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Publication numberUS3802234 A
Publication typeGrant
Publication dateApr 9, 1974
Filing dateFeb 28, 1973
Priority dateFeb 28, 1973
Also published asCA970988A1
Publication numberUS 3802234 A, US 3802234A, US-A-3802234, US3802234 A, US3802234A
InventorsJ Gerlach
Original AssigneeEmhart Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pick-resistant lock construction including jamming feature
US 3802234 A
Abstract
A keyed, pin tumbler type lock has one or a series of jamming pin members in the casing intermediate the path of rotation of the lock cylinder between locked and unlocked positions. Attempted rotation of the lock cylinder from locked toward unlocked position without use of the key permits the jamming pin members to move inwardly partially into the lock cylinder jamming it against further rotation to the unlocked position. The jamming pin members are axially split pins outwardly axially abutted by spring urged wedge members which force the split pins partially into the lock cylinder pin openings while radially separating the split pins to engage them axially outward with casing shoulders, thereby permanently positioning the jamming pins in lock cylinder jamming position.
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Description  (OCR text may contain errors)

United States Patent 1191 Gerlach [54] PICK-RESISTANT LOCK CONSTRUCTION INCLUDING JAMMING FEATURE [75] Inventor: John R. Gerlach, Monterey Park,

Calif.

[73] Assignee: ,Emhart Corporation, Bloomfield,

Conn.

[22] Filed: Feb. 28, 1973 [21] Appl. N0.: 336,838.

52 us. c1. 70/421, 70/378 [51] int. Cl.-. E05b 15/l4, E05b 63/00 [58] Field of Search 70/15, 364 -A, 378, 421,

[56] References Cited UNITED STATES PATENTS 1,707,922 4/1929 Pepper 70/421 2,836,973 6/1958 Schillizzi- 70/421 3,195,330 7/1965 Bauer 70/421 5/l965 liiauermi. 70/421 1111 3,802,234 1451 Apr. 9, 1974 Primary liraminer Robert L'. Wolfe "Attorney, Agent, or Firm-Mahoney, Schick & Cislo [5 7] ABSTRACT A keyed, pin tumbler type lock has one or a series of jamming pin members inthe casing intermediate the path of rotation of the lock cylinder between locked and unlocked positions. Attempted rotation of. the

: lock cylinder from locked toward unlocked position without used the key permits the jamming pin members to move inwardly partially into the-lock. cylinder jamming it against further-rotation to the unlocked po- 1 sition. The jamming pin members are axially split pins outwardly axially abutted by spring urged wedge members which force the split pins partiallyinto the lock cylinder pin openings while radially separating the split pins to engage them;' axially outward with casing I shoulders; thereby permanently positioning the jamming pins in lock cylinder jamming position.

11 Claims, 4 Drawing Figures PICK-RESISTANT LOCK CONSTRUCTION INCLUDING JAMMING FEATURE BACKGROUND OF THE INVENTION This invention relates to a pick-resistant lock construction including a jamming feature, and more particularly, to a lock construction having a unique and highly positive form of pick-resistant jamming means incorporated therein which is passive during the normal operation of the lock using proper unlocking procedure, but which is automatically operable to jam the lock and positively prevent movement into unlocked position upon an attempted improper unlocking procedure being used. Even more particularly, the pick resistant jamming means of the lock makes use of an axially split jamming member or members in combination with wedge means always bearing axially thereagainst so that upon jamming condition, the wedge means separates the jamming member parts to jam the lock against further movement into unlocked position.

Various prior forms of pick-resistant lock constructions incorporating sundry jamming features have heretofore been provided, none of which, prior to the present invention, have been completely satisfactory. Those prior constructions which have not been prohibitivefrom the economic standpoint have not been totally positive in automatic operation lending to a situation of being relatively easily frustrated. Where totally positive operation for positive jamming has been successfully incorporated, the costs thereof for the provisions of the same have been excessive.

