Hydraulic power tool with user-actuated sequence valve

Abstract

A power tool includes a cylinder and a ram movably received in the cylinder to define a first chamber and a second chamber. A pump is used for supplying fluid to the first chamber and the second chamber. The sequence valve is operable between a first configuration that causes the pump to supply fluid to the first chamber to move the ram at a first speed and a second configuration that causes the pump to supply fluid to the second chamber to move the ram at a second speed. The user interface is manually actuatable by a user to move the sequence valve between a first configuration and a second configuration independent of pressure in the first chamber.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefits from U.S. Provisional Application No. 63 / 693358, filed September 11, 2024, which is incorporated herein by reference in its entirety. Background Technology

[0003] Crimping machines and cutters typically include a crimping head with opposing jaws that incorporate certain crimping and cutting features, depending on the specific construction of the tool. Some crimpers and cutters are hydraulically powered tools that include a piston that can apply force to the crimping or cutting head, the piston being used to close the jaws to perform crimping, compression, or cutting work at a target location. Valves may be used to direct hydraulic fluid, including high-pressure hydraulic fluid, into and out of the piston chamber. Summary of the Invention

[0004] A power tool may include a sequence valve to control the extension of a punch at different speeds. For example, the punch can move a first portion of its stroke at a first speed and can be switched to move a second portion of its stroke at a second speed. The sequence valve can be configured to switch the punch movement between the first and second speeds based on the pressure of a hydraulic fluid or by manual activation of the sequence valve by a user.

[0005] In some aspects, the power tool may include a cylinder and a pressure head movably housed within the cylinder to define a first chamber and a second chamber. A pump may supply fluid to the first and second chambers. A sequence valve may operate between a first configuration and a second configuration, wherein the first configuration causes the pump to supply fluid to the first chamber to move the pressure head at a first velocity, and the second configuration causes the pump to supply fluid to the second chamber to move the pressure head at a second velocity. The sequence valve may move from a first position to a second position based on the pressure in the first chamber. A user interface may be manually actuated by the user to move the sequence valve between the first and second configurations independently of the pressure in the first chamber.

[0006] In some examples, the sequence valve may include a lifting head that moves based on pressure in the first chamber or via actuation through a user interface.

[0007] In some examples, the power tool may also include a housing that houses the cylinder, and the lifting head may include a plunger that extends outside the housing for actuation by the user.

[0008] In some examples, the user interface can be configured as a lever, slider, button, or solenoid that applies external force to the lifting head.

[0009] In some examples, the user interface can be directly and mechanically connected to the lifting head.

[0010] In some examples, the user interface can be mechanically connected to the lifting head via a linkage device.

[0011] In some examples, the user interface can communicate with an electronic controller that activates the electronic actuator to move the lifting head.

[0012] In some examples, the sequence valve can acquire a second configuration when the pressure in the first chamber reaches a threshold pressure and is actuated independently of the user interface.

[0013] In some examples, the power tool may also include a working head that is coupled to the pressure head to perform at least one of crimping and cutting operations.

[0014] In some aspects, a power tool may include an actuator and a pump that supplies fluid to the actuator to extend or retract it. The pump may define an opening. A sequence valve may include a valve body positioned in the opening of the pump, a control element movable within the valve body between a first position and a second position, and a plunger extending from the valve body and configured to receive user input. User input may cause the control element to move between the first and second positions to change the speed of the actuator between a first speed and a second speed.

[0015] In some examples, user input can be provided at a user interface component that can be coupled to the plunger.

[0016] In some examples, the user interface component may include a mechanical linkage.

[0017] In some examples, the user interface component may include an electronic actuator.

[0018] In some examples, the control element can move from a first position to a second position based on the pressure of the fluid supplied to the first chamber, independent of user input.

[0019] In some examples, the control element may be a lifting head that can engage with a valve seat in the valve body in a first position and disengage from the valve seat in a second position.

[0020] In some examples, when the lifting head can be in the first position, fluid can be supplied only to the first chamber of the actuator, and when the lifting head can be in the second position, fluid can be supplied to both the first and second chambers of the actuator.

[0021] In some aspects, a method of operating a hydraulic power tool may include actuating a first user interface of the hydraulic power tool to supply fluid from a pump to a first fluid chamber to move a pressure head at a first speed. The method may include manually actuating a second user interface to move a lifting head of a sequence valve from a closed position to an open position, thereby supplying fluid from the pump to a second fluid chamber, thereby moving the pressure head at a second speed that may differ from the first speed. The second user interface may be actuated independently of the pressure in the first fluid chamber.

[0022] In some examples, manually actuating the second user interface may include actuating a mechanical linkage that directly engages the lifting head to move the lifting head from the closed position to the open position.

[0023] In some examples, the mechanical linkage may include one of a slide switch, lever switch, or button that mechanically displaces the lifting head against the biasing force of a spring.

[0024] In some examples, manually actuating the second user interface may include operating an electronic switch that causes an electronic actuator to move the lifting head from a closed position to an open position.

[0025] The features, functions and advantages described above may be implemented independently in various embodiments of this disclosure, or may be combined in other embodiments, wherein further details can be seen with reference to the following description and drawings. Attached Figure Description

[0026] The appended claims set forth novel features that are considered characteristics of the illustrative embodiments. However, the illustrative embodiments, preferred modes of use, further objects, and description thereof will be best understood by referring to the following detailed description of one or more illustrative embodiments of this disclosure when read in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 A perspective view of a hydraulic tool according to an exemplary embodiment is shown;

[0028] Figure 2 It shows Figure 1 A block diagram of the hydraulic tool shown;

[0029] Figure 3 It shows Figure 1 Another block diagram of the components of the hydraulic tool shown;

[0030] Figure 4 It shows Figure 1 A cross-sectional view of the hydraulic tool shown;

[0031] Figure 5 It shows Figure 1 The hydraulic tool shown is in Figure 4 An enlarged sectional view taken at region VV;

[0032] Figure 6 It shows Figure 1 An enlarged cross-sectional view of the sequence valve of a hydraulic tool in the closed position.

[0033] Figure 7 It shows Figure 6 An enlarged cross-sectional view of the sequence valve in the open position.

[0034] Figure 8 It shows Figure 1 An enlarged cross-sectional view of the sequence valve of a hydraulic tool in the closed position.

[0035] Figure 9 It shows Figure 8 An enlarged cross-sectional view of the sequence valve in the open position.

[0036] Figure 10 It shows Figure 1 An enlarged cross-sectional view of the sequence valve of a hydraulic tool in the closed position.

[0037] Figure 11 It shows Figure 10 An enlarged cross-sectional view of the sequence valve in the open position.

[0038] Figure 12 A flowchart illustrating an exemplary crimping method using hydraulic tools according to an exemplary embodiment is shown. Detailed Implementation

[0039] The following discussion is presented to enable those skilled in the art to make and use embodiments of the invention. Various modifications to the illustrated embodiments will be apparent to those skilled in the art, and the general principles herein can be applied to other embodiments and applications without departing from the embodiments of the invention. Therefore, embodiments of the invention are not intended to be limited to the illustrated embodiments, but are accorded the widest scope consistent with the principles and features disclosed herein. The following detailed description will be read with reference to the accompanying drawings, wherein the same elements in the different drawings have the same reference numerals. The drawings are not necessarily drawn to scale, depict selected embodiments, and are not intended to limit the scope of embodiments of the invention. Those skilled in the art will recognize that the examples provided herein have many useful alternatives and fall within the scope of embodiments of the invention.

[0040] Before explaining any embodiments of the invention in detail, it should be understood that the invention is not limited in its application to the details of the construction and arrangement of the components set forth in the following description or shown in the drawings. The invention can have other embodiments and can be practiced or performed in various ways. Moreover, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. For example, the terms “comprising,” “including,” or “having,” and variations thereof, as used herein, are intended to cover the items listed thereafter and their equivalents, as well as additional items.

