US2648560A - Locking latch - Google Patents

Description

Aug. 11, 1953 H. QUlGLEY ETAL LOCKING LATCH 2 Sheets-Sheet 2 Filed July 27, 1949 [2122/3 'FWG-A- \nveu on m e W mww a 0 W Y n T m T R W A u; M RR: E HUN Patented Aug. 11, 1953 UNITED STATES OFFICE LOCKING LATCH poration of Michigan Application July 27, 1949, Serial No. 107,087

Claims. 1

This invention relates to a door lock designed for installation, at the free vertical edge portion of a swinging door, and which automatically locks the lock bolt when the door is closed against releasing movement except through manual operation. of the door knobs. which are associated with door locks or latches, thus insuring against retraction of the lock bolt by pressing against it at its outer end or otherwise applying pressure, for example, against the beveled outer end surface of the bolt to work it back to disengage it from its keeper. With the present invention it is impossible to insert a knife blade or other thin implement between the edge of the door and the door casing to engage with the beveled end of the bolt toretract such bolt, as with our invention the bolt is positively locked in its outer position when in its keeper and cannot be retracted except by the door knob operation.

- With our-invention, the retraction of the bolt is by means of roll-backs mounted at the inner end portion of the lock assembly and which are operated by suitable spindles to which door knobs are attached, the bolts being retracted by a rotation of the spindle in either direction. Key locking of the door against opening may be used with our invention, but is not disclosed as it is not a part of the present invention.

There has: been filed heretofore, an application for a, similar type of door lock, Ser. No. 47,437, on September 2, 1948. In such door lock the bolt locking means against retraction for a pressure against the outer end of the bolt is controlled through the movement of the roll-backs, the bolt locking means camming thereagainst. It is an object; and purpose of the present invention to provide a better and improved structure in which the operation of the bolt lock is more certain and easy, through a camming action in which all tendency or danger of snubbing is eliminated. Novel structure for such improved operation is provided, an understanding of which will be had from the following description taken in connection with the accompanying drawings, in which,

Fig. 1 is a longitudinal vertical section through the bolt housing, the plane of the section through the housing being substantially that shown in line l-l of Fig. 2, the bolt mechanism and as-' sembly being shown mainly in side elevation with some parts broken away and in vertical section forbetter disclosure.

Fig. 2. is a longitudinal horizontal section generally on the plane of line 2'--2 of Fig. 1, looking in the direction indicated by the arrows and showing the main bolt and the auxiliary bolt in 2. association therewith both in outwardly projected position, and

Figs. 3' and 4 are views similar to Fig. 1, in which the lock bolt and the auxiliary bolt are both in outwardly projected position, Fig. 3 showing the parts in the position occupied when engaged, with a keeper and with the auxiliary bolt retracted, and in Fig. 4 both the lock bolt and the auxiliary bolt retracted when a door carrying the lock is opened by roll-back operation.

Like reference characters refer to like parts in the different figures of the drawings.

The housing or casing: for the lock assembly mechanism is of sheet metal and of a generally cylindrical form at its outer portion. It is usually stamped in two parts, the cylindrical form being for easy installation on a door as only a hole has to be bored at the free vertical edge of the. door for reception of the lock. The outer portion of the casing is of cylindrical form, as indicated at i, the inner portion being shaped and formed. to he of a generally rectangular form in cross section. as at 2,, having generally parallel fiat sides, from which outwardly extending rollback housings 3 are stamped or pressed. An attaching plate for the edge of the door at 4 has secured to it a cup member 5 of sheet metal which embraces the outer end portions of the two parts of the housing or casing in accordance with old practice, the detail of which it is not necessary to set forth. herein.

The bolt 6 passes through an opening in the plate 4. It is rectangular in cross section except for abeveled outer end portion for the camming retraction of the bolt when a door is closed as. such beveled portion engages the strike on the door jam, the bolt being retracted until the keeper receiving recess or opening is reached into which the bolt moves. From the inner end of the bolt a relatively heavy and vertically disposed plate 1 extends into the housing for a distance and is laterally turned at right angles terminating in a tongue 53. At the under edge of the bar T a portion of it at its rear end is cut away form- 7 casing and has an opening in its bottom through which the bar 1 slidably passes. A rod I E secured at the inner end of the bolt 6 extends therefrom and passes slidably through the bottom of the cup [0 and also through the terminating tongue 8 of rectangular portions I and 2 of the housing or casing.

