US1028860A - Gravity-lock. - Google Patents

Description

J. GARLSTBDT.

GRAVITY LOCK. APPLICATION FILED 11211.15, 1911.

2 SHEETS-S HEBT 1.

1,028,860, Patented June 11,1912.

Izzy-.

COLUMBIA PLANoaRAPl-l Co.,wAsHlNuToN D c J. H. CARLSTBDT.

GRAVITY LOCK.

f APPLICATION FILED APB.15, 1911. l 1 ,028,860. .Patented June 1,1, 1912.

ZIJ/Illness es cDLUMBlA PLANDGRAPH Co., WASHINGTON. D. c.

` Sweden,

JOI-IAN HJ'ALIVIAR CARLSTEDT, 0F GEFLE, SWEDEN.

GRAVITY-LOCK.

Speccaton of Letters Patent.

Patented June 11, 1912.

Application iiled April 15, 1911. Serial No. 621,397.

To all whom t may concern.'

Be it known that I, JOHAN I-IJALMAR CARLSTEDT, a subject of the King of Sweden, residing at Gefle, in the Kingdom of have invented new and useful Improvements in GravityLocks, of which the following is a specification, reference being had to the drawings accompanying and forming a parthereof.

This invention relates to improvements in springless or gravity locks for doors and the like.

The object of the invention is to provide, a lock of this character which has only a small number of parts of a simple form and which is therefore comparatively easy and inexpensive to manufacture and in which the parts may be made of such dimensions as to be strong without the lock as a whole being bulky.

The invention consists, chiefly, in this that the lock casing is movable up and down and acts by its own weight and the weight of. the parts inclosed in the same directly on the latch bolt or a bolt-actuating member or members connected thereto 'in such a manner as to cause the said bolt to advance by the descending movement of the casing.

The invention further comprises the con struction and combination of parts herein after set forth.

In the drawing, I have shown by way of example a door lock embodying the invention.

Figure 1 is a side view of the lock with the face of cover plate partly broken away to show the operating parts, said parts being shown in their advanced or locking position which they normally take up, whether the door be open or closed, except at such times as they are retracted by the manipulation of the vdoor knob or handle. Fig. 2 is a similar view of the lock with the parts in retracted positions. Fig. 3 is a vertical cross-section of the lock.' Fig. 4 is a hori- Zontal section of the same. Fig. 5 is a front view of the latch bolt, and Fig. 6 is a front view of the striker plate with the hole for the said-latch bolt.

Referring to the drawing, 1 is the lock casing set in a recess in the edge of the door. The said recess is somewhat higher than the casing so as to allow the latter to move vertically therein. The casing is Guided in its movement by two or more verlt-ical bars 2 or the like engaging-corresponding grooves in the outer sides of the side walls of the casing and bearing with their outer sides on the walls of the recess in the edge of the door. The width of the casing is somewhat less than that ofthe recess, t'. c. the bars 2 project somewhat outside the `sides of the casing, as shown in Fig. 3, by

which the casing is held in proper position out of contact with the walls of the recess and guided during its vertical movement.

Journaled in the lower part of the rods 2, below the casing 1, is the spindle or shank 3 of the door knob or handle. Attached to the said spindle, which is preferably rectangular in shape, is a lift arm 4. This arm normally takes up the horizontal position shown in Fig. 1 and serves to' support and raise the casing and to be actuated by the same for the advancement of the latch bolt. Attached to the spindle 3, at right angles to the arm 4, is a second arm 5 entering a recess or opening in the rear part of the latch bolt 6 and serving as a boltactuating member. The shank of the bolt 6 is guided at itssides by one side wall of the casing and the arm 5 and at its lower side'by a plate 7 or the like. The upper half of the head of the bolt is obliquely cut, as shown in Figs. 4 and 5 so as to cause the said bolt to slide inward by the lateral pressure thereon eX- erted by the door jamb or striker plate, when 4the door is `forcibly swung into closing position. In order to prevent the bolt from sliding inward so as to unlock the door when the latter is exposed to pressure, the lower half of the head of the bolt is partly cut away, as shown in Figs. 2 and 5 leaving a comparatively thin plate of uniform thickness adapted to enter a corresponding downward extension of the bolt opening in the striker plate 8 (Fig. 6). The opening in the' said plate must obviously be suiiiciently high to allow the bolt head to move vertically therein when the door is locked or unlocked.

