US1548744A - Auxiliary lock for doors and windows - Google Patents

Description

W. C. PRATT AUXILIARY LOOK FOR DOQRS AND WINDOWS Aug. 4, 1925.

Filed April 2 1924 Patented Aug. 4, 1925.

OFFICE.

WELLIAM CORNER PRATT, .OF HORNSBY,.1\TEAR SYDNEY, NEW SOUTH WALES, AUSTRALIA.

AUXILIARY LOCK FOR DOORS AND WINDOWS.

Application 'filed April 2, 1924. Serial No. 703,777.

To all whom it may concern:

Be it known that 1, WILLIAM CORNER PRATT, a subjectoi' the King of Great Brita-in, residing at l-lornsby, near Sydney, in the State of New South Vales, Common wealth of Australia, have invented new and useful Improvements in Auxiliary Locks for Doors and WVindows, of which the following is'a specification.

This invention consists in a locking device usable on hinged doors and windows, and also on sliding doors and windows, for securing the same in fully, closed or par tially open position in such a way that they may be released for full opening to admit a person only by the action of a person located within the apartment.

The device consists-of-a slotted metal arm which is detachably held in a fixed staple secured to the door'or window jamb or frame and a latch lock fixed on the door or -window and adapted to co-act with said arm to limit the extent of opening of the door .orfsash. The stub end of the slotted arm is ofl'setand is slid into a staple which is apermanent 'fiXt-UIG'OD the post or frame. The bolt'of the latch is slotted so that when partially retired the slots come to register with the edges of the slot in the bracket ;arm, permitting the door or sash to be opened only so far asthe slot extends, that Eis,-sufficient only for the purpose of facili- Ltating. ventilation. The part of the slot near the bent stub end oi the bracket arm is notched to offer sufiicient width to enable the latch bolt to be shot and retired When the boit is extended or shot so that the slot in it comes beyond the edge of the bracket arm slot it acts as a lock to prevent "opening of the-door. As the latch boltcan be retired only when the door or sash is fully closed, access cannot 'be had to the apartment from outside. A keeper is fitted on the bracket arm near thestub end of it to engage zone "of the slots in the bolt and prevent withdrawal of the bolt even whilst "the door or window is in fully closed position. This keeper must be released by a person within the apartment in order to iree the latch bolt, but it is reset automatically when the latch-bolt traverses the slot in "the c'losing movement of the door, so that when the door has been closed :the keeper is found restored to :its original position and the voluntary action of a person closed position.

within the apartment is necessary to free the lock. Another keeper is in the shapeiof a -check-paw l arranged at the inner .end of the slotted arm to engage the lock bolt and hold the door or window in the partialiy open position to facilitate ventilation.

In the accompanying :drawings- Figure l is a perspective elevational view showing the device fixed on a liinged Ldoor with the bolt partially shot and its slot-s engaged with the slot edges in the bracket arm; I

Figure 2 is a fragmentary rperspectiveelevational View showing the attachment arranged :as a sliding window check; and

Figure 3 is a fragmentary perspective view showing the bolt in the fully shot position. 7

In the case of a hinged door or window, the slotted arm 10 is curved :to the radius of the door or window sweep; in the case arm 10, and 12 the :notched portion of-same in register with the spring bolt "13 of the latch when the door or window is in tally The stub end-of the z-slotted bracket arm 10 is bent to form a tang 14 which is slid into the fixed staple 15. This staple is secured to the door frame or post 16 by a screwor screws,rthe heads oi which are covered by the tang 14 when same is inserted. The tang 14 is held in position in the staple 15 by means of a screw 17.

The latch bolt 13 is housed in a casing 18 and the bolt is backed a spring which normally tends to force it outward. The casing is fi xeditothe door or sash :byazscrew through its back plate, a hole-85 being made 'in the case back to offer access 'to the :head *ofthis screw when the :bolt 13 is removed .from :its housing.

The tail of the bolt 13 is formed as a finger piece 19 to facilitate its withdrawal. .A keeper freely pivotedat 21 to the housing 18 is provided for engaging the :finger piece :19 :to :hold the bolt 13 in retired position :and to prevent it from engaging :the slotted bracket.

