JP6694348B2 - Firewood splitting device - Google Patents

Description

  The present invention relates to a wood burning device.

  Conventionally, some wood chopping devices have a support with a cutting blade for chopping wood supported rotatably on a base so that the support can stand upright against the ground or lie horizontally on the ground. There is a thing whose posture can be changed (for example, Patent Document 1).

Japanese Utility Model Publication No. 7-23506

  A member necessary for driving the cutting blade into the firewood, such as a hydraulic cylinder for driving the cutting blade, is attached to the pillar, and the movable portion including the pillar and the cutting blade is very heavy. Therefore, if a hydraulic cylinder for rotating and driving the supporting column is provided in addition to the hydraulic cylinder for driving the cutting blade as in the firewood splitting device described in Japanese Utility Model Laid-Open No. 7-23506, the posture of the supporting column can be easily changed.

  However, in such a wood-splitting device, since the wood-splitting device becomes large and expensive, it is preferable to manually rotate and drive the support columns to reduce the hydraulic cylinders. On the other hand, if the column is simply rotated manually, the moving part is very heavy and the work load is large. Further, if the worker releases his hand from the movable part in the process of changing the posture of the support column, the movable part loses its support and falls freely. Then, there is a possibility that the wood splitting device may be damaged by the impact when the support pillar falls down, and a careful operation is required when changing the posture of the support pillar.

  Therefore, an object of the present invention is to provide a wood-splitting device that can reduce the work load and reduce the speed at which the support column falls down even if the posture of the support column is changed manually.

  The invention according to claim 1 which solves the above-mentioned problems, in which a wood splitting part is attached, and which is rotatably supported by a base and can be tilted up and down, and is interposed between the base and the column. And an assisting member for assisting the rotation of the column in the standing direction. According to this configuration, the assisting member can assist the rotation of the column in the upright direction and can suppress the rotation of the column in the fall direction.

  According to a second aspect of the present invention, the configuration according to the first aspect is provided and the assisting member is a gas spring. Therefore, the assisting force of the assisting member can be easily adjusted, and fine adjustment can be performed. Further, the assisting member can be easily replaced, and the wood breaking device can be downsized.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, the assisting member includes a cylinder, a piston that is movably inserted into the cylinder to partition the inside of the cylinder into two chambers, and It has a rod connected to the piston and extending to the outside of the cylinder, and a damping passage that connects the two chambers and provides resistance to the flow of fluid moving between the chambers. According to this configuration, the assisting member exerts a damping force that prevents the posture of the support column from changing, so that the rotation speed of the support column in the fall direction can be further reduced and safety can be improved.

  According to a fourth aspect of the invention, in addition to the configuration of the first aspect, the assisting member is a metal spring. According to this configuration, there is no risk of gas leakage.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, the strut is movable in a range from an upright posture to a fallen posture, and the assisting member includes the strut. The assisting force of the assisting member is set so as to suspend the moment due to the gravity that rotates the support column in the laid-down direction at a predetermined angle between the standing posture and the lying-down posture. According to this structure, since the support pillar can stand still in the posture between the upright posture and the lying posture, the worker can be in a posture suitable for the angle of the support pole while the support pillar is stationary. Therefore, it is easy to work.

  According to a sixth aspect of the present invention, in addition to the configuration according to any one of the first to fifth aspects, the assisting member is provided in the range from the middle of the movable region of the support column to the standing side by the assisting member. It is set so that a supporting force does not act on the pillar. With this configuration, it is possible to prevent the impact from increasing when the support column is in the upright posture.

  According to a seventh aspect of the present invention, the configuration according to any one of the first to sixth aspects is provided, and the base is provided with a mounting portion that rotatably supports the support column, and the assisting member is provided. A member is connected to the mounting portion. According to this structure, the stroke length of the assisting member can be shortened, and a small assisting member can be adopted. Further, the structure of the base can be simplified, so that the cost can be reduced.

