US3608940A - Slidable door safety lock - Google Patents

Slidable door safety lock Download PDF

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US3608940A
US3608940A US3608940DA US3608940A US 3608940 A US3608940 A US 3608940A US 3608940D A US3608940D A US 3608940DA US 3608940 A US3608940 A US 3608940A
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elongated
extended
latch
members
telescoping
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Francis B Mueller
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Francis B Mueller
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    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05BLOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B65/00Locks or fastenings for special use
    • E05B65/08Locks or fastenings for special use for sliding wings
    • E05B65/0888Locking bars
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/28Extension link
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/45Rod clamps
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/65Braces

Abstract

A sliding door security lock of telescoping members limited in movement in a contracted direction, one end being attached to the frame of the sliding door itself and the other end being attached to the doorjamb or a second door in the doorjamb. Both attachments are releasable, one by retracting one member from one member when the door is closed and the other by angularly moving the other member when the one member is retracted therefrom. The one member is latched by a pivoted coaxial keeper in its telescoping position and the latch is held closed by the other member when the door is open.

Description

United States Patent Francis B. Mueller 4917 Chase Ave., Downers Grove, 111. 60515 Oct. 30, 1969 Sept. 28, 1971 [72] inventor 2| App]. No. [22] Filed [45] Patented [54] SLIDABLE DOOR SAFETY LOCK 262, 305, 338, 278', 70/90, 94, 95; 49/449, 450; 287/58 CT; 248/354 R; 21 1/105.3, 123
[56] References Cited UNITED STATES PATENTS 534,923 2/1895 Shout 292/262 1 ,601,524 9/ 1926 Gibbons 292/305 Primary Examiner- Robert L. Wolfe Attorney-Harbaugh and Thomas ABSTRACT: A sliding door security lock of telescoping members limited in movement in a contracted direction, one end being attached to the frame of the sliding door itself and the other end being attached to the doorjamb or a second door in the doorjamb. Both attachments are releasable, one by retracting one member from one member when the door is closed and the other by angularly moving the other member when the one member is retracted therefrom. The one member is latched by a pivoted coaxial keeper in its telescoping position and the latch is held closed by the other member when the door is open.
PATENIED was Ian SHEU 1 [1F 3 FEB! FRANCIS B. MUELLER PATENTED SEP28 1971 SHEET 3 OF 3 FRANCIS B. MUELLER You,
SLIDABILE DOOR SAFETY LOCM BACKGROUND OF THE INVENTION Sliding closures are used in modern access openings of which slidable glass panel doors are an example. Other examples include specially designed fire doors, windows, room cutoff panels, and related enclosures. Generally, the glass is supported in frames that are mounted for movement in channel members of a doorjamb. Normally the usual key-operated locks are used with these types of structures and it is the practice where plate glass or Thermopane glass panels of relatively large areas are used in the doors, the locks are located in narrow frame members rather than the glass itself. Experience has taught that the locks employed can be forced by the pry of a crowbar or wedge and can be disengaged by forcing steel chisels through the outer frames at the position of the lock.
Several forms of safety locks for sliding doors have been developed as with fingers engageable with selected notches in the top edges of the panels in their closed position which is secured by an ordinary key-operated cylinder lock. However, the lock once set locks the door in a fixed position and in many instances have vulnerable elements exposed. This type of locking a door in particular positions also has the disadvantage of being somewhat complicated and depends on the use of a key each time the door is opened a little farther and its location is generally along the top or bottom of the framework for the sliding panels. No provision is made for a readily available, partial opening of the panels under locked conditions.
Various forms of disengageable safety locks are available for hinged doors such as chains, bars, etc. in difierent arrangements. It is common to use a plain piece of wood or pipe to fit between the frame of a window and one of the movable sashes. In one embodiment a telescoping member is used which can be locked to a desired length by a setscrew. Such inserted members can be pried or lifted loose by fiat tools inserted through joints and cracks in the frames and are not foolproof. In brief no satisfactory sliding-door lock having foolproof characteristics is available. The instant invention overcomes these and related problems.
SUMMARY OF THE INVENTION The instant invention concerns a strong safety lock for sliding structures that can be used in any attitude, is foolproof, provides variable partial opening of the structure for ventilation purposes, cannot be opened or unlocked in its partially open position and requires that the structure be fully closed before the lock can be opened. The lock of this invention is constructed of readily fabricated, simple, yet rugged parts and is not unsightly.