[0041] As briefly described above, hydraulic tools can be used to perform cutting, crimping, or pressure processing on workpieces, such as pipes, cables, or connectors. Typically, hydraulic tools comprise a cylinder and piston assembly, where the piston is configured to extend and retract within the cylinder, thus moving jaws or any other means coupled to the piston to perform a task (crimping, cutting, punching, etc.). Hydraulic fluid can be introduced and discharged from the chambers of the hydraulic cylinder and piston assembly to cause the piston to extend and retract. Hydraulic fluid can typically displace the cylinder or piston to actuate the working head, thereby pressing, lifting, crimping, cutting, punching, or otherwise performing actions on a held workpiece.

[0042] Traditional hydraulic tools typically move the cylinder or piston toward the working head at a single speed until the working head contacts the workpiece held within it. In some applications, this single speed of the cylinder or piston may be undesirable, and the working head may be actuated too quickly to cut or crimp the workpiece, making it excessively difficult for the operator attempting to correctly align the working head with the desired crimping, cutting, or punching position on the workpiece. Furthermore, hydraulic pressing or lifting tools may suffer from a lack of speed control and operational precision. Therefore, a hydraulic tool is often needed that can selectively adjust the piston speed, thereby adjusting the speed of the actuated working head, to alleviate the task of aligning the working head with respect to the desired lifting, pressing, crimping, cutting, or punching position.

[0043] Typically, embodiments of the present invention provide a hydraulic tool including a pump, a piston, and a working head. The pump can supply fluid to one or more of a plurality of hydraulic fluid chambers to extend the piston and thus actuate the working head. The pump can supply fluid to a first chamber of the hydraulic fluid chambers. Supplying fluid to the first chamber causes the piston to extend at a first rate. In some examples, the pump can additionally supply fluid to a second chamber of the hydraulic fluid chambers. Simultaneously supplying fluid to both the first and second chambers causes the piston to extend at a second rate slower than the first rate, thereby regulating the speed of the piston and thus regulating the actuation speed of the working head.

[0044] Some embodiments of the present invention provide a sequence valve. More specifically, some embodiments of the present invention provide a sequence valve that can be selectively actuated by a user to control the speed of a piston in a hydraulic tool. This gives the user additional control over tool operation compared to conventional designs where the sequence valve is inside the tool and operable solely based on pressure in the cylinder. According to aspects of this disclosure, the sequence valve can be actuated by a user to selectively allow fluid communication between the pump and a second chamber of the hydraulic fluid chamber. Thus, actuation of the sequence valve can slow down the piston extension rate and the actuation rate of the working head. This “on-demand” actuation of the sequence valve can be controlled by the user via an actuating element of the sequence valve. The actuating element can be a manual actuating element, such as a button, lever, toggle switch, slider, etc., or an electronic actuating element, such as an electric switch or other control interface that can be connected to, for example, a solenoid, linear actuator, etc.

[0045] Embodiments of the sequence valve described herein include a valve assembly with a lifting head. The lifting head can regulate fluid communication between the pump and the second chamber of a hydraulic tool. In use, the lifting head can be spring-biased towards the closed position. The lifting head can be automatically actuated to the open position by fluid pressure (e.g., from the pump) against the force of the spring. The lifting head can also be selectively actuated to the open position by a user via a button, switch, slider, or other user interface.

[0046] Figure 1 A hydraulic tool 100 (i.e., a power tool) according to an exemplary embodiment is shown. Although the exemplary embodiments described herein refer to crimping tools, it should be understood that the features of this disclosure can be implemented in other similar tools, such as cutting tools or stamping tools. Furthermore, any suitable size, shape, or type of element or material can be used. By way of example only, the hydraulic tool 100 shown includes a body 102 (e.g., a cylinder, motor, reservoir, electronics, etc.) and a working head 106. The body 102 may be housed within a housing 104, and the working head 106 may extend from the housing 104 to engage a workpiece. In the example shown, the working head 106 is a hexagonal or hexagonal crimping head. However, alternative styles of working heads can also be used for crimping, cutting, or stamping, including blades, jaws, crimping dies, etc.

[0047] Figure 2 and 3 It shows Figure 1 , 4 A block diagram of the components of the hydraulic tool 100 shown in Figure 5. Figure 2 As shown, the hydraulic tool 100 includes an electric motor 108 configured to drive a pump 112. The pump 112 is configured to supply pressurized hydraulic fluid to one or more hydraulic fluid chambers of a hydraulic actuator cylinder 116, which includes a piston 120 slidably housed therein (e.g., ...). Figure 4(As shown). For example, the hydraulic circuit 124 of the hydraulic tool 100 can connect the fluid reservoir 128 to the pump 112, such that the pump 112 can supply fluid to the first fluid chamber 132 and / or the second fluid chamber 136. As further described below, selectively supplying fluid to the first fluid chamber 132 and / or the second fluid chamber 136 can adjust the actuation speed of the piston 120 within the hydraulic actuator cylinder 116.

[0048] In some examples, some functions of the hydraulic tool can be controlled by a computing device. For example, the hydraulic tool may include a controller 140. The controller 140 may include a processor, a memory 144, and a communication interface. The memory 144 may include instructions that, when executed by the processor, cause the controller 140 to operate the hydraulic tool 100. In one configuration, the controller communication interface enables the controller 140 to communicate with various components of the hydraulic tool 100, such as user interface components, motor 108, memory 144, power supply 148, one or more sensors 152, and various components of the hydraulic circuit 124 (see, for example, [link to relevant documentation]). Figure 3 The power source 148 may be a battery, which may be detachably connected to a part of the hydraulic tool, such as the battery container 150 of the housing 104 of the hydraulic tool. The battery may be a rechargeable lithium-ion battery pack, a nickel-metal hydride battery, or other suitable power source capable of providing sufficient voltage and current to operate the motor 108 and the controller 140. The battery container 150 may include electrical contacts, locking mechanisms, and safety features to ensure a secure connection and prevent accidental disconnection during operation.

[0049] like Figure 2 As shown, the hydraulic tool 100 may include multiple user interface components that allow a user to input information into the hydraulic tool 100. As described below, the user interface components can be used to operate the functions of the hydraulic tool 100. Specifically, a first user interface component 156, shown here as a trigger 157, may be actuated to activate the motor 108 and thus drive the piston 120. In some examples, the first user interface component 156 may be linked to a controller 140. For example, the trigger 157 may engage a switch coupled to the controller 140. In such an example, actuating the trigger 157 may cause the controller 140 to receive a signal indicating user activation, and in response, the controller 140 may send a control signal to actuate the motor 108, thereby initiating the operation of the pump 112 to supply pressurized hydraulic fluid to the hydraulic actuator cylinder 116 for extending the piston 120 and actuating the working head 106. In some cases, the first user interface component 156 may include other types of controls for the user, including, for example, an operator panel, one or more switches, one or more buttons, one or more interactive indicator lights, a soft touchscreen or panel, a joystick, a slider, and other similar types of switches such as a trigger switch.

[0050] Still refer to Figure 2 The hydraulic tool 100 may also include a second user interface component 160. In some examples, the second user interface component 160 can adjust the actuation speed of the piston 120, such as... Figure 4 As shown, specifically, the second user interface component 160 can be actuated to selectively open and close the sequence valve 164 positioned between the pump 112 and the second fluid chamber 136. As will be further described below, opening the sequence valve 164 can regulate the hydraulic actuator cylinder 116 (… Figure 1 (The speed is shown in the image).

[0051] In some examples, the second user interface component 160 can provide direct manual control of the sequence valve 164, allowing the user to manually switch the hydraulic tool 100 from operating at a first speed to a second speed, replacing pressure-based automatic operation. When the sequence valve 164 is in the closed position, the pump 112 primarily supplies fluid to the first fluid chamber 132, causing the piston 120 to extend at the first speed. By actuating the second user interface component 160, the user can manually open the sequence valve 164, which allows fluid communication between the pump 112 and the second fluid chamber 136.

[0052] The manual actuation of the second user interface component 160 allows the user to switch to a second speed at any desired point during the piston stroke, instead of waiting for the fluid pressure to reach a predetermined threshold that will automatically open the sequence valve 164. This user-controlled switching capability provides enhanced operational flexibility, allowing the operator to slow down the piston movement as they approach the workpiece or when precise positioning is required, regardless of the current pressure conditions in the hydraulic system.

