US20200378524A1 - Overload protection valve - Google Patents
Overload protection valve Download PDFInfo
- Publication number
- US20200378524A1 US20200378524A1 US16/995,087 US202016995087A US2020378524A1 US 20200378524 A1 US20200378524 A1 US 20200378524A1 US 202016995087 A US202016995087 A US 202016995087A US 2020378524 A1 US2020378524 A1 US 2020378524A1
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- US
- United States
- Prior art keywords
- overload protection
- cam
- protection valve
- inner slide
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/56—Mechanical actuating means without stable intermediate position, e.g. with snap action
- F16K31/563—Mechanical actuating means without stable intermediate position, e.g. with snap action for rotating or pivoting valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/26—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members with fluid passages in the valve member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/34—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/52—Mechanical actuating means with crank, eccentric, or cam
- F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
- F16K31/52458—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a tap or cock
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/52—Mechanical actuating means with crank, eccentric, or cam
- F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
- F16K31/52475—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a sliding valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
- F16K5/0457—Packings
Definitions
- grabbing mechanisms to grab, hold, lift, and move objects.
- These mechanisms may include hooks, pneumatically operated claws or grabbers, etc.
- the load of an object that these being moved may be greater than what the system is able to effectively or safely move. As such, the system may fail which can potentially cause damage or injury to the system, the object, other nearby objects, as well as any human operators.
- the valve includes an outer housing having an end wall; a cam arranged at least partially within the outer housing; an inner slide including a side wall, a shelf area, an internal barrier, an inlet and an outlet, each of the inlet and outlet including an opening through the side wall, the inlet and the outlet being separated by the internal barrier; and an overload spring arranged between the end wall and the shelf area configured to define a load on the valve which will cause the valve to open.
- the cam is configured such that when the valve is closed, the defined load on the valve will cause the cam to rotate in order to allow the openings of the inlet and outlet to be in fluid communication with one another and open the valve.
- the system also includes a cam pin extending from an interior surface of the cam.
- the cam pin extends into a slot of the inner slide.
- the slot includes first and second slot portions arranged at an angle of 90 degrees or less from one another.
- the cam pin is configured to move within the slot of the inner slide when the defined load is attached to the overload protection valve.
- the system also includes an inner slide pin extending from an exterior surface of the inner slide. In this example, the inner slide pin extends into a slot of the cam. In addition or alternatively, the inner slide pin is configured to move within the slot of the inner slide when the defined load is attached to the overload protection valve and causes the cam to rotate.
- the cam includes at least three grooves on an interior surface of the cam.
- each of the grooves includes a sealing O-ring.
- each sealing O-ring is arranged around the inner slide.
- a first pair of the sealing O-rings form a first compartment between the inner slide and the cam
- a second pair of the sealing O-rings forms a second compartment between the inner slide and the cam.
- the valve is closed the opening of the inlet is in fluid communication with the first compartment.
- the valve is closed the opening of the outlet is in fluid communication with the second compartment.
- the openings of the inlet and the outlet are in fluid communication with the second compartment.
- the system also includes a cam actuation spring arranged around the inner slide and configured to provide a pushing force on the cam.
- the system also includes a pressurized fluid source configured to provide fluid to the overload protection valve.
- the system also includes a grabbing mechanism, and when the overload protection valve is open, the fluid is able to pass to the grabbing mechanism.
- the grabbing mechanism is configured to automatically release the defined load when the fluid passes to the grabbing mechanism.
- the system also includes the defined load.
- FIG. 1 is a functional diagram of a system in accordance with aspects of the present disclosure.
- FIG. 2 is a cross-sectional view of an overload protection valve in accordance with aspects of the disclosure.
- FIG. 3 is a perspective view of an inner slide in accordance with aspects of the disclosure.
- FIG. 4 is partial a cross-sectional view of an overload protection valve in accordance with aspects of the disclosure.
- FIG. 5A is a perspective view of a cam in accordance with aspects of the disclosure.
- FIG. 5B is a perspective view of a cam in accordance with aspects of the disclosure.
- FIG. 5C is a cross-sectional view of a cam in accordance with aspects of the disclosure.
- FIG. 6 is a perspective view of a ring in accordance with aspects of the disclosure.
- FIG. 7 is a partial perspective view of an overload protection valve in accordance with aspects of the disclosure.
- FIG. 8A is a partial perspective view of an overload protection valve in accordance with aspects of the disclosure.
- FIG. 8B is a partial perspective view of an overload protection valve in accordance with aspects of the disclosure.
- FIG. 9 is a partial perspective view of an overload protection valve in accordance with aspects of the disclosure.
- FIG. 10 is partial a cross-sectional view of an overload protection valve in accordance with aspects of the disclosure.
- FIG. 11 is partial a cross-sectional view of an overload protection valve and fluid path in accordance with aspects of the disclosure.
- the technology relates to mechanisms to allow a system to automatically release a load in order to prevent reduce a likelihood of damage to the system, and in some cases, catastrophic damage in an unforeseen loading scenario.
- a valve may be used to automatically release the object while the object is being initially lifted by the crane.
- the crane may be able to support the weight of an object, but if there is a sudden wind event or other unpredicted high load scenario, rather than pulling down the entire crane, the valve may fire at a predetermined load and automatically release the object, thereby preventing catastrophic failure.
- Similar situations may occur in systems that are used to pull, as opposed to push, objects, such as towing mechanisms. In such situations, the valve may again fire if the load is too great, releasing the object and avoiding damage to the features of the system.
- An example system may include a moving mechanism, connected to a grabbing mechanism which together can be used to lift, pull, or otherwise move a load or object.