The safety lock of this invention is easily installed, has the appearance of a handle or guard rail on the structure door and in fact one of the parts, when the lock is not in use can function as a handle for a sliding door, while the other part can be detached, leaving the glass pane of the door free of obstructions. The safety lock of this invention cannot be half locked or placed in a position where it appears to be locked when in fact it is not locked. If the detachable member is held in a position across the panel of glass, the door is looked, a condition that can be determined even in a dimly lighted room or from light coming through the panel from the outside only. Furthermore, the lock of this invention can without modification be used on a single sliding door or a pair of doors which operate or overlap within the same opening.
More particularly the safety lock of this invention comprises a rod member with a hook at one end and a tubular section at the other end. A keeper is provided and adapted to be affixed to a stationary wall or the frame of a second door which closes in the other direction. The keeper has an eye adapted to be engaged by the hook end of the rod. A swing bolt assembly is provided with a bracket for attachment to the door side frame or to a stationary frame, as desired. The bracket has a stationary slotted portion and a beveled abutment. The bolt is provided with a pin that engages the slot allowing the swing bolt to reciprocate longitudinally in a plane parallel to the plane of movement of the sliding door or doors and swings in an are away from the door and out of axial alignment with the rod member. The extended end of the bolt is adapted to be telescopingly engaged within the tubular section of the rod, when the latter is axially aligned therewith within the limits of the movement of the pin in the slot. The bolt carries a latch member within its extended end that is pivotally mounted on an axis substantially perpendicular to the plane of movement of the door and also perpendicular to the axis of the pin on the bolt. The opposite or pivotable end of the latch member is adapted to engage the abutment of the bracket member in the locked position and be pivoted upwardly to an unlocked position where it overrides the abutment and allows the bolt to move out of telescoping relationship with the tubular section of the rod member. section of the The telescoping relationship of the rod and bolt allows limited opening of the door, for ventilation, and at the same time encompasses the latch member so that it cannot be pivoted above the abutment. To secure the lock it is only necessary to close the door or panel completely, insert the hook end of the rod into the keeper, swing the bolt assembly into axial alignment with the tubular section of the rod, raise the latch, slide the bolt away from the rod to the limits of the pin in the slotted bracket and then mate the bolt with the tubular section and slide it therein. In this last step the latch automatically falls into place and engages against the abutment so that the bolt cannot disengage the tubular section. The door and frame are now tied together within the overlapping limits of the tubular section and the bolt. Reversal of these steps unlocks the lock.
The safety lock of this invention can be used for any type of sliding panel structure such as sliding doors, sliding windows, double-hung windows and single-hung windows. When using the device of this invention for a window lock, the mounting would be along the jamb. Other embodiments of the invention will become apparent as the description proceeds.
DESCRIPTION OF THE DRAWINGS An illustrative nonlimiting embodiment of this invention is shown in the drawings wherein:
FIG. l is a plan view of a wall showing sliding glass door panels with the safety lock of this invention in the locked position;
FIG. 2 is a fragmentary partial cross-sectional top view taken along the lines 22 of FIG. ll of the safety lock of this invention in the locked position;
FIG. 3 is a fragmentary partial cross-sectional side view of the lock in the position shown in FIG. 2;
FIG. 4 is a fragmentary view like FIG. 2 showing the lock in the locked position and one or both of the doors in a partially opened position;
FIG. 5 is an exploded perspective view of the swing bolt assembly;
FIG. 6 is a fragmentary perspective view of the safety lock of this invention in the locked position and the door or doors in closed position as shown in FIGS. 1, 2 and 3;
FIG. 7 is a fragmentary perspective view of the safety lock in the unlocked position with the swing bolt assembly unlatched and extended to free the rod member.
THE PREFERRED EMBODIMENT Referring to FIG. 1 there is shown a representative wall or frame with a pair of glass panel doors 112 and 14 illustrating sliding structures, one or both of which are horizontally slida ble within a suitable framework or jamb 116 having tracks (not shown) along which the horizontal frame members 18 and 20 of the doors for example, are guided. The panel 12 has a pair of upright frame members 22 and 24! forming a unitary structure, and similarly the panel M has a pair of upright frame members 26, one of which would be behind the upright M in the indicated position of the panels. Attached between the frame member 24 of the panel 12 and the frame member 26 of the panel 14 is the safety lock 30 of this invention, in this instance shown in its locked position with the parts in their extended position and with the panels completely closed.
