Hydraulic-driven bench press

Abstract

To provide a hydraulic-driven bench press which does not require a replacement of weight and which can reproduce the training contents used in a mechanical bench press.SOLUTION: A hydraulic-driven bench press 1 includes: a gate-type frame 2 having a pair of standing support pillars 21; a pair of guide bars 3 each arranged along the longitudinal direction of the support pillar; a slide unit 4 provided between the pair of guide bars and which can slide in a vertical direction along the pair of guide bars; and a hydraulic cylinder 5 which applies a load on the slide unit. The slide unit includes: a pair of slide blocks 41 which slides on the guide bar; a grip bar 42 provided between the pair of side blocks; and a connection bar 43 provided between the pair of slide blocks above the grip bar. The hydraulic cylinder applies a download load to the slide unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hydraulically powered bench press. [Background technology]

[0002] Bench presses have been used for muscle training and health maintenance for a long time. These bench presses are usually mechanical, and use a barbell with disks (circular flat weights) attached to both ends of the bar. The user lies face-up on the bench of a bench press table and repeatedly raises and lowers the barbell held in the palms of both hands, thereby training the upper arm muscles, chest muscles, abdominal muscles, etc.

[0003] Here, when changing the weight of the barbell, this is done by reattaching disks of different weights to both ends of the bar, but this disk replacement work is tedious, and it is not easy for elderly women who are not very strong to perform the work, and there is also the problem of the disks being dropped.

[0004] In recent years, bench presses have been developed that have a throttle load cylinder that can change the load hydraulically. This hydraulic bench press allows the output (load applied to the user) to be changed by adjusting the throttle opening of the throttle load cylinder. In the case of a bench press with such a throttle load cylinder, the output F (load applied to the user) is F = ΔP × A (ΔP is the pressure difference before and after the throttle; A is the effective area of ​​the cylinder piston) as shown in Figure 12, and the relationship between the pressure difference ΔP and the flow rate Q is given by the Hagen-Poiseuille equation: Q = πd 4 ΔP / 128μL (d: aperture diameter) (μ: liquid viscosity) (L: Aperture length) Therefore, the output F is affected by ΔP, and therefore the flow rate (the speed of the cylinder piston) and the aperture d, so it is not a linear proportional equation, and the output during operation is not constant, so there is a problem that it is difficult to grasp the accurate output value by adjusting the aperture only. In addition, in the case of a bench press with a pressure load cylinder, the output value generated by the reciprocating movement of the cylinder piston is the same value for both reciprocations, so the same load is applied in both pushing and pulling directions, and in the case of a mechanical bench press, the muscle parts and load trained when lifting the barbell (when pushing) and the muscle parts and load trained when lowering it (when pulling) are significantly different. In other words, there is a problem that the training content using a mechanical bench press cannot be reproduced with a bench press with a pressure load cylinder. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made to solve such problems, and has as its object to provide a hydraulically driven bench press that does not require replacement of weights and can reproduce the training content using a mechanical bench press. [Means for solving the problem]

[0006] The object of the present invention is achieved by a hydraulically driven bench press comprising: a portal frame having a pair of upright pillars; a pair of guide bars respectively arranged along the longitudinal direction of each of the pillars; a slide unit arranged between the pair of guide bars and capable of sliding up and down along the pair of guide bars; and a hydraulic cylinder for applying a load to the slide unit, wherein the slide unit comprises a pair of slide blocks sliding on each of the guide bars, a grip bar arranged between the pair of slide blocks, and a connecting bar arranged between the pair of slide blocks above the grip bar, and the hydraulic cylinder applies a load downward to the slide unit.

[0007] Furthermore, with regard to this hydraulically driven bench press, the above-mentioned object is achieved by a hydraulically driven bench press characterized in that the hydraulic cylinder is configured to be switchable between a first operating mode in which a load is applied to the downward side of the slide unit and a second operating mode in which a load is applied to the upward side.

