JP4436154B2 - Drawing guide and shock absorber - Google Patents

Description

  The present invention relates to a drawer guide that guides the opening / closing movement of the drawer in a predetermined direction and a shock absorber used therefor.

  Conventionally, a drawer guide having a shock absorber is known. For example, Japanese translations of PCT publication No. 2003-519517 discloses a drawer guide having a shock absorber that brakes the movement of the movable rail in the closing direction using hydraulic pressure. The shock absorber disclosed herein restores the piston rod pushed into the cylinder to a state before being pushed (hereinafter referred to as “original state”) by the force of a spring provided in the cylinder. Yes (see paragraphs [0011] and [0021]).

  In many shock absorbers, in order to return the piston rod to the original state as described above, a spring is built in the cylinder. This is because without the spring, the piston rod remains pushed into the cylinder and cannot absorb the impact again. The magnitude of this spring force increases in proportion to the magnitude of the hydraulic resistance of the shock absorber. Therefore, the force of the spring becomes larger as the shock absorber can absorb a larger impact.

  However, in the drawer guide, the force of the spring acts as a force that moves the movable rail in the opening direction. Therefore, even if a conventional shock absorber is applied to the drawer guide, it is difficult to absorb a large impact. In other words, when the hydraulic resistance of the shock absorber is increased in order to absorb a large impact, the force of the spring acting on the movable rail also increases. This is because a phenomenon of reversing in the opening direction occurs, and as a result, the closed drawer is pushed back in the opening direction.

  The shock absorber is generally provided with an accumulator that can temporarily store oil corresponding to the volume increase of the piston rod that has entered the cylinder. As the accumulator, those made of foam are widely used.

  However, the drawer has the particularity that the time stored in the closed position is much longer than the time pulled out to the open position. When the drawer is housed in the closed position, the piston rod of the shock absorber is pushed into the cylinder, so that oil is accumulated in the accumulator for a long time. If it does so, in the accumulator which consists of foams, since a restoring force falls and it shrink | contracts, there exists a problem that air mixes there and a function falls.

  The drawer has a special feature that the weight changes depending on the presence or weight of the stored object because the object is stored in the drawer. For this reason, the magnitude | size of the load which a shock absorber receives also covers a wide range.

  However, since the conventional shock absorber has only one buffer region within the range in which the piston can move, the load range that can absorb the impact is narrow, and if the load becomes large, the impact cannot be absorbed and an impact sound is generated. It was sometimes generated. In addition, when the hydraulic resistance of the shock absorber is constant, there is also a problem that the moving speed of the movable rail becomes very slow at a light load compared to a heavy load.

  The drawer guide is desired to be a small one that requires a small installation space, and the shock absorber used therefor is also desired to be a small one with a small outer diameter of the cylinder.

  However, since the conventional shock absorber has a complicated structure and a large number of parts, the outer diameter of the cylinder tends to be large, which hinders downsizing of the drawer guide. For example, the shock absorber disclosed in Japanese Patent Application Laid-Open No. 2000-227134 functions as a stopper formed separately from the piston in order to prevent the valve body that opens and closes the oil passage formed in the piston from dropping off. It has a member. The construction of the piston and the stopper as separate members in this manner complicates the structure, increases the number of parts, and hinders downsizing and reduction of manufacturing costs. In addition, there is a risk of accidents such as forgetting to attach a member functioning as a stopper or dropping off, and such an accident has a fatal effect on the braking characteristics.

Special table 2003-515517 gazette JP 2000-227134 A

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a drawer guide and a shock absorber used therefor that can absorb a large impact and can eliminate the reverse return phenomenon of the movable rail. . Another object of the present invention is to provide a shock absorber capable of stably storing oil corresponding to the volume increase of the piston rod that has entered the cylinder, and a drawer guide provided with the shock absorber. It is another object of the present invention to provide a shock absorber capable of absorbing a shock from a light load to a heavy load and a drawer guide including the shock absorber. It is another object of the present invention to provide a shock absorber that has a small number of parts, can be reduced in size, and can be manufactured at a reduced cost, and a drawer guide that includes the shock absorber.