Considering for example the incorporation of a pickresistant jamming feature in a common'pin tumbler type of lock wherein the usual normal locking pins retain a lock cylinder against rotation from a locked position and a key of proper configuration is used to position the normal locking pins for rotation of the lock cylinder to an unlocked position, it is relatively easy to incorporate one or more jamming pins. A jamming pin may be installed in the lock casing intermediate the path of rotation of the lock cylinder between locked and unlocked position and the jamming pin may be retained totally within the lock casing during normal lock operation through the properly configured key and the part of one of the normal locking pins remaining in the lock cylinder during normal key operated movement thereof. When, however, through picking or other similar manipulation, the normal locking pins are released without use of the key and the lock cylinder is moved toward unlocked position necessarily passing the jamming pin location, the jamming pin may be resiliently urged inwardly partially into the cylinder pin hole so as to jam the lock cylinder against further rotative movement. 7

Assuming that the jamming pin is merely a conventional, cylindrical pin segment just as may be found in the normal locking pins of the lock, its mounting may be relatively simple and its operation or movement into jamming posture may be of a relatively positive nature. The prime difficulty is that such a jamming pin may be relatively easily picked or manipulated in the same manner as were the normal locking pins. Thus, although the surreptitious lock manipulation may be slightly more difficult, it can be accomplished in the same manner without great difficulty to those expert in that form of lock manipulation.

For this reason, various of the prior constructions have included more complex jamming pins. Again, as an example, many of these prior forms of locks including the jamming features have added various keeper arrangements assembled in the lock casing adjacent the jamming pin for engaging the jamming pin once the same has moved inwardly into its jamming position for positively retaining the jamming pin in such jamming position. Although these complex arrangement have added to the problems of positive operation of the jamming pin or pins, a major difficulty therewith has been that they are relatively complicated and require additional expert workmanship markedly increasing the cost of provision of lock constructions incorporating the same.

Despite the relatively extensive development of pick resistant jamming features for locks, therefore, there still is a long-felt want and need for satisfying the basic desires for a pick resistant lock. As herein-before stated, the pick-resistant jamming feature must be of absolute positive operation, not capable of being easily picked or manipulated. At the same time, the pickresistant jamming feature must be of a relatively simple nature and capable of being incorporated in conventional lock constructions for a minimum of added cost.

OBJECTS AND SUMMARY OF THE INVENTION It is, therefore, an object of this invention to provide a pick-resistant lock construction including a jamming feature wherein the lock has a unique and highly positive form of pick-resistant jamming means therein passive during normal operation of the lock using proper unlocking procedures, but automatically operable to jam the lock and positively prevent movement into unlocked position upon attempted improper unlocking procedures being used. According to the broader principles of the present invention, a radially separable jamming member is used capable of movement from a radially closed non-jamming position to a radially sepa rated jamming position, such radial separation in the jamming position being accomplished by wedge means constantly bearing axially against the jamming member and constantly wedge urging the jamming member into its-radially separated jamming position. Thus, the jamming member remains passive in its radially closed nonjamming position during normal operation of the lock, but on improper operation of the lock, the jamming member is automatically radially separated by the wedge means to jam the lock against further movement preventing unlocking.

It is a further object of this invention to provide a pick-resistant lock construction including a jamming feature which, in the preferred form or forms thereof, not only is positively operable upon attempted picking or similar improper operation of the lock to jam the lock against unlocking, but once'moved into its jamming position, will be secured in such jamming position and cannot be moved therefrom without virtual lock destruction. A preferred embodiment of the lock construction of the present invention includes an axially split and axially movable jamming pin with a wedge member resiliently urged axially thereagainst tending to move the jamming pin axially and radially separate the same. The combined jamming pin and resiliently urged wedge member are retained in the lock casing passive during normal operation of the lock, but upon 3 lock improper operation such as by picking, the jamming pin is automatically urged axially inwardly by the wedge member and into partial reception within the lock operating member or cylinder jamming the lock operation member or cylinder against further movement toward its unlocked-position. At the same time, the wedge member also radially separates the jamming pin and forces the jamming member separated parts behind shoulders of the lock casing positively preventing the jamming member from again moving outwardly to non-jamming position and permanently jamming the lock.