[0008] It is also preferable that the hydraulic cylinder is disposed along one of the pillars and applies a load to one side of the slide unit.

[0009] It is also preferable that both ends of the grip bar are connected to the lower end side of the slide block, both ends of the connecting bar are connected to the upper end side of the slide block, and the slide unit is formed in a U-shape when viewed from the front.

[0010] Moreover, it is preferable that the ratio (H / L×100%) of the vertical dimension H to the horizontal dimension L of the slide unit is 20% or more.

[0011] The slide unit further includes a plate body disposed on one of the slide blocks, It is preferable that the plate body has a protrusion that protrudes horizontally outward from one of the slide blocks, the tip end of the piston rod of the hydraulic cylinder is connected to the protrusion, and the load applied by the hydraulic cylinder acts on the slide unit via the protrusion. Effect of the Invention

[0012] According to the present invention, it is possible to provide a hydraulically driven bench press that does not require replacement of weights and can reproduce the training content using a mechanical bench press. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of a hydraulically powered bench press according to the present invention; [Diagram 2] FIG. 2 is an enlarged front view of a main portion of the hydraulically driven bench press according to the present invention. [Diagram 3] FIG. 2 is an enlarged side view of a main portion of the hydraulically driven bench press according to the present invention. [Figure 4] FIG. 11 is an enlarged side view of a main portion showing a modified example of a hydraulically driven bench press according to the present invention. [Diagram 5] FIG. 2 is an enlarged front view of a main portion of the hydraulically driven bench press according to the present invention. [Figure 6] 1 is an enlarged side view of a main portion of a hydraulically driven bench press according to the present invention. [Figure 7] 1 is an enlarged side view of a main portion of a hydraulically driven bench press according to the present invention. [Figure 8] 1 is an enlarged side view of a main portion of a hydraulically driven bench press according to the present invention. [Figure 9] FIG. 4 is an explanatory diagram for explaining the operation of a hydraulic cylinder provided in the hydraulically driven bench press according to the present invention. [Figure 10] FIG. 4 is an explanatory diagram for explaining the operation of a hydraulic cylinder provided in the hydraulically driven bench press according to the present invention. [Figure 11] FIG. 4 is an explanatory diagram for explaining the operation of a hydraulic cylinder provided in the hydraulically driven bench press according to the present invention. [Figure 12] FIG. 1 is an explanatory diagram for explaining the operation of a conventional bench press having a squeeze load cylinder. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The hydraulically driven bench press according to the present invention will be described below. The present invention is not limited to the following embodiments, and can be modified as appropriate within the scope of the present invention. Each drawing is partially enlarged or reduced in size to facilitate understanding of the configuration. As shown in the perspective view of FIG. 1, the hydraulically driven bench press 1 according to the present invention includes a gate-shaped frame 2, a guide bar 3, a slide unit 4, a hydraulic cylinder 5, and a hydraulic unit 6.

[0015] The portal frame 2 includes a pair of upright support columns 21, a beam member 22 connecting the upper ends of the support columns 21, and a base portion 23 to which the lower ends of the support columns 21 are connected and fixed. Since a bench on which a user lies is disposed between the support columns 21 and the user performs bench press exercise, the support columns 21 are disposed at intervals sufficient to allow the bench to be disposed and for the user to perform normal bench press exercise. It goes without saying that the portal frame 2 is constructed with sufficient strength to prevent it from falling over or being damaged when the user performs bench press exercise. The support columns 21 may be rectangular or cylindrical.

[0016] The guide bars 3 are members disposed along the longitudinal direction (vertical direction) of each of the pillars 21. Each of the guide bars 3 is connected and fixed to the pillars 21 at its upper and lower ends via connecting members 31. A predetermined distance is provided between each of the guide bars 3 and each of the pillars 21.