- An overload protection valve may be arranged between the moving mechanism and the grabbing mechanism to prevent the moving mechanism from lifting or pulling an object greater than a predetermined weight and avoid damage to the object, grabbing mechanism and even the lifting mechanism.
- the moving mechanism may include a device that can be used to move and release objects.
- the moving mechanism may be attached to or include a pressurized fluid source or other device which can provide pressurized fluid to the valve.
- the grabbing mechanism may include any type of grabbing mechanism capable of automatically releasing the object pneumatically or hydraulically.
- the valve may include an outer housing, a cam, a cam actuation spring, an overload spring, and an inner slide.
- the inner slide may include an outlet end including an outlet and an inlet end including an inlet.
- the inlet end may be attached to the moving mechanism and in fluid communication with the air source, and the outlet end may be in fluid communication with the grabbing mechanism.
- the inlet and outlet may be separated by an internal wall prevents fluid from passing directly between the inlet the outlet.
- each of the inlet and the outlet include respective openings that extend completely through an outer wall of the inner slide.
- the inner slide may also include a shelf area arranged between the cam actuation spring and the overload spring.
- the overload spring may be sized according to the predetermined load selected for automatically opening the valve.
- the cam actuation spring may be arranged between the shelf area and the cam. As such, the cam actuating spring may be sized in order to provide a sufficient pushing force on the cam to move the cam in order to unlock or open the valve.
- the outer housing may include an end wall. Together the shelf area and the end wall may define a space for the overload spring. As such, during loading, both the end wall and the shelf area may provide a compression force on the overload spring as the shelf area is pulled towards the end wall.
- the cam may include a plurality of grooves on an interior surface of the cam.
- Each groove may include a respective seal sized to provide an air and fluid tight barrier between the cam and the inner slide during typical or expected operating temperature configurations for the valve. Together, the seals and grooves together may form first and second compartments between the cam and the inner slide.
- the first compartment When the valve is in the closed or locked configuration, the first compartment may be in fluid communication with the first opening in the inlet and the second compartment may be in fluid communication with the second opening in the outlet.
- the second compartment When the valve is in the unlocked or open configuration, the second compartment may be in fluid communication with both the first opening and the second opening.
- Each of the cam and the inner slide may include a respective pin and a respective slot.
- the cam pin may extend into the slot of the inner slide, and an inner slide pin may extend into the slot of the cam.
- the shape of each slot defines the path of the corresponding pin in that slot.
- the object will provide a pulling/resistance force at the outlet end of the inner slide.
- the inner slide pin may move within and follow the shape of the first slot portion of the slot of the cam.
- the overload spring may slow or limit this movement of the inner slide pin within the slot of the cam.
- the movement of the inner slide pin within and along the first slot portion of the slot of the cam may cause the cam to rotate. This rotation of the cam may cause the cam pin to slide within the first slot portion of the slot of the inner slide. Eventually, the cam pin and inner slide pin may align with the second slot portions of the slots of the inner slide and cam, respectively. At this point, the pulling/resistance of the object will pull the inner slide pin along the second slot portion of the slot of the cam. At the same time, the cam actuation spring will expand and push the cam away from the shelf area causing the cam pin to move along the second slot portion 756 of the slot of the inner slide.
- Movement of the cam away from the object will reposition the seals and relative to the inner slide such that the first and second openings will each be within the second compartment thereby unlocking the valve and allowing fluid to pass from the inlet to the outlet.
- fluid from the fluid source may then pass to the grabbing mechanism causing the grabbing mechanism to automatically release the object, pneumatically or hydraulically.
- the features described above provide for predictive failure of a system configured to lift, pull, or otherwise move a load.
- the system is able to fail in a controlled, safe way, rather than in a dangerous way.
- the size and configuration of the overload spring may define exactly how much weight will cause the valve to open making the valve functional for any number of different situations, systems and objects.
- the valve described herein may be employed in any pneumatic or hydraulic lifting, holding, and/or moving application as an overload prevention device.
- the valve may be configured not only to protect the object, but also to protect the moving mechanism. When the valve is pulled in tension, at a certain load the valve is opened, providing gas, air, or fluid to the downstream pneumatic or hydraulic line. This opening happens very quickly, as to enable fast release of pressure and thus emergency release of the load.
- FIG. 1 includes an example system 1 including a moving mechanism 10 , connected to a grabbing mechanism 30 which together can be used to lift (vertically), pull (horizontally), or otherwise move a load or object 40 .
- An overload protection valve 100 may be arranged between the moving mechanism 10 and the grabbing mechanism 30 to prevent the moving mechanism from lifting or pulling an object greater than a predetermined load (weight or resistance force) and avoid damage to the object 40 , grabbing mechanism, the lifting mechanism, and even any objects or human operators proximate to the system 1 .
- the arrows 50 , 52 , 54 each represent mechanical connections between the moving mechanism 10 and the valve 100 , between the valve and the grabbing mechanism 30 , and between the grabbing mechanism 30 and the object 30 , respectively, as discussed in further detail below. This example should not be considered as limiting the scope of the disclosure or usefulness of the features described herein.
- the moving mechanism 10 may include a tool (such as a handheld or larger device), a machine for towing (such as a car, truck, or train), or other device that can be used to move and release objects such as robotic arms, assembly machine parts, construction equipment, sorting machines, pick and place robots, various types of cranes, including gantry cranes and jib cranes, etc.
- the moving mechanism 10 may be attached to or include a pressurized fluid source 20 such as an air source, compressor, or other device which can provide pressurized fluid (air or gas) to the valve.
- the grabbing mechanism 30 may include any type of grabbing mechanism capable of automatically releasing the object pneumatically or hydraulically.
- the grabbing mechanism may include a hook, claw, grabbers, tow or other hitch, etc. that can grab the object and when supplied with pressurized fluid (such as air or gas) will automatically release the object.
