Motorized electric strike
First Claim
1. An electric strike, comprising:
- a housing;
a keeper pivotally mounted in the housing, the keeper having an open position and a closed position;
a plunger having an extended position and a retracted position, wherein the plunger is structured to engage the keeper when the keeper is in the closed position, and is structured to move from the extended position toward the retracted position in response to movement of the keeper from the closed position toward the open position;
a cage including an aperture, wherein the plunger is movably seated in the cage;
a locking element movably seated in the aperture and engaged with the plunger, wherein the plunger is structured to urge the locking element radially outward as the plunger moves from the extended position toward the retracted position;
a sleeve having a locking position and an unlocking position, wherein the sleeve is structured to prevent radially outward movement of the locking element and retraction of the plunger when in the locking position, and to permit radially outward movement of the locking element and retraction of the plunger when in the unlocking position;
a transmission having a lock-setting position and an unlock-setting position;
a motor drivingly coupled to the transmission;
a lost motion connection formed between the sleeve and the transmission, the lost motion connection permitting the sleeve to remain in the unlocking position when the transmission is in the lock-setting position, wherein the lost motion connection is defined by forked portions of the sleeve and the transmission and includes a first gap between adjacent prongs of the forked portions which allows the transmission to rotate to the lock-setting position while the sleeve is retained in the unlocking position, and the lost motion connection further includes a second gap between the adjacent prongs of the forked portions so that the sleeve is rotatable toward the locking position in response to the sleeve being released from the unlocking position and the transmission being in the lock-setting position, and wherein the lost motion connection further includes a spring that biases the sleeve toward the locking position; and
an anti-tamper mechanism structured to retain the sleeve in the unlocking position when the keeper is in the open position.
1 Assignment
0 Petitions
Accused Products
Abstract
An exemplary electric strike includes a housing and a keeper pivotally mounted in the housing. The strike also includes a plunger having an extended position and a retracted position, a cage including an aperture, and a locking element movably seated in the aperture. The locking element is engaged with the plunger, and the plunger is structured to urge the locking element radially outward as the plunger moves from an extended position toward a retracted position. The strike also includes a sleeve, a transmission engaged with the sleeve, and a motor drivingly coupled to the transmission. The sleeve is structured to selectively prevent radially outward movement of the locking element and retraction of the plunger. The strike also includes at least one of a lost motion connection and an anti-tamper mechanism.
52 Citations
21 Claims
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1. An electric strike, comprising:
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a housing; a keeper pivotally mounted in the housing, the keeper having an open position and a closed position; a plunger having an extended position and a retracted position, wherein the plunger is structured to engage the keeper when the keeper is in the closed position, and is structured to move from the extended position toward the retracted position in response to movement of the keeper from the closed position toward the open position; a cage including an aperture, wherein the plunger is movably seated in the cage; a locking element movably seated in the aperture and engaged with the plunger, wherein the plunger is structured to urge the locking element radially outward as the plunger moves from the extended position toward the retracted position; a sleeve having a locking position and an unlocking position, wherein the sleeve is structured to prevent radially outward movement of the locking element and retraction of the plunger when in the locking position, and to permit radially outward movement of the locking element and retraction of the plunger when in the unlocking position; a transmission having a lock-setting position and an unlock-setting position; a motor drivingly coupled to the transmission; a lost motion connection formed between the sleeve and the transmission, the lost motion connection permitting the sleeve to remain in the unlocking position when the transmission is in the lock-setting position, wherein the lost motion connection is defined by forked portions of the sleeve and the transmission and includes a first gap between adjacent prongs of the forked portions which allows the transmission to rotate to the lock-setting position while the sleeve is retained in the unlocking position, and the lost motion connection further includes a second gap between the adjacent prongs of the forked portions so that the sleeve is rotatable toward the locking position in response to the sleeve being released from the unlocking position and the transmission being in the lock-setting position, and wherein the lost motion connection further includes a spring that biases the sleeve toward the locking position; and an anti-tamper mechanism structured to retain the sleeve in the unlocking position when the keeper is in the open position. - View Dependent Claims (3, 4, 5, 6, 7, 20, 21)
