vertical jouncing being imparted to the door from outside thereof.
The present invention provides, as still another important object, a latch unit-as above-wherein said novel means comprises a rotary plate of which the hook is an integral part, such plate being camlike and having a pair of edges of predetermined position and configuration, and a leaf spring yieldably bearing on one such edge to maintain the hook in said retracted position and yieldably bearing on the other edge to maintain the hook in said advanced position.
The present invention provides, as a further object, a latch unit which is designed for ease and economy of manufacture, and ready installation.
The present invention provides, as a still further object, a practical, reliable, and durable latch unit, and one which is exceedingly effective for the purpose for which it is designed.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevation showing the latch unit mounted on a stile of a sliding-type door; the unit being shown as latched.
FIG. 2 is an enlarged elevation of the latch unit; the view looking forward from the back of such latch unit, and the latter being shown as unlatched.
FIG. 3 is a view similar to FIG. 2 but shows the latch unit as latched.
FIG. '4 is a plan view, partly in section, taken directly below the lower end of the leaf spring.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now more particularly to the drawings and to the characters of reference marked thereon, the latch unit, indicated generally at l, is mounted on the outer stile 2 of a sliding-type door 3; such door being carried in a frame 4 which includes a jamb 5 against which the stile 2 makes contact when the door is closed.
When the door is latched closed, a downwardly opening hook 6 projects from the latch unit 1 through a vertical slot 7 in the face 8 of jamb 5; the hook engaging over the lip 9 at the lower end of said slot 7 as shown in FIG. 3.
The latch unit 1 includes a support or housing I0, in the form of an inwardly facing channel, secured to the stile 2 by bolts 11; there being a handgrip 12 conventionally attached in standoff relation to the housing 10.
A transverse stub shaft 13 is journaled on the housing 10, and exteriorly thereof is fitted with a finger lever 14, while inside said housing the shaft 13 is provided-by means of a hub l5--with a rotary plate I6 of which the hook 6 is an integral part.
When the finger lever 14 is projecting upward, as in FIG. 3, such rotary plate is disposed in a rotative position with said hook 6 projecting outwardly through a cutaway 17 in housing 10, and thence through the vertical slot 7 in the face 8 of jamb 5, with the hook engaged over the lip 9. This is the advanced latched position of the hook 6.
When the finger lever I4 is projecting downward, as in FIG. 2, the rotary plate 16 is disposed in a rotative position with the hook 6 retracted into the housing and bearing against the inner side of the latter as a stop. This is the retracted unlatched position of the hook 6.
The rotary plate 16 is formed-at its periphery, and in endto-end relation-with a straight edge 18 and a curved edge 19; the straight edge 18 being disposed substantially perpendicular rearwardly of and projecting, in rearwardly facing relation, above the shaft 13 when the hook 6 is in its advanced latched position. The curved edge 19 is disposed rearwardly of the shaft 13 and has an upwardly facing portion when the hook 6 is in its retracted unlatched position.
A generally upright leaf spring 20 is disposed in the housing 10 between the rotary plate 16 and a plug 21 in the top of such housing; such plug fixedly anchoring the upper end of said leaf spring 20 to the housing at the outer side thereof.
At its lower end, the leaf spring 20 bears-relatively forcefully but yieldably-on the periphery of the rotary plate.
More particularly, the leaf spring 20 engages-when the hook 6 is in its advanced latched position as in FIG. 3-with an outward thrust against the then-upstanding straight edge 18 at a point above the shaft 13 whereby the rotary plate is urged in a rotative direction to hold the hook in engagement over the lip 9 at the lower end of the slot 7 in the face 8 of jamb 5. Consequently, if a person-seeking unauthorized entry-vertically jounces the door 3 (and which is commonly possible due to loose play between the door and its frame), the hook 6 remains engaged over and with the lip 9, merely rising and falling with such lip as the door is so jounced; it not being possible for the hook to bounce free.
When the hook 6 is in its retracted unlatched position as in FIG. 2, the leaf spring 20 engages, with a downward thrust, against the upwardly facing portion of the curved edge 19 at a point rearwardly of the shaft 13 whereby the rotary plate is urged in a rotative direction to hold the hook 6 against the inner side of housing I0 as a stop.
While the leaf spring 20 is effective to hold the rotary plate 16, and its hook 6, in either of its working positions, such spring does yield in response to motion imparted to said rotary plate and hook upon manipulation of finger lever 14 from in- 4 side the door to latch or unlatch the same.
From the foregoing description, it will be readily seen that there has been produced such a latch unit as substantially fulfills the objects of the invention, as set forth herein.
While this specification sets forth in detail the present and preferred construction of the latch unit, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention as defined by the appended claims.
1. A latch unit, to secure a sliding-type door to its frame, comprising an upright channel facing and secured on the door stile which is adjacent a jamb of the frame when the door is closed, a hook, the hook being an integral part of a transverse axis rotary plate journaled in connection with the channel and disposed therein, a finger lever exteriorly of the channel adapted to rotate the plate to move the hook between a retracted unlatched position wholly within the channel and an advanced latched position projecting in downwardly opening relation from the channel through a slot in the outer side thereof and a corresponding slot in said jamb, the hook in said advanced latched position engaging over a lip in the lower end of said corresponding slot, a plug in the upper end of the channel, and a leaf spring anchored at its upper end in the channel at the outer side thereof by the plug and thence depending at a downward and rearward incline in the channel to engagement under load and at its lower end against the periphery of the rotary plate, said rotary plate having two endmerged peripheral edges, of predetermined position and configuration, with which said spring engages, selectively; said leaf spring yieldably bearing on one such edge to maintain the hook in retracted unlatched position, and yieldably bearing on the other edge to maintain the hook in advanced latched position;
said one edge being disposed rearwardly of the axis of the rotary plate when the hook is in retracted unlatched position and then having an upwardly facing portion against which the spring yieldably bears with a downward thrust whereby to urge the rotary plate in a direction such that said plate is placed under load and caused to rest against the inner side of the channel as a stop; and said other edge being disposed rearwardly of and projecting, in rearwardly facing relation, upwardly relative to the axis of the rotary plate when the hook is in advanced position, the spring then yieldably bearing with an outward thrust on said other edge at a point above such axis whereby said spring urges the rotary plate in a direction such that the hook is placed under load and caused to remain in engagement with said lip and prevented from escape thereof should the door be vertically jounced relative to the frame.
* I I I. k
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US192355 *||May 21, 1877||Jun 26, 1877||Improvement in trunk-catches|
|US1378518 *||Sep 27, 1920||May 17, 1921||Combusted cbib abto bed coitstbuctiobt|
|US2742309 *||May 7, 1954||Apr 17, 1956||Carl C Hillgren||Sliding door latch|
|US3065985 *||May 25, 1961||Nov 27, 1962||Ekco Products Company||Latch unit|
|US3174783 *||Nov 9, 1962||Mar 23, 1965||Fred J Russell||Sliding door latch hub|
|US3212803 *||Oct 28, 1963||Oct 19, 1965||Russell||Sliding door latch spring plate means|
|GB189509865A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3877739 *||Feb 22, 1974||Apr 15, 1975||Ram Partitions Ltd||Door latch|
|US5653483 *||Jul 28, 1995||Aug 5, 1997||Grover; Philip D.||Sliding door latch|
|US7093320 *||Oct 1, 2001||Aug 22, 2006||Tager Jean M||Pin-less locks for sliding members|
|U.S. Classification||292/128, 70/DIG.520, 292/228|
|Cooperative Classification||E05B65/0811, Y10S70/52|