Combination lock preventing manipulation for unauthorized access

A combination lock comprising:

• a plurality of tumbler wheels, each having a fence gate formed into an outer perimeter thereof, said tumbler wheels arranged coaxially in stacked arrangement;
• a driving cam arranged coaxially with said tumbler wheels, said driving cam having a cam gate formed in a perimeter thereof;
• a latch reciprocally mounted in said housing to protrude outwardly thereof;
• a fence lever pivotally mounted to said latch at a base end thereof and extending to a distal end approximate said perimeter of said tumbler wheels;
• a fence connected to said fence lever and extending laterally thereof;
• a dial means for selectively aligning said fence gates of said tumbler wheels below said fence;
• a fence lever nose extending toward said driving cam and engageable to said cam gate when said fence is inserted into said fence gates;
• a first spring arranged between said fence lever and a stationary portion of said lock assembly for biasing said nose and said fence to an elevated position above said driving cam and said tumbler wheels respectively;
• said cam providing a roller extending rearwardly therefrom to orbit upon rotation of said cam;
• and
• a second spring arranged extending from said fence lever to said cam and engageable by said roller to resiliently urge said second spring downwardly to urge said nose and said fence downwardly during an arc portion of each full rotation of said dial means;
• wherein said second spring comprises a J-shaped wire spring, and said fence lever is pivotally attached to said latch and said J-shaped wire spring is wrapped around said pivotal connection and extends around said roller.

A combination lock comprising:

• a housing;
• a plurality of tumbler wheels, each having a fence gate formed into an outer perimeter thereof, said tumbler wheels arranged coaxially in stacked arrangement, said tumbler wheels arranged inside said housing;
• a driving cam arranged coaxially with said tumbler wheels;
• a fence lever pivotably and slidably mounted within said housing at a base end thereof, and extending to a distal end approximate said perimeter of said tumbler wheels;
• a fence connected to said fence lever and extending laterally thereof above said perimeter of said tumbler wheels;
• a dial means for selectively aligning said fence gates of said tumbler wheels below said fence upon correct dialing of a combination of numbers;
• a cam engaging means for engaging said driving cam when said fence is inserted into said fence gates;
• a means for biasing said fence lever in a rotary direction to elevate said fence above said perimeter of said tumbler wheels;
• a roller mounted eccentrically to said driving cam;
• an override spring arranged extending from said fence lever to said cam said override spring connected to said fence lever to slide therewith, and said override spring engageable by said eccentric roller to resiliently urge said override spring downwardly to urge said fence lever in a rotary direction to urge said fence downwardly during an arc portion of each full rotation of said dial means;
• a latch means for causing a locking of said combination lock to an adjacent structure, said latch operably connected to said fence lever for unlatching upon sliding movement of said fence lever.

A combination lock comprising:

• a housing;
• a plurality of tumbler wheels, each having a fence gate formed into an outer perimeter thereof, said tumbler wheels arranged coaxially in stacked arrangement, said tumbler wheels arranged inside said housing;
• a driving cam arranged coaxially with said tumbler wheels;
• a fence lever pivotably and slidably mounted within said housing at a base end thereof, and extending to a distal end approximate said perimeter of said tumbler wheels;
• a fence connected to said fence lever and extending laterally thereof above said perimeter of said tumbler wheels;
• a dial means for selectively aligning said fence gates of said tumbler wheels below said fence upon correct dialing of a combination of numbers;
• a cam engaging means for engaging said driving cam when said fence is inserted into said fence gates;
• a means for biasing said fence lever in a rotary direction to elevate said fence above said perimeter of said tumbler wheels;
• a roller mounted eccentrically to said driving cam;
• an override spring arranged extending from said fence lever to said cam and engageable by said eccentric roller to resiliently urge said override spring downwardly to urge said fence lever in a rotary direction to urge said fence downwardly during an arc portion of each full rotation of said dial means;
• a latch means for causing a locking of said combination lock to an adjacent structure, said latch operably connected to said fence lever for unlatching upon sliding movement of said fence lever;
• wherein said override spring comprises a J-shaped wire spring, and said fence, lever is pivotally attached to said latch and said J-shaped wire spring is wrapped around said pivotal connection and extends around said roller.