[0053] In some cases, the second user interface component 160 can be configured for momentary control, wherein the sequence valve 164 remains open only when the user actively engages the interface component. Alternatively, the second user interface component 160 can be configured for interlocking control, which holds the sequence valve 164 in the open position until the user releases or deactivates the interface component. The manual control provided by the second user interface component 160 allows the operator to adapt the tool's speed characteristics to specific work requirements or personal preferences during operation.

[0054] In some cases, the sequence valve 164 can open based on manual activation by the user or when the pressure of the hydraulic fluid exceeds a predetermined pressure. For example, when the hydraulic fluid pressure in the first chamber reaches a predetermined pressure threshold, the fluid pressure acts on the lifting head of the sequence valve, applying a force that overcomes the bias force of the spring, thereby automatically moving the lifting head from the closed position to the open position and allowing fluid communication between the pump and the second chamber.

[0055] like Figure 2As shown, in some examples, the second user interface component 160 may be physically connected directly or otherwise to the sequence valve 164. For example, as further described below, the second user interface component 160 may be a switch, lever, slider, or trigger that manually acts on the lifting head of the sequence valve 164 to move the sequence valve 164 to the open position. A direct physical connection between the second user interface component 160 and the sequence valve 164, or an indirect connection via a linkage or other mechanical system, provides immediate actuation without requiring an electronic control system or intermediate actuator. This mechanical connection ensures reliable operation even in harsh working environments where electronic components may be susceptible to damage from vibration, moisture, or electromagnetic interference. The physical connection can be achieved through various mechanical means, such as direct or indirect push-pull mechanisms where the second user interface component 160 directly contacts and moves the lifting head, or through a linkage system that converts user input motion into the desired valve actuation motion. In some embodiments, the physical connection may include mechanically advantageous features, such as a lever ratio or cam profile, that reduce the force required for the user to actuate the sequence valve while maintaining precise control over valve operation. Direct mechanical connection also provides tactile feedback to the user, allowing the operator to feel the valve’s response and confirm successful actuation through the physical resistance and motion characteristics of the connected components.

[0056] Brief Reference Figure 3 In some examples, the second user interface component 160 can be linked to the controller 140 via an electronic communication path. For example, as further described below, the second user interface component 160 can be a switch, lever, slider, or trigger that, when actuated, causes the controller 140 to actuate the sequence valve 164 to the open position. For example, the controller 140 can receive an electrical signal indicating user activation. In response to receiving this signal, the controller 140 can process the input and generate appropriate control commands to actuate the sequence valve 164 to the open position via a solenoid, linear actuator, motor, or some other type of electronically controlled actuator. This electronic control device allows for precise timing and control of the sequence valve operation and can include additional features such as programmable delay settings, variable actuation speed, or integration with other tool functions. The controller 140 can also monitor the status of the sequence valve 164 and provide feedback to the user via visual indicators, audible signals, or tactile feedback mechanisms. Furthermore, the electronic connection between the second user interface component 160 and the controller 140 enables safety interlocking, operating modes, and can improve the performance of the hydraulic tool 100.

[0057] Figure 4An exemplary embodiment of a hydraulic circuit according to aspects of the present invention is provided. In this illustrated hydraulic tool example, the frame and bore of the hydraulic tool 100 form a hydraulic actuator cylinder 116. The piston 120 of the hydraulic actuator cylinder 116 has a first piston end 168 and a second piston end 172 opposite to the first piston end 168. At the first piston end 168, the piston 120 is coupled to a linkage mechanism 176 configured to actuate a working head 106. Specifically, the piston 120 is configured to drive a movable working head 180 toward the fixed working head 106 to perform a task (e.g., cutting, crimping, punching, or other work) on a workpiece held within the working head 106. When the piston 120 of the hydraulic actuator cylinder 116 retracts, the movable head 180 can be pulled back as... Figure 1 and Figure 4 The fully retracted position or the original position is shown. Optionally, the movable head 180 can be pulled back to the partially retracted position.

[0058] When pressurized fluid is supplied to the hydraulic actuator cylinder 116 via pump 112, the fluid acts on the piston 120 within the hydraulic actuator cylinder 116, causing the piston 120 to extend toward the workpiece within the working area of ​​the working head 106. Specifically, pressurized fluid is supplied to a first fluid chamber 132 or a second fluid chamber 136 of the hydraulic actuator cylinder 116, and the fluid within one or more of the chambers 132, 136 can provide a force configured to extend the piston 120. As the piston 120 extends, the linkage mechanism 176 moves the movable working head 180 toward the fixed head 184, and thus allows the working heads 180, 184 to act on the workpiece already placed between the working heads 180, 184. When the crimping, cutting, or punching operation is completed, the controller 140 can provide a command to the hydraulic circuit 124 to stop the motor 108, thereby releasing the high-pressure fluid back to the fluid reservoir 128, as described in more detail herein.

[0059] As described above, to improve the performance of the hydraulic tool 100, for example by increasing the piston speed to reduce cycle time, it may be desirable to have a tool in which the piston 120 can move at non-constant or different speeds and apply different loads based on the tool's state, the crimping operation, and / or the desired type of crimping. For example, it may be advantageous to move the piston at a first speed (e.g., rapidly) before contacting the workpiece, as this reduces the piston's travel time before crimping occurs. This rapid approach speed allows the operator to position the tool quickly and efficiently, thereby reducing total cycle time and improving productivity. Once the working head contacts the workpiece, it is advantageous to slow down the speed and increase the force output to perform the crimping, which allows for more precise crimping. Slower, high-force operation provides better control over the crimping process, ensuring proper compression and connection integrity. This dual-speed operation is particularly beneficial when working with different materials or connector types that may require different levels of precision and force. The variable speed capability also allows the tool to adapt to different workpiece geometries and material properties, thereby optimizing the crimping process for each specific application.

[0060] Still refer to Figure 4 As described above, piston 120 is movably housed within hydraulic actuator cylinder 116. Piston 120 includes a piston head 188 and a piston rod 192 extending from piston head 188 along the central axis of hydraulic actuator cylinder 116. As shown, piston 120 is partially hollow. Specifically, piston head 188 and piston rod 192 are at least partially hollow to form a cavity 196 within piston 120. Cavity 196 extends from second piston end 172 toward first piston end 168.

[0061] In some examples, motor 108 may drive pump 112 to provide pressurized fluid to extension cylinder 204 via check valve 200. Extension cylinder 204 is disposed in a cylindrical cavity 196 formed within a partially hollow piston 120. Specifically, extension cylinder 204 extends from the end of hydraulic actuator cylinder 116 opposite to the worktable 106 and passes through the second piston end 172. Piston 120 may be configured to slide axially about the outer surface of extension cylinder 204. However, extension cylinder 204 may be fixed to hydraulic actuator cylinder 116 such that extension cylinder 204 does not move with piston 120.

[0062] In some examples, the piston 120, and in particular the piston rod 192, may further include or otherwise connect to the pressure head 208. For example... Figure 4 As shown, the pressure head 208 can be connected to the movable working head 180 via a linkage mechanism 176. Therefore, the movement of the piston 120 can drive the pressure head 208 to actuate the movable working head 180.

[0063] The piston 120 and the extension cylinder 204 together divide the interior of the hydraulic actuator cylinder 116 into two chambers: a first fluid chamber 132 and a second fluid chamber 136. The first fluid chamber 132 is formed within the combination of the cylindrical cavity 196 of the hollow piston 120 and the extension cylinder 204. The second fluid chamber 136 is formed between the surface of the piston head 188 facing the motor 108 and pump 112 (e.g., away from the working head 106), the outer surface of the extension cylinder 204, and the wall of the hydraulic actuator cylinder 116. The respective volumes of the first fluid chamber 132 and the second fluid chamber 136 can vary as the piston 120 moves linearly within the hydraulic actuator cylinder 116.