- the valve 100 may include an outer housing 110 , a cam 120 , a cam actuation spring 130 , an overload spring 140 , and an inner slide 150 .
- FIG. 3 is a perspective view of the inner slide 150
- FIG. 4 is a cross-sectional partial perspective view of the valve 100 with the outer housing 110 being depicted as transparent (dashed line) for ease of viewing and understanding.
- the inner slide 150 includes an outlet end including an outlet 152 and an inlet end including an inlet 154 .
- the inlet end may be attached to the moving mechanism and in fluid communication with the pressurized fluid source 20 , and the outlet end may be in fluid communication with the grabbing mechanism.
- These connections may include, for instance, bolts and/or other mechanical connections such as pins, threading, etc.
- the inlet 154 and the outlet 152 are separated by an internal barrier or wall 156 which prevents fluid from passing directly between the inlet and the outlet.
- each of the inlet 154 and the outlet 152 include respective openings, corresponding to first and second openings 352 , 354 that extend completely through an outer wall 356 of the inner slide.
- the inner slide 150 also includes a shelf area 158 arranged between the cam actuation spring 130 and the overload spring 140 .
- the overload spring 140 may be arranged around the inner slide 150 and may be sized according to the predetermined load selected for automatically opening the valve 100 as discussed further below.
- the shelf area 158 may also provide support for the cam actuation spring 130 .
- the cam actuation spring 130 is arranged between the shelf area 158 and the cam 120 and around the inner slide 150 . As such, the cam actuating spring 130 may be sized in order to provide a sufficient pushing force on the cam 120 to move the cam in order to open or unlock the valve 100 .
- the outer housing 110 may include an end wall 112 . Together the shelf area 158 and the end wall 112 define a space for the overload spring 140 . As such, during loading, both the end wall 112 and the shelf area 158 may provide a compression force on the overload spring 140 as the shelf area 158 is pulled towards the end wall 112 .
- FIGS. 5A, 5B, and 5C are perspective, side, and cross-sectional views of the cam 120 .
- the cam includes a side wall 520 including an inward facing interior surface 522 and an outward facing exterior surface 524 .
- the cam 120 may include a plurality of grooves 122 , 124 , 126 on the interior surface 522 . As the cam 120 has a cylindrical shape, each of the grooves may be annular grooves that extend 360 degrees around the interior surface 522 .
- each groove 122 , 124 , 126 may include a respective seal.
- FIG. 6 is a perspective view of an example seal 600 .
- Seal 600 may be a sealing O-ring made of rubber, plastics, silicone, etc. and sized to provide an air and fluid tight barrier between the cam and the inner slide during typical or expected operating temperature configurations for the valve.
- the cam 120 When configured as valve 100 , the cam 120 is concentric about the inner slide 150 .
- seals such as seal 600 (not shown for ease of viewing and understanding)
- the seals and grooves together may form first and second compartments 160 , 162 between the cam 120 and the inner slide 150 .
- a first seal 600 in groove 122 and a second seal in groove 124 may form compartment 160 between the cam 120 and the inner slide 150 .
- the second seal 600 in groove 124 and a third seal 600 in groove 126 may for the compartment 162 between the cam 120 and the inner slide 150 . Accordingly, when in the closed or locked configuration, the second seal within groove 154 prevents fluid from passing between the inlet 154 and the outlet 152 via the openings
- the first compartment 160 When the valve 100 is in the closed or locked configuration, the first compartment 160 may be in fluid communication with the first opening 352 in the inlet 154 and the second compartment 162 may be in fluid communication with the second opening 354 in the outlet 152 . In this configuration, the seal within groove 124 may prevent fluid from passing between the first and second compartments.
- the second compartment 162 When the valve 100 is in the unlocked or open configuration, the second compartment 162 may be in fluid communication with both the first opening 352 and the second opening 354 . In this configuration, fluid is able to pass from the inlet 154 to the outlet 152 by way of the second compartment 162 .
- FIG. 7 depicts the cam 120 and inner slide 150 when the valve is in the closed or locked configuration.
- each of the cam 120 and the inner slide 150 may include a respective pin 720 , 750 and a respective slot 722 , 752 .
- the cam 120 , cam pin 720 , and slot 722 are shown as transparent (dashed line) and the seals 600 are not shown in FIG. 7 .
- the slot 722 in the cam 120 may extend partially into (i.e. as a groove) or completely through (i.e. as a hole) the side wall 520 of the cam 120 .
- the cam pin 720 extends into the slot 752 of the inner slide, and the inner slide pin 750 extends into the slot 722 of the cam 120 .
- Each of the pins may be sized (length and width) to be able to slide within the corresponding slots.
- cam pin 720 may be sized to slide within slot 752 of the inner slide 150
- inner slide pin 750 may be sized to slide within the slot 722 of the cam 120 .
- the shape of each slot defines the path of the corresponding pin in that slot.
- Each slot has a respective first slot portion 724 , 754 and a respective second slot portion 726 , 756 .
- the first and second slot portions of each of the slots may be arranged at an angle ⁇ 1 ( FIG. 5 ), 02 ( FIG. 7 ) relative to one another in a “check” (less than a 90 degree angle) or “L” (at or approximately a 90 degree angle) shape corresponding to a “check mark” or “L” shaped path for the corresponding pin in that
- the object will provide a pulling/resistance force at the outlet end of the inner slide 150 .
- moving mechanism 30 will provide a pulling force at the inlet end of the inner slide 150 .
- the inner slide 150 including the shelf area 158 , to move towards the object 40 .
- the inner slide pin 750 may move within and follow the shape of the first slot portion 724 of the slot 722 of the cam 120 .