  In the invention according to claim 8, the structure according to any one of claims 1 to 7 is provided, and a long hole extending in the extension direction of the assisting member is formed by being connected to one end of the assisting member. A bracket is provided, and the bracket has a stopper that is connected to the column via a pin that is inserted into the elongated hole and that fixes the movement of the pin when the pin abuts on the anti-assisting member side. Therefore, it is easy to set so that the assisting force of the assisting member does not act on the support in the range from the middle of the movable region of the support to the standing side. Furthermore, since the support member can prevent the support column in the standing posture from rotating in the fall direction, the support column can be stably maintained in the standing posture.

  According to the wood splitting device of the present invention, even if the posture of the column is manually changed, the work load can be reduced and the rate at which the column falls can be reduced.

It is the side view which showed the firewood splitting device which concerns on one embodiment of this invention, and shows the state which the support | pillar of the firewood splitting device took the laid posture. It is the side view which showed the firewood splitting device which concerns on one embodiment of this invention, and shows the state which the support | pillar of the firewood splitting device took the standing posture. It is the longitudinal cross-sectional view which expanded and showed the gas spring of the firewood splitting apparatus which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view showing a modified example of the gas spring of the firewood splitting device according to one embodiment of the present invention and showing the gas spring in an enlarged manner.

  Embodiments of the present invention will be described below with reference to the drawings. Like reference symbols in the several drawings indicate like parts.

  A firewood splitting apparatus A according to an embodiment of the present invention shown in FIG. 1 includes a truck 1 having a crawler 10, a base 2 loaded on the truck 1, and an engine 11 loaded on the truck 1 to drive the crawler 10. A handle 12 for steering the wood-splitting device A, a pillar 3 that can be tilted up and down on the base 2, a wood-splitting part 4 that is mounted on the pillar 3, and a wood-splitting part 4 that is mounted on the pillar 3. Between the hydraulic cylinder 5 for driving the hydraulic cylinder 5, the pump 6 for driving the hydraulic cylinder 5, the bottom plate 7 fixed at one end in the longitudinal direction of the supporting column 3 facing the firewood splitting section 4, and the supporting column 3 and the base 2. And a gas spring 8 installed in the.

  In this way, the wood-splitting device A is a tracked vehicle having the crawler 10 and is self-propelled with the engine 11. The configuration of the wood splitting device A is not limited to that shown in the figure, and may be provided with tires instead of the crawlers 10 and may be a traction type without the engine 11. Further, the wood breaking device A is a stationary type used at a fixed position and may be provided with legs that support the base 2.

  When the left side of FIG. 1 in the wood chopping device A is the front side, the right side of FIG. 1 is the rear side, the front side of FIG. 1 is the left side, and the back side of FIG. 1 is the right side, the base 2 is integrated with the body of the bogie 1. The engine 11 and the pump 6 are loaded on the rear portion of the base 2. Further, the base 2 is fixed with a mounting portion 20 standing upright on the front portion of the base 2, a stopper 21 standing upright behind the mounting portion 20 of the base 2, and a stopper 22 extending forward of the base 2. Then, the column 3 is rotatably connected to the tip of the mounting portion 20.

  The support column 3 rotates around the axis of a pin 30 that extends in the lateral direction of the support column 3 and extends to the left and right of the firewood splitting device A (front and rear in FIG. 1). More specifically, the column 3 shown in FIG. 1 is arranged above the base 2 and is tilted so as to be substantially horizontal to the ground G. When such a posture is referred to as a laid posture, the support column 3 that is in the laid posture is supported from below by the stopper 21, and the stopper 21 limits the clockwise rotation in FIG. 1. Then, when the column 3 in the lying posture is rotated counterclockwise in FIG. 1 about the pin 30 as a fulcrum, it can be rotated to the position shown in FIG. The column 3 shown in FIG. 2 is arranged in front of the base 2 and stands up so as to be substantially perpendicular to the ground G. When such a posture is set as the standing posture, the column 3 having the standing posture is supported from the rear by the stopper 22, and the stopper 22 restricts the counterclockwise rotation in FIG. In this way, the support column 3 can be moved within a range of about 90 degrees from the lying posture to the standing posture.