In order to solve the above-mentioned problems, the present invention provides the following drawer guide and shock absorber.
(1) a movable rail that moves along the guide rail, a coupling portion that is provided so that the movable rail can move in the same direction as the movable rail, a cylinder, a piston, and a piston rod; One end of the piston rod protruding from the cylinder is coupled to the coupling portion, and the other end of the piston rod disposed in the cylinder is coupled to the piston, and the piston rod is A shock absorber that brakes the movement of the movable rail in the closing direction by a hydraulic resistance generated when the coupling part moves backward by being moved in the closing direction and is pushed into the cylinder;
The spring for returning the piston rod to the original state is eliminated by advancing the piston rod by the movement of the coupling portion in the opening direction and returning the piston rod to the state before being pushed into the cylinder. Drawer guide.
(2) the shock absorber, the outer peripheral surface and the inner peripheral surface of the cylinder of the piston rod, while sliding the inner peripheral surface and outer peripheral surface, respectively, a movable member that moves along said piston rod, movable characterized by comprising a seal member for sealing the gap formed between the piston rod and the gap and movable member which is formed between the member and the cylinder, and a spring providing a preload to said movable member The drawer guide as set forth in (1) above.
(3) The drawer guide according to (2), wherein the movable member has a groove for bleeding air.
(4) which has a spring to pull the movable rail in the closing direction, the shock absorber, the piston is movable range, gradually increasing the hydraulic resistance in accordance with the said piston moves in the braking force exerted direction a first buffer area, to allow movement of the further braking force exerted direction of the piston via the buffer area of the first, at least the piston is movable range, the inner diameter of the cylinder is the same that can The drawer guide tool according to any one of (1) to (3), wherein the cylinder has a second buffer region in which the inner peripheral surface of the cylinder is formed in a straight shape.
(5) the first buffer area, the inner diameter of the cylinder is such that gradually decreases toward the braking force exerted direction, the inner circumferential surface of the cylinder is formed by being tapered The drawer guide according to (4), characterized in that it is characterized in that
(6) on the inner peripheral surface of the cylinder, drawer guides according to the characterized by having a groove spanning between said first buffer region and the second buffer area (4) or (5) Ingredients.
(7) the piston has a passage of oil, the shock absorber is supported by a shaft portion formed in the piston, by moving along the shaft portion, it has a valve body for opening and closing the passage The valve body is made of an elastic body capable of expanding the size of the hole portion through which the shaft portion is inserted, and is prevented from falling off from the shaft portion by the portion protruding to the outside of the shaft portion. The drawer guide according to any one of (1) to (6), wherein:
(8) and a movable rail moves along the guide rails, the movement of the movable rail, the shock absorber that is used in the drawer guide member having a coupling portion provided so as to move in the same direction as the movable rail The piston rod has a cylinder, a piston, and a piston rod. One end of the piston rod protruding from the cylinder is coupled to the coupling portion, and the other end of the piston rod disposed in the cylinder Is coupled to the piston, and brakes the movement of the movable rail in the closing direction by hydraulic resistance generated when the piston rod is retracted and pushed into the cylinder by the movement of the connecting portion in the closing direction. At the same time, the piston rod is advanced by the movement of the coupling portion in the opening direction and is in a state before being pushed into the cylinder. By ascribed, shock absorber, characterized in that eliminating the spring for returning the piston rod to the original state.
(9) on the inner peripheral surface of the outer circumferential surface of the piston rod cylinder, while sliding the inner peripheral surface and outer peripheral surface, respectively, a movable member that moves along said piston rod, said a movable member cylinder said to be a gap and movable member which is formed between the seal member for sealing the gap formed between the piston rod, characterized in that it comprises a spring providing a preload to said movable member (8 ) Shock absorber.
(10) The shock absorber according to (9), wherein the movable member has an air vent groove.
(11) in the range wherein the piston which is movable, said piston has traversed a first buffer area can be increased gradually hydraulic resistance according to moves to the braking force exerted direction, the buffer area of the first allow movement of the further braking force exerted direction of the piston, at least the piston is movable range, as the inner diameter of the cylinder are the same, the inner circumferential surface of the cylinder is formed in a straight shape The second buffer region, and exerts a braking force against a force of a spring that pulls the movable rail in a closing direction, according to any one of (8) to (10), shock absorber.
(12) said first buffer area, the inner diameter of the cylinder is such that gradually decreases toward the braking force exerted direction, the inner circumferential surface of the cylinder is formed by being tapered The shock absorber according to (11), characterized in that it is characterized in that:
(13) on the inner peripheral surface of the cylinder, shock absorber according to (11) or (12), characterized in that there grooves spanning between said first buffer region and the second buffer region .
(14) the piston has a passage of the oil, is supported by a shaft portion formed in the piston, by moving along the shaft portion, and having a valve element for opening and closing the passage, the valve body Is made of an elastic body capable of expanding the size of the hole portion through which the shaft portion is inserted, and is prevented from falling off from the shaft portion by a portion protruding to the outside of the shaft portion. The shock absorber according to any one of (8) to (13).