[0017] As shown in Fig. 1, the enlarged front view of the main part in Fig. 2, and the enlarged side view of the main part in Fig. 3, the slide unit 4 is disposed between the pair of guide bars 3 and configured to be able to slide up and down along the pair of guide bars 3. This slide unit 4 is configured to include a pair of slide blocks 41 that slide on each guide bar 3, a grip bar 42 that is disposed between the pair of slide blocks 41, and a connecting bar 43 that is disposed between the pair of slide blocks 41 above the grip bar 42.

[0018] The slide block 41 is not particularly limited as long as it can slide on the guide bar 3 and can connect the grip bar 42 and the connecting bar 43. For example, a box-shaped structure consisting of a rectangular bottom plate member and wall plate members erected on the four sides of the bottom plate member can be used. When the bottom plate member is installed facing the guide bar 3 (support 21), a through hole is provided in the center of the wall plate member facing upward and downward, and a bearing 44 is installed in the through hole. By inserting the guide bar 3 into the bearing 44 provided in the center of the wall plate member facing upward and downward, the slide block 41 slides up and down on the guide bar 3. The bearing 44 is not particularly limited as long as the slide block 41 can slide up and down on the guide bar 3, but it is preferable to use a linear ball bush. This linear ball bush is a rolling bearing that uses the rolling of a built-in ball to linearly move the slide block 41 on the guide bar 3.

[0019] The grip bar 42 is a member that the user holds in the palms of both hands, and corresponds to the bar in a conventional barbell. Both ends of the grip bar 42 are detachably connected and fixed to each slide block 41 via fixing members 45. The mounting position of the grip bar 42 relative to the slide block 41 is not particularly limited, but it is preferable that the grip bar 42 is connected and fixed to the lower end side of the slide block 41. When the grip bar 42 is connected to the lower end side of the slide block 41, as shown in FIG. 3, a plate body may be provided at the lower end of the slide block 41, and the end of the grip bar 42 may be arranged to hang down below the lower end of the slide block 41 and fixed by the fixing members 45. Alternatively, as shown in FIG. 4, a plate body 46 on which the end of the grip bar 42 can be placed may be provided at the lower end of the slide block 41, and the grip bar 42 may be connected and fixed in a state in which the end of the grip bar 42 is placed on the plate body 46 via the fixing members 45.

[0020] As described above, the connecting bar 43 is a member that is disposed between the pair of slide blocks 41 above the grip bar 42. Both ends of the connecting bar 43 are connected and fixed to the respective slide blocks 41. The attachment position of the connecting bar 43 relative to the slide blocks 41 is not particularly limited, but it is preferable that the connecting bar 43 be connected and fixed to the upper end side of the slide blocks 41. Here, the method of connecting the connecting bar 43 to the slide blocks 41 is not particularly limited, but it is preferable to connect the connecting bar 43 by using fastening members such as bolts and nuts, or by welding.

[0021] From the viewpoint of further increasing the rigidity of the slide unit 4, it is preferable that both ends of the grip bar 42 are connected to the lower end side of the slide block 41, both ends of the connecting bar 43 are connected to the upper end side of the slide block 41, a predetermined gap is provided between the grip bar 42 and the connecting bar 43, and the slide unit 4 is formed in a square shape when viewed from the front. The ratio (H / L×100%) of the vertical dimension H (height dimension H) to the horizontal dimension L (width dimension L) of the slide unit 4 is preferably 20% or more, and more preferably 30% or more.

[0022] A bottom end stopper 7 is provided to determine the bottom end position of the slide unit 4 relative to the guide bar 3. The bottom end stopper 7 is preferably provided on each support 21. The configuration of the bottom end stopper 7 is not particularly limited, but for example, a plate body protruding horizontally outward is provided as the bottom end stopper 7 on the connection member 31 installed on the lower side of the connection members 31 that fix the guide bar 3 to the support 21, and the upper surface side of this plate body (bottom end stopper 7) can be configured to support the grip bar 42. Also, a shock absorbing member 71 made of an elastic member may be provided on the upper surface side of the plate body (bottom end stopper 7), and the upper surface of this shock absorbing member can be configured to support the grip bar 42. By providing such a bottom end stopper 7, it is possible to prevent the grip bar 42 (slide unit 4) from moving downward from the bottom end stopper 7, and to prevent the user from compressing the chest with the guide bar 3 (slide unit 4). Needless to say, the installation position of the bottom end stopper 7 is determined so that, with the slide unit 4 restricted from moving downward by the bottom end stopper 7, the user can lie face up on the bench located below the slide unit 4, and the user can grasp the grip bar 42 in an appropriate position when starting the bench press exercise.