- the overload spring 140 may slow or limit this movement of the cam pin 720 within the slot 752 of the inner slide 150 depending upon the pulling/resistance force provided by the object 40 . How much the overload spring 140 is able to limit this movement may be a direct result of the sizing or spring force constant of the overload spring.
- the sizing of the overload spring may define a load on the valve 100 which will cause the valve to open. For instance, if the pulling/resistance force provided by the object 40 is very small relative to the sizing of the overload spring 140 , the overload spring 140 may completely prevent the inner slide pin 750 from moving within the first slot portion 724 of the slot 722 of the cam 120 . As the pulling/resistance is increased relative to the sizing of the overload spring 140 , the amount of movement of the inner slide pin 750 within and along the first slot portion 724 of the slot 722 of the cam 120 will increase.
- Movement of the inner slide pin 750 within and along the first slot portion 724 of the slot 722 in combination with the shape of the first slot portion 724 of the slot 722 of the cam, may cause the cam 120 to rotate.
- Arrow 800 of FIG. 8A indicates the direction of the rotation of the cam 120 .
- the cam 120 , cam pin 720 , and slot 722 are shown as transparent (dashed line) and the seals 600 are not shown in FIG. 8A .
- This rotation of the cam 120 may cause the cam pin 720 to slide within first slot portion 754 of the slot 752 of the inner slide 150 .
- cam pin 720 and inner slide pin 750 will align with the second slot portions 756 , 726 of the slots 752 , 722 of the inner slide 150 and cam 120 , respectively, as shown in the example of FIG. 8B .
- the cam 120 , cam pin 720 , and slot 722 are shown as transparent (dashed line) and the seals 600 are not shown in FIG. 8B .
- the pulling/resistance of the object 40 will pull the inner slide pin 750 along the second slot portion 726 of the slot 722 of the cam 120 as shown in FIG. 9 .
- the cam 120 , cam pin 720 , and slot 722 are shown as transparent (dashed line) and the seals 600 are not shown in FIG. 9 .
- the cam actuation spring 130 will expand and push the cam 120 away from the shelf area 158 causing the cam pin 720 to move along the second slot portion 756 of the slot 752 of the inner slide 150 .
- FIG. 10 is a cross sectional view of the valve 100 , again without the seals 600 for ease of viewing and understanding, with the valve in the open or unlocked configuration.
- FIG. 11 corresponds to the view of FIG. 10 highlighting an example path 1100 (including path portions 1110 - 1160 ) of fluid as it moves from the inlet end to the outlet end of the valve 100 when the valve is in the open or unlocked configuration.
- fluid from the pressurized fluid source 20 enters the inlet along path portion 1110 , passes from the inlet into the inlet opening along path portion 1120 , passes from the inlet opening into the second compartment along path portion 1130 , passes from the second compartment into the outlet opening along path portion 1140 , passes from the outlet opening into the outlet along path portion 1150 , and passes to the grabbing mechanism 30 from the outlet along path portion 1160 .
- the fluid may cause the grabbing mechanism to automatically release the object 40 , thereby allowing a fast release of the object, preventing an overload of system 1 , and preventing damage to the system as well as any nearby objects or human operators.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanically-Actuated Valves (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
- The present application is a continuation of U.S. patent application Ser. No. 15/910,198, filed Mar. 2, 2018, the entire disclosure of which is incorporated by reference herein.
- Various systems, such as cranes, towing machines, and other devices, employ grabbing mechanisms to grab, hold, lift, and move objects. These mechanisms may include hooks, pneumatically operated claws or grabbers, etc. In some instances, the load of an object that these being moved may be greater than what the system is able to effectively or safely move. As such, the system may fail which can potentially cause damage or injury to the system, the object, other nearby objects, as well as any human operators.
- Aspects of the present disclosure provide a system including an overload protection valve. The valve includes an outer housing having an end wall; a cam arranged at least partially within the outer housing; an inner slide including a side wall, a shelf area, an internal barrier, an inlet and an outlet, each of the inlet and outlet including an opening through the side wall, the inlet and the outlet being separated by the internal barrier; and an overload spring arranged between the end wall and the shelf area configured to define a load on the valve which will cause the valve to open. In addition, the cam is configured such that when the valve is closed, the defined load on the valve will cause the cam to rotate in order to allow the openings of the inlet and outlet to be in fluid communication with one another and open the valve.
- In one example, the system also includes a cam pin extending from an interior surface of the cam. In this example, the cam pin extends into a slot of the inner slide. In addition, the slot includes first and second slot portions arranged at an angle of 90 degrees or less from one another. In addition or alternatively, the cam pin is configured to move within the slot of the inner slide when the defined load is attached to the overload protection valve. In another example, the system also includes an inner slide pin extending from an exterior surface of the inner slide. In this example, the inner slide pin extends into a slot of the cam. In addition or alternatively, the inner slide pin is configured to move within the slot of the inner slide when the defined load is attached to the overload protection valve and causes the cam to rotate. In another example, the cam includes at least three grooves on an interior surface of the cam. In this example, each of the grooves includes a sealing O-ring. In addition, each sealing O-ring is arranged around the inner slide. In addition, a first pair of the sealing O-rings form a first compartment between the inner slide and the cam, and a second pair of the sealing O-rings forms a second compartment between the inner slide and the cam. In addition, the valve is closed the opening of the inlet is in fluid communication with the first compartment. In addition, the valve is closed the opening of the outlet is in fluid communication with the second compartment. In addition, when the valve is open, the openings of the inlet and the outlet are in fluid communication with the second compartment. In another example, the system also includes a cam actuation spring arranged around the inner slide and configured to provide a pushing force on the cam. In another example, the system also includes a pressurized fluid source configured to provide fluid to the overload protection valve. In this example, the system also includes a grabbing mechanism, and when the overload protection valve is open, the fluid is able to pass to the grabbing mechanism. In addition, the grabbing mechanism is configured to automatically release the defined load when the fluid passes to the grabbing mechanism. In addition, the system also includes the defined load.