From the cup IIJ upper and lower spaced generally parallel retractor bars I4 extend lengthwise of and within the lock housing toward, but terminating short of, the inner end thereof. Each bar I4 at each side is equipped with a short outwardly extending projection I5 which may be the end portions of short pins or rods passing through the upper and lower bars I4. Such projections I5 are located in the path of movement of the shoulders at the ends of are shaped flanges I6 on roll-backs II mounted for rotation in the housings I3 therefor. Such roll-backs have squared openings for the passage of a spindle therethrough to the ends of which door knobs may be attached for rocking the roll-backs. Of course, each roll-back may be independently operated as is done in some cases, by various known structures which are used in the art for such purpose.

On rotating either or both roll-backs in either direction the bars I4 are retracted and may be moved from the position shown in Fig. l to that shown in Fig. 4 the heavy coiled spring I3 being compressed, and the bolt 6 retracted and drawn into the housing.

Alongside of the bolt 6, an auxiliary member or bolt I8 is located which, preferably, is of a generally semi-cylindrical form having a length equal to the length of the bolt 6, and with its flat side thereagainst. It likewise extends through an opening in the plate 4 joining the opening passing the bolt 6. At its inner end it is equipped with a flange I9 which extends over the inner end of the bolt 6. From the flange I9 a flat bar 29 extends inwardly alongside the heavier bar I and through the bottom of the cup Ill. The bar is widened for approximately one half of its length at its inner end portion in a downward direction, there being an inclined cam edge 2| extending downwardly and inwardly between the lower edges of the narrower and wider parts of the bar 20. When the bolt 6 and the auxiliary member I8 are at outer position (Fig.

1) said downwardly and inwardly inclined edge 2| is a short distance back of the shoulder 9, the lower edges of the wider outer front portion of the bar I, and of the wider rear .portion of the bar 20 being located in substantially the same horizontal plane.

The locking member 22 for the bolt is formed from a bar or plate of flat metal, at its outer portion lying alongside of the bar 29 and at its inner lower portion having a downwardly and inwardly extending arm 23, from which a lug 24 is turned laterally to pass through an opening in a side of the housing or casing for pivotally mounting said locking member to permit its outer end to have a limited up and down movement. The locking member 22 also passes through the bottom of the cup I0 and'at its upper edge, between its ends, has a short horizontal ledge 25. The thickness of the locking member 22 vertically between the ledge 25 and the lower edge of the member is equal to the width of the bar 20 at its inner widened end portion so that when such ledge 25 is located at the upper edge of the opening through the bottom of the cup II], no pivotal up or down movement of the locking member may take place. At the outer end of the locking member 22 and at its lower edge a tongue 26 is turned laterally underneath bars or plates 20 and I.

At the upper rear portion of the lockingmember an arm 21 is formed, which has a lug 28 extending at right angles therefrom as shown. A rod 29 secured to the flange I9 of the auxiliary bolt I8 passes through an opening in the bottom of the cup I0 and through a second opening in the lug 28. A light coiled compression spring 30 is located around the rod 29 between the flange I9 and lug 28.

When a door upon which the lock is installed is open, spring I3 moves the retractor, consisting of the cup ID and the bars I4, outwardly until the projections at I5 come against the end shoulders of the flanges I6 of the roll-backs I1. The spring I2 moves the bolt 6 to its outer projected position until the laterally turned end 8 of bar or plate I comes against the cup III. The spring 30 moves the auxiliary bolt I8 outward until flange I9 comes against the inner end of the bolt 6. In such position, as shown in Fig, 1, the tongue 26 of the locking member 22 is held, in a lower position by riding against the wider inner end portion of bar 20.

When the door is closed and the beveled end of the bolt 6 rides upon the strike of the keeper, the bolt is forced inwardly. Such inward movement of the bolt also carries with it the auxiliary bolt I8 because of the flange I9 against the inner end of the bolt 6. The parts will occupy the position shown in Fig. 4 except that the retractor is not moved but remains as in Fig. 1. The lug 26 is then located underneath the outer wider portion of the bar I.

When the bolt Ii reaches the keeper receiving opening therefor, it is projected outward by spring I2, but the keeper having no opening for the passage of the auxiliary bolt I8, such auxiliary bolt remains retracted and in the position shown in Fig. 3. The outward movement of the bolt 6 carries the wider outer portion of the plate 1 beyond the lug 26, while the inward movement of the auxiliary bolt I8 and its retaining in such position when the bolt is engaged with the keeper on the door casing, locates the plate 29 at an inner position with the inclined cam 2I back of lug 26. The shoulder 9 is in front of the lug 26, whereupon the locking member 22 is turned or rocked counter-clockwise about its pivot 24 by spring 39, lug 26 being lifted into a position between the shoulder 9 and the cam 2|. Because of such interposed position of the lug 26 the bolt 6 cannot be moved inwardly by pressure against its outer end as the shoulder 9 will come against V such lug 26, which makes a positive stop against inward movement of the bolt. Thus when the door is closed and the parts are in the position shown in Fig. 3, retraction of the bolt sufficient to disconnect it from the keeper, by entrance of a knife blade or similar thin implement between the edge of the door and the door casing, is insured against.