According to the present invention described in the above (1) and (8), the forward / backward movement of the piston rod is caused by the movement of the coupling portion. In other words, the piston rod moves backward in the closing direction when the coupling portion moves, and is pushed into the cylinder, while the piston rod moves forward in the opening direction and is pushed into the cylinder. Return to the previous state. For this reason, the spring which returns a piston rod to an original state becomes unnecessary. Since there is no spring, even if the hydraulic resistance of the shock absorber is increased, the piston rod remains pushed into the cylinder unless the coupling portion is moved in the opening direction. Therefore, it is possible to absorb a large impact and to eliminate the reverse return phenomenon of the movable rail.
According to this invention as described in said (2) and (9), oil can be stored in the space formed when a movable member moves along a piston rod. Since the movable member is moderately preloaded by the spring, it is possible to prevent air from entering the space where the oil is accumulated. In addition, since the spring is less likely to have a restoring force and is excellent in durability, oil corresponding to the volume increase of the piston rod that has entered the cylinder can be stably stored. This spring is provided to operate the movable member in accordance with the increase or decrease of the accumulated oil, and the force of this spring does not act as a force for moving the piston rod back and forth. Also, since the gap formed between the movable member and the cylinder and the gap formed between the movable member and the piston rod are sealed by the seal member, the movable member can be appropriately operated. In addition, oil leakage can be prevented.
According to the present invention described in the above (3) and (10), when assembling the movable member, the air remaining in the cylinder can be discharged to the outside using the air vent groove. As a result, it is possible to increase the oil filling rate, and it is possible to prevent a reduction in braking characteristics due to air remaining in the cylinder. Also, some conventional shock absorbers inject oil into the cylinder after assembling the components built in the cylinder. In this method, the injection port for injecting oil and the injection port Therefore, a plug for closing the plug is necessary, which increases the processing cost and the number of parts. In this regard, since the movable member has the air vent groove, it is possible to inject oil into the cylinder before assembling the components built in the cylinder. Therefore, it is not necessary to separately provide an injection port for injecting oil and a plug for closing the oil, and the structure can be simplified and the manufacturing cost can be reduced.
According to the present invention described in the above (4) and (11), in the case of a light load, even if the hydraulic resistance of the shock absorber is large, the movable rail is moved by the force of the spring that pulls the movable rail in the closing direction. Can be moved to the end point in the closing direction. In other words, if the hydraulic resistance of the shock absorber is large, under light load, it is possible that the shock is absorbed by the shock absorber before the movable rail reaches the end in the closing direction and stops halfway. This can be avoided by the force of the spring that pulls in the closing direction. Further, since the first buffer region can gradually increase the hydraulic resistance as the piston moves in the braking force exerting direction, the movable rail can be moved smoothly even in the case of a light load. On the other hand, in the case of a heavy load, even if the shock cannot be sufficiently absorbed in the first buffer region, the shock can be completely absorbed in the second buffer region. Also in this case, the movable rail can be smoothly moved by the first buffer region. Therefore, according to the present invention, the range of the load capable of absorbing the impact is wide, and the impact can be smoothly absorbed from a light load to a heavy load.
According to the present invention described in the above (5) and (12), the gap formed between the piston and the inner peripheral surface of the cylinder gradually becomes smaller toward the braking force exerting direction. It is possible to gradually increase the hydraulic resistance as the movement proceeds.
As another means for providing such a function effect to the first buffer region, for example, as in a shock absorber disclosed in Japanese Patent Laid-Open No. 2000-227134, a cylinder is composed of an outer tube and an inner tube. A method of generating a hydraulic resistance by providing a heavy structure and providing a small hole (orifice) in the peripheral wall of the inner tube may be employed. However, such a means has a drawback that not only the structure becomes complicated and the miniaturization becomes difficult, for example, the cylinder has a double structure, but also the processing cost increases and the number of parts increases.
In this regard, in the present invention, the first buffer region is configured by forming the inner peripheral surface of the cylinder in a tapered shape so that the inner diameter of the cylinder gradually becomes smaller toward the braking force exerting direction. The structure is simplified, and the miniaturization can be easily realized.
According to the present invention described in the above (6) and (13), the oil in at least the second buffer region also utilizes a groove straddling between the first buffer region and the second buffer region. Since it distribute | circulates to a 1st buffer area | region, it becomes possible to suppress the strong repulsion of the shock absorber with respect to a sudden load.
According to the present invention described in (7) and (14), the piston is provided with a shaft portion that supports the valve body, and the valve body expands the size of the hole portion through which the shaft portion is inserted. Since the portion made of the elastic body to be obtained and projecting to the outside of the shaft portion is prevented from falling off from the shaft portion, a member functioning as a stopper that is formed separately from the piston becomes unnecessary. In addition, there is no risk of accidents such as forgetting to attach a member functioning as a stopper or dropping off. According to the present invention, it is possible to reduce the size and the manufacturing cost by simplifying the structure.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings.

  FIG. 1 is a schematic perspective view showing a drawer guide according to an embodiment of the present invention. As shown in this figure, the drawer guide according to this embodiment includes a guide rail 10, a movable rail 20, and a shock absorber 30.

  The guide rail 10 supports the movable rail 20 and plays a role of determining the movement direction of the movable rail 20. The guide rail 10 is fixed to a housing or the like in which the drawer is stored.

  The movable rail 20 is provided so as to move along the guide rail 10. The movable rail 20 is connected to the drawer, and slides in the opening direction when the drawer is pulled out in the opening direction, and slides in the closing direction when the drawer is pushed out in the closing direction.

  The shock absorber 30 plays a role of braking the movement of the movable rail 20 in the closing direction using hydraulic pressure. In this embodiment, the shock absorber 30 is accommodated in the casing 40 attached to the side surface of the guide rail 10.

  FIG. 2 is a view showing the internal structure of the casing 40. As shown in this drawing, in addition to the shock absorber 30, a receiving tool 50 and a spring 60 are accommodated in the casing 40.

  The receiver 50 has protrusions 51 a and 51 b that are fitted into guide grooves 41 formed in the casing 40. The guide groove 41 is a portion parallel to the movement direction of the movable rail 20 (hereinafter referred to as “parallel portion”) 41 a and a portion orthogonal to the movement direction of the movable rail 20 (hereinafter referred to as “orthogonal portion”). And 41b.

  The receiver 50 is inclined when one of the two protrusions 51a and 51b (protrusion 51b) provided on each side of the receiver 50 is in the orthogonal portion 41b of the guide groove 41, and is closed. Locked so that it cannot move in the direction.