It is also an object of this invention to provide a pick resistant lock construction including a jamming feature which satisfies either or both of the foregoing objects, yet which may be provided with little alteration to present lock constructions not having a pick-resistant feature therein and which may be provided at a minimum of added expense fully justified by the added security features involved. For instance; considering for example a common pin tumbler type of lock, it is only necessary to addpin openings in the lock casing of a number commensurate with the number of jamming members to be provided, such pin openings being located intermediate the path of travel of the operating member or cylinder between locked and unlocked position. The assembly of the radially separable jamming members and their resiliently urged wedge means is a simple as sembly operation quite similar to the assembling of the conventional locking pins since everthing is assembled in the previously formed added pin openings.

BRIEF DESCRIPTION OF THE DRAWING FIG. I is a fragmentary, vertical sectional view of a typical pin tumbler type of lock incorporating anembodiment of the pick-resistant jamming feature of the present invention, the lock cylinder being shown in locked position with a properly configured key positioning the normal locking pins ready for unlocking rotation of the lock cylinder;

FIG. 2 is a vertical sectional view looking in the di-.

rection of the arrows 2-2 in FIG. 1 and showing the assembly forming the jamming feature retained passive in non-jamming position;

FIG. 3 is a view similar to FIG. 2 but with the lock cylinder rotated by the key intermediate the lock cylinder rotation between locked and unlocked position, the key and a normal locking pin segment retaining the assembly forming the jamming feature passive in nonjamming position; and

FIG. 4 is a view similar to FIG. 3, but with the key removed and the assembly forming the jamming feature moved to jamming position.

DESCRIPTION OF THE BEST EMBODIMENT CONTEMPLATED Referring to the drawings, a preferred embodiment of the pick-resistant jamming feature of the present invention is illustrated in a typical pin tumbler type of lock including a casing circumferentially rotatably mounting an operating member in the form of a lock cylinder 12. It is pointed out, however, as will be hereinafter more apparent to those skilled in the art, that the pick-resistant jamming feature principles of the present invention are likewise applicable to many forms of conventional locks whether the pin tumbler type or otherwise and regardless of the direction of movement of the operating member or members. Thus, in consideration of the principles of the present invention, the same should be broadly construed within the limitations of the appended claims hereof.

The lock cylinder 12 for this form of lock is a keyed radially aligned with casing pin openings when the lock cylinder is in its locked position as shown in FIGS. 1 and 2. Positioned primarily within the cylinder pin openings 18 is'a series of radially movable cylinder pin segments 22 which, when the lock cylinder 12 is positioned in the FIG. 1 and 2 locked position, are radially inwardly axially abutted by a series of easing pin segments 24 resiliently urged axially inwardly, radially of the lock cylinder l2 and the casing 10 by a series of coil pin springs 26.

As is usual, the cylinder pin segments 22 are formed of various axial lengths commensurate with the configuration of the key 16 so that when the key having the proper configuration is inserted in the key slot 14, the key will position the cylinder pin segments 22 with their outer ends exactly at the periphery of the lock cylinder 12 and the casing pin segments 24 with their inner ends exactly at this lock cylinder periphery. Thus, this will position the cylinder and casing pin segments 22 and 24 in a movement non-frustrating position of the lock cylinder l2 and permit rotative movement of the lock cylinder from the locked position shown in FIGS. 1 and 2 to an unlocked position (not shown) rotated in the order of to counter-clockwise looking in the direction of FIG. 2. When, however, an improperly configured key is inserted in the key slot 14 or no key is inserted therein, the separation between the cylinder and easing pin segments'22 and 24 with at least'some of these abutting pin segments will be radially displaced from the periphery of the lock cylinder 12 when the lock cylinder is in the locked position shown in FIGS. 1 and 2 so that these pin segments will effectively block rotation of the lock cylinder to frustrate movement thereof and prevent movement from the locked toward the unlocked position. As thus far described, of course, the lock construction comprises a usual pin tumbler type of lock operable in the usual manner, all well known to those skilled in the art.