[0064] Pump 112 is configured to draw fluid from fluid reservoir 128 to pressurize the fluid and deliver it to extension cylinder 204 after a user initiates a working command. The working command can be transmitted via a user interface component (...). Figure 2 The crimping command can be initiated by entering a command on the interface (as shown). For example, the crimping command can be initiated by the user entering a crimping command via the first user interface component 156.

[0065] Fluid reservoir 128 may include fluid at pressures close to atmospheric pressure (e.g., 15-20 pounds per square inch (psi)). Initially, pump 112 supplies low-pressure fluid to the first fluid chamber 132 of extension cylinder 204. Specifically, fluid may flow through check valve 200 to reach the first fluid chamber. However, fluid flow into the second fluid chamber 136 can be prevented by high-pressure check valve 206 and sequence valve 164.

[0066] The fluid delivered to the first fluid chamber 132 can exert pressure on a first area A1 within the piston 120. As shown, the first area A1 can be defined within a cylindrical cavity 196 (e.g., its end) adjacent to the first piston end 168. The fluid causes the piston 120 and the pressure head 208 connected thereto to advance rapidly. Specifically, when the pump 112 delivers fluid at a flow rate Q to the first fluid chamber 132, the piston 120 and the pressure head 208 can move at a speed equal to V1, where V1 can be calculated using the following equation:

[0067] (1)

[0068] Furthermore, if the fluid pressure is P1, the force F1 applied to piston 120 can be calculated using the following equation:

[0069] (2)F1=P1A1

[0070] Furthermore, as the piston 120 extends within the hydraulic actuator cylinder 116, hydraulic fluid is drawn or sucked from the fluid reservoir 128 into the second fluid chamber 136 via the bypass check valve 210. As the piston 120 begins to extend, the pressure in the second fluid chamber 136 decreases below the pressure of the fluid in the fluid reservoir 128, and thus the fluid in the fluid reservoir 128 flows into the second fluid chamber 136 through the bypass check valve 210 to fill the second fluid chamber 136.

[0071] As piston 120 and pressure head 208 extend, movable working head 180 and fixed working head 184 move toward each other to prepare for crimping, cutting, or punching a workpiece placed between them. When movable head 180 reaches the workpiece, the workpiece may impede the movement of movable head 180 toward fixed head 184. The increased resistance to the movement of movable head 180, and therefore the increased resistance to piston 120, can cause an increase in pressure of the hydraulic fluid supplied by pump 112. As further described below, the increased pressure supplied by pump 112 can open sequence valve 164 to increase the force exerted by movable head 180 on the workpiece.

[0072] As described above, the hydraulic tool 100 includes a sequence valve 164 configured to selectively supply fluid from the pump 112 to the second fluid chamber 136 to change the speed and force at which the movable working head 180 advances toward the workpiece.

[0073] Sequence valve 164 includes a lifting head 212 configured to open and close an inlet port 216 of sequence valve 164. Sequence valve 164 may include a spring 220 (or other biasing member) configured to bias the lifting head 212 to a closed position (e.g., to engage a valve seat 217 defined by the body 218 of sequence valve 164) to prevent flow through inlet port 216 and thus through sequence valve 164. Additionally, sequence valve 164 may include an outlet port 224 configured to connect sequence valve 164 to a second fluid chamber 136. Thus, moving the lifting head 212 against the bias of spring 220 causes sequence valve 164 to move to an open position, allowing fluid supplied by pump 112 to enter inlet port 216 and flow into the second fluid chamber 136 via outlet port 224. The lifting head 212 can move to the open position when pressure acting on an end region of the lifting head (e.g., flange 219) overcomes the bias of spring 220. When the force acting to keep the lifting head 212 open is reduced or removed, the lifting head returns to the closed position. Specifically, when the hydraulic pressure in the first fluid chamber 132 decreases below the threshold pressure required to overcome the bias of the spring 220, the spring 220 automatically pushes the lifting head 212 back into engagement with the valve seat 217, thereby closing the sequence valve 164. Similarly, when the user interface component 160 is released or deactivated by the user, any applied external force used to manually hold the lifting head 212 in the open position is removed, allowing the spring 220 to return the lifting head 212 to the closed position. This return to the closed position occurs regardless of whether the lifting head 212 was initially opened hydraulically or manually, because the spring 220 provides a consistent restoring force that ensures the sequence valve 164 defaults to the closed state when the opening force is no longer present.

[0074] During operation, the sequence valve 164 can be configured to open automatically to change the speed and force with which the movable working head 180 advances toward the workpiece. For example, fluid supplied to the first fluid chamber 132 by the pump 112 can be configured to act on the lifting head 212. Specifically, once the fluid supplied to the first fluid chamber 132 by the pump 112 reaches a predetermined lifting pressure, the fluid can exert a force on the lifting head 212 exceeding the force exerted on the lifting head 212 by the spring 220. The predetermined lifting pressure threshold is calibrated based on specific application requirements and tool configuration, typically ranging from several hundred to several thousand pounds per square inch depending on the tool size and the intended workpiece material. Hydraulic pressure acts on a specific surface area of ​​the lifting head 212, generating a force that overcomes spring preload and any additional resistance within the valve assembly. As the pressure in the first fluid chamber 132 increases, the pressure differential across the lifting head 212 increases proportionally until an opening threshold is reached. Therefore, the lifting head 212 moves to the open position, allowing fluid to enter the second fluid chamber 136. Once opened, sequence valve 164 creates a fluid communication path capable of pressurizing both chambers simultaneously. The example of sequence valve 164 shown is an exemplary configuration for illustrative purposes, and other sequence valve designs can be implemented, including pilot-operated valves, cartridge valves, or electronically controlled proportional valves that provide different response characteristics and pressure settings. Accordingly, the principles described herein can be applied to other sequence valve types or systems, for example, including user-actuable flow control elements (e.g., lift head 212) to allow the user to manually actuate the sequence valve.

[0075] When the sequence valve 164 is open, fluid is allowed to act on the area A2 (e.g., region A2) of the piston head 188 in addition to area (region) A1. Therefore, fluid can act on the larger cross-section (A1+A2) of the piston 120. As described above, the pump 112 can supply a relatively uniform fluid flow. Thus, using the same flow rate Q used in equation (1), it can be determined that the piston 120 and the pressure head 208 can move at a velocity equal to V2, where V2 can be calculated using the following equation:

[0076] (3)

[0077] As shown in equation (3), since the area increases from A1 to (A1+A2), V2 is less than V1. Thus, the piston 120 and the pressure head 208 can be slowed to a controlled speed, enabling controlled and more precise operation. Furthermore, as the area of ​​fluid action increases from A1 to (A1+A2), the force applied to the piston 120 also increases, and can be calculated using the following equation:

[0078] (4) F2 = P2(A1 + A2)

[0079] F2 is greater than F1 because the area increases from A1 to (A1+A2). Therefore, when the sequence valve 164 opens, high-pressure hydraulic fluid can enter both the first fluid chamber 132 and the second fluid chamber 136, causing the piston 120 to translate, and thus the pressure head 208 to translate, increasing the force applied to the workpiece by the pressure head 208. Simultaneously, the flow rate of fluid from the pump 112 can remain constant, but a larger volume is filled per unit extension of the piston 120. Therefore, the piston 120 increases the force output and decreases the extension speed.

[0080] In some examples, when a higher-pressure fluid fills the second fluid chamber 136 due to the opening of the sequence valve 164, the bypass check valve 210 can be closed to prevent fluid from flowing from the second fluid chamber 136 back to the fluid reservoir 128.