-
FIG. 1 is a functional diagram of a system in accordance with aspects of the present disclosure. -
FIG. 2 is a cross-sectional view of an overload protection valve in accordance with aspects of the disclosure. -
FIG. 3 is a perspective view of an inner slide in accordance with aspects of the disclosure. -
FIG. 4 is partial a cross-sectional view of an overload protection valve in accordance with aspects of the disclosure. -
FIG. 5A is a perspective view of a cam in accordance with aspects of the disclosure. -
FIG. 5B is a perspective view of a cam in accordance with aspects of the disclosure. -
FIG. 5C is a cross-sectional view of a cam in accordance with aspects of the disclosure. -
FIG. 6 is a perspective view of a ring in accordance with aspects of the disclosure. -
FIG. 7 is a partial perspective view of an overload protection valve in accordance with aspects of the disclosure. -
FIG. 8A is a partial perspective view of an overload protection valve in accordance with aspects of the disclosure. -
FIG. 8B is a partial perspective view of an overload protection valve in accordance with aspects of the disclosure. -
FIG. 9 is a partial perspective view of an overload protection valve in accordance with aspects of the disclosure. -
FIG. 10 is partial a cross-sectional view of an overload protection valve in accordance with aspects of the disclosure. -
FIG. 11 is partial a cross-sectional view of an overload protection valve and fluid path in accordance with aspects of the disclosure. - The technology relates to mechanisms to allow a system to automatically release a load in order to prevent reduce a likelihood of damage to the system, and in some cases, catastrophic damage in an unforeseen loading scenario. For instance, where a crane is used to lift an object, and the crane would be unable to support the weight of the object, a valve may be used to automatically release the object while the object is being initially lifted by the crane. In some cases, the crane may be able to support the weight of an object, but if there is a sudden wind event or other unpredicted high load scenario, rather than pulling down the entire crane, the valve may fire at a predetermined load and automatically release the object, thereby preventing catastrophic failure. Similar situations may occur in systems that are used to pull, as opposed to push, objects, such as towing mechanisms. In such situations, the valve may again fire if the load is too great, releasing the object and avoiding damage to the features of the system.
- An example system may include a moving mechanism, connected to a grabbing mechanism which together can be used to lift, pull, or otherwise move a load or object. An overload protection valve may be arranged between the moving mechanism and the grabbing mechanism to prevent the moving mechanism from lifting or pulling an object greater than a predetermined weight and avoid damage to the object, grabbing mechanism and even the lifting mechanism.
- The moving mechanism may include a device that can be used to move and release objects. The moving mechanism may be attached to or include a pressurized fluid source or other device which can provide pressurized fluid to the valve. The grabbing mechanism may include any type of grabbing mechanism capable of automatically releasing the object pneumatically or hydraulically.
- The valve may include an outer housing, a cam, a cam actuation spring, an overload spring, and an inner slide. The inner slide may include an outlet end including an outlet and an inlet end including an inlet. The inlet end may be attached to the moving mechanism and in fluid communication with the air source, and the outlet end may be in fluid communication with the grabbing mechanism. The inlet and outlet may be separated by an internal wall prevents fluid from passing directly between the inlet the outlet. In addition each of the inlet and the outlet include respective openings that extend completely through an outer wall of the inner slide.
- The inner slide may also include a shelf area arranged between the cam actuation spring and the overload spring. The overload spring may be sized according to the predetermined load selected for automatically opening the valve. The cam actuation spring may be arranged between the shelf area and the cam. As such, the cam actuating spring may be sized in order to provide a sufficient pushing force on the cam to move the cam in order to unlock or open the valve.
- The outer housing may include an end wall. Together the shelf area and the end wall may define a space for the overload spring. As such, during loading, both the end wall and the shelf area may provide a compression force on the overload spring as the shelf area is pulled towards the end wall.
- The cam may include a plurality of grooves on an interior surface of the cam. Each groove may include a respective seal sized to provide an air and fluid tight barrier between the cam and the inner slide during typical or expected operating temperature configurations for the valve. Together, the seals and grooves together may form first and second compartments between the cam and the inner slide.
- When the valve is in the closed or locked configuration, the first compartment may be in fluid communication with the first opening in the inlet and the second compartment may be in fluid communication with the second opening in the outlet. When the valve is in the unlocked or open configuration, the second compartment may be in fluid communication with both the first opening and the second opening.
- Each of the cam and the inner slide may include a respective pin and a respective slot. The cam pin may extend into the slot of the inner slide, and an inner slide pin may extend into the slot of the cam. The shape of each slot defines the path of the corresponding pin in that slot.
- During loading, when the grabbing mechanism is attached to a load or object and the moving mechanism begins attempt to move the object, the object will provide a pulling/resistance force at the outlet end of the inner slide. As the inner slide is pulled towards the object, the inner slide pin may move within and follow the shape of the first slot portion of the slot of the cam. The overload spring may slow or limit this movement of the inner slide pin within the slot of the cam.
- The movement of the inner slide pin within and along the first slot portion of the slot of the cam may cause the cam to rotate. This rotation of the cam may cause the cam pin to slide within the first slot portion of the slot of the inner slide. Eventually, the cam pin and inner slide pin may align with the second slot portions of the slots of the inner slide and cam, respectively. At this point, the pulling/resistance of the object will pull the inner slide pin along the second slot portion of the slot of the cam. At the same time, the cam actuation spring will expand and push the cam away from the shelf area causing the cam pin to move along the
second slot portion 756 of the slot of the inner slide. - Movement of the cam away from the object will reposition the seals and relative to the inner slide such that the first and second openings will each be within the second compartment thereby unlocking the valve and allowing fluid to pass from the inlet to the outlet. In this configuration, fluid from the fluid source may then pass to the grabbing mechanism causing the grabbing mechanism to automatically release the object, pneumatically or hydraulically.
