Patent Application
20130167423
The present disclosure is generally related to trigger assemblies, and more particularly to trigger assemblies for use with small arms firearms, such as pistols and rifles.
Firearm firing mechanisms generally include a number of components that cooperate to hold a spring-loaded hammer or firing pin in a cocked position and then selectively release the hammer or firing pin, which applies force directly, or through an intermediate device, to an ammunition cartridge loaded within a chamber of the firearm. The components for holding a hammer or firing pin in a cocked position and then releasing the hammer or firing pin may be referred to as a trigger assembly.
Generally, the trigger assembly includes a trigger shoe that is accessible to the user to apply a pulling force. When the user pulls the trigger shoe with sufficient force to move the trigger shoe a pre-defined distance, the movement of the trigger shoe releases the spring-loaded hammer or firing pin to fire the ammunition cartridge.
In an embodiment, a trigger assembly includes a trigger shoe configured to disengage a sear to release a firing mechanism in response to a force applied by a user. The trigger assembly further includes a blocking mechanism configured to selectively prevent the release of the firing mechanism in response to a control signal.
In another embodiment, a trigger assembly includes a trigger shoe that is movable by a user to deliver a first force to a lever to disengage a sear to release a firing mechanism in response to pressure applied by a user. The trigger assembly further includes a blocking mechanism configured to selectively prevent the release of the firing mechanism in response to a control signal.
In still another embodiment, a system includes a trigger assembly and an electronic device. The trigger assembly includes a trigger shoe configured to disengage a sear to release a firing mechanism in response to force applied by a user, and includes a blocking mechanism configured to selectively prevent the release of the firing mechanism in response to a control signal. The electronic device is configured to selectively provide the control signal.
In the following discussion, the same reference numerals are used in the various illustrated examples to indicate the same or similar elements.
Embodiments of a trigger assembly system are described below that can be utilized with a small-arms firearm to improve accuracy and safety. In an example, the trigger assembly includes a trigger shoe (or trigger) to which a user may apply force to discharge a firearm and a blocking mechanism responsive to a control signal and configured to selectively prevent discharge of the firearm. The blocking mechanism can include an actuator or solenoid that is responsive to the control signal and configured to temporarily prevent discharge of the firearm until some predetermined condition is met.
Unlike a conventional electronic safety mechanism, the blocking mechanism is responsive to a control signal to change between operating modes, for example, from a blocking-enabled mode in which the blocking mechanism operates to prevent disengagement of the firing mechanism, to a conditionally-delayed mode in which the blocking mechanism operates to prevent disengagement of the firing mechanism until a condition is met. Further, the blocking mechanism can be disabled to permit a non-blocking or normal mode in which the trigger assembly disengages the firing mechanism in response to the user-applied force, like a trigger assembly without the blocking mechanism would.
In one instance, the blocking mechanism may be coupled to an electronic device, such as a digital scope, that includes image processing capabilities and that includes a controller configured to generate an electrical signal to selectively block discharge of the firearm until a user-configured digital mark (which can be assigned by the user to a target within a view area of the scope) aligns with the cross-hairs of a reticle of the digital scope or at least aligned to the reticle to a level that is below an error threshold. In another instance, the controller may detect an intervening object between the muzzle of the firearm and the target designated by the user-configured digital mark and may selectively block discharge of the firearm until the line of fire is clear. One possible example of a small-arms firearm that includes an embodiment of a trigger assembly system is described below with respect to
Digital scope 104 includes circuitry for displaying a view area including the target on a digital display within the scope, for superimposing a digital image of a reticle onto the view area of the digital display, and for allowing a user to apply a digital marker or tag onto the display to identify a target of interest within the view area. Digital scope 104 includes image processing circuitry configured to determine alignment of the digital marker to the reticle and to generate a control signal, which it communicates to trigger assembly 102, when the digital marker is aligned to the reticle to a level of accuracy that is within a pre-determined threshold.
Trigger assembly 102 includes a trigger shoe 116 to which the user can apply force to discharge the firearm 100. Trigger assembly 102 further includes a blocking mechanism (shown for example in
In a first mode, digital scope 104 may be configured to disable the controller. In this instance, the blocking mechanism within trigger assembly 102 is disabled. In this mode, application of force to the trigger shoe 116 can discharge the firearm 100. In a second mode, the controller within digital scope 104 operates to block discharge of the firearm 100 until a certain condition is met. The certain condition may include alignment of a user-defined target (digital marker) to a digital reticle of the scope. In another instance, the certain condition can be a time within a time range, a location within a range of location data, an image processing parameter indicating a clear line of sight to the target indicated by the digital marker, or some other condition.
Trigger assembly 102 includes trigger shoe 116 configured to apply a first force (a trigger force) to a firing mechanism 216 in response to a user-applied force. Trigger assembly 102 further includes a transceiver 210 configured to communicatively couple to electronic device 204. Transceiver 210 can be wired or wireless and configured for bi-directional communication with electronic device 204, such as to receive control signals and to send data. In an example, transceiver 210 may be omitted and the trigger assembly 102 may include a printed circuit board with an interface including pads or contacts for wired interconnection with a controller within electronic device 204. Transceiver 210 (or interface with contacts) includes an output coupled to an input of a blocking mechanism 212, which is configured to control a blocking lever 214 to apply a second force to firing mechanism 216 to prevent disengagement of the firing mechanism, thereby preventing discharge of a firearm, for example. In a particular example, blocking mechanism 212 includes an actuator configured to move blocking lever 214 (which is a movable element) into a blocking position to prevent movement of sear lever 216.