[0081] Once the workpiece is crimped, cut, or punched, and the piston 120 reaches the end of its stroke within the hydraulic actuator cylinder 116, the hydraulic pressure of the fluid increases because the motor 108 can continue to drive the pump 112. This pressure increase occurs because the piston 120 can no longer advance further, while the pump 112 continues to supply fluid to the hydraulic actuator cylinder 116. The hydraulic pressure can continue to increase until it reaches a threshold pressure value, which serves as an indication that the operation has been completed and the tool has reached its maximum extension. This threshold pressure value can be predetermined based on the specific tool configuration, the type of work being performed, and safety considerations to prevent overpressure of the hydraulic system. In some examples, the hydraulic pressure within the hydraulic actuator cylinder 116 can be monitored by a sensor 152 (e.g., ...). Figure 2 and 3 (As shown) The sensor can be a pressure transducer, pressure switch, or other suitable pressure sensing device capable of detecting when the system pressure reaches a predetermined threshold. Sensor 152 provides real-time feedback to controller 140, enabling precise control of the tool's operating cycle. Once controller 140 receives feedback from sensor 152 (as shown), the sensor can monitor the system pressure. Figure 2 and 3 Upon receiving information indicating that the pressure has reached a threshold pressure value, controller 140 can shut off motor 108 and activate release valve 230 to allow pressurized fluid to return to fluid reservoir 128, thereby reducing system pressure and allowing return spring 228 to retract piston 120 and pressure head 208 to the desired position, such as the original or fully retracted position (e.g., as shown). Figure 4 (As shown). This automatic retraction sequence ensures consistent tool operation and prepares the tool for the next work cycle, while preventing damage due to excessive pressure buildup.

[0082] In some examples, the hydraulic tool 100 includes a return spring 228 disposed in a first fluid chamber 132, configured to return the piston 120 to a retracted position. The return spring 228 is attached to a hydraulic actuator cylinder 116 and acts on the surface of the piston 120 to bias the piston 120 in a direction away from the working head 106. The return spring 228 provides a restoring force that ensures reliable retraction of the piston 120 after the working operation is completed, regardless of the orientation of the hydraulic tool 100 during use. The spring force is calibrated to overcome frictional forces within the hydraulic system while allowing the hydraulic pressure to easily overcome the spring bias during extension operations. During the retraction of the piston 120, the pressure of the fluid in the first fluid chamber 132 and the second fluid chamber 136 may be higher than the pressure in the fluid reservoir 128. This pressure difference occurs because, during the working operation, the hydraulic fluid in the chambers has been pressurized by the pump 112, while the fluid reservoir 128 maintains a relatively low pressure, typically close to atmospheric pressure. As a result, hydraulic fluid can be discharged from the first fluid chamber 132 back to the fluid reservoir 128 via the release valve 230. The release valve 230 is configured to open when activated by the controller 140, thereby creating a flow path that allows pressurized fluid to return to the fluid reservoir 128, and thus reducing the system pressure. Simultaneously, hydraulic fluid can be discharged from the second fluid chamber 136 back to the fluid reservoir 128 via the high-pressure check valve 200 and the release valve 230. This dual-path fluid return system ensures that both chambers are properly depressurized during the retraction cycle, thereby allowing the return spring 228 to effectively move the piston 120 back to its original position.

[0083] As described above, in some examples, the second user interface component 160 may allow the user to selectively open the sequence valve 164. Specifically, the second user interface component 160 may be used to selectively actuate the lifting head 212 to the open position and allow fluid communication between the pump 112 and the second fluid chamber 136. Also as described above, opening the sequence valve 164 to allow fluid communication to the first fluid chamber 132 and the second fluid chamber results in a reduction in the speed of the piston 120. In some examples, the second user interface component 160 may be actuated to reduce the speed of the piston 120 before the working head 106 contacts the workpiece. Reducing the speed of the piston 120 slows the translation of the movable working head 180 relative to the fixed working head 184, thereby allowing the user to properly align the working head at the desired crimping, cutting, or punching position on the workpiece. The reduced speed may also be accompanied by a greater force output to perform crimping or cutting operations or another working function. This user-controlled speed regulation provides operational advantages over conventional hydraulic tools that operate at a single fixed speed throughout the entire stroke cycle. The ability to manually trigger deceleration allows the operator to maintain a rapid approach speed while positioning the tool, minimizing cycle time and increasing overall productivity. Once the working head approaches the target position on the workpiece, the operator can immediately switch to a slower, more controlled speed using the second user interface component 160, without waiting for automatic pressure-based initiation. This manual control is particularly beneficial when working with precision materials, precision connectors, or in applications where precise positioning is critical to the quality of the finished connection. Enhanced control also reduces the likelihood of operator error, as the slower speed provides more time for fine-tuning and ensures that crimping, cutting, or punching operations occur at the precise, intended location. Furthermore, the increased force output accompanying the reduced speed ensures that the tool can perform operations effectively even on challenging materials or in applications requiring higher compressive forces. The combination of user-selectable timing and dual-speed operation makes the tool suitable for a wide range of applications and operator preferences, enhancing the versatility and usability of hydraulic power tools in various working environments.

[0084] As described above, various types of manual actuation systems can be implemented to provide user control of the sequence valve 164, including mechanical linkages, direct actuation mechanisms, and electronic control interfaces, which allow the operator to selectively forgo automatic pressure-based operation of the sequence valve. (See reference...) Figure 5 In some examples, the sequence valve 164 may include a plunger 232 directly connected to the lifting head 212. The plunger 232 may extend out of the valve body 218 for manual engagement by a user to open the sequence valve 164.

[0085] In such an example, mechanically manipulating the plunger 232 can move the lifting head 212 within the sequence valve 164, allowing the user to open the sequence valve 164 and thus reduce the actuation speed of the hydraulic tool 100. Specifically, the lifting head 212 can be configured to move along the longitudinal axis of the sequence valve 164 in a first direction, for example by linearly translating away from the valve seat 217 to create a fluid flow path between the inlet port 216 and the outlet port 224. The linear movement of the lifting head 212 along the axis can be achieved by direct axial displacement of the plunger 232, which overcomes the biasing force of the spring 220 to mechanically lift or pull the lifting head 212 from its seated position. In an alternative embodiment, the lifting head 212 can be configured for rotational movement, wherein the lifting head 212 rotates about a longitudinal or transverse axis to align a flow passage or move a sealing surface out of engagement with the valve seat 217. This rotational motion can be achieved via a threaded connection between the plunger 232 and the lifting head 212, or via a cam actuation mechanism that converts linear input motion from the user interface into rotational motion of the lifting head 212. Alternatively, the lifting head 212 can be designed for combined translational and rotational motions, where an initial rotation positions the lifting head 212 for optimal flow characteristics, followed by axial translation to fully open the valve passage.

[0086] like Figure 5As shown, plunger 232 extends from lifting head 212, allowing a user to pull or otherwise mechanically manipulate plunger 232 to translate lifting head 212 within sequence valve 164. Specifically, sequence valve 164 can be opened by applying external force to translate or otherwise move plunger 232 to disengage lifting head 212 from engagement with valve seat 217. The external force required to actuate plunger 232 can be calibrated to provide appropriate tactile feedback to the user while ensuring reliable operation under various working conditions. Force thresholds can be set to prevent accidental actuation while remaining easily operable by the user during normal tooling operation. Plunger 232 may include ergonomic features such as textured surfaces, finger grips, or contour shapes to facilitate user manipulation and provide a secure engagement even when the user is wearing work gloves or operating in complex environmental conditions. Once plunger 232 is no longer mechanically actuated (e.g., external force is removed), sequence valve spring 220 can close sequence valve 164 again, thereby increasing the actuation speed of hydraulic tool 100. Spring 220 provides a consistent restoring force that ensures sequence valve 164 returns to its default closed position, thus maintaining system reliability and preventing accidental operation. However, in some examples, as described above, sequence valve 164 can be closed only when the fluid pressure acting on lifting head 212 (e.g., the bias against spring 220) is less than a predetermined lifting head pressure. This dual-mode operation allows sequence valve 164 to remain open via manual user actuation or automatic pressure-based actuation, providing flexibility in tool operation and ensuring the valve remains open when high-pressure conditions require continuous dual-chamber operation. When the second user interface component 160 is in a disengaged position (e.g., the first position when not activated by the user), the lifting head 212 can move independently of the second user interface component 160, and remains in the open position when the second user interface component 160 is in an engaged position (e.g., the second position when activated by the user). This independent operating capability ensures that the sequence valve 164 maintains its automatic pressure-based function even when the operator does not actively use the manual override feature. The disengaged position of the second user interface component 160 allows the lifting head 212 to respond freely to hydraulic changes within the system, thereby enabling seamless switching between manual and automatic operating modes. However, it should be understood that in other examples, the sequence valve 164 may be configured such that the sequence valve 164 opens only by manual activation, and does not open automatically based on hydraulic pressure (e.g., by adjusting the bias pressure on the lifting head 212 or by using another type of sequence valve 164, such as a rotary valve).

