MXPA97002879A - A system of hydraulic circuit for a cat of a touch and its structure - Google Patents

Abstract

The present invention relates to a one-touch jack, characterized in that it comprises a) a hydraulic cylinder having a movable piston rod extending therefrom with a portion of the piston rod located in an internal chamber of the hydraulic cylinder, the piston rod has an internal oil chamber in it, the hydraulic cylinder has an external reservoir, b) a pump that has a pump oil chamber and a piston that moves in and out of the oil chamber of the pump, a volume of the oil chamber of the pump being at least as large as a volume of the internal oil chamber of the piston rod, c) an oil inlet circuit comprising a first oil channel that is extends between the pump chamber and the external reservoir, a first check valve that is located in the first oil channel in a manner that allows hydraulic flow from the external reservoir to the chamber pump oil and prevents flow in the opposite direction, a second oil channel that extends between the oil chamber of the pump and the internal oil chamber of the piston rod, a second check valve that is located in the second oil channel to allow hydraulic flow from the oil chamber of the pump to the internal oil chamber of the piston rod when the piston moves inside the oil chamber of the pump, and to avoid flow in the opposite direction; a third oil channel that extends between the external tank and the internal chamber, a third check valve that is located in the third oil channel to allow hydraulic flow from the external tank to the internal chamber and to avoid flow in the direction opposite, and a fourth oil channel extending between the internal chamber and the second oil channel in front of the second check valve, a sequence valve that is locates in the oil channel by closing the fourth oil channel until a predetermined pressure is reached in the second oil channel, the sequence valve opens to the predetermined pressure to allow hydraulic flow from the second oil channel to the internal chamber , the sequence valve comprises i) a hollow post threadably connected to the hydraulic cylinder in the fourth oil channel, ii) a first conical valve element, and iii) a spring supported against the hollow post and the first conical valve element deflecting the first conical valve element towards a closed position, by means of a predetermined opening pressure can be adjusted by rotating the hollow post to move the hollow post towards or in housing of the first conical valve element to vary the spring deflection force; and, d) an oil return circuit comprising a fifth oil channel extending between the external reservoir and the fourth oil channel in a location between the hollow post and the conical valve element, the fifth oil channel also in communication with the internal internal oil chamber of the piston rod, a discharge valve located in the fifth channel of oil to selectively open or close the fifth oil channel

Description

ÜN SYSTEM DF HYDRAULIC CIRCUIT FOR A GOTO OF A POSO AND ITS STRUCTURE BACKGROUND OF INVENTION 5 (a) Field of the Invention The present invention relates to a hydraulic circuit system for a cat and s? structure, particula menu system and hydraulic circuit structure that can have a piston lift to lift a lifting arm and support plate to a loading position to support and lift a load in "one step" for a individual operation of a manual pump to a condition without load or light load. (h) Description of the Prior Art Conventionally, a hydraulic jack comprises? 0 mainly a manual pump, a hydraulic cylinder with internal and external reservoirs, a piston rod, a relief valve, a safety valve and a related LCO hydraulic circuit. The outer end of the piston rod is linked to a lifting arm and support plate. However, in a conventional structure as such, an oscillator or handle is generally repeatedly pulled and pushed to pump hydraulic fluid to drive the piston rod to lift upward and thereby support and lift a load gradually. In the conventional structure of a jack, the oscillator or handle can be operated repeatedly in either no load or light load condition to pump enough hydraulic fluid to operate the hydraulic cylinder and lift the piston rod to lift the lift arm and consequently the support plate at a very slow speed. The same speed occurs even when there is no charge for the cat, or even when the light is very clear. It is a time and labor consuming procedure, and can not be lifted immediately to respond to the need promptly when there is an emergency such as for rescue purposes in an accident where heavy weight is involved.