- The features described above provide for predictive failure of a system configured to lift, pull, or otherwise move a load. In other words, the system is able to fail in a controlled, safe way, rather than in a dangerous way. In addition, the size and configuration of the overload spring may define exactly how much weight will cause the valve to open making the valve functional for any number of different situations, systems and objects. In addition, the valve described herein may be employed in any pneumatic or hydraulic lifting, holding, and/or moving application as an overload prevention device. As noted above, the valve may be configured not only to protect the object, but also to protect the moving mechanism. When the valve is pulled in tension, at a certain load the valve is opened, providing gas, air, or fluid to the downstream pneumatic or hydraulic line. This opening happens very quickly, as to enable fast release of pressure and thus emergency release of the load.
- Aspects, features and advantages of the disclosure will be appreciated when considered with reference to the foregoing description of embodiments and accompanying figures. The same reference numbers in different drawings may identify the same or similar elements. Furthermore, the following description is not limiting; the scope of the present technology is defined by the appended claims and equivalents.
-
FIG. 1 includes anexample system 1 including a movingmechanism 10, connected to a grabbingmechanism 30 which together can be used to lift (vertically), pull (horizontally), or otherwise move a load orobject 40. Anoverload protection valve 100 may be arranged between the movingmechanism 10 and the grabbingmechanism 30 to prevent the moving mechanism from lifting or pulling an object greater than a predetermined load (weight or resistance force) and avoid damage to theobject 40, grabbing mechanism, the lifting mechanism, and even any objects or human operators proximate to thesystem 1. Thearrows mechanism 10 and thevalve 100, between the valve and the grabbingmechanism 30, and between the grabbingmechanism 30 and theobject 30, respectively, as discussed in further detail below. This example should not be considered as limiting the scope of the disclosure or usefulness of the features described herein. - The moving
mechanism 10 may include a tool (such as a handheld or larger device), a machine for towing (such as a car, truck, or train), or other device that can be used to move and release objects such as robotic arms, assembly machine parts, construction equipment, sorting machines, pick and place robots, various types of cranes, including gantry cranes and jib cranes, etc. The movingmechanism 10 may be attached to or include a pressurizedfluid source 20 such as an air source, compressor, or other device which can provide pressurized fluid (air or gas) to the valve. - The grabbing
mechanism 30 may include any type of grabbing mechanism capable of automatically releasing the object pneumatically or hydraulically. For instance, the grabbing mechanism may include a hook, claw, grabbers, tow or other hitch, etc. that can grab the object and when supplied with pressurized fluid (such as air or gas) will automatically release the object. - As shown in the cross-sectional perspective view of
FIG. 2 , thevalve 100 may include anouter housing 110, acam 120, acam actuation spring 130, anoverload spring 140, and aninner slide 150.FIG. 3 is a perspective view of theinner slide 150, andFIG. 4 is a cross-sectional partial perspective view of thevalve 100 with theouter housing 110 being depicted as transparent (dashed line) for ease of viewing and understanding. - The
inner slide 150 includes an outlet end including anoutlet 152 and an inlet end including aninlet 154. The inlet end may be attached to the moving mechanism and in fluid communication with the pressurizedfluid source 20, and the outlet end may be in fluid communication with the grabbing mechanism. These connections may include, for instance, bolts and/or other mechanical connections such as pins, threading, etc. Theinlet 154 and theoutlet 152 are separated by an internal barrier orwall 156 which prevents fluid from passing directly between the inlet and the outlet. In addition each of theinlet 154 and theoutlet 152 include respective openings, corresponding to first andsecond openings outer wall 356 of the inner slide. - The
inner slide 150 also includes ashelf area 158 arranged between thecam actuation spring 130 and theoverload spring 140. Theoverload spring 140 may be arranged around theinner slide 150 and may be sized according to the predetermined load selected for automatically opening thevalve 100 as discussed further below. Theshelf area 158 may also provide support for thecam actuation spring 130. Thecam actuation spring 130 is arranged between theshelf area 158 and thecam 120 and around theinner slide 150. As such, thecam actuating spring 130 may be sized in order to provide a sufficient pushing force on thecam 120 to move the cam in order to open or unlock thevalve 100. - The
outer housing 110 may include anend wall 112. Together theshelf area 158 and theend wall 112 define a space for theoverload spring 140. As such, during loading, both theend wall 112 and theshelf area 158 may provide a compression force on theoverload spring 140 as theshelf area 158 is pulled towards theend wall 112. -
FIGS. 5A, 5B, and 5C are perspective, side, and cross-sectional views of thecam 120. The cam includes aside wall 520 including an inward facinginterior surface 522 and an outward facingexterior surface 524. Thecam 120 may include a plurality ofgrooves interior surface 522. As thecam 120 has a cylindrical shape, each of the grooves may be annular grooves that extend 360 degrees around theinterior surface 522. - In addition, each
groove FIG. 6 is a perspective view of anexample seal 600.Seal 600 may be a sealing O-ring made of rubber, plastics, silicone, etc. and sized to provide an air and fluid tight barrier between the cam and the inner slide during typical or expected operating temperature configurations for the valve. - When configured as