  As described above, the wood-splitting part 4, the hydraulic cylinder 5, and the bottom plate 7 are attached to the pillar 3, and these rotate together with the pillar 3. Then, when a member that is a combination of the support column 3 and a member that rotates with the support column 3 (firewood splitting section 4, hydraulic cylinder 5, bottom plate 7, etc.) is the movable section M, this movable section M stands upright with the support column 3. Or, it falls down together with the pillar 3. In the pillar 3, when the base 2 side is the back surface and the opposite side is the front surface, the wood splitting section 4 and the hydraulic cylinder 5 are mounted on the front surface of the pillar 3, and the bottom plate 7 is mounted so as to project from the front surface of the pillar 3. Has been.

  Subsequently, the hydraulic cylinder 5 has a cylinder 5a fixed to the support column 3 and a rod 5b movably inserted into the cylinder 5a, and the wood splitting portion 4 is provided at the tip of the rod 5b protruding outside the cylinder 5a. Are connected. The firewood splitting section 4 has a cutting blade for splitting the firewood, and the cutting blade has a wedge shape. A pump 6 is connected to the hydraulic cylinder 5 via a hose (not shown). The hose constitutes a passage that connects the hydraulic cylinder 5 and the pump 6, and has a passage and a valve that opens and closes the passage to form a hydraulic circuit for driving the hydraulic cylinder 5. Since a well-known configuration can be appropriately adopted as the configuration of the hydraulic circuit, detailed description thereof will be omitted here.

  Then, when oil is sent to the hydraulic cylinder 5 by the pump 6 and the rod 5b is withdrawn from the cylinder 5a to extend the hydraulic cylinder 5, the firewood splitting part 4 moves downward together with the rod 5b in FIG. To do. Therefore, as shown by the chain double-dashed line in FIG. 2, when the firewood W is arranged between the firewood splitting portion 4 and the bottom plate 7 and the hydraulic cylinder 5 is extended, the firewood splitting portion 4 is driven into the firewood W. The firewood W can be broken. On the contrary, when oil is sent to the hydraulic cylinder 5 by the pump 6 and the rod 5b is advanced into the cylinder 5a to contract the hydraulic cylinder 5, the wood splitting part 4 moves upward together with the rod 5b in FIG. Get away from. Therefore, the wood splitting part 4 can be returned to the initial position.

  In addition, as shown in FIG. 1, the supporting pillar 3 may be in a lying posture, and the firewood W may be broken while the movable portion M is lying down. Further, in the firewood splitting device A, the firewood splitting portion 4 is driven by the hydraulic cylinder 5. However, the firewood splitting portion 4 is fixed to the support column 3 and the bottom plate 7 is driven by the hydraulic cylinder to drive the bottom plate 7 into the firewood splitting portion. 4 may be drawn, and the method for breaking the firewood W can be changed as appropriate. The configuration for driving the wood splitting section 4 or the bottom plate 7 is not limited to the hydraulic cylinder, and may be a cylinder device other than the hydraulic cylinder or another actuator.

  Next, as shown in FIG. 3, the gas spring 8 interposed between the support column 3 and the base 2 includes a cylinder 8a, a piston 8b slidably inserted into the cylinder 8a, and a piston at one end. 8b, and the other end thereof extends to the outside of the cylinder 8a. In the cylinder 8a, two chambers R1 and R2, which are partitioned by the piston 8b and in which compressed gas is enclosed, are formed. In addition, a passage 8d that connects the two chambers R1 and R2 is formed in the piston 8b. Then, when the gas spring 8 is compressed and the rod 8c enters the cylinder 8a, the pressure in the cylinder 8a rises and an elastic force corresponding to the amount of compression is exerted.