BRIEF DESCRIPTION OF THE INVENTION The main objective of the present invention is to provide a hydraulic circuit system for a one-way jack and its structure comprises mainly an input circuit, a return circuit and an overload protection circuit where the input circuit is It extends from an external reservoir of a hydraulic cylinder by means of a check valve to connect to an oil chamber of a manual pump, while the oil chamber of the pump is connected to an internal chamber of the oil in the piston rod by means of another check valve, the oil chamber of the pump is connected to an internal tank of the hydraulic cylinder by means of a sequence valve, and the internal tank is connected to the external tank by means of a v check valve When the maximum effective capacity of the oil chamber of the pump is greater than or equal to the internal oil chamber of the piston rod, the inlet circuit can provide hydraulics from the pump by means of a guide channel. oil to the internal oil chamber of the piston rod to drive the piston promptly, while the volume of hydraulic fluid in the oil chamber of the pump is greater than that in the internal chamber of the piston rod, the Piston rod and jack can reach the desired loading position in one step. In this way, the slow speed in the operation and the lifting of the conventional jack is eliminated, therefore, work efficiency can be improved. Another objective of the present invention is to provide a hydraulic circuit system for a one-step jack and its structure having a pump, a relief valve, a sequence valve and a safety valve in the rear block of the cylinder. hydraulic, in particular an internal oil chamber in the piston rod where an oil guide tube can be inserted while another tube of the guide tube can be inserted. Oil is secured to the rear block of the hydraulic cylinder and the oil guide tube is connected to an oil channel of the oil pump that the hydraulic fluid in the oil chamber of the pump can enter the internal oil chamber of the piston rod by means of the oil guide tube to push the piston into the desired position in one step when the volume of hydraulic fluid in the oil chamber of the pump is greater than that in the internal oil chamber of the pump. piston rod. Another objective of the invention is to provide a hydraulic circuit system for a one-step jack and its structure where the oil chamber of the pump is designed with an oil channel to connect the oil guide tube by means of a check valve. The oil channel passes through a safety valve and a relief valve in order. The oil channel of the safety valve has two branches that connect to the internal and external reservoirs of the hydraulic cylinder, respectively, and has a check valve between said two branches to prevent flow of hydraulic fluid from the oil chamber of the pump to the internal and external reservoirs. The internal reservoir has a sequence valve to connect to the safety valve. Said relief valve is connected to the internal and external tanks, respectively, and has an oil guide channel to pass through the sequence valve so that the hydraulic fluid can flow from the internal tank to the external tank.