[0023] Also, as shown in Figs. 5 and 6, the intermediate standby pin 8 and the intermediate standby hook 9 may be provided to set the standby position of the slide unit 4 relative to the guide bar 3. Fig. 5 is an enlarged front view of the main part, and Fig. 6 is an enlarged side view of the main part. The intermediate standby pin 8 is arranged to protrude a predetermined distance from the surface facing the inside of one of the supports 21 (the surface facing the other support 21). A plurality of intermediate standby pins 8 are provided at predetermined intervals along the longitudinal direction (up-down direction) of the support 21. The intermediate standby hook 9 is arranged on one end side of the grip bar 42 and is configured to be rotatable around the grip bar 42. With the grip bar 42 (slide unit 4) raised to a predetermined height, the intermediate standby hook 9 is rotated around the grip bar 42 as the rotation center, and its tip is hooked onto the intermediate standby pin 8, thereby holding the grip bar 42 (slide unit 4) at a predetermined height (Fig. 7). The intermediate standby pin 8 and the intermediate standby hook 9 may be provided only on one of the supports 21 and on one end of the grip bar 42, or may be provided on both supports 21 and on both ends of the grip bar 42. The intermediate standby hook 9 and the intermediate standby pin 8 may be engaged with each other on the upper side of the connecting bar 43 as shown in FIG. 7, or may be engaged in the space between the connecting bar 43 and the grip bar 42 as shown in FIG. 8. When the intermediate standby hook 9 is engaged with the intermediate standby pin 8 in the space between the connecting bar 43 and the grip bar 42, the user can visually check the tip of the intermediate standby hook 9 and the intermediate standby pin 8 while engaging them, and the intermediate standby hook 9 can be made lightweight and compact.

[0024] The hydraulic cylinder 5 is a member that applies a load to the slide unit 4, and is connected to the hydraulic unit 6. The hydraulic unit 6 is a device that controls the operation of the hydraulic cylinder 5, and is configured to operate based on a command input via an operation panel. The hydraulic cylinder 5 is configured to be able to switch between a first operation mode in which a load is applied to the lower side of the slide unit 4 and a second operation mode in which a load is applied to the upper side. The hydraulic cylinder 5 is arranged along one of the supports 21, and is configured to apply a load to one side of the slide unit 4. More specifically, as shown in the enlarged view of the main part of FIG. 2, the slide unit 4 includes a plate body 47 arranged on one of the slide blocks 41, and the plate body 47 includes a protruding portion 47a that protrudes horizontally outward from one of the slide blocks 41, and the piston rod tip portion 51 of the hydraulic cylinder 5 is connected and fixed to the lower surface side of the protruding portion 47a, and is configured to apply a load (load application to the upper side and load application to the lower side) by the hydraulic cylinder 5 to the slide unit 4 via the protruding portion 47a.