Referring to FIGS. 2 and 3 an example of the detailed structure is shown wherein the safety lock 30 consists of the keeper member 32 having the baseplate 34 with the corner flange 36 fitted to and around the corner of the frame member 26 of the panel 14 here indicated to be a Thermopane glass door. Any securing means such as the screws 38 can be used to fasten the keeper member 32 to the frame and suitable holes (not indicated) would be provided in the baseplate to accommodate the screws.
The keeper member 32 has the eyelet or eye member 40 defining the opening 42 which is generally frustoconical in configuration being larger on the inside periphery 44 than the outer periphery 46 so as to receive and retain the hook member 48 of the rod member 50.
The rod member 50 is generally tubular in configuration having an internal bore 52 extending part or all of its length with the hook base 54 forming an end closure. The hook 48 is integral with the base 54 and can be welded within the rod 50 or attached by means of the rivet 56 extending through suita ble aligned bores in these members. The hook 48 is adapted to engage the opening 42 with the narrow curved portion 58 in the inside of the hook providing limited plan within the keeper, yet allowing easy removal when the rod 50 is swung in the direction of the arrow 60. This action is facilitated by the frustoconical shape of the opening 42. The hook 48 may be so dimensioned that the screw 38 cannot be removed when the hook is in place.
The other end of the safety lock 30 has the bracket member 62 similar to the baseplate 34, encompassing the corner of the frame member 24 of the Thermopane glass panel 12, and held thereto by means of the screws 64 and 66 in a manner similar to the keeper 32. The bracket 62 has the horizontally extending cleat or flange 68 provided with the elongated slot 70. The slot extends through both sides of the cleat 68 and is oriented in the general direction of the movable structure.
The cleat 68 has the lock member or abutment 72 extending axially of the slot 70 and provided with the upwardly beveled end 74 extending transverse the axis of the slot 70 and sloping upwardly toward the keeper 32 when these parts are mounted on the respective frame members. The details of the cleat 68 are shown in FIG. 5. The lock member 72 is seen to provide a fixed wall or abutment under the plane of the cleat 68 for purposes to be described.
The bracket 62 serves as a permanent sliding hinge mount for the swing bolt assembly 76 comprising an elongated rod 77 with one end 78 adapted to be telescopingly received in the bore 52 of the rod 50 with a close-fit clearance as indicated at the space 80 and having a chamfered edge 82 to facilitate its insertion therein. The swing bolt 76 is cutout or offset to form the elongated side channel or notch 84 (better shown in FIG. defined by the transverse or radial wall 86 at the outer end, the longitudinal wall 88 which extends axially of the bolt and the beveled end wall 90 (see FIG. 8) at the inner end nearest the bracket 62.
The telescoping end 78 of the swing bolt or rod 77 may be generally cylindrical to match the shape of the bore 52 and the other end 94 is generally reduced in cross section and flattened on all four surfaces, having an offset beveled edge 92 on the bottom and intermediate the walls 86 and 94, and the chamfered edge 96 at the juncture of these surfaces. Thus, the flattened or squared end 94 has the flat bottom surface 98 which rests upon the top flat surface 100 of the cleat 68, and also upon the lock or extension member 72. The flat end 94 carries the pin 102 near its terminus. The pin 102 extends through the slot 70 and is engaged therein by the head 104. The head 104 has a diameter larger than the slot 70 and engages against the flat undersurface 106 of the lock member 72 in a sliding relationship while maintaining the surface 98 against the surface 100, in a bearing relationship.
The offset 84 provides a recessed housing for the latch member 1 10. This latch has the cross bore 1 12 at one end with an enlarged counterbore 114 concentric therewith to receive the enlarged head 116 (FIG. 2) of the pivot pin 118 that extends through the bore 120 through the rod 77 at the wall 88.
The pivoted end of the latch member 110 is rounded as at 122 or otherwise spaced from the radial wall 86 of the offset 84 so as to be pivotally mounted on the pivot pin 118 and has a beveled end 124 that matches with and engages upon the oppositely beveled surfaces 74 and of the cleat 68 and the swing bolt 76, in a manner to be described.