A combination lock comprising:

• a housing;
• a plurality of tumbler wheels, each having a fence gate formed into an outer perimeter thereof, said tumbler wheels arranged coaxially in stacked arrangement, said tumbler wheels arranged inside said housing;
• a driving cam arranged coaxially with said tumbler wheels;
• a fence lever pivotably and slidably mounted within said housing at a base end thereof, and extending to a distal end approximate said perimeter of said tumbler wheels;
• a fence connected to said fence lever and extending laterally thereof above said perimeter of said tumbler wheels;
• a dial means for selectively aligning said fence gates of, said tumbler wheels below said fence upon correct dialing of a combination of numbers;
• a cam engaging means for engaging said driving cam when said fence is inserted into said fence gates;
• a means for biasing said fence lever in a rotary direction to elevate said fence above said perimeter of said tumbler wheels;
• a roller mounted eccentrically to said driving cam;
• an override spring arranged extending from said fence lever to said cam and engageable by said eccentric roller to resiliently urge said override spring downwardly to urge said fence lever in a rotary direction to urge said fence downwardly during an arc portion of each full rotation of said dial means;
• a latch means for causing a locking of said combination lock to an adjacent structure, said latch operably connected to said fence lever for unlatching upon sliding movement of said fence lever;
• wherein said cam engaging means comprising a cam gate formed into a perimeter of said driving cam and a lever nose extending from said fence lever for interfittment into said cam gate;
• wherein solid said override spring comprises a J-shaped wire spring and said J-shaped wire spring is anchored into a hole extending into a back surface of said fence lever.

In a combination lock having a housing and a plurality of tumbler wheels within said housing, each having a fence gate formed into an outer perimeter thereof, said tumbler wheels arranged coaxially in stacked arrangement;

• a driving cam arranged coaxially with said tumbler wheels, said driving cam having a cam gate formed in a perimeter thereof;
• a latch reciprocally mounted in said housing to protrude outwardly thereof;
• a fence lever pivotally mounted at a pivot connection to said latch at a base end thereof and extending to a distal end approximate said perimeter of said tumbler wheels;
• a fence connected to said fence lever and extending laterally thereof;
• a dial means for selectively aligning said fence gates of said tumbler wheels below said fence;
• a fence lever nose extending toward said driving cam and engageable to said cam gate when said fence is inserted into said fence gates;
• a first spring arranged between said fence lever and a stationary portion of said lock assembly for biasing said nose and said fence to an elevated position above said drive cam and said tumbler wheels respectively, the improvement comprising:
• said cam providing a roller extending rearwardly therefrom to orbit upon rotation of said cam;
• and
• a second spring arranged extending from said base end of said fence lever to said cam and engageable by said roller to resiliently urge said second spring downwardly to urge said nose and said fence downwardly during a arc portion of each full rotation of said dial means.

In a combination lock having a housing and a plurality of tumbler wheels within said housing, each having a fence gate formed into an outer perimeter thereof, said tumbler wheels arranged coaxially in stacked arrangement;

• a driving cam arranged coaxially with said tumbler wheels, said driving cam having a cam gate formed in a perimeter thereof;
• a latch reciprocally mounted in said housing to protrude outwardly thereof;
• a fence lever pivotally mounted at a pivot connection to said latch at a base end thereof and extending to a distal end approximate said perimeter of said tumbler wheels;
• a fence connected to said fence lever and extending laterally thereof;
• a dial means for selectively aligning said fence gates of said tumbler wheels below said fence;
• a fence lever nose extending toward said driving cam and engageable to said cam gate when said fence is inserted into said fence gates;
• a first spring arranged between said fence lever and a stationary portion of said lock assembly for biasing said nose and said fence to an elevated position above said drive cam and said tumbler wheels respectively, the improvement comprising:
• said cam providing a roller extending rearwardly therefrom to orbit upon rotation of said cam;
• and
• a second spring arranged extending from said fence lever to said cam and engageable by said roller to resiliently urge said second spring downwardly to urge said nose and said fence downwardly during a arc portion of each full rotation of said dial means;
• wherein said second spring comprises a J-shaped wire spring, and said fence lever is pivotally attached to said latch and said J-shaped wire spring is wrapped around said pivotal connection and extends around said roller.