[0025] Here, in the hydraulically driven bench press 1 according to the present invention, since the slide unit 4 itself has a weight, the load applied by the hydraulic cylinder 5 is configured to be switchable based on the weight W of the slide unit 4 itself. When bench press exercise is performed under a load condition equal to or greater than the weight W of the slide unit 4 itself, the load applied by the hydraulic cylinder 5 is set to be on the lower side, and the load F applied to the user (load equivalent to the weight load in bench press) is ("weight W of the slide unit 4 itself" + "load Fu on the lower side generated by the hydraulic cylinder 5"). As shown in the schematic diagram of FIG. 9(a), the "load Fu on the lower side generated by the hydraulic cylinder 5" is Fu=P×As, where P is the hydraulic pump pressure acting on the hydraulic cylinder 5 (pressure acting on the rod side of the piston) and As is the cylinder rod side area. Note that no pressure is applied to the head side area of ​​the piston. In other words, the load F applied to the user is expressed by the relational expression F=W+(P×As), and has a linear relationship with the hydraulic pump pressure P as shown in the graph of FIG. 9(b). More specifically, for example, if the weight W of the slide unit 4 itself is 30 kg and it is desired to perform bench press training with a load of 50 kg, by appropriately selecting the hydraulic pump pressure P so that the downward load Fu generated by the hydraulic cylinder 5 is 20 kg, bench press training can be performed with an exercise load of 50 kg.

[0026] On the other hand, when bench press exercise is performed under a load condition lower than the weight W of the slide unit 4 itself, the load applied by the hydraulic cylinder 5 is set to be on the upward side, and the load F applied to the user is ("weight W of the slide unit 4 itself" - "upper load Fu generated by the hydraulic cylinder 5"). As shown in the schematic diagram of FIG. 10(a), the "downward load Fu generated by the hydraulic cylinder 5" is Fu = P × Ar by applying the same hydraulic pump pressure P to both the head side and rod side of the cylinder. Here, Ar is the piston rod area. The piston rod area Ar is ("head side area Ah of the piston" - "rod side area As of the piston (cylinder piston effective area)"). In other words, the load F applied to the user is expressed by the relational expression F = W - (P × Ar), and has a linear relationship with the hydraulic pump pressure P as shown in the graph of FIG. 10(b). More specifically, for example, if the weight W of the slide unit 4 itself is 30 kg and bench press training is to be performed with a load of 15 kg, by appropriately selecting the hydraulic pump pressure P so that the upper load Fu generated by the hydraulic cylinder 5 is 15 kg, bench press training can be performed with an exercise load of 15 kg. By configuring so that the hydraulic pump pressure P is applied to both the head side and the rod side of the cylinder and calculating the load F applied to the user by the above-mentioned relational expression F=W-(P×Ar), the upper load Fu generated by the hydraulic cylinder 5 can be set with high accuracy.

[0027] As described above, the hydraulically driven bench press 1 according to the present invention is configured to be able to calculate the load to be applied to the user by formula 1: F=W+(P×As) when the load is applied by the hydraulic cylinders 5 to the upward side, and by formula 2: F=W-(P×Ar) when the load is applied by the hydraulic cylinders 5 to the downward side, and is configured to be able to freely select between the first operation mode according to formula 1 and the second operation mode according to formula 2. Also, it is configured so that switching between the first operation mode and the second operation mode can be automatically performed by PLC control.

[0028] Regarding the method of setting the output power in the hydraulically driven bench press 1 according to the present invention, the output power setting value is displayed on the touch panel on the operation panel, and first, the first operation mode (formula 1) or the second operation mode (formula 2) is selected with the initial value W as the boundary. After that, regardless of whether the first operation mode (formula 1) or the second operation mode (formula 2) is selected, the output power setting value is set by rotating the handle of the pressure control valve of the hydraulic unit 6 that controls the pressure P left and right while watching the output power setting value on the screen until the desired output power setting value is reached.

[0029] Here, when the first operation mode (Equation 1) is selected, the pressure increases when the handle of the pressure control valve is turned clockwise, and as a result, the force pushing the slide unit 4 downward increases, and the output (load applied to the user) increases. On the other hand, the pressure decreases when the handle is turned counterclockwise, and as a result, the force pushing the slide unit 4 downward decreases, and the output (load applied to the user) decreases.

[0030] When the second operation mode (equation 2) is selected, the pressure increases when the handle of the pressure control valve is turned clockwise, and as a result, the force pushing the slide unit 4 upward increases, and the output (load applied to the user) decreases. On the other hand, the pressure decreases when the handle of the pressure control valve is turned counterclockwise, and as a result, the force pushing the slide unit 4 upward decreases, and the output (load applied to the user) increases.