On turning a roll-back IT, with the parts shown in the position in Fig. 3, by operating the usual door knob, either one or both the roll-backs being operated, the retractor is withdrawn moving the cup I0 and bars I4 inwardly. The bolt 6 has a limited inward movement or until the shoulder acomesto the; lug? 26 from which; itzis; spaced. at shortdistance. as. shown in, Eig; 3;. inward movement of the: cup; in, by forcingthelateral-ly turned endliv of: the bar: or: plate hto accompany such movement, withdraws the, bolt such, short; limited: distance, by which time... the cup will;

have reached; the; inclined; upper edgeof thel'oching; member 227 immediately outward: from-- the-.-

horizontal. upper edge. 2.5. withaconsequent torcing the locking member downwardly-at: its front;

end-,;. to move the: 2-6; out: of; the path. 0.25 movement, of the: shoulder 9,. whereupon the; inward movement of the retractor and the bolt. continues. until the bolt. is fully: retracted, The door may.

then be opened both the bolt 6 and the auxiliary member or bolt. 18 being withdrawnand retractedEasinEig'. 5..

When: the door is. opened. and. the rollr -back,.

or: both. of them-,rel'eased by letting loose. or a door knob which has; turned them, the several;

springs; i2; i3 and 3d: described, project: the retracton, lock bolt, and auxiliary bolt: outward to; the. positionshown in Fig; 1*.

of; the. bar 20- insures that when the outward movement of the cup. to; has progressed sufiiciently to pass: from the horizontal upper edge at. of the. locking member, the inclined cam.

edge 2! or the bar 20 will. ride upon. the lug 26, and hold it inlower'position.

In the construction described. the straight: or. linear movements of. the parts which, control, the locking and unlocking positions of the ocking: member 22., insures; against any snubbing or restriction against complete freedom of movement of'the: locking, member which may occur when the locking member is controlled by the rotary movements offltheroll-backs. Thestructure by means of which thisv improved. result is obtained. is of a novel character. It is readily fabricated and assembled and. there is retained. all' of the advantages of installation by the mere boring of a hole to receive the latching housing at the edge of a door, with, merely the. boring of a second transverse hole through the door for the knob carrying spindles which are used. The structure is compact, is economical to produce and is very practical and useful.

The invention is defined in the appended claims and is to be considered comprehensive of all forms of structure coming within their scope.

I claim:

l. A latch comprising an elongated housing, a movable latch bolt mounted at one end of the housing and projecting beyond said end, a retractor including two parallel spaced bars located within and lengthwise of the housing and a transverse retractor member connecting the outer ends of said bars located transversely of the housing, a member connected to the latch bolt extending inwardly therefrom through said transverse retractor member, at its inner end having means for connection with the retractor for movement of the latch bolt inwardly on longitudinal inward movement of the retractor, a movably mounted locking means located within the housing and passing through said transverse retractor member, interengaging means of said locking means and said bolt for locking the bolt against retraction by application of force to its projecting outer end, and means on said lockin means located in the path of movement of said transverse retractor member for releasing said locking means on inward movement of the With such out:- Ward movement, the accompanying movement? latch. bolhslidably extending through. said open-- ing;. a retractor within the: housing including; a; transversev retractor member at. the outer end.

thereof; a bar" connected to: said latch. bolt ex-l tend'm-g inwardlytherefrom. through. said: transv versei member; means: at; the inner end of; the; bar for connecting: it with said transverse retrac tor member to move. the bolt inwardly upon:

inward. movement. of the retractor member saidz bar beings slidable through said. transverse retractor;- member." for independent inward move.-

ment of said bolt.- with the. retractor atrest;. spring means between, the bolt. and retractor;

normally moving: the bolt, to its outer position, locking; means located within; the: housing and:

ZQ-movablymounted. on said housing? pass ng:

throughv said transverse retractor member', said;

bar at. its under side being recessed for:- a POI,"-

tion of? its. length and said locking means being;-

adapted: to; enter said; recess. to hold the bolt and ban against inward movement, and means;

away from said bar whereby the; bolt. may be retracted by longitudinal: inward movement of the: retractor member.

