US2024497A - Lock - Google Patents

Description

L. ALBERTI Dec. 17, 1935.

LOCK

Filed July 2, 1954 gin/vanto@ Hummm i W11* Il l l l l Patented Dec. 17, 1935 UNITED STATES ATENT QFFIE LOCK I Luis Alberti, Buenos Aires, Argentina Application July 2, 1934, Serial N0. 733,514 2 claims. (Ci. 711-47) This invention refers to locks, both for room doors and the like which are actuated indifferently from either side of the door and for doors of closets, safeboxes and the like which are actuated from only one side. This new lock is simple in construction, operates easily and provides substantially an absolute safeguard against violation.

The invention is illustrated in the accompanying drawing, in which- Figure 1 is a View, partly in section and partly in elevation, of a lock having the invention applied thereto,

Figure 2 is a section on the line 2-2 of Figure 1, Y

Figure V3 is an enlarged longitudinal section through the locking mechanism of the invention,

Figure 4 is a detail view similar to Figure 3 and showing a diiferent position of the parts at the inner end of the lock.

Referring in detail to the drawing, I is the key, 2 is the exterior handle, of any approved form, of a roll-back shaft 3 which passes through the whole locking mechanism and which at its interior end, is provided. with a roll-back arm I2 which actuates the lock bolt I3.

The lock includes a metal block 4 which is preferably circular in cross section and has an opening extending from end to end thereof through its upper portion and in which the roll-back shaft 3 is mounted to rock or rotate. The rollback shaft has a circumferential notch or socket 5 at or near its inner or rear end and contains a plurality of radial perforations 6.

These perforations 6 are continuedalong both sides of the roll-back shaft into the block 4, so that they form complete channels which extend from one side of the block 4, through the bar 3, to end at the other side of the block 4 where will be found the open longitudinal space or key slot l,

provided for the introduction of the key I.

At the end which is most remote from the open longitudinal key slot 1, each perforation houses ak spring 8 bearing upon a pin segment 9 which, when spring 8 is closed, will reach exactly to the part crossed by the roll-back shaft 3. The part of the perforation which passes through the rollback shaft 3, contains a pin segment Ill, and a third pin segment Il occupies the rest of the perforation, viz. the portion between the rollback shaft 3 and the open longitudinal space or keyhole 1. The latter segments II are of different lengths relative to the perforation which they respectively occupy between the roll-back shaft 3 and the open longitudinal space or keyhole 1, and the walls of this space or key slot are grooved or ribbed longitudinally to correspond to the cross section of the key and the edge of the key is serrated or notched to present an outline mating with the outline presented by the projecting ends of the series of pins.

As will be understood, when the key I is withdrawn from the keyhole l, there is a cessation of the pressure which said key exerted through the pin segments 9, IU, I I upon the springs 8. Springs 8, therefore, will now push pin segments 9 towards the open longitudinal space or keyhole l, causing them to enter partially into the perforations of the roll-back shaft which up to now had been occupied solely by segments I0, and causing the pin segments I to enter partially into the continuations of said perforations in block 4, the pin segments I I in turn being projected partially into the key slot l. As the ends 'of the pin segments are now no longer in line with the circumference of the roll-back shaft 3, the bar will be held against turning and the lock cannot be opened.

When the key is again inserted in the key slot, the pin segments II will be pushed back into Vthe interior of the perforations, they will push upwards the segments Il) and these in turn will push segments 9 these latter segments nally will press against springs 8 and the ends of the segments again will be in line with the circumference of the roll-back shaft 3 which thus will be enabled to turn.