[0031] It is also possible to replace the pressure control valve with a hybrid hydraulic unit 6 that can control the flow rate and pressure of the hydraulic pump by inverter controlling the rotation speed and torque of the electric motor that drives the hydraulic pump. The pressure control valve can also be an electromagnetic proportional valve, in which case the output set value can be set by a potentiometer that issues a voltage command instead of the handle of the pressure control valve. It is also possible to replace the setting and display of the set value with a mobile terminal other than the touch panel on the operation panel.

[0032] According to the hydraulically driven bench press 1 of the present invention described above, unlike conventional mechanical bench presses, weights (disks) connected to the bar are not required, so there is no need to replace the weights when training with a different load, and it is possible to easily set the desired load. There is also no risk of dropping the weights. Furthermore, since there is no need to replace the weights, even weak women and elderly people can easily perform bench press training. Furthermore, when training in the second operation mode (equation 2), the output (load F applied to the user) can be set from 0, so even weak women and elderly people can use it.

[0033] Furthermore, in the case of bench presses using conventional throttle load cylinders, as mentioned above, the relationship between the throttle opening and the output (load F applied to the user) is not linearly proportional, so it is difficult to set an accurate output value by adjusting the throttle opening alone. However, in the case of the hydraulically driven bench press 1 of the present invention, in both the first operating mode (Equation 1) and the second operating mode (Equation 2), the output (load F applied to the user) is linearly proportional to the value of the hydraulic pump pressure P, so it is possible to set a wide range of accurate output values ​​using only the value of the hydraulic pump pressure P.

[0034] Furthermore, because the hydraulically driven bench press 1 of the present invention always applies the same downward load to the user, the muscle parts and load trained when lifting the barbell and the muscle parts and load trained when lowering it are exactly the same as in the case of a mechanical bench press, and the training content using a mechanical bench press can be reproduced.

[0035] In addition, in the present invention, the hydraulic cylinder 5 is arranged along one of the pillars 21 and is configured to apply a load to one side of the slide unit 4. The slide unit 4 is configured to include a pair of slide blocks 41 that slide on each guide bar 3, a grip bar 42 that is arranged between the pair of slide blocks 41, and a connecting bar 43 that is arranged between the pair of slide blocks 41 above the grip bar 42. This makes it possible to increase the rigidity of the slide unit 4. Even if one hydraulic cylinder 5 on one side is used to move two guide bars 3, which are located relatively far apart, up and down, it is possible to effectively prevent rattling due to uneven load, and also to apply a reaction force to the grip bar 42 evenly.

[0036] In addition, by connecting both ends of the grip bar 42 to the lower end side of the slide block 41 and connecting both ends of the connecting bar 43 to the upper end side of the slide block 41, the slide unit 4 is formed in a U-shape when viewed from the front. With this configuration, the rigidity of the slide unit 4 can be further increased, and as a result, even when a single hydraulic cylinder 5 on one side is used for up and down movement, the occurrence of rattling due to uneven load can be more effectively prevented, and the reaction force to the grip bar 42 can be applied more evenly.

[0037] Furthermore, by configuring the ratio (H / L x 100%) of the vertical dimension H (height dimension H) to the horizontal dimension L (width dimension L) of the slide unit 4 to be 20% or more, the rigidity of the slide unit 4 can be further increased. As a result, even when a single hydraulic cylinder 5 on one side is used for vertical movement, the occurrence of rattling due to uneven load can be more effectively prevented, and the reaction force to the grip bar 42 can be applied more evenly.