  A recess 52 is formed at the upper end of the receiving member 50 to engage with the protruding piece 21 attached to the movable rail 20. The one protrusion 51b of the receiving member 50 escapes from the orthogonal portion 41b of the guide groove 41 when the projecting piece 21 moving in the closing direction collides with the recess 52 of the receiving member 50, and the parallel portion of the guide groove 41 Move to 41a. Thereby, the receptacle 50 can be moved in the closing direction (see FIG. 3).

  On the other hand, when the protruding piece 21 moves in the opening direction and the engagement between the protruding piece 21 and the concave portion 52 of the receiving member 50 is released, the one protrusion 51 b of the receiving member 50 extends from the parallel part 41 a of the guide groove 41. Then, it moves to the orthogonal part 41b of the guide groove 41. Thereby, the receiving tool 50 is locked so that it cannot move in the closing direction again (see FIG. 2).

  As shown in FIGS. 2 and 3, the receiver 50 is also provided with a coupling portion 53 to which the piston rod 33 of the shock absorber 30 is coupled. The coupling portion 53 may be provided so as to be movable in the same direction as the movable rail 20 by the movement of the movable rail 20. Therefore, it is possible to adopt a configuration in which the coupling portion 53 is directly provided on the movable rail 20.

  The coupling portion 53 has a significance in that the piston rod 33 is not only simply coupled as a medium for transmitting an impact, but also the piston rod 33 is substantially advanced and retracted by the movement of the coupling portion 53.

  As shown in FIG. 2, the support 50 is provided with a support portion 54 that supports one end of a spring 60 that pulls the movable rail 20 in the closing direction. The spring 60 is a tension spring. The other end of the spring 60 is supported by a support portion 42 provided in the casing 40.

  When one protrusion 51b of the receiving member 50 is present in the orthogonal portion 41b of the guide groove 41, the spring 60 is pulled in a direction in which both ends are separated from each other, and generates a force for contracting. At this time, since the receiver 50 is locked, the spring 60 does not contract, but when the movable rail 20 moves in the closing direction and the protruding piece 21 of the movable rail 20 collides with the recess 52 of the receiver 50, the receiver Since the lock 50 is released, the spring 60 contracts (see FIGS. 2 and 3). Accordingly, the receiving tool 50 moves in the closing direction, and the movable rail 20 that engages with the receiving tool 50 via the protruding piece 21 is drawn in the closing direction.

  FIG. 4 is a view showing the internal structure of the shock absorber 30. As shown in this figure, the shock absorber 30 includes a cylinder 31, a piston 32, and a piston rod 33.

  The cylinder 31 is formed in a cylindrical shape having one end opened and the other end closed by a bottom wall 31d. Three hollow portions 31a, 31b, and 31c are formed in the cylinder 31 so as to communicate with each other.

  The first hollow portion 31a is provided on one end side of the cylinder 31, and the inner peripheral surface of the cylinder 31 is formed in a straight shape. The second hollow portion 31b is provided between the first hollow portion 31a and the third hollow portion 31c, and the inner peripheral surface of the cylinder 31 gradually decreases so that the inner diameter of the cylinder 31 gradually decreases in the braking force exerting direction. It is formed in a taper shape. In addition, the internal diameter of the part (boundary part with the 1st hollow part 31a) with the largest opening area of the 2nd hollow part 31b is smaller than the internal diameter of the 1st hollow part 31a. The third hollow portion 31c is provided on the other end side of the cylinder 31, and the inner peripheral surface of the cylinder 31 is formed in a straight shape. In addition, the internal diameter of the 3rd hollow part 31c is the same as the internal diameter of the part (boundary part with the 3rd hollow part 31c) with the smallest opening area of the 2nd hollow part 31b, or it is smaller than it.

  The second hollow portion 31b and the third hollow portion 31c are filled with oil. Silicon oil or the like is used as the oil. By changing the viscosity of the oil, the braking characteristics can be finely adjusted. As shown in FIG. 5, the second hollow portion 31b and the third hollow portion 31c in the present embodiment correspond to the first buffer region R1 and the second buffer region R2 constituting the present invention, respectively. .

  As shown in FIG. 6, the piston 32 includes a main body portion 32a and a shaft portion 32b. The main body portion 32a has an outer diameter that is smaller than the inner diameter of the third hollow portion 31c. An oil passage 32c penetrating in the axial direction is formed in the main body portion 32a. The shaft portion 32b has an outer diameter smaller than the outer diameter of the main body portion 32a, and is formed integrally with the main body portion 32a. The shaft portion 32b has a portion (hereinafter referred to as “projecting portion”) 32d that projects outward from the outer peripheral surface thereof.

  A valve body 34 is attached to the piston 32. The valve body 34 has a hole portion 34a through which the shaft portion 32b of the piston 32 is inserted, and a part of the shaft portion 32b existing between the main body portion 32a and the overhanging portion 32d has play in the axial direction. Provided.

  Here, the hole 34a of the valve body 34 has an inner diameter larger than a part of the outer diameter of the shaft portion 32b, but the inner diameter is smaller than the outer diameter of the protruding portion 32d. Therefore, the valve body 34 is made of an elastic body that can expand the size of the hole portion 34a so that the shaft portion 32b can be inserted into the hole portion 34a.