In an example, the blocking mechanism 212 may include a solenoid or other actuator responsive to the control signal from electronic device 204 (a source) to move blocking lever 214 to apply the second force. In an embodiment, the second force is greater than the first force. In a particular example, the first force is proportional to the force applied by the user to the trigger shoe and is limited to a level that is less than the second force so that the user cannot overpower the blocking mechanism 212.
While the above-example has identified one possible implementation involving a small arms firearm, other types of devices that utilize a trigger for activation may also employ a similar blocking mechanism. For example, an electrical paint dispenser trigger may include a blocking mechanism for synchronizing paint spray to a specific location, such that the blocking mechanism prevents discharge of the paint until the dispenser is aimed toward the specific location. In another example, a crossbow may include a trigger to release the bolt and a blocking mechanism 212 to delay or prevent release of the bolt. Other types of trigger-activated devices may also utilize the blocking mechanism to selectively prevent activation.
Electronic device 204 further includes a processor 304 coupled to transceiver 302. Processor 304 is coupled to an input interface 310 to receive user input, a display 306 for displaying text and/or images, to a range finder 324 for determining a distance from the electronic device 204 to a target, and a weather station 326 for determining cross-wind, humidity, and other environmental parameters that can affect the system. In a small arms firearm application, the environmental parameters of interest are any environmental parameters that can impact the trajectory of the bullet.
Electronic device 204 further includes a memory 308 that is coupled to processor 304. Memory 308 stores data and instructions that, when executed by processor 304, cause processor 304 to produce a digital view area with a digital reticle, to receive user inputs for configuring a digital marker on a target within the digital view area, to detect alignment of the digital marker to cross-hairs of the digital reticle, and to control blocking mechanism 212 within trigger assembly 102. Memory 308 stores digital image processing instructions 312 that, when executed, cause processor 304 to operate as an image processing device to process pixel data captured by a camera 328 coupled to processor 304. Memory 308 also stores reticle generation instructions 316 that, when executed, cause processor 304 to produce a digital representation of a reticle (calibrated to the small arms firearm) and to display the digital reticle within the digital view area.
Memory 308 further includes target marking instructions 318 that, when executed, cause processor 304 to receive user input to assign a digital marker onto an object within the digital view area. In a hunting application, the user may interact with input interface 310 (which may include one or more buttons) to apply a digital marker onto a target (such as a deer) that is within the digital view area. Digital image processing instructions 312 can isolate the portion of the digital view area that corresponds to the target having the digital marker so that the digital marker can move with the target as the target moves through the view area captured by camera 328. Memory 308 includes alignment detection instructions 320 that, when executed, causes processor 304 to determine a difference between cross-hairs of the digital reticle from the digital marker.
Memory 308 further includes controller instructions 314 that, when executed, cause processor 304 to control blocking mechanism 212 in
In operation, control signals from electronic device 204 are received by a transceiver on printed circuit board 402 or on a corresponding printed circuit board on the other side of trigger shoe 116. The control signals are provided to actuator 410 to control the blocking lever 214 to prevent discharge of the firearm. When the control signal causes actuator 410 to move the blocking lever 214 into a non-blocking position, force applied to trigger shoe 116 can cause disengagement of the firing mechanism, immediately (i.e., within a predictable amount of time, such as a lock time). In a particular implementation, the lock time can be approximately 5 ms. In an example, blocking mechanism 212 includes actuator 410 and blocking lever 214 and operates as a fire control system and not a safety. An example of the trigger assembly 102 with the side plate 404 removed showing the blocking lever is described below with respect to
Trigger assembly 102 further includes striker block 522 configured to pivot about an axis 524 and to engage lever 516. Trigger assembly 102 includes a lever returns spring 530 configured to return lever 516 to a firing position. Trigger assembly 102 also includes a lever 526 configured to pivot about an axis 528 and to couple to safety lever 408. When engaged, lever 526 contacts sear lever 516 to prevent release of striker block 522.
Trigger assembly 102 further includes lever 214 configured to pivot about axis 502 and to contact sear lever 508 when engaged by actuator 410. In an example, actuator 410 is responsive to control signals from electronic device 204 to selectively move lever 214 into or out of contact with sear lever 508 to selectively prevent or allow disengagement of the firing mechanism (e.g., movement of lever 516 to disengage striker block 522).
In operation, trigger shoe 116 is moveable in response to force applied by the user. Spring plunger 506 applies a force proportional to the force applied by the user up to a limit set by the spring force of spring plunger 506. Trigger stop 513 prevents the trigger shoe 116 from advancing far enough to physically contact sear lever 508, allowing spring plunger 506 to supply the force to disengage sear lever 508. By limiting the applied force to the spring force, a solenoid or other electrical component (such as actuator 410) can be configured to move blocking lever 214 into a position with sufficient force to prevent movement of the sear lever 508, even when the user applies significant force to trigger shoe 116. When the control signal is not present, force applied to trigger shoe 116 disengages the firing mechanism.
In general, the example of the blocking mechanism 212 (including actuator 410 and lever 214) represents one possible implementation of a mechanism to selectively delay or prevent disengagement of a firing mechanism, other configurations are also possible. Examples of other embodiments of the blocking mechanism and lever are described below with respect to
While the above-examples have described embodiments that utilize an actuator to position a blocking element, such as a blocking lever, to prevent disengagement of the firing mechanism in response to force applied by a user to trigger shoe 116, other blocking mechanisms may also be used. In an example where the trigger assembly is a fully electronic trigger that disengages the firing mechanism using electronic signals, the circuit may replace the actuator and lever with a switch that can be selectively opened to disengage the trigger from the firing mechanism and closed to couple the trigger to the firing mechanism. In this instance, the switch (or some other electronic circuit) can block or allow normal firing in response to a control signal.
In conjunction with the systems and trigger assemblies described above with respect to
Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention.