  Liquid is stored in the chamber R1 on the rod 8c side, and lubricates the sliding surface of the seal 8e that seals the outer periphery of the rod 8c. Since the position of the liquid surface O of the liquid in the room R1 changes according to the inclination angle of the gas spring 8, the gas spring 8 is mounted with the cylinder 8a facing upward for lubrication, and the position of the liquid surface O The seal 8e is located on the lower side. Further, in the gas spring 8, as shown in FIG. 1, a cylinder 8a is rotatably connected to a side of the support cylinder 3 closer to the hydraulic cylinder 5 than a pin 30 and a rod 8c is rotatably connected to a mounting portion 20. Therefore, the elastic force of the gas spring 8 acts in the direction in which the column 3 is erected. That is, the gas spring 8 functions as an assisting member for assisting the rotation of the support column 3 in the standing direction. In addition, a moment due to an elastic force that the gas spring 8 acts on the column 3 in the standing direction is used as the assisting force.

  The center of gravity of the movable portion M is closer to the hydraulic cylinder 5 than the pin 30, and when the center of gravity of the movable portion M is behind the vertical line passing through the pin 30, a moment due to gravity causes the column 3 to rotate in the fall direction. And the movable part M tries to rotate clockwise in FIGS. 1 and 2 by its own weight. Then, when the pillar 3 in the lying posture rotates in the upright direction and reaches a predetermined angle, the moment due to gravity that rotates the pillar 3 in the lying direction and the assisting force of the gas spring 8 are balanced. When such a state is regarded as a balanced state, in the balanced state, the support column 3 stands still in an inclined posture between the upright posture and the lying posture. If the angle of the column 3 in the lying position is 0 degree, the angle of the column 3 in the standing position is θ1 (θ1 ≈ 90 degrees), and the angle of the column 3 in the balanced state is θ2, the angle of the column 3 in the balanced state. θ2 is set in a range greater than 0 degrees and less than θ1 (0 <θ2 <θ1).

  Further, the gas spring 8 is extended before the support column 3 reaches the standing posture, and does not prevent the support column 3 from standing in the standing posture after the gas spring 8 is fully extended. More specifically, as shown in FIG. 3, a long hole 8g is formed in a bracket 8f provided at the bottom of the cylinder 8a in the gas spring 8, and the cylinder 8a is inserted through a pin 80 inserted into the long hole 8g. Are connected to the columns 3. Therefore, the cylinder 8a can rotate around the axis of the pin 80, and the inclination of the gas spring 8 changes according to the rotation of the support column 3. Further, when the angle of the support column 3 when the gas spring 8 is fully extended is θ3, the angle of the support column 3 is smaller than θ3, and in the state where the gas spring 8 is compressed, as shown by the two-dot chain line in FIG. Since the pin 80 contacts the edge of the elongated hole 8g on the cylinder 8a side, the assisting force of the gas spring 8 is transmitted to the column 3. However, when the angle of the column 3 becomes larger than θ3, the pin 80 moves in the elongated hole 3d to the side opposite to the cylinder, as shown by the solid line in FIG. The angle θ3 is set to be larger than the angle θ2 of the support column 3 in the balanced state and less than the angle θ1 of the support column 3 in the standing posture (θ2 <θ3 <θ1). The angle θ3 of the column 3 when the gas spring 8 is fully extended may be equal to the angle θ2 of the column 3 in the balanced state or the angle θ1 of the column 3 in the standing posture.

  Further, the bracket 8f is provided with a rotatable stopper 81 which is accommodated in the bracket 8f when pushed by the pin 80 from the cylinder 8a side but does not move even if pushed by the pin 80 from the opposite side. Then, when the angle of the support column 3 is less than θ3 in the process of rotating the support column 3 in the standing direction, the pin 80 is arranged closer to the cylinder 8a than the stopper 81, and the support column 3 is in the standing posture, The pin 80 is set so as to be located on the side opposite to the cylinder of the stopper 81. Although not shown, the stopper 81 is preferably provided with a lever for housing the stopper 81 in the bracket 8f. Further, although not shown, it is preferable to provide various lock mechanisms in the wood splitting device A so that the upright posture and the fallen posture of the support pillar 3 can be reliably maintained. By providing such a lock mechanism, the stopper 81 is provided. May be abolished.