  Specifically, the valve body 34 is made of rubber, resin, or the like, and when the protruding portion 32d is inserted into the hole portion 34a, the size of the hole portion 34a is expanded by applying an external force to the valve body 34. . When the protruding portion 32d passes through the hole 34a, the valve body 34 returns to its original shape due to its elasticity, and the expanded hole 34a contracts accordingly. Since the inner diameter of the hole portion 34a is set smaller than the outer diameter of the overhang portion 32d, the valve body 34 supported by a part of the shaft portion 32b is detached from the shaft portion 32b by the overhang portion 32d. Is prevented.

  Thus, according to the present embodiment, the overhang portion 32d functions as a stopper that prevents the valve body 34 from falling off, and thus functions as a stopper that is formed separately from the piston as in a conventional shock absorber. The member to do becomes unnecessary. In addition, there is no risk of accidents such as forgetting to attach a member functioning as a stopper or dropping off.

  The piston 32 is provided so as to move in the second hollow portion 31b and the third hollow portion 31c formed in the cylinder 31. That is, as shown in FIG. 5, in the present embodiment, the range L in which the piston 32 can move extends not only to the second hollow portion 31b but also to the third hollow portion 31c. In the present invention, the “range in which the piston can move” refers to a range in which the hydraulic resistance is effectively generated by the movement of the piston 32 in the direction of exerting the braking force.

  In this embodiment, as shown in FIGS. 4 and 5, there are springs that return the piston rod 33 to the original state in the second hollow portion 31b and the third hollow portion 31c in which the piston 32 is movably provided. do not do. For this reason, the 3rd hollow part 31c can accept | permit the movement to the further braking-force display direction of the piston 32 via the 2nd hollow part 31b, and the piston 32 moves to the braking-force display direction in it. Thus, it functions as a buffer region for generating hydraulic resistance.

  In this regard, for example, in the shock absorber disclosed in Japanese Patent Application Laid-Open No. 2000-227134, in addition to the buffer region formed by providing a small hole (orifice) in the peripheral wall of the inner tube, The inner peripheral surface of the inner tube has a hollow region formed in a straight shape. However, this hollow region functions only as a space for accommodating a spring that returns the piston rod to its original state, which is compressed by moving the piston in the direction of exerting the braking force.

  As described above, some of the conventional shock absorbers have the “hollow region” as described above, but such a hollow region simply holds a spring for returning the piston rod to its original state. Alternatively, it functions only as a space to be accommodated, and as in the third hollow portion 31c in the present embodiment, the piston 32 is allowed to move further in the direction of exerting the braking force and functions as a buffer region. Absent.

  The piston rod 33 is inserted through a hole formed in the lid 35 that closes the opening of the cylinder 31, and one end protruding from the cylinder 31 is coupled to the coupling portion 53. A piston 32 is coupled to the other end of the piston rod 33 disposed in the cylinder 31.

  As shown in FIGS. 6 and 7, the piston rod 33 is also inserted through a hole 36 a that penetrates the movable member 36 in the axial direction. In the first hollow portion 31a formed in the cylinder 31, the movable member 36 is formed on the outer peripheral surface of the piston rod 33 and the inner peripheral surface of the cylinder 31 (inner peripheral surface of the first hollow portion 31a). It is provided so that it can move along the piston rod 33 while sliding the outer peripheral surface.

  By providing the movable member 36 in the cylinder 31, between the outer peripheral surface of the movable member 36 and the inner peripheral surface of the cylinder 31 and between the inner peripheral surface of the movable member 36 and the outer peripheral surface of the piston rod 33, Each gap is formed. As shown in FIGS. 6 and 7, the movable member 36 is provided with seal members 37a and 37b for sealing these gaps. In addition, an air vent groove 36 b formed along the axial direction is provided on the inner peripheral surface of the movable member 36.

  As shown in FIG. 4, the first hollow portion 31 a is also provided with a spring 38 that applies a preload to the movable member 36. The spring 38 is a compression spring, and both ends thereof are supported by a lid 35 and a movable member 36 that close the opening of the cylinder 31, respectively.

  The shock absorber 30 in the present embodiment is assembled as follows. First, the oil is injected from the opening of the cylinder 31 into the second hollow portion 31b and the third hollow portion 31c before putting the components such as the piston 32 into the cylinder 31. Therefore, according to the present embodiment, it is not necessary to separately provide an inlet for injecting oil and a plug for closing the oil, and the structure of the cylinder 31 can be simplified. As a result, the cost for processing and assembly is reduced. It becomes possible to make it.

  Next, the piston 32 coupled with the piston rod 33 and attached with the valve body 34 is inserted into the cylinder 31 filled with oil, and the movable member 36 is disposed in the first hollow portion 31a. .

  As shown in FIGS. 4 and 6, the movable member 36 has the first hollow portion 31a and the first hollow portion 31a in order to prevent air that causes a reduction in braking characteristics from remaining in the buffer regions R1 and R2 that generate hydraulic resistance. The end surface is brought into contact with the wall surface existing at the boundary of the second hollow portion 31b and assembled.