More particularly to the pick-resistant jamming feature of the present invention, at least one jamming means generally-indicated at 28 is formed in the casing 10 intermediate the path. of rotation of the lock cylinder 12 between its locked and unlocked positions. For maximum security, one of the jamming means 28 will be located circumferentially aligned with each of the casing pin openings 20 at this intermediate rotative position of the lock cylinder 12 between its locked and unlocked positions. For the present purposes of description, however, each of the jamming means 28 may be substantially the same so that only one is shown and described herein circumferentially aligned with the midway of the casing pin openings 20.

As shown, the jamming means 28 includes a jamming pin opening 30 radially aligned with the lock cylinder 12 and opening axially toward the lock cylinder. The

. jamming pin opening 30 is formed with a cylindrical outer reduced portion 32 opening axially inwardly into a cylindrical inner and enlarged portion 34 forming an annular shoulder 36 therebetween. Assembled within the jamming pin opening 30 starting at an outer closed end thereof is resilient means in the form of a coil spring 38 bearing axially inwardly against wedge means in the form of a wedge member 40 which, in turn, bears axially inwardly against an axially split, radially separable jamming pin 42.

The coil spring 38 is retained in a compressed condition in all positions of the wedge member 40 and the jamming pin 42. The wedge member 40 is preferably generally cylindrical with a generally conical inward leading end 44 inwardly abutting and received in a similar conical recess 46 formed preferably one-half in each of the split segments of the jamming pin 42.

As shown in FIGS. 2 and 3, the respective lengths of the outer reduced portion 32 and inner enlarged portion 34 of the jamming pin opening 30 and that of the jamming pin 42 are such that when the jamming pin is fully retained within the jamming pin opening, the jamming pin is maintained closed in a non-jamming position merely being borne against by the wedge member 40 as urged by the coil spring 38. When, however, the inner end of the wedge member 40 is received partially axially inwardly into the respective cylinder pin opening 18, the outer end of the jamming pin passes axially inwardly of the shoulder 36 in the jamming pin opening 30 and the jamming pin split segments are urged radially outwardly to axially outwardly engage the shoulder by the wedge member 40 being forced axially relative to the jamming pin by the coil spring 38.

In operation of the pin tumbler type of lock incorporating the pick-resistant jamming feature of the present invention, therefore, with the lock cylinder 12 in its locked position and without insertion of the key 16, the normal locking pins comprised of the cylinder and casing pin segments 22 and 24 will be urged axially inwardly by the coil pin springs 26 to block rotative movement of the lock cylinder 12 from the locked position in the usual manner. Furthermore, when a properly configured key 16 is inserted in the key slot 14 of the lock cylinder 12, the cylinder and easing pin segments 22 and 24 will be positioned as shown in FIGS. 1 and 2 so that the parting line between the cylinder and easing sets of these pin segments will be exactly at the periphery of the lock cylinder permitting rotative movement of the lock cylinder from the locked position toward unlocked position. As shown in FIG. 2, during positioning of the lock cylinder 12 in the locked position and regardless of the condition of the cylinder and easing pin segments 22 and 24, the jamming pin 42 will be retained fully within the casing by the periphery of the lock cylinder 12, and during the proper rotation of the lock cylinder between its locked position and unlocked position using the properly configured key 16, as the appropriate cylinder pin segment 22 arrives circumferentially at the jamming pin opening 30, the jamming pin 42 will still be retained fully within the casing 10 by this cylinder pin segment 22 as shown in FIG. 3. Thus, in proper operation and using the properly configured key 16, the jamming means 28, whether one assembly or a series of assemblies, cannot affect the proper operation of the lock and the proper movement of the lock cylinder 12 from locked to unlocked and back to locked position.