Referring first to FIGS. 2 and 3, the safety lock of this invention is shown in the locked position wherein the rod 77 extends a short distance into the tubular portion 52 of the rod member 50 when moved to the limits of the slot 70 in which position the pin 102 is against the end of the slot as indicated at the contact line 126 in FIG. 3. The abutting surface 90 of the rod 77 has been moved into planar alignment with the abutting surface 74 of the lock member 72, extending thereunder from the cleat 68. This allows the latch member to be pivoted downwardly or fall by gravity into the locked position shown with its beveled end 124 engaged upon the coplanar surfaces 74 and 90. The sliding structure, e.g. the door 14, is in the completely closed position with the frame 26 against the jamb 16. This relationship of the parts of the lock is also shown in FIG. 6.
The door 14 is however free to be opened slightly for ventilation, if desired, because of the telescoping relation of the rods 50 and 77. The extent of such opening is a matter of choice and would normally be insufficient to allow the entry of an intruder, e.g., 4-5 inches. The sliding of the door 14 to the partially opened but still locked position causes the parts to assume the relationship shown in FIG. 4 where the space 128 represents the relative amount of such opening. It is to be observed that the tubular portion 52 of the rod 50 has passed over the latch member 110 and rod 77, completely encompassing and hiding same and making it impossible to unlatch. The extend of this partial opening of the door is limited by the abutment of the edge 130 of the rod 50 against the front surface 63 of the L-shaped flange 62 or the side flange 63 as indicated in FIG. 4. The extent of this sliding, but locked relationship of the door 14, can be represented by the distance between the lines A-B which will of course be equal to the space 128. This opening is independent of the length of the slot 70.
It will be also observed that in this position of the lock the rod 77 is still in its right-hand or extended position in relation to the slot 70 and that the pin 102 is in contact with the slot at 126. The beveled surface 92 of the rod 77 is also spaced from the beveled surface 74 of the cleat 68 as shown in FIG. 4. This distance between the beveled surface 92 and the beveled surface 74 when the assembly is in the position shown in FIGS. 1-4 and 6 is also about equal to the length of the slot 70 and preferably these distances are exactly equal.
Accordingly, in order to unlock the latch member 110, the door 14 must be moved to the right, closing the space 126 and bringing the assembly to the position shown in FIGS. 1, 2, 3 or 6. The door is closed and is still. securely locked, and in this condition the latch 110 cannot be reached from the outside. The slightest opening of the door 14 moves the tubular member 50 onto the latch member 110 so that it cannot be pivoted. However, from theinside of the door, the latch 110 can be lifted by slight finger? pressure indicated by the arrow 132 (FIG. 6) or by grasping the rod 77 and thrusting it to the left e.g., in the direction of the arrow 134 or both of these forces simultaneously. In the case of a lateral thrust of the rod 77 toward the bracket, the beveled end surface 124 of the latch member 110 cams upwardly on the beveled surface 74, and the latchassumes the open position shown in FIG. 7 with the pin 102 against the left-hand end 136 of the slot 70 and the beveled surface 92 of the rod 77 against the beveled surface 74 on the end of the cleat 68. The latch member 110 than rides up to the position shown as it pivots on the pin 118. This frees the end portion 78 from the tubular rod 50 and the latch assembly 76 can be horizontally pivoted in the direction of the arrow 138 or the rod 50 pivoted in the same direction on the hook 48 to free those members from each other and unlock the door.
It is apparent from this description that the safety lock described can be modified in a number of ways and still retain the locking an unlocking features that have been explained. The pair of bracket members can be in any attitude to accomplish their functions, and adapted to be individually attached in spaced relationship along a longitudinal axis to a pair of structures movable along that axis in relation to each other. Thus, both doors l2 and M can be slidable or one of them can be stationary. The lock can be used between the upper and lower sashes of double-hung windows or between any relatively movable structures. The slot 70 can extend horizontally through an upstanding flange rather than vertically through a horizontal flange as illustrated.
The various interlocking and abutting beveled surfaces such as 74, 90, 592 and 124 can be at any desired angle as long as the latch 11110 is releasable by pivoting upwardly and in the locked position forms a swing bolt assembly which will telescope in the manner shown in FIG. 4. The cross-sectional configuration of the parts such as the swing bolt can be changed from that shown without changing the cooperative functioning of the parts.