  When the movable member 36 is assembled, only the seal member 37a that seals the gap between the movable member 36 and the cylinder 31 among the seal members 37a and 37b provided at two positions is attached to the movable member 36 in advance. The gap between the movable member 36 and the cylinder 31 is sealed by a seal member 37a, and the gap between the movable member 36 and the piston rod 33 is very small. Therefore, when the movable member 36 is disposed at a predetermined position, the movable member 36 36 receives the resistance of the air remaining in the first hollow portion 31a, but the movable member 36 is formed with an air vent groove 36b, and air is released to the outside through the groove 36b. The movable member 36 can be easily disposed at a predetermined position. Further, since the air remaining in the first hollow portion 31a is discharged to the outside using the groove 36b, the oil filling rate is improved, so that the braking characteristic can be improved and stabilized.

  The seal member 37b that seals the gap between the movable member 36 and the piston rod 33 is assembled after the movable member 36 is disposed at a predetermined position. Since the air release groove 36b is also cut off from the outside by the seal member 37b, the second hollow portion 31b and the third hollow portion 31c are sealed so that the oil filled therein does not leak out. .

  Next, a spring 38 for applying a preload to the movable member 36 is loaded into the first hollow portion 31a, and then the lid 35 is attached to the opening of the cylinder 31 with the spring 38 being slightly compressed.

  As shown in FIG. 8, the drawer guides according to the present embodiment are arranged and used one by one on both sides of the drawer 70.

  When the drawer 70 drawn out to the open position is stored in the closed position, the movable rail 20 slides in the closing direction along the guide rail 10. When the movable rail 20 slides to a certain point, the protruding piece 21 attached to the movable rail 20 collides with the receiving tool 50. Thereby, the receiving tool 50 is released from the locked state, and the recess 52 of the receiving tool 50 is engaged with the protruding piece 21.

  The receptacle 50 released from the locked state moves in the closing direction by the force of the spring 60. Thereby, the movable rail 20 engaged with the receiving member 50 is pulled in through the protruding piece 21 until reaching the end point in the closing direction, and as a result, the drawer 70 is stored in the closed position.

  The shock generated when the drawer 70 is stored in the closed position is absorbed by the shock absorber 30. That is, as the receiver 50 moves in the closing direction, the coupling portion 53 provided in the receptacle 50 also moves in the same direction, so that the piston rod 33 coupled to the coupling portion 53 moves backward, and the cylinder It is pushed into 31.

  As the piston rod 33 moves backward, the piston 32 first moves the second hollow portion 31b in the braking force exerting direction. At this time, the valve body 34 attached to the piston 32 moves along the shaft portion 32b of the piston 32 by receiving the pressure of the oil, and is in close contact with the main body portion 32a of the piston 32 to be formed in the piston 32. The oil passage 32c is blocked. For this reason, the oil moves to the back side of the piston 32 through the gap between the outer peripheral surface of the piston 32 and the inner peripheral surface of the second hollow portion 31b.

  Since the inner peripheral surface of the second hollow portion 31b is formed in a tapered shape, the gap through which oil can pass gradually decreases as the piston 32 moves. Therefore, the hydraulic resistance gradually increases as the piston 32 moves in the braking force exerting direction.

  Due to this action, the drawer guide can suppress the repulsive force of the shock absorber 30 even when the load applied to the shock absorber 30 is small (in the case of a light load), so that the movable rail 20 can be moved smoothly. Therefore, according to this drawer guide, even if nothing is accommodated in the drawer 70, it can be smoothly closed.

  In the case of a light load, there may be a case where all the impact is absorbed before the piston 32 enters the third hollow portion 31c via the second hollow portion 31b. Due to the force of the spring 60 that pulls in the closing direction, the movable rail 20 is pulled up to the end in the closing direction, and the piston 32 is also in the third hollow portion 31c (the limit position where the piston 32 can move). It moves in the direction of the braking force until it reaches. Therefore, according to this drawer guide, even if nothing is accommodated in the drawer 70, the drawer 70 can be closed until it reaches the closed position without stagnation halfway.

  Since the inner peripheral surface of the third hollow portion 31c is formed in a straight shape, a gap formed between the piston 32 and the cylinder 31 when the piston 32 moves in the braking force exerting direction is not formed. It is constant. Since the shock absorber 30 in the present embodiment has the third hollow portion 31c functioning as the second buffer region R2 in addition to the second hollow portion 31b functioning as the first buffer region R1, the shock absorber 30 When the applied load is large (in the case of heavy load), even if the first buffer region R1 cannot sufficiently absorb the shock, the second buffer region R2 can completely absorb the shock. . Therefore, according to this drawer guide, even if an object is stored in the drawer 70 and the weight increases, the drawer 70 can be quietly stored in the closed position without generating an impact. .

  Further, the second buffer region R2 not only compensates for the shock absorbing capability of the first buffer region R1 in order to absorb a large shock, but also by the action of the spring 60 that pulls the movable rail 20 in the closing direction. It also serves to prevent 20 from sliding rapidly in the closing direction. Therefore, according to this drawer guide, regardless of whether or not an object is stored in the drawer 70, the drawer 70 can be closed at a slow speed.

  Oil corresponding to the volume increase of the piston rod 33 that has entered the cylinder 31 flows into the first hollow portion 31a. As shown in FIG. 9, the movable member 36 moves along the piston rod 33 while compressing the spring 38 by receiving the pressure of the oil flowing into the first hollow portion 31 a. Since the movable member 36 is preloaded by the spring 38, air can be prevented from being mixed when the movable member 36 moves. The oil that has flowed into the first hollow portion 31 a is stored in a space created by the movement of the movable member 36. The spring 38 for applying a preload to the movable member 36 is less likely to have a lower restoring force than a foam or the like and has excellent durability. Therefore, in a usage mode in which oil is accumulated for a long time like a drawer. Even oil can be accumulated stably.