Assume, however,'that the lock cylinder 12 is in the locked position, no properly configured key 16 is used and the lock is picked in the usual manner. In such picking, the casing pin segments 24 would be raised to at least the periphery of the lock cylinder 12 so that these pin segments would no longer frustrate movement of the lock cylinder and it would be begun rotation from the locked position toward the unlocked position. In such case, as the cylinder pin openings 18 arrive at the jamming pin opening 30, the appropriate cylinder pin segment 22 will be at a lowered position as shown in FIG. 4 in view of the key 16 being lacking to retain the same upwardly and this will permit the spring urged wedge member 40 to urge the jamming pin 42 axially inwardly to engage partially within the appropriate cylinder pin opening. At the same time, as the jamming pin 42 moves inwardly into its jamming position fully inwardly of the shoulder 36 of the jamming pin opening 30, the wedge member 40 will move axially relative to and more fully within the jamming pin 42 spreading the split segments of the jamming pin permanently engaging the jamming pin segments in axial outward interference with the shoulder 36 in view of the constant pressure of the coil spring 38 against the wedge member 40.

Thus, in the attempted picking, the lock cylinder 12 is permanently jammed against further rotation and against rotation to the unlocked position. Furthermore, even though further picking is attempted, it is impossible to move the jamming pin 42 outwardly to once again permit rotation of the lock cylinder 12 since the jamming pin split segments are permanently radially separated and retained against the shoulder 36 by the constant pressure of the wedge member 40. This wedge separation of the jamming pin 42 by the wedge member 40 upon the movement of the jamming pin from its outer non-jamming position to its inner jamming position thereby completely frustrates operation of the lock despite the picking thereof.

According to the principles of the present invention, therefore, a pick-resistant lock construction including the unique jamming feature is provided which is not only of highly positive jamming form upon picking thereof being attempted and once the jamming position is assumed, the same is permanently retained, but the jamming feature can be installed in presently existing locks with only slight alteration adding a minimum of expense. As can be clearly seen, one or more of the jamming pin openings 30 can be added to a conventional casing 10 by nearly the same procedures as are used for forming the normal casing pin openings 20, the

only difference of the jamming pin openings 30 being that they are shouldered openings. To complete the jamming means 28, it is then merely necessary to install the assembly of the coil spring 38, wedge member 40 and jamming pin 42, again in a similar manner to the normal installation of the coil pin springs 26 and easing pin segments 24.

I claim:

1. In a pick-resistant lock construction; the combination: a casing; an operating member normally movable in said casing between locked and unlocked positions; movement frustrating means operably associated with said operating member normally frustrating movement of said operating member from said locked position; unlocking means properly operable with said operating member for interrupting operation of said movement frustrating means and permitting movement of said operating member from said locked position to said unlocked position; jamming means operably associated with said operating member automatically actionable upon said operating member being moved from said locked toward said unlocked position without use of said unlocking means for jamming said operating member against further movement including a radially separable jamming member movable from a radially closed non-jamming to a radially separated jamming position, wedge means constantly bearing axially against said jamming member and constantly wedge urging said jamming member toward said radially separated jamming position, said unlocking means during proper operation with said operating member retaining said jamming member in said radially closed non-jamming position during movement of said operating member from said locked to said unlocked position, said wedge means moving axially relative to said jamming member and wedge radially separating said jamming member into said jamming position upon said operating member being moved from said locked toward said unlocked position without use of said unlocking means.

2. A pick-resistant lock construction as defined in claim 1 in which said wedge means moves said jamming member axially from said non-jamming to said jamming position and wedge radially separates said jamming member at least in said jamming position.

3. A pick-resistant lock construction as defined in claim 1 in which said jamming member includes an axially split and axially movable pin fully within said casing in said radially closed non-jamming position and being movable axially partially into said operating member in said jamming position; in which shoulder means is formed in said casing axially intermediate said jamming member in said jamming member nonjamming position and axially outward of said jamming member in said jamming member jamming position; and in which said wedge means moves said jamming member axially inward from said jamming member non-jamming position to said jamming member jamming position, said wedge means wedge radially separating said jamming member in said jamming position engaging said jamming member with said casing shoulder means to resist subsequent axial outward movement of said jamming member from said jamming position.