The surfaces 9t) and 7d do not have to be coplanar when the bolt is in the position shown in FIGS. 2 and 3 and 6, since the end surface 124 of the latch member 1110 can be notched or otherwise contoured to mate with any offset in the surfaces 90 and 7d. The surface 90 can be omitted so that a space is provided at the juncture of the surface 124 and this abutment, although the structures shown are preferred for smooth operation of the parts and freedom from hang up etc.
Likewise the surface 92 on the rod 77 can be omitted although its relationship with the back part of the surface 7 strengthens the lock and spreads the forces applied to the bracket 62. That part of the surface 74 which registers with the surface 92 does not have to be coplanar with the part of the surface 7% which registers with the beveled end 124 of the latch member 1110 and can be offset either side of the coplanar relationship shown.
The location of the various screws holding the bracket and keeper members can be such that they are attachable only when the spring bolt assembly is unlocked and swung 90 away from the bracket and the hook member as is detached. This eliminates the possibility of disassembly of the lock in its locked position. Likewise, the latch member lllltl can be closely contoured to appear as a part of the rod 77 so that it is not immediately apparent to an outsider that it is a seperable and pivotal member.
The lock of this invention is fabricated of steel or other suitable metal having sufficient strength to withstand hard usage and resist breaking or bending under the lever action of a crowbar or other burglar tools. Advantages of the lock of this invention are its simplicity of operation, the concealed and absolutely secure position of the latch in partially opened position and the adaptability to structures in any attitude without change in the structure of the lock.
The security lock can be applied to any slidable closure and a second structure having a fixed spaced relationship in their closed position whether or not the second structure is stationary or also slidable. The pair of elongated members comprising the rod 50 and swing bolt assembly 76 are adapted to bridge the space between the slidable closure and the second structure with their inner ends in telescoping relationship. Any means can be used to separately support the extended ends of the elongated members to the parts to be locked, preferably one support is a pin-slot arrangement and the other a detachable hook, the former being in permanent sliding orientation with the axis of the telescoping arrangement and the latter being detachable only when the one elongated member is moved out of telescoping alignment. The invention provides in the swing bolt assembly a means to lock one of the elongated members at its support in a first retracted position toward the other elongated member whereby the telescoping relationship is retained yet limited and still protective opening of the closure is provided. The locking means is adapted to be releasable whereby the one elongated member can be extended to allow clearance disengagement of the telescoping relationship in the closed position of the closure and thus unlock the device. in all other positions of the locking means the inner end of one of the telescoping members overlaps the latch sufficiently so that it cannot be released. The distal end of the latch can automatically cam upwardly into the released position in one embodiment.
What is claimed is:
ll. A security lock for a slidable closure having a fixed spaced relationship with a second structure in its close position comprising:
a pair of elongated members adapted to bridge the space between said slidable closure and said second structure with their inner ends in telescoping relationship,
means to separately support the extended ends of said elongated rnembers to said slidable closure and to said second structure whereby said closure and said second structure are movable in relation to each other in a predetermined telescoping distance,
means to lock one of said elongated members at said support means in a first retracted position toward the other elongated member whereby said elongated members are retained in said telescoping relationship to allow limited opening between said closure and said structure,
said locking means including a latch member so positioned as to be overlapped and immobilized by the inner end of the other of said elongated members in said retracted position and being releasable in the extended position of said one elongated member whereby said one elongated member is movable to an extended position away from the other elongated member to allow clearance disengagement of said telescoping relationship in the closed position of said slidable closure whereby said slidable closure is unlocked.
2. A security lock in accordance with claim 1 in which said support means and the extended end of said one elongated member are connected by slidably interengaging elements allowing axial movement of said one elongated member in relation to the other elongated member to and from said retracted and extended position,
said latch member being pivotally :mounted on said one elongated member at a point outside the terminus of said telescoping relationship of said elongated members in their extended axial positions,
the distal end of said latch member being disposed toward said aforementioned support means, and
an abutment of said support means adapted to engage the distal end of said latch member and retain said one elongated member in the retracted position.
3. A security lock in accordance with claim 2 in which: said slidably interengaging elements comprise pin and slot elements of such orientation and dimension as to afford relative movement between said retracted and extended positions.
Al. A security lock in accordance with claim 3 in which:
said support means and the extended end of said one elongated member engage one upon the other by means of opposing planar bearing surfaces and are connected by said slidably interengaging elements so that said one elongated member is movable to and from said retracted and extended positions and is adapted to be pivoted on said planar bearing surfaces out of telescoping engagement with said other elongated element in the extended position of said one elongated member and the release position of said latch member.