Attop and bottom the nose of the bolt 13 :is slotted as shown at :22 and .23. These and :the door. may then be swungopen with the bolt 13 engaged in the slot 11. The extent of opening of the door orwindow is then limited by the length of the slot 11,-

- suiiicient to accommodate not" only the thickness of the slotted bracket 10 but also the thickness of the keeper 25. The pivot 26 is so positioned that in the fully closed position ofthe door or window the forward end of the keeper may set in the bolt slot 22. The keeper must be tilted upwardly to free its forward end from the bolt slot 22 before the bolt 13 canbe withdrawn to allow of the door or window to be opened to a greater extent than is permitted by the range of the, slot 11. In the opening movement, so long as the bolt 13v is in the position shown in Fig. 1, the keeper 2 1 is reset automatically and it does not become released unlessmanipulated when the door or window is brought 'tothe shut position.

On the keeper 20 being released the bolt 13 is shot by its spring. lVhen the door or Window is normally shut and the keeper 25 "is tipped up (see Fig. 3), the bolt 13 will be fully shot through the notched portion 12 of the slot 11 and will lock thedoor or window in the fully closed position. If the bolt be withdrawn till its slots 22 and 23 register with the edges of the slot 11, the door or window may be swung open as far as the length of the slot 11 permits, and until the door or window has been again brought to y the fully closed position and the keeper 25 tilted to the free position and the bolt 13 withdrawn by the occupant of the apartment, it will not be possible for a person to enter the apartment from without. Even if the door or window be left opento the full extent-permitted by the length of the slot 11, it would be useless for an intruder to insert his arm through the open portion and set the keeper "25, for in the closing movement to bring the bolt 13 to the clear-, ance notch 12 at the base of the slot 11, the keeper will be automatically reset at the locked position or will chock the bolt so that it cannot enter the slot notch and the bolt cannot in either of these conditions be withdrawn. Perfect security for the occupant of the apartment is therefore assured. When the bolt is set back by means of the keeper, the device is inoperative and the door or sash may then be closed and fully opened in the usual way. If the bolt be held back manually the door or sash will be freed to open fully. 'Then if closed after the bolt has been released by the hand the bolt will become automatically r eengaged in the slot as soon as full closed position is reached.

In the case of the window latch type of fastener shown in Fig. 2, another form of keeper issubstituted for the swing keeper 20 shown in Fig. 1. The keeper in this case may be a clip 30, the nose 31 of which takes over the end of the bolt 13 whilst its rear part is engaged by the the upset tang 32 the normal locking means, and also as means for permitting a limited movement only of i a door or window, or it may be used as a supplemental locking device operative with or independently of other latching or look ing devices. F

What I do claim is:

1. A locking device'for limiting the degree of opening of doors and Windows and for fastening the same in closed position, comprising a bracket arm with closed end longitudinal slot therein, a latch bolt deeper than the width of the slot,and having slots across the top and bottom faces of its head which slots register with the edges of the slot in the bracket arm when the boltis partially shot, a clearance s ace for the bolt head at the base of the brac et arm slot, and a keeper engageable' in one of the bolt nose slots and pivotally mounted on one side of the bracket arm, with one end ofit disposed across said clearancespaceto partly close said spacei 2. A locking device for limiting the degree of opening of doors and windows, consisting of a spring latch bolt with cross slotted head co-acting with a closed. end a slot in a bracket arm by sliding engagement of the cross slots with the edges of I the bracketarm slot, a clearance space at one end of said bracket arm slot to permit bolt movement therethrough to engage and disengage the bolt and the bracket arm, and a pivoted keeper on the bracket arm engageable with one of the bolt cross slots and disengageable therefromonly whilst the bolt is in register withthe clearance space.

3. A locking device for limiting the degree of opening of doors and windows, consisting of a slotted bracket arm 10 with staple mounting tang 14, a clearance way 12 at the base of the slot 11 in alignment with 1.

the bolt head 13 in the closed position of the door or window, a spring latch bolt 13 having its head cross notched at 2223 to register with the edges of the slot 11, a keeper 25 pivotally mounted at 26 rearward of the lock bolt, and with its inner end projecting across the clearance space 12, means for manipulating the bolt 13 and for checking it in retired position and a check pawl 24 adapted for chocking the bolt in the fully open position of the door or window, said keeper 25 adapted to reset automatically in the closing movement of the door or Window to hold the bolt engaged by it at the clearance space until said keeper 25 is manipulated from within the apartment to clear the bolt and permit its retirement, substantially as described.

In testimony whereof I aflix my signature in the presence of two witnesses.

WILLIAM CORNER PRATT.

Witnesses N. STABPEID, R. BOULTON.

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