4. A pick-resistant lock construction as defined in claim 1 in which said jamming member includes an axially split and axially movable pin fully within said casing in said radially closed non-jamming position and being movable axially inwardly partially into said operating member in said jamming position, said jamming member having a recess formed in an outer end thereof partially in each of radially separable portions thereof;

in which shoulder means is formed in the said casing axially intermediate said jamming member in said jamming member non-jamming position and axially outward of said jamming member in said jamming member jamming position; and in which said wedge means includes a wedge member in said casing having an axially inwardly projecting wedge-shaped end portion constantly received in said jamming member end recess, resilient means in said casing constantly urging said wedge member axially inwardly toward said jamming member, said wedge member moving said jamming member axially inward from said jamming member non-jamming position tosaid jamming member jamming position, said wedge member wedge radially separating said jamming member in said jamming position engaging said jamming member with said casing shoulder means to resist subsequent axial outward movement of said jamming member from said jamming position.

5. A pick-resistant lock construction as defined in claim 1 in which said operating member includes a lock cylinder; in which said movement frustrating means includes a series of pin tumbler means each having portions in said casing and portions in said lock cylinder, said pin tumbler means normally blocking movement of said lock cylinder in said locked position; in which said unlocking means includes a key properly operable in said lock cylinder moving said pin tumbler means to a position free of blocking said lock cylinder movement and permitting movement of said lock cylinder from said locked position to said unlocked position; and in which said jamming means is operably associated with said casing and said lock cylinder automatically actionable upon said lock cylinder being moved from said locked toward said unlocked position without use of said key for jamming said lock cylinder against further movement.

6. A pick-resistant lock construction as defined in claim 1 in which said operating member includes a lock cylinder; in which said movement frustrating means includes a series of pin tumbler means each having portions in said casing and portions in said lock cylinder, said pin tumbler means normally blocking movement of said lock cylinder in said locked position; in which said unlocking means includes a key properlyoperable in said lock cylinder moving said pin tumbler means to a position free of blocking said lock cylinder movement and permitting movement of said lock cylinder from said locked position to said unlocked position; and in which said jamming means is operably associated with said casing and said lock cylinder automatically actionable upon said lock cylinder being moved from said locked toward said unlocked position without use of said key for jamming said lock cylinder against further movement, said wedge means moving said jamming member axially from said non-jamming to said jamming position and wedge radially separating said jamming member at least in said jamming position.

7. A pick-resistant lock construction as defined in claim 1 in which said operating member includes a lock cylinder; in which said movement frustrating means includes a series of pin tumbler means each having portions in said casing and portions in said lock cylinder, said pin tumbler means normally blocking movement of said lock cylinder in said locked position; in which said unlocking means includes a key properly operable in said lock cylinder moving said pin tumbler means to a position free of blocking said lock cylinder movement and permitting movement of said lock cylinder from said locked position to said unlocked position; in which said jamming means is operably associated with said casing and said lock cylinder automatically actionable upon said lock cylinder being moved from said locked toward said unlocked position without use of said key for jamming said lock cylinder against further move ment, said jamming member including an axially split and axially movable pin fully within said casing in said radially closed non-jamming position and being movable axially partially into said lock cylinder in said jamming position; in which shoulder means is formed in said casing axially intermediate said jamming member in said jamming member non-jamming position and axially outward of said jamming member in said jamming member jamming position; and in which said wedge means moves said jamming member axially inward from said jamming member non-jamming position to said jamming member jamming position, said wedge means wedge radially separating said jamming member in said jamming position engaging said jamming member with said casing shoulder means to resist subsequent axial outward movement of said jamming member from said jamming position.