5. A security lock in accordance with claim t in which:
said abutment on said support means is provided with a beveled surface facing said latch member,
one of said slidably interengaging elements comprises a slot in said abutment having its longer axis aligned with the axis of said telescoping relationship of said elongated members,
the other of said slidably interengaging elements comprises a pin depending from said extended end of said one elongated member and engaged in said slot against axial displacement,
an elongated recess is provided in the side of the extended end of said one elongated member with a beveled wall at the end of said recess nearest said pin,
said latch member is pivotally mounted at one end within said recess with its distal end supported upon said beveled wall,
said other elongated member has a tubular inner end and the inner end of said one elongated member telescopes therein, I
the space between the inner end of said slot and said abutment being substantially the same as the space between said pin and the beveled wall of said recess, whereby with said one elongated member in the retracted position said latch member occupies said recess and said tubular elongated member telescopes thereover to allow limited opening of said slidable closure and also with the inner ends of said elongated members at the extended limit of their telescoping relationship, upon movement of said one elongated member to its extended position within said slot the distal end of said latch member automatically rides upwardly on said beveled surface of said abutment to allow the inner end thereof to clear its telescoping relationship with the tubular inner end of said other elongated member and unlock said slidable closure.
6. A security lock in accordance with claim in which:
the extended end of said one elongated member is provided with an ofiset wall adapted to engage the abutment of said support means in the extended position of said pin and slot.
7. A security lock in accordance with claim 5 in which:
the length of the telescoping relationship of said elongated members in the retracted position of said one elongated member is sufficiently greater than the length of said latch member to allow same to pivot to the unlocked position.
8. A security lock in accordance with claim 5 in which:
the means to support said other elongated member comprises a combination hook-and-eye attachment at the extended end thereof, said hook and eye being disengageable only with the inner end of said elongated member moved away from said telescopic alignment.
9. A security lock for a sliding closure comprising first and second elongated members in telescoping relation overlapping a predetennined distance for supporting themselves in alignment,
means for controlling said telescoping relation including slidably interengaged pin and slot elements in which said slot is of a length and orientation to afford relative movement of the pin element approximately said predetermined distance,
bracket means for securing one of said elements to a support that is stationary with respect to said sliding closure and limiting movement of the other one of said elements to the length of the slot,
said first elongated member carrying the other one of said elements for disassociation of said telescoping relationship by relative movement of said members in one direction,
one of said elements carrying a shoulder,
latch means movably mounted with respect to one of said elongated members to clear said shoulder when movement in said one direction is made, said latch means engaging said shoulder at other times to hold said members a ainst said disassociation movement, loc mg means carried by one of said members engaging said latch means and securing it in its shoulder-engaging position while said members are moved relative to each other in a direction opposite to said one direction,
stop means carried by one of said members for limiting the distance of further telescoping movement between them in said other direction, and
means securing the second member to the sliding closure.
10. The combination called for in claim 9 in which said securing means is releasable and comprises interlocking elements, one having an opening and the other having an angular member received through said opening and the inner portion of said angular member being disposed in interference engagement with said other interlocking element as oriented by telescopic movement of said second member, said angular member being moved from said interference engagement when said telescoping relationship is disassociated and said telescoping members are moved from axial alignment.
11. The combination called for in claim 9 in which said securing means comprises hook-and-eye elements and the terminal end of said hook is disposed at an angle to the axis of the telescoping relation.

Claims (11)

1. A security lock for a slidable closure having a fixed spaced relationship with a second structure in its close position comprising: a pair of elongated members adapted to bridge the space between said slidable closure and said second structure with their inner ends in telescoping relationship, means to separately support the extended ends of said elongated members to said slidable closure and to said second structure whereby said closure and said second structure are movable in relation to each other in a predetermined telescoping distance, means to lock one of said elongated members at said support means in a first retracted position toward the other elongated member whereby said elongated members are retained in said telescoping relationship to allow limited opening between said closure and said structure, said locking means including a latch member so positioned as to be overlapped and immobilized by the inner end of the other of said elongated members in said retracted position and being releasable in the extended position of said one elongated member whereby said one elongated member is movable to an extended position away from the other elongated member to allow clearance disengagement of said telescoping relationship in the closed position of said slidable closure whereby said slidable closure is unlocked.