BRIEF DESCRIPTION OF THE DRAWINGS The invention, as well as its various advantages, can be understood by means of the following detailed description and the drawings in which: Figure 1 illustrates a hydraulic circuit system in accordance with the present invention; Figure 2 is a cross-sectional view of the cat structure according to the present invention; Figure 3 illustrates the displacement of the piston rod to its loading position in step; Figure 4 further illustrates the lifting of the piston rod to support a load; Figure 5 illustrates the displacement of the lifting arm and the support plate by means of the action of the piston rod from its motionless position to a fully evacuated position; Figure 6 is a sectional view of the sequence valve according to the present invention; Figure 7 is an exploded perspective view of the safety valve in accordance with the present invention; and Figure 8 is a diagram showing the perspective relief of the relief valve in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES As shown in Figure 1, the subject of hydraulic circuit for a one-step jack in accordance with the present invention, comprises primarily an input circuit, a return circuit and an overload protection circuit together with a cylinder. hydraulic 10 with an internal tank l,? n external tank 2, a pump oil chamber J), and a piston rod 4 with an internal oil chamber 41 as well as other components in a configuration shown in figure 2 The input circuit extends from the external reservoir 2 of the hydraulic cylinder 10 by means of a check valve Al to the pump oil chamber 3, and then by means of another check valve 02 to an internal chamber. of oil 41 of the piston rod 4. Said pump oil chamber 3 is connected to the internal tank 1 of the hydraulic cylinder 10 by means of a sequence valve B. Said external tank 2 is connected to the depo internal site 1 of the hydraulic cylinder 10 by means of a check valve A3. Therefore, in a no-load or light-load condition, the input circuit can supply hydraulic fluid in sequence via the pump oil chamber 3 to the internal oil chamber 41 of the piston rod 4 for driving piston 4 immediately. The return circuit extends from the internal reservoir 1 of the hydraulic cylinder 10 to the internal oil chamber 41 of the piston rod 4 by means of a check valve A4, and then passes through a relief valve C for connect to the external tank 2. After discharge, the relief valve C can be regulated to a relief condition to make the return circuit in open condition recover s? original position. The overload protection circuit is < - > . < t from the external tank 2 of the hydraulic cylinder 10 by means of a safety valve ü to be connected to the pump oil chamber 3. When the pressure of the hydraulic cylinder 10 is greater than the assigned pressure, the safety valve D is open to activate the overload protection circuit immediately. With the aforementioned hydraulic circuit, particularly when the ratio of the maximum effective capacity of the pump oil chamber 3 to the maximum effective capacity of the internal oil chamber 3 of the piston rod 4 is greater than or equal to one , the hydraulic jack can be Lifted to the load condition required by a step in a no load or light load condition. As shown in FIG. 2, one embodiment of the aforementioned hydraulic circuit design for the jack comprises mainly a cylinder 10 and a piston rod 4. The hydraulic cylinder 10 is composed of an extruder cylinder body 101 and a cylinder body. internal cylinder L02. It has a front l 103 block on the front end, and a rear block 104 at the rear end. The hydraulic cylinder 10 has an internal tank 1 and an external tank? that are separated from each other. In the back block, a pump 20, a sequence valve B, a relief valve C and a safety valve D are placed in coupling with the hydraulic circuit described above- "The piston rod 4 is placed inside the internal reservoir 1 of the hydraulic cylinder 10. It can be displaced by means of hydraulic action to raise or lower a lifting arm 30 and the upper plate 40 of the jack. In addition, it has an inner oil chamber 41 inside its bar body so that an oil guide tube 50 can be inserted into the inner oil chamber 41 of the piston rod 4, while an extr-emo The oil guide tube 50 is secured to the rear block 104 of the hydraulic cylinder 10, and is connected to the oil channel 31 of the pump oil chamber 3 so that the hydraulic fluid in the pump oil chamber 3 it can enter the inner oil chamber 41 of the piston rod 4 by means of the oil guide tube 50 to lift the piston bale 4. The aforementioned pump 20 comprises a traction block 201, a plunger 202 and a oscillator 204 fixed by a locking pin 203. By means of movement up and down the oscillator 204, the hydraulic fluid in the oil chamber 3 can circulate. The pump oil chamber 3 has an oil channel 31 to be connected to said oil guide tube 50 by means of the check valve A ?, and the oil channel 31 passes through the safety valve D and the oil channels DI and Cl of the relief valve in order., the safety valve D has an oil channel with two channels of bi-ling oil DI 1 and DI 2 to be connected to the internal tank 1 and the external deposit? of the hydraulic cylinder 10, respectively. Between the branch oil channels Dll and D12, there are check valves A3 and A to prevent the entry of hydraulic fluid from the pump oil chamber 3 into the internal and external reservoirs 1 and 2. Internal reservoir 1 is incorporated with a sequence valve B to connect to the oil channel DI of the safety valve D. Said relief valve C is connected to the external tank 2 and the internal tank L respectively, and has a channel of oil guide cl to