  According to the drawer guide according to the present embodiment, the piston rod 33 of the shock absorber 30 moves forward and backward by the movement of the coupling portion 53, and the spring that returns the piston rod 33 to the original state is provided on the shock absorber 30 itself. Not provided. For this reason, when the movable rail 20 reaches the end in the closing direction and the piston rod 33 is pushed into the cylinder 31, the piston rod 33 is pushed into the cylinder 31 unless the coupling portion 53 is moved in the opening direction. As a result, the phenomenon that the movable rail 20 reverts back in the opening direction cannot occur. Therefore, according to this drawer guide, even when the hydraulic resistance of the shock absorber 30 is increased, the closed drawer 70 is not pushed back in the opening direction.

  On the other hand, when the drawer 70 stored in the closed position is pulled out to the open position, the movable rail 20 slides in the opening direction along the guide rail 10. Along with this, the receiver 50 moves in the opening direction, and the coupling portion 53 provided in the receiver 50 also moves in the same direction. Thereby, the piston rod 33 of the shock absorber 30 can be moved forward.

  As the piston rod 33 advances, the piston 32 can return to the original position. At this time, the valve body 34 attached to the piston 32 moves along the shaft portion 32 b of the piston 32 by receiving the pressure of the oil, and is separated from the main body portion 32 a of the piston 32 to be formed in the piston 32. The oil passage 32c is opened. Therefore, the oil passes through not only the gap between the outer peripheral surface of the piston 32 and the inner peripheral surfaces of the second hollow portion 31b and the third hollow portion 31c, but also through the oil passage 32c formed in the piston 32. 32 will move to the front side. Accordingly, the resistance of the oil generated at this time is small. As a result, the drawer 70 can be pulled out with a small force.

  In addition, since the volume of the piston rod 33 that has entered the cylinder 31 decreases as the piston rod 33 moves forward, the oil stored in the first hollow portion 31a also flows back to the second hollow portion 31b. Correspondingly, the movable member 36 also moves in the direction of returning to the original position by the force of the spring 38, and works to promote oil recirculation.

  When the movable rail 20 slides to a certain point, the engagement state between the protruding piece 21 attached to the movable rail 20 and the concave portion 52 of the receiving member 50 is released. Thereby, one protrusion 51b of the receiver 50 moves from the parallel part 41a of the guide groove 41 to the orthogonal part 41b of the guide groove 41, and the receiver 50 is locked so that it cannot move in the closing direction.

  The force of the spring 60 that pulls the movable rail 20 in the closing direction is not exerted on the movable rail 20 until the end of the opening direction is reached after the engagement state between the protruding piece 21 and the receiving member 50 is released. The movable rail 20 can slide and receive almost no resistance. Therefore, the drawer 70 can be opened with a very small force.

  FIG. 10 is a view showing the internal structure of the shock absorber 30 used in the drawer guide according to another embodiment of the present invention. As shown in this figure, in the drawer guide according to this embodiment, the shock absorber 30 has a groove extending on the inner peripheral surface of the cylinder 31 between the first buffer region R1 and the second buffer region R2. This differs from the above-described drawer guide according to the first embodiment.

  The groove 39 opens at least in the second hollow portion 31b that functions as the first buffer region R1, and extends along the axial direction on the inner peripheral surface of the third hollow portion 31c that functions as the second buffer region R2. As long as it is formed, it is preferable that it is formed along the axial direction on the inner peripheral surfaces of the second hollow portion 31b and the third hollow portion 31c as shown in FIG. The braking characteristic can be adjusted by changing the width or depth of the groove 39.

  By forming such a groove 39, oil can flow through the cylinder 31 through the groove 39. In particular, when the gap between the outer peripheral surface of the piston 32 and the inner peripheral surface of the third hollow portion 31c is set to be extremely small in order to generate a large hydraulic resistance, the shock absorber against a sudden load. 30 may generate a strong repulsive force, but by providing this groove, the oil compressed by the piston 32 in the third hollow portion 31c flows to the second hollow portion 31b also using this groove 39. Therefore, strong repulsion of the shock absorber 30 against a sudden load can be suppressed.

  Therefore, according to the drawer guide according to the present embodiment, even when a sudden load is applied to the shock absorber 30, strong repulsion of the shock absorber 30 is suppressed, and the drawer is smoothly and slowly moved. It can be closed.