[0087] When the second user interface component 160 is in the engaged position, it mechanically holds the lifting head 212 in the open position, overcoming any spring bias and maintaining dual-chamber operation regardless of system pressure conditions. In some examples, the second user interface component 160 may be biased to the disengaged position. This biasing configuration may be configured to automatically return the second user interface component 160 to its neutral or disengaged state when not actively handled by the user (e.g., via the second user interface component 160).

[0088] In some examples, the hydraulic tool 100 may include a locking mechanism 294 that can selectively hold the second user interface component 160 in an engaged position, thereby holding the sequence valve 164 in an open position without requiring continuous user activation.

[0089] In applications requiring extended dual-chamber operation, locking mechanism 294 provides operational convenience, allowing the operator to work freely with both hands while maintaining a slower, higher-force operating mode during multiple work cycles. Alternatively, locking mechanism 294 can be configured to prevent actuation of sequence valve 164, thereby holding sequence valve 164 in the closed position to ensure high-speed operation of pressure head 208. In this configuration, locking mechanism 294 can physically block or disable the second user interface component 160, thereby preventing unintentional switching to a slower dual-chamber mode during operations that preferably involve fast or low-force movements, such as during initial positioning or when working with materials that do not require high-force output.

[0090] Various types of locking mechanisms can be implemented depending on the specific configuration of the second user interface component 160. In some cases, a mechanical latch can be incorporated into the second user interface component 160, wherein when the second user interface component 160 is moved to the engaged position, the latch engages with a corresponding feature on the tool housing 104 or valve assembly. The mechanical latch may include a spring-loaded pawl, a cam-operated lock, or a friction-based retaining system that securely holds the second user interface component 160 in place until intentionally released by the operator.

[0091] In other examples, such as in Figure 9In this configuration, the locking mechanism 294 may include a toggle arrangement in which the second user interface component 160 alternates between locked and unlocked states using continuous actuation. The locking mechanism 294 can move between a locked position and an unlocked position to control the operation of the second user interface component 160. In the locked position, the locking mechanism 294 may physically engage with either the second user interface component 160 or the sequence valve 164 to hold the sequence valve 164 in an open or closed position, thereby preventing unintentional changes to the valve state during operation. When the locking mechanism 294 moves to the unlocked position, the second user interface component 160 can operate normally and freely, allowing the user to actuate the sequence valve 164 between the open and closed positions as needed. The locking mechanism 294 may include a spring-loaded pawl, cam mechanism, or sliding collar that reliably engages in both the locked and unlocked positions, providing tactile feedback to the user to confirm the current state of the locking mechanism 294. This switching mechanism may optionally include an internal ratchet component or a bistable spring system that holds the second user interface component 160 in the engaged or disengaged position until the next user input. In other cases, the locking mechanism may include a sliding collar or rotating ring positioned adjacent to the second user interface component 160. The sliding collar or rotating ring may be moved to a locked position that physically prevents the second user interface component 160 from returning to the disengaged position, or it may engage with internal components to hold the sequence valve 164 in the open position. These mechanisms may include visual indicators, tactile feedback, or audible clicks to confirm proper engagement of the locking feature.

[0092] In an implementation of electronic control of the second user interface component 160, the locking mechanism may include a separate locking switch or button that, when activated, maintains an electrical signal to keep the sequence valve 164 open or closed, regardless of the state of the main second user interface component 160. The electronic locking device may be integrated with the controller 140 to provide additional features such as automatic timeout functionality, visual or audible indicators of the locked state, or integration with other tool safety systems.

[0093] The locking mechanism 294 may also incorporate safety features to prevent unintentional activation or ensure proper release when needed. For example, the locking may include a two-step release process, require simultaneous activation of multiple controllers, or include an automatic release trigger based on tool orientation, pressure conditions, or elapsed time. These safety features help ensure the locking mechanism improves operational efficiency while maintaining safe tool operation under various working conditions.

[0094] refer to Figure 6-9In some examples, the lifting head 212 can be mechanically operated (e.g., translated) by a switch, slider, lever, or other type of second user interface component 160. In such examples, the user can actuate the lifting head 212 and thus the sequence valve 164 to the open position without the assistance of the controller 140 or another electronic actuator.

[0095] Reference Figure 6 and Figure 7 In some examples, plunger 232 can be moved to an open position via a second user interface component 160, which is configured as a slide switch 236. Slide switch 236 provides a direct mechanical interface allowing the user to manually control the automatic, pressure-based operation of sequence valve 164, giving the operator precise control when the hydraulic tool 100 transitions from high-speed to high-force operation. For example, the user can move (e.g., translate) slide switch 236 in a first direction to engage plunger 232 and move lifting head 212. Conversely, the user can move (e.g., translate) slide switch 236 in the opposite second direction to disengage plunger 232 and move lifting head 212. The sliding movement of slide switch 236 can be configured as a linear translation along a predetermined path, which can be guided by a track, groove, or channel formed in housing 104, providing smooth and consistent operation.

[0096] In the example shown, the slide switch 236 includes a base 240 engaged by the user and an extension 244. The base 240 may be ergonomically designed with a textured surface, finger grip, or contour shape to facilitate user manipulation and provide a secure engagement even when the operator is wearing work gloves or operating in complex environmental conditions. The extension 244 may extend from the base 240 at a non-zero angle to form a sloped surface configured to engage the head 248 of the plunger 232 to move the lifting head 212. The sloped configuration of the extension 244 provides the mechanical advantage of reducing the force required for the user to actuate the sequence valve 164 while ensuring reliable engagement with the plunger head 248. The angle of the extension 244 can be optimized to balance ease of actuation with the need for reliable valve operation. This angle, relative to the direction of the switch travel, can range from 5 to 15 degrees, 10 to 25 degrees, 15 to 30 degrees, 20 to 35 degrees, 25 to 40 degrees, or 30 to 45 degrees, etc.

[0097] In the example shown, the extension 244 may be initially positioned below the head 248 of the plunger 232 (e.g., between the head 248 and the exterior of the hydraulic tool 100). This positioning ensures that when the slide switch 236 is actuated, the extension 244 is properly aligned to engage the plunger head 248, while maintaining a gap during normal tool operation when the switch is not engaged. When the user translates (e.g., slides) the extension 244 toward the plunger 232 to act on the head 248, the head 248 can be moved by sliding engagement with the extension 244 to translate the plunger 232 and thus the lifting head 212, thereby opening the sequence valve 164 (see [link to product description]). Figure 7 The sliding engagement between the extension 244 and the plunger head 248 produces a cam-like action that converts the horizontal movement of the slide switch 236 into the vertical movement required to lift the lifting head 212 from the valve seat 217. This mechanical arrangement provides tactile feedback to the user, allowing the operator to feel the valve's response and confirm successful actuation through the physical resistance and motion characteristics of the connected components. The slide switch 236 may also include a braking position or spring-loaded mechanism that provides positive feedback when the valve reaches the fully open position, thereby ensuring reliable operation and preventing partial valve opening that could lead to inconsistent tool performance.

[0098] refer to Figure 8 and 9 In some examples, plunger 232 can be moved to an open position via a second user interface component 160 configured as lever switch 252. Lever switch 252 provides a mechanical advantage system that reduces the force required for the user to actuate sequence valve 164 while providing precise control over valve operation. For example, a first lever end 256 of lever switch 252 may be initially positioned below the head 248 of plunger 232 (e.g., between the head 248 and the exterior of hydraulic tool 100). The first lever end 256 may include a contact surface or engagement feature shaped to engage with plunger head 248, thereby ensuring reliable engagement and preventing slippage during actuation.