8. A pick-resistant lock construction as defined in claim 1 in which said operating member includes a lock cylinder; in which said movement frustrating means includes a series of pin tumbler means each having portions in said casing and portions in said lock cylinder, said pin tumbler means normally blocking movement of said lock cylinder in said locked position; in which said unlocking means includes a key properly operable in said lock cylinder moving said pin tumbler means to a position free of blocking said lock cylinder movement and permitting movement of said lock cylinder from said locked position to said unlocked position; in which said jamming means is operably associated with said casing and said lock cylinder automatically actionable upon said lock cylinder being moved from said locked toward said unlocked position without use of said key for jamming said lock cylinder against further movements; in which said jamming member includes an axially split and axially movable pin fully within said casing in said radially closed non-jamming position and being movable axially inwardly partially into said lock cylinder in said jamming position, said jamming member having a recess formed in an outer end thereof partially in each of radially separable portions thereof; in which shoulder means is formed in said casing axially intermediate said jamming member in said jamming member non-jamming position and axially outward of said jamming member in said jamming member jamming position; and in which said wedge means includes a wedge member in said casing having an axially inwardly projecting wedge-shaped end portion constantly received in said jamming member recess, resilient means in said casing constantly urging said wedge member axially inwardly toward said jamming member, said wedge member moving said jamming member axially inward from said jamming member non-jamming position to said jamming member jamming position, said wedge member wedge radially separating said jamming member in said jamming position engaging said jamming member with said casing shoulder means to resist subsequent axial outward movement of said jamming member from said jamming position.

9. A pick-resistant lock construction as defined in claim 1 in which said operating member includes a lock cylinder rotatable in said casing; in which said movement frustrating means includes a series of pin tumbler means each having portions in said casing and portions in said lock cylinder, said pin tumbler means normally blocking rotation of said lock cylinder in said locked position; in which said unlocking means includes a key properly operable in said lock cylinder moving said pin tumbler means to a position free of blocking said lock cylinder rotation and permitting rotation of said lock cylinder from said locked position to said unlocked position; and in which said jamming means is operably associated with said casing and said lock cylinder automatically actionable upon said lock cylinder being rotated from said locked toward said unlocked position without use of said key for jamming said lock cylinder against further rotative movement, said wedge means moving said jamming member axially from said nonjamming to said jamming position and wedge radially separating said jamming member at least in said jamming position.

10. A pick-resistant lock construction as defined in claim 1 in which said operating member includes a lock cylinder rotatable in said casing; in which said movement frustrating means includes a series of pin tumbler means each having portions in said casing and portions in said lock cylinder,,said pin tumbler means normally blocking rotative movement of said lock cylinder in said locked position; in which said unlocking means includes a key properly operable in said lock cylinder moving said pin tumbler means to a position free of blocking said lock cylinder rotative movement and permitting rotative movement of said lock cylinder from said locked position to said unlocked position; in which said jamming means is operably associated with said casing and said lock cylinder automatically actionable circumferentially intermediate said lock cylinder locked and unlocked position upon said lock cylinder being rotated from said locked toward said unlocked position without use of said key for jamming said lock cylinder against further rotative movement, said jarnming member including an axially split and axially movable pin fully within said casing in said radially closed non-jamming position and being moved axially partially into said lock cylinder in said jamming position; in which shoulder means is formed in said casing axially intermediate said jamming member in said jamming member non-jamming position and axially outward of said jamming member in said jamming member jamming position; and in which said wedge means moves said jamming member axially inward from said jamming member non-jamming position to said jamming member jamming position, said wedge means wedge radially separating said jamming member in said jamming position engaging said jamming member with said casing shoulder means to resist subsequent axial outward movement of said jamming member from said jamming position.