  Hereinafter, the operation of the wood burning device A according to the present embodiment will be described.

  When the angle of the support column 3 is less than the angle θ2 at which the support column 3 is in a balanced state, the moment due to gravity that rotates the support column 3 in the fall direction exceeds the assisting force of the gas spring 8. The smaller the angle of the column 3 is, the larger the moment due to the gravity is. However, the smaller the angle of the column 3, the larger the compression amount of the gas spring 8 is. Therefore, the assisting force of the gas spring 8 is increased. Therefore, when a worker needs a large force to rotate the column 3 in the upright direction, a large assisting force can be obtained by the gas spring 8, and the work load is reduced. Further, the characteristic of the elastic force with respect to the compression amount of the gas spring 8 (spring characteristic) is a non-linear characteristic, and the increase amount of the elastic force with respect to the increase amount of the compression amount becomes large on the compression side, so that when the angle of the column 3 is small. It is possible to prevent a lack of supporting force.

  Further, even if the operator releases his or her hand from the movable portion M in a state where the angle of the support column 3 is less than the angle θ2 in which the support column 3 is in a balanced state, the assisting force of the gas spring 8 prevents the support column 3 from rotating in the fall direction. Since it acts in the direction, it is possible to prevent the rotation speed of the column 3 in the laid-down direction from decelerating and the column 3 to be rapidly changed to the laid-down posture. In other words, the falling speed of the movable part M is decelerated by the gas spring 8 and the movement of the movable part M becomes slow, which is safe. For example, the hose connecting the hydraulic cylinder 5 and the pump 6 is the column 3 and the base 2. It is possible to prevent the wood splitting device A from being damaged by the impact when the movable part M is dropped, for example, it is prevented from being sandwiched between and.

  Subsequently, the angle of the support column 3 becomes an angle θ2 in which the support column 3 becomes a balanced state, and when the moment due to the gravity that rotates the support column 3 in the fall direction and the assisting force of the gas spring 8 are balanced, the support column 3 is supported even if the operator does not support it. 3 is kept stationary in a tilted posture. For this reason, the operator can take a position suitable for the angle of the support column 3, such as a position for supporting the movable portion M and a supporting method, while the support column 3 is stationary in an inclined posture.

  Further, when the angle of the support column 3 exceeds the angle θ2 at which the support column 3 is in a balanced state, the momentum due to the gravity acting on the support column 3 exceeds the assisting force of the gas spring 8, so that the support column 3 can stand in the upright direction without applying force. Rotate to. However, when the angle of the support column 3 exceeds the angle θ3 at which the gas spring 8 fully extends, the assisting force of the gas spring 8 does not act on the support column 3, so that the support column 3 can be prevented from colliding with the stopper 22. When the pin 80 moves beyond the stopper 81 toward the side opposite to the cylinder, the stopper 81 restricts the movement toward the cylinder 8a. For this reason, since the gas spring 8 can prevent the support column 3 in the upright posture from rotating in the fall direction, the support column 3 can be stably maintained in the upright posture. Further, when it is desired to return the upright posture pillar 3 to the lying posture, the operator may store the stopper 81 in the bracket 8f.

  Hereinafter, the function and effect of the wood burning device A according to the present embodiment will be described.

  In the present embodiment, the wood splitting device A includes a bracket 8f which is connected to one end of the gas spring 8 and has a long hole 8g extending in the extension direction of the gas spring 8. The bracket 8f has a long hole 8g. It has a stopper 81 which is connected to the support column 3 through a pin 80 which is inserted into the pin 80 and which fixes the movement of the pin 80 when the pin 80 contacts the anti-assisting member side (the side opposite to the cylinder 8a). The term "abutting" as used herein means, for example, that the pin 80 is provided on the anti-assisting member side in the elongated hole 8g by the stopper 81 in a state where there is a clearance to the extent that it does not hinder the chopping work (within the range of common sense). Including those that are fixed.