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2. An electric strike, comprising:
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a housing; a keeper pivotally mounted in the housing, the keeper having an open position and a closed position; a plunger having an extended position and a retracted position, wherein the plunger is structured to engage the keeper when the keeper is in the closed position, and is structured to move from the extended position toward the retracted position in response to movement of the keeper from the closed position toward the open position; a cage including an aperture, wherein the plunger is movably seated in the cage; a locking element movably seated in the aperture and engaged with the plunger, wherein the plunger is structured to urge the locking element radially outward as the plunger moves from the extended position toward the retracted position; a sleeve having a locking position and an unlocking position, wherein the sleeve is structured to prevent radially outward movement of the locking element and retraction of the plunger when in the locking position, and to permit radially outward movement of the locking element and retraction of the plunger when in the unlocking position; a transmission having a lock-setting position and an unlock-setting position; a motor drivingly coupled to the transmission; a lost motion connection formed between the sleeve and the transmission, the lost motion connection permitting the sleeve to remain in the unlocking position when the transmission is in the lock-setting position; and an anti-tamper mechanism structured to retain the sleeve in the unlocking position when the keeper is in the open position, wherein the anti-tamper mechanism includes a first engagement feature formed on the keeper and a second engagement feature formed on the sleeve, wherein the first engagement feature is structured to engage the second engagement feature when the sleeve is in the unlocking position and the keeper is in the open position, and to disengage from the second engagement feature in response to the keeper approaching the closed position, and wherein the second engagement feature is structured to retain the sleeve in the unlocking position when engaged with the first engagement feature.
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8. An electric strike, comprising:
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a housing; a keeper pivotally mounted in the housing, wherein the keeper is biased toward a closed position and is selectively pivotable to an open position; a locking assembly having a locking state in which the locking assembly retains keeper in the closed position and an unlocking state in which the keeper is pivotable toward the open position, wherein the locking assembly includes a rotatable sleeve having a locking position defining the locking state and an unlocking position defining the unlocking state; a motor drivingly connected with the locking assembly, wherein the motor is operable to rotate the sleeve between the locking position and the unlocking position; an anti-tamper mechanism having a first state in response to the open position of the keeper and a second state in response to the closed position of the keeper, wherein the anti-tamper mechanism is structured to retain the sleeve in the unlocking position when in the first state and to permit the sleeve to rotate to the locking position when in the second state, and wherein the anti-tamper mechanism includes a first engagement feature formed on the keeper and a second engagement feature formed on the sleeve; and a biasing member urging the sleeve toward the locking position. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. An electric strike, comprising:
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a housing; a keeper pivotally mounted in the housing, wherein the keeper is biased toward a closed position and is selectively pivotable to an open position; a locking assembly having a locking state in which the locking assembly retains keeper in the closed position and an unlocking state in which the keeper is pivotable toward the open position, wherein the locking assembly includes a rotatable sleeve having a locking position defining the locking state and an unlocking position defining the unlocking state; a transmission drivingly connected to the sleeve, the transmission having a lock-setting position and an unlock-setting position; and a motor operable to rotate the transmission between the lock-setting position and the unlock-setting position; wherein the transmission is drivingly connected to the sleeve through a lost motion connection; and wherein the lost motion connection is defined by first and second prongs of overlapping forked portions of the transmission and sleeve that are structured to rotate the sleeve from the locking position to the unlocking position in response to rotation of the transmission from the lock-setting position to the unlock-setting position and include gaps between the prongs to allow rotation of the transmission from the unlock-setting position to the lock-setting position with the sleeve retained in the unlocking position, and wherein the lost motion connection includes a spring that biases the sleeve toward the locking position. - View Dependent Claims (18, 19)
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Specification