11. A pick-resistant lock construction as defined in Claim 1 in which said operating member includes a lock cylinder rotatable in said casing; in which said movement frustrating means includes a series of pin tumbler means each having portions in said casing and portions in said lock cylinder, said pin tumbler means normally blocking rotative movement of said lock cylinder in said locked position; in which said unlocking means includes a key properly operable in said lock cylinder moving said pin tumbler means to a position free of blocking said lock cylinder rotative movement and permitting rotation of said lock cylinder from said locked position to said unlocked position; in which said jamming means is operably associated with said casing and said lock cylinder automatically actionable intermediate said lock cylinder locked and unlocked positions upon said lock cylinder being rotated from said locked toward said unlocked position without use of said key for jamming said lock cylinder against further rotative movement; in which said jamming member ineludes an axially split and axially movable pin fully within said casing in said radially closed non-jamming position and being movable axially inwardly partially into said lock cylinder in said jamming position, said jamming member having a recess formed in an outer end thereof partially in each of radially separable portions thereof; in which shoulder means is formed in said casing axially intermediate said jamming member in said jamming member non-jamming position and axially outward of said jamming member in said jamming member jamming position; and in which said wedge means includes a wedge member in said casing having an axially inwardly projecting wedge-shaped end portion constantly received in said jamming member end recess, resilient means in said casing constantly urging said wedge member axially inwardly toward said jamming member, said wedge member moving said jamming member axially inward from said jamming member non-jamming position to said jamming member jamming position, said wedge member moving axially relative to said jamming member wedge radially separating said jamming member in said jamming position engaging said jamming member with said casing shoul der means to resist subsequent axial outward movement of said jamming member from said jamming position.

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4380163 *Sep 8, 1981Apr 19, 1983Reder Kenneth JTamper-resistant lock
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US5079936 *Nov 20, 1990Jan 14, 1992Folger Adam CompanyHigh security cylinder lock
US7272965 *Jul 31, 2003Sep 25, 2007Moshe DolevMethod and assembly to prevent impact-driven manipulation of cylinder locks
US7810365Jun 14, 2007Oct 12, 2010Schlage Lock CompanyLock cylinder with locking member
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DE19934883C1 *Jul 24, 1999Jan 18, 2001Wagner Alexander JosefKey-operated door lock has lock cylinder rotated by inserted key and blocked against manipulation by clamp element contained in bore in lock cylinder housing
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DE102005059439B4 *Dec 13, 2005Jan 31, 2008Söhngen, DorisSchließzylinder, insbesondere für ein Türschloss
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Classifications
U.S. Classification70/421, 70/378
International ClassificationE05B27/00
Cooperative ClassificationE05B27/0064, E05B27/0021
European ClassificationE05B27/00P1A, E05B27/00A3B
Legal Events
DateCodeEventDescription
Apr 29, 1991ASAssignment
Owner name: EMHART INC., A DELAWARE CORPORATION, DELAWARE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KWIKSET CORPORATION, A CALIFORNIA CORPORATION;REEL/FRAME:005691/0310
Effective date: 19910425
Apr 29, 1991AS02Assignment of assignor's interest
Owner name: EMHART INC., A DELAWARE CORPORATION DRUMMOND PLAZA
Effective date: 19910425
Owner name: KWIKSET CORPORATION, A CALIFORNIA CORPORATION
May 21, 1986ASAssignment
Owner name: KWIKSET CORPORATION, 516 EAST SANTA ANA STREET, AN
Free format text: ASSIGNOR HEREBY CONFIRMS THE ENTIRE INTEREST IN SAID PATENTS AS OF DECEMBER 31, 1985 TO SAID ASSIGNEE.;ASSIGNOR:EMHART INDUSTRIES, INC. A CORP. OF CT.;REEL/FRAME:004561/0851
Effective date: 19860508
Owner name: KWIKSET CORPORATION,CALIFORNIA
Free format text: ASSIGNOR HEREBY CONFIRMS THE ENTIRE INTEREST IN SAID PATENTS AS OF DECEMBER 31, 1985 TO SAID ASSIGNEE;ASSIGNOR:EMHART INDUSTRIES, INC. A CORP. OF CT.;REEL/FRAME:4561/851
Free format text: ASSIGNOR HEREBY CONFIRMS THE ENTIRE INTEREST IN SAID PATENTS AS OF DECEMBER 31, 1985 TO SAID ASSIGNEE;ASSIGNOR:EMHART INDUSTRIES, INC. A CORP. OF CT.;REEL/FRAME:004561/0851
Owner name: KWIKSET CORPORATION, CALIFORNIA