3. A structure as defined, in claim 2,; and an; auxiliary bolt; mounted: alongside said. latch, bolt for movement and inwardly'and' outwardly with respectto/ saidhousing... a. second bar connected to the auxiliary: bolt, at its inner end passin through said, transverse retractor member" underneath which said locking means; passes at: one

end; thereof, spring; means; located betw en. said auxiliary; bolt; and locking means normally proice-ting the auxiliary bolt. outwardly and, moving he: locking means. into locking position, said, second mentioned bar at its. inner end portion being widened at. its. loweredge and narrowed; at its. outer portion at. such loweredge, whereby when the auxiliary bolt is at outer position said locking means is moved into inoperative position with respect to the latch bolt.

4. In a structure as described, an elongated iousing having an opening at one end, a latch volt longitudinally movable through said opening, an auxiliary bolt alongside the latch bolt longitudinally movable through said opening, a bar connected at the inner end of each of the bolts extending into and located longitudinally of the housing, the bar connected to the latch bolt being wider at its outer than at its inner portion, and having a shoulder at its under side at the inner end of its wider portion, and the bar connected to the auxiliary bolt being wider at its rear portion than at its front portion and having an upwardly and outwardly inclined lower edge between the lower edges of the narrower and wider portions of the bar, the lower edges of the wider portions of both bars being located in the same horizontal plane, a retractor comprising upper and lower retractor bars and a transverse member connecting said bars at their outer ends, through which transverse member both of said bolt bars slidably pass, means at the rear end of the latch bolt bar for connecting it with the transverse retractor member for moving the bolt inwardly on inward movement of the retractor, a spring for normally forcing the retractor outwardly, a spring between the latch bolt and retractor for forcing the latch bolt outwar-dly, a locking member pivotally mounted adjacent its inner end on said housing and extending forwardly and lying alongside said auxiliary bolt bar and passing through said transverse retractor member, at its outer end having a laterally turned lug extending under both bolt bars, and spring means between the auxiliary bolt and said locking member normally tending to project the auxiliary bolt outwardly and turn the locking member to move said lug to bear against the under edges of said bolt bars.v

5. A locking latch comprising a housing, a latch bolt slidably mounted in and normally projecting from said housing, a retractor slidable 1ongitudinally in said housing, means for actuating the retractor, a cross head fixed to said retractor, an extension on said latch bolt slidably extending through and guided by said cross head, an auxiliary bolt adjacent said latch bolt, means for retracting said latch bolt and said auxiliary bolt by movement of said retractor, independent means for thrusting said latch bolt and auxiliary bolt outward, a locking member movably mounted in said housing and extending through and guided by said cross head and movable into locking engagement with said latch bolt, and camming means on siad cross head engageable with said locking member.

6. The elements of claim 5 combined with an extension on said auxiliary bolt passing through and guided by said cross head.

7. 'I'he'elements of claim 5 in which said housing has a contracted portion and a portion of said locking member lies within the contracted portion and is guided by a Wall thereof.

8. The elements of claim '7 in which said locking member is pivoted in said housing and that portion which is guided by the said wall of the housing is a lateral extension from said pivot.

9. In a latch structure adapted to cooperate with a strike plate, said latch structure having a housing, a latch bolt, a retractor and roll-backs adapted to reciprocate said retractor axially of said housing, said latch bolt being adapted for reciprocation independently of said retractor, the improvement therein comprising: a transverse member on the end of said retractor adjacent said latch bolt; a locking member pivotally mounted to said housing; means for urging said locking member into engagement with said latching bolt; means for disengaging said locking member-from said latch bolt when said latch bolt is extended and disengaged from said strike plate; a cam on said locking member; a bar on said transverse member adapted to engage said cam on said locking member and pivot said looking member out of engagement with said latch bolt when said retractor is moved toward said roll-backs.

- 10. In a latch structure having a housing, a latch bolt, a retractor and roll-backs adapted to reciprocate said retractor axially of said housing, said latch bolt being adapted for reciprocation independently of said retractor, the improvement therein comprising: a transverse member on the end of said retractor adjacent said latch bolt; a locking member pivotally mounted to said housing adjacent said roll-backs; an auxiliary bolt; means for urging said locking member into engagement with said latch bolt; a cam on said auxiliary bolt for disengagingsaid locking member from said latch bolt when said auxiliary bolt is extended; a cam on said looking member; a bar on said transverse member adapted to engage said cam on said locking member and pivot said locking member out of engagement with said latch bolt when said retractor is moved toward said roll-backs.

HERBERT QUIGLEY. HERBERT YOUNG.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Re. 22,622 Voight Mar. 20, 1945 1,876,081 Schlage Sept. 6, 1932 2,369,873 Voight Feb. 20, 1945 2,420,083 Lickteig May 6, 1947

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