  According to this configuration, since the hole through which the pin 80 is inserted is the elongated hole 8g, the assisting force of the gas spring 8 is provided in the range from the middle of the movable region of the column 3 (the range from the standing posture to the fall posture) to the standing side. Can be easily set so as not to act on the column 3. Further, when the movement of the pin 80 in the elongated hole 8g is restricted by the stopper 81, the assisting force of the gas spring 8 acts on the support column 3, so that the support column 3 in the upright posture rotates in the fall direction. Can be suppressed by the gas spring 8, and the support column 3 can be stably maintained in the standing posture.

  Further, in the present embodiment, the base 2 is provided with the mounting portion 20 that rotatably supports the support column 3, and the gas spring (assisting member) 8 is connected to the mounting portion 20 and the mounting portion 20 is attached. It is supported by the base 2 through. According to this structure, the gas spring 8 can be arranged near the rotation center of the support column 3, so that the stroke length of the gas spring 8 can be shortened and a small gas spring 8 can be adopted. Furthermore, since the gas spring 8 is attached to the base 2 by using the attachment portion 20 for attaching the support column 3, a dedicated attachment portion for the gas spring 8 is unnecessary. Therefore, the structure of the base 2 can be simplified, and the cost can be reduced. The mounting position of the assisting member such as the gas spring 8 is not limited to the above, and may be changed as appropriate. For example, when the column 3 rotates in the fall direction, the assisting member may be stretched to exert an assisting force that prevents the column 3 from rotating in the fall direction.

  Further, in the present embodiment, the gas spring (assisting member) 8 has a supporting force by the gas spring 8 in the range from the middle of the movable region of the support column 3 (the range from the standing posture to the falling posture) to the standing side. It is set not to act on. For this reason, it is possible to prevent the strut 3 from colliding with the stopper 22 due to the assisting force of the gas spring 8 and increasing the impact when the strut 3 is in the upright posture.

  Further, in the present embodiment, the long hole 8g is provided in the bracket 8f of the gas spring 8 on the cylinder 8a side, and the pin 80 moves in the long hole 8g even after the gas spring 8 is fully extended. 3 can rotate in the standing direction. Therefore, when the angle of the support column 3 becomes equal to or greater than the angle θ3 at which the gas spring 8 fully extends, the assisting force of the gas spring 8 does not act on the support column 3, and the fully extended gas spring 8 rotates the column 3 in the standing direction. Is not hindered.

  A long hole may be provided in the bracket of the gas spring 8 on the rod 8c side, and the configuration for preventing the assisting force of the gas spring 8 from being transmitted to the support column 3 in a predetermined region can be appropriately changed. Further, the angle θ3 of the column 3 where the gas spring 8 extends can be changed as appropriate. For example, the gas spring 8 may be fully extended when the support column 3 is in the upright posture (θ1 = θ3), and in this case, the elongated hole 8g may be an ordinary round hole. Further, the assisting force of the gas spring 8 may act on the column 3 in the entire movable range of the column 3. Then, these changes can be made regardless of the mounting position of the gas spring 8, etc., of the assisting member.

  Further, in the present embodiment, the support column 3 can be moved in a range from a standing posture to a lying posture. The gas spring (assisting member) 8 causes the supporting force of the gas spring 8 to rotate the support column 3 in the falling direction while the support column 3 is at a predetermined angle (θ2) between the upright posture and the falling posture. It is set to suspend the moment of gravity. That is, since the support column 3 stands still in an inclined posture between the upright posture and the lying posture, the worker can take a posture suitable for the angle of the support column 3 while utilizing the stationary posture. Therefore, since the worker can change the posture of the support column 3 in a comfortable posture, the work is easy and the work load can be further reduced.