[0038] The hydraulically driven bench press 1 according to one embodiment of the present invention has been described above, but the specific configuration of the hydraulically driven bench press 1 is not limited to the above embodiment. In the above embodiment, of the connecting members 31 that fix the guide bar 3 to the support columns 21, a plate body that protrudes horizontally outward from the connecting member 31 installed on the lower side is configured as the lowest end stopper 7, and the upper surface side of the plate body (lowest end stopper 7) is configured to be able to support the grip bar 42, but the present invention is not limited to this configuration, and the connecting bar 43 may be configured to be able to be supported by a plate body or rod-shaped member that is separately provided on the support columns 21.

[0039] In the first operation mode (Equation 1), when the hydraulic pump pressure acting on the hydraulic cylinder 5 is P=0, the output F=W. In order to make this W "0", it is also possible to control by shifting the line of the graph shown in FIG. 9(b) downward in parallel as it is. That is, as shown in the schematic diagram of FIG. 11(a), the back pressure valve applies a back pressure P2 according to the weight W of the slide unit 4 to the cylinder head side (W≦F2=P2×Ah), and the pressure control on the other cylinder rod side applies (F1=P1×As) to the pressure reducing valve. At this time, the load F applied to the user is F=F1-F2 (Equation 3), which has a linear relationship with the hydraulic pump pressure P, as shown in the graph of FIG. 11(b). By performing such control using Equation 3, it is possible to set the load F applied to the user to any value equal to or greater than 0 without using the second operation mode. Even when performing control using this Equation 3, the above-mentioned effects can be achieved. Although the back pressure valve and the pressure reducing valve are separate, a balancing valve in which both valves are integrated may be used.

[0040] Also, for example, the hydraulically driven bench press 1 may be configured with a hanging bar provided on the upper part of the gate-shaped frame 2. Also, a wire pulley may be attached to the upper part of the gate-shaped frame 2, one end of the wire may be connected to the upper part of the slide unit 4, for example, to the connecting bar 43, and a handle provided on the other end of the wire may be grasped by the user to move the slide unit 4 up and down for training. [Explanation of symbols]

[0041] 1. Hydraulic Powered Bench Press 2 Gate frame 21 Post 3 Guide bar 4 Slide unit 41 Slide Block 42 Grip Bar 43 Connecting bar 44 Bearings 5 Hydraulic Cylinders 6 Hydraulic Unit 7 Bottom stopper 8 Intermediate waiting pin 9 Intermediate Waiting Hook

Claims

1. A portal frame having a pair of upright columns; A pair of guide bars arranged along the longitudinal direction of each of the pillars; a slide unit disposed between the pair of guide bars and slidable up and down along the pair of guide bars; a hydraulic cylinder that applies a load to the slide unit, the slide unit includes a pair of slide blocks that slide on each of the guide bars, a grip bar that is disposed between the pair of slide blocks, and a connecting bar that is disposed between the pair of slide blocks above the grip bar, 13. A hydraulically driven bench press, wherein the hydraulic cylinder applies a load downward to the slide unit.

2. 2. The hydraulically driven bench press according to claim 1, wherein the hydraulic cylinder is configured to be switchable between a first operating mode in which a load is applied downward to the slide unit and a second operating mode in which a load is applied upward to the slide unit.

3. 3. The hydraulically driven bench press according to claim 1, wherein the hydraulic cylinder is disposed along one of the support columns and applies a load to one side of the slide unit.

4. 3. The hydraulically driven bench press according to claim 1, wherein both ends of the grip bar are connected to the lower end side of the slide block, both ends of the connecting bar are connected to the upper end side of the slide block, and the slide unit is formed in a U-shape when viewed from the front.

5. 5. The hydraulically driven bench press according to claim 4, wherein a ratio (H / L×100%) of a vertical dimension H to a horizontal dimension L of the slide unit is 20% or more.

6. The slide unit includes a plate body disposed on one of the slide blocks, 3. The hydraulically driven bench press according to claim 1, wherein the plate body is provided with a protrusion that protrudes horizontally outward from one of the slide blocks, a tip end of a piston rod of the hydraulic cylinder is connected to the protrusion, and a load applied by the hydraulic cylinder acts on the slide unit via the protrusion.

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