valve 100, thecam 120 is concentric about theinner slide 150. Returning toFIG. 2 , when seals, such as seal 600 (not shown for ease of viewing and understanding), are arranged within each of the threegrooves inner slide 150, the seals and grooves together may form first andsecond compartments cam 120 and theinner slide 150. For instance, afirst seal 600 ingroove 122 and a second seal ingroove 124 may formcompartment 160 between thecam 120 and theinner slide 150. Thesecond seal 600 ingroove 124 and athird seal 600 ingroove 126 may for thecompartment 162 between thecam 120 and theinner slide 150. Accordingly, when in the closed or locked configuration, the second seal withingroove 154 prevents fluid from passing between theinlet 154 and theoutlet 152 via the openings - When the
valve 100 is in the closed or locked configuration, thefirst compartment 160 may be in fluid communication with thefirst opening 352 in theinlet 154 and thesecond compartment 162 may be in fluid communication with thesecond opening 354 in theoutlet 152. In this configuration, the seal withingroove 124 may prevent fluid from passing between the first and second compartments. When thevalve 100 is in the unlocked or open configuration, thesecond compartment 162 may be in fluid communication with both thefirst opening 352 and thesecond opening 354. In this configuration, fluid is able to pass from theinlet 154 to theoutlet 152 by way of thesecond compartment 162. -
FIG. 7 depicts thecam 120 andinner slide 150 when the valve is in the closed or locked configuration. As shown, each of thecam 120 and theinner slide 150 may include arespective pin respective slot cam 120,cam pin 720, and slot 722 are shown as transparent (dashed line) and theseals 600 are not shown inFIG. 7 . Theslot 722 in thecam 120 may extend partially into (i.e. as a groove) or completely through (i.e. as a hole) theside wall 520 of thecam 120. - The
cam pin 720 extends into theslot 752 of the inner slide, and theinner slide pin 750 extends into theslot 722 of thecam 120. Each of the pins may be sized (length and width) to be able to slide within the corresponding slots. For instance,cam pin 720 may be sized to slide withinslot 752 of theinner slide 150, andinner slide pin 750 may be sized to slide within theslot 722 of thecam 120. In this regard, the shape of each slot defines the path of the corresponding pin in that slot. Each slot has a respectivefirst slot portion second slot portion FIG. 5 ), 02 (FIG. 7 ) relative to one another in a “check” (less than a 90 degree angle) or “L” (at or approximately a 90 degree angle) shape corresponding to a “check mark” or “L” shaped path for the corresponding pin in that slot. - During loading, when the grabbing
mechanism 30 is attached to a load, such asobject 40, and the movingmechanism 10 begins to attempt to move the object, the object will provide a pulling/resistance force at the outlet end of theinner slide 150. At the same time, movingmechanism 30 will provide a pulling force at the inlet end of theinner slide 150. This will cause theinner slide 150, including theshelf area 158, to move towards theobject 40. As theinner slide 150 is pulled towards theobject 40, theinner slide pin 750 may move within and follow the shape of thefirst slot portion 724 of theslot 722 of thecam 120. - The
overload spring 140 may slow or limit this movement of thecam pin 720 within theslot 752 of theinner slide 150 depending upon the pulling/resistance force provided by theobject 40. How much theoverload spring 140 is able to limit this movement may be a direct result of the sizing or spring force constant of the overload spring. In other words, the sizing of the overload spring may define a load on thevalve 100 which will cause the valve to open. For instance, if the pulling/resistance force provided by theobject 40 is very small relative to the sizing of theoverload spring 140, theoverload spring 140 may completely prevent theinner slide pin 750 from moving within thefirst slot portion 724 of theslot 722 of thecam 120. As the pulling/resistance is increased relative to the sizing of theoverload spring 140, the amount of movement of theinner slide pin 750 within and along thefirst slot portion 724 of theslot 722 of thecam 120 will increase. - Movement of the
inner slide pin 750 within and along thefirst slot portion 724 of theslot 722 in combination with the shape of thefirst slot portion 724 of theslot 722 of the cam, may cause thecam 120 to rotate.Arrow 800 ofFIG. 8A indicates the direction of the rotation of thecam 120. Again, for ease of viewing and understanding, thecam 120,cam pin 720, and slot 722 are shown as transparent (dashed line) and theseals 600 are not shown inFIG. 8A . This rotation of thecam 120 may cause thecam pin 720 to slide withinfirst slot portion 754 of theslot 752 of theinner slide 150. - Eventually, the
cam pin 720 andinner slide pin 750 will align with thesecond slot portions slots inner slide 150 andcam 120, respectively, as shown in the example ofFIG. 8B . Again, for ease of viewing and understanding, thecam 120,cam pin 720, and slot 722 are shown as transparent (dashed line) and theseals 600 are not shown inFIG. 8B . - At this point, the pulling/resistance of the
object 40 will pull theinner slide pin 750 along thesecond slot portion 726 of theslot 722 of thecam 120 as shown inFIG. 9 . Again, for ease of viewing and understanding, thecam 120,cam pin 720, and slot 722 are shown as transparent (dashed line) and theseals 600 are not shown inFIG. 9 . At the same time, thecam actuation spring 130 will expand and push thecam 120 away from theshelf area 158 causing thecam pin 720 to move along thesecond slot portion 756 of theslot 752 of theinner slide 150. - As can be seen from
FIGS. 9 and 10 , the movement of the cam away from the object will reposition theseals 600 and relative to the inner slide such that the first and second openings will each be within the second compartment thereby unlocking the valve and allowing fluid to pass from the inlet to the outlet. In this regard,FIG. 10 is a cross sectional view of thevalve 100, again without theseals 600 for ease of viewing and understanding, with the valve in the open or unlocked configuration. - In this configuration, fluid from the fluid source may then pass to the grabbing mechanism causing the grabbing mechanism to automatically release the object, pneumatically or hydraulically.
FIG. 11 corresponds to the view ofFIG. 10 highlighting an example path 1100 (including path portions 1110-1160) of fluid as it moves from the inlet end to the outlet end of thevalve 100 when the valve is in the open or unlocked configuration. For instance, fluid from the pressurizedfluid source 20 enters the inlet alongpath portion 1110, passes from the inlet into the inlet opening alongpath portion 1120, passes from the inlet opening into the second compartment alongpath portion 1130, passes from the second compartment into the outlet opening alongpath portion 1140, passes from the outlet opening into the outlet alongpath portion 1150, and passes to the grabbingmechanism 30 from the outlet alongpath portion 1160. Once the fluid reaches the grabbingmechanism 30, the fluid may cause the grabbing mechanism to automatically release theobject 40, thereby allowing a fast release of the object, preventing an overload ofsystem 1, and preventing damage to the system as well as any nearby objects or human operators. - Most of the foregoing alternative examples are not mutually exclusive, but may be implemented in various combinations to achieve unique advantages. As these and other variations and combinations of the features discussed above can be utilized without departing from the subject matter defined by the claims, the foregoing description of the embodiments should be taken by way of illustration rather than by way of limitation of the subject matter defined by the claims. In addition, the provision of the examples described herein, as well as clauses phrased as “such as,” “including” and the like, should not be interpreted as limiting the subject matter of the claims to the specific examples; rather, the examples are intended to illustrate only one of many possible embodiments. Further, the same reference numbers in different drawings can identify the same or similar elements.
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US16/995,087 US20200378524A1 (en) | 2018-03-02 | 2020-08-17 | Overload protection valve |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US15/910,198 US10794513B2 (en) | 2018-03-02 | 2018-03-02 | Overload protection valve |
US16/995,087 US20200378524A1 (en) | 2018-03-02 | 2020-08-17 | Overload protection valve |
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US15/910,198 Continuation US10794513B2 (en) | 2018-03-02 | 2018-03-02 | Overload protection valve |
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US20200378524A1 true US20200378524A1 (en) | 2020-12-03 |
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US16/995,087 Abandoned US20200378524A1 (en) | 2018-03-02 | 2020-08-17 | Overload protection valve |
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US15/910,198 Active 2038-10-12 US10794513B2 (en) | 2018-03-02 | 2018-03-02 | Overload protection valve |
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EP (1) | EP3737881A4 (en) |
KR (1) | KR102219626B1 (en) |
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Family Cites Families (17)
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US3205863A (en) | 1953-12-29 | 1965-09-14 | Parker Pen Co | Writing instrument |
US3298481A (en) | 1963-07-10 | 1967-01-17 | Chicago Pneumatic Tool Co | Torque release and shut off device for rotary pneumatic tools |
US3385377A (en) | 1966-07-07 | 1968-05-28 | Chicago Pneumatic Tool Co | Governor controlled nut-runner |
JPS5039965U (en) * | 1973-08-09 | 1975-04-23 | ||
US4187763A (en) | 1978-03-31 | 1980-02-12 | Gould Inc. | Overload relief valve |
US4221238A (en) * | 1978-07-07 | 1980-09-09 | Forest Medical Products, Inc. | Linearly operable intermittent valve |
JPS5624274A (en) | 1979-08-04 | 1981-03-07 | S N Seiki:Kk | Speed reduction device used for opening and closing valve |
US4632361A (en) * | 1983-01-26 | 1986-12-30 | Callison & Associates Limited Partnership | Scheduled fluid control valve |
FR2556065B1 (en) * | 1983-12-01 | 1986-09-12 | Alsthom Atlantique | MECHANICAL CONNECTION DEVICE |
US5531408A (en) | 1993-10-07 | 1996-07-02 | Chemetron-Railway Products, Inc. | Railroad switch stand |
JPH08158840A (en) | 1994-12-05 | 1996-06-18 | Suzuki Motor Corp | Lubricating device for internal combustion engine |
KR100499285B1 (en) | 1998-09-30 | 2006-07-25 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Pilot Switching Valve of Hydraulic System for Civil Construction Machinery |
CN101403398A (en) * | 2008-11-14 | 2009-04-08 | 天津玖丰重工机械有限公司 | Hydraulic multichannel conversion valve |
JP2010208192A (en) | 2009-03-11 | 2010-09-24 | Bridgestone Corp | Sealing pump-up device and sealing pump-up method |
US8272445B2 (en) * | 2009-07-15 | 2012-09-25 | Baker Hughes Incorporated | Tubular valve system and method |
CN103615581B (en) * | 2013-12-04 | 2016-08-03 | 西安飞行自动控制研究所 | A kind of overload protective valve of hydraulic actuator |
CN103775438B (en) * | 2013-12-31 | 2016-09-14 | 江苏南铸科技股份有限公司 | Overload protection valve and the overload valve containing overload protection valve |
-
2018
- 2018-03-02 US US15/910,198 patent/US10794513B2/en active Active
-
2019
- 2019-02-28 EP EP19760398.8A patent/EP3737881A4/en not_active Withdrawn
- 2019-02-28 CN CN201980016888.9A patent/CN111868424A/en active Pending
- 2019-02-28 KR KR1020207024974A patent/KR102219626B1/en active IP Right Grant
- 2019-02-28 AU AU2019227831A patent/AU2019227831B2/en not_active Ceased
- 2019-02-28 WO PCT/US2019/019971 patent/WO2019169083A1/en unknown
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2020
- 2020-08-17 US US16/995,087 patent/US20200378524A1/en not_active Abandoned
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KR102219626B1 (en) | 2021-02-23 |
EP3737881A1 (en) | 2020-11-18 |
AU2019227831B2 (en) | 2020-11-05 |
CN111868424A (en) | 2020-10-30 |
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