Placed above the latch bolt 6 is a locking dog or tumbler 9 adapted to swing about a pivot pin 10 and to drop into a notch 11 in the bolt 6 when the latter is moved suiii.

ciently toward the right' from the position shown in Fig. l.

The described lock works as follows: When the lock is to be* opened, the shank or spindle 3 is turned in a direction causing the arm 4 to'swing upward and the arm 5 to swing laterally from the position shown no i in Fig. 1 into the position shown in Fig. 2. In so doing, the casing l is raised by the arm 4, and the bolt 6 is moved inward by the arm 6. If the lock is thereupon released, the casing l and the bolt 6 actby gravity to press the arm 4 downward, thereby turning the spindle 3 and causing the arm 5 to advance the bolt 6. If the door handle is operated so as to turn the arms l and 5 from the position shown7 in Fig. l toward the right e. in the clockward direct-ion), the bolt 6 is advanced farther into the recess in the door j amb so as to allow the tumbler 9 to drop by gravity into the notch ll in the latch bolt, thereby securing the latter in its advanced position so that it cannot be retracted, without the tumbler being first raised by a suitable key. The bolt 6 thus serves as a combined latch and locking bolt by which the door may be secured in its closed position.

I claim:

l. In a gravity lock, the combination of a vertically movable casing, a sliding bolt mounted in the said casing, and connections between the said casing and the said sliding bolt causing the latter to be advanced by the descending movement of the casing.

' 2. In a lock, the combination of a vertically movable casing, a sliding bolt mounted in the said casing, a spindle, bolt-actuating means attached to the said spindle, said means comprising two armsone of which serves as a lift arm for the casing, while the other engages the sliding bolt, causing the same to be advanced by the descending movement of the casing.

3. In a lock, the combination of a verti` cally movable casing, guide bars engaging corresponding grooves in the said casing, and a sliding bolt mounted in the said casing in such a manner as to be advanced by the descending movement of the same.

4. In a lock, the combination of a vertically movable casing, guide bars engaging Acorresponding grooves in the said casing, a sliding bolt mounted in the said casing, and

' connections between the said casing and the said sliding bolt causing the latterto be advanced by the descending movement of the casing.

5. In a lock, the combination of a vertically movable casing, a sliding bolt comprising a shank and a head mounted in the said casing in such a manner as to be advanced by the descending movement thereof, and a striker plate having an opening for the head of the said bolt, said bolt having the upper part of the head obliquely cut at the end and the lower part thereof partly cutaway, leaving a comparatively thin plate of uniform thickness adapted to enter a corresponding downward extension of the opening inthe striker plate.

6. In a lock, the combination of a vertically movable casing, a sliding bolt comprising a shank and a head mounted in the said casing, connections between the said casing and the said sliding bolt causing the latter to be advanced by the descending movement of the casing, and a striker plate having an opening for the head of the said bolt, said bolt having the upper part of the head obliquely cut at theend and the lower part thereof partly cut away, leaving a comparatively thin plate of uniform thickness adapted to enter a corresponding downward extension of the opening in the striker plate.

7 In a gravity lock, the combination of a vertically movable casing, a sliding bolt mounted in the said casing, connections between the said casing andthe said sliding l bolt .causing the latter to be advanced by the descending movement of the casing, and a tumbler for securing the bolt in protracted position when the latter is further advanced.

JOHAN HJALMAR CARLSTEDT. Witnesses:

L. LUNDGREN, ELLA BILILD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. Y

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