  The moment due to gravity may exceed the assisting force of the gas spring 8 in the entire movable range of the support column 3, and the setting of the assisting force of the gas spring 8 can be appropriately changed. The change is possible regardless of the mounting position of the assisting member such as the gas spring 8 and the setting of the angle of the column 3 that receives the assisting force of the assisting member.

  In addition, in the present embodiment, the gas spring (assisting member) 8 includes a cylinder 8a, a piston 8b slidably inserted into the cylinder 8a to divide the cylinder 8a into two chambers R1 and R2, and one end thereof. Has a rod 8c connected to the piston 8b and the other end extending to the outside of the cylinder 8a. Gas is enclosed in each of the two chambers R1 and R2, and the two chambers R1 and R2 are communicated with each other through a passage 8d. According to the gas spring 8, since the air chamber volume is large and the elastic force can be increased, a large assisting force can be exerted.

  The configuration of the gas spring 8 is not limited to the above, and can be changed as appropriate. For example, the gas spring 8 may be configured as shown in FIG. The gas spring 9 according to the modified example includes a cylinder 9a, a piston 9b slidably inserted into the cylinder 9a to partition the inside of the cylinder 9a into two chambers R3 and R4, and one end of which is connected to the piston 9b. The other end has a rod 9c extending to the outside of the cylinder 9a, and a free piston 9d that is slidably inserted in the opposite side of the cylinder 9a and forms an air chamber R5 inside the cylinder 9a. The two chambers R3 and R4 are respectively filled with the liquid, and the two chambers R3 and R4 are communicated with each other by the damping passage 9e, and the damping passage is added to the flow of the liquid moving between the two chambers R3 and R4. 9e gives resistance.

  According to this configuration, when the gas spring 9 expands and contracts, resistance is given to the flow of the liquid moving in the two chambers R3 and R4 by the damping passage 9e, and a differential pressure is generated in the two chambers R3 and R4 to generate a differential pressure. A damping force that prevents the expansion and contraction of 9 can be exhibited. Therefore, when the gas spring 9 is used as an assisting member of the wood splitting apparatus A, the speed at which the support column 3 falls can be further reduced, and thus the safety can be further improved. Moreover, since the chamber R4 on the rod 9c side of the gas spring 9 is filled with liquid, there is a concern that the seal 9f may be insufficiently lubricated no matter what angle the rod 9c is used, for example. Absent. The passage 8d of the gas spring 8 shown in FIG. 3 may be used as a damping passage so that the gas spring 8 exerts a damping force by giving resistance to the flow of gas passing through the passage. Further, the damping force may be exerted only when the gas springs 9 and 8 contract. These changes are possible regardless of the mounting positions of the gas springs 8 and 9, etc., the assisting member, the setting of the angle of the supporting column 3 which receives the supporting force of the supporting member, and the setting of the angle of the supporting column 3 in a balanced state. is there.

  Further, in this embodiment, the assisting members are the gas springs 8 and 9. Therefore, the spring characteristics of the gas springs 8 and 9 become non-linear characteristics, and the elastic force on the compression side can be increased to increase the assisting force. Therefore, it is possible to prevent a shortage of the assisting force when the angle of the column 3 is small. Further, according to the above configuration, since the assisting force of the gas springs 8 and 9 can be changed by changing the internal pressure by supplying and discharging the gas, the assisting force can be adjusted easily and finely. Therefore, the degree of freedom in setting the angle and the like of the support column 3 in a balanced state is large, and the setting is easy. Further, even if the gas springs 8 and 9 have different performances such as spring characteristics or damping characteristics, it is easy to make them the same size, and therefore it is easy to replace the gas springs with different performances.

  The assisting member is not limited to the gas spring, and may be a metal spring such as a coil spring, a disc spring, or a leaf spring. In this case, there is no concern about gas leakage. Further, the assisting member may include a gas spring and a metal spring. Such a change is possible regardless of the mounting position of the assisting member, the setting of the angle of the support column 3 which receives the assisting force of the assisting member, and the setting of the angle of the support column 3 in a balanced state.