[0099] Depressing the second lever end 260, which is opposite to the first lever end 256, causes the lever switch 252 to rotate about the fulcrum 262, thereby translating the first lever end 256 to move the plunger 232 and thus the lifting head 212, thereby opening the sequence valve 164 (see...). Figure 9The fulcrum 262 can be positioned to provide an optimal mechanical efficiency ratio. That is, the length ratio of the first lever end 256 to the second lever end 260 can be within the range of 1:1 to 1:2, 1:2 to 1:3, 1:3 to 1:4, 1:4 to 1:5, or 1:5 to 1:7, etc. This allows the user to apply a relatively small force at the second lever end 260 to generate sufficient force at the first lever end 256 to overcome the spring bias of the lifting head 212. The lever switch 252 can be ergonomically designed at the second lever end 260 with a textured surface, finger grip, or contour shape to facilitate user operation and provide a secure engagement even when the operator is wearing work gloves.

[0100] When the second lever end 260 is released, the bias of the spring 220 of the lifting head 212 returns the lever switch 252 to its initial position, automatically closing the sequence valve 164 and returning the hydraulic tool 100 to single-chamber operation. This automatic return mechanism ensures that the hydraulic tool 100 defaults to high-speed operation when the user does not actively engage the lever switch 252, as long as the current hydraulic pressure does not hold the lifting head 212 in the open position. The spring 220 provides sufficient restoring force to overcome any friction or resistance within the lever mechanism, thereby ensuring a reliable return to the closed position even after prolonged use or under challenging environmental conditions. The automatic closing feature also serves as a safety mechanism to prevent the tool from unintentionally remaining in a slower, high-force mode, which could lead to undesirable operating characteristics if the user is unaware of the valve status. Furthermore, the spring-biased return system reduces operator fatigue by eliminating the need for the user to manually return the lever switch 252 to its initial position after each actuation cycle.

[0101] refer to Figure 10 and 11In some examples, the lifting head 212 can be moved from a closed position to an open position using an electronic actuator 264, such as a linear actuator, solenoid, motor, or other type of actuator. The electronic actuator 264 provides precise control over the timing and force applied to the actuation sequence valve 164, enabling consistent and repeatable valve operation regardless of environmental conditions or operator variability. In such an example, the second user interface component 160 can be actuated to allow the controller 140 to actuate the lifting head 212 using the electronic actuator 264. The electronic actuator 264 can be configured to respond to various types of user input, including momentary button presses, toggle switches, variable position control, or even proximity sensors that detect user intent without physical contact. The controller 140 can process input signals from the second user interface component 160 and generate appropriate control commands to actuate the electronic actuator 264, which may include pulse-width modulated signals for proportional control, digital on / off commands for binary operation, or variable voltage / current signals for analog control. The electronic actuator 264 may include a feedback mechanism, such as a position sensor, force sensor, or current monitoring, to provide the controller 140 with real-time information about the performance of the actuator and the position of the lifting head.

[0102] refer to Figure 10 and 11 In some examples, plunger 232 can be moved to the open position using an electronic actuator 264 that communicates with a second user interface component 160 via controller 140. The electronic actuator 264 provides precise, repeatable control over the operation of sequence valve 164 and can be integrated with various control algorithms to optimize tool performance. For example, a user can actuate the second user interface component 160 as a button, slider, trigger, or other user interface to cause the electronic actuator 264 to open the lifting head 212. The second user interface component 160 may include a haptic feedback mechanism, a visual indicator such as an LED, or an audible confirmation signal to provide the user with a clear indication of the valve status. Controller 140 can process input signals from the second user interface component 160 and generate appropriate control commands.

[0103] In the example shown, the electronic actuator 264 may be housed within an actuator housing 268, which provides protection against environmental contaminants, mechanical damage, and electromagnetic interference. The actuator housing 268 may be constructed of materials such as aluminum, steel, or reinforced polymers and may include sealing elements such as O-rings or gaskets to prevent the ingress of dust, moisture, or hydraulic fluid. The electronic actuator 264 (e.g., a solenoid, linear motor, piezoelectric actuator, or other linear actuator) may be configured to extend and retract the actuator base 272, also housed within the actuator housing 268. The electronic actuator 264 may operate at various voltage levels, such as 12V, 18V, 24V, or higher, depending on the power requirements and force output needed to reliably actuate the sequence valve 164. The actuator base 272 may include a position feedback sensor, a force sensor, or current monitoring capability to provide the controller 140 with information about the actuator's performance or the position of the lifting head. As described above, the actuator base 272 may include an inclined extension 276, which provides mechanical advantages and smooth engagement with the plunger 232.

[0104] In other examples, the sequence valve 164 itself may be an electronic actuator 264, such as a solenoid valve. For example, the electronic actuator 264 may use electromagnetic force to translate the lifting head 212 within the sequence valve 164. In this configuration, the sequence valve 164 may be constructed as an integrated solenoid valve assembly, where the solenoid coil is directly integrated into the valve body 218, eliminating the need for a separate mechanical linkage or external actuator. In response to user actuation of the second user interface component 160, the solenoid coil may be energized by the controller 140 to generate a magnetic field that directly moves the lifting head 212 against the bias of the spring 220. In other examples, the electronic actuator 264 may be configured to open and close the lifting head 212 using a lever mechanism, rotary actuator, linear motor, piezoelectric actuator, or other known actuator types. These alternative electronic actuators may offer different force characteristics, response speeds, or power consumption profiles depending on the specific application requirements. For example, rotary actuators can convert rotary motion into linear lifting head motion through cam or gear mechanisms, while piezoelectric actuators can provide precise positioning with minimal power consumption.

[0105] Figure 12An exemplary method 1200 for operating a power tool is illustrated, for example, for crimping, cutting, punching, or otherwise machining a workpiece using a hydraulic tool 100 or another power tool. Method 1200 may include one or more operations, functions, or actions as illustrated by one or more boxes. Moreover, based on desired implementation, various boxes may be combined into fewer boxes, divided into additional steps, and / or removed. It should be understood that, for this and other processes and methods disclosed herein, the flowchart illustrates one possible implementation of the functions and operations of this embodiment. Those skilled in the art will understand that alternative implementations are included within the scope of the exemplary embodiments of this disclosure, wherein functions may not be performed in the order shown or discussed, including substantially simultaneously or in reverse order, depending on the functions involved.

[0106] refer to Figure 12 In method 1200, at block 1204, method 1200 may include actuating a first user interface of a hydraulic tool to supply fluid from a pump to a first fluid chamber. The first user interface may be a trigger, button, or other actuable controller that initiates operation of the hydraulic tool. When actuated, the first user interface may cause the controller to activate a motor driving the pump, thereby drawing hydraulic fluid from a reservoir and pressurizing it for delivery to the hydraulic system. The pump may be a positive displacement pump, a gear pump, or other suitable pump type capable of producing sufficient pressure and flow rate for the intended application.

[0107] At block 1208, method 1200 may include establishing pressure within a first fluid chamber to translate a piston and actuate the working head toward the workpiece at a first velocity. When pressurized fluid enters the first fluid chamber, it acts on a first region of the piston, generating a force that overcomes any resistance from a return spring or external load. This initial phase of operation provides a rapid approach velocity, allowing the working head to advance quickly toward the workpiece, thereby reducing cycle time and improving operational efficiency.

[0108] At block 1212, method 1200 may include actuating a second user interface to actuate a sequence valve from a closed position to an open position. The second user interface provides the operator with manual control over the transition from high-speed to high-force operation, allowing the operator to determine the optimal timing for this transition based on visual feedback, workpiece positioning requirements, or specific application needs. This manual actuation capability allows the operator to override the pressure-based automatic operation of the sequence valve, thereby providing enhanced control and flexibility during critical phases of the work operation.

[0109] At block 1216, method 1200 includes supplying fluid from a pump to a second fluid chamber via a sequence valve. With the sequence valve opened by manual actuation or automatic pressure response, pressurized fluid from the pump can flow through the valve's inlet port, past a displaced lifting head, and out through the outlet port to reach the second fluid chamber. This creates a dual-chamber pressurization system in which both the first and second fluid chambers simultaneously receive pressurized fluid.