2. A security lock in accordance with claim 1 in which said support means and the extended end of said one elongated member are connected by slidably interengaging elements allowing axial movement of said one elongated member in relation to the other elongated member to and from said retracted and extended position, said latch member being pivotally mounted on said one elongated member at a point outside the terminus of said telescoping relationship of said elongated members in their extended axial positions, the distal end of said latch member being disposed toward said aforementioned support means, and an abutment of said support means adapted to engage the distal end of said latch member and retain said one elongated member in the retracted position.
3. A security lock in accordance with claim 2 in which: said slidably interengaging elements comprise pin and slot elements of such orientation and dimension as to afford relative movement between said retracted and extended positions.
4. A security lock in accordance with claim 3 in which: said support means and the extended end of said one elongated member engage one upon the other by means of opposing planar bearing surfaces and are connected by said slidably interengaging elements so that said one elongated member is movable to and from said retracted and extended positions and is adapted to be pivoted on said planar bearing surfaces out of telescoping engagement with said other elongated element in the extended position of said one elongated member and the release position of said latch member.
5. A security lock in accordance with claim 4 in which: said abutment on said support means is provided with a beveled surface facing said latch member, one of said slidably interengaging elements comprises a slot in said abutment having its longer axis aligned with the axis of said telescoping relationship of said elongated members, the other of said slidably interengaging elements comprises a pin depending from said extended end of said one elongated member and engaged in said slot against axial displacement, an elongated recess is provided in the side of the extended end of said one elongated member with a beveled wall at the end of said recess nearest said pin, said latch member is pivotally mounted at one end within said recess with its distal end supported upon said beveled wall, said other elongated member has a tubular inner end and the inner end of said one elongated member telescopes therein, the space between the inner end of said slot and said abutment being substantially the same as the space between said pin and the beveled wall of said recess, whereby with said one elongated member in the retracted position said latch member occupies said recess and said tubular elongated member telescopes thereover to allow limited opening of said slidable closure and also with the inner ends of said elongated members at the extended limit of their telescoping relationship, upon movement of said one elongated member to its extended position within said slot the distal end of said latch member automatically rides upwardly on said beveled surface of said abutment to allow the inner end thereof to clear its telescoping relationship with the tubular inner end of said other elongated member and unlock said slidable closure.
6. A security lock in accordance with claim 5 in which: the extended end of said one elongated member is provided with an offset wall adapted to engage the abutment of said support means in the extended position of said pin and slot.
7. A security lock in accordance with claim 5 in which: the length of the telescoping relationship of said elongated members in the retracTed position of said one elongated member is sufficiently greater than the length of said latch member to allow same to pivot to the unlocked position.
8. A security lock in accordance with claim 5 in which: the means to support said other elongated member comprises a combination hook-and-eye attachment at the extended end thereof, said hook and eye being disengageable only with the inner end of said elongated member moved away from said telescopic alignment.
9. A security lock for a sliding closure comprising first and second elongated members in telescoping relation overlapping a predetermined distance for supporting themselves in alignment, means for controlling said telescoping relation including slidably interengaged pin and slot elements in which said slot is of a length and orientation to afford relative movement of the pin element approximately said predetermined distance, bracket means for securing one of said elements to a support that is stationary with respect to said sliding closure and limiting movement of the other one of said elements to the length of the slot, said first elongated member carrying the other one of said elements for disassociation of said telescoping relationship by relative movement of said members in one direction, one of said elements carrying a shoulder, latch means movably mounted with respect to one of said elongated members to clear said shoulder when movement in said one direction is made, said latch means engaging said shoulder at other times to hold said members against said disassociation movement, locking means carried by one of said members engaging said latch means and securing it in its shoulder-engaging position while said members are moved relative to each other in a direction opposite to said one direction, stop means carried by one of said members for limiting the distance of further telescoping movement between them in said other direction, and means securing the second member to the sliding closure.
10. The combination called for in claim 9 in which said securing means is releasable and comprises interlocking elements, one having an opening and the other having an angular member received through said opening and the inner portion of said angular member being disposed in interference engagement with said other interlocking element as oriented by telescopic movement of said second member, said angular member being moved from said interference engagement when said telescoping relationship is disassociated and said telescoping members are moved from axial alignment.
11. The combination called for in claim 9 in which said securing means comprises hook-and-eye elements and the terminal end of said hook is disposed at an angle to the axis of the telescoping relation.