  Here, for example, when the assisting member is a coil spring, if the coil spring is a two-stage spring and the spring constant is set to be large when the coil spring is compressed by a predetermined amount or more, the gas springs 8 and 9 are obtained. Similarly, it is possible to prevent a shortage of the assisting force when the angle of the column 3 is small. However, in this case, the structure becomes complicated and the size may be increased as compared with the case where the gas springs 8 and 9 are used as the assisting members. This is because when a coil spring is used, it is necessary to provide a guide or the like for suppressing buckling, and it is difficult to use the coil spring alone. For this reason, when the gas spring is used as the assisting member, the construction of the firewood splitting device A can be simplified and downsized.

  In addition, in the present embodiment, the firewood splitting device A includes a base 2, a pillar 3 that is rotatably supported by the base 2 and can be tilted, a firewood splitting portion 4 attached to the pillar 3, the base 2 and the pillar. And gas springs (assisting members) 8 and 9 which are interposed between the gas springs 3 and 3 and assist the rotation of the column 3 in the upright direction. Therefore, even if the support column 3 is manually driven to rotate and the posture of the support column 3 is changed, the work load can be reduced. Further, since the gas springs 8 and 9 as the assisting members prevent rotation of the support column 3 in the fall direction, even if the worker releases the movable part M in the process of changing the posture of the support column 3, the support column 3 You can slow down the rotation speed of the to the laying direction. Therefore, it is possible to prevent the firewood splitting device A from being damaged, such as a case where a bose or the like is sandwiched between the support 3 and the base 2, and the posture of the support 3 can be changed safely.

  The preferred embodiments of the present invention have been described above in detail, but modifications, variations, and changes can be made without departing from the scope of the claims.

A ... wood splitting device, R1, R2, R3, R4 ... room, 2 ... base, 3 ... pillar, 4 ... wood splitting part, 8, 9 ... gas spring (assistance Member), 8a, 9a ... Cylinder, 8b, 9b ... Piston, 8c, 9c ... Rod, 9e ... Damping passage, 8f ... Bracket, 8g ... Long hole, 20 ...・ Mounting part, 80 ... pin, 81 ... stopper

Claims (8)

Base,
A pillar that is rotatably supported by the base and can be tilted,
A wood splitting part attached to the pillar,
A wood chopping device, comprising: an assisting member that is interposed between the base and the pillar to assist in the rotation of the pillar in the upright direction. The wood chopping device according to claim 1, wherein the assisting member is a gas spring. The assisting member includes a cylinder, a piston that is movably inserted into the cylinder to partition the inside of the cylinder into two chambers, a rod that is connected to the piston and extends outside the cylinder, and the two chambers. The wood chopping device according to claim 2, further comprising: a damping passage that is in communication with each other and that provides resistance to a flow of a fluid moving between the chambers. The wood chopping device according to claim 1, wherein the assisting member is a metal spring. The pillar can be moved in a range from a standing posture to a lying posture,
The assisting member is set such that the assisting force of the assisting member suspends a moment due to gravity that rotates the support column in the fall direction in a state where the support column is at a predetermined angle between the upright posture and the fall posture. The firewood splitting device according to any one of claims 1 to 4, wherein The assisting member is set such that the assisting force of the assisting member does not act on the support column in the range from the middle of the movable region of the support column to the standing side. The firewood splitting device according to one item. The base is provided with a mounting portion that rotatably supports the column,
The wood splitting device according to any one of claims 1 to 6, wherein the assisting member is connected to the mounting portion. A bracket connected to one end of the assisting member and having an elongated hole extending in the extension direction of the assisting member;
The bracket has a stopper that is connected to the column through a pin that is inserted into the elongated hole and that fixes the movement of the pin when the pin abuts on the anti-assisting member side. The firewood splitting device according to any one of Items 1 to 7.