[0110] At block 1220, method 1200 includes establishing pressure in the second fluid chamber such that the fluids in the first and second fluid chambers simultaneously exert a force on the piston. Simultaneous pressurization of both chambers increases the total effective area of ​​the hydraulic pressure action, thereby increasing the total force output of the system, while simultaneously reducing the piston speed due to the increased volume that must be filled per unit piston stroke. This dual-chamber operation transforms the tool from a high-speed, low-force construction to a high-force, controlled-speed construction.

[0111] At box 1224, method 1200 may include aligning the workhead relative to the workpiece. The deceleration operation enabled by the dual-cavity structure allows the operator to finely adjust the position of the workhead relative to the workpiece. This allows the user to ensure proper alignment for optimal curling, cutting, or punching results. This alignment phase may include visual inspection of the workpiece position, adjustment of tool orientation, or repositioning of the workpiece within the workhead. The slower, controlled motion provides the operator with sufficient time to achieve precise positioning, thereby reducing the likelihood of misalignment operations that could lead to defective connections or damaged components.

[0112] At block 1228, method 1200 may include bending, cutting, or punching a workpiece. During this final stage, high-force, controlled-speed operation enabled by the dual-chamber system allows the tool to perform the intended action precisely and reliably. The increased force output ensures the desired compression or cutting of the workpiece material. The operation continues until the piston reaches the end of its stroke, or until the system pressure reaches a predetermined threshold indicating the completion of the work cycle. Upon completion, the system automatically retracts the piston via the activation of a release valve and a return spring, thus preparing the tool for the next work cycle.

[0113] In some embodiments, methods embodying aspects of the invention may be used to utilize, manufacture, or install the devices or systems disclosed herein. Accordingly, any description herein of a particular feature, capability, or intended purpose of a device or system is generally intended to include disclosures of methods for using such a device for its intended purpose, methods for otherwise realizing such capabilities, methods for manufacturing related components of such a device or system (or a device or system as a whole), and methods for installing the disclosed (or otherwise known) components to support such purpose or capability. Similarly, unless otherwise indicated or limited, any discussion herein of methods for manufacturing or using a particular apparatus or system, including the installation of an apparatus or system, is intended to inherently include disclosures of the features utilized and capabilities implemented by such apparatus or systems as embodiments of the invention.

[0114] Additionally, unless otherwise stated or limited, the terms “about” and “approximately” as used herein with respect to reference values ​​mean a change of ±15% or less from the reference value, including the endpoints of the range. Similarly, the term “substantially equal” (etc.) as used herein with respect to a reference value means a change of less than ±30% relative to the reference value, including the endpoints. Where specified, “substantially” may specifically indicate a change relative to the reference value in a numerical direction. For example, “substantially less than” etc., from a reference value indicates a value that is 30% or more less than the reference value, and “substantially greater than” etc., from a reference value indicates a value that is 30% or more more than the reference value.

[0115] As used herein, ordinal numbers are used solely for presentational purposes and are generally presented in an order corresponding to the order in which a particular feature is introduced in the relevant discussion. Thus, for example, a “first” feature need not necessarily have any desired structural or sequential relationship with a “second” feature, and so on. Furthermore, similar features may be represented by different ordinal numbers in different parts of the discussion. For example, a particular feature may be referred to as the “first” feature in some discussions, while a similar or substantially identical feature may be referred to as the “third” feature in other discussions, and so on.

[0116] As used herein, unless otherwise limited or specified, “substantially identical” means two or more parts or systems manufactured or used according to the same processes and specifications, wherein variations between the parts or systems are within the limits of acceptable tolerances of the relevant processes and specifications. For example, two parts may be considered substantially identical if they are manufactured according to the same standardized manufacturing steps, using the same materials, and within the same acceptable dimensional tolerances (e.g., as specified for a particular process or product).

[0117] Various advantageous embodiments have been described for purposes of illustration and description, and are not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those skilled in the art. Furthermore, different advantageous embodiments may provide different advantages compared to other advantageous embodiments. The selection and description of one or more embodiments are intended to best explain the principles of the embodiments, their practical application, and to enable others skilled in the art to understand the disclosure of various embodiments with various modifications suitable for the particular purpose contemplated.

Claims

1. A power tool, comprising: Cylinder; A pressure head, which is movably housed in the cylinder to define a first chamber and a second chamber; A pump, used to supply fluid to the first chamber and the second chamber; A sequence valve is operable between a first configuration and a second configuration, wherein the first configuration causes the pump to supply fluid to a first chamber to move the pressure head at a first speed, and the second configuration causes the pump to supply fluid to a second chamber to move the pressure head at a second speed, and the sequence valve moves from a first position to a second position based on the pressure in the first chamber; as well as A user interface that can be manually actuated by a user to move the sequence valve between the first configuration and the second configuration independently of the pressure in the first chamber.

2. The power tool of claim 1, wherein the sequence valve includes a lifting head that moves based on pressure in the first chamber or via actuation through a user interface.

3. The power tool of claim 2, further comprising a housing containing the cylinder, and the lifting head comprising a plunger extending outside the housing for actuation by a user.

4. The power tool according to claim 1, wherein, The user interface is configured as one of a lever, slider, button, and solenoid that applies external force to the lifting head.

5. The power tool according to claim 4, wherein, The user interface is directly and mechanically connected to the lifting head.

6. The power tool according to claim 4, wherein, The user interface is mechanically connected to the lifting head via a linkage device.

7. The power tool according to claim 4, wherein, The user interface communicates with an electronic controller, which activates an electronic actuator to move the lifting head.

8. The power tool according to claim 1, wherein, When the pressure in the first chamber reaches the threshold pressure, the sequence valve implements the second configuration independently of the actuation of the user interface.

9. The power tool of claim 1, further comprising a working head coupled to the pressure head to perform at least one of a crimping and a cutting operation.

10. A power tool, comprising: Actuator; A pump for supplying fluid to the actuator to extend or retract the actuator, the pump defining an opening; as well as A sequence valve includes a valve body positioned in the opening in the pump, a control element movable between a first position and a second position within the valve body, and a plunger extending from the valve body and configured to receive a user input portion, the user input portion causing the control element to move between the first position and the second position to change the speed of the actuator between a first speed and a second speed.

11. The power tool according to claim 10, wherein, The user input section is located at the user interface component connected to the plunger.

12. The power tool according to claim 11, wherein, The user interface component includes a mechanical linkage device.

13. The power tool according to claim 11, wherein, The user interface component includes an electronic actuator.

14. The power tool according to claim 11, wherein, The control element moves from the first position to the second position based on the pressure of the fluid supplied to the first chamber, independent of the user input.

15. The power tool according to claim 11, wherein, The control element is a lifting head, which engages with a valve seat in the valve body at the first position and disengages from the valve seat at the second position.

16. The power tool according to claim 15, wherein, When the lifting head is in the first position, fluid is supplied only to the first chamber of the actuator, and When the lifting head is in the second position, fluid is supplied to both the first and second chambers of the actuator.

17. A method for operating a hydraulic power tool, the method comprising: Actuate the first user interface of the hydraulic power tool to supply fluid from the pump to the first fluid chamber, thereby moving the pressure head at a first speed; as well as The second user interface is manually actuated to move the lifting head of the sequence valve from the closed position to the open position to supply fluid from the pump to the second fluid chamber, thereby moving the pressure head at a second speed different from the first speed. The second user interface can be actuated independently of the pressure in the first fluid chamber.

18. The method according to claim 17, wherein, Manually actuating the second user interface includes actuating a mechanical linkage that directly engages the lifting head to move the lifting head from the closed position to the open position.

19. The method according to claim 18, wherein, The mechanical linkage device includes one of a slide switch, a lever switch, or a button, which mechanically shifts the lifting head against the biasing force of the spring.

20. The method of claim 17, wherein, Manually actuating the second user interface includes operating an electronic switch that causes an electronic actuator to move the lifting head from the closed position to the open position.

Images