US3608940D 1969-10-30 1969-10-30 Slidable door safety lock Expired - Lifetime US3608940A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD244004S (en) * 1975-11-13 1977-04-12 Elkhart Rivet & Register Co., Inc. Double acting door lift and closing device
US4295676A (en) * 1980-01-15 1981-10-20 Smith James A Patio door security lock
US4405166A (en) * 1981-04-17 1983-09-20 Lovis Luis H Energy saving window lock
US4409757A (en) * 1981-07-29 1983-10-18 John Daugherty Security latch assembly
US4462625A (en) * 1982-02-08 1984-07-31 Barnhill Alton L Safety entry latching arrangement
US4674779A (en) * 1983-05-04 1987-06-23 Pratt William M Adjustable lock for sliding closures
US5014527A (en) * 1989-11-08 1991-05-14 Traller Thomas H Kickproofer
AU782216B2 (en) * 2000-10-11 2005-07-14 Opus Management Pty Ltd A device for opening a security screen
US20070000179A1 (en) * 2003-07-29 2007-01-04 Hoedtke Gmbh Co. Kg Metall-Und Lasertechnik Sliding door comprising a guide for a door leaf
US9103144B2 (en) 2013-11-26 2015-08-11 Vision Industries Group, Inc. Door travel limiting device
US9243431B1 (en) * 2013-09-13 2016-01-26 Daniel DeLeon Lock-out tag-out bar system

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US534923A (en) * 1895-02-26 Sash holder and fastener
US1601524A (en) * 1926-01-09 1926-09-28 Thomas F Gibbons Sash lifter and fastener
US1752472A (en) * 1928-03-08 1930-04-01 Whitmanis Mfg Company Supporting bar
US1756716A (en) * 1928-03-01 1930-04-29 Whitmanis Mfg Company Inc Supporting bar
US2402507A (en) * 1943-12-20 1946-06-18 Barcalo Mfg Co Curtain rod or fixture
US2912268A (en) * 1957-10-09 1959-11-10 William H Markovich Anti-burglar window lock
US3471189A (en) * 1967-12-14 1969-10-07 Juliea M Ness Sliding door lock
US3486781A (en) * 1968-02-01 1969-12-30 David L Crum Sliding closure lock

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US534923A (en) * 1895-02-26 Sash holder and fastener
US1601524A (en) * 1926-01-09 1926-09-28 Thomas F Gibbons Sash lifter and fastener
US1756716A (en) * 1928-03-01 1930-04-29 Whitmanis Mfg Company Inc Supporting bar
US1752472A (en) * 1928-03-08 1930-04-01 Whitmanis Mfg Company Supporting bar
US2402507A (en) * 1943-12-20 1946-06-18 Barcalo Mfg Co Curtain rod or fixture
US2912268A (en) * 1957-10-09 1959-11-10 William H Markovich Anti-burglar window lock
US3471189A (en) * 1967-12-14 1969-10-07 Juliea M Ness Sliding door lock
US3486781A (en) * 1968-02-01 1969-12-30 David L Crum Sliding closure lock

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD244004S (en) * 1975-11-13 1977-04-12 Elkhart Rivet & Register Co., Inc. Double acting door lift and closing device
US4295676A (en) * 1980-01-15 1981-10-20 Smith James A Patio door security lock
US4405166A (en) * 1981-04-17 1983-09-20 Lovis Luis H Energy saving window lock
US4409757A (en) * 1981-07-29 1983-10-18 John Daugherty Security latch assembly
US4462625A (en) * 1982-02-08 1984-07-31 Barnhill Alton L Safety entry latching arrangement
US4674779A (en) * 1983-05-04 1987-06-23 Pratt William M Adjustable lock for sliding closures
US5014527A (en) * 1989-11-08 1991-05-14 Traller Thomas H Kickproofer
AU782216B2 (en) * 2000-10-11 2005-07-14 Opus Management Pty Ltd A device for opening a security screen
US20070000179A1 (en) * 2003-07-29 2007-01-04 Hoedtke Gmbh Co. Kg Metall-Und Lasertechnik Sliding door comprising a guide for a door leaf
US9243431B1 (en) * 2013-09-13 2016-01-26 Daniel DeLeon Lock-out tag-out bar system
US9103144B2 (en) 2013-11-26 2015-08-11 Vision Industries Group, Inc. Door travel limiting device

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