It is a schematic perspective view which shows the drawer guide tool which concerns on one Example of this invention. It is a figure which shows the internal structure of a casing. It is a figure which shows the internal structure of a casing. It is a figure which shows the internal structure of a shock absorber. It is a figure which shows the internal structure of a shock absorber. It is the A section enlarged view of FIG. FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. It is a figure which shows an example of the use condition of a drawer guide. It is a figure which shows the internal structure of a shock absorber. It is a figure which shows the internal structure of the shock absorber used for the drawer guide tool which concerns on the other Example of this invention. It is AA section sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Guide rail 20 Movable rail 21 Protruding piece 30 Shock absorber 31 Cylinder 31a 1st hollow part 31b 2nd hollow part 31c 3rd hollow part 32 Piston 32a Main body part 32b Shaft part 32c Oil passage 32d Overhang part 33 Piston rod 34 Valve Body 34a Hole 35 Lid 36 Movable member 37a, 37b Seal member 38 Spring 39 Groove 40 Casing 41 Guide groove 41a Parallel part 41b Orthogonal part 50 Receptacle 51a, 51b Protrusion 52 Concave part 53 Coupling part 60 Spring

Claims (14)

A movable rail that moves along the guide rail;
A coupling portion provided to move in the same direction as the movable rail by the movement of the movable rail;
The piston rod has a cylinder, a piston, and a piston rod. One end of the piston rod protruding from the cylinder is coupled to the coupling portion, and the other end of the piston rod disposed in the cylinder has the piston And a shock absorber that brakes the movement of the movable rail in the closing direction by a hydraulic resistance generated when the piston rod is retracted and pushed into the cylinder by the movement of the connecting portion in the closing direction. Prepared,
The spring for returning the piston rod to the original state is eliminated by advancing the piston rod by the movement of the coupling portion in the opening direction and returning the piston rod to the state before being pushed into the cylinder. Drawer guide. Wherein the shock absorber, the outer peripheral surface and the inner peripheral surface of the cylinder of the piston rod, while sliding the inner peripheral surface and outer peripheral surface, respectively, a movable member that moves along said piston rod, a movable member claims, characterized by comprising a seal member for sealing the gap formed between the gap and the movable member formed between the cylinder and the piston rod, and a spring providing a preload to said movable member Item 10. The drawer guide according to Item 1.   The drawer guide according to claim 2, wherein the movable member has a groove for bleeding air. And having a spring to pull the movable rail in the closing direction, the shock absorber, the piston is movable range, the said piston can be increased gradually hydraulic resistance according to moves to the braking force exerted direction a first buffer area, to allow movement of the further braking force exerted direction of the piston via the buffer area of the first, at least the piston is movable range, so that the inner diameter of the cylinder is the same The drawer guide according to any one of claims 1 to 3, further comprising a second buffer region in which an inner peripheral surface of the cylinder is formed in a straight shape. It said first buffer area, the inside diameter of the cylinder is such that gradually decreases toward the braking force exerted direction, the inner circumferential surface of the cylinder is characterized by being composed by being formed in a tapered shape The drawer guide according to claim 4. 6. The drawer guide according to claim 4, further comprising a groove extending between the first buffer region and the second buffer region on an inner peripheral surface of the cylinder. Said piston has a passage of oil, the shock absorber is supported by a shaft portion formed in the piston, by moving along the shaft portion, have a valve body for opening and closing the passage, the The valve body is made of an elastic body capable of expanding the size of the hole portion through which the shaft portion is inserted, and is prevented from falling off from the shaft portion by a portion protruding to the outside of the shaft portion. The drawer guide according to any one of claims 1 to 6. A movable rail moves along the guide rails, the movement of the movable rail, a shock absorber that is used in the drawer guide member having a coupling portion provided so as to move in the same direction as the movable rail ,
The piston rod has a cylinder, a piston, and a piston rod. One end of the piston rod protruding from the cylinder is coupled to the coupling portion, and the other end of the piston rod disposed in the cylinder has the piston And the movement of the movable rail in the closing direction is braked by the hydraulic resistance generated when the piston rod is retracted by the movement of the connecting portion in the closing direction and pushed into the cylinder.
The spring for returning the piston rod to the original state is eliminated by advancing the piston rod by the movement of the coupling portion in the opening direction and returning the piston rod to the state before being pushed into the cylinder. Shock absorber. The outer peripheral surface and the inner peripheral surface of the cylinder of the piston rod, while sliding the inner peripheral surface and outer peripheral surface, respectively, a movable member which moves along the piston rod, between the and the movable member cylinder The seal member which seals the clearance gap formed and the clearance gap formed between this movable member and the said piston rod, and the spring which provides a preload to the said movable member are comprised. shock absorber.   The shock absorber according to claim 9, wherein the movable member has an air vent groove. Said piston movable range, wherein the piston and the first buffer area which can be enhanced gradually hydraulic resistance according to moves to the braking force exerted direction, of the piston via the buffer area of the first allow movement of the further braking force exerted direction, at least the piston is movable range, the inner diameter of the cylinder to be equal, the second inner peripheral surface of the cylinder is formed in a straight shape The shock absorber according to any one of claims 8 to 10, wherein the shock absorber exhibits a braking force against a force of a spring that pulls the movable rail in a closing direction. It said first buffer area, the inside diameter of the cylinder is such that gradually decreases toward the braking force exerted direction, the inner circumferential surface of the cylinder is characterized by being composed by being formed in a tapered shape The shock absorber according to claim 11. An inner circumferential surface of the cylinder, shock absorber of claim 11 or 12, characterized in that there grooves spanning between said first buffer region and the second buffer area. Said piston has a passage of the oil, is supported by a shaft portion formed in the piston, by moving along the shaft portion, and having a valve element for opening and closing the passage, the valve body, the 9. The shaft is made of an elastic body capable of expanding a size of a hole portion through which the shaft portion is inserted, and is prevented from falling off from the shaft portion by a portion protruding to the outside of the shaft portion. The shock absorber according to any one of ˜13.

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