However, the alinement of pin segments 9, I0, II with the roll-back shaft will not alone permit rotary movement of the bar. 'Ihere is still another safety device which impedes it. Indeed, it was said before that the roll-back shaft 3 has a groove 5, and in passing also may be mentioned set screw 23 which is mounted in the upper portion of the block 4 and projects into another annular groove 24 on the roll-back shaft 3 with the purpose of safeguarding the shaft 3 against movements in a longitudinal direction. Groove or socket 5 forms only a hole which is .alined with a groove or recess in the block in which is slidably mounted a pin 20 beneath which is a spring 2I, and near its lower end a recess or notch 22 is formed in the pin 20 to be engaged by the tapered point of the key. Normally, when the key is not in the lock, the head or superior end of pin 2i) enters into groove 5 of the roll-back shaft 3, as spring 2| pushes pin 20 upwards. In this position, the recess 22 remains so high that, when the key arrives at the pin, its point touches the lowest part of the recess, and as the key progresses, the inclined edge face of its point draws pin 2l) downwards, withdrawing its head from socket of roll-back shaft 3. It is, therefore, necessary that the point of key I enters into recess 22 of pin 20, so as to exercise a pressure which acts upon spring 2l .and produces the descent of pin 20, the head of which is thus withdrawn from the socket 5, placing the roll-back shaft 3 into condition to turn. This construction offers an important additional device to augment the security of the lock.

As will have been seen, the purpose of key I is only to enable, by means of its introduction into keyhole 1, the roll-back shaft 3 to turn, Whereas the key itself remains stationary. After inserting the key, a rotary movement can be given to the roll-back shaft 3 by means of its handle 2, whereby arm I2 provided at the interior end of the roll-back shaft 3 will turn also. During its rotary or rocking movement the roll-back arm I2 will lift the tumbler I4 against the force of ,a spring I5 which bears upon the upper edge of the tumbler to yieldably hold it in its lowered normal position. The arm I2 then engages a notch I6 in the upper wall of an opening or slot in the bolt I3 so as to partly retract the bolt, and during a second revolution the arm I2 will engage a second notch I1 in said wall, thereby fully retracting the bolt so that the door may be opened. These notches I6 and I1 of the lock bolt 3 and cooperating elements are in double systems, used for room doors and others which are to be actuated indiierently from one side or the other, within reach of the roll-back arm I2 of each one of the two mechanisms, and this will be seen when looking at Figure 2 where lock bolt I3 occupies the central part anked by the two mechanisms which, on doors which are to be actuated from one side only, will be reduced to one mechanism; as will be understood.

The door may be provided With'the usual latch bolt indicated at I8.

Although the locking device has been described and illustrated particularly with reference to room doors actuated from both sides, it is to be understood that the invention is not limited to this use which has been chosen to show the device in its most complicated form. The device, in a. more primitive form of construction, viz.: using a single mechanism, can be employed for all kinds of Yclosure devices, wherever fastening means are to be applied. The invention can be used for 5 padlocks, for fastening motor cars, the curtains of show-windows, closure doors of closets, safe boxes and, finally, all objects, doors or openings which are to be locked by means of a locking system.

What I claim as my invention, and desire to 10 secure by Letters Patent, is as follows:

l. A locking device comprising a block having .an opening extending through its upper portion from end to end thereof and a key slot in its lower portion parallel with said opening, a rollback shaft mounted in said opening and having a socket in its circumferential surface at its inner end, tripartite pins mounted in the block and the shaft and operable by an inserted key, a latch bolt slidably mounted in the block at the inner end thereof to engage the socket in the shaft, said latch bolt having a recess in its lower portion presented to the key slot, and yieldable means for holding said latch bolt in an upper position, the recess being engaged by the tapered end of an inserted key to draw the latch bolt from the shaft.

2. A locking device comprising a block having an opening formed therethrough and a key slot parallel with said opening, a roll-back shaft mounted in said opening and adjacent its inner end having a socket in its circumferential surface, tripartite pins mounted in the block and the shaft and operable by an inserted key, a latch bolt slidably mounted in the block and movable radially of the shaft into and out of position to engage in the socket in the shaft, said latch bolt having a seat presented to the key slot and formed with a cam surface, and yieldable means for holding said latch'bolt in position to enter the socket of the shaft, the cam surface being engaged by the end of the inserted key to move the latch bolt away from the shaft.

LUIS ALBERTI.

Images