pass through the sequence valve B so that the hydraulic fluid from the internal reservoir l can be returned to the external reservoir 2 directly through the oil guide channel Cl having a check valve A4 to prevent flow of the fluid. hydraulic fluid from the pump oil chamber 3 to the internal tank L. With the aforementioned hydraulic circuit design, when the jack is in the no-load or light-load condition, an indivi dual of the oscillator 204 can lift the plunger 202 of the pump 20 to the upper position-to apply a pulling force so that the hydraulic fluid can flow through the oil channel 31 of the pump oil chamber 3, the oil guide tube 50 and internal piston chamber 41 of a piston rod 4 in sequence to drive the piston rod 4, and, since the volume of hydraulic fluid in the pump oil chamber 3 is greater than or equal to the volume of hydraulic fluid n the internal oil chamber 41 of the piston rod 4, the piston rod 4 of the jack is lifted to the required loading position in one step, as shown in the figure 3. While the aforementioned hydraulic circuit is not in the sn load or light load condition, when the piston rod 4 is displaced forward, since the pressure in the internal reservoir 1 of the hydraulic cylinder 10 will suddenly , the hydraulic fluid flows from the external tank erno 2 by means of the oil channel D12 to replace the internal tank 1 automatically, and another hydraulic fluid flow can go to the pump oil chamber 3 via the oil channel DI for another operation of the pump 20. Then, the hydraulic fluid can not enter from the internal oil chamber 41 completely filled with water. The piston rod 4, and in this way, the pressure is reached to open the flow valve B. Therefore, the hydraulic fluid flows into the internal tank L from the oil channel 31 of the oil tank. pump 3 and the oil channel of the sequence B so that the piston rod 4 continues to hold and raise the ca to U upwards, as shown in figure 4. In this aspect, the sequence valve 33 can be-adjusted with an opening pressure. Similarly, the aforementioned safety valve D can be adjusted with an opening pressure so that the safety valve D is opened when the piston rod 4 reaches its upper load limit or an overload is applied. In this case, the hydraulic fluid flows in the external reservoir? from the pump oil chamber 3 by means of the safety valve D directly, and then it returns to the pump oil chamber 3 via the oil channel Ü12 to form a safety circuit which restricts the flow of the oil. hydraulic fluid in the internal tank l. When secured, the aforementioned relief valve C must prevent the return of the hydraulic fluid to the external tank 2 when the jack is used to maintain a load. However, after use it must be properly loosened so that the hydraulic fluid in the inner oil chamber 41 of the piston rod 4 and the inner tank L can return to the external tank 2, and, simultaneously, the hydraulic fluid only it can flow from the pump oil chamber 3 to the external tank 2 by means of the check valve C to repeat the same circulation without driving the piston rod 4. Figure 5 illustrates the displacement of the lifting arm 30 and the cat support plate 40 from a stationary position to reach the load U in one step and consequently to lift the load U. Co or described above, the sequence valve B can be preset for an opening pressure during the assembly of the cat according to the present invention. Therefore it can be designed according to the user's final real need to ensure that the opening pressure can meet different requirements. As shown in Figure 6, the sequence valve comprises mainly a hollow spiral post Bl, a retraction spring B2 and a conical valve B3 and is designed so that it can be placed inside an oil channel B4 that connects the oil channel DI of the safety valve D. The hollow spiral pole Bl is fixed to the outlet of the oil channel B4, and the valve c mea B3 is placed to block a gap of the conical valve with the Retraction spring B2 fixed between the hollow spiral pole Bl and the comea valve B3. The retraction spring B2 is compressed by the hollow spiral post Bl to a different degree for different opening pressure setting. Similarly, as shown in Figure 7, the safety valve D in accordance with the present invention has substantially equal construction with the sequence valve B. It comprises a spiral pole D2, a spring retraction D3 a conical valve D4. the safety valve T) is placed in a DI oil channel. The retraction spring D3 is compressed by the spiral post D2 to a different degree by the different aperture pressure setting. However, there is no hydraulic fluid to pass through the spiral pole D2, therefore, a solid spiral pole 1) 2 is used. The relief valve C according to the present invention comprises mainly a return gear and a return valve rod C3, as shown in FIG. 8. The return gear 02 is designed with a fixing hole C21 in its center. The return valve bar C3 is a stepped bar structure with a small annular rib C31 at its front end to fix the fixing hole * C21 in the center of the return gear 02, two stepped annular ribs 032 and C33 in their middle section and a threaded section C35 of appropriate length in the lower section. An annular groove C34 is formed between the stepped annular ribs 032 and C33 to hold an oil seal. The threaded section C35 has a pin extension at the end 036 where a declined passage C37 is formed. Of course, many changes and modifications in the above embodiment of the invention can be carried out without departing from the scope thereof. Accordingly, to promote progress in science and useful techniques, the invention is described and should be limited only by the scope of the appended claims.

Claims (1)

NOVELTY PE Lfl INVENTION CLAIMS

1. - A hydraulic circuit system for a one-step jack and its structure that comprises an interconnected circuit, a return circuit and a protection circuit overload it together with a hydraulic cylinder that has an internal tank , an external tank, a pump chamber, and a piston rod with an internal oil chamber as well as other components, where: the input circuit extends from the external tank of the hydraulic cylinder by means of a valve retention to the pump oil chamber, and then by means of another check valve to an internal piston rod oil chamber, wherein said pump oil chamber is connected to the internal reservoir of the hydraulic cylinder by means of a sequence valve, said external reservoir is connected to the internal reservoir of the hydraulic cylinder by means of a check valve so that in a no load or light load condition, the Entr-ada can supply hydraulic fluid in sequence by means of the pump oil chamber to the internal oil chamber of the piston rod to drive the piston rod immediately; the return circuit extends from the internal reservoir of the hydraulic cylinder to the internal oil chamber of the piston rod by means of a check valve, and then passes through a relief valve to connect to the external reservoir, for after unloading it recovers its original position, the relief valve can be adjusted to the relief condition to make the inlet circuit in the opening condition; and the overload protection circuit extends from the external reservoir of the hydraulic cylinder by means of a safety valve to be connected to the pump oil chamber so that when the pressure of the hydraulic cylinder is greater than a pressure assigned, the safety valve opens p *, to activate the overload protection circuit immediately; where, particularly when the ratio of the maximum effective capacity of the pump chamber to the maximum effective capacity of the inner piston rod oil chamber is greater than or equal to one, the hydraulic jack can be raised to the load condition required by a step in the no load or load condition l gera. ? .- A hydraulic circuit system for a one-step jack and its structure according to claim 1, further characterized in that the jack comprises mainly a hydraulic cylinder and a piston rod, wherein: the hydraulic cylinder is composed of an external cylinder body and an internal cylinder body, having a front block at the end rontaJ, a rear block at the rear end, an internal tank and an external tank that are separated from each other, a pump, a valve of sequence, a relief valve and a safety valve in the rear block - and placed in coupling with said hydraulic cylinder; The piston rod is placed inside the hydraulic cylinder reservoir, and can be displaced by hydraulic means to raise or lower the lifting arm and the upper plate of the jack, which has an internal chamber. of oil inside its bar body in such a way that an oil guide tube can be inserted into the internal oil chamber, while one end of the oil guide tube is secured to the rear block of the hydraulic cylinder and is connected to an oil channel of the pump oil chamber so that the hydraulic fluid (in the pump oil chamber can enter the internal oil chamber of the piston rod by means of the oil guide tube for lifting the piston rod, said pump oil chamber having an oil channel for connecting said oil guide tube by means of a check valve, the oil channel passing through the safety valve and the oil channels of the valve relief vula in order, the safety valve has two bifurcation oil channels (they are connected to the internal tank and to the external tank of the hydraulic cylinder, respectively, while entering the bifurcation oil channels there is a check valve to prevent that in the hydraulic fluid from the oil chamber of the pump to the internal and external tanks, the internal tank is incorporated with a sequence valve to connect to the oil channel of the safety valve, said relief valve is connected to the tank external and internal reservoir, respectively, and has an oil guide channel to pass through the sequence valve so that the hydraulic fluid from the internal reservoir can return to the external reservoir directly through the oil guide channel which has a check valve to prevent the flow of hydraulic fluid from the pump oil chamber to the internal tank, and the bar The piston can be lifted to the top part in one step when the volume of hydraulic fluid in the pump oil chamber is greater than or equal to at least the volume of hydraulic fluid in the internal oil chamber of the pump bar. piston. 3.- A hydraulic circuit system for a one-step jack and its structure according to claim 1 or 3, further characterized in that the sequence valve comprises mainly a hollow spiral pole, a retraction spring and a valve It is designed so that it can be placed inside an oil channel that is connected to the oil channel of the safety valve, in such a way that the hollow spiral po-s is fixed at the outlet of the valve. Oil channel and conical valve is positioned to block a valve hole conca with the retraction spring fixed between the hollow spiral pole and the conical valve so that the retraction spring is compressed by the hollow spiral pole in? n different degree for the adjustment of 'í Different opening pressure, by the way, when the piston rod is displaced forward, since the hydraulic cylinder internal reservoir suddenly drops, the hydraulic fluid flows from the extruded reservoir through the channel of oil to replace the internal tank automatically; Afterwards, the hydraulic fluid can not enter from the oil chamber completely filled with the piston casing, the hydraulic fluid flows in the internal reservoir from the oil channel of the pump oil chamber and the oil channel of the sequence so that the piston rod can continue to hold and lift the load upwards. 4. A hydraulic circuit system for a one-step jack and its structure according to claim 1 or 2, further characterized in that the safety valve comprises a solid spiral post, a retraction spring and a valve comea , and is placed in an oil channel with the retraction resor e compressed by the spiral post to a different degree for the differential opening pressure setting. 5. A hydraulic circuit system for a one-step jack and its structure according to claim 1 or 2, characterized in addition to the relief valve mainly a return gear and a return valve rod, wherein the return gear is designed with a fixing hole at its center, and the check valve bar is not a stepped bar structure with a small annular rib? its front end to fix the anvil hole in the center of the return gear, having two annular ribs staggered in its middle section and a threaded section of appropriate length in the lower section, an annular groove between the stepped annular ribs to hold an oil seal, and the section threaded having an extension with a pin at the end where a declined passage will be formed.