US2620649A - Pin tumbler lock - Google Patents

Description

1952 v. s. D. BERNARDO 2,620,649

PIN TUMBLER LOCK Filed Feb. 1a. 1948 F/GJ A'I'TEI R N EYE Patented Dec. 9, 1952 PIN TUMBLER LOCK Vicente Santo Domingo Bernardo, Binondo, Manila, Phillippine Islands Application February 18, 1948, Serial No. 9,262

. V l This invention relates to looks of the pin] or tumbler typejwherein a key receiving cylinder actuates'the lock bolt and the cylinder is freeto turn only when divided pins have been actuated to predeterminedpositions by a key, and in particular the inventionrel-atesto a tumbler lock having in additionto the usual row of pins or tumblers'a 7 second row parallel to the former row and staggered in relation thereto and a safety pin positionedflopposite to the usual row' of pins and adapted to register with a recess in the back of the key.

The purpose of this invention is to provide a lock of the pin or tumbler type that is substantially impossible to pick open or actuate with a pass key.

In the usual lock it is possible to manipulate the pins with a wire or relatively small device so that the separating points are aligned with the surface of the cylinder so that the cylinder may be turned to actuate or open the lock. With this thought in mind this invention contemplates a cylinder lock' wherein the key slot is arcuatelinstead of straight and in which two rows of pins are used and an additional pin is provided in the opposite side. 7

' The object of this invention is to provide means for incorporating a second row of pins in a cylinder lock and also a pin'for' engaging the back or other part of a key wherein it is substantially impossible to pick the lock.

a cylinder lock having an arcuate key slot so that it is difiicult to open the lock with a wire or the like.

A further object of the invention is to provide a cylinder lock of the pin type having a double row of pins and an oppositely positioned pin to engage the back of a key which is of a simple and economical construction.

With these and other objects and advantages in view the invention consists of the new and novel combination, construction, and arrangement of parts as hereinafter more fully described, set forth in the claim appended hereto and disclosed in the accompanying drawings, forming part hereof, wherein:

Figure 1 is a view showing a side elevation of the lock.

Figure 2 is a view showing an end elevation of the lock looking toward the rear thereof.

Figure 3 is also an elevation of the lock looking toward the front thereof.

Figure 4 is a longitudinal section through the lock illustrating the relative positions of the parts, and taken on line 44 of Figure 2.

Another object of the invention is to provide- 1 Claim. (Cl. 7i)358) 2 Figure 5 is a sectional plan through the housing or casing of the lock taken on the center thereof and looking downward. f y.

Figure 6 is a cross section through the cylinder showing the relative positions of the key slot and pins. I

Figure 7 is a view showing a key adaptedto be usedin the lock, with part broken away. j Referring now to the drawings wherein like reference characters denote corresponding parts the tumbler lock of this invention includes a cylinder l0 which is rotatably mounted in a, casing Il,:and which is provided with rows of. pins l2 and I3 in'one side and a pin 14in the L opposite side, and the pinsare positioned to coact with corresponding pins in the casing."

The cylinder lOfis formed with a flange l5 at theouter end and a lock bolt It extends from'the inner end which extends through a washer I! that is held by screws l8-and l9. Thejscrews l8 and I9 extend through the washer ll and into the casing II, there being a circular opening 9' arranged in the washer I! through which the shaft l6 rotatably projects. The, cylinder is provided with anarcuateor crescent-shaped key slot having arms 2| and 22 and a groove 23' for a'rib at' the back of a key 24. The cylinder is provided with two rows of staggered pin openings v25'and 26 which are in line with the edges of the arms of the key slot, and another pin opening 21 is propins terminate at the surface of the cylinder when the proper key is inserted in the key slot,

whereas with any other key in the slot the pins will cross the intersection of the cylinder withv the casing and prevent the cylinder turning.

The pins l2 and I 3 coact with pins 30 in the casing and the pin I4 coacts with a pin 3| that is,

The

held inward by a spring 32 in a. slot 33. spring 32 is mounted in the casing by a screw 34,

as shown. The pins 30 are held in the casing by a plate 35 with springs 36 urging the pins inward, as shown in Figure 4, and the plate 35 is held by screws 31 and 38.

The casing II is provided with a facing flange 42 having a circular recess 43 therein to receive the flange I5 of the cylinder, and threaded lugs 44 and 45 at the sides, by which it may be se cured in a door or the like. The casing may, however, be provided with any suitable mounting means and the cylinder or pins may be held therein in any suitable manner.

The pins of the different rows and also the openings therefor in the casing and cylinder are illustrated as being round or of a cylindrical shape and it will be understood that the pins may be of any suitable shape in cross section and may be provided with means for preventing rotation of the pins in the openings.

The inner ends of the pins are illustrated as being arcuate and the coacting ends between the sections of the pins in the cylinder and the sections of the pins in the casing are also arcuate to correspond with the peripheral surface of the lock cylinder I0, as shown in Figure 2, and it will be understood that with the rows of pins positioned off center it is essential that the abutting or coacting ends of the pins be shaped to correspond with the line between the cylinder and casing. The inner ends of the pins are shown as being arcuate and with arcuate ends of the pins positioned on the meeting lines between the cylinder and easing the cylinder may be rotated or withdrawn.

The pins may be provided with flat sides or grooves may be provided therein with pins extended inwardly through the cylinder and casing to engage the grooves to prevent rotation of the pins of the look.

A key 24 adapted to be used with the lock is illustrated in Figure 7 wherein a cylindrical barrel formed with arcuate sides and 52 extends from a flange 53 with a shank 54 extending from the opposite side of the flange. One side-of the barrel is provided with a rib 55 adapted to register with the groove 23 of the cylinder '10 and the other side is provided with a slot 56 with the edges 51 and 58 of the sides 5| and 52 on opposite sides of the slot formed with hills and valleys positioned to register with the pins of'the cylinder. The rib 55 is also provided with an indentation 59 that is positioned to receive the pin l4 of the cylinder. The'barrel of the key and key slot of the cylinder may be provided with registering ribs and grooves as are generally used in locks of this type.

With the parts arranged in this manner the proper key may be inserted in the key slot of the cylinder I 0 and with the key holding the pins .in the proper positions with the ends of the pins of the cylinder at the surface thereof the cylinder may be'turned to open or close the look.

It will be understood that other modifications may be made in the design or arrangement of the parts without departing from the spirit of the invention.

What is claimed is:

In a cylinder lock, the combination which comprises a key actuated cylinder having a crescent shape key slot therein with the edges of the said slot extended inwardly toward a plane through the center of the said cylinder providing a substantially cylindrical core in the said key slot, said core having grooves in the sides, said cylinder having spaced rows of pin receiving openings extended from the said edges of the key slot to the surface of the cylinder, said pin receiving openings being positioned in parallel planes and with the openings of one row staggered in relation to the openings of the other row, said cylinder also having a longitudinally disposed groove'in the side of the key slot opposite to that in which the edges of the slot are positioned, and also having a pin receiving opening extended from the said groove to the outer surface of the cylinder, a lock bolt extended from theend of the cylinder opposite to that in which the key slot is positioned, a lock casing having a bore positioned to receive the said key actuated cylinder and having pin receiving openings therein positioned to register with the pin receiving openings of the cylinder, pins positioned in the said pin receiving openings of the casing and of the cylinder, and springs in the casing for urging the said pins in the openings in the casing inwardly and into the respective openings in the cylinder.

VICENTE SANTO DOMINGO BERNARDO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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