US3492038A

US3492038A - Double-acting door pull lock

Info

Publication number: US3492038A
Application number: US691595A
Authority: US
Inventors: Ernest L Schlage; Peter C Fu
Original assignee: Schlage Lock Co LLC
Current assignee: Schlage Lock Co LLC
Priority date: 1967-12-18
Filing date: 1967-12-18
Publication date: 1970-01-27
Anticipated expiration: 1987-01-27

Description

E. L. SCHLAGE ETAL 3,492,038

I DOUBLE-ACTING DOOR PULL LOCK Jan. 27, 1970 2 Sheets-Sheet 1 Filed Dec. 18, 1967 w GI wk mw vm Mm R INVENTORS ERNEST L. SCHLAGE PETER C. FU

T/MM

} ATTORNEYS Jan. 27,-19.70 E. 1.. 'SCHLAGE ETAL 3,492,038

DOUBLE-ACTING DOOR PULL Lo'x Filed Dec. 18, 19s? 2 Sheets-Sheet 2 FIG. 4

Il-Qw- 3 F G 5 INVENTORS ERNEST L. SCHLAGE PETER C. FU'

I BY [55 Ha o F Z VZ M ATTORNEYS United States Patent 3,492,038 DOUBLE-ACTING DOOR PULL LOCK Ernest L. Schlage, Burlingame, and Peter C. Fu, San Mateo, Calif., assignors to Schlage Lock Company, San Francisco, Calif., a corporation of California Filed Dec. 18, 1967, Ser. No. 691,595 Int. Cl. Ec 19/00, 1/08; E05b 15/02 US. Cl. 29278 11 Claims ABSTRACT OF THE DISCLOSURE The combination of a spring-urged, double-bladed swing catch and a deadbolt mounted for projecting from the edge of a door between the vertical edges of the opening in a strike on a jamb. The catch blades are pivoted on the forward end of the deadbolt and include rearwardly extending barbs which prevent separation of the strike from the deadbolt.

BACKGROUND OF THE INVENTION This invention relates to a maximum security door pull lock, and more particularly to the combination of a manually actuated deadbolt and a double-acting, Pullman-type friction catch.

Deadbolt locks and friction catches, generally, have been used individually and in some instances have been combined into a single assembly. In all conventional combinations of a deadbolt and friction catch of which applicants are aware, each of the two components operates independently and performs only the function associated with its particular structure. In such combination, when the catch is operative, the bolt is retracted and performs no function and when the bolt is projected through the strike opening, the catch is incapable of performing useful functions. In addition, prior efforts to combine a deadbolt lock and catch have resulted in impairment of the security of the lock, e.g., by weakening the bolt, or in a bulky and cumbersome construction.

SUMMARY OF THE INVENTION A door pull lock embodying this invention includes a double-acting catch which is self-centering and functions to prevent the door from rattling with respect to its associated jamb or stop. The catch comprises a pair of opposed, pivoted members which yieldably engage the opposite edges of the strike plate opening on the jamb to hold the door against accidental opening. When the bolt is retracted, the catch frictionally engages the strike and may be unlatched by merely pulling the door, and when the bolt is thrown to the projecting position through the strike opening, the catch moves to within the door jamb recess beyond the strike and positively prevents withdrawal therefrom through the strike opening until the lock is released. In one form the pressure of engagement is adjustable, so that a harder or lighter pull on the door may be required to disengage the catch, as desired.

Additionally, the catch assembly positions the door with respect to the strike plate so that the deadbolt, mounted in the same housing for throwing along the same longitudinal axis, may be projected accurately through the strike plate opening. The bolt is not weakened to any noticeable extent by mounting the catch on its forward end. Provision is also made for positively preventing forcible withdrawal of the projected bolt through the strike plate opening by unauthorized means.

It is therefore an object of this invention to provide a novel catch which yieldably holds a door or like closure in closed position and is adjustable to vary the amount of pull required to open the door.

door pull lock combining a deadbolt and yieldable catch for readily obtaining different desired degrees of security including an extremely high degree of security.

Other objects and advantages of the invention will become apparent from the following description of preferred embodiments of the invention.

DESCRIPTION OF THE FIGURES FIG. 1 is an exploded perspective view of one preferred embodiment of the door pull lock of this invention;

FIG. 2 is a horizontal sectional view, with parts broken away to illustrate detail, of the embodiment of FIG. 1 mounted in a door with its associated jamb;

FIG. 3 is a vertical sectional view, with parts broken away for purposes of clarity, of the embodiment of FIG. 1 mounted and positioned as in FIG. 2;

FIG. 4 is a horizontal sectional view of the embodiment of FIG. I mounted in a door that is in a partially closed position such that the catch is in engagement with the ramp of the strike plate;

FIG. 5 is a horizontal sectional view, with parts broken away, of the embodiment of FIG. 1 with the bolt thereof in the thrown or locked position;

FIG. 6 is a fragmentary sectional view of a modified form of means for adjusting the spring force of the catch in the door pull lock of this invention.

DESCRIPTION OF PREFERRED EMBODIMENTS In detail, referring to FIGS. 1 and 2, a preferred embodiment of the lock of this invention comprises a tubular housing 3 having a faceplate 4 with a central opening 5 therein, secured in a conventional manner to the front end of said housing. Projecting rearwardly from the rear end of housing 3 is an elongated anchor 6 carrying a flange 7 (FIG. 2) at its inner end which, together with a washer 8, is stapled against the inner side of the closed rear end of housing 3 to secure said anchor in place.

SIidably mounted on the uper edge of anchor 6, and extending through an opening in the rear end of housing 3, is a retractor bar 11. An opening 13 in the rear end of bar 11 is provided for engagement with the outer end of a retractor crank 14 having a boss 15 (FIG. 1) journalled in anchor 6, thereby supporting said crank for swinging toward and away from housing 3. A cross slot in boss 15 receives the edges of a flat spindle bar 16, which is operatively connected to the cylinder of a conventional pin tumbler lock 17. A thumb turn 18, mounted on the side of anchor 6 opposite lock 17, is also operatively connected to spindle bar 16. By either turning the cylinder of lock 17 with a key-or turning thumb turn 18, spindle bar 16 rotates crank 14, thereby projecting retractor bar 11 toward faceplate 4 or retracting the same to the FIG. 1 position.

The lock of this invention is adapted to be mounted ina door or like closure 19 (FIG. 2) with housing 3 received in a cylindircal bore 22 and faceplate 4 mortised into and attached by screws to the outer edge of said door. Lock 17 and thumb turn 18 are mounted on opposite faces of door 19 and extend into a cross bore 23. The unit is secured in place by a pair of screws 24 extending through the escutcheon with a pair of posts 25 extending from lock 17 through openings in anchor 6.

Slidably supported in housing 3 is a generally cylindrical bolt 26, the rear end of which is slotted and connee-ted, as by cross pins 27 (FIG. 1), to the forward end of retractor bar 11, which has apertures 28 for receiving said pins. The forward end portion of bolt 26 is formed with flats 31 (FIGS. 1, 2) on its opposite sides so that it is narrower in width than the rear end of said bolt.

As crank 14 is rotated forwardly by either thumb turn 18 or lock 17, it throws retractor bar 11 forwardly and the forward end portion of bolt 26 outwardly through the opening in faceplate 4. A strike plate 33 is mounted in the customary manner on the jamb or other closure member 34 associated with door 19 (FIG. 2) and when the door is closed with respect to the jamb (FIG. 5), the forward end portion of bolt 26 extends through the opening 32 in said strike to the projected locking position. Preferably, the width of opening 32 between the laterally spaced side edges 29 is only slightly larger than the width of the forward end portion of bolt 26 between flats 31, so as to receive said bolt freely but with negligible lateral play (FIG. 5).

Bolt 26 has a central, longitudinally extending through bore 36 (FIG. 2) including a slightly enlarged bore portion 37 extending substantially through the rear half of said bolt. Received in bore portion 37 and secured to the rear end of housing 3 is an elongated guide member .38 (FIGS. 2, 3) of generally U-shaped cross-section. The upper edges of said guide member embrace the upwardly projecting portion 41 (FIG. 3) of a spring seat, 42, the lower portion of which is slidably received within guide member 38. A helical compression spring 43 abuts at its rear end with spring seat 42 and extends forwardly therefrom through guide member 38 and into the forward portion of bore 36 (FIG. 2). Extending through the forward portion of spring 43 -is a tubular, externally threaded slide 44 carrying an internally-threaded sleeve 39 vhich provides a rearward facing shoulder that abuts the foreward end of said spring. Slide 44 is connected to spring seat 42 by a pin 45 threaded into the latter and the forward end of said pin is telescopically received within the bore of said slide. A head 46 on pin 45 abuts a forwardly directed shoulder 30 at the rear end of slide 44 o prevent its withdrawal from said slide. A catch, gener- .lly designated 47 (FIG. 1) is carried by the forward rid of slide 44 and norm-ally projcts forwardly outwardly f faceplate 4 of housing 3 and toward strike plate 33.

Catch 47 comprises a pair of partially overlapping, opposed, generally sectoral catch members or blades 48 having their rear end portions received in a corresponding pair of vertically offset grooves 49 (FIGS. 1, 2, 4) formed in the forward end portion of bolt 26 and opening outwardly of flats 31 and into bore 36. Each blade 48 of said pair is in the form of a modified sector of approximately 90 degrees having a curved nose portion 51, which normally projects forwardly of faceplate 4 and laterally of strike edges 29, and a transversely extending rear edge 59 joining said nose portion at a vertex. Each blade 48 is pivotally connected at said vertex to one of the forward corners of bolt 26 for horizontal swinging in a groove 49 by a pin 50 (FIGS. 1, 4). A pair of overlying links 52 (FIG. 2) extend forwardly from a common pivot pin 78 in the forward end of slide 44 to a pair of pivot pins 79 each of which connects one of said links to a corresponding one of said blades, thereby connecting said blades for swinging together in opposed relation. The opposed, overlapping surfaces of blades 48 may be recessed, as at 53 (FIG. 2) to accommodate the forward ends of links 52 and pins 79.

In this manner, spring 43 yieldably urges blades 48 oppositely outwardly to a projected position, limited by engagement of head 46 with shoulder 30 on slide 44. In this position nose portions 51 of blades 48 extend divergently forwardly and laterally outwardly of fiats 31, such that the combined lateral extend of blades 48 is greater than the width of strike opening 32, i.e., the lateral spacing between vertical edges 29 thereof.

Thus, when the door is moved from an open toward a closed position in its associated jamb 34 (FIG. 4) the .into housing 3 to a retracted position in which they will slide across the face of strike 33. When the door has been swung to the closed position against the stop 55 (FIG. 2) nose portions 51 are urged forwardly and laterally outwardly by spring 43 into yieldable engagement with the vertical edges 29 of strike plate opening 32.

Since the gap between the edge of the door and its associated frame may vary depending on the original installation, aging conditions and the like, members 48 of catch 47 may project into opening 32 in strike 33 to a greater or lesser degree than shown in FIG. 2, wherein the gap is average or normal. Preferably the strike plate 33 employed with the lock of this invention is provided with a pair of opposed, parallel flanges 21 (FIGS. 1, 2) extending from edges 29 inwardly of jamb 34 (i.e., away from the housing 3 in door 19). Where the gap between the door and jamb is relatively narrow, nose portions 51 of the catch members project further into opening 32 and yieldably engage flanges 21 so as to maintain the longitudinal axis of housing 3 centrally located with respect to the strike opening.

In an installation such as illustrated in FIG. 2, blades 48 function to yieldably hold the door against a properly positioned stop 55. Furthermore, in the absence of a stop, such as in a double swinging door, catch 47 effectively prevents rattling of the door by virtue of the yieldable engagement of blades 48 with the opposing edges of or flanges on strike plate opening 32.

Since blades 48 are mounted and swing symmetrically with repect to the longitudinal axis of housing 3, said catch also functions to properly center bolt 26 with respect to opening 32 of strike plate 33 so that it readily enters said opening when thrown to its projected position (FIG. 5). The pressure of engagement of catch members 48 with the vertical edges of strike plate opening 32 may be varied by adjustment of the position of sleeve 39 on slide 44. Spring pressure is increased by screwing sleeve 39 rearwardly to compress spring 43, and, conversely, is decreased by threading sleeve 39 forwardly. Access to sleeve 39 is provided through grooves 49 and said sleeve may be rotated by inserting a tool in notches 40 (FIG. 1) therein. In the described manner, catch assembly 47 is adjustable to change the amount of pull on a door required to disengage said catch from the strike plate 33.

When door 19 is in the closed position and bolt 26 is fully thrown, catch 47 performs a further function which is to positively prevent withdrawal of the forward end portion of said bolt and said catch through strike opening 32 by unauthorized methods. One method employed by burglars to gain access through a bolted door is to spread opposite sides of the door frame, by jacking them apart for example, sufficiently to withdraw the projected bolt from the strike opening. Such method, if carefully practiced, leaves no evidence of entry on the door, frame, or lock. The lock of this invention is specially constructed so as to prevent such unauthorized entry or at least create visible damage if it is attempted.

To this end, a vertically extending pin 56 (FIGS. 2, 3) having chamfered ends, is slidingly received in a narrow bore 57 (FIG. 3) extending vertically through spring seat 42. With bolt 26 in the retracted'position, the lower end of pin 56 rests on the upper inside surface of guide 38, and the upper end of said pin projects upwardly into an opening 5 8 (FIG. 3) formed in the upper wall of retractor bar 11. Upon initial forward movement of retractor bar 11 and bolt 26 relative to housing 3, spring seat 42 is carried forwardly therewith by pin 56 in opening 58 until said spring seat engages a pair of rearwardly facing shoulders 61 (FIGS. 3, 5) formed in the upper portion of guide 38 intermediate its ends. During forward movement of spring seat 42 to this point, which is approximately one-half the throw of bolt 26, spring 43, slide 44 and links 52 are moved forwardly with bolt 26 and catch members 48 are maintained substantially in their projected positions. At the point of engagement of shoulders 61 with spring seat 42, pin 56 is pushed downwardly by the camming action of the rear edge of opening 58 on the chamfered upper end of said pin, and the lower end thereof enters an opening 62 formed in the bottom of guide member 38 (FIG. 3). Spring seat 42 is thus precluded from further forward movement and is released from its connection to retractor bar 11.

Since slide 44 and the common pivot 78 of links 5-2 are held stationary by the connection of pin 45 to guide 38, further forward movement of bolt 26 carrying pivot pins 50 causes the nose portions '51 of members 48 to be swung oppositely inwardly into grooves 49 in the forward end of the bolt (FIG. 5). The dimensions of the parts are such that members 48 are swung through an angle slightly greater than 90 degrees in which position the corners 60 opposite nose portions 51 and pivot pins 50 project laterally outwardly of bolt 26 thereby presenting rearwardly facing shoulders or barbs in opposed relation to the corresponding edges of flanges 21 on strike 33. The rearwardly directed surfaces of comers 60 may be cut normal to the longitudinal axis of bolt 26 so as to present fiat surfaces engageable with the edges of flanges 21 (or with the back face of strike plate 33 adjacent edges 29 in a form without flanges) should unauthorized withdrawal of bolt 26 be attempted. Since blades 48 cannot be pivoted in the reverse direction to retract corners 60 except upon retraction of bolt 26 by means of a key in the cylinder of lock 17 or by turning thumb turn 18, the rearwardly facing barbs define-d by said corners positively prevent withdrawal of catch 47 and the forward end portion of bolt 26 through strike opening 32 and provide a lock of maximum security.

Retraction of bolt 26 by either rotation of the cylinder of lock 17 or turning of thumb turn 18 reverses the above described operations of the parts. During the first portion of the rearward movement of bolt 26 from the projected position of FIG. 5, catch members 48 are swung forwardly thereby retracting corners 60 inwardly to permit withdrawal of the forward end portion of said bolt through strike opening 32. At approximately the midportion of such movement the rear pin 27 on bolt 26 engages the upper portion 41 of spring seat 42 causing it to move rearwardly and camming pin 56 upwardly by engagement of the lower chamfered end of said pin with the rear edge of opening 62 in guide member 38. The upper end of pin 56 thereby enters opening 58 in retractor bar 11 and the parts are thereafter returned to the retracted position of FIGS. 2, 3.

The modification of FIG. 6 includes a bolt 63 receiving a guide member 64 which guides a spring seat 65 connected by a pin 66 to a hollow slide 67 for relative movement longitudinally of bolt 63, and catch blades 68 pivotally connected to slide 67 by links 69, all such parts corresponding to similar parts of the embodiments of FIGS. 1 and 2. The rear ends of links 69 are pivotally connected to the bifurcated forward end portion 71 of slide 67 by a common pivot pin 72. Also slidably received in guide member 64 is the lower portion of an upstanding tab 74 apertured to receive the forwardly projecting portion of spring seat 65 and pin 66. The upper portion of tab 74 threadedly receives the rear end portion of an adjusting screw 75 extending longitudinally through a bore in bolt 63 for rotation therein and secured against axial displacement by a stub screw 76 projecting into an annular groove 77 formed in screw 75. A helical compression spring 73 extends between the lower portion of tab 74 and the enlarged forward end portion 71 of slide 67, and the axial extent of spring 73 may be adjusted by moving tab 74 forwardly or rearwardly through rotation of screw 75. In such manner, alternate means is provided for adjusting the amount of spring force applied to resiliently mounted catch blades 68.

In both embodiments of the lock, when the bolt (26 in FIGS. 1, 2; 63 in FIG. 6) is thrown to the projected position through the opening of the strike plate, security is further increased by the fact that the bolt and parts internally of it together provide substantially a solid cylindrical post of very high strength which will withstand extreme abuse.

It is to be understood that the claims appended hereto are intended to cover all changes and modifications of the examples herein chosen for purposes of disclosure which do not depart from the spirit and scope of the invention. For example, it is obvious that the catch and deadbolt housing may be mounted in the jamb and the strike plate on the door, or each may be mounted on one of a pair of double swing doors, or the lock may be applied to a window or other closures.

We claim:

1. In a door lock of the type having a lock housing and a strike adapted to be mounted in opposed relationship to said housing along an operating axis, the improvement comprising:

(a) said strike having an opening therein defined by a pair of laterally spaced, opposed side edges;

(b) a pair of catch members pivotally mounted in said housing for opposed swinging movement from projected positions extending forwardly outwardly of said housing toward said strike and laterally of said axis to a greater extent than said side edges to retracted positions extending rearwardly inwardly of said housing and laterally of said axis to a lesser extent than said side edges;

(c) spring means urging said members toward said projected positions;

(d) means connecting said members for swinging together.

2. The improvement of claim 1, including:

(e) opposed flanges on said strike extending from each of said edges away from said housing engageable by the laterally outwardly directed surfaces of said members.

3. The improvement of claim 1, including:

(e) means for increasing and decreasing the force applied by said spring means to said members.

4. The improvement of claim 1, including:

(e) an elongated deadbolt having a forward end portion of narrower Width than the spacing between said side edges and mounted in said housing for movement along said axis between a retracted position within said housing and a projected position in which said forward end portion extends forwardly through said opening.

5. The improvement of claim 4, in which:

(f) said catch members are pivotally mounted on and carried by said forward end portion of said deadbolt.

6. The improvement of claim 5, including:

(g) rearwardly directed projections on said catch members, and

(h) means for swinging said projections to positions extending laterally outwardly of said forward end portion when said deadbolt is in said projected position.

7. A door pull lock, comprising:

(a) a manually projectable elongated deadbolt having a forward end portion of predetermined width less than the spacing between the opposed side edges of the opening in a strike which it is adapted to enter during forward movement from a retracted to a projected position;

(b) catch means supported on said forward end portion for movement therewith through said opening upon movement of said deadbolt to said projected position, including opposed rearwardly directed shoulders, and

(c) means for projecting said shoulders outwardly of said forward end portion into opposed relationship to portions of said strike adjacent said side edges of said opening for preventing unauthorized withdrawal of said deadbolt through said opening;

(d) said catch means including spring-urged nose portions projecting forwardly and outwardly of said forward end portion for resiliently engaging said side edges when said deadbolt is in said retracted position.

8. A door pull lock, comprising:

(b) catch means supported on said forward end portion for movement therewith through said opening upon movement of said deadbolt to said projected position, including opposed rearwardly directed shoulders;

(d) means pivotally connecting said catch means to said forward end portion; and

(e) means for retaining said shoulders within the lateral confines of said forward end portion when it is in said retracted position and responsive to movement of said deadbolt to said projected position for so projecting said shoulders.

9. A door pull lock, comprising:

(a) a manually projectable elongated dead-bolt having a forward end portion of predetermined width less than the spacing between the opposed side edges of the opening in a strike which is is adapted to enter during forward movement from a retracted to a projected position;

(d) said catch means including a pair of opposed, sectoral blades pivotally mounted at spaced points on said forward end portion for opposed swinging movement from projected to retracted positions when said deadbolt is in said retracted position;

(e) spring means urging said blades toward said projected positions;

(f) a curved nose portion on each said blade at a corner remote from said point; and

(g) said nose portion projecting forwardly and laterally outwardly of said forward end portion for resiliently engaging said side edges.

10. The door pull lock of claim 7, including:

(e) a compression spring having one of its ends yieldably urging said catch means forwardly and outwardly;

(f) a spring seat in abutment with the other end of said spring;

(g') means for adjusting the spacing between said ends for changing the pressure of resilient engagement of said nose portions on said edges.

11. The door pull lock of claim 8, including:

(f) a slide extending longitudinally of said deadbolt;

(g) means for connecting said slide for movement with said deadbolt during the initial portion of the movement of said deadbolt from said retracted position toward said projected position;

(h) means holding said slide against movement during a terminal portion of the movement of said deadbolt to said projected position; and

(i) means connecting said slide and said catch means for pivoting said blades and thereby so projecting said shoulders during said terminal portion of said movement.

References Cited UNITED STATES PATENTS 1,192,449 7/1916 Ottinger 292-491 2,446,206 8/1948 Beckman 292-34112 2,668,073 2/1954 Collar et al. 292192 3,413,026 11/1968 Kendrick et al. 292192 X I KARL BELL, Primary